commit 676dc8f916e2cd6eae579932ad36a188efd9cb09
author shannon.woods%transgaming.com@gtempaccount.com <shannon.woods%transgaming.com@gtempaccount.com@736b8ea6-26fd-11df-bfd4-992fa37f6226> Sat Apr 13 03:35:13 2013 +0000
committer shannon.woods%transgaming.com@gtempaccount.com <shannon.woods%transgaming.com@gtempaccount.com@736b8ea6-26fd-11df-bfd4-992fa37f6226> Sat Apr 13 03:35:13 2013 +0000
tree 38e9c4c7ec4788e8b3ca749d847e9f0b844b6fa8
parent 14eb55e5e7e40c4e9f9611c5760a600acc6679ae

Fast path for BGRA to RGBA readPixels conversions.

From http://code.google.com/p/angleproject/source/detail?r=1999

TRAC #22825

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2104 736b8ea6-26fd-11df-bfd4-992fa37f6226

src/libGLESv2/renderer/Renderer9.cpp

diff --git a/src/libGLESv2/renderer/Renderer9.cpp b/src/libGLESv2/renderer/Renderer9.cpp
index 4524c35..1966ea6 100644
--- a/src/libGLESv2/renderer/Renderer9.cpp
+++ b/src/libGLESv2/renderer/Renderer9.cpp
@@ -2842,6 +2842,21 @@
                    (rect.right - rect.left) * fastPixelSize);
             continue;
         }
+        else if (desc.Format == D3DFMT_A8R8G8B8 &&
+                 format == GL_RGBA &&
+                 type == GL_UNSIGNED_BYTE)
+        {
+            // Fast path for swapping red with blue
+            for (int i = 0; i < rect.right - rect.left; i++)
+            {
+                unsigned int argb = *(unsigned int*)(source + 4 * i + j * inputPitch);
+                *(unsigned int*)(dest + 4 * i + j * outputPitch) =
+                    (argb & 0xFF00FF00) |       // Keep alpha and green
+                    (argb & 0x00FF0000) >> 16 | // Move red to blue
+                    (argb & 0x000000FF) << 16;  // Move blue to red
+            }
+            continue;
+        }
 
         for (int i = 0; i < rect.right - rect.left; i++)
         {