xserver and mesa git update 28-12-2010

1 files changed, 433 insertions, 433 deletions

diff --git a/mesalib/src/mesa/swrast/s_zoom.c b/mesalib/src/mesa/swrast/s_zoom.c
index f224627d5..3b99bf754 100644
--- a/mesalib/src/mesa/swrast/s_zoom.c
+++ b/mesalib/src/mesa/swrast/s_zoom.c
@@ -1,433 +1,433 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.1
- *
- * Copyright (C) 1999-2008  Brian Paul   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.
- */
-
-#include "main/glheader.h"
-#include "main/macros.h"
-#include "main/imports.h"
-#include "main/colormac.h"
-
-#include "s_context.h"
-#include "s_span.h"
-#include "s_stencil.h"
-#include "s_zoom.h"
-
-
-/**
- * Compute the bounds of the region resulting from zooming a pixel span.
- * The resulting region will be entirely inside the window/scissor bounds
- * so no additional clipping is needed.
- * \param imageX, imageY  position of the mage being drawn (gl WindowPos)
- * \param spanX, spanY  position of span being drawing
- * \param width  number of pixels in span
- * \param x0, x1  returned X bounds of zoomed region [x0, x1)
- * \param y0, y1  returned Y bounds of zoomed region [y0, y1)
- * \return GL_TRUE if any zoomed pixels visible, GL_FALSE if totally clipped
- */
-static GLboolean
-compute_zoomed_bounds(GLcontext *ctx, GLint imageX, GLint imageY,
-                      GLint spanX, GLint spanY, GLint width,
-                      GLint *x0, GLint *x1, GLint *y0, GLint *y1)
-{
-   const struct gl_framebuffer *fb = ctx->DrawBuffer;
-   GLint c0, c1, r0, r1;
-
-   ASSERT(spanX >= imageX);
-   ASSERT(spanY >= imageY);
-
-   /*
-    * Compute destination columns: [c0, c1)
-    */
-   c0 = imageX + (GLint) ((spanX - imageX) * ctx->Pixel.ZoomX);
-   c1 = imageX + (GLint) ((spanX + width - imageX) * ctx->Pixel.ZoomX);
-   if (c1 < c0) {
-      /* swap */
-      GLint tmp = c1;
-      c1 = c0;
-      c0 = tmp;
-   }
-   c0 = CLAMP(c0, fb->_Xmin, fb->_Xmax);
-   c1 = CLAMP(c1, fb->_Xmin, fb->_Xmax);
-   if (c0 == c1) {
-      return GL_FALSE; /* no width */
-   }
-
-   /*
-    * Compute destination rows: [r0, r1)
-    */
-   r0 = imageY + (GLint) ((spanY - imageY) * ctx->Pixel.ZoomY);
-   r1 = imageY + (GLint) ((spanY + 1 - imageY) * ctx->Pixel.ZoomY);
-   if (r1 < r0) {
-      /* swap */
-      GLint tmp = r1;
-      r1 = r0;
-      r0 = tmp;
-   }
-   r0 = CLAMP(r0, fb->_Ymin, fb->_Ymax);
-   r1 = CLAMP(r1, fb->_Ymin, fb->_Ymax);
-   if (r0 == r1) {
-      return GL_FALSE; /* no height */
-   }
-
-   *x0 = c0;
-   *x1 = c1;
-   *y0 = r0;
-   *y1 = r1;
-
-   return GL_TRUE;
-}
-
-
-/**
- * Convert a zoomed x image coordinate back to an unzoomed x coord.
- * 'zx' is screen position of a pixel in the zoomed image, who's left edge
- * is at 'imageX'.
- * return corresponding x coord in the original, unzoomed image.
- * This can use this for unzooming X or Y values.
- */
-static INLINE GLint
-unzoom_x(GLfloat zoomX, GLint imageX, GLint zx)
-{
-   /*
-   zx = imageX + (x - imageX) * zoomX;
-   zx - imageX = (x - imageX) * zoomX;
-   (zx - imageX) / zoomX = x - imageX;
-   */
-   GLint x;
-   if (zoomX < 0.0)
-      zx++;
-   x = imageX + (GLint) ((zx - imageX) / zoomX);
-   return x;
-}
-
-
-
-/**
- * Helper function called from _swrast_write_zoomed_rgba/rgb/
- * index/depth_span().
- */
-static void
-zoom_span( GLcontext *ctx, GLint imgX, GLint imgY, const SWspan *span,
-           const GLvoid *src, GLenum format )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   SWspan zoomed;
-   GLint x0, x1, y0, y1;
-   GLint zoomedWidth;
-
-   if (!compute_zoomed_bounds(ctx, imgX, imgY, span->x, span->y, span->end,
-                              &x0, &x1, &y0, &y1)) {
-      return;  /* totally clipped */
-   }
-
-   if (!swrast->ZoomedArrays) {
-      /* allocate on demand */
-      swrast->ZoomedArrays = (SWspanarrays *) CALLOC(sizeof(SWspanarrays));
-      if (!swrast->ZoomedArrays)
-         return;
-   }
-
-   zoomedWidth = x1 - x0;
-   ASSERT(zoomedWidth > 0);
-   ASSERT(zoomedWidth <= MAX_WIDTH);
-
-   /* no pixel arrays! must be horizontal spans. */
-   ASSERT((span->arrayMask & SPAN_XY) == 0);
-   ASSERT(span->primitive == GL_BITMAP);
-
-   INIT_SPAN(zoomed, GL_BITMAP);
-   zoomed.x = x0;
-   zoomed.end = zoomedWidth;
-   zoomed.array = swrast->ZoomedArrays;
-   zoomed.array->ChanType = span->array->ChanType;
-   if (zoomed.array->ChanType == GL_UNSIGNED_BYTE)
-      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8;
-   else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT)
-      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16;
-   else
-      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[FRAG_ATTRIB_COL0];
-
-   COPY_4V(zoomed.attrStart[FRAG_ATTRIB_WPOS], span->attrStart[FRAG_ATTRIB_WPOS]);
-   COPY_4V(zoomed.attrStepX[FRAG_ATTRIB_WPOS], span->attrStepX[FRAG_ATTRIB_WPOS]);
-   COPY_4V(zoomed.attrStepY[FRAG_ATTRIB_WPOS], span->attrStepY[FRAG_ATTRIB_WPOS]);
-
-   zoomed.attrStart[FRAG_ATTRIB_FOGC][0] = span->attrStart[FRAG_ATTRIB_FOGC][0];
-   zoomed.attrStepX[FRAG_ATTRIB_FOGC][0] = span->attrStepX[FRAG_ATTRIB_FOGC][0];
-   zoomed.attrStepY[FRAG_ATTRIB_FOGC][0] = span->attrStepY[FRAG_ATTRIB_FOGC][0];
-
-   if (format == GL_RGBA || format == GL_RGB) {
-      /* copy Z info */
-      zoomed.z = span->z;
-      zoomed.zStep = span->zStep;
-      /* we'll generate an array of colorss */
-      zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
-      zoomed.arrayMask |= SPAN_RGBA;
-      zoomed.arrayAttribs |= FRAG_BIT_COL0;  /* we'll produce these values */
-      ASSERT(span->arrayMask & SPAN_RGBA);
-   }
-   else if (format == GL_DEPTH_COMPONENT) {
-      /* Copy color info */
-      zoomed.red = span->red;
-      zoomed.green = span->green;
-      zoomed.blue = span->blue;
-      zoomed.alpha = span->alpha;
-      zoomed.redStep = span->redStep;
-      zoomed.greenStep = span->greenStep;
-      zoomed.blueStep = span->blueStep;
-      zoomed.alphaStep = span->alphaStep;
-      /* we'll generate an array of depth values */
-      zoomed.interpMask = span->interpMask & ~SPAN_Z;
-      zoomed.arrayMask |= SPAN_Z;
-      ASSERT(span->arrayMask & SPAN_Z);
-   }
-   else {
-      _mesa_problem(ctx, "Bad format in zoom_span");
-      return;
-   }
-
-   /* zoom the span horizontally */
-   if (format == GL_RGBA) {
-      if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
-         const GLubyte (*rgba)[4] = (const GLubyte (*)[4]) src;
-         GLint i;
-         for (i = 0; i < zoomedWidth; i++) {
-            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-            ASSERT(j >= 0);
-            ASSERT(j < (GLint) span->end);
-            COPY_4UBV(zoomed.array->rgba8[i], rgba[j]);
-         }
-      }
-      else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
-         const GLushort (*rgba)[4] = (const GLushort (*)[4]) src;
-         GLint i;
-         for (i = 0; i < zoomedWidth; i++) {
-            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-            ASSERT(j >= 0);
-            ASSERT(j < (GLint) span->end);
-            COPY_4V(zoomed.array->rgba16[i], rgba[j]);
-         }
-      }
-      else {
-         const GLfloat (*rgba)[4] = (const GLfloat (*)[4]) src;
-         GLint i;
-         for (i = 0; i < zoomedWidth; i++) {
-            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-            ASSERT(j >= 0);
-            ASSERT(j < span->end);
-            COPY_4V(zoomed.array->attribs[FRAG_ATTRIB_COL0][i], rgba[j]);
-         }
-      }
-   }
-   else if (format == GL_RGB) {
-      if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
-         const GLubyte (*rgb)[3] = (const GLubyte (*)[3]) src;
-         GLint i;
-         for (i = 0; i < zoomedWidth; i++) {
-            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-            ASSERT(j >= 0);
-            ASSERT(j < (GLint) span->end);
-            zoomed.array->rgba8[i][0] = rgb[j][0];
-            zoomed.array->rgba8[i][1] = rgb[j][1];
-            zoomed.array->rgba8[i][2] = rgb[j][2];
-            zoomed.array->rgba8[i][3] = 0xff;
-         }
-      }
-      else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
-         const GLushort (*rgb)[3] = (const GLushort (*)[3]) src;
-         GLint i;
-         for (i = 0; i < zoomedWidth; i++) {
-            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-            ASSERT(j >= 0);
-            ASSERT(j < (GLint) span->end);
-            zoomed.array->rgba16[i][0] = rgb[j][0];
-            zoomed.array->rgba16[i][1] = rgb[j][1];
-            zoomed.array->rgba16[i][2] = rgb[j][2];
-            zoomed.array->rgba16[i][3] = 0xffff;
-         }
-      }
-      else {
-         const GLfloat (*rgb)[3] = (const GLfloat (*)[3]) src;
-         GLint i;
-         for (i = 0; i < zoomedWidth; i++) {
-            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-            ASSERT(j >= 0);
-            ASSERT(j < span->end);
-            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][0] = rgb[j][0];
-            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][1] = rgb[j][1];
-            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][2] = rgb[j][2];
-            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][3] = 1.0F;
-         }
-      }
-   }
-   else if (format == GL_DEPTH_COMPONENT) {
-      const GLuint *zValues = (const GLuint *) src;
-      GLint i;
-      for (i = 0; i < zoomedWidth; i++) {
-         GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
-         ASSERT(j >= 0);
-         ASSERT(j < (GLint) span->end);
-         zoomed.array->z[i] = zValues[j];
-      }
-      /* Now, fall into the RGB path below */
-      format = GL_RGBA;
-   }
-
-   /* write the span in rows [r0, r1) */
-   if (format == GL_RGBA || format == GL_RGB) {
-      /* Writing the span may modify the colors, so make a backup now if we're
-       * going to call _swrast_write_zoomed_span() more than once.
-       * Also, clipping may change the span end value, so store it as well.
-       */
-      const GLint end = zoomed.end; /* save */
-      GLuint rgbaSave[MAX_WIDTH][4];
-      const GLint pixelSize =
-         (zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :
-         ((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)
-          : 4 * sizeof(GLfloat));
-      if (y1 - y0 > 1) {
-         memcpy(rgbaSave, zoomed.array->rgba, zoomed.end * pixelSize);
-      }
-      for (zoomed.y = y0; zoomed.y < y1; zoomed.y++) {
-         _swrast_write_rgba_span(ctx, &zoomed);
-         zoomed.end = end;  /* restore */
-         if (y1 - y0 > 1) {
-            /* restore the colors */
-            memcpy(zoomed.array->rgba, rgbaSave, zoomed.end * pixelSize);
-         }
-      }
-   }
-}
-
-
-void
-_swrast_write_zoomed_rgba_span(GLcontext *ctx, GLint imgX, GLint imgY,
-                               const SWspan *span, const GLvoid *rgba)
-{
-   zoom_span(ctx, imgX, imgY, span, rgba, GL_RGBA);
-}
-
-
-void
-_swrast_write_zoomed_rgb_span(GLcontext *ctx, GLint imgX, GLint imgY,
-                              const SWspan *span, const GLvoid *rgb)
-{
-   zoom_span(ctx, imgX, imgY, span, rgb, GL_RGB);
-}
-
-
-void
-_swrast_write_zoomed_depth_span(GLcontext *ctx, GLint imgX, GLint imgY,
-                                const SWspan *span)
-{
-   zoom_span(ctx, imgX, imgY, span,
-             (const GLvoid *) span->array->z, GL_DEPTH_COMPONENT);
-}
-
-
-/**
- * Zoom/write stencil values.
- * No per-fragment operations are applied.
- */
-void
-_swrast_write_zoomed_stencil_span(GLcontext *ctx, GLint imgX, GLint imgY,
-                                  GLint width, GLint spanX, GLint spanY,
-                                  const GLstencil stencil[])
-{
-   GLstencil zoomedVals[MAX_WIDTH];
-   GLint x0, x1, y0, y1, y;
-   GLint i, zoomedWidth;
-
-   if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
-                              &x0, &x1, &y0, &y1)) {
-      return;  /* totally clipped */
-   }
-
-   zoomedWidth = x1 - x0;
-   ASSERT(zoomedWidth > 0);
-   ASSERT(zoomedWidth <= MAX_WIDTH);
-
-   /* zoom the span horizontally */
-   for (i = 0; i < zoomedWidth; i++) {
-      GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
-      ASSERT(j >= 0);
-      ASSERT(j < width);
-      zoomedVals[i] = stencil[j];
-   }
-
-   /* write the zoomed spans */
-   for (y = y0; y < y1; y++) {
-      _swrast_write_stencil_span(ctx, zoomedWidth, x0, y, zoomedVals);
-   }
-}
-
-
-/**
- * Zoom/write z values (16 or 32-bit).
- * No per-fragment operations are applied.
- */
-void
-_swrast_write_zoomed_z_span(GLcontext *ctx, GLint imgX, GLint imgY,
-                            GLint width, GLint spanX, GLint spanY,
-                            const GLvoid *z)
-{
-   struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer;
-   GLushort zoomedVals16[MAX_WIDTH];
-   GLuint zoomedVals32[MAX_WIDTH];
-   GLint x0, x1, y0, y1, y;
-   GLint i, zoomedWidth;
-
-   if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
-                              &x0, &x1, &y0, &y1)) {
-      return;  /* totally clipped */
-   }
-
-   zoomedWidth = x1 - x0;
-   ASSERT(zoomedWidth > 0);
-   ASSERT(zoomedWidth <= MAX_WIDTH);
-
-   /* zoom the span horizontally */
-   if (rb->DataType == GL_UNSIGNED_SHORT) {
-      for (i = 0; i < zoomedWidth; i++) {
-         GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
-         ASSERT(j >= 0);
-         ASSERT(j < width);
-         zoomedVals16[i] = ((GLushort *) z)[j];
-      }
-      z = zoomedVals16;
-   }
-   else {
-      ASSERT(rb->DataType == GL_UNSIGNED_INT);
-      for (i = 0; i < zoomedWidth; i++) {
-         GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
-         ASSERT(j >= 0);
-         ASSERT(j < width);
-         zoomedVals32[i] = ((GLuint *) z)[j];
-      }
-      z = zoomedVals32;
-   }
-
-   /* write the zoomed spans */
-   for (y = y0; y < y1; y++) {
-      rb->PutRow(ctx, rb, zoomedWidth, x0, y, z, NULL);
-   }
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.1

+ *

+ * Copyright (C) 1999-2008  Brian Paul   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.

+ */

+

+#include "main/glheader.h"

+#include "main/macros.h"

+#include "main/imports.h"

+#include "main/colormac.h"

+

+#include "s_context.h"

+#include "s_span.h"

+#include "s_stencil.h"

+#include "s_zoom.h"

+

+

+/**

+ * Compute the bounds of the region resulting from zooming a pixel span.

+ * The resulting region will be entirely inside the window/scissor bounds

+ * so no additional clipping is needed.

+ * \param imageX, imageY  position of the mage being drawn (gl WindowPos)

+ * \param spanX, spanY  position of span being drawing

+ * \param width  number of pixels in span

+ * \param x0, x1  returned X bounds of zoomed region [x0, x1)

+ * \param y0, y1  returned Y bounds of zoomed region [y0, y1)

+ * \return GL_TRUE if any zoomed pixels visible, GL_FALSE if totally clipped

+ */

+static GLboolean

+compute_zoomed_bounds(struct gl_context *ctx, GLint imageX, GLint imageY,

+                      GLint spanX, GLint spanY, GLint width,

+                      GLint *x0, GLint *x1, GLint *y0, GLint *y1)

+{

+   const struct gl_framebuffer *fb = ctx->DrawBuffer;

+   GLint c0, c1, r0, r1;

+

+   ASSERT(spanX >= imageX);

+   ASSERT(spanY >= imageY);

+

+   /*

+    * Compute destination columns: [c0, c1)

+    */

+   c0 = imageX + (GLint) ((spanX - imageX) * ctx->Pixel.ZoomX);

+   c1 = imageX + (GLint) ((spanX + width - imageX) * ctx->Pixel.ZoomX);

+   if (c1 < c0) {

+      /* swap */

+      GLint tmp = c1;

+      c1 = c0;

+      c0 = tmp;

+   }

+   c0 = CLAMP(c0, fb->_Xmin, fb->_Xmax);

+   c1 = CLAMP(c1, fb->_Xmin, fb->_Xmax);

+   if (c0 == c1) {

+      return GL_FALSE; /* no width */

+   }

+

+   /*

+    * Compute destination rows: [r0, r1)

+    */

+   r0 = imageY + (GLint) ((spanY - imageY) * ctx->Pixel.ZoomY);

+   r1 = imageY + (GLint) ((spanY + 1 - imageY) * ctx->Pixel.ZoomY);

+   if (r1 < r0) {

+      /* swap */

+      GLint tmp = r1;

+      r1 = r0;

+      r0 = tmp;

+   }

+   r0 = CLAMP(r0, fb->_Ymin, fb->_Ymax);

+   r1 = CLAMP(r1, fb->_Ymin, fb->_Ymax);

+   if (r0 == r1) {

+      return GL_FALSE; /* no height */

+   }

+

+   *x0 = c0;

+   *x1 = c1;

+   *y0 = r0;

+   *y1 = r1;

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Convert a zoomed x image coordinate back to an unzoomed x coord.

+ * 'zx' is screen position of a pixel in the zoomed image, who's left edge

+ * is at 'imageX'.

+ * return corresponding x coord in the original, unzoomed image.

+ * This can use this for unzooming X or Y values.

+ */

+static INLINE GLint

+unzoom_x(GLfloat zoomX, GLint imageX, GLint zx)

+{

+   /*

+   zx = imageX + (x - imageX) * zoomX;

+   zx - imageX = (x - imageX) * zoomX;

+   (zx - imageX) / zoomX = x - imageX;

+   */

+   GLint x;

+   if (zoomX < 0.0)

+      zx++;

+   x = imageX + (GLint) ((zx - imageX) / zoomX);

+   return x;

+}

+

+

+

+/**

+ * Helper function called from _swrast_write_zoomed_rgba/rgb/

+ * index/depth_span().

+ */

+static void

+zoom_span( struct gl_context *ctx, GLint imgX, GLint imgY, const SWspan *span,

+           const GLvoid *src, GLenum format )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   SWspan zoomed;

+   GLint x0, x1, y0, y1;

+   GLint zoomedWidth;

+

+   if (!compute_zoomed_bounds(ctx, imgX, imgY, span->x, span->y, span->end,

+                              &x0, &x1, &y0, &y1)) {

+      return;  /* totally clipped */

+   }

+

+   if (!swrast->ZoomedArrays) {

+      /* allocate on demand */

+      swrast->ZoomedArrays = (SWspanarrays *) CALLOC(sizeof(SWspanarrays));

+      if (!swrast->ZoomedArrays)

+         return;

+   }

+

+   zoomedWidth = x1 - x0;

+   ASSERT(zoomedWidth > 0);

+   ASSERT(zoomedWidth <= MAX_WIDTH);

+

+   /* no pixel arrays! must be horizontal spans. */

+   ASSERT((span->arrayMask & SPAN_XY) == 0);

+   ASSERT(span->primitive == GL_BITMAP);

+

+   INIT_SPAN(zoomed, GL_BITMAP);

+   zoomed.x = x0;

+   zoomed.end = zoomedWidth;

+   zoomed.array = swrast->ZoomedArrays;

+   zoomed.array->ChanType = span->array->ChanType;

+   if (zoomed.array->ChanType == GL_UNSIGNED_BYTE)

+      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8;

+   else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT)

+      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16;

+   else

+      zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[FRAG_ATTRIB_COL0];

+

+   COPY_4V(zoomed.attrStart[FRAG_ATTRIB_WPOS], span->attrStart[FRAG_ATTRIB_WPOS]);

+   COPY_4V(zoomed.attrStepX[FRAG_ATTRIB_WPOS], span->attrStepX[FRAG_ATTRIB_WPOS]);

+   COPY_4V(zoomed.attrStepY[FRAG_ATTRIB_WPOS], span->attrStepY[FRAG_ATTRIB_WPOS]);

+

+   zoomed.attrStart[FRAG_ATTRIB_FOGC][0] = span->attrStart[FRAG_ATTRIB_FOGC][0];

+   zoomed.attrStepX[FRAG_ATTRIB_FOGC][0] = span->attrStepX[FRAG_ATTRIB_FOGC][0];

+   zoomed.attrStepY[FRAG_ATTRIB_FOGC][0] = span->attrStepY[FRAG_ATTRIB_FOGC][0];

+

+   if (format == GL_RGBA || format == GL_RGB) {

+      /* copy Z info */

+      zoomed.z = span->z;

+      zoomed.zStep = span->zStep;

+      /* we'll generate an array of colorss */

+      zoomed.interpMask = span->interpMask & ~SPAN_RGBA;

+      zoomed.arrayMask |= SPAN_RGBA;

+      zoomed.arrayAttribs |= FRAG_BIT_COL0;  /* we'll produce these values */

+      ASSERT(span->arrayMask & SPAN_RGBA);

+   }

+   else if (format == GL_DEPTH_COMPONENT) {

+      /* Copy color info */

+      zoomed.red = span->red;

+      zoomed.green = span->green;

+      zoomed.blue = span->blue;

+      zoomed.alpha = span->alpha;

+      zoomed.redStep = span->redStep;

+      zoomed.greenStep = span->greenStep;

+      zoomed.blueStep = span->blueStep;

+      zoomed.alphaStep = span->alphaStep;

+      /* we'll generate an array of depth values */

+      zoomed.interpMask = span->interpMask & ~SPAN_Z;

+      zoomed.arrayMask |= SPAN_Z;

+      ASSERT(span->arrayMask & SPAN_Z);

+   }

+   else {

+      _mesa_problem(ctx, "Bad format in zoom_span");

+      return;

+   }

+

+   /* zoom the span horizontally */

+   if (format == GL_RGBA) {

+      if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {

+         const GLubyte (*rgba)[4] = (const GLubyte (*)[4]) src;

+         GLint i;

+         for (i = 0; i < zoomedWidth; i++) {

+            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+            ASSERT(j >= 0);

+            ASSERT(j < (GLint) span->end);

+            COPY_4UBV(zoomed.array->rgba8[i], rgba[j]);

+         }

+      }

+      else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {

+         const GLushort (*rgba)[4] = (const GLushort (*)[4]) src;

+         GLint i;

+         for (i = 0; i < zoomedWidth; i++) {

+            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+            ASSERT(j >= 0);

+            ASSERT(j < (GLint) span->end);

+            COPY_4V(zoomed.array->rgba16[i], rgba[j]);

+         }

+      }

+      else {

+         const GLfloat (*rgba)[4] = (const GLfloat (*)[4]) src;

+         GLint i;

+         for (i = 0; i < zoomedWidth; i++) {

+            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+            ASSERT(j >= 0);

+            ASSERT(j < span->end);

+            COPY_4V(zoomed.array->attribs[FRAG_ATTRIB_COL0][i], rgba[j]);

+         }

+      }

+   }

+   else if (format == GL_RGB) {

+      if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {

+         const GLubyte (*rgb)[3] = (const GLubyte (*)[3]) src;

+         GLint i;

+         for (i = 0; i < zoomedWidth; i++) {

+            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+            ASSERT(j >= 0);

+            ASSERT(j < (GLint) span->end);

+            zoomed.array->rgba8[i][0] = rgb[j][0];

+            zoomed.array->rgba8[i][1] = rgb[j][1];

+            zoomed.array->rgba8[i][2] = rgb[j][2];

+            zoomed.array->rgba8[i][3] = 0xff;

+         }

+      }

+      else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {

+         const GLushort (*rgb)[3] = (const GLushort (*)[3]) src;

+         GLint i;

+         for (i = 0; i < zoomedWidth; i++) {

+            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+            ASSERT(j >= 0);

+            ASSERT(j < (GLint) span->end);

+            zoomed.array->rgba16[i][0] = rgb[j][0];

+            zoomed.array->rgba16[i][1] = rgb[j][1];

+            zoomed.array->rgba16[i][2] = rgb[j][2];

+            zoomed.array->rgba16[i][3] = 0xffff;

+         }

+      }

+      else {

+         const GLfloat (*rgb)[3] = (const GLfloat (*)[3]) src;

+         GLint i;

+         for (i = 0; i < zoomedWidth; i++) {

+            GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+            ASSERT(j >= 0);

+            ASSERT(j < span->end);

+            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][0] = rgb[j][0];

+            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][1] = rgb[j][1];

+            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][2] = rgb[j][2];

+            zoomed.array->attribs[FRAG_ATTRIB_COL0][i][3] = 1.0F;

+         }

+      }

+   }

+   else if (format == GL_DEPTH_COMPONENT) {

+      const GLuint *zValues = (const GLuint *) src;

+      GLint i;

+      for (i = 0; i < zoomedWidth; i++) {

+         GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;

+         ASSERT(j >= 0);

+         ASSERT(j < (GLint) span->end);

+         zoomed.array->z[i] = zValues[j];

+      }

+      /* Now, fall into the RGB path below */

+      format = GL_RGBA;

+   }

+

+   /* write the span in rows [r0, r1) */

+   if (format == GL_RGBA || format == GL_RGB) {

+      /* Writing the span may modify the colors, so make a backup now if we're

+       * going to call _swrast_write_zoomed_span() more than once.

+       * Also, clipping may change the span end value, so store it as well.

+       */

+      const GLint end = zoomed.end; /* save */

+      GLuint rgbaSave[MAX_WIDTH][4];

+      const GLint pixelSize =

+         (zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :

+         ((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)

+          : 4 * sizeof(GLfloat));

+      if (y1 - y0 > 1) {

+         memcpy(rgbaSave, zoomed.array->rgba, zoomed.end * pixelSize);

+      }

+      for (zoomed.y = y0; zoomed.y < y1; zoomed.y++) {

+         _swrast_write_rgba_span(ctx, &zoomed);

+         zoomed.end = end;  /* restore */

+         if (y1 - y0 > 1) {

+            /* restore the colors */

+            memcpy(zoomed.array->rgba, rgbaSave, zoomed.end * pixelSize);

+         }

+      }

+   }

+}

+

+

+void

+_swrast_write_zoomed_rgba_span(struct gl_context *ctx, GLint imgX, GLint imgY,

+                               const SWspan *span, const GLvoid *rgba)

+{

+   zoom_span(ctx, imgX, imgY, span, rgba, GL_RGBA);

+}

+

+

+void

+_swrast_write_zoomed_rgb_span(struct gl_context *ctx, GLint imgX, GLint imgY,

+                              const SWspan *span, const GLvoid *rgb)

+{

+   zoom_span(ctx, imgX, imgY, span, rgb, GL_RGB);

+}

+

+

+void

+_swrast_write_zoomed_depth_span(struct gl_context *ctx, GLint imgX, GLint imgY,

+                                const SWspan *span)

+{

+   zoom_span(ctx, imgX, imgY, span,

+             (const GLvoid *) span->array->z, GL_DEPTH_COMPONENT);

+}

+

+

+/**

+ * Zoom/write stencil values.

+ * No per-fragment operations are applied.

+ */

+void

+_swrast_write_zoomed_stencil_span(struct gl_context *ctx, GLint imgX, GLint imgY,

+                                  GLint width, GLint spanX, GLint spanY,

+                                  const GLstencil stencil[])

+{

+   GLstencil zoomedVals[MAX_WIDTH];

+   GLint x0, x1, y0, y1, y;

+   GLint i, zoomedWidth;

+

+   if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,

+                              &x0, &x1, &y0, &y1)) {

+      return;  /* totally clipped */

+   }

+

+   zoomedWidth = x1 - x0;

+   ASSERT(zoomedWidth > 0);

+   ASSERT(zoomedWidth <= MAX_WIDTH);

+

+   /* zoom the span horizontally */

+   for (i = 0; i < zoomedWidth; i++) {

+      GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;

+      ASSERT(j >= 0);

+      ASSERT(j < width);

+      zoomedVals[i] = stencil[j];

+   }

+

+   /* write the zoomed spans */

+   for (y = y0; y < y1; y++) {

+      _swrast_write_stencil_span(ctx, zoomedWidth, x0, y, zoomedVals);

+   }

+}

+

+

+/**

+ * Zoom/write z values (16 or 32-bit).

+ * No per-fragment operations are applied.

+ */

+void

+_swrast_write_zoomed_z_span(struct gl_context *ctx, GLint imgX, GLint imgY,

+                            GLint width, GLint spanX, GLint spanY,

+                            const GLvoid *z)

+{

+   struct gl_renderbuffer *rb = ctx->DrawBuffer->_DepthBuffer;

+   GLushort zoomedVals16[MAX_WIDTH];

+   GLuint zoomedVals32[MAX_WIDTH];

+   GLint x0, x1, y0, y1, y;

+   GLint i, zoomedWidth;

+

+   if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,

+                              &x0, &x1, &y0, &y1)) {

+      return;  /* totally clipped */

+   }

+

+   zoomedWidth = x1 - x0;

+   ASSERT(zoomedWidth > 0);

+   ASSERT(zoomedWidth <= MAX_WIDTH);

+

+   /* zoom the span horizontally */

+   if (rb->DataType == GL_UNSIGNED_SHORT) {

+      for (i = 0; i < zoomedWidth; i++) {

+         GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;

+         ASSERT(j >= 0);

+         ASSERT(j < width);

+         zoomedVals16[i] = ((GLushort *) z)[j];

+      }

+      z = zoomedVals16;

+   }

+   else {

+      ASSERT(rb->DataType == GL_UNSIGNED_INT);

+      for (i = 0; i < zoomedWidth; i++) {

+         GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;

+         ASSERT(j >= 0);

+         ASSERT(j < width);

+         zoomedVals32[i] = ((GLuint *) z)[j];

+      }

+      z = zoomedVals32;

+   }

+

+   /* write the zoomed spans */

+   for (y = y0; y < y1; y++) {

+      rb->PutRow(ctx, rb, zoomedWidth, x0, y, z, NULL);

+   }

+}