randrproto mesa xserver git update 4 aug 2011

1 files changed, 841 insertions, 822 deletions

diff --git a/mesalib/src/gallium/auxiliary/util/u_format.h b/mesalib/src/gallium/auxiliary/util/u_format.h
index 6e9b6902e..566fa79e7 100644
--- a/mesalib/src/gallium/auxiliary/util/u_format.h
+++ b/mesalib/src/gallium/auxiliary/util/u_format.h
@@ -1,822 +1,841 @@
-/**************************************************************************

- *

- * Copyright 2009-2010 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, sub license, 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 (including the

- * next paragraph) 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 NON-INFRINGEMENT.

- * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.

- *

- **************************************************************************/

-

-

-#ifndef U_FORMAT_H

-#define U_FORMAT_H

-

-

-#include "pipe/p_format.h"

-#include "util/u_debug.h"

-

-#ifdef __cplusplus

-extern "C" {

-#endif

-

-

-/**

- * Describe how to pack/unpack pixels into/from the prescribed format.

- *

- * XXX: This could be renamed to something like util_format_pack, or broke down

- * in flags inside util_format_block that said exactly what we want.

- */

-enum util_format_layout {

-   /**

-    * Formats with util_format_block::width == util_format_block::height == 1

-    * that can be described as an ordinary data structure.

-    */

-   UTIL_FORMAT_LAYOUT_PLAIN = 0,

-

-   /**

-    * Formats with sub-sampled channels.

-    *

-    * This is for formats like YV12 where there is less than one sample per

-    * pixel.

-    */

-   UTIL_FORMAT_LAYOUT_SUBSAMPLED = 3,

-

-   /**

-    * S3 Texture Compression formats.

-    */

-   UTIL_FORMAT_LAYOUT_S3TC = 4,

-

-   /**

-    * Red-Green Texture Compression formats.

-    */

-   UTIL_FORMAT_LAYOUT_RGTC = 5,

-

-   /**

-    * Everything else that doesn't fit in any of the above layouts.

-    */

-   UTIL_FORMAT_LAYOUT_OTHER = 6

-};

-

-

-struct util_format_block

-{

-   /** Block width in pixels */

-   unsigned width;

-   

-   /** Block height in pixels */

-   unsigned height;

-

-   /** Block size in bits */

-   unsigned bits;

-};

-

-

-enum util_format_type {

-   UTIL_FORMAT_TYPE_VOID = 0,

-   UTIL_FORMAT_TYPE_UNSIGNED = 1,

-   UTIL_FORMAT_TYPE_SIGNED = 2,

-   UTIL_FORMAT_TYPE_FIXED = 3,

-   UTIL_FORMAT_TYPE_FLOAT = 4

-};

-

-

-enum util_format_swizzle {

-   UTIL_FORMAT_SWIZZLE_X = 0,

-   UTIL_FORMAT_SWIZZLE_Y = 1,

-   UTIL_FORMAT_SWIZZLE_Z = 2,

-   UTIL_FORMAT_SWIZZLE_W = 3,

-   UTIL_FORMAT_SWIZZLE_0 = 4,

-   UTIL_FORMAT_SWIZZLE_1 = 5,

-   UTIL_FORMAT_SWIZZLE_NONE = 6

-};

-

-

-enum util_format_colorspace {

-   UTIL_FORMAT_COLORSPACE_RGB = 0,

-   UTIL_FORMAT_COLORSPACE_SRGB = 1,

-   UTIL_FORMAT_COLORSPACE_YUV = 2,

-   UTIL_FORMAT_COLORSPACE_ZS = 3

-};

-

-

-struct util_format_channel_description

-{

-   unsigned type:6;

-   unsigned normalized:1;

-   unsigned size:9;

-};

-

-

-struct util_format_description

-{

-   enum pipe_format format;

-

-   const char *name;

-

-   /**

-    * Short name, striped of the prefix, lower case.

-    */

-   const char *short_name;

-

-   /**

-    * Pixel block dimensions.

-    */

-   struct util_format_block block;

-

-   enum util_format_layout layout;

-

-   /**

-    * The number of channels.

-    */

-   unsigned nr_channels:3;

-

-   /**

-    * Whether all channels have the same number of (whole) bytes.

-    */

-   unsigned is_array:1;

-

-   /**

-    * Whether the pixel format can be described as a bitfield structure.

-    *

-    * In particular:

-    * - pixel depth must be 8, 16, or 32 bits;

-    * - all channels must be unsigned, signed, or void

-    */

-   unsigned is_bitmask:1;

-

-   /**

-    * Whether channels have mixed types (ignoring UTIL_FORMAT_TYPE_VOID).

-    */

-   unsigned is_mixed:1;

-

-   /**

-    * Input channel description.

-    *

-    * Only valid for UTIL_FORMAT_LAYOUT_PLAIN formats.

-    */

-   struct util_format_channel_description channel[4];

-

-   /**

-    * Output channel swizzle.

-    *

-    * The order is either:

-    * - RGBA

-    * - YUV(A)

-    * - ZS

-    * depending on the colorspace.

-    */

-   unsigned char swizzle[4];

-

-   /**

-    * Colorspace transformation.

-    */

-   enum util_format_colorspace colorspace;

-

-   /**

-    * Unpack pixel blocks to R8G8B8A8_UNORM.

-    * Note: strides are in bytes.

-    *

-    * Only defined for non-depth-stencil formats.

-    */

-   void

-   (*unpack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,

-                         const uint8_t *src, unsigned src_stride,

-                         unsigned width, unsigned height);

-

-   /**

-    * Pack pixel blocks from R8G8B8A8_UNORM.

-    * Note: strides are in bytes.

-    *

-    * Only defined for non-depth-stencil formats.

-    */

-   void

-   (*pack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,

-                       const uint8_t *src, unsigned src_stride,

-                       unsigned width, unsigned height);

-

-   /**

-    * Fetch a single pixel (i, j) from a block.

-    *

-    * XXX: Only defined for a very few select formats.

-    */

-   void

-   (*fetch_rgba_8unorm)(uint8_t *dst,

-                        const uint8_t *src,

-                        unsigned i, unsigned j);

-

-   /**

-    * Unpack pixel blocks to R32G32B32A32_FLOAT.

-    * Note: strides are in bytes.

-    *

-    * Only defined for non-depth-stencil formats.

-    */

-   void

-   (*unpack_rgba_float)(float *dst, unsigned dst_stride,

-                        const uint8_t *src, unsigned src_stride,

-                        unsigned width, unsigned height);

-

-   /**

-    * Pack pixel blocks from R32G32B32A32_FLOAT.

-    * Note: strides are in bytes.

-    *

-    * Only defined for non-depth-stencil formats.

-    */

-   void

-   (*pack_rgba_float)(uint8_t *dst, unsigned dst_stride,

-                      const float *src, unsigned src_stride,

-                      unsigned width, unsigned height);

-

-   /**

-    * Fetch a single pixel (i, j) from a block.

-    *

-    * Only defined for non-depth-stencil formats.

-    */

-   void

-   (*fetch_rgba_float)(float *dst,

-                       const uint8_t *src,

-                       unsigned i, unsigned j);

-

-   /**

-    * Unpack pixels to Z32_UNORM.

-    * Note: strides are in bytes.

-    *

-    * Only defined for depth formats.

-    */

-   void

-   (*unpack_z_32unorm)(uint32_t *dst, unsigned dst_stride,

-                       const uint8_t *src, unsigned src_stride,

-                       unsigned width, unsigned height);

-

-   /**

-    * Pack pixels from Z32_FLOAT.

-    * Note: strides are in bytes.

-    *

-    * Only defined for depth formats.

-    */

-   void

-   (*pack_z_32unorm)(uint8_t *dst, unsigned dst_stride,

-                     const uint32_t *src, unsigned src_stride,

-                     unsigned width, unsigned height);

-

-   /**

-    * Unpack pixels to Z32_FLOAT.

-    * Note: strides are in bytes.

-    *

-    * Only defined for depth formats.

-    */

-   void

-   (*unpack_z_float)(float *dst, unsigned dst_stride,

-                     const uint8_t *src, unsigned src_stride,

-                     unsigned width, unsigned height);

-

-   /**

-    * Pack pixels from Z32_FLOAT.

-    * Note: strides are in bytes.

-    *

-    * Only defined for depth formats.

-    */

-   void

-   (*pack_z_float)(uint8_t *dst, unsigned dst_stride,

-                   const float *src, unsigned src_stride,

-                   unsigned width, unsigned height);

-

-   /**

-    * Unpack pixels to S8_USCALED.

-    * Note: strides are in bytes.

-    *

-    * Only defined for stencil formats.

-    */

-   void

-   (*unpack_s_8uscaled)(uint8_t *dst, unsigned dst_stride,

-                        const uint8_t *src, unsigned src_stride,

-                        unsigned width, unsigned height);

-

-   /**

-    * Pack pixels from S8_USCALED.

-    * Note: strides are in bytes.

-    *

-    * Only defined for stencil formats.

-    */

-   void

-   (*pack_s_8uscaled)(uint8_t *dst, unsigned dst_stride,

-                      const uint8_t *src, unsigned src_stride,

-                      unsigned width, unsigned height);

-

-};

-

-

-extern const struct util_format_description 

-util_format_description_table[];

-

-

-const struct util_format_description *

-util_format_description(enum pipe_format format);

-

-

-/*

- * Format query functions.

- */

-

-static INLINE const char *

-util_format_name(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return "PIPE_FORMAT_???";

-   }

-

-   return desc->name;

-}

-

-static INLINE const char *

-util_format_short_name(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return "???";

-   }

-

-   return desc->short_name;

-}

-

-/**

- * Whether this format is plain, see UTIL_FORMAT_LAYOUT_PLAIN for more info.

- */

-static INLINE boolean

-util_format_is_plain(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   if (!format) {

-      return FALSE;

-   }

-

-   return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ? TRUE : FALSE;

-}

-

-static INLINE boolean 

-util_format_is_compressed(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return FALSE;

-   }

-

-   switch (desc->layout) {

-   case UTIL_FORMAT_LAYOUT_S3TC:

-   case UTIL_FORMAT_LAYOUT_RGTC:

-      /* XXX add other formats in the future */

-      return TRUE;

-   default:

-      return FALSE;

-   }

-}

-

-static INLINE boolean 

-util_format_is_s3tc(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return FALSE;

-   }

-

-   return desc->layout == UTIL_FORMAT_LAYOUT_S3TC ? TRUE : FALSE;

-}

-

-static INLINE boolean 

-util_format_is_depth_or_stencil(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return FALSE;

-   }

-

-   return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ? TRUE : FALSE;

-}

-

-static INLINE boolean 

-util_format_is_depth_and_stencil(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return FALSE;

-   }

-

-   if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS) {

-      return FALSE;

-   }

-

-   return (desc->swizzle[0] != UTIL_FORMAT_SWIZZLE_NONE &&

-           desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE) ? TRUE : FALSE;

-}

-

-

-/**

- * Give the RGBA colormask of the channels that can be represented in this

- * format.

- *

- * That is, the channels whose values are preserved.

- */

-static INLINE unsigned

-util_format_colormask(const struct util_format_description *desc)

-{

-   unsigned colormask;

-   unsigned chan;

-

-   switch (desc->colorspace) {

-   case UTIL_FORMAT_COLORSPACE_RGB:

-   case UTIL_FORMAT_COLORSPACE_SRGB:

-   case UTIL_FORMAT_COLORSPACE_YUV:

-      colormask = 0;

-      for (chan = 0; chan < 4; ++chan) {

-         if (desc->swizzle[chan] < 4) {

-            colormask |= (1 << chan);

-         }

-      }

-      return colormask;

-   case UTIL_FORMAT_COLORSPACE_ZS:

-      return 0;

-   default:

-      assert(0);

-      return 0;

-   }

-}

-

-

-boolean

-util_format_is_float(enum pipe_format format);

-

-

-/**

- * Whether the src format can be blitted to destation format with a simple

- * memcpy.

- */

-boolean

-util_is_format_compatible(const struct util_format_description *src_desc,

-                          const struct util_format_description *dst_desc);

-

-/**

- * Whether the format is supported by Gallium for the given bindings.

- * This covers S3TC textures and floating-point render targets.

- */

-boolean

-util_format_is_supported(enum pipe_format format, unsigned bind);

-

-/**

- * Whether this format is a rgab8 variant.

- *

- * That is, any format that matches the

- *

- *   PIPE_FORMAT_?8?8?8?8_UNORM

- */

-static INLINE boolean

-util_format_is_rgba8_variant(const struct util_format_description *desc)

-{

-   unsigned chan;

-

-   if(desc->block.width != 1 ||

-      desc->block.height != 1 ||

-      desc->block.bits != 32)

-      return FALSE;

-

-   for(chan = 0; chan < 4; ++chan) {

-      if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&

-         desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)

-         return FALSE;

-      if(desc->channel[chan].size != 8)

-         return FALSE;

-   }

-

-   return TRUE;

-}

-

-

-/**

- * Return total bits needed for the pixel format per block.

- */

-static INLINE uint

-util_format_get_blocksizebits(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return 0;

-   }

-

-   return desc->block.bits;

-}

-

-/**

- * Return bytes per block (not pixel) for the given format.

- */

-static INLINE uint

-util_format_get_blocksize(enum pipe_format format)

-{

-   uint bits = util_format_get_blocksizebits(format);

-

-   assert(bits % 8 == 0);

-

-   return bits / 8;

-}

-

-static INLINE uint

-util_format_get_blockwidth(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return 1;

-   }

-

-   return desc->block.width;

-}

-

-static INLINE uint

-util_format_get_blockheight(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(desc);

-   if (!desc) {

-      return 1;

-   }

-

-   return desc->block.height;

-}

-

-static INLINE unsigned

-util_format_get_nblocksx(enum pipe_format format,

-                         unsigned x)

-{

-   unsigned blockwidth = util_format_get_blockwidth(format);

-   return (x + blockwidth - 1) / blockwidth;

-}

-

-static INLINE unsigned

-util_format_get_nblocksy(enum pipe_format format,

-                         unsigned y)

-{

-   unsigned blockheight = util_format_get_blockheight(format);

-   return (y + blockheight - 1) / blockheight;

-}

-

-static INLINE unsigned

-util_format_get_nblocks(enum pipe_format format,

-                        unsigned width,

-                        unsigned height)

-{

-   return util_format_get_nblocksx(format, width) * util_format_get_nblocksy(format, height);

-}

-

-static INLINE size_t

-util_format_get_stride(enum pipe_format format,

-                       unsigned width)

-{

-   return util_format_get_nblocksx(format, width) * util_format_get_blocksize(format);

-}

-

-static INLINE size_t

-util_format_get_2d_size(enum pipe_format format,

-                        size_t stride,

-                        unsigned height)

-{

-   return util_format_get_nblocksy(format, height) * stride;

-}

-

-static INLINE uint

-util_format_get_component_bits(enum pipe_format format,

-                               enum util_format_colorspace colorspace,

-                               uint component)

-{

-   const struct util_format_description *desc = util_format_description(format);

-   enum util_format_colorspace desc_colorspace;

-

-   assert(format);

-   if (!format) {

-      return 0;

-   }

-

-   assert(component < 4);

-

-   /* Treat RGB and SRGB as equivalent. */

-   if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {

-      colorspace = UTIL_FORMAT_COLORSPACE_RGB;

-   }

-   if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {

-      desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;

-   } else {

-      desc_colorspace = desc->colorspace;

-   }

-

-   if (desc_colorspace != colorspace) {

-      return 0;

-   }

-

-   switch (desc->swizzle[component]) {

-   case UTIL_FORMAT_SWIZZLE_X:

-      return desc->channel[0].size;

-   case UTIL_FORMAT_SWIZZLE_Y:

-      return desc->channel[1].size;

-   case UTIL_FORMAT_SWIZZLE_Z:

-      return desc->channel[2].size;

-   case UTIL_FORMAT_SWIZZLE_W:

-      return desc->channel[3].size;

-   default:

-      return 0;

-   }

-}

-

-static INLINE boolean

-util_format_has_alpha(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-

-   assert(format);

-   if (!format) {

-      return FALSE;

-   }

-

-   switch (desc->colorspace) {

-   case UTIL_FORMAT_COLORSPACE_RGB:

-   case UTIL_FORMAT_COLORSPACE_SRGB:

-      return desc->swizzle[3] != UTIL_FORMAT_SWIZZLE_1;

-   case UTIL_FORMAT_COLORSPACE_YUV:

-      return FALSE;

-   case UTIL_FORMAT_COLORSPACE_ZS:

-      return FALSE;

-   default:

-      assert(0);

-      return FALSE;

-   }

-}

-

-/**

- * Given a linear RGB colorspace format, return the corresponding SRGB

- * format, or PIPE_FORMAT_NONE if none.

- */

-static INLINE enum pipe_format

-util_format_srgb(enum pipe_format format)

-{

-   switch (format) {

-   case PIPE_FORMAT_L8_UNORM:

-      return PIPE_FORMAT_L8_SRGB;

-   case PIPE_FORMAT_L8A8_UNORM:

-      return PIPE_FORMAT_L8A8_SRGB;

-   case PIPE_FORMAT_R8G8B8_UNORM:

-      return PIPE_FORMAT_R8G8B8_SRGB;

-   case PIPE_FORMAT_A8B8G8R8_UNORM:

-      return PIPE_FORMAT_A8B8G8R8_SRGB;

-   case PIPE_FORMAT_X8B8G8R8_UNORM:

-      return PIPE_FORMAT_X8B8G8R8_SRGB;

-   case PIPE_FORMAT_B8G8R8A8_UNORM:

-      return PIPE_FORMAT_B8G8R8A8_SRGB;

-   case PIPE_FORMAT_B8G8R8X8_UNORM:

-      return PIPE_FORMAT_B8G8R8X8_SRGB;

-   case PIPE_FORMAT_A8R8G8B8_UNORM:

-      return PIPE_FORMAT_A8R8G8B8_SRGB;

-   case PIPE_FORMAT_X8R8G8B8_UNORM:

-      return PIPE_FORMAT_X8R8G8B8_SRGB;

-   case PIPE_FORMAT_DXT1_RGB:

-      return PIPE_FORMAT_DXT1_SRGB;

-   case PIPE_FORMAT_DXT1_RGBA:

-      return PIPE_FORMAT_DXT1_SRGBA;

-   case PIPE_FORMAT_DXT3_RGBA:

-      return PIPE_FORMAT_DXT3_SRGBA;

-   case PIPE_FORMAT_DXT5_RGBA:

-      return PIPE_FORMAT_DXT5_SRGBA;

-   default:

-      return PIPE_FORMAT_NONE;

-   }

-}

-

-/**

- * Given an sRGB format, return the corresponding linear colorspace format.

- * For non sRGB formats, return the format unchanged.

- */

-static INLINE enum pipe_format

-util_format_linear(enum pipe_format format)

-{

-   switch (format) {

-   case PIPE_FORMAT_L8_SRGB:

-      return PIPE_FORMAT_L8_UNORM;

-   case PIPE_FORMAT_L8A8_SRGB:

-      return PIPE_FORMAT_L8A8_UNORM;

-   case PIPE_FORMAT_R8G8B8_SRGB:

-      return PIPE_FORMAT_R8G8B8_UNORM;

-   case PIPE_FORMAT_A8B8G8R8_SRGB:

-      return PIPE_FORMAT_A8B8G8R8_UNORM;

-   case PIPE_FORMAT_X8B8G8R8_SRGB:

-      return PIPE_FORMAT_X8B8G8R8_UNORM;

-   case PIPE_FORMAT_B8G8R8A8_SRGB:

-      return PIPE_FORMAT_B8G8R8A8_UNORM;

-   case PIPE_FORMAT_B8G8R8X8_SRGB:

-      return PIPE_FORMAT_B8G8R8X8_UNORM;

-   case PIPE_FORMAT_A8R8G8B8_SRGB:

-      return PIPE_FORMAT_A8R8G8B8_UNORM;

-   case PIPE_FORMAT_X8R8G8B8_SRGB:

-      return PIPE_FORMAT_X8R8G8B8_UNORM;

-   case PIPE_FORMAT_DXT1_SRGB:

-      return PIPE_FORMAT_DXT1_RGB;

-   case PIPE_FORMAT_DXT1_SRGBA:

-      return PIPE_FORMAT_DXT1_RGBA;

-   case PIPE_FORMAT_DXT3_SRGBA:

-      return PIPE_FORMAT_DXT3_RGBA;

-   case PIPE_FORMAT_DXT5_SRGBA:

-      return PIPE_FORMAT_DXT5_RGBA;

-   default:

-      return format;

-   }

-}

-

-/**

- * Return the number of components stored.

- * Formats with block size != 1x1 will always have 1 component (the block).

- */

-static INLINE unsigned

-util_format_get_nr_components(enum pipe_format format)

-{

-   const struct util_format_description *desc = util_format_description(format);

-   return desc->nr_channels;

-}

-

-/*

- * Format access functions.

- */

-

-void

-util_format_read_4f(enum pipe_format format,

-                    float *dst, unsigned dst_stride, 

-                    const void *src, unsigned src_stride, 

-                    unsigned x, unsigned y, unsigned w, unsigned h);

-

-void

-util_format_write_4f(enum pipe_format format,

-                     const float *src, unsigned src_stride, 

-                     void *dst, unsigned dst_stride, 

-                     unsigned x, unsigned y, unsigned w, unsigned h);

-

-void

-util_format_read_4ub(enum pipe_format format,

-                     uint8_t *dst, unsigned dst_stride, 

-                     const void *src, unsigned src_stride, 

-                     unsigned x, unsigned y, unsigned w, unsigned h);

-

-void

-util_format_write_4ub(enum pipe_format format,

-                      const uint8_t *src, unsigned src_stride, 

-                      void *dst, unsigned dst_stride, 

-                      unsigned x, unsigned y, unsigned w, unsigned h);

-

-/*

- * Generic format conversion;

- */

-

-boolean

-util_format_fits_8unorm(const struct util_format_description *format_desc);

-

-void

-util_format_translate(enum pipe_format dst_format,

-                      void *dst, unsigned dst_stride,

-                      unsigned dst_x, unsigned dst_y,

-                      enum pipe_format src_format,

-                      const void *src, unsigned src_stride,

-                      unsigned src_x, unsigned src_y,

-                      unsigned width, unsigned height);

-

-#ifdef __cplusplus

-} // extern "C" {

-#endif

-

-#endif /* ! U_FORMAT_H */

+/**************************************************************************
+ *
+ * Copyright 2009-2010 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+
+#ifndef U_FORMAT_H
+#define U_FORMAT_H
+
+
+#include "pipe/p_format.h"
+#include "util/u_debug.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * Describe how to pack/unpack pixels into/from the prescribed format.
+ *
+ * XXX: This could be renamed to something like util_format_pack, or broke down
+ * in flags inside util_format_block that said exactly what we want.
+ */
+enum util_format_layout {
+   /**
+    * Formats with util_format_block::width == util_format_block::height == 1
+    * that can be described as an ordinary data structure.
+    */
+   UTIL_FORMAT_LAYOUT_PLAIN = 0,
+
+   /**
+    * Formats with sub-sampled channels.
+    *
+    * This is for formats like YV12 where there is less than one sample per
+    * pixel.
+    */
+   UTIL_FORMAT_LAYOUT_SUBSAMPLED = 3,
+
+   /**
+    * S3 Texture Compression formats.
+    */
+   UTIL_FORMAT_LAYOUT_S3TC = 4,
+
+   /**
+    * Red-Green Texture Compression formats.
+    */
+   UTIL_FORMAT_LAYOUT_RGTC = 5,
+
+   /**
+    * Everything else that doesn't fit in any of the above layouts.
+    */
+   UTIL_FORMAT_LAYOUT_OTHER = 6
+};
+
+
+struct util_format_block
+{
+   /** Block width in pixels */
+   unsigned width;
+   
+   /** Block height in pixels */
+   unsigned height;
+
+   /** Block size in bits */
+   unsigned bits;
+};
+
+
+enum util_format_type {
+   UTIL_FORMAT_TYPE_VOID = 0,
+   UTIL_FORMAT_TYPE_UNSIGNED = 1,
+   UTIL_FORMAT_TYPE_SIGNED = 2,
+   UTIL_FORMAT_TYPE_FIXED = 3,
+   UTIL_FORMAT_TYPE_FLOAT = 4
+};
+
+
+enum util_format_swizzle {
+   UTIL_FORMAT_SWIZZLE_X = 0,
+   UTIL_FORMAT_SWIZZLE_Y = 1,
+   UTIL_FORMAT_SWIZZLE_Z = 2,
+   UTIL_FORMAT_SWIZZLE_W = 3,
+   UTIL_FORMAT_SWIZZLE_0 = 4,
+   UTIL_FORMAT_SWIZZLE_1 = 5,
+   UTIL_FORMAT_SWIZZLE_NONE = 6
+};
+
+
+enum util_format_colorspace {
+   UTIL_FORMAT_COLORSPACE_RGB = 0,
+   UTIL_FORMAT_COLORSPACE_SRGB = 1,
+   UTIL_FORMAT_COLORSPACE_YUV = 2,
+   UTIL_FORMAT_COLORSPACE_ZS = 3
+};
+
+
+struct util_format_channel_description
+{
+   unsigned type:6;
+   unsigned normalized:1;
+   unsigned size:9;
+};
+
+
+struct util_format_description
+{
+   enum pipe_format format;
+
+   const char *name;
+
+   /**
+    * Short name, striped of the prefix, lower case.
+    */
+   const char *short_name;
+
+   /**
+    * Pixel block dimensions.
+    */
+   struct util_format_block block;
+
+   enum util_format_layout layout;
+
+   /**
+    * The number of channels.
+    */
+   unsigned nr_channels:3;
+
+   /**
+    * Whether all channels have the same number of (whole) bytes.
+    */
+   unsigned is_array:1;
+
+   /**
+    * Whether the pixel format can be described as a bitfield structure.
+    *
+    * In particular:
+    * - pixel depth must be 8, 16, or 32 bits;
+    * - all channels must be unsigned, signed, or void
+    */
+   unsigned is_bitmask:1;
+
+   /**
+    * Whether channels have mixed types (ignoring UTIL_FORMAT_TYPE_VOID).
+    */
+   unsigned is_mixed:1;
+
+   /**
+    * Input channel description.
+    *
+    * Only valid for UTIL_FORMAT_LAYOUT_PLAIN formats.
+    */
+   struct util_format_channel_description channel[4];
+
+   /**
+    * Output channel swizzle.
+    *
+    * The order is either:
+    * - RGBA
+    * - YUV(A)
+    * - ZS
+    * depending on the colorspace.
+    */
+   unsigned char swizzle[4];
+
+   /**
+    * Colorspace transformation.
+    */
+   enum util_format_colorspace colorspace;
+
+   /**
+    * Unpack pixel blocks to R8G8B8A8_UNORM.
+    * Note: strides are in bytes.
+    *
+    * Only defined for non-depth-stencil formats.
+    */
+   void
+   (*unpack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,
+                         const uint8_t *src, unsigned src_stride,
+                         unsigned width, unsigned height);
+
+   /**
+    * Pack pixel blocks from R8G8B8A8_UNORM.
+    * Note: strides are in bytes.
+    *
+    * Only defined for non-depth-stencil formats.
+    */
+   void
+   (*pack_rgba_8unorm)(uint8_t *dst, unsigned dst_stride,
+                       const uint8_t *src, unsigned src_stride,
+                       unsigned width, unsigned height);
+
+   /**
+    * Fetch a single pixel (i, j) from a block.
+    *
+    * XXX: Only defined for a very few select formats.
+    */
+   void
+   (*fetch_rgba_8unorm)(uint8_t *dst,
+                        const uint8_t *src,
+                        unsigned i, unsigned j);
+
+   /**
+    * Unpack pixel blocks to R32G32B32A32_FLOAT.
+    * Note: strides are in bytes.
+    *
+    * Only defined for non-depth-stencil formats.
+    */
+   void
+   (*unpack_rgba_float)(float *dst, unsigned dst_stride,
+                        const uint8_t *src, unsigned src_stride,
+                        unsigned width, unsigned height);
+
+   /**
+    * Pack pixel blocks from R32G32B32A32_FLOAT.
+    * Note: strides are in bytes.
+    *
+    * Only defined for non-depth-stencil formats.
+    */
+   void
+   (*pack_rgba_float)(uint8_t *dst, unsigned dst_stride,
+                      const float *src, unsigned src_stride,
+                      unsigned width, unsigned height);
+
+   /**
+    * Fetch a single pixel (i, j) from a block.
+    *
+    * Only defined for non-depth-stencil formats.
+    */
+   void
+   (*fetch_rgba_float)(float *dst,
+                       const uint8_t *src,
+                       unsigned i, unsigned j);
+
+   /**
+    * Unpack pixels to Z32_UNORM.
+    * Note: strides are in bytes.
+    *
+    * Only defined for depth formats.
+    */
+   void
+   (*unpack_z_32unorm)(uint32_t *dst, unsigned dst_stride,
+                       const uint8_t *src, unsigned src_stride,
+                       unsigned width, unsigned height);
+
+   /**
+    * Pack pixels from Z32_FLOAT.
+    * Note: strides are in bytes.
+    *
+    * Only defined for depth formats.
+    */
+   void
+   (*pack_z_32unorm)(uint8_t *dst, unsigned dst_stride,
+                     const uint32_t *src, unsigned src_stride,
+                     unsigned width, unsigned height);
+
+   /**
+    * Unpack pixels to Z32_FLOAT.
+    * Note: strides are in bytes.
+    *
+    * Only defined for depth formats.
+    */
+   void
+   (*unpack_z_float)(float *dst, unsigned dst_stride,
+                     const uint8_t *src, unsigned src_stride,
+                     unsigned width, unsigned height);
+
+   /**
+    * Pack pixels from Z32_FLOAT.
+    * Note: strides are in bytes.
+    *
+    * Only defined for depth formats.
+    */
+   void
+   (*pack_z_float)(uint8_t *dst, unsigned dst_stride,
+                   const float *src, unsigned src_stride,
+                   unsigned width, unsigned height);
+
+   /**
+    * Unpack pixels to S8_USCALED.
+    * Note: strides are in bytes.
+    *
+    * Only defined for stencil formats.
+    */
+   void
+   (*unpack_s_8uscaled)(uint8_t *dst, unsigned dst_stride,
+                        const uint8_t *src, unsigned src_stride,
+                        unsigned width, unsigned height);
+
+   /**
+    * Pack pixels from S8_USCALED.
+    * Note: strides are in bytes.
+    *
+    * Only defined for stencil formats.
+    */
+   void
+   (*pack_s_8uscaled)(uint8_t *dst, unsigned dst_stride,
+                      const uint8_t *src, unsigned src_stride,
+                      unsigned width, unsigned height);
+
+};
+
+
+extern const struct util_format_description 
+util_format_description_table[];
+
+
+const struct util_format_description *
+util_format_description(enum pipe_format format);
+
+
+/*
+ * Format query functions.
+ */
+
+static INLINE const char *
+util_format_name(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return "PIPE_FORMAT_???";
+   }
+
+   return desc->name;
+}
+
+static INLINE const char *
+util_format_short_name(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return "???";
+   }
+
+   return desc->short_name;
+}
+
+/**
+ * Whether this format is plain, see UTIL_FORMAT_LAYOUT_PLAIN for more info.
+ */
+static INLINE boolean
+util_format_is_plain(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   if (!format) {
+      return FALSE;
+   }
+
+   return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ? TRUE : FALSE;
+}
+
+static INLINE boolean 
+util_format_is_compressed(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return FALSE;
+   }
+
+   switch (desc->layout) {
+   case UTIL_FORMAT_LAYOUT_S3TC:
+   case UTIL_FORMAT_LAYOUT_RGTC:
+      /* XXX add other formats in the future */
+      return TRUE;
+   default:
+      return FALSE;
+   }
+}
+
+static INLINE boolean 
+util_format_is_s3tc(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return FALSE;
+   }
+
+   return desc->layout == UTIL_FORMAT_LAYOUT_S3TC ? TRUE : FALSE;
+}
+
+static INLINE boolean 
+util_format_is_depth_or_stencil(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return FALSE;
+   }
+
+   return desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS ? TRUE : FALSE;
+}
+
+static INLINE boolean 
+util_format_is_depth_and_stencil(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return FALSE;
+   }
+
+   if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS) {
+      return FALSE;
+   }
+
+   return (desc->swizzle[0] != UTIL_FORMAT_SWIZZLE_NONE &&
+           desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE) ? TRUE : FALSE;
+}
+
+
+/**
+ * Give the RGBA colormask of the channels that can be represented in this
+ * format.
+ *
+ * That is, the channels whose values are preserved.
+ */
+static INLINE unsigned
+util_format_colormask(const struct util_format_description *desc)
+{
+   unsigned colormask;
+   unsigned chan;
+
+   switch (desc->colorspace) {
+   case UTIL_FORMAT_COLORSPACE_RGB:
+   case UTIL_FORMAT_COLORSPACE_SRGB:
+   case UTIL_FORMAT_COLORSPACE_YUV:
+      colormask = 0;
+      for (chan = 0; chan < 4; ++chan) {
+         if (desc->swizzle[chan] < 4) {
+            colormask |= (1 << chan);
+         }
+      }
+      return colormask;
+   case UTIL_FORMAT_COLORSPACE_ZS:
+      return 0;
+   default:
+      assert(0);
+      return 0;
+   }
+}
+
+
+boolean
+util_format_is_float(enum pipe_format format);
+
+
+/**
+ * Whether the src format can be blitted to destation format with a simple
+ * memcpy.
+ */
+boolean
+util_is_format_compatible(const struct util_format_description *src_desc,
+                          const struct util_format_description *dst_desc);
+
+/**
+ * Whether the format is supported by Gallium for the given bindings.
+ * This covers S3TC textures and floating-point render targets.
+ */
+boolean
+util_format_is_supported(enum pipe_format format, unsigned bind);
+
+/**
+ * Whether this format is a rgab8 variant.
+ *
+ * That is, any format that matches the
+ *
+ *   PIPE_FORMAT_?8?8?8?8_UNORM
+ */
+static INLINE boolean
+util_format_is_rgba8_variant(const struct util_format_description *desc)
+{
+   unsigned chan;
+
+   if(desc->block.width != 1 ||
+      desc->block.height != 1 ||
+      desc->block.bits != 32)
+      return FALSE;
+
+   for(chan = 0; chan < 4; ++chan) {
+      if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&
+         desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)
+         return FALSE;
+      if(desc->channel[chan].size != 8)
+         return FALSE;
+   }
+
+   return TRUE;
+}
+
+
+/**
+ * Return total bits needed for the pixel format per block.
+ */
+static INLINE uint
+util_format_get_blocksizebits(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return 0;
+   }
+
+   return desc->block.bits;
+}
+
+/**
+ * Return bytes per block (not pixel) for the given format.
+ */
+static INLINE uint
+util_format_get_blocksize(enum pipe_format format)
+{
+   uint bits = util_format_get_blocksizebits(format);
+
+   assert(bits % 8 == 0);
+
+   return bits / 8;
+}
+
+static INLINE uint
+util_format_get_blockwidth(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return 1;
+   }
+
+   return desc->block.width;
+}
+
+static INLINE uint
+util_format_get_blockheight(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return 1;
+   }
+
+   return desc->block.height;
+}
+
+static INLINE unsigned
+util_format_get_nblocksx(enum pipe_format format,
+                         unsigned x)
+{
+   unsigned blockwidth = util_format_get_blockwidth(format);
+   return (x + blockwidth - 1) / blockwidth;
+}
+
+static INLINE unsigned
+util_format_get_nblocksy(enum pipe_format format,
+                         unsigned y)
+{
+   unsigned blockheight = util_format_get_blockheight(format);
+   return (y + blockheight - 1) / blockheight;
+}
+
+static INLINE unsigned
+util_format_get_nblocks(enum pipe_format format,
+                        unsigned width,
+                        unsigned height)
+{
+   return util_format_get_nblocksx(format, width) * util_format_get_nblocksy(format, height);
+}
+
+static INLINE size_t
+util_format_get_stride(enum pipe_format format,
+                       unsigned width)
+{
+   return util_format_get_nblocksx(format, width) * util_format_get_blocksize(format);
+}
+
+static INLINE size_t
+util_format_get_2d_size(enum pipe_format format,
+                        size_t stride,
+                        unsigned height)
+{
+   return util_format_get_nblocksy(format, height) * stride;
+}
+
+static INLINE uint
+util_format_get_component_bits(enum pipe_format format,
+                               enum util_format_colorspace colorspace,
+                               uint component)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   enum util_format_colorspace desc_colorspace;
+
+   assert(format);
+   if (!format) {
+      return 0;
+   }
+
+   assert(component < 4);
+
+   /* Treat RGB and SRGB as equivalent. */
+   if (colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
+      colorspace = UTIL_FORMAT_COLORSPACE_RGB;
+   }
+   if (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
+      desc_colorspace = UTIL_FORMAT_COLORSPACE_RGB;
+   } else {
+      desc_colorspace = desc->colorspace;
+   }
+
+   if (desc_colorspace != colorspace) {
+      return 0;
+   }
+
+   switch (desc->swizzle[component]) {
+   case UTIL_FORMAT_SWIZZLE_X:
+      return desc->channel[0].size;
+   case UTIL_FORMAT_SWIZZLE_Y:
+      return desc->channel[1].size;
+   case UTIL_FORMAT_SWIZZLE_Z:
+      return desc->channel[2].size;
+   case UTIL_FORMAT_SWIZZLE_W:
+      return desc->channel[3].size;
+   default:
+      return 0;
+   }
+}
+
+static INLINE boolean
+util_format_has_alpha(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(format);
+   if (!format) {
+      return FALSE;
+   }
+
+   switch (desc->colorspace) {
+   case UTIL_FORMAT_COLORSPACE_RGB:
+   case UTIL_FORMAT_COLORSPACE_SRGB:
+      return desc->swizzle[3] != UTIL_FORMAT_SWIZZLE_1;
+   case UTIL_FORMAT_COLORSPACE_YUV:
+      return FALSE;
+   case UTIL_FORMAT_COLORSPACE_ZS:
+      return FALSE;
+   default:
+      assert(0);
+      return FALSE;
+   }
+}
+
+/**
+ * Given a linear RGB colorspace format, return the corresponding SRGB
+ * format, or PIPE_FORMAT_NONE if none.
+ */
+static INLINE enum pipe_format
+util_format_srgb(enum pipe_format format)
+{
+   switch (format) {
+   case PIPE_FORMAT_L8_UNORM:
+      return PIPE_FORMAT_L8_SRGB;
+   case PIPE_FORMAT_L8A8_UNORM:
+      return PIPE_FORMAT_L8A8_SRGB;
+   case PIPE_FORMAT_R8G8B8_UNORM:
+      return PIPE_FORMAT_R8G8B8_SRGB;
+   case PIPE_FORMAT_A8B8G8R8_UNORM:
+      return PIPE_FORMAT_A8B8G8R8_SRGB;
+   case PIPE_FORMAT_X8B8G8R8_UNORM:
+      return PIPE_FORMAT_X8B8G8R8_SRGB;
+   case PIPE_FORMAT_B8G8R8A8_UNORM:
+      return PIPE_FORMAT_B8G8R8A8_SRGB;
+   case PIPE_FORMAT_B8G8R8X8_UNORM:
+      return PIPE_FORMAT_B8G8R8X8_SRGB;
+   case PIPE_FORMAT_A8R8G8B8_UNORM:
+      return PIPE_FORMAT_A8R8G8B8_SRGB;
+   case PIPE_FORMAT_X8R8G8B8_UNORM:
+      return PIPE_FORMAT_X8R8G8B8_SRGB;
+   case PIPE_FORMAT_DXT1_RGB:
+      return PIPE_FORMAT_DXT1_SRGB;
+   case PIPE_FORMAT_DXT1_RGBA:
+      return PIPE_FORMAT_DXT1_SRGBA;
+   case PIPE_FORMAT_DXT3_RGBA:
+      return PIPE_FORMAT_DXT3_SRGBA;
+   case PIPE_FORMAT_DXT5_RGBA:
+      return PIPE_FORMAT_DXT5_SRGBA;
+   default:
+      return PIPE_FORMAT_NONE;
+   }
+}
+
+/**
+ * Given an sRGB format, return the corresponding linear colorspace format.
+ * For non sRGB formats, return the format unchanged.
+ */
+static INLINE enum pipe_format
+util_format_linear(enum pipe_format format)
+{
+   switch (format) {
+   case PIPE_FORMAT_L8_SRGB:
+      return PIPE_FORMAT_L8_UNORM;
+   case PIPE_FORMAT_L8A8_SRGB:
+      return PIPE_FORMAT_L8A8_UNORM;
+   case PIPE_FORMAT_R8G8B8_SRGB:
+      return PIPE_FORMAT_R8G8B8_UNORM;
+   case PIPE_FORMAT_A8B8G8R8_SRGB:
+      return PIPE_FORMAT_A8B8G8R8_UNORM;
+   case PIPE_FORMAT_X8B8G8R8_SRGB:
+      return PIPE_FORMAT_X8B8G8R8_UNORM;
+   case PIPE_FORMAT_B8G8R8A8_SRGB:
+      return PIPE_FORMAT_B8G8R8A8_UNORM;
+   case PIPE_FORMAT_B8G8R8X8_SRGB:
+      return PIPE_FORMAT_B8G8R8X8_UNORM;
+   case PIPE_FORMAT_A8R8G8B8_SRGB:
+      return PIPE_FORMAT_A8R8G8B8_UNORM;
+   case PIPE_FORMAT_X8R8G8B8_SRGB:
+      return PIPE_FORMAT_X8R8G8B8_UNORM;
+   case PIPE_FORMAT_DXT1_SRGB:
+      return PIPE_FORMAT_DXT1_RGB;
+   case PIPE_FORMAT_DXT1_SRGBA:
+      return PIPE_FORMAT_DXT1_RGBA;
+   case PIPE_FORMAT_DXT3_SRGBA:
+      return PIPE_FORMAT_DXT3_RGBA;
+   case PIPE_FORMAT_DXT5_SRGBA:
+      return PIPE_FORMAT_DXT5_RGBA;
+   default:
+      return format;
+   }
+}
+
+/**
+ * Return the number of components stored.
+ * Formats with block size != 1x1 will always have 1 component (the block).
+ */
+static INLINE unsigned
+util_format_get_nr_components(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   return desc->nr_channels;
+}
+
+/*
+ * Format access functions.
+ */
+
+void
+util_format_read_4f(enum pipe_format format,
+                    float *dst, unsigned dst_stride, 
+                    const void *src, unsigned src_stride, 
+                    unsigned x, unsigned y, unsigned w, unsigned h);
+
+void
+util_format_write_4f(enum pipe_format format,
+                     const float *src, unsigned src_stride, 
+                     void *dst, unsigned dst_stride, 
+                     unsigned x, unsigned y, unsigned w, unsigned h);
+
+void
+util_format_read_4ub(enum pipe_format format,
+                     uint8_t *dst, unsigned dst_stride, 
+                     const void *src, unsigned src_stride, 
+                     unsigned x, unsigned y, unsigned w, unsigned h);
+
+void
+util_format_write_4ub(enum pipe_format format,
+                      const uint8_t *src, unsigned src_stride, 
+                      void *dst, unsigned dst_stride, 
+                      unsigned x, unsigned y, unsigned w, unsigned h);
+
+/*
+ * Generic format conversion;
+ */
+
+boolean
+util_format_fits_8unorm(const struct util_format_description *format_desc);
+
+void
+util_format_translate(enum pipe_format dst_format,
+                      void *dst, unsigned dst_stride,
+                      unsigned dst_x, unsigned dst_y,
+                      enum pipe_format src_format,
+                      const void *src, unsigned src_stride,
+                      unsigned src_x, unsigned src_y,
+                      unsigned width, unsigned height);
+
+/*
+ * Swizzle operations.
+ */
+
+/* Compose two sets of swizzles.
+ * If V is a 4D vector and the function parameters represent functions that
+ * swizzle vector components, this holds:
+ *     swz2(swz1(V)) = dst(V)
+ */
+void util_format_compose_swizzles(const unsigned char swz1[4],
+                                  const unsigned char swz2[4],
+                                  unsigned char dst[4]);
+
+void util_format_swizzle_4f(float *dst, const float *src,
+                            const unsigned char swz[4]);
+
+void util_format_unswizzle_4f(float *dst, const float *src,
+                              const unsigned char swz[4]);
+
+#ifdef __cplusplus
+} // extern "C" {
+#endif
+
+#endif /* ! U_FORMAT_H */