mesa update 11 july 2011

1 files changed, 1949 insertions, 1935 deletions

diff --git a/mesalib/src/mesa/main/image.c b/mesalib/src/mesa/main/image.c
index a5cd5ac03..37127dcb7 100644
--- a/mesalib/src/mesa/main/image.c
+++ b/mesalib/src/mesa/main/image.c
@@ -1,1935 +1,1949 @@
-/*

- * Mesa 3-D graphics library

- * Version:  7.5

- *

- * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

- * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.

- *

- * Permission is hereby granted, free of charge, to any person obtaining a

- * copy of this software and associated documentation files (the "Software"),

- * to deal in the Software without restriction, including without limitation

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * and/or sell copies of the Software, and to permit persons to whom the

- * Software is furnished to do so, subject to the following conditions:

- *

- * The above copyright notice and this permission notice shall be included

- * in all copies or substantial portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

- */

-

-

-/**

- * \file image.c

- * Image handling.

- */

-

-

-#include "glheader.h"

-#include "colormac.h"

-#include "image.h"

-#include "imports.h"

-#include "macros.h"

-#include "mfeatures.h"

-#include "mtypes.h"

-

-

-/**

- * NOTE:

- * Normally, BYTE_TO_FLOAT(0) returns 0.00392  That causes problems when

- * we later convert the float to a packed integer value (such as for

- * GL_RGB5_A1) because we'll wind up with a non-zero value.

- *

- * We redefine the macros here so zero is handled correctly.

- */

-#undef BYTE_TO_FLOAT

-#define BYTE_TO_FLOAT(B)    ((B) == 0 ? 0.0F : ((2.0F * (B) + 1.0F) * (1.0F/255.0F)))

-

-#undef SHORT_TO_FLOAT

-#define SHORT_TO_FLOAT(S)   ((S) == 0 ? 0.0F : ((2.0F * (S) + 1.0F) * (1.0F/65535.0F)))

-

-

-

-/** Compute ceiling of integer quotient of A divided by B. */

-#define CEILING( A, B )  ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )

-

-

-/**

- * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.

- */

-GLboolean

-_mesa_type_is_packed(GLenum type)

-{

-   switch (type) {

-   case GL_UNSIGNED_BYTE_3_3_2:

-   case GL_UNSIGNED_BYTE_2_3_3_REV:

-   case MESA_UNSIGNED_BYTE_4_4:

-   case GL_UNSIGNED_SHORT_5_6_5:

-   case GL_UNSIGNED_SHORT_5_6_5_REV:

-   case GL_UNSIGNED_SHORT_4_4_4_4:

-   case GL_UNSIGNED_SHORT_4_4_4_4_REV:

-   case GL_UNSIGNED_SHORT_5_5_5_1:

-   case GL_UNSIGNED_SHORT_1_5_5_5_REV:

-   case GL_UNSIGNED_INT_8_8_8_8:

-   case GL_UNSIGNED_INT_8_8_8_8_REV:

-   case GL_UNSIGNED_INT_10_10_10_2:

-   case GL_UNSIGNED_INT_2_10_10_10_REV:

-   case GL_UNSIGNED_SHORT_8_8_MESA:

-   case GL_UNSIGNED_SHORT_8_8_REV_MESA:

-   case GL_UNSIGNED_INT_24_8_EXT:

-   case GL_UNSIGNED_INT_5_9_9_9_REV:

-   case GL_UNSIGNED_INT_10F_11F_11F_REV:

-      return GL_TRUE;

-   }

-

-   return GL_FALSE;

-}

-

-

-

-/**

- * Flip the order of the 2 bytes in each word in the given array.

- *

- * \param p array.

- * \param n number of words.

- */

-void

-_mesa_swap2( GLushort *p, GLuint n )

-{

-   GLuint i;

-   for (i = 0; i < n; i++) {

-      p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);

-   }

-}

-

-

-

-/*

- * Flip the order of the 4 bytes in each word in the given array.

- */

-void

-_mesa_swap4( GLuint *p, GLuint n )

-{

-   GLuint i, a, b;

-   for (i = 0; i < n; i++) {

-      b = p[i];

-      a =  (b >> 24)

-	| ((b >> 8) & 0xff00)

-	| ((b << 8) & 0xff0000)

-	| ((b << 24) & 0xff000000);

-      p[i] = a;

-   }

-}

-

-

-/**

- * Get the size of a GL data type.

- *

- * \param type GL data type.

- *

- * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1

- * if an invalid type enum.

- */

-GLint

-_mesa_sizeof_type( GLenum type )

-{

-   switch (type) {

-      case GL_BITMAP:

-	 return 0;

-      case GL_UNSIGNED_BYTE:

-         return sizeof(GLubyte);

-      case GL_BYTE:

-	 return sizeof(GLbyte);

-      case GL_UNSIGNED_SHORT:

-	 return sizeof(GLushort);

-      case GL_SHORT:

-	 return sizeof(GLshort);

-      case GL_UNSIGNED_INT:

-	 return sizeof(GLuint);

-      case GL_INT:

-	 return sizeof(GLint);

-      case GL_FLOAT:

-	 return sizeof(GLfloat);

-      case GL_DOUBLE:

-	 return sizeof(GLdouble);

-      case GL_HALF_FLOAT_ARB:

-	 return sizeof(GLhalfARB);

-      case GL_FIXED:

-	 return sizeof(GLfixed);

-      default:

-         return -1;

-   }

-}

-

-

-/**

- * Same as _mesa_sizeof_type() but also accepting the packed pixel

- * format data types.

- */

-GLint

-_mesa_sizeof_packed_type( GLenum type )

-{

-   switch (type) {

-      case GL_BITMAP:

-	 return 0;

-      case GL_UNSIGNED_BYTE:

-         return sizeof(GLubyte);

-      case GL_BYTE:

-	 return sizeof(GLbyte);

-      case GL_UNSIGNED_SHORT:

-	 return sizeof(GLushort);

-      case GL_SHORT:

-	 return sizeof(GLshort);

-      case GL_UNSIGNED_INT:

-	 return sizeof(GLuint);

-      case GL_INT:

-	 return sizeof(GLint);

-      case GL_HALF_FLOAT_ARB:

-	 return sizeof(GLhalfARB);

-      case GL_FLOAT:

-	 return sizeof(GLfloat);

-      case GL_UNSIGNED_BYTE_3_3_2:

-         return sizeof(GLubyte);

-      case GL_UNSIGNED_BYTE_2_3_3_REV:

-         return sizeof(GLubyte);

-      case MESA_UNSIGNED_BYTE_4_4:

-         return sizeof(GLubyte);

-      case GL_UNSIGNED_SHORT_5_6_5:

-         return sizeof(GLushort);

-      case GL_UNSIGNED_SHORT_5_6_5_REV:

-         return sizeof(GLushort);

-      case GL_UNSIGNED_SHORT_4_4_4_4:

-         return sizeof(GLushort);

-      case GL_UNSIGNED_SHORT_4_4_4_4_REV:

-         return sizeof(GLushort);

-      case GL_UNSIGNED_SHORT_5_5_5_1:

-         return sizeof(GLushort);

-      case GL_UNSIGNED_SHORT_1_5_5_5_REV:

-         return sizeof(GLushort);

-      case GL_UNSIGNED_INT_8_8_8_8:

-         return sizeof(GLuint);

-      case GL_UNSIGNED_INT_8_8_8_8_REV:

-         return sizeof(GLuint);

-      case GL_UNSIGNED_INT_10_10_10_2:

-         return sizeof(GLuint);

-      case GL_UNSIGNED_INT_2_10_10_10_REV:

-         return sizeof(GLuint);

-      case GL_UNSIGNED_SHORT_8_8_MESA:

-      case GL_UNSIGNED_SHORT_8_8_REV_MESA:

-         return sizeof(GLushort);      

-      case GL_UNSIGNED_INT_24_8_EXT:

-         return sizeof(GLuint);

-      case GL_UNSIGNED_INT_5_9_9_9_REV:

-         return sizeof(GLuint);

-      case GL_UNSIGNED_INT_10F_11F_11F_REV:

-         return sizeof(GLuint);

-      default:

-         return -1;

-   }

-}

-

-

-/**

- * Get the number of components in a pixel format.

- *

- * \param format pixel format.

- *

- * \return the number of components in the given format, or -1 if a bad format.

- */

-GLint

-_mesa_components_in_format( GLenum format )

-{

-   switch (format) {

-      case GL_COLOR_INDEX:

-      case GL_COLOR_INDEX1_EXT:

-      case GL_COLOR_INDEX2_EXT:

-      case GL_COLOR_INDEX4_EXT:

-      case GL_COLOR_INDEX8_EXT:

-      case GL_COLOR_INDEX12_EXT:

-      case GL_COLOR_INDEX16_EXT:

-      case GL_STENCIL_INDEX:

-      case GL_DEPTH_COMPONENT:

-      case GL_RED:

-      case GL_RED_INTEGER_EXT:

-      case GL_GREEN:

-      case GL_GREEN_INTEGER_EXT:

-      case GL_BLUE:

-      case GL_BLUE_INTEGER_EXT:

-      case GL_ALPHA:

-      case GL_ALPHA_INTEGER_EXT:

-      case GL_LUMINANCE:

-      case GL_LUMINANCE_INTEGER_EXT:

-      case GL_INTENSITY:

-         return 1;

-      case GL_LUMINANCE_ALPHA:

-      case GL_LUMINANCE_ALPHA_INTEGER_EXT:

-      case GL_RG:

-	 return 2;

-      case GL_RGB:

-      case GL_RGB_INTEGER_EXT:

-	 return 3;

-      case GL_RGBA:

-      case GL_RGBA_INTEGER_EXT:

-	 return 4;

-      case GL_BGR:

-	 return 3;

-      case GL_BGRA:

-	 return 4;

-      case GL_ABGR_EXT:

-         return 4;

-      case GL_YCBCR_MESA:

-         return 2;

-      case GL_DEPTH_STENCIL_EXT:

-         return 2;

-      case GL_DUDV_ATI:

-      case GL_DU8DV8_ATI:

-         return 2;

-      default:

-         return -1;

-   }

-}

-

-

-/**

- * Get the bytes per pixel of pixel format type pair.

- *

- * \param format pixel format.

- * \param type pixel type.

- *

- * \return bytes per pixel, or -1 if a bad format or type was given.

- */

-GLint

-_mesa_bytes_per_pixel( GLenum format, GLenum type )

-{

-   GLint comps = _mesa_components_in_format( format );

-   if (comps < 0)

-      return -1;

-

-   switch (type) {

-      case GL_BITMAP:

-         return 0;  /* special case */

-      case GL_BYTE:

-      case GL_UNSIGNED_BYTE:

-         return comps * sizeof(GLubyte);

-      case GL_SHORT:

-      case GL_UNSIGNED_SHORT:

-         return comps * sizeof(GLshort);

-      case GL_INT:

-      case GL_UNSIGNED_INT:

-         return comps * sizeof(GLint);

-      case GL_FLOAT:

-         return comps * sizeof(GLfloat);

-      case GL_HALF_FLOAT_ARB:

-         return comps * sizeof(GLhalfARB);

-      case GL_UNSIGNED_BYTE_3_3_2:

-      case GL_UNSIGNED_BYTE_2_3_3_REV:

-         if (format == GL_RGB || format == GL_BGR ||

-             format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)

-            return sizeof(GLubyte);

-         else

-            return -1;  /* error */

-      case GL_UNSIGNED_SHORT_5_6_5:

-      case GL_UNSIGNED_SHORT_5_6_5_REV:

-         if (format == GL_RGB || format == GL_BGR ||

-             format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)

-            return sizeof(GLushort);

-         else

-            return -1;  /* error */

-      case GL_UNSIGNED_SHORT_4_4_4_4:

-      case GL_UNSIGNED_SHORT_4_4_4_4_REV:

-      case GL_UNSIGNED_SHORT_5_5_5_1:

-      case GL_UNSIGNED_SHORT_1_5_5_5_REV:

-         if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||

-             format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)

-            return sizeof(GLushort);

-         else

-            return -1;

-      case GL_UNSIGNED_INT_8_8_8_8:

-      case GL_UNSIGNED_INT_8_8_8_8_REV:

-      case GL_UNSIGNED_INT_10_10_10_2:

-      case GL_UNSIGNED_INT_2_10_10_10_REV:

-         if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||

-             format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)

-            return sizeof(GLuint);

-         else

-            return -1;

-      case GL_UNSIGNED_SHORT_8_8_MESA:

-      case GL_UNSIGNED_SHORT_8_8_REV_MESA:

-         if (format == GL_YCBCR_MESA)

-            return sizeof(GLushort);

-         else

-            return -1;

-      case GL_UNSIGNED_INT_24_8_EXT:

-         if (format == GL_DEPTH_STENCIL_EXT)

-            return sizeof(GLuint);

-         else

-            return -1;

-      case GL_UNSIGNED_INT_5_9_9_9_REV:

-         if (format == GL_RGB)

-            return sizeof(GLuint);

-         else

-            return -1;

-      case GL_UNSIGNED_INT_10F_11F_11F_REV:

-         if (format == GL_RGB)

-            return sizeof(GLuint);

-         else

-            return -1;

-      default:

-         return -1;

-   }

-}

-

-

-/**

- * Test for a legal pixel format and type.

- *

- * \param format pixel format.

- * \param type pixel type.

- *

- * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE

- * otherwise.

- */

-GLboolean

-_mesa_is_legal_format_and_type(const struct gl_context *ctx,

-                               GLenum format, GLenum type)

-{

-   switch (format) {

-      case GL_COLOR_INDEX:

-      case GL_STENCIL_INDEX:

-         switch (type) {

-            case GL_BITMAP:

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-               return GL_TRUE;

-            case GL_HALF_FLOAT_ARB:

-               return ctx->Extensions.ARB_half_float_pixel;

-            default:

-               return GL_FALSE;

-         }

-      case GL_RED:

-      case GL_GREEN:

-      case GL_BLUE:

-      case GL_ALPHA:

-#if 0 /* not legal!  see table 3.6 of the 1.5 spec */

-      case GL_INTENSITY:

-#endif

-      case GL_LUMINANCE:

-      case GL_LUMINANCE_ALPHA:

-      case GL_DEPTH_COMPONENT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-               return GL_TRUE;

-            case GL_HALF_FLOAT_ARB:

-               return ctx->Extensions.ARB_half_float_pixel;

-            default:

-               return GL_FALSE;

-         }

-      case GL_RG:

-	 if (!ctx->Extensions.ARB_texture_rg)

-	    return GL_FALSE;

-

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-               return GL_TRUE;

-            case GL_HALF_FLOAT_ARB:

-               return ctx->Extensions.ARB_half_float_pixel;

-            default:

-               return GL_FALSE;

-         }

-      case GL_RGB:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-            case GL_UNSIGNED_BYTE_3_3_2:

-            case GL_UNSIGNED_BYTE_2_3_3_REV:

-            case GL_UNSIGNED_SHORT_5_6_5:

-            case GL_UNSIGNED_SHORT_5_6_5_REV:

-               return GL_TRUE;

-            case GL_HALF_FLOAT_ARB:

-               return ctx->Extensions.ARB_half_float_pixel;

-            case GL_UNSIGNED_INT_5_9_9_9_REV:

-               return ctx->Extensions.EXT_texture_shared_exponent;

-            case GL_UNSIGNED_INT_10F_11F_11F_REV:

-               return ctx->Extensions.EXT_packed_float;

-            default:

-               return GL_FALSE;

-         }

-      case GL_BGR:

-         switch (type) {

-            /* NOTE: no packed types are supported with BGR.  That's

-             * intentional, according to the GL spec.

-             */

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-               return GL_TRUE;

-            case GL_HALF_FLOAT_ARB:

-               return ctx->Extensions.ARB_half_float_pixel;

-            default:

-               return GL_FALSE;

-         }

-      case GL_RGBA:

-      case GL_BGRA:

-      case GL_ABGR_EXT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-            case GL_UNSIGNED_SHORT_4_4_4_4:

-            case GL_UNSIGNED_SHORT_4_4_4_4_REV:

-            case GL_UNSIGNED_SHORT_5_5_5_1:

-            case GL_UNSIGNED_SHORT_1_5_5_5_REV:

-            case GL_UNSIGNED_INT_8_8_8_8:

-            case GL_UNSIGNED_INT_8_8_8_8_REV:

-            case GL_UNSIGNED_INT_10_10_10_2:

-            case GL_UNSIGNED_INT_2_10_10_10_REV:

-               return GL_TRUE;

-            case GL_HALF_FLOAT_ARB:

-               return ctx->Extensions.ARB_half_float_pixel;

-            default:

-               return GL_FALSE;

-         }

-      case GL_YCBCR_MESA:

-         if (type == GL_UNSIGNED_SHORT_8_8_MESA ||

-             type == GL_UNSIGNED_SHORT_8_8_REV_MESA)

-            return GL_TRUE;

-         else

-            return GL_FALSE;

-      case GL_DEPTH_STENCIL_EXT:

-         if (ctx->Extensions.EXT_packed_depth_stencil

-             && type == GL_UNSIGNED_INT_24_8_EXT)

-            return GL_TRUE;

-         else

-            return GL_FALSE;

-      case GL_DUDV_ATI:

-      case GL_DU8DV8_ATI:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_FLOAT:

-               return GL_TRUE;

-            default:

-               return GL_FALSE;

-         }

-

-      /* integer-valued formats */

-      case GL_RED_INTEGER_EXT:

-      case GL_GREEN_INTEGER_EXT:

-      case GL_BLUE_INTEGER_EXT:

-      case GL_ALPHA_INTEGER_EXT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-               return ctx->Extensions.EXT_texture_integer;

-            default:

-               return GL_FALSE;

-         }

-

-      case GL_RGB_INTEGER_EXT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_UNSIGNED_BYTE_3_3_2:

-            case GL_UNSIGNED_BYTE_2_3_3_REV:

-            case GL_UNSIGNED_SHORT_5_6_5:

-            case GL_UNSIGNED_SHORT_5_6_5_REV:

-               return ctx->Extensions.EXT_texture_integer;

-            default:

-               return GL_FALSE;

-         }

-

-      case GL_BGR_INTEGER_EXT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            /* NOTE: no packed formats w/ BGR format */

-               return ctx->Extensions.EXT_texture_integer;

-            default:

-               return GL_FALSE;

-         }

-

-      case GL_RGBA_INTEGER_EXT:

-      case GL_BGRA_INTEGER_EXT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-            case GL_UNSIGNED_SHORT_4_4_4_4:

-            case GL_UNSIGNED_SHORT_4_4_4_4_REV:

-            case GL_UNSIGNED_SHORT_5_5_5_1:

-            case GL_UNSIGNED_SHORT_1_5_5_5_REV:

-            case GL_UNSIGNED_INT_8_8_8_8:

-            case GL_UNSIGNED_INT_8_8_8_8_REV:

-            case GL_UNSIGNED_INT_10_10_10_2:

-            case GL_UNSIGNED_INT_2_10_10_10_REV:

-               return ctx->Extensions.EXT_texture_integer;

-            default:

-               return GL_FALSE;

-         }

-

-      case GL_LUMINANCE_INTEGER_EXT:

-      case GL_LUMINANCE_ALPHA_INTEGER_EXT:

-         switch (type) {

-            case GL_BYTE:

-            case GL_UNSIGNED_BYTE:

-            case GL_SHORT:

-            case GL_UNSIGNED_SHORT:

-            case GL_INT:

-            case GL_UNSIGNED_INT:

-               return ctx->Extensions.EXT_texture_integer;

-            default:

-               return GL_FALSE;

-         }

-

-      default:

-         ; /* fall-through */

-   }

-   return GL_FALSE;

-}

-

-

-/**

- * Test if the given image format is a color/RGBA format (i.e., not color

- * index, depth, stencil, etc).

- * \param format  the image format value (may by an internal texture format)

- * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.

- */

-GLboolean

-_mesa_is_color_format(GLenum format)

-{

-   switch (format) {

-      case GL_RED:

-      case GL_GREEN:

-      case GL_BLUE:

-      case GL_ALPHA:

-      case GL_ALPHA4:

-      case GL_ALPHA8:

-      case GL_ALPHA12:

-      case GL_ALPHA16:

-      case 1:

-      case GL_LUMINANCE:

-      case GL_LUMINANCE4:

-      case GL_LUMINANCE8:

-      case GL_LUMINANCE12:

-      case GL_LUMINANCE16:

-      case 2:

-      case GL_LUMINANCE_ALPHA:

-      case GL_LUMINANCE4_ALPHA4:

-      case GL_LUMINANCE6_ALPHA2:

-      case GL_LUMINANCE8_ALPHA8:

-      case GL_LUMINANCE12_ALPHA4:

-      case GL_LUMINANCE12_ALPHA12:

-      case GL_LUMINANCE16_ALPHA16:

-      case GL_INTENSITY:

-      case GL_INTENSITY4:

-      case GL_INTENSITY8:

-      case GL_INTENSITY12:

-      case GL_INTENSITY16:

-      case GL_R8:

-      case GL_R16:

-      case GL_RG:

-      case GL_RG8:

-      case GL_RG16:

-      case 3:

-      case GL_RGB:

-      case GL_BGR:

-      case GL_R3_G3_B2:

-      case GL_RGB4:

-      case GL_RGB5:

-      case GL_RGB8:

-      case GL_RGB10:

-      case GL_RGB12:

-      case GL_RGB16:

-      case 4:

-      case GL_ABGR_EXT:

-      case GL_RGBA:

-      case GL_BGRA:

-      case GL_RGBA2:

-      case GL_RGBA4:

-      case GL_RGB5_A1:

-      case GL_RGBA8:

-      case GL_RGB10_A2:

-      case GL_RGBA12:

-      case GL_RGBA16:

-      /* float texture formats */

-      case GL_ALPHA16F_ARB:

-      case GL_ALPHA32F_ARB:

-      case GL_LUMINANCE16F_ARB:

-      case GL_LUMINANCE32F_ARB:

-      case GL_LUMINANCE_ALPHA16F_ARB:

-      case GL_LUMINANCE_ALPHA32F_ARB:

-      case GL_INTENSITY16F_ARB:

-      case GL_INTENSITY32F_ARB:

-      case GL_R16F:

-      case GL_R32F:

-      case GL_RG16F:

-      case GL_RG32F:

-      case GL_RGB16F_ARB:

-      case GL_RGB32F_ARB:

-      case GL_RGBA16F_ARB:

-      case GL_RGBA32F_ARB:

-      /* compressed formats */

-      case GL_COMPRESSED_ALPHA:

-      case GL_COMPRESSED_LUMINANCE:

-      case GL_COMPRESSED_LUMINANCE_ALPHA:

-      case GL_COMPRESSED_INTENSITY:

-      case GL_COMPRESSED_RED:

-      case GL_COMPRESSED_RG:

-      case GL_COMPRESSED_RGB:

-      case GL_COMPRESSED_RGBA:

-      case GL_RGB_S3TC:

-      case GL_RGB4_S3TC:

-      case GL_RGBA_S3TC:

-      case GL_RGBA4_S3TC:

-      case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:

-      case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:

-      case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:

-      case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:

-      case GL_COMPRESSED_RGB_FXT1_3DFX:

-      case GL_COMPRESSED_RGBA_FXT1_3DFX:

-#if FEATURE_EXT_texture_sRGB

-      case GL_SRGB_EXT:

-      case GL_SRGB8_EXT:

-      case GL_SRGB_ALPHA_EXT:

-      case GL_SRGB8_ALPHA8_EXT:

-      case GL_SLUMINANCE_ALPHA_EXT:

-      case GL_SLUMINANCE8_ALPHA8_EXT:

-      case GL_SLUMINANCE_EXT:

-      case GL_SLUMINANCE8_EXT:

-      case GL_COMPRESSED_SRGB_EXT:

-      case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:

-      case GL_COMPRESSED_SRGB_ALPHA_EXT:

-      case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:

-      case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:

-      case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:

-      case GL_COMPRESSED_SLUMINANCE_EXT:

-      case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:

-#endif /* FEATURE_EXT_texture_sRGB */

-      case GL_COMPRESSED_RED_RGTC1:

-      case GL_COMPRESSED_SIGNED_RED_RGTC1:

-      case GL_COMPRESSED_RG_RGTC2:

-      case GL_COMPRESSED_SIGNED_RG_RGTC2:

-      case GL_COMPRESSED_LUMINANCE_LATC1_EXT:

-      case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:

-      case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:

-      case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:

-      case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:

-      /* generic integer formats */

-      case GL_RED_INTEGER_EXT:

-      case GL_GREEN_INTEGER_EXT:

-      case GL_BLUE_INTEGER_EXT:

-      case GL_ALPHA_INTEGER_EXT:

-      case GL_RGB_INTEGER_EXT:

-      case GL_RGBA_INTEGER_EXT:

-      case GL_BGR_INTEGER_EXT:

-      case GL_BGRA_INTEGER_EXT:

-      case GL_LUMINANCE_INTEGER_EXT:

-      case GL_LUMINANCE_ALPHA_INTEGER_EXT:

-      /* sized integer formats */

-      case GL_RGBA32UI_EXT:

-      case GL_RGB32UI_EXT:

-      case GL_ALPHA32UI_EXT:

-      case GL_INTENSITY32UI_EXT:

-      case GL_LUMINANCE32UI_EXT:

-      case GL_LUMINANCE_ALPHA32UI_EXT:

-      case GL_RGBA16UI_EXT:

-      case GL_RGB16UI_EXT:

-      case GL_ALPHA16UI_EXT:

-      case GL_INTENSITY16UI_EXT:

-      case GL_LUMINANCE16UI_EXT:

-      case GL_LUMINANCE_ALPHA16UI_EXT:

-      case GL_RGBA8UI_EXT:

-      case GL_RGB8UI_EXT:

-      case GL_ALPHA8UI_EXT:

-      case GL_INTENSITY8UI_EXT:

-      case GL_LUMINANCE8UI_EXT:

-      case GL_LUMINANCE_ALPHA8UI_EXT:

-      case GL_RGBA32I_EXT:

-      case GL_RGB32I_EXT:

-      case GL_ALPHA32I_EXT:

-      case GL_INTENSITY32I_EXT:

-      case GL_LUMINANCE32I_EXT:

-      case GL_LUMINANCE_ALPHA32I_EXT:

-      case GL_RGBA16I_EXT:

-      case GL_RGB16I_EXT:

-      case GL_ALPHA16I_EXT:

-      case GL_INTENSITY16I_EXT:

-      case GL_LUMINANCE16I_EXT:

-      case GL_LUMINANCE_ALPHA16I_EXT:

-      case GL_RGBA8I_EXT:

-      case GL_RGB8I_EXT:

-      case GL_ALPHA8I_EXT:

-      case GL_INTENSITY8I_EXT:

-      case GL_LUMINANCE8I_EXT:

-      case GL_LUMINANCE_ALPHA8I_EXT:

-      /* signed, normalized texture formats */

-      case GL_RED_SNORM:

-      case GL_R8_SNORM:

-      case GL_R16_SNORM:

-      case GL_RG_SNORM:

-      case GL_RG8_SNORM:

-      case GL_RG16_SNORM:

-      case GL_RGB_SNORM:

-      case GL_RGB8_SNORM:

-      case GL_RGB16_SNORM:

-      case GL_RGBA_SNORM:

-      case GL_RGBA8_SNORM:

-      case GL_RGBA16_SNORM:

-      case GL_ALPHA_SNORM:

-      case GL_ALPHA8_SNORM:

-      case GL_ALPHA16_SNORM:

-      case GL_LUMINANCE_SNORM:

-      case GL_LUMINANCE8_SNORM:

-      case GL_LUMINANCE16_SNORM:

-      case GL_LUMINANCE_ALPHA_SNORM:

-      case GL_LUMINANCE8_ALPHA8_SNORM:

-      case GL_LUMINANCE16_ALPHA16_SNORM:

-      case GL_INTENSITY_SNORM:

-      case GL_INTENSITY8_SNORM:

-      case GL_INTENSITY16_SNORM:

-      case GL_RGB9_E5:

-      case GL_R11F_G11F_B10F:

-         return GL_TRUE;

-      case GL_YCBCR_MESA:  /* not considered to be RGB */

-         /* fall-through */

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a color index format.

- */

-GLboolean

-_mesa_is_index_format(GLenum format)

-{

-   switch (format) {

-      case GL_COLOR_INDEX:

-      case GL_COLOR_INDEX1_EXT:

-      case GL_COLOR_INDEX2_EXT:

-      case GL_COLOR_INDEX4_EXT:

-      case GL_COLOR_INDEX8_EXT:

-      case GL_COLOR_INDEX12_EXT:

-      case GL_COLOR_INDEX16_EXT:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a depth component format.

- */

-GLboolean

-_mesa_is_depth_format(GLenum format)

-{

-   switch (format) {

-      case GL_DEPTH_COMPONENT:

-      case GL_DEPTH_COMPONENT16:

-      case GL_DEPTH_COMPONENT24:

-      case GL_DEPTH_COMPONENT32:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a stencil format.

- */

-GLboolean

-_mesa_is_stencil_format(GLenum format)

-{

-   switch (format) {

-      case GL_STENCIL_INDEX:

-      case GL_DEPTH_STENCIL:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a YCbCr format.

- */

-GLboolean

-_mesa_is_ycbcr_format(GLenum format)

-{

-   switch (format) {

-      case GL_YCBCR_MESA:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a depth+stencil format.

- */

-GLboolean

-_mesa_is_depthstencil_format(GLenum format)

-{

-   switch (format) {

-      case GL_DEPTH24_STENCIL8_EXT:

-      case GL_DEPTH_STENCIL_EXT:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a depth or stencil format.

- */

-GLboolean

-_mesa_is_depth_or_stencil_format(GLenum format)

-{

-   switch (format) {

-      case GL_DEPTH_COMPONENT:

-      case GL_DEPTH_COMPONENT16:

-      case GL_DEPTH_COMPONENT24:

-      case GL_DEPTH_COMPONENT32:

-      case GL_STENCIL_INDEX:

-      case GL_STENCIL_INDEX1_EXT:

-      case GL_STENCIL_INDEX4_EXT:

-      case GL_STENCIL_INDEX8_EXT:

-      case GL_STENCIL_INDEX16_EXT:

-      case GL_DEPTH_STENCIL_EXT:

-      case GL_DEPTH24_STENCIL8_EXT:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given image format is a dudv format.

- */

-GLboolean

-_mesa_is_dudv_format(GLenum format)

-{

-   switch (format) {

-      case GL_DUDV_ATI:

-      case GL_DU8DV8_ATI:

-         return GL_TRUE;

-      default:

-         return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if the given format is an integer (non-normalized) format.

- */

-GLboolean

-_mesa_is_integer_format(GLenum format)

-{

-   switch (format) {

-   /* generic integer formats */

-   case GL_RED_INTEGER_EXT:

-   case GL_GREEN_INTEGER_EXT:

-   case GL_BLUE_INTEGER_EXT:

-   case GL_ALPHA_INTEGER_EXT:

-   case GL_RGB_INTEGER_EXT:

-   case GL_RGBA_INTEGER_EXT:

-   case GL_BGR_INTEGER_EXT:

-   case GL_BGRA_INTEGER_EXT:

-   case GL_LUMINANCE_INTEGER_EXT:

-   case GL_LUMINANCE_ALPHA_INTEGER_EXT:

-   /* specific integer formats */

-   case GL_RGBA32UI_EXT:

-   case GL_RGB32UI_EXT:

-   case GL_ALPHA32UI_EXT:

-   case GL_INTENSITY32UI_EXT:

-   case GL_LUMINANCE32UI_EXT:

-   case GL_LUMINANCE_ALPHA32UI_EXT:

-   case GL_RGBA16UI_EXT:

-   case GL_RGB16UI_EXT:

-   case GL_ALPHA16UI_EXT:

-   case GL_INTENSITY16UI_EXT:

-   case GL_LUMINANCE16UI_EXT:

-   case GL_LUMINANCE_ALPHA16UI_EXT:

-   case GL_RGBA8UI_EXT:

-   case GL_RGB8UI_EXT:

-   case GL_ALPHA8UI_EXT:

-   case GL_INTENSITY8UI_EXT:

-   case GL_LUMINANCE8UI_EXT:

-   case GL_LUMINANCE_ALPHA8UI_EXT:

-   case GL_RGBA32I_EXT:

-   case GL_RGB32I_EXT:

-   case GL_ALPHA32I_EXT:

-   case GL_INTENSITY32I_EXT:

-   case GL_LUMINANCE32I_EXT:

-   case GL_LUMINANCE_ALPHA32I_EXT:

-   case GL_RGBA16I_EXT:

-   case GL_RGB16I_EXT:

-   case GL_ALPHA16I_EXT:

-   case GL_INTENSITY16I_EXT:

-   case GL_LUMINANCE16I_EXT:

-   case GL_LUMINANCE_ALPHA16I_EXT:

-   case GL_RGBA8I_EXT:

-   case GL_RGB8I_EXT:

-   case GL_ALPHA8I_EXT:

-   case GL_INTENSITY8I_EXT:

-   case GL_LUMINANCE8I_EXT:

-   case GL_LUMINANCE_ALPHA8I_EXT:

-      return GL_TRUE;

-   default:

-      return GL_FALSE;

-   }

-}

-

-

-/**

- * Test if an image format is a supported compressed format.

- * \param format the internal format token provided by the user.

- * \return GL_TRUE if compressed, GL_FALSE if uncompressed

- */

-GLboolean

-_mesa_is_compressed_format(struct gl_context *ctx, GLenum format)

-{

-   switch (format) {

-   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:

-   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:

-   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:

-   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:

-      return ctx->Extensions.EXT_texture_compression_s3tc;

-   case GL_RGB_S3TC:

-   case GL_RGB4_S3TC:

-   case GL_RGBA_S3TC:

-   case GL_RGBA4_S3TC:

-      return ctx->Extensions.S3_s3tc;

-   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:

-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:

-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:

-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:

-      return ctx->Extensions.EXT_texture_sRGB

-         && ctx->Extensions.EXT_texture_compression_s3tc;

-   case GL_COMPRESSED_RGB_FXT1_3DFX:

-   case GL_COMPRESSED_RGBA_FXT1_3DFX:

-      return ctx->Extensions.TDFX_texture_compression_FXT1;

-   case GL_COMPRESSED_RED_RGTC1:

-   case GL_COMPRESSED_SIGNED_RED_RGTC1:

-   case GL_COMPRESSED_RG_RGTC2:

-   case GL_COMPRESSED_SIGNED_RG_RGTC2:

-      return ctx->Extensions.ARB_texture_compression_rgtc;

-   case GL_COMPRESSED_LUMINANCE_LATC1_EXT:

-   case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:

-   case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:

-   case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:

-      return ctx->Extensions.EXT_texture_compression_latc;

-   case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:

-      return ctx->Extensions.ATI_texture_compression_3dc;

-   default:

-      return GL_FALSE;

-   }

-}

-

-

-/**

- * Return the address of a specific pixel in an image (1D, 2D or 3D).

- *

- * Pixel unpacking/packing parameters are observed according to \p packing.

- *

- * \param dimensions either 1, 2 or 3 to indicate dimensionality of image

- * \param image  starting address of image data

- * \param width  the image width

- * \param height  theimage height

- * \param format  the pixel format

- * \param type  the pixel data type

- * \param packing  the pixelstore attributes

- * \param img  which image in the volume (0 for 1D or 2D images)

- * \param row  row of pixel in the image (0 for 1D images)

- * \param column column of pixel in the image

- * 

- * \return address of pixel on success, or NULL on error.

- *

- * \sa gl_pixelstore_attrib.

- */

-GLvoid *

-_mesa_image_address( GLuint dimensions,

-                     const struct gl_pixelstore_attrib *packing,

-                     const GLvoid *image,

-                     GLsizei width, GLsizei height,

-                     GLenum format, GLenum type,

-                     GLint img, GLint row, GLint column )

-{

-   GLint alignment;        /* 1, 2 or 4 */

-   GLint pixels_per_row;

-   GLint rows_per_image;

-   GLint skiprows;

-   GLint skippixels;

-   GLint skipimages;       /* for 3-D volume images */

-   GLubyte *pixel_addr;

-

-   ASSERT(dimensions >= 1 && dimensions <= 3);

-

-   alignment = packing->Alignment;

-   if (packing->RowLength > 0) {

-      pixels_per_row = packing->RowLength;

-   }

-   else {

-      pixels_per_row = width;

-   }

-   if (packing->ImageHeight > 0) {

-      rows_per_image = packing->ImageHeight;

-   }

-   else {

-      rows_per_image = height;

-   }

-

-   skippixels = packing->SkipPixels;

-   /* Note: SKIP_ROWS _is_ used for 1D images */

-   skiprows = packing->SkipRows;

-   /* Note: SKIP_IMAGES is only used for 3D images */

-   skipimages = (dimensions == 3) ? packing->SkipImages : 0;

-

-   if (type == GL_BITMAP) {

-      /* BITMAP data */

-      GLint comp_per_pixel;   /* components per pixel */

-      GLint bytes_per_comp;   /* bytes per component */

-      GLint bytes_per_row;

-      GLint bytes_per_image;

-

-      /* Compute bytes per component */

-      bytes_per_comp = _mesa_sizeof_packed_type( type );

-      if (bytes_per_comp < 0) {

-         return NULL;

-      }

-

-      /* Compute number of components per pixel */

-      comp_per_pixel = _mesa_components_in_format( format );

-      if (comp_per_pixel < 0) {

-         return NULL;

-      }

-

-      bytes_per_row = alignment

-                    * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );

-

-      bytes_per_image = bytes_per_row * rows_per_image;

-

-      pixel_addr = (GLubyte *) image

-                 + (skipimages + img) * bytes_per_image

-                 + (skiprows + row) * bytes_per_row

-                 + (skippixels + column) / 8;

-   }

-   else {

-      /* Non-BITMAP data */

-      GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;

-      GLint topOfImage;

-

-      bytes_per_pixel = _mesa_bytes_per_pixel( format, type );

-

-      /* The pixel type and format should have been error checked earlier */

-      assert(bytes_per_pixel > 0);

-

-      bytes_per_row = pixels_per_row * bytes_per_pixel;

-      remainder = bytes_per_row % alignment;

-      if (remainder > 0)

-         bytes_per_row += (alignment - remainder);

-

-      ASSERT(bytes_per_row % alignment == 0);

-

-      bytes_per_image = bytes_per_row * rows_per_image;

-

-      if (packing->Invert) {

-         /* set pixel_addr to the last row */

-         topOfImage = bytes_per_row * (height - 1);

-         bytes_per_row = -bytes_per_row;

-      }

-      else {

-         topOfImage = 0;

-      }

-

-      /* compute final pixel address */

-      pixel_addr = (GLubyte *) image

-                 + (skipimages + img) * bytes_per_image

-                 + topOfImage

-                 + (skiprows + row) * bytes_per_row

-                 + (skippixels + column) * bytes_per_pixel;

-   }

-

-   return (GLvoid *) pixel_addr;

-}

-

-

-GLvoid *

-_mesa_image_address1d( const struct gl_pixelstore_attrib *packing,

-                       const GLvoid *image,

-                       GLsizei width,

-                       GLenum format, GLenum type,

-                       GLint column )

-{

-   return _mesa_image_address(1, packing, image, width, 1,

-                              format, type, 0, 0, column);

-}

-

-

-GLvoid *

-_mesa_image_address2d( const struct gl_pixelstore_attrib *packing,

-                       const GLvoid *image,

-                       GLsizei width, GLsizei height,

-                       GLenum format, GLenum type,

-                       GLint row, GLint column )

-{

-   return _mesa_image_address(2, packing, image, width, height,

-                              format, type, 0, row, column);

-}

-

-

-GLvoid *

-_mesa_image_address3d( const struct gl_pixelstore_attrib *packing,

-                       const GLvoid *image,

-                       GLsizei width, GLsizei height,

-                       GLenum format, GLenum type,

-                       GLint img, GLint row, GLint column )

-{

-   return _mesa_image_address(3, packing, image, width, height,

-                              format, type, img, row, column);

-}

-

-

-

-/**

- * Compute the stride (in bytes) between image rows.

- *

- * \param packing the pixelstore attributes

- * \param width image width.

- * \param format pixel format.

- * \param type pixel data type.

- * 

- * \return the stride in bytes for the given parameters, or -1 if error

- */

-GLint

-_mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,

-                        GLint width, GLenum format, GLenum type )

-{

-   GLint bytesPerRow, remainder;

-

-   ASSERT(packing);

-

-   if (type == GL_BITMAP) {

-      if (packing->RowLength == 0) {

-         bytesPerRow = (width + 7) / 8;

-      }

-      else {

-         bytesPerRow = (packing->RowLength + 7) / 8;

-      }

-   }

-   else {

-      /* Non-BITMAP data */

-      const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);

-      if (bytesPerPixel <= 0)

-         return -1;  /* error */

-      if (packing->RowLength == 0) {

-         bytesPerRow = bytesPerPixel * width;

-      }

-      else {

-         bytesPerRow = bytesPerPixel * packing->RowLength;

-      }

-   }

-

-   remainder = bytesPerRow % packing->Alignment;

-   if (remainder > 0) {

-      bytesPerRow += (packing->Alignment - remainder);

-   }

-

-   if (packing->Invert) {

-      /* negate the bytes per row (negative row stride) */

-      bytesPerRow = -bytesPerRow;

-   }

-

-   return bytesPerRow;

-}

-

-

-/*

- * Compute the stride between images in a 3D texture (in bytes) for the given

- * pixel packing parameters and image width, format and type.

- */

-GLint

-_mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,

-                          GLint width, GLint height,

-                          GLenum format, GLenum type )

-{

-   GLint bytesPerRow, bytesPerImage, remainder;

-

-   ASSERT(packing);

-

-   if (type == GL_BITMAP) {

-      if (packing->RowLength == 0) {

-         bytesPerRow = (width + 7) / 8;

-      }

-      else {

-         bytesPerRow = (packing->RowLength + 7) / 8;

-      }

-   }

-   else {

-      const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);

-

-      if (bytesPerPixel <= 0)

-         return -1;  /* error */

-      if (packing->RowLength == 0) {

-         bytesPerRow = bytesPerPixel * width;

-      }

-      else {

-         bytesPerRow = bytesPerPixel * packing->RowLength;

-      }

-   }

-

-   remainder = bytesPerRow % packing->Alignment;

-   if (remainder > 0)

-      bytesPerRow += (packing->Alignment - remainder);

-

-   if (packing->ImageHeight == 0)

-      bytesPerImage = bytesPerRow * height;

-   else

-      bytesPerImage = bytesPerRow * packing->ImageHeight;

-

-   return bytesPerImage;

-}

-

-

-

-/**

- * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.

- * This is typically used to convert a bitmap into a GLubyte/pixel texture.

- * "On" bits will set texels to \p onValue.

- * "Off" bits will not modify texels.

- * \param width  src bitmap width in pixels

- * \param height  src bitmap height in pixels

- * \param unpack  bitmap unpacking state

- * \param bitmap  the src bitmap data

- * \param destBuffer  start of dest buffer

- * \param destStride  row stride in dest buffer

- * \param onValue  if bit is 1, set destBuffer pixel to this value

- */

-void

-_mesa_expand_bitmap(GLsizei width, GLsizei height,

-                    const struct gl_pixelstore_attrib *unpack,

-                    const GLubyte *bitmap,

-                    GLubyte *destBuffer, GLint destStride,

-                    GLubyte onValue)

-{

-   const GLubyte *srcRow = (const GLubyte *)

-      _mesa_image_address2d(unpack, bitmap, width, height,

-                            GL_COLOR_INDEX, GL_BITMAP, 0, 0);

-   const GLint srcStride = _mesa_image_row_stride(unpack, width,

-                                                  GL_COLOR_INDEX, GL_BITMAP);

-   GLint row, col;

-

-#define SET_PIXEL(COL, ROW) \

-   destBuffer[(ROW) * destStride + (COL)] = onValue;

-

-   for (row = 0; row < height; row++) {

-      const GLubyte *src = srcRow;

-

-      if (unpack->LsbFirst) {

-         /* Lsb first */

-         GLubyte mask = 1U << (unpack->SkipPixels & 0x7);

-         for (col = 0; col < width; col++) {

-

-            if (*src & mask) {

-               SET_PIXEL(col, row);

-            }

-

-            if (mask == 128U) {

-               src++;

-               mask = 1U;

-            }

-            else {

-               mask = mask << 1;

-            }

-         }

-

-         /* get ready for next row */

-         if (mask != 1)

-            src++;

-      }

-      else {

-         /* Msb first */

-         GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);

-         for (col = 0; col < width; col++) {

-

-            if (*src & mask) {

-               SET_PIXEL(col, row);

-            }

-

-            if (mask == 1U) {

-               src++;

-               mask = 128U;

-            }

-            else {

-               mask = mask >> 1;

-            }

-         }

-

-         /* get ready for next row */

-         if (mask != 128)

-            src++;

-      }

-

-      srcRow += srcStride;

-   } /* row */

-

-#undef SET_PIXEL

-}

-

-

-

-

-/**

- * Convert an array of RGBA colors from one datatype to another.

- * NOTE: src may equal dst.  In that case, we use a temporary buffer.

- */

-void

-_mesa_convert_colors(GLenum srcType, const GLvoid *src,

-                     GLenum dstType, GLvoid *dst,

-                     GLuint count, const GLubyte mask[])

-{

-   GLuint tempBuffer[MAX_WIDTH][4];

-   const GLboolean useTemp = (src == dst);

-

-   ASSERT(srcType != dstType);

-

-   switch (srcType) {

-   case GL_UNSIGNED_BYTE:

-      if (dstType == GL_UNSIGNED_SHORT) {

-         const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;

-         GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);

-         GLuint i;

-         for (i = 0; i < count; i++) {

-            if (!mask || mask[i]) {

-               dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);

-               dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);

-               dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);

-               dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);

-            }

-         }

-         if (useTemp)

-            memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));

-      }

-      else {

-         const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;

-         GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);

-         GLuint i;

-         ASSERT(dstType == GL_FLOAT);

-         for (i = 0; i < count; i++) {

-            if (!mask || mask[i]) {

-               dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);

-               dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);

-               dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);

-               dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);

-            }

-         }

-         if (useTemp)

-            memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));

-      }

-      break;

-   case GL_UNSIGNED_SHORT:

-      if (dstType == GL_UNSIGNED_BYTE) {

-         const GLushort (*src2)[4] = (const GLushort (*)[4]) src;

-         GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);

-         GLuint i;

-         for (i = 0; i < count; i++) {

-            if (!mask || mask[i]) {

-               dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);

-               dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);

-               dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);

-               dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);

-            }

-         }

-         if (useTemp)

-            memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));

-      }

-      else {

-         const GLushort (*src2)[4] = (const GLushort (*)[4]) src;

-         GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);

-         GLuint i;

-         ASSERT(dstType == GL_FLOAT);

-         for (i = 0; i < count; i++) {

-            if (!mask || mask[i]) {

-               dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);

-               dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);

-               dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);

-               dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);

-            }

-         }

-         if (useTemp)

-            memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));

-      }

-      break;

-   case GL_FLOAT:

-      if (dstType == GL_UNSIGNED_BYTE) {

-         const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;

-         GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);

-         GLuint i;

-         for (i = 0; i < count; i++) {

-            if (!mask || mask[i]) {

-               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][RCOMP], src4[i][RCOMP]);

-               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][GCOMP], src4[i][GCOMP]);

-               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][BCOMP], src4[i][BCOMP]);

-               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][ACOMP], src4[i][ACOMP]);

-            }

-         }

-         if (useTemp)

-            memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));

-      }

-      else {

-         const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;

-         GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);

-         GLuint i;

-         ASSERT(dstType == GL_UNSIGNED_SHORT);

-         for (i = 0; i < count; i++) {

-            if (!mask || mask[i]) {

-               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);

-               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);

-               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);

-               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);

-            }

-         }

-         if (useTemp)

-            memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));

-      }

-      break;

-   default:

-      _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");

-   }

-}

-

-

-

-

-/**

- * Perform basic clipping for glDrawPixels.  The image's position and size

- * and the unpack SkipPixels and SkipRows are adjusted so that the image

- * region is entirely within the window and scissor bounds.

- * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).

- * If Pixel.ZoomY is -1, *destY will be changed to be the first row which

- * we'll actually write.  Beforehand, *destY-1 is the first drawing row.

- *

- * \return  GL_TRUE if image is ready for drawing or

- *          GL_FALSE if image was completely clipped away (draw nothing)

- */

-GLboolean

-_mesa_clip_drawpixels(const struct gl_context *ctx,

-                      GLint *destX, GLint *destY,

-                      GLsizei *width, GLsizei *height,

-                      struct gl_pixelstore_attrib *unpack)

-{

-   const struct gl_framebuffer *buffer = ctx->DrawBuffer;

-

-   if (unpack->RowLength == 0) {

-      unpack->RowLength = *width;

-   }

-

-   ASSERT(ctx->Pixel.ZoomX == 1.0F);

-   ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);

-

-   /* left clipping */

-   if (*destX < buffer->_Xmin) {

-      unpack->SkipPixels += (buffer->_Xmin - *destX);

-      *width -= (buffer->_Xmin - *destX);

-      *destX = buffer->_Xmin;

-   }

-   /* right clipping */

-   if (*destX + *width > buffer->_Xmax)

-      *width -= (*destX + *width - buffer->_Xmax);

-

-   if (*width <= 0)

-      return GL_FALSE;

-

-   if (ctx->Pixel.ZoomY == 1.0F) {

-      /* bottom clipping */

-      if (*destY < buffer->_Ymin) {

-         unpack->SkipRows += (buffer->_Ymin - *destY);

-         *height -= (buffer->_Ymin - *destY);

-         *destY = buffer->_Ymin;

-      }

-      /* top clipping */

-      if (*destY + *height > buffer->_Ymax)

-         *height -= (*destY + *height - buffer->_Ymax);

-   }

-   else { /* upside down */

-      /* top clipping */

-      if (*destY > buffer->_Ymax) {

-         unpack->SkipRows += (*destY - buffer->_Ymax);

-         *height -= (*destY - buffer->_Ymax);

-         *destY = buffer->_Ymax;

-      }

-      /* bottom clipping */

-      if (*destY - *height < buffer->_Ymin)

-         *height -= (buffer->_Ymin - (*destY - *height));

-      /* adjust destY so it's the first row to write to */

-      (*destY)--;

-   }

-

-   if (*height <= 0)

-      return GL_FALSE;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Perform clipping for glReadPixels.  The image's window position

- * and size, and the pack skipPixels, skipRows and rowLength are adjusted

- * so that the image region is entirely within the window bounds.

- * Note: this is different from _mesa_clip_drawpixels() in that the

- * scissor box is ignored, and we use the bounds of the current readbuffer

- * surface.

- *

- * \return  GL_TRUE if region to read is in bounds

- *          GL_FALSE if region is completely out of bounds (nothing to read)

- */

-GLboolean

-_mesa_clip_readpixels(const struct gl_context *ctx,

-                      GLint *srcX, GLint *srcY,

-                      GLsizei *width, GLsizei *height,

-                      struct gl_pixelstore_attrib *pack)

-{

-   const struct gl_framebuffer *buffer = ctx->ReadBuffer;

-

-   if (pack->RowLength == 0) {

-      pack->RowLength = *width;

-   }

-

-   /* left clipping */

-   if (*srcX < 0) {

-      pack->SkipPixels += (0 - *srcX);

-      *width -= (0 - *srcX);

-      *srcX = 0;

-   }

-   /* right clipping */

-   if (*srcX + *width > (GLsizei) buffer->Width)

-      *width -= (*srcX + *width - buffer->Width);

-

-   if (*width <= 0)

-      return GL_FALSE;

-

-   /* bottom clipping */

-   if (*srcY < 0) {

-      pack->SkipRows += (0 - *srcY);

-      *height -= (0 - *srcY);

-      *srcY = 0;

-   }

-   /* top clipping */

-   if (*srcY + *height > (GLsizei) buffer->Height)

-      *height -= (*srcY + *height - buffer->Height);

-

-   if (*height <= 0)

-      return GL_FALSE;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Do clipping for a glCopyTexSubImage call.

- * The framebuffer source region might extend outside the framebuffer

- * bounds.  Clip the source region against the framebuffer bounds and

- * adjust the texture/dest position and size accordingly.

- *

- * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.

- */

-GLboolean

-_mesa_clip_copytexsubimage(const struct gl_context *ctx,

-                           GLint *destX, GLint *destY,

-                           GLint *srcX, GLint *srcY,

-                           GLsizei *width, GLsizei *height)

-{

-   const struct gl_framebuffer *fb = ctx->ReadBuffer;

-   const GLint srcX0 = *srcX, srcY0 = *srcY;

-

-   if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,

-                            srcX, srcY, width, height)) {

-      *destX = *destX + *srcX - srcX0;

-      *destY = *destY + *srcY - srcY0;

-

-      return GL_TRUE;

-   }

-   else {

-      return GL_FALSE;

-   }

-}

-

-

-

-/**

- * Clip the rectangle defined by (x, y, width, height) against the bounds

- * specified by [xmin, xmax) and [ymin, ymax).

- * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.

- */

-GLboolean

-_mesa_clip_to_region(GLint xmin, GLint ymin,

-                     GLint xmax, GLint ymax,

-                     GLint *x, GLint *y,

-                     GLsizei *width, GLsizei *height )

-{

-   /* left clipping */

-   if (*x < xmin) {

-      *width -= (xmin - *x);

-      *x = xmin;

-   }

-

-   /* right clipping */

-   if (*x + *width > xmax)

-      *width -= (*x + *width - xmax);

-

-   if (*width <= 0)

-      return GL_FALSE;

-

-   /* bottom (or top) clipping */

-   if (*y < ymin) {

-      *height -= (ymin - *y);

-      *y = ymin;

-   }

-

-   /* top (or bottom) clipping */

-   if (*y + *height > ymax)

-      *height -= (*y + *height - ymax);

-

-   if (*height <= 0)

-      return GL_FALSE;

-

-   return GL_TRUE;

-}

-

-

-/**

- * Clip dst coords against Xmax (or Ymax).

- */

-static INLINE void

-clip_right_or_top(GLint *srcX0, GLint *srcX1,

-                  GLint *dstX0, GLint *dstX1,

-                  GLint maxValue)

-{

-   GLfloat t, bias;

-

-   if (*dstX1 > maxValue) {

-      /* X1 outside right edge */

-      ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */

-      t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);

-      /* chop off [t, 1] part */

-      ASSERT(t >= 0.0 && t <= 1.0);

-      *dstX1 = maxValue;

-      bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;

-      *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);

-   }

-   else if (*dstX0 > maxValue) {

-      /* X0 outside right edge */

-      ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */

-      t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);

-      /* chop off [t, 1] part */

-      ASSERT(t >= 0.0 && t <= 1.0);

-      *dstX0 = maxValue;

-      bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;

-      *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);

-   }

-}

-

-

-/**

- * Clip dst coords against Xmin (or Ymin).

- */

-static INLINE void

-clip_left_or_bottom(GLint *srcX0, GLint *srcX1,

-                    GLint *dstX0, GLint *dstX1,

-                    GLint minValue)

-{

-   GLfloat t, bias;

-

-   if (*dstX0 < minValue) {

-      /* X0 outside left edge */

-      ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */

-      t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);

-      /* chop off [0, t] part */

-      ASSERT(t >= 0.0 && t <= 1.0);

-      *dstX0 = minValue;

-      bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */

-      *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);

-   }

-   else if (*dstX1 < minValue) {

-      /* X1 outside left edge */

-      ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */

-      t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);

-      /* chop off [0, t] part */

-      ASSERT(t >= 0.0 && t <= 1.0);

-      *dstX1 = minValue;

-      bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;

-      *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);

-   }

-}

-

-

-/**

- * Do clipping of blit src/dest rectangles.

- * The dest rect is clipped against both the buffer bounds and scissor bounds.

- * The src rect is just clipped against the buffer bounds.

- *

- * When either the src or dest rect is clipped, the other is also clipped

- * proportionately!

- *

- * Note that X0 need not be less than X1 (same for Y) for either the source

- * and dest rects.  That makes the clipping a little trickier.

- *

- * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped

- */

-GLboolean

-_mesa_clip_blit(struct gl_context *ctx,

-                GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,

-                GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)

-{

-   const GLint srcXmin = 0;

-   const GLint srcXmax = ctx->ReadBuffer->Width;

-   const GLint srcYmin = 0;

-   const GLint srcYmax = ctx->ReadBuffer->Height;

-

-   /* these include scissor bounds */

-   const GLint dstXmin = ctx->DrawBuffer->_Xmin;

-   const GLint dstXmax = ctx->DrawBuffer->_Xmax;

-   const GLint dstYmin = ctx->DrawBuffer->_Ymin;

-   const GLint dstYmax = ctx->DrawBuffer->_Ymax;

-

-   /*

-   printf("PreClipX:  src: %d .. %d  dst: %d .. %d\n",

-          *srcX0, *srcX1, *dstX0, *dstX1);

-   printf("PreClipY:  src: %d .. %d  dst: %d .. %d\n",

-          *srcY0, *srcY1, *dstY0, *dstY1);

-   */

-

-   /* trivial rejection tests */

-   if (*dstX0 == *dstX1)

-      return GL_FALSE; /* no width */

-   if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)

-      return GL_FALSE; /* totally out (left) of bounds */

-   if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)

-      return GL_FALSE; /* totally out (right) of bounds */

-

-   if (*dstY0 == *dstY1)

-      return GL_FALSE;

-   if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)

-      return GL_FALSE;

-   if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)

-      return GL_FALSE;

-

-   if (*srcX0 == *srcX1)

-      return GL_FALSE;

-   if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)

-      return GL_FALSE;

-   if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)

-      return GL_FALSE;

-

-   if (*srcY0 == *srcY1)

-      return GL_FALSE;

-   if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)

-      return GL_FALSE;

-   if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)

-      return GL_FALSE;

-

-   /*

-    * dest clip

-    */

-   clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);

-   clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);

-   clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);

-   clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);

-

-   /*

-    * src clip (just swap src/dst values from above)

-    */

-   clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);

-   clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);

-   clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);

-   clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);

-

-   /*

-   printf("PostClipX: src: %d .. %d  dst: %d .. %d\n",

-          *srcX0, *srcX1, *dstX0, *dstX1);

-   printf("PostClipY: src: %d .. %d  dst: %d .. %d\n",

-          *srcY0, *srcY1, *dstY0, *dstY1);

-   */

-

-   ASSERT(*dstX0 >= dstXmin);

-   ASSERT(*dstX0 <= dstXmax);

-   ASSERT(*dstX1 >= dstXmin);

-   ASSERT(*dstX1 <= dstXmax);

-

-   ASSERT(*dstY0 >= dstYmin);

-   ASSERT(*dstY0 <= dstYmax);

-   ASSERT(*dstY1 >= dstYmin);

-   ASSERT(*dstY1 <= dstYmax);

-

-   ASSERT(*srcX0 >= srcXmin);

-   ASSERT(*srcX0 <= srcXmax);

-   ASSERT(*srcX1 >= srcXmin);

-   ASSERT(*srcX1 <= srcXmax);

-

-   ASSERT(*srcY0 >= srcYmin);

-   ASSERT(*srcY0 <= srcYmax);

-   ASSERT(*srcY1 >= srcYmin);

-   ASSERT(*srcY1 <= srcYmax);

-

-   return GL_TRUE;

-}

+/*
+ * Mesa 3-D graphics library
+ * Version:  7.5
+ *
+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
+ * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/**
+ * \file image.c
+ * Image handling.
+ */
+
+
+#include "glheader.h"
+#include "colormac.h"
+#include "image.h"
+#include "imports.h"
+#include "macros.h"
+#include "mfeatures.h"
+#include "mtypes.h"
+
+
+/**
+ * NOTE:
+ * Normally, BYTE_TO_FLOAT(0) returns 0.00392  That causes problems when
+ * we later convert the float to a packed integer value (such as for
+ * GL_RGB5_A1) because we'll wind up with a non-zero value.
+ *
+ * We redefine the macros here so zero is handled correctly.
+ */
+#undef BYTE_TO_FLOAT
+#define BYTE_TO_FLOAT(B)    ((B) == 0 ? 0.0F : ((2.0F * (B) + 1.0F) * (1.0F/255.0F)))
+
+#undef SHORT_TO_FLOAT
+#define SHORT_TO_FLOAT(S)   ((S) == 0 ? 0.0F : ((2.0F * (S) + 1.0F) * (1.0F/65535.0F)))
+
+
+
+/** Compute ceiling of integer quotient of A divided by B. */
+#define CEILING( A, B )  ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
+
+
+/**
+ * \return GL_TRUE if type is packed pixel type, GL_FALSE otherwise.
+ */
+GLboolean
+_mesa_type_is_packed(GLenum type)
+{
+   switch (type) {
+   case GL_UNSIGNED_BYTE_3_3_2:
+   case GL_UNSIGNED_BYTE_2_3_3_REV:
+   case MESA_UNSIGNED_BYTE_4_4:
+   case GL_UNSIGNED_SHORT_5_6_5:
+   case GL_UNSIGNED_SHORT_5_6_5_REV:
+   case GL_UNSIGNED_SHORT_4_4_4_4:
+   case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+   case GL_UNSIGNED_SHORT_5_5_5_1:
+   case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+   case GL_UNSIGNED_INT_8_8_8_8:
+   case GL_UNSIGNED_INT_8_8_8_8_REV:
+   case GL_UNSIGNED_INT_10_10_10_2:
+   case GL_UNSIGNED_INT_2_10_10_10_REV:
+   case GL_UNSIGNED_SHORT_8_8_MESA:
+   case GL_UNSIGNED_SHORT_8_8_REV_MESA:
+   case GL_UNSIGNED_INT_24_8_EXT:
+   case GL_UNSIGNED_INT_5_9_9_9_REV:
+   case GL_UNSIGNED_INT_10F_11F_11F_REV:
+   case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
+      return GL_TRUE;
+   }
+
+   return GL_FALSE;
+}
+
+
+
+/**
+ * Flip the order of the 2 bytes in each word in the given array.
+ *
+ * \param p array.
+ * \param n number of words.
+ */
+void
+_mesa_swap2( GLushort *p, GLuint n )
+{
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
+   }
+}
+
+
+
+/*
+ * Flip the order of the 4 bytes in each word in the given array.
+ */
+void
+_mesa_swap4( GLuint *p, GLuint n )
+{
+   GLuint i, a, b;
+   for (i = 0; i < n; i++) {
+      b = p[i];
+      a =  (b >> 24)
+	| ((b >> 8) & 0xff00)
+	| ((b << 8) & 0xff0000)
+	| ((b << 24) & 0xff000000);
+      p[i] = a;
+   }
+}
+
+
+/**
+ * Get the size of a GL data type.
+ *
+ * \param type GL data type.
+ *
+ * \return the size, in bytes, of the given data type, 0 if a GL_BITMAP, or -1
+ * if an invalid type enum.
+ */
+GLint
+_mesa_sizeof_type( GLenum type )
+{
+   switch (type) {
+      case GL_BITMAP:
+	 return 0;
+      case GL_UNSIGNED_BYTE:
+         return sizeof(GLubyte);
+      case GL_BYTE:
+	 return sizeof(GLbyte);
+      case GL_UNSIGNED_SHORT:
+	 return sizeof(GLushort);
+      case GL_SHORT:
+	 return sizeof(GLshort);
+      case GL_UNSIGNED_INT:
+	 return sizeof(GLuint);
+      case GL_INT:
+	 return sizeof(GLint);
+      case GL_FLOAT:
+	 return sizeof(GLfloat);
+      case GL_DOUBLE:
+	 return sizeof(GLdouble);
+      case GL_HALF_FLOAT_ARB:
+	 return sizeof(GLhalfARB);
+      case GL_FIXED:
+	 return sizeof(GLfixed);
+      default:
+         return -1;
+   }
+}
+
+
+/**
+ * Same as _mesa_sizeof_type() but also accepting the packed pixel
+ * format data types.
+ */
+GLint
+_mesa_sizeof_packed_type( GLenum type )
+{
+   switch (type) {
+      case GL_BITMAP:
+	 return 0;
+      case GL_UNSIGNED_BYTE:
+         return sizeof(GLubyte);
+      case GL_BYTE:
+	 return sizeof(GLbyte);
+      case GL_UNSIGNED_SHORT:
+	 return sizeof(GLushort);
+      case GL_SHORT:
+	 return sizeof(GLshort);
+      case GL_UNSIGNED_INT:
+	 return sizeof(GLuint);
+      case GL_INT:
+	 return sizeof(GLint);
+      case GL_HALF_FLOAT_ARB:
+	 return sizeof(GLhalfARB);
+      case GL_FLOAT:
+	 return sizeof(GLfloat);
+      case GL_UNSIGNED_BYTE_3_3_2:
+         return sizeof(GLubyte);
+      case GL_UNSIGNED_BYTE_2_3_3_REV:
+         return sizeof(GLubyte);
+      case MESA_UNSIGNED_BYTE_4_4:
+         return sizeof(GLubyte);
+      case GL_UNSIGNED_SHORT_5_6_5:
+         return sizeof(GLushort);
+      case GL_UNSIGNED_SHORT_5_6_5_REV:
+         return sizeof(GLushort);
+      case GL_UNSIGNED_SHORT_4_4_4_4:
+         return sizeof(GLushort);
+      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+         return sizeof(GLushort);
+      case GL_UNSIGNED_SHORT_5_5_5_1:
+         return sizeof(GLushort);
+      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+         return sizeof(GLushort);
+      case GL_UNSIGNED_INT_8_8_8_8:
+         return sizeof(GLuint);
+      case GL_UNSIGNED_INT_8_8_8_8_REV:
+         return sizeof(GLuint);
+      case GL_UNSIGNED_INT_10_10_10_2:
+         return sizeof(GLuint);
+      case GL_UNSIGNED_INT_2_10_10_10_REV:
+         return sizeof(GLuint);
+      case GL_UNSIGNED_SHORT_8_8_MESA:
+      case GL_UNSIGNED_SHORT_8_8_REV_MESA:
+         return sizeof(GLushort);      
+      case GL_UNSIGNED_INT_24_8_EXT:
+         return sizeof(GLuint);
+      case GL_UNSIGNED_INT_5_9_9_9_REV:
+         return sizeof(GLuint);
+      case GL_UNSIGNED_INT_10F_11F_11F_REV:
+         return sizeof(GLuint);
+      case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
+         return 8;
+      default:
+         return -1;
+   }
+}
+
+
+/**
+ * Get the number of components in a pixel format.
+ *
+ * \param format pixel format.
+ *
+ * \return the number of components in the given format, or -1 if a bad format.
+ */
+GLint
+_mesa_components_in_format( GLenum format )
+{
+   switch (format) {
+      case GL_COLOR_INDEX:
+      case GL_COLOR_INDEX1_EXT:
+      case GL_COLOR_INDEX2_EXT:
+      case GL_COLOR_INDEX4_EXT:
+      case GL_COLOR_INDEX8_EXT:
+      case GL_COLOR_INDEX12_EXT:
+      case GL_COLOR_INDEX16_EXT:
+      case GL_STENCIL_INDEX:
+      case GL_DEPTH_COMPONENT:
+      case GL_RED:
+      case GL_RED_INTEGER_EXT:
+      case GL_GREEN:
+      case GL_GREEN_INTEGER_EXT:
+      case GL_BLUE:
+      case GL_BLUE_INTEGER_EXT:
+      case GL_ALPHA:
+      case GL_ALPHA_INTEGER_EXT:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE_INTEGER_EXT:
+      case GL_INTENSITY:
+         return 1;
+      case GL_LUMINANCE_ALPHA:
+      case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+      case GL_RG:
+	 return 2;
+      case GL_RGB:
+      case GL_RGB_INTEGER_EXT:
+	 return 3;
+      case GL_RGBA:
+      case GL_RGBA_INTEGER_EXT:
+	 return 4;
+      case GL_BGR:
+	 return 3;
+      case GL_BGRA:
+	 return 4;
+      case GL_ABGR_EXT:
+         return 4;
+      case GL_YCBCR_MESA:
+         return 2;
+      case GL_DEPTH_STENCIL_EXT:
+         return 2;
+      case GL_DUDV_ATI:
+      case GL_DU8DV8_ATI:
+         return 2;
+      default:
+         return -1;
+   }
+}
+
+
+/**
+ * Get the bytes per pixel of pixel format type pair.
+ *
+ * \param format pixel format.
+ * \param type pixel type.
+ *
+ * \return bytes per pixel, or -1 if a bad format or type was given.
+ */
+GLint
+_mesa_bytes_per_pixel( GLenum format, GLenum type )
+{
+   GLint comps = _mesa_components_in_format( format );
+   if (comps < 0)
+      return -1;
+
+   switch (type) {
+      case GL_BITMAP:
+         return 0;  /* special case */
+      case GL_BYTE:
+      case GL_UNSIGNED_BYTE:
+         return comps * sizeof(GLubyte);
+      case GL_SHORT:
+      case GL_UNSIGNED_SHORT:
+         return comps * sizeof(GLshort);
+      case GL_INT:
+      case GL_UNSIGNED_INT:
+         return comps * sizeof(GLint);
+      case GL_FLOAT:
+         return comps * sizeof(GLfloat);
+      case GL_HALF_FLOAT_ARB:
+         return comps * sizeof(GLhalfARB);
+      case GL_UNSIGNED_BYTE_3_3_2:
+      case GL_UNSIGNED_BYTE_2_3_3_REV:
+         if (format == GL_RGB || format == GL_BGR ||
+             format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
+            return sizeof(GLubyte);
+         else
+            return -1;  /* error */
+      case GL_UNSIGNED_SHORT_5_6_5:
+      case GL_UNSIGNED_SHORT_5_6_5_REV:
+         if (format == GL_RGB || format == GL_BGR ||
+             format == GL_RGB_INTEGER_EXT || format == GL_BGR_INTEGER_EXT)
+            return sizeof(GLushort);
+         else
+            return -1;  /* error */
+      case GL_UNSIGNED_SHORT_4_4_4_4:
+      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+      case GL_UNSIGNED_SHORT_5_5_5_1:
+      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+         if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
+             format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
+            return sizeof(GLushort);
+         else
+            return -1;
+      case GL_UNSIGNED_INT_8_8_8_8:
+      case GL_UNSIGNED_INT_8_8_8_8_REV:
+      case GL_UNSIGNED_INT_10_10_10_2:
+      case GL_UNSIGNED_INT_2_10_10_10_REV:
+         if (format == GL_RGBA || format == GL_BGRA || format == GL_ABGR_EXT ||
+             format == GL_RGBA_INTEGER_EXT || format == GL_BGRA_INTEGER_EXT)
+            return sizeof(GLuint);
+         else
+            return -1;
+      case GL_UNSIGNED_SHORT_8_8_MESA:
+      case GL_UNSIGNED_SHORT_8_8_REV_MESA:
+         if (format == GL_YCBCR_MESA)
+            return sizeof(GLushort);
+         else
+            return -1;
+      case GL_UNSIGNED_INT_24_8_EXT:
+         if (format == GL_DEPTH_STENCIL_EXT)
+            return sizeof(GLuint);
+         else
+            return -1;
+      case GL_UNSIGNED_INT_5_9_9_9_REV:
+         if (format == GL_RGB)
+            return sizeof(GLuint);
+         else
+            return -1;
+      case GL_UNSIGNED_INT_10F_11F_11F_REV:
+         if (format == GL_RGB)
+            return sizeof(GLuint);
+         else
+            return -1;
+      case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
+         if (format == GL_DEPTH_STENCIL)
+            return 8;
+         else
+            return -1;
+      default:
+         return -1;
+   }
+}
+
+
+/**
+ * Test for a legal pixel format and type.
+ *
+ * \param format pixel format.
+ * \param type pixel type.
+ *
+ * \return GL_TRUE if the given pixel format and type are legal, or GL_FALSE
+ * otherwise.
+ */
+GLboolean
+_mesa_is_legal_format_and_type(const struct gl_context *ctx,
+                               GLenum format, GLenum type)
+{
+   switch (format) {
+      case GL_COLOR_INDEX:
+      case GL_STENCIL_INDEX:
+         switch (type) {
+            case GL_BITMAP:
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+               return GL_TRUE;
+            case GL_HALF_FLOAT_ARB:
+               return ctx->Extensions.ARB_half_float_pixel;
+            default:
+               return GL_FALSE;
+         }
+      case GL_RED:
+      case GL_GREEN:
+      case GL_BLUE:
+      case GL_ALPHA:
+#if 0 /* not legal!  see table 3.6 of the 1.5 spec */
+      case GL_INTENSITY:
+#endif
+      case GL_LUMINANCE:
+      case GL_LUMINANCE_ALPHA:
+      case GL_DEPTH_COMPONENT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+               return GL_TRUE;
+            case GL_HALF_FLOAT_ARB:
+               return ctx->Extensions.ARB_half_float_pixel;
+            default:
+               return GL_FALSE;
+         }
+      case GL_RG:
+	 if (!ctx->Extensions.ARB_texture_rg)
+	    return GL_FALSE;
+
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+               return GL_TRUE;
+            case GL_HALF_FLOAT_ARB:
+               return ctx->Extensions.ARB_half_float_pixel;
+            default:
+               return GL_FALSE;
+         }
+      case GL_RGB:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+            case GL_UNSIGNED_BYTE_3_3_2:
+            case GL_UNSIGNED_BYTE_2_3_3_REV:
+            case GL_UNSIGNED_SHORT_5_6_5:
+            case GL_UNSIGNED_SHORT_5_6_5_REV:
+               return GL_TRUE;
+            case GL_HALF_FLOAT_ARB:
+               return ctx->Extensions.ARB_half_float_pixel;
+            case GL_UNSIGNED_INT_5_9_9_9_REV:
+               return ctx->Extensions.EXT_texture_shared_exponent;
+            case GL_UNSIGNED_INT_10F_11F_11F_REV:
+               return ctx->Extensions.EXT_packed_float;
+            default:
+               return GL_FALSE;
+         }
+      case GL_BGR:
+         switch (type) {
+            /* NOTE: no packed types are supported with BGR.  That's
+             * intentional, according to the GL spec.
+             */
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+               return GL_TRUE;
+            case GL_HALF_FLOAT_ARB:
+               return ctx->Extensions.ARB_half_float_pixel;
+            default:
+               return GL_FALSE;
+         }
+      case GL_RGBA:
+      case GL_BGRA:
+      case GL_ABGR_EXT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+            case GL_UNSIGNED_SHORT_4_4_4_4:
+            case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+            case GL_UNSIGNED_SHORT_5_5_5_1:
+            case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+            case GL_UNSIGNED_INT_8_8_8_8:
+            case GL_UNSIGNED_INT_8_8_8_8_REV:
+            case GL_UNSIGNED_INT_10_10_10_2:
+            case GL_UNSIGNED_INT_2_10_10_10_REV:
+               return GL_TRUE;
+            case GL_HALF_FLOAT_ARB:
+               return ctx->Extensions.ARB_half_float_pixel;
+            default:
+               return GL_FALSE;
+         }
+      case GL_YCBCR_MESA:
+         if (type == GL_UNSIGNED_SHORT_8_8_MESA ||
+             type == GL_UNSIGNED_SHORT_8_8_REV_MESA)
+            return GL_TRUE;
+         else
+            return GL_FALSE;
+      case GL_DEPTH_STENCIL_EXT:
+         if ((ctx->Extensions.EXT_packed_depth_stencil &&
+              type == GL_UNSIGNED_INT_24_8_EXT) ||
+             (ctx->Extensions.ARB_depth_buffer_float &&
+              type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV))
+            return GL_TRUE;
+         else
+            return GL_FALSE;
+      case GL_DUDV_ATI:
+      case GL_DU8DV8_ATI:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_FLOAT:
+               return GL_TRUE;
+            default:
+               return GL_FALSE;
+         }
+
+      /* integer-valued formats */
+      case GL_RED_INTEGER_EXT:
+      case GL_GREEN_INTEGER_EXT:
+      case GL_BLUE_INTEGER_EXT:
+      case GL_ALPHA_INTEGER_EXT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+               return ctx->Extensions.EXT_texture_integer;
+            default:
+               return GL_FALSE;
+         }
+
+      case GL_RGB_INTEGER_EXT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_UNSIGNED_BYTE_3_3_2:
+            case GL_UNSIGNED_BYTE_2_3_3_REV:
+            case GL_UNSIGNED_SHORT_5_6_5:
+            case GL_UNSIGNED_SHORT_5_6_5_REV:
+               return ctx->Extensions.EXT_texture_integer;
+            default:
+               return GL_FALSE;
+         }
+
+      case GL_BGR_INTEGER_EXT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            /* NOTE: no packed formats w/ BGR format */
+               return ctx->Extensions.EXT_texture_integer;
+            default:
+               return GL_FALSE;
+         }
+
+      case GL_RGBA_INTEGER_EXT:
+      case GL_BGRA_INTEGER_EXT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+            case GL_UNSIGNED_SHORT_4_4_4_4:
+            case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+            case GL_UNSIGNED_SHORT_5_5_5_1:
+            case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+            case GL_UNSIGNED_INT_8_8_8_8:
+            case GL_UNSIGNED_INT_8_8_8_8_REV:
+            case GL_UNSIGNED_INT_10_10_10_2:
+            case GL_UNSIGNED_INT_2_10_10_10_REV:
+               return ctx->Extensions.EXT_texture_integer;
+            default:
+               return GL_FALSE;
+         }
+
+      case GL_LUMINANCE_INTEGER_EXT:
+      case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+         switch (type) {
+            case GL_BYTE:
+            case GL_UNSIGNED_BYTE:
+            case GL_SHORT:
+            case GL_UNSIGNED_SHORT:
+            case GL_INT:
+            case GL_UNSIGNED_INT:
+               return ctx->Extensions.EXT_texture_integer;
+            default:
+               return GL_FALSE;
+         }
+
+      default:
+         ; /* fall-through */
+   }
+   return GL_FALSE;
+}
+
+
+/**
+ * Test if the given image format is a color/RGBA format (i.e., not color
+ * index, depth, stencil, etc).
+ * \param format  the image format value (may by an internal texture format)
+ * \return GL_TRUE if its a color/RGBA format, GL_FALSE otherwise.
+ */
+GLboolean
+_mesa_is_color_format(GLenum format)
+{
+   switch (format) {
+      case GL_RED:
+      case GL_GREEN:
+      case GL_BLUE:
+      case GL_ALPHA:
+      case GL_ALPHA4:
+      case GL_ALPHA8:
+      case GL_ALPHA12:
+      case GL_ALPHA16:
+      case 1:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE4:
+      case GL_LUMINANCE8:
+      case GL_LUMINANCE12:
+      case GL_LUMINANCE16:
+      case 2:
+      case GL_LUMINANCE_ALPHA:
+      case GL_LUMINANCE4_ALPHA4:
+      case GL_LUMINANCE6_ALPHA2:
+      case GL_LUMINANCE8_ALPHA8:
+      case GL_LUMINANCE12_ALPHA4:
+      case GL_LUMINANCE12_ALPHA12:
+      case GL_LUMINANCE16_ALPHA16:
+      case GL_INTENSITY:
+      case GL_INTENSITY4:
+      case GL_INTENSITY8:
+      case GL_INTENSITY12:
+      case GL_INTENSITY16:
+      case GL_R8:
+      case GL_R16:
+      case GL_RG:
+      case GL_RG8:
+      case GL_RG16:
+      case 3:
+      case GL_RGB:
+      case GL_BGR:
+      case GL_R3_G3_B2:
+      case GL_RGB4:
+      case GL_RGB5:
+      case GL_RGB8:
+      case GL_RGB10:
+      case GL_RGB12:
+      case GL_RGB16:
+      case 4:
+      case GL_ABGR_EXT:
+      case GL_RGBA:
+      case GL_BGRA:
+      case GL_RGBA2:
+      case GL_RGBA4:
+      case GL_RGB5_A1:
+      case GL_RGBA8:
+      case GL_RGB10_A2:
+      case GL_RGBA12:
+      case GL_RGBA16:
+      /* float texture formats */
+      case GL_ALPHA16F_ARB:
+      case GL_ALPHA32F_ARB:
+      case GL_LUMINANCE16F_ARB:
+      case GL_LUMINANCE32F_ARB:
+      case GL_LUMINANCE_ALPHA16F_ARB:
+      case GL_LUMINANCE_ALPHA32F_ARB:
+      case GL_INTENSITY16F_ARB:
+      case GL_INTENSITY32F_ARB:
+      case GL_R16F:
+      case GL_R32F:
+      case GL_RG16F:
+      case GL_RG32F:
+      case GL_RGB16F_ARB:
+      case GL_RGB32F_ARB:
+      case GL_RGBA16F_ARB:
+      case GL_RGBA32F_ARB:
+      /* compressed formats */
+      case GL_COMPRESSED_ALPHA:
+      case GL_COMPRESSED_LUMINANCE:
+      case GL_COMPRESSED_LUMINANCE_ALPHA:
+      case GL_COMPRESSED_INTENSITY:
+      case GL_COMPRESSED_RED:
+      case GL_COMPRESSED_RG:
+      case GL_COMPRESSED_RGB:
+      case GL_COMPRESSED_RGBA:
+      case GL_RGB_S3TC:
+      case GL_RGB4_S3TC:
+      case GL_RGBA_S3TC:
+      case GL_RGBA4_S3TC:
+      case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+      case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+      case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+      case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+      case GL_COMPRESSED_RGB_FXT1_3DFX:
+      case GL_COMPRESSED_RGBA_FXT1_3DFX:
+#if FEATURE_EXT_texture_sRGB
+      case GL_SRGB_EXT:
+      case GL_SRGB8_EXT:
+      case GL_SRGB_ALPHA_EXT:
+      case GL_SRGB8_ALPHA8_EXT:
+      case GL_SLUMINANCE_ALPHA_EXT:
+      case GL_SLUMINANCE8_ALPHA8_EXT:
+      case GL_SLUMINANCE_EXT:
+      case GL_SLUMINANCE8_EXT:
+      case GL_COMPRESSED_SRGB_EXT:
+      case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+      case GL_COMPRESSED_SRGB_ALPHA_EXT:
+      case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+      case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+      case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+      case GL_COMPRESSED_SLUMINANCE_EXT:
+      case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
+#endif /* FEATURE_EXT_texture_sRGB */
+      case GL_COMPRESSED_RED_RGTC1:
+      case GL_COMPRESSED_SIGNED_RED_RGTC1:
+      case GL_COMPRESSED_RG_RGTC2:
+      case GL_COMPRESSED_SIGNED_RG_RGTC2:
+      case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
+      case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
+      case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
+      case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
+      case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
+      /* generic integer formats */
+      case GL_RED_INTEGER_EXT:
+      case GL_GREEN_INTEGER_EXT:
+      case GL_BLUE_INTEGER_EXT:
+      case GL_ALPHA_INTEGER_EXT:
+      case GL_RGB_INTEGER_EXT:
+      case GL_RGBA_INTEGER_EXT:
+      case GL_BGR_INTEGER_EXT:
+      case GL_BGRA_INTEGER_EXT:
+      case GL_LUMINANCE_INTEGER_EXT:
+      case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+      /* sized integer formats */
+      case GL_RGBA32UI_EXT:
+      case GL_RGB32UI_EXT:
+      case GL_ALPHA32UI_EXT:
+      case GL_INTENSITY32UI_EXT:
+      case GL_LUMINANCE32UI_EXT:
+      case GL_LUMINANCE_ALPHA32UI_EXT:
+      case GL_RGBA16UI_EXT:
+      case GL_RGB16UI_EXT:
+      case GL_ALPHA16UI_EXT:
+      case GL_INTENSITY16UI_EXT:
+      case GL_LUMINANCE16UI_EXT:
+      case GL_LUMINANCE_ALPHA16UI_EXT:
+      case GL_RGBA8UI_EXT:
+      case GL_RGB8UI_EXT:
+      case GL_ALPHA8UI_EXT:
+      case GL_INTENSITY8UI_EXT:
+      case GL_LUMINANCE8UI_EXT:
+      case GL_LUMINANCE_ALPHA8UI_EXT:
+      case GL_RGBA32I_EXT:
+      case GL_RGB32I_EXT:
+      case GL_ALPHA32I_EXT:
+      case GL_INTENSITY32I_EXT:
+      case GL_LUMINANCE32I_EXT:
+      case GL_LUMINANCE_ALPHA32I_EXT:
+      case GL_RGBA16I_EXT:
+      case GL_RGB16I_EXT:
+      case GL_ALPHA16I_EXT:
+      case GL_INTENSITY16I_EXT:
+      case GL_LUMINANCE16I_EXT:
+      case GL_LUMINANCE_ALPHA16I_EXT:
+      case GL_RGBA8I_EXT:
+      case GL_RGB8I_EXT:
+      case GL_ALPHA8I_EXT:
+      case GL_INTENSITY8I_EXT:
+      case GL_LUMINANCE8I_EXT:
+      case GL_LUMINANCE_ALPHA8I_EXT:
+      /* signed, normalized texture formats */
+      case GL_RED_SNORM:
+      case GL_R8_SNORM:
+      case GL_R16_SNORM:
+      case GL_RG_SNORM:
+      case GL_RG8_SNORM:
+      case GL_RG16_SNORM:
+      case GL_RGB_SNORM:
+      case GL_RGB8_SNORM:
+      case GL_RGB16_SNORM:
+      case GL_RGBA_SNORM:
+      case GL_RGBA8_SNORM:
+      case GL_RGBA16_SNORM:
+      case GL_ALPHA_SNORM:
+      case GL_ALPHA8_SNORM:
+      case GL_ALPHA16_SNORM:
+      case GL_LUMINANCE_SNORM:
+      case GL_LUMINANCE8_SNORM:
+      case GL_LUMINANCE16_SNORM:
+      case GL_LUMINANCE_ALPHA_SNORM:
+      case GL_LUMINANCE8_ALPHA8_SNORM:
+      case GL_LUMINANCE16_ALPHA16_SNORM:
+      case GL_INTENSITY_SNORM:
+      case GL_INTENSITY8_SNORM:
+      case GL_INTENSITY16_SNORM:
+      case GL_RGB9_E5:
+      case GL_R11F_G11F_B10F:
+         return GL_TRUE;
+      case GL_YCBCR_MESA:  /* not considered to be RGB */
+         /* fall-through */
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a color index format.
+ */
+GLboolean
+_mesa_is_index_format(GLenum format)
+{
+   switch (format) {
+      case GL_COLOR_INDEX:
+      case GL_COLOR_INDEX1_EXT:
+      case GL_COLOR_INDEX2_EXT:
+      case GL_COLOR_INDEX4_EXT:
+      case GL_COLOR_INDEX8_EXT:
+      case GL_COLOR_INDEX12_EXT:
+      case GL_COLOR_INDEX16_EXT:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a depth component format.
+ */
+GLboolean
+_mesa_is_depth_format(GLenum format)
+{
+   switch (format) {
+      case GL_DEPTH_COMPONENT:
+      case GL_DEPTH_COMPONENT16:
+      case GL_DEPTH_COMPONENT24:
+      case GL_DEPTH_COMPONENT32:
+      case GL_DEPTH_COMPONENT32F:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a stencil format.
+ */
+GLboolean
+_mesa_is_stencil_format(GLenum format)
+{
+   switch (format) {
+      case GL_STENCIL_INDEX:
+      case GL_DEPTH_STENCIL:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a YCbCr format.
+ */
+GLboolean
+_mesa_is_ycbcr_format(GLenum format)
+{
+   switch (format) {
+      case GL_YCBCR_MESA:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a depth+stencil format.
+ */
+GLboolean
+_mesa_is_depthstencil_format(GLenum format)
+{
+   switch (format) {
+      case GL_DEPTH24_STENCIL8_EXT:
+      case GL_DEPTH_STENCIL_EXT:
+      case GL_DEPTH32F_STENCIL8:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a depth or stencil format.
+ */
+GLboolean
+_mesa_is_depth_or_stencil_format(GLenum format)
+{
+   switch (format) {
+      case GL_DEPTH_COMPONENT:
+      case GL_DEPTH_COMPONENT16:
+      case GL_DEPTH_COMPONENT24:
+      case GL_DEPTH_COMPONENT32:
+      case GL_STENCIL_INDEX:
+      case GL_STENCIL_INDEX1_EXT:
+      case GL_STENCIL_INDEX4_EXT:
+      case GL_STENCIL_INDEX8_EXT:
+      case GL_STENCIL_INDEX16_EXT:
+      case GL_DEPTH_STENCIL_EXT:
+      case GL_DEPTH24_STENCIL8_EXT:
+      case GL_DEPTH_COMPONENT32F:
+      case GL_DEPTH32F_STENCIL8:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given image format is a dudv format.
+ */
+GLboolean
+_mesa_is_dudv_format(GLenum format)
+{
+   switch (format) {
+      case GL_DUDV_ATI:
+      case GL_DU8DV8_ATI:
+         return GL_TRUE;
+      default:
+         return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if the given format is an integer (non-normalized) format.
+ */
+GLboolean
+_mesa_is_integer_format(GLenum format)
+{
+   switch (format) {
+   /* generic integer formats */
+   case GL_RED_INTEGER_EXT:
+   case GL_GREEN_INTEGER_EXT:
+   case GL_BLUE_INTEGER_EXT:
+   case GL_ALPHA_INTEGER_EXT:
+   case GL_RGB_INTEGER_EXT:
+   case GL_RGBA_INTEGER_EXT:
+   case GL_BGR_INTEGER_EXT:
+   case GL_BGRA_INTEGER_EXT:
+   case GL_LUMINANCE_INTEGER_EXT:
+   case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+   /* specific integer formats */
+   case GL_RGBA32UI_EXT:
+   case GL_RGB32UI_EXT:
+   case GL_ALPHA32UI_EXT:
+   case GL_INTENSITY32UI_EXT:
+   case GL_LUMINANCE32UI_EXT:
+   case GL_LUMINANCE_ALPHA32UI_EXT:
+   case GL_RGBA16UI_EXT:
+   case GL_RGB16UI_EXT:
+   case GL_ALPHA16UI_EXT:
+   case GL_INTENSITY16UI_EXT:
+   case GL_LUMINANCE16UI_EXT:
+   case GL_LUMINANCE_ALPHA16UI_EXT:
+   case GL_RGBA8UI_EXT:
+   case GL_RGB8UI_EXT:
+   case GL_ALPHA8UI_EXT:
+   case GL_INTENSITY8UI_EXT:
+   case GL_LUMINANCE8UI_EXT:
+   case GL_LUMINANCE_ALPHA8UI_EXT:
+   case GL_RGBA32I_EXT:
+   case GL_RGB32I_EXT:
+   case GL_ALPHA32I_EXT:
+   case GL_INTENSITY32I_EXT:
+   case GL_LUMINANCE32I_EXT:
+   case GL_LUMINANCE_ALPHA32I_EXT:
+   case GL_RGBA16I_EXT:
+   case GL_RGB16I_EXT:
+   case GL_ALPHA16I_EXT:
+   case GL_INTENSITY16I_EXT:
+   case GL_LUMINANCE16I_EXT:
+   case GL_LUMINANCE_ALPHA16I_EXT:
+   case GL_RGBA8I_EXT:
+   case GL_RGB8I_EXT:
+   case GL_ALPHA8I_EXT:
+   case GL_INTENSITY8I_EXT:
+   case GL_LUMINANCE8I_EXT:
+   case GL_LUMINANCE_ALPHA8I_EXT:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+/**
+ * Test if an image format is a supported compressed format.
+ * \param format the internal format token provided by the user.
+ * \return GL_TRUE if compressed, GL_FALSE if uncompressed
+ */
+GLboolean
+_mesa_is_compressed_format(struct gl_context *ctx, GLenum format)
+{
+   switch (format) {
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+      return ctx->Extensions.EXT_texture_compression_s3tc;
+   case GL_RGB_S3TC:
+   case GL_RGB4_S3TC:
+   case GL_RGBA_S3TC:
+   case GL_RGBA4_S3TC:
+      return ctx->Extensions.S3_s3tc;
+   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+      return ctx->Extensions.EXT_texture_sRGB
+         && ctx->Extensions.EXT_texture_compression_s3tc;
+   case GL_COMPRESSED_RGB_FXT1_3DFX:
+   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+      return ctx->Extensions.TDFX_texture_compression_FXT1;
+   case GL_COMPRESSED_RED_RGTC1:
+   case GL_COMPRESSED_SIGNED_RED_RGTC1:
+   case GL_COMPRESSED_RG_RGTC2:
+   case GL_COMPRESSED_SIGNED_RG_RGTC2:
+      return ctx->Extensions.ARB_texture_compression_rgtc;
+   case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
+   case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
+   case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
+   case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
+      return ctx->Extensions.EXT_texture_compression_latc;
+   case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
+      return ctx->Extensions.ATI_texture_compression_3dc;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+/**
+ * Return the address of a specific pixel in an image (1D, 2D or 3D).
+ *
+ * Pixel unpacking/packing parameters are observed according to \p packing.
+ *
+ * \param dimensions either 1, 2 or 3 to indicate dimensionality of image
+ * \param image  starting address of image data
+ * \param width  the image width
+ * \param height  theimage height
+ * \param format  the pixel format
+ * \param type  the pixel data type
+ * \param packing  the pixelstore attributes
+ * \param img  which image in the volume (0 for 1D or 2D images)
+ * \param row  row of pixel in the image (0 for 1D images)
+ * \param column column of pixel in the image
+ * 
+ * \return address of pixel on success, or NULL on error.
+ *
+ * \sa gl_pixelstore_attrib.
+ */
+GLvoid *
+_mesa_image_address( GLuint dimensions,
+                     const struct gl_pixelstore_attrib *packing,
+                     const GLvoid *image,
+                     GLsizei width, GLsizei height,
+                     GLenum format, GLenum type,
+                     GLint img, GLint row, GLint column )
+{
+   GLint alignment;        /* 1, 2 or 4 */
+   GLint pixels_per_row;
+   GLint rows_per_image;
+   GLint skiprows;
+   GLint skippixels;
+   GLint skipimages;       /* for 3-D volume images */
+   GLubyte *pixel_addr;
+
+   ASSERT(dimensions >= 1 && dimensions <= 3);
+
+   alignment = packing->Alignment;
+   if (packing->RowLength > 0) {
+      pixels_per_row = packing->RowLength;
+   }
+   else {
+      pixels_per_row = width;
+   }
+   if (packing->ImageHeight > 0) {
+      rows_per_image = packing->ImageHeight;
+   }
+   else {
+      rows_per_image = height;
+   }
+
+   skippixels = packing->SkipPixels;
+   /* Note: SKIP_ROWS _is_ used for 1D images */
+   skiprows = packing->SkipRows;
+   /* Note: SKIP_IMAGES is only used for 3D images */
+   skipimages = (dimensions == 3) ? packing->SkipImages : 0;
+
+   if (type == GL_BITMAP) {
+      /* BITMAP data */
+      GLint comp_per_pixel;   /* components per pixel */
+      GLint bytes_per_comp;   /* bytes per component */
+      GLint bytes_per_row;
+      GLint bytes_per_image;
+
+      /* Compute bytes per component */
+      bytes_per_comp = _mesa_sizeof_packed_type( type );
+      if (bytes_per_comp < 0) {
+         return NULL;
+      }
+
+      /* Compute number of components per pixel */
+      comp_per_pixel = _mesa_components_in_format( format );
+      if (comp_per_pixel < 0) {
+         return NULL;
+      }
+
+      bytes_per_row = alignment
+                    * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
+
+      bytes_per_image = bytes_per_row * rows_per_image;
+
+      pixel_addr = (GLubyte *) image
+                 + (skipimages + img) * bytes_per_image
+                 + (skiprows + row) * bytes_per_row
+                 + (skippixels + column) / 8;
+   }
+   else {
+      /* Non-BITMAP data */
+      GLint bytes_per_pixel, bytes_per_row, remainder, bytes_per_image;
+      GLint topOfImage;
+
+      bytes_per_pixel = _mesa_bytes_per_pixel( format, type );
+
+      /* The pixel type and format should have been error checked earlier */
+      assert(bytes_per_pixel > 0);
+
+      bytes_per_row = pixels_per_row * bytes_per_pixel;
+      remainder = bytes_per_row % alignment;
+      if (remainder > 0)
+         bytes_per_row += (alignment - remainder);
+
+      ASSERT(bytes_per_row % alignment == 0);
+
+      bytes_per_image = bytes_per_row * rows_per_image;
+
+      if (packing->Invert) {
+         /* set pixel_addr to the last row */
+         topOfImage = bytes_per_row * (height - 1);
+         bytes_per_row = -bytes_per_row;
+      }
+      else {
+         topOfImage = 0;
+      }
+
+      /* compute final pixel address */
+      pixel_addr = (GLubyte *) image
+                 + (skipimages + img) * bytes_per_image
+                 + topOfImage
+                 + (skiprows + row) * bytes_per_row
+                 + (skippixels + column) * bytes_per_pixel;
+   }
+
+   return (GLvoid *) pixel_addr;
+}
+
+
+GLvoid *
+_mesa_image_address1d( const struct gl_pixelstore_attrib *packing,
+                       const GLvoid *image,
+                       GLsizei width,
+                       GLenum format, GLenum type,
+                       GLint column )
+{
+   return _mesa_image_address(1, packing, image, width, 1,
+                              format, type, 0, 0, column);
+}
+
+
+GLvoid *
+_mesa_image_address2d( const struct gl_pixelstore_attrib *packing,
+                       const GLvoid *image,
+                       GLsizei width, GLsizei height,
+                       GLenum format, GLenum type,
+                       GLint row, GLint column )
+{
+   return _mesa_image_address(2, packing, image, width, height,
+                              format, type, 0, row, column);
+}
+
+
+GLvoid *
+_mesa_image_address3d( const struct gl_pixelstore_attrib *packing,
+                       const GLvoid *image,
+                       GLsizei width, GLsizei height,
+                       GLenum format, GLenum type,
+                       GLint img, GLint row, GLint column )
+{
+   return _mesa_image_address(3, packing, image, width, height,
+                              format, type, img, row, column);
+}
+
+
+
+/**
+ * Compute the stride (in bytes) between image rows.
+ *
+ * \param packing the pixelstore attributes
+ * \param width image width.
+ * \param format pixel format.
+ * \param type pixel data type.
+ * 
+ * \return the stride in bytes for the given parameters, or -1 if error
+ */
+GLint
+_mesa_image_row_stride( const struct gl_pixelstore_attrib *packing,
+                        GLint width, GLenum format, GLenum type )
+{
+   GLint bytesPerRow, remainder;
+
+   ASSERT(packing);
+
+   if (type == GL_BITMAP) {
+      if (packing->RowLength == 0) {
+         bytesPerRow = (width + 7) / 8;
+      }
+      else {
+         bytesPerRow = (packing->RowLength + 7) / 8;
+      }
+   }
+   else {
+      /* Non-BITMAP data */
+      const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
+      if (bytesPerPixel <= 0)
+         return -1;  /* error */
+      if (packing->RowLength == 0) {
+         bytesPerRow = bytesPerPixel * width;
+      }
+      else {
+         bytesPerRow = bytesPerPixel * packing->RowLength;
+      }
+   }
+
+   remainder = bytesPerRow % packing->Alignment;
+   if (remainder > 0) {
+      bytesPerRow += (packing->Alignment - remainder);
+   }
+
+   if (packing->Invert) {
+      /* negate the bytes per row (negative row stride) */
+      bytesPerRow = -bytesPerRow;
+   }
+
+   return bytesPerRow;
+}
+
+
+/*
+ * Compute the stride between images in a 3D texture (in bytes) for the given
+ * pixel packing parameters and image width, format and type.
+ */
+GLint
+_mesa_image_image_stride( const struct gl_pixelstore_attrib *packing,
+                          GLint width, GLint height,
+                          GLenum format, GLenum type )
+{
+   GLint bytesPerRow, bytesPerImage, remainder;
+
+   ASSERT(packing);
+
+   if (type == GL_BITMAP) {
+      if (packing->RowLength == 0) {
+         bytesPerRow = (width + 7) / 8;
+      }
+      else {
+         bytesPerRow = (packing->RowLength + 7) / 8;
+      }
+   }
+   else {
+      const GLint bytesPerPixel = _mesa_bytes_per_pixel(format, type);
+
+      if (bytesPerPixel <= 0)
+         return -1;  /* error */
+      if (packing->RowLength == 0) {
+         bytesPerRow = bytesPerPixel * width;
+      }
+      else {
+         bytesPerRow = bytesPerPixel * packing->RowLength;
+      }
+   }
+
+   remainder = bytesPerRow % packing->Alignment;
+   if (remainder > 0)
+      bytesPerRow += (packing->Alignment - remainder);
+
+   if (packing->ImageHeight == 0)
+      bytesPerImage = bytesPerRow * height;
+   else
+      bytesPerImage = bytesPerRow * packing->ImageHeight;
+
+   return bytesPerImage;
+}
+
+
+
+/**
+ * "Expand" a bitmap from 1-bit per pixel to 8-bits per pixel.
+ * This is typically used to convert a bitmap into a GLubyte/pixel texture.
+ * "On" bits will set texels to \p onValue.
+ * "Off" bits will not modify texels.
+ * \param width  src bitmap width in pixels
+ * \param height  src bitmap height in pixels
+ * \param unpack  bitmap unpacking state
+ * \param bitmap  the src bitmap data
+ * \param destBuffer  start of dest buffer
+ * \param destStride  row stride in dest buffer
+ * \param onValue  if bit is 1, set destBuffer pixel to this value
+ */
+void
+_mesa_expand_bitmap(GLsizei width, GLsizei height,
+                    const struct gl_pixelstore_attrib *unpack,
+                    const GLubyte *bitmap,
+                    GLubyte *destBuffer, GLint destStride,
+                    GLubyte onValue)
+{
+   const GLubyte *srcRow = (const GLubyte *)
+      _mesa_image_address2d(unpack, bitmap, width, height,
+                            GL_COLOR_INDEX, GL_BITMAP, 0, 0);
+   const GLint srcStride = _mesa_image_row_stride(unpack, width,
+                                                  GL_COLOR_INDEX, GL_BITMAP);
+   GLint row, col;
+
+#define SET_PIXEL(COL, ROW) \
+   destBuffer[(ROW) * destStride + (COL)] = onValue;
+
+   for (row = 0; row < height; row++) {
+      const GLubyte *src = srcRow;
+
+      if (unpack->LsbFirst) {
+         /* Lsb first */
+         GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
+         for (col = 0; col < width; col++) {
+
+            if (*src & mask) {
+               SET_PIXEL(col, row);
+            }
+
+            if (mask == 128U) {
+               src++;
+               mask = 1U;
+            }
+            else {
+               mask = mask << 1;
+            }
+         }
+
+         /* get ready for next row */
+         if (mask != 1)
+            src++;
+      }
+      else {
+         /* Msb first */
+         GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
+         for (col = 0; col < width; col++) {
+
+            if (*src & mask) {
+               SET_PIXEL(col, row);
+            }
+
+            if (mask == 1U) {
+               src++;
+               mask = 128U;
+            }
+            else {
+               mask = mask >> 1;
+            }
+         }
+
+         /* get ready for next row */
+         if (mask != 128)
+            src++;
+      }
+
+      srcRow += srcStride;
+   } /* row */
+
+#undef SET_PIXEL
+}
+
+
+
+
+/**
+ * Convert an array of RGBA colors from one datatype to another.
+ * NOTE: src may equal dst.  In that case, we use a temporary buffer.
+ */
+void
+_mesa_convert_colors(GLenum srcType, const GLvoid *src,
+                     GLenum dstType, GLvoid *dst,
+                     GLuint count, const GLubyte mask[])
+{
+   GLuint tempBuffer[MAX_WIDTH][4];
+   const GLboolean useTemp = (src == dst);
+
+   ASSERT(srcType != dstType);
+
+   switch (srcType) {
+   case GL_UNSIGNED_BYTE:
+      if (dstType == GL_UNSIGNED_SHORT) {
+         const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
+         GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
+         GLuint i;
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst2[i][RCOMP] = UBYTE_TO_USHORT(src1[i][RCOMP]);
+               dst2[i][GCOMP] = UBYTE_TO_USHORT(src1[i][GCOMP]);
+               dst2[i][BCOMP] = UBYTE_TO_USHORT(src1[i][BCOMP]);
+               dst2[i][ACOMP] = UBYTE_TO_USHORT(src1[i][ACOMP]);
+            }
+         }
+         if (useTemp)
+            memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
+      }
+      else {
+         const GLubyte (*src1)[4] = (const GLubyte (*)[4]) src;
+         GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
+         GLuint i;
+         ASSERT(dstType == GL_FLOAT);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst4[i][RCOMP] = UBYTE_TO_FLOAT(src1[i][RCOMP]);
+               dst4[i][GCOMP] = UBYTE_TO_FLOAT(src1[i][GCOMP]);
+               dst4[i][BCOMP] = UBYTE_TO_FLOAT(src1[i][BCOMP]);
+               dst4[i][ACOMP] = UBYTE_TO_FLOAT(src1[i][ACOMP]);
+            }
+         }
+         if (useTemp)
+            memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
+      }
+      break;
+   case GL_UNSIGNED_SHORT:
+      if (dstType == GL_UNSIGNED_BYTE) {
+         const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
+         GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
+         GLuint i;
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst1[i][RCOMP] = USHORT_TO_UBYTE(src2[i][RCOMP]);
+               dst1[i][GCOMP] = USHORT_TO_UBYTE(src2[i][GCOMP]);
+               dst1[i][BCOMP] = USHORT_TO_UBYTE(src2[i][BCOMP]);
+               dst1[i][ACOMP] = USHORT_TO_UBYTE(src2[i][ACOMP]);
+            }
+         }
+         if (useTemp)
+            memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
+      }
+      else {
+         const GLushort (*src2)[4] = (const GLushort (*)[4]) src;
+         GLfloat (*dst4)[4] = (GLfloat (*)[4]) (useTemp ? tempBuffer : dst);
+         GLuint i;
+         ASSERT(dstType == GL_FLOAT);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst4[i][RCOMP] = USHORT_TO_FLOAT(src2[i][RCOMP]);
+               dst4[i][GCOMP] = USHORT_TO_FLOAT(src2[i][GCOMP]);
+               dst4[i][BCOMP] = USHORT_TO_FLOAT(src2[i][BCOMP]);
+               dst4[i][ACOMP] = USHORT_TO_FLOAT(src2[i][ACOMP]);
+            }
+         }
+         if (useTemp)
+            memcpy(dst, tempBuffer, count * 4 * sizeof(GLfloat));
+      }
+      break;
+   case GL_FLOAT:
+      if (dstType == GL_UNSIGNED_BYTE) {
+         const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
+         GLubyte (*dst1)[4] = (GLubyte (*)[4]) (useTemp ? tempBuffer : dst);
+         GLuint i;
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][RCOMP], src4[i][RCOMP]);
+               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][GCOMP], src4[i][GCOMP]);
+               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][BCOMP], src4[i][BCOMP]);
+               UNCLAMPED_FLOAT_TO_UBYTE(dst1[i][ACOMP], src4[i][ACOMP]);
+            }
+         }
+         if (useTemp)
+            memcpy(dst, tempBuffer, count * 4 * sizeof(GLubyte));
+      }
+      else {
+         const GLfloat (*src4)[4] = (const GLfloat (*)[4]) src;
+         GLushort (*dst2)[4] = (GLushort (*)[4]) (useTemp ? tempBuffer : dst);
+         GLuint i;
+         ASSERT(dstType == GL_UNSIGNED_SHORT);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][RCOMP], src4[i][RCOMP]);
+               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][GCOMP], src4[i][GCOMP]);
+               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][BCOMP], src4[i][BCOMP]);
+               UNCLAMPED_FLOAT_TO_USHORT(dst2[i][ACOMP], src4[i][ACOMP]);
+            }
+         }
+         if (useTemp)
+            memcpy(dst, tempBuffer, count * 4 * sizeof(GLushort));
+      }
+      break;
+   default:
+      _mesa_problem(NULL, "Invalid datatype in _mesa_convert_colors");
+   }
+}
+
+
+
+
+/**
+ * Perform basic clipping for glDrawPixels.  The image's position and size
+ * and the unpack SkipPixels and SkipRows are adjusted so that the image
+ * region is entirely within the window and scissor bounds.
+ * NOTE: this will only work when glPixelZoom is (1, 1) or (1, -1).
+ * If Pixel.ZoomY is -1, *destY will be changed to be the first row which
+ * we'll actually write.  Beforehand, *destY-1 is the first drawing row.
+ *
+ * \return  GL_TRUE if image is ready for drawing or
+ *          GL_FALSE if image was completely clipped away (draw nothing)
+ */
+GLboolean
+_mesa_clip_drawpixels(const struct gl_context *ctx,
+                      GLint *destX, GLint *destY,
+                      GLsizei *width, GLsizei *height,
+                      struct gl_pixelstore_attrib *unpack)
+{
+   const struct gl_framebuffer *buffer = ctx->DrawBuffer;
+
+   if (unpack->RowLength == 0) {
+      unpack->RowLength = *width;
+   }
+
+   ASSERT(ctx->Pixel.ZoomX == 1.0F);
+   ASSERT(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F);
+
+   /* left clipping */
+   if (*destX < buffer->_Xmin) {
+      unpack->SkipPixels += (buffer->_Xmin - *destX);
+      *width -= (buffer->_Xmin - *destX);
+      *destX = buffer->_Xmin;
+   }
+   /* right clipping */
+   if (*destX + *width > buffer->_Xmax)
+      *width -= (*destX + *width - buffer->_Xmax);
+
+   if (*width <= 0)
+      return GL_FALSE;
+
+   if (ctx->Pixel.ZoomY == 1.0F) {
+      /* bottom clipping */
+      if (*destY < buffer->_Ymin) {
+         unpack->SkipRows += (buffer->_Ymin - *destY);
+         *height -= (buffer->_Ymin - *destY);
+         *destY = buffer->_Ymin;
+      }
+      /* top clipping */
+      if (*destY + *height > buffer->_Ymax)
+         *height -= (*destY + *height - buffer->_Ymax);
+   }
+   else { /* upside down */
+      /* top clipping */
+      if (*destY > buffer->_Ymax) {
+         unpack->SkipRows += (*destY - buffer->_Ymax);
+         *height -= (*destY - buffer->_Ymax);
+         *destY = buffer->_Ymax;
+      }
+      /* bottom clipping */
+      if (*destY - *height < buffer->_Ymin)
+         *height -= (buffer->_Ymin - (*destY - *height));
+      /* adjust destY so it's the first row to write to */
+      (*destY)--;
+   }
+
+   if (*height <= 0)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Perform clipping for glReadPixels.  The image's window position
+ * and size, and the pack skipPixels, skipRows and rowLength are adjusted
+ * so that the image region is entirely within the window bounds.
+ * Note: this is different from _mesa_clip_drawpixels() in that the
+ * scissor box is ignored, and we use the bounds of the current readbuffer
+ * surface.
+ *
+ * \return  GL_TRUE if region to read is in bounds
+ *          GL_FALSE if region is completely out of bounds (nothing to read)
+ */
+GLboolean
+_mesa_clip_readpixels(const struct gl_context *ctx,
+                      GLint *srcX, GLint *srcY,
+                      GLsizei *width, GLsizei *height,
+                      struct gl_pixelstore_attrib *pack)
+{
+   const struct gl_framebuffer *buffer = ctx->ReadBuffer;
+
+   if (pack->RowLength == 0) {
+      pack->RowLength = *width;
+   }
+
+   /* left clipping */
+   if (*srcX < 0) {
+      pack->SkipPixels += (0 - *srcX);
+      *width -= (0 - *srcX);
+      *srcX = 0;
+   }
+   /* right clipping */
+   if (*srcX + *width > (GLsizei) buffer->Width)
+      *width -= (*srcX + *width - buffer->Width);
+
+   if (*width <= 0)
+      return GL_FALSE;
+
+   /* bottom clipping */
+   if (*srcY < 0) {
+      pack->SkipRows += (0 - *srcY);
+      *height -= (0 - *srcY);
+      *srcY = 0;
+   }
+   /* top clipping */
+   if (*srcY + *height > (GLsizei) buffer->Height)
+      *height -= (*srcY + *height - buffer->Height);
+
+   if (*height <= 0)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Do clipping for a glCopyTexSubImage call.
+ * The framebuffer source region might extend outside the framebuffer
+ * bounds.  Clip the source region against the framebuffer bounds and
+ * adjust the texture/dest position and size accordingly.
+ *
+ * \return GL_FALSE if region is totally clipped, GL_TRUE otherwise.
+ */
+GLboolean
+_mesa_clip_copytexsubimage(const struct gl_context *ctx,
+                           GLint *destX, GLint *destY,
+                           GLint *srcX, GLint *srcY,
+                           GLsizei *width, GLsizei *height)
+{
+   const struct gl_framebuffer *fb = ctx->ReadBuffer;
+   const GLint srcX0 = *srcX, srcY0 = *srcY;
+
+   if (_mesa_clip_to_region(0, 0, fb->Width, fb->Height,
+                            srcX, srcY, width, height)) {
+      *destX = *destX + *srcX - srcX0;
+      *destY = *destY + *srcY - srcY0;
+
+      return GL_TRUE;
+   }
+   else {
+      return GL_FALSE;
+   }
+}
+
+
+
+/**
+ * Clip the rectangle defined by (x, y, width, height) against the bounds
+ * specified by [xmin, xmax) and [ymin, ymax).
+ * \return GL_FALSE if rect is totally clipped, GL_TRUE otherwise.
+ */
+GLboolean
+_mesa_clip_to_region(GLint xmin, GLint ymin,
+                     GLint xmax, GLint ymax,
+                     GLint *x, GLint *y,
+                     GLsizei *width, GLsizei *height )
+{
+   /* left clipping */
+   if (*x < xmin) {
+      *width -= (xmin - *x);
+      *x = xmin;
+   }
+
+   /* right clipping */
+   if (*x + *width > xmax)
+      *width -= (*x + *width - xmax);
+
+   if (*width <= 0)
+      return GL_FALSE;
+
+   /* bottom (or top) clipping */
+   if (*y < ymin) {
+      *height -= (ymin - *y);
+      *y = ymin;
+   }
+
+   /* top (or bottom) clipping */
+   if (*y + *height > ymax)
+      *height -= (*y + *height - ymax);
+
+   if (*height <= 0)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Clip dst coords against Xmax (or Ymax).
+ */
+static INLINE void
+clip_right_or_top(GLint *srcX0, GLint *srcX1,
+                  GLint *dstX0, GLint *dstX1,
+                  GLint maxValue)
+{
+   GLfloat t, bias;
+
+   if (*dstX1 > maxValue) {
+      /* X1 outside right edge */
+      ASSERT(*dstX0 < maxValue); /* X0 should be inside right edge */
+      t = (GLfloat) (maxValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
+      /* chop off [t, 1] part */
+      ASSERT(t >= 0.0 && t <= 1.0);
+      *dstX1 = maxValue;
+      bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
+      *srcX1 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
+   }
+   else if (*dstX0 > maxValue) {
+      /* X0 outside right edge */
+      ASSERT(*dstX1 < maxValue); /* X1 should be inside right edge */
+      t = (GLfloat) (maxValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
+      /* chop off [t, 1] part */
+      ASSERT(t >= 0.0 && t <= 1.0);
+      *dstX0 = maxValue;
+      bias = (*srcX0 < *srcX1) ? -0.5F : 0.5F;
+      *srcX0 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
+   }
+}
+
+
+/**
+ * Clip dst coords against Xmin (or Ymin).
+ */
+static INLINE void
+clip_left_or_bottom(GLint *srcX0, GLint *srcX1,
+                    GLint *dstX0, GLint *dstX1,
+                    GLint minValue)
+{
+   GLfloat t, bias;
+
+   if (*dstX0 < minValue) {
+      /* X0 outside left edge */
+      ASSERT(*dstX1 > minValue); /* X1 should be inside left edge */
+      t = (GLfloat) (minValue - *dstX0) / (GLfloat) (*dstX1 - *dstX0);
+      /* chop off [0, t] part */
+      ASSERT(t >= 0.0 && t <= 1.0);
+      *dstX0 = minValue;
+      bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F; /* flipped??? */
+      *srcX0 = *srcX0 + (GLint) (t * (*srcX1 - *srcX0) + bias);
+   }
+   else if (*dstX1 < minValue) {
+      /* X1 outside left edge */
+      ASSERT(*dstX0 > minValue); /* X0 should be inside left edge */
+      t = (GLfloat) (minValue - *dstX1) / (GLfloat) (*dstX0 - *dstX1);
+      /* chop off [0, t] part */
+      ASSERT(t >= 0.0 && t <= 1.0);
+      *dstX1 = minValue;
+      bias = (*srcX0 < *srcX1) ? 0.5F : -0.5F;
+      *srcX1 = *srcX1 + (GLint) (t * (*srcX0 - *srcX1) + bias);
+   }
+}
+
+
+/**
+ * Do clipping of blit src/dest rectangles.
+ * The dest rect is clipped against both the buffer bounds and scissor bounds.
+ * The src rect is just clipped against the buffer bounds.
+ *
+ * When either the src or dest rect is clipped, the other is also clipped
+ * proportionately!
+ *
+ * Note that X0 need not be less than X1 (same for Y) for either the source
+ * and dest rects.  That makes the clipping a little trickier.
+ *
+ * \return GL_TRUE if anything is left to draw, GL_FALSE if totally clipped
+ */
+GLboolean
+_mesa_clip_blit(struct gl_context *ctx,
+                GLint *srcX0, GLint *srcY0, GLint *srcX1, GLint *srcY1,
+                GLint *dstX0, GLint *dstY0, GLint *dstX1, GLint *dstY1)
+{
+   const GLint srcXmin = 0;
+   const GLint srcXmax = ctx->ReadBuffer->Width;
+   const GLint srcYmin = 0;
+   const GLint srcYmax = ctx->ReadBuffer->Height;
+
+   /* these include scissor bounds */
+   const GLint dstXmin = ctx->DrawBuffer->_Xmin;
+   const GLint dstXmax = ctx->DrawBuffer->_Xmax;
+   const GLint dstYmin = ctx->DrawBuffer->_Ymin;
+   const GLint dstYmax = ctx->DrawBuffer->_Ymax;
+
+   /*
+   printf("PreClipX:  src: %d .. %d  dst: %d .. %d\n",
+          *srcX0, *srcX1, *dstX0, *dstX1);
+   printf("PreClipY:  src: %d .. %d  dst: %d .. %d\n",
+          *srcY0, *srcY1, *dstY0, *dstY1);
+   */
+
+   /* trivial rejection tests */
+   if (*dstX0 == *dstX1)
+      return GL_FALSE; /* no width */
+   if (*dstX0 <= dstXmin && *dstX1 <= dstXmin)
+      return GL_FALSE; /* totally out (left) of bounds */
+   if (*dstX0 >= dstXmax && *dstX1 >= dstXmax)
+      return GL_FALSE; /* totally out (right) of bounds */
+
+   if (*dstY0 == *dstY1)
+      return GL_FALSE;
+   if (*dstY0 <= dstYmin && *dstY1 <= dstYmin)
+      return GL_FALSE;
+   if (*dstY0 >= dstYmax && *dstY1 >= dstYmax)
+      return GL_FALSE;
+
+   if (*srcX0 == *srcX1)
+      return GL_FALSE;
+   if (*srcX0 <= srcXmin && *srcX1 <= srcXmin)
+      return GL_FALSE;
+   if (*srcX0 >= srcXmax && *srcX1 >= srcXmax)
+      return GL_FALSE;
+
+   if (*srcY0 == *srcY1)
+      return GL_FALSE;
+   if (*srcY0 <= srcYmin && *srcY1 <= srcYmin)
+      return GL_FALSE;
+   if (*srcY0 >= srcYmax && *srcY1 >= srcYmax)
+      return GL_FALSE;
+
+   /*
+    * dest clip
+    */
+   clip_right_or_top(srcX0, srcX1, dstX0, dstX1, dstXmax);
+   clip_right_or_top(srcY0, srcY1, dstY0, dstY1, dstYmax);
+   clip_left_or_bottom(srcX0, srcX1, dstX0, dstX1, dstXmin);
+   clip_left_or_bottom(srcY0, srcY1, dstY0, dstY1, dstYmin);
+
+   /*
+    * src clip (just swap src/dst values from above)
+    */
+   clip_right_or_top(dstX0, dstX1, srcX0, srcX1, srcXmax);
+   clip_right_or_top(dstY0, dstY1, srcY0, srcY1, srcYmax);
+   clip_left_or_bottom(dstX0, dstX1, srcX0, srcX1, srcXmin);
+   clip_left_or_bottom(dstY0, dstY1, srcY0, srcY1, srcYmin);
+
+   /*
+   printf("PostClipX: src: %d .. %d  dst: %d .. %d\n",
+          *srcX0, *srcX1, *dstX0, *dstX1);
+   printf("PostClipY: src: %d .. %d  dst: %d .. %d\n",
+          *srcY0, *srcY1, *dstY0, *dstY1);
+   */
+
+   ASSERT(*dstX0 >= dstXmin);
+   ASSERT(*dstX0 <= dstXmax);
+   ASSERT(*dstX1 >= dstXmin);
+   ASSERT(*dstX1 <= dstXmax);
+
+   ASSERT(*dstY0 >= dstYmin);
+   ASSERT(*dstY0 <= dstYmax);
+   ASSERT(*dstY1 >= dstYmin);
+   ASSERT(*dstY1 <= dstYmax);
+
+   ASSERT(*srcX0 >= srcXmin);
+   ASSERT(*srcX0 <= srcXmax);
+   ASSERT(*srcX1 >= srcXmin);
+   ASSERT(*srcX1 <= srcXmax);
+
+   ASSERT(*srcY0 >= srcYmin);
+   ASSERT(*srcY0 <= srcYmax);
+   ASSERT(*srcY1 >= srcYmin);
+   ASSERT(*srcY1 <= srcYmax);
+
+   return GL_TRUE;
+}