randrproto mesa xserver git update 4 aug 2011

1 files changed, 442 insertions, 392 deletions

diff --git a/mesalib/src/gallium/auxiliary/util/u_format.c b/mesalib/src/gallium/auxiliary/util/u_format.c
index 91485b05c..34922ab18 100644
--- a/mesalib/src/gallium/auxiliary/util/u_format.c
+++ b/mesalib/src/gallium/auxiliary/util/u_format.c
@@ -1,392 +1,442 @@
-/**************************************************************************

- *

- * Copyright 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.

- *

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

-

-/**

- * @file

- * Pixel format accessor functions.

- *

- * @author Jose Fonseca <jfonseca@vmware.com>

- */

-

-#include "u_math.h"

-#include "u_memory.h"

-#include "u_rect.h"

-#include "u_format.h"

-#include "u_format_s3tc.h"

-

-#include "pipe/p_defines.h"

-

-

-boolean

-util_format_is_float(enum pipe_format format)

-{

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

-   unsigned i;

-

-   assert(desc);

-   if (!desc) {

-      return FALSE;

-   }

-

-   /* Find the first non-void channel. */

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

-      if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {

-         break;

-      }

-   }

-

-   if (i == 4) {

-      return FALSE;

-   }

-

-   return desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT ? TRUE : FALSE;

-}

-

-

-boolean

-util_format_is_supported(enum pipe_format format, unsigned bind)

-{

-   if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {

-      return FALSE;

-   }

-

-#ifndef TEXTURE_FLOAT_ENABLED

-   if ((bind & PIPE_BIND_RENDER_TARGET) &&

-       format != PIPE_FORMAT_R9G9B9E5_FLOAT &&

-       format != PIPE_FORMAT_R11G11B10_FLOAT &&

-       util_format_is_float(format)) {

-      return FALSE;

-   }

-#endif

-

-   return TRUE;

-}

-

-

-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)

-{

-   const struct util_format_description *format_desc;

-   const uint8_t *src_row;

-   float *dst_row;

-

-   format_desc = util_format_description(format);

-

-   assert(x % format_desc->block.width == 0);

-   assert(y % format_desc->block.height == 0);

-

-   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);

-   dst_row = dst;

-

-   format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, 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)

-{

-   const struct util_format_description *format_desc;

-   uint8_t *dst_row;

-   const float *src_row;

-

-   format_desc = util_format_description(format);

-

-   assert(x % format_desc->block.width == 0);

-   assert(y % format_desc->block.height == 0);

-

-   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);

-   src_row = src;

-

-   format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, 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)

-{

-   const struct util_format_description *format_desc;

-   const uint8_t *src_row;

-   uint8_t *dst_row;

-

-   format_desc = util_format_description(format);

-

-   assert(x % format_desc->block.width == 0);

-   assert(y % format_desc->block.height == 0);

-

-   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);

-   dst_row = dst;

-

-   format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, 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)

-{

-   const struct util_format_description *format_desc;

-   uint8_t *dst_row;

-   const uint8_t *src_row;

-

-   format_desc = util_format_description(format);

-

-   assert(x % format_desc->block.width == 0);

-   assert(y % format_desc->block.height == 0);

-

-   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);

-   src_row = src;

-

-   format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);

-}

-

-

-boolean

-util_is_format_compatible(const struct util_format_description *src_desc,

-                          const struct util_format_description *dst_desc)

-{

-   unsigned chan;

-

-   if (src_desc->format == dst_desc->format) {

-      return TRUE;

-   }

-

-   if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||

-       dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {

-      return FALSE;

-   }

-

-   if (src_desc->block.bits != dst_desc->block.bits ||

-       src_desc->nr_channels != dst_desc->nr_channels ||

-       src_desc->colorspace != dst_desc->colorspace) {

-      return FALSE;

-   }

-

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

-      if (src_desc->channel[chan].size !=

-          dst_desc->channel[chan].size) {

-         return FALSE;

-      }

-   }

-

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

-      enum util_format_swizzle swizzle = dst_desc->swizzle[chan];

-

-      if (swizzle < 4) {

-         if (src_desc->swizzle[chan] != swizzle) {

-            return FALSE;

-         }

-         if ((src_desc->channel[swizzle].type !=

-              dst_desc->channel[swizzle].type) ||

-             (src_desc->channel[swizzle].normalized !=

-              dst_desc->channel[swizzle].normalized)) {

-            return FALSE;

-         }

-      }

-   }

-

-   return TRUE;

-}

-

-

-boolean

-util_format_fits_8unorm(const struct util_format_description *format_desc)

-{

-   unsigned chan;

-

-   /*

-    * After linearized sRGB values require more than 8bits.

-    */

-

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

-      return FALSE;

-   }

-

-   switch (format_desc->layout) {

-

-   case UTIL_FORMAT_LAYOUT_S3TC:

-   case UTIL_FORMAT_LAYOUT_RGTC:

-      /*

-       * These are straight forward.

-       */

-

-      return TRUE;

-

-   case UTIL_FORMAT_LAYOUT_PLAIN:

-      /*

-       * For these we can find a generic rule.

-       */

-

-      for (chan = 0; chan < format_desc->nr_channels; ++chan) {

-         switch (format_desc->channel[chan].type) {

-         case UTIL_FORMAT_TYPE_VOID:

-            break;

-         case UTIL_FORMAT_TYPE_UNSIGNED:

-            if (!format_desc->channel[chan].normalized ||

-                format_desc->channel[chan].size > 8) {

-               return FALSE;

-            }

-            break;

-         default:

-            return FALSE;

-         }

-      }

-      return TRUE;

-

-   default:

-      /*

-       * Handle all others on a case by case basis.

-       */

-

-      switch (format_desc->format) {

-      case PIPE_FORMAT_R1_UNORM:

-      case PIPE_FORMAT_UYVY:

-      case PIPE_FORMAT_YUYV:

-      case PIPE_FORMAT_R8G8_B8G8_UNORM:

-      case PIPE_FORMAT_G8R8_G8B8_UNORM:

-         return TRUE;

-

-      default:

-         return FALSE;

-      }

-   }

-}

-

-

-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)

-{

-   const struct util_format_description *dst_format_desc;

-   const struct util_format_description *src_format_desc;

-   uint8_t *dst_row;

-   const uint8_t *src_row;

-   unsigned x_step, y_step;

-   unsigned dst_step;

-   unsigned src_step;

-

-   dst_format_desc = util_format_description(dst_format);

-   src_format_desc = util_format_description(src_format);

-

-   if (util_is_format_compatible(src_format_desc, dst_format_desc)) {

-      /*

-       * Trivial case.

-       */

-

-      util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,

-                     width, height, src, (int)src_stride,

-                     src_x, src_y);

-      return;

-   }

-

-   assert(dst_x % dst_format_desc->block.width == 0);

-   assert(dst_y % dst_format_desc->block.height == 0);

-   assert(src_x % src_format_desc->block.width == 0);

-   assert(src_y % src_format_desc->block.height == 0);

-

-   dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);

-   src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);

-

-   /*

-    * This works because all pixel formats have pixel blocks with power of two

-    * sizes.

-    */

-

-   y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);

-   x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);

-   assert(y_step % dst_format_desc->block.height == 0);

-   assert(y_step % src_format_desc->block.height == 0);

-

-   dst_step = y_step / dst_format_desc->block.height * dst_stride;

-   src_step = y_step / src_format_desc->block.height * src_stride;

-

-   /*

-    * TODO: double formats will loose precision

-    * TODO: Add a special case for formats that are mere swizzles of each other

-    */

-

-   if (util_format_fits_8unorm(src_format_desc) ||

-       util_format_fits_8unorm(dst_format_desc)) {

-      unsigned tmp_stride;

-      uint8_t *tmp_row;

-

-      tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;

-      tmp_row = MALLOC(y_step * tmp_stride);

-      if (!tmp_row)

-         return;

-

-      while (height >= y_step) {

-         src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);

-         dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);

-

-         dst_row += dst_step;

-         src_row += src_step;

-         height -= y_step;

-      }

-

-      if (height) {

-         src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);

-         dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);

-      }

-

-      FREE(tmp_row);

-   }

-   else {

-      unsigned tmp_stride;

-      float *tmp_row;

-

-      tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;

-      tmp_row = MALLOC(y_step * tmp_stride);

-      if (!tmp_row)

-         return;

-

-      while (height >= y_step) {

-         src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);

-         dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);

-

-         dst_row += dst_step;

-         src_row += src_step;

-         height -= y_step;

-      }

-

-      if (height) {

-         src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);

-         dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);

-      }

-

-      FREE(tmp_row);

-   }

-}

+/**************************************************************************
+ *
+ * Copyright 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Pixel format accessor functions.
+ *
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+#include "u_math.h"
+#include "u_memory.h"
+#include "u_rect.h"
+#include "u_format.h"
+#include "u_format_s3tc.h"
+
+#include "pipe/p_defines.h"
+
+
+boolean
+util_format_is_float(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   unsigned i;
+
+   assert(desc);
+   if (!desc) {
+      return FALSE;
+   }
+
+   /* Find the first non-void channel. */
+   for (i = 0; i < 4; i++) {
+      if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
+         break;
+      }
+   }
+
+   if (i == 4) {
+      return FALSE;
+   }
+
+   return desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT ? TRUE : FALSE;
+}
+
+
+boolean
+util_format_is_supported(enum pipe_format format, unsigned bind)
+{
+   if (util_format_is_s3tc(format) && !util_format_s3tc_enabled) {
+      return FALSE;
+   }
+
+#ifndef TEXTURE_FLOAT_ENABLED
+   if ((bind & PIPE_BIND_RENDER_TARGET) &&
+       format != PIPE_FORMAT_R9G9B9E5_FLOAT &&
+       format != PIPE_FORMAT_R11G11B10_FLOAT &&
+       util_format_is_float(format)) {
+      return FALSE;
+   }
+#endif
+
+   return TRUE;
+}
+
+
+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)
+{
+   const struct util_format_description *format_desc;
+   const uint8_t *src_row;
+   float *dst_row;
+
+   format_desc = util_format_description(format);
+
+   assert(x % format_desc->block.width == 0);
+   assert(y % format_desc->block.height == 0);
+
+   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
+   dst_row = dst;
+
+   format_desc->unpack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, 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)
+{
+   const struct util_format_description *format_desc;
+   uint8_t *dst_row;
+   const float *src_row;
+
+   format_desc = util_format_description(format);
+
+   assert(x % format_desc->block.width == 0);
+   assert(y % format_desc->block.height == 0);
+
+   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
+   src_row = src;
+
+   format_desc->pack_rgba_float(dst_row, dst_stride, src_row, src_stride, w, 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)
+{
+   const struct util_format_description *format_desc;
+   const uint8_t *src_row;
+   uint8_t *dst_row;
+
+   format_desc = util_format_description(format);
+
+   assert(x % format_desc->block.width == 0);
+   assert(y % format_desc->block.height == 0);
+
+   src_row = (const uint8_t *)src + y*src_stride + x*(format_desc->block.bits/8);
+   dst_row = dst;
+
+   format_desc->unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, 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)
+{
+   const struct util_format_description *format_desc;
+   uint8_t *dst_row;
+   const uint8_t *src_row;
+
+   format_desc = util_format_description(format);
+
+   assert(x % format_desc->block.width == 0);
+   assert(y % format_desc->block.height == 0);
+
+   dst_row = (uint8_t *)dst + y*dst_stride + x*(format_desc->block.bits/8);
+   src_row = src;
+
+   format_desc->pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, w, h);
+}
+
+
+boolean
+util_is_format_compatible(const struct util_format_description *src_desc,
+                          const struct util_format_description *dst_desc)
+{
+   unsigned chan;
+
+   if (src_desc->format == dst_desc->format) {
+      return TRUE;
+   }
+
+   if (src_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN ||
+       dst_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN) {
+      return FALSE;
+   }
+
+   if (src_desc->block.bits != dst_desc->block.bits ||
+       src_desc->nr_channels != dst_desc->nr_channels ||
+       src_desc->colorspace != dst_desc->colorspace) {
+      return FALSE;
+   }
+
+   for (chan = 0; chan < 4; ++chan) {
+      if (src_desc->channel[chan].size !=
+          dst_desc->channel[chan].size) {
+         return FALSE;
+      }
+   }
+
+   for (chan = 0; chan < 4; ++chan) {
+      enum util_format_swizzle swizzle = dst_desc->swizzle[chan];
+
+      if (swizzle < 4) {
+         if (src_desc->swizzle[chan] != swizzle) {
+            return FALSE;
+         }
+         if ((src_desc->channel[swizzle].type !=
+              dst_desc->channel[swizzle].type) ||
+             (src_desc->channel[swizzle].normalized !=
+              dst_desc->channel[swizzle].normalized)) {
+            return FALSE;
+         }
+      }
+   }
+
+   return TRUE;
+}
+
+
+boolean
+util_format_fits_8unorm(const struct util_format_description *format_desc)
+{
+   unsigned chan;
+
+   /*
+    * After linearized sRGB values require more than 8bits.
+    */
+
+   if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
+      return FALSE;
+   }
+
+   switch (format_desc->layout) {
+
+   case UTIL_FORMAT_LAYOUT_S3TC:
+   case UTIL_FORMAT_LAYOUT_RGTC:
+      /*
+       * These are straight forward.
+       */
+
+      return TRUE;
+
+   case UTIL_FORMAT_LAYOUT_PLAIN:
+      /*
+       * For these we can find a generic rule.
+       */
+
+      for (chan = 0; chan < format_desc->nr_channels; ++chan) {
+         switch (format_desc->channel[chan].type) {
+         case UTIL_FORMAT_TYPE_VOID:
+            break;
+         case UTIL_FORMAT_TYPE_UNSIGNED:
+            if (!format_desc->channel[chan].normalized ||
+                format_desc->channel[chan].size > 8) {
+               return FALSE;
+            }
+            break;
+         default:
+            return FALSE;
+         }
+      }
+      return TRUE;
+
+   default:
+      /*
+       * Handle all others on a case by case basis.
+       */
+
+      switch (format_desc->format) {
+      case PIPE_FORMAT_R1_UNORM:
+      case PIPE_FORMAT_UYVY:
+      case PIPE_FORMAT_YUYV:
+      case PIPE_FORMAT_R8G8_B8G8_UNORM:
+      case PIPE_FORMAT_G8R8_G8B8_UNORM:
+         return TRUE;
+
+      default:
+         return FALSE;
+      }
+   }
+}
+
+
+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)
+{
+   const struct util_format_description *dst_format_desc;
+   const struct util_format_description *src_format_desc;
+   uint8_t *dst_row;
+   const uint8_t *src_row;
+   unsigned x_step, y_step;
+   unsigned dst_step;
+   unsigned src_step;
+
+   dst_format_desc = util_format_description(dst_format);
+   src_format_desc = util_format_description(src_format);
+
+   if (util_is_format_compatible(src_format_desc, dst_format_desc)) {
+      /*
+       * Trivial case.
+       */
+
+      util_copy_rect(dst, dst_format, dst_stride,  dst_x, dst_y,
+                     width, height, src, (int)src_stride,
+                     src_x, src_y);
+      return;
+   }
+
+   assert(dst_x % dst_format_desc->block.width == 0);
+   assert(dst_y % dst_format_desc->block.height == 0);
+   assert(src_x % src_format_desc->block.width == 0);
+   assert(src_y % src_format_desc->block.height == 0);
+
+   dst_row = (uint8_t *)dst + dst_y*dst_stride + dst_x*(dst_format_desc->block.bits/8);
+   src_row = (const uint8_t *)src + src_y*src_stride + src_x*(src_format_desc->block.bits/8);
+
+   /*
+    * This works because all pixel formats have pixel blocks with power of two
+    * sizes.
+    */
+
+   y_step = MAX2(dst_format_desc->block.height, src_format_desc->block.height);
+   x_step = MAX2(dst_format_desc->block.width, src_format_desc->block.width);
+   assert(y_step % dst_format_desc->block.height == 0);
+   assert(y_step % src_format_desc->block.height == 0);
+
+   dst_step = y_step / dst_format_desc->block.height * dst_stride;
+   src_step = y_step / src_format_desc->block.height * src_stride;
+
+   /*
+    * TODO: double formats will loose precision
+    * TODO: Add a special case for formats that are mere swizzles of each other
+    */
+
+   if (util_format_fits_8unorm(src_format_desc) ||
+       util_format_fits_8unorm(dst_format_desc)) {
+      unsigned tmp_stride;
+      uint8_t *tmp_row;
+
+      tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
+      tmp_row = MALLOC(y_step * tmp_stride);
+      if (!tmp_row)
+         return;
+
+      while (height >= y_step) {
+         src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
+         dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
+
+         dst_row += dst_step;
+         src_row += src_step;
+         height -= y_step;
+      }
+
+      if (height) {
+         src_format_desc->unpack_rgba_8unorm(tmp_row, tmp_stride, src_row, src_stride, width, height);
+         dst_format_desc->pack_rgba_8unorm(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
+      }
+
+      FREE(tmp_row);
+   }
+   else {
+      unsigned tmp_stride;
+      float *tmp_row;
+
+      tmp_stride = MAX2(width, x_step) * 4 * sizeof *tmp_row;
+      tmp_row = MALLOC(y_step * tmp_stride);
+      if (!tmp_row)
+         return;
+
+      while (height >= y_step) {
+         src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, y_step);
+         dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, y_step);
+
+         dst_row += dst_step;
+         src_row += src_step;
+         height -= y_step;
+      }
+
+      if (height) {
+         src_format_desc->unpack_rgba_float(tmp_row, tmp_stride, src_row, src_stride, width, height);
+         dst_format_desc->pack_rgba_float(dst_row, dst_stride, tmp_row, tmp_stride, width, height);
+      }
+
+      FREE(tmp_row);
+   }
+}
+
+void util_format_compose_swizzles(const unsigned char swz1[4],
+                                  const unsigned char swz2[4],
+                                  unsigned char dst[4])
+{
+   unsigned i;
+
+   for (i = 0; i < 4; i++) {
+      dst[i] = swz2[i] <= UTIL_FORMAT_SWIZZLE_W ?
+               swz1[swz2[i]] : swz2[i];
+   }
+}
+
+void util_format_swizzle_4f(float *dst, const float *src,
+                            const unsigned char swz[4])
+{
+   unsigned i;
+
+   for (i = 0; i < 4; i++) {
+      if (swz[i] <= UTIL_FORMAT_SWIZZLE_W)
+         dst[i] = src[swz[i]];
+      else if (swz[i] == UTIL_FORMAT_SWIZZLE_0)
+         dst[i] = 0;
+      else if (swz[i] == UTIL_FORMAT_SWIZZLE_1)
+         dst[i] = 1;
+   }
+}
+
+void util_format_unswizzle_4f(float *dst, const float *src,
+                              const unsigned char swz[4])
+{
+   unsigned i;
+
+   for (i = 0; i < 4; i++) {
+      switch (swz[i]) {
+      case UTIL_FORMAT_SWIZZLE_X:
+         dst[0] = src[i];
+         break;
+      case UTIL_FORMAT_SWIZZLE_Y:
+         dst[1] = src[i];
+         break;
+      case UTIL_FORMAT_SWIZZLE_Z:
+         dst[2] = src[i];
+         break;
+      case UTIL_FORMAT_SWIZZLE_W:
+         dst[3] = src[i];
+         break;
+      }
+   }
+}