Always apply UniformMatrix4fvStreamTextureMatrixCHROMIUM matrix argument.

cc/output/shader.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/shader.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 734 matching lines @@
     uniform TexCoordPrecision mat4 texMatrix;
     varying TexCoordPrecision vec2 v_texCoord;
   });
 }
 
 std::string VertexShaderVideoTransform::GetShaderBody() {
   return SHADER0([]() {
     void main() {
       gl_Position = matrix * a_position;
       v_texCoord =
-          vec2(texMatrix * vec4(a_texCoord.x, 1.0 - a_texCoord.y, 0.0, 1.0));
+          vec2(0.0, 1.0) +
+          vec2(1.0, -1.0) * (texMatrix * vec4(a_texCoord.xy, 0.0, 1.0)).xy;

[liberato (no reviews please), 2016/03/31 15:03:16]

is this different?

[Tobias Sargeant, 2016/04/01 11:59:10]

It was different (y flip before matrix multiplication vs. y flip after). It's
gone completely now though.

     }
   });
 }
 
 #define BLEND_MODE_UNIFORMS "s_backdropTexture", \
                             "s_originalBackdropTexture", \
                             "backdropRect"
 #define UNUSED_BLEND_MODE_UNIFORMS (!has_blend_mode() ? 3 : 0)
 #define BLEND_MODE_SET_LOCATIONS(X, POS)                   \
   if (has_blend_mode()) {                                  \
@@ skipping 1480 matching lines @@
     void main() {
       vec4 d4 = min(edge_dist[0], edge_dist[1]);
       vec2 d2 = min(d4.xz, d4.yw);
       float aa = clamp(gl_FragCoord.w * min(d2.x, d2.y), 0.0, 1.0);
       gl_FragColor = color * aa;
     }
   });
 }
 
 }  // namespace cc