Addition of unpremultiply setting to GL_CHROMIUM_copy_texture.

gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc

Index: gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc
===================================================================
--- gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc	(revision 141671)
+++ gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc	(working copy)
@@ -116,6 +116,29 @@
   EXPECT_TRUE(GL_NO_ERROR == glGetError());
 }
 
+// Test that the extension respects the GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM
+// storage setting.
+TEST_F(GLCopyTextureCHROMIUMTest, UnpremultiplyAlpha) {

[apatrick_chromium, 2012/06/14 21:06:29]

How about the unpremultiply flip y variant as well?

[Jeff Timanus, 2012/06/14 22:54:14]

Done.

+  uint8 pixels[1 * 4] = { 16, 16, 16, 128 };
+
+  glBindTexture(GL_TEXTURE_2D, textures_[0]);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+               pixels);
+
+  glPixelStorei(GL_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, GL_TRUE);
+  glCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1], 0, GL_RGBA);
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+
+  uint8 copied_pixels[1 * 4];
+  glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, copied_pixels);
+  EXPECT_EQ(32u, copied_pixels[0]);
+  EXPECT_EQ(32u, copied_pixels[1]);
+  EXPECT_EQ(32u, copied_pixels[2]);
+  EXPECT_EQ(128u, copied_pixels[3]);
+
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+}
+
 TEST_F(GLCopyTextureCHROMIUMTest, FlipYAndPremultiplyAlpha) {
   uint8 pixels[2][2][4];
   for (int x = 0; x < 2; ++x) {