cc: Fix vertex opacity shaders

cc/output/renderer_pixeltest.cc

 // Copyright 2012 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 <stddef.h>
 #include <stdint.h>
 #include <memory>
 
 #include "base/message_loop/message_loop.h"
 #include "cc/base/math_util.h"
@@ skipping 134 matching lines @@
   TextureDrawQuad* quad =
       render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
   quad->SetNew(shared_state, rect, gfx::Rect(), rect, resource,
                premultiplied_alpha, uv_top_left, uv_bottom_right,
                background_color, vertex_opacity, flipped, nearest_neighbor,
                false);
 }
 
 void CreateTestTextureDrawQuad(const gfx::Rect& rect,
                                SkColor texel_color,
+                               float vertex_opacity[4],
                                SkColor background_color,
                                bool premultiplied_alpha,
                                const SharedQuadState* shared_state,
                                ResourceProvider* resource_provider,
                                RenderPass* render_pass) {
   SkPMColor pixel_color = premultiplied_alpha ?
       SkPreMultiplyColor(texel_color) :
       SkPackARGB32NoCheck(SkColorGetA(texel_color),
                           SkColorGetR(texel_color),
                           SkColorGetG(texel_color),
                           SkColorGetB(texel_color));
   size_t num_pixels = static_cast<size_t>(rect.width()) * rect.height();
   std::vector<uint32_t> pixels(num_pixels, pixel_color);
 
   ResourceId resource = resource_provider->CreateResource(
       rect.size(), ResourceProvider::TEXTURE_HINT_IMMUTABLE, RGBA_8888,
       gfx::ColorSpace());
   resource_provider->CopyToResource(
       resource, reinterpret_cast<uint8_t*>(&pixels.front()), rect.size());
 
-  float vertex_opacity[4] = {1.0f, 1.0f, 1.0f, 1.0f};
-
   const gfx::PointF uv_top_left(0.0f, 0.0f);
   const gfx::PointF uv_bottom_right(1.0f, 1.0f);
   const bool flipped = false;
   const bool nearest_neighbor = false;
   TextureDrawQuad* quad =
       render_pass->CreateAndAppendDrawQuad<TextureDrawQuad>();
   quad->SetNew(shared_state, rect, gfx::Rect(), rect, resource,
                premultiplied_alpha, uv_top_left, uv_bottom_right,
                background_color, vertex_opacity, flipped, nearest_neighbor,
                false);
 }
 
+void CreateTestTextureDrawQuad(const gfx::Rect& rect,
+                               SkColor texel_color,
+                               SkColor background_color,
+                               bool premultiplied_alpha,
+                               const SharedQuadState* shared_state,
+                               ResourceProvider* resource_provider,
+                               RenderPass* render_pass) {
+  float vertex_opacity[4] = {1.0f, 1.0f, 1.0f, 1.0f};
+  CreateTestTextureDrawQuad(rect, texel_color, vertex_opacity, background_color,
+                            premultiplied_alpha, shared_state,
+                            resource_provider, render_pass);
+}
+
 void CreateTestYUVVideoDrawQuad_FromVideoFrame(
     const SharedQuadState* shared_state,
     scoped_refptr<media::VideoFrame> video_frame,
     uint8_t alpha_value,
     const gfx::RectF& tex_coord_rect,
     RenderPass* render_pass,
     VideoResourceUpdater* video_resource_updater,
     const gfx::Rect& rect,
     const gfx::Rect& visible_rect,
     ResourceProvider* resource_provider) {
@@ skipping 587 matching lines @@
 
   RenderPassList pass_list;
   pass_list.push_back(std::move(pass));
 
   EXPECT_TRUE(this->RunPixelTest(
       &pass_list,
       base::FilePath(FILE_PATH_LITERAL("green_alpha.png")),
       FuzzyPixelOffByOneComparator(true)));
 }
 
+TEST_F(GLRendererPixelTest,
+       PremultipliedTextureWithBackgroundAndVertexOpacity) {
+  gfx::Rect rect(this->device_viewport_size_);
+
+  int id = 1;
+  std::unique_ptr<RenderPass> pass = CreateTestRootRenderPass(id, rect);
+
+  SharedQuadState* texture_quad_state =
+      CreateTestSharedQuadState(gfx::Transform(), rect, pass.get());
+  texture_quad_state->opacity = 0.8f;
+
+  float vertex_opacity[4] = {1.f, 1.f, 0.f, 0.f};
+  CreateTestTextureDrawQuad(gfx::Rect(this->device_viewport_size_),
+                            SkColorSetARGB(204, 120, 255, 120),  // Texel color.
+                            vertex_opacity,
+                            SK_ColorGREEN,  // Background color.
+                            true,           // Premultiplied alpha.
+                            texture_quad_state, this->resource_provider_.get(),
+                            pass.get());
+
+  SharedQuadState* color_quad_state =
+      CreateTestSharedQuadState(gfx::Transform(), rect, pass.get());
+  SolidColorDrawQuad* color_quad =
+      pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
+  color_quad->SetNew(color_quad_state, rect, rect, SK_ColorWHITE, false);
+
+  RenderPassList pass_list;
+  pass_list.push_back(std::move(pass));
+
+  EXPECT_TRUE(this->RunPixelTest(
+      &pass_list,
+      base::FilePath(FILE_PATH_LITERAL("green_alpha_vertex_opacity.png")),
+      FuzzyPixelOffByOneComparator(true)));
+}
+
 template <typename TypeParam>
 class IntersectingQuadPixelTest : public RendererPixelTest<TypeParam> {
  protected:
   void SetupQuadStateAndRenderPass() {
     // This sets up a pair of draw quads. They are both rotated
     // relative to the root plane, they are also rotated relative to each other.
     // The intersect in the middle at a non-perpendicular angle so that any
     // errors are hopefully magnified.
     // The quads should intersect correctly, as in the front quad should only
     // be partially in front of the back quad, and partially behind.
@@ skipping 2513 matching lines @@
 
   EXPECT_TRUE(this->RunPixelTest(&pass_list, base::FilePath(FILE_PATH_LITERAL(
                                                  "translucent_rectangles.png")),
                                  ExactPixelComparator(true)));
 }
 
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace
 }  // namespace cc