# HG changeset patch
# Parent 8b838be49f115022e403c850c24b28ad62d72ad6
diff --git a/gfx/angle/src/libGLESv2/Context.cpp b/gfx/angle/src/libGLESv2/Context.cpp
--- a/gfx/angle/src/libGLESv2/Context.cpp
+++ b/gfx/angle/src/libGLESv2/Context.cpp
@@ -2518,16 +2518,17 @@ void Context::readPixels(GLint x, GLint 
     {
         if (desc.Format == D3DFMT_A8R8G8B8 &&
             format == GL_BGRA_EXT &&
             type == GL_UNSIGNED_BYTE)
         {
             // Fast path for EXT_read_format_bgra, given
             // an RGBA source buffer.  Note that buffers with no
             // alpha go through the slow path below.
+            // Note that this is also the combo exposed by IMPLEMENTATION_COLOR_READ_TYPE/FORMAT
             memcpy(dest + j * outputPitch,
                    source + j * inputPitch,
                    (rect.right - rect.left) * 4);
             continue;
         }
 
         for (int i = 0; i < rect.right - rect.left; i++)
         {
@@ -2665,20 +2666,20 @@ void Context::readPixels(GLint x, GLint 
                         ((unsigned short)(     a + 0.5f) << 15) |
                         ((unsigned short)(31 * r + 0.5f) << 10) |
                         ((unsigned short)(31 * g + 0.5f) << 5) |
                         ((unsigned short)(31 * b + 0.5f) << 0);
                     break;
                   default: UNREACHABLE();
                 }
                 break;
-              case GL_RGB:   // IMPLEMENTATION_COLOR_READ_FORMAT
+              case GL_RGB:
                 switch (type)
                 {
-                  case GL_UNSIGNED_SHORT_5_6_5:   // IMPLEMENTATION_COLOR_READ_TYPE
+                  case GL_UNSIGNED_SHORT_5_6_5:
                     dest16[i + j * outputPitch / sizeof(unsigned short)] = 
                         ((unsigned short)(31 * b + 0.5f) << 0) |
                         ((unsigned short)(63 * g + 0.5f) << 5) |
                         ((unsigned short)(31 * r + 0.5f) << 11);
                     break;
                   default: UNREACHABLE();
                 }
                 break;
diff --git a/gfx/angle/src/libGLESv2/Context.h b/gfx/angle/src/libGLESv2/Context.h
--- a/gfx/angle/src/libGLESv2/Context.h
+++ b/gfx/angle/src/libGLESv2/Context.h
@@ -69,18 +69,18 @@ enum
     MAX_VARYING_VECTORS_SM3 = 10,
     MAX_TEXTURE_IMAGE_UNITS = 16,
     MAX_VERTEX_TEXTURE_IMAGE_UNITS_VTF = 4,   // For devices supporting vertex texture fetch
     MAX_COMBINED_TEXTURE_IMAGE_UNITS_VTF = MAX_TEXTURE_IMAGE_UNITS + MAX_VERTEX_TEXTURE_IMAGE_UNITS_VTF,    
     MAX_FRAGMENT_UNIFORM_VECTORS_SM2 = 32 - 3,    // Reserve space for dx_Coord, dx_Depth, and dx_DepthRange. dx_PointOrLines and dx_FrontCCW use separate bool registers.
     MAX_FRAGMENT_UNIFORM_VECTORS_SM3 = 224 - 3,
     MAX_DRAW_BUFFERS = 1,
 
-    IMPLEMENTATION_COLOR_READ_FORMAT = GL_RGB,
-    IMPLEMENTATION_COLOR_READ_TYPE = GL_UNSIGNED_SHORT_5_6_5
+    IMPLEMENTATION_COLOR_READ_FORMAT = GL_BGRA_EXT,
+    IMPLEMENTATION_COLOR_READ_TYPE = GL_UNSIGNED_BYTE
 };
 
 enum QueryType
 {
     QUERY_ANY_SAMPLES_PASSED,
     QUERY_ANY_SAMPLES_PASSED_CONSERVATIVE,
 
     QUERY_TYPE_COUNT