Fix HTML5 video blurry

cc/output/gl_renderer.cc

 // Copyright 2010 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/gl_renderer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 63 matching lines @@
   gfx::PointF uv0 = quad->uv_top_left;
   gfx::PointF uv1 = quad->uv_bottom_right;
   Float4 xform = {{uv0.x(), uv0.y(), uv1.x() - uv0.x(), uv1.y() - uv0.y()}};
   if (quad->y_flipped) {
     xform.data[1] = 1.0f - xform.data[1];
     xform.data[3] = -xform.data[3];
   }
   return xform;
 }
 
+Float4 UVClampRect(gfx::RectF uv_clamp_rect,
+                   const gfx::Size& texture_size,
+                   SamplerType sampler) {
+  gfx::SizeF half_texel(0.5f, 0.5f);
+  if (sampler != SAMPLER_TYPE_2D_RECT) {
+    half_texel.Scale(1.f / texture_size.width(), 1.f / texture_size.height());
+  } else {
+    uv_clamp_rect.Scale(texture_size.width(), texture_size.height());
+  }
+  uv_clamp_rect.Inset(half_texel.width(), half_texel.height());
+  return {{uv_clamp_rect.x(), uv_clamp_rect.y(), uv_clamp_rect.right(),
+           uv_clamp_rect.bottom()}};
+}
+
 Float4 PremultipliedColor(SkColor color) {
   const float factor = 1.0f / 255.0f;
   const float alpha = SkColorGetA(color) * factor;
 
   Float4 result = {
       {SkColorGetR(color) * factor * alpha, SkColorGetG(color) * factor * alpha,
        SkColorGetB(color) * factor * alpha, alpha}};
   return result;
 }
 
@@ skipping 2384 matching lines @@
                                           quad->resource_id());
 
   DCHECK_EQ(GL_TEXTURE0, GetActiveTextureUnit(gl_));
   gl_->BindTexture(GL_TEXTURE_EXTERNAL_OES, lock.texture_id());
 
   gl_->UniformMatrix4fvStreamTextureMatrixCHROMIUM(
       program->vertex_shader().tex_matrix_location(), false, gl_matrix);
 
   gl_->Uniform1i(program->fragment_shader().sampler_location(), 0);
 
-  SetShaderOpacity(quad->shared_quad_state->opacity,
-                   program->fragment_shader().alpha_location());
+  gfx::Size texture_size = lock.size();
+  gfx::Vector2dF uv = quad->matrix.Scale2d();
+  gfx::RectF uv_clamp_rect(0, 0, uv.x(), uv.y());
+  const SamplerType sampler = SamplerTypeFromTextureTarget(lock.target());
+  Float4 tex_clamp_rect = UVClampRect(uv_clamp_rect, texture_size, sampler);
+  gl_->Uniform4f(program->fragment_shader().tex_clamp_rect_location(),
+                 tex_clamp_rect.data[0], tex_clamp_rect.data[1],
+                 tex_clamp_rect.data[2], tex_clamp_rect.data[3]);
+
   if (!clip_region) {
     DrawQuadGeometry(frame->projection_matrix,
                      quad->shared_quad_state->quad_to_target_transform,
                      gfx::RectF(quad->rect),
                      program->vertex_shader().matrix_location());
   } else {
     gfx::QuadF region_quad(*clip_region);
     region_quad.Scale(1.0f / quad->rect.width(), 1.0f / quad->rect.height());
     region_quad -= gfx::Vector2dF(0.5f, 0.5f);
     float uvs[8] = {0};
@@ skipping 22 matching lines @@
   int background_color_location;
 };
 
 struct TexTransformTextureProgramBinding : TextureProgramBinding {
   template <class Program>
   void Set(Program* program) {
     TextureProgramBinding::Set(program);
     tex_transform_location = program->vertex_shader().tex_transform_location();
     vertex_opacity_location =
         program->vertex_shader().vertex_opacity_location();
+    tex_clamp_rect_location =
+        program->fragment_shader().tex_clamp_rect_location();
   }
   int tex_transform_location;
   int vertex_opacity_location;
+  int tex_clamp_rect_location;
 };
 
 void GLRenderer::FlushTextureQuadCache(BoundGeometry flush_binding) {
   // Check to see if we have anything to draw.
   if (draw_cache_.program_id == -1)
     return;
 
   PrepareGeometry(flush_binding);
 
   // Set the correct blending mode.
@@ skipping 20 matching lines @@
 
   // Upload the tranforms for both points and uvs.
   gl_->UniformMatrix4fv(
       static_cast<int>(draw_cache_.matrix_location),
       static_cast<int>(draw_cache_.matrix_data.size()), false,
       reinterpret_cast<float*>(&draw_cache_.matrix_data.front()));
   gl_->Uniform4fv(static_cast<int>(draw_cache_.uv_xform_location),
                   static_cast<int>(draw_cache_.uv_xform_data.size()),
                   reinterpret_cast<float*>(&draw_cache_.uv_xform_data.front()));
 
+  gl_->Uniform4fv(
+      draw_cache_.tex_clamp_rect_location,
+      static_cast<int>(draw_cache_.tex_clamp_rect_data.size()),
+      reinterpret_cast<float*>(&draw_cache_.tex_clamp_rect_data.front()));
+
   if (draw_cache_.background_color != SK_ColorTRANSPARENT) {
     Float4 background_color = PremultipliedColor(draw_cache_.background_color);
     gl_->Uniform4fv(draw_cache_.background_color_location, 1,
                     background_color.data);
   }
 
   gl_->Uniform1fv(
       static_cast<int>(draw_cache_.vertex_opacity_location),
       static_cast<int>(draw_cache_.vertex_opacity_data.size()),
       static_cast<float*>(&draw_cache_.vertex_opacity_data.front()));
@@ skipping 23 matching lines @@
 
     gl_->LineWidth(3.0f);
     // The indices for the line are stored in the same array as the triangle
     // indices.
     gl_->DrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_SHORT, 0);
   }
 
   // Clear the cache.
   draw_cache_.program_id = -1;
   draw_cache_.uv_xform_data.resize(0);
+  draw_cache_.tex_clamp_rect_data.resize(0);
   draw_cache_.vertex_opacity_data.resize(0);
   draw_cache_.matrix_data.resize(0);
 
   // If we had a clipped binding, prepare the shared binding for the
   // next inserts.
   if (flush_binding == CLIPPED_BINDING) {
     PrepareGeometry(SHARED_BINDING);
   }
 }
 
@@ skipping 44 matching lines @@
       draw_cache_.background_color != quad->background_color ||
       draw_cache_.matrix_data.size() >= max_quads) {
     FlushTextureQuadCache(SHARED_BINDING);
     draw_cache_.program_id = binding.program_id;
     draw_cache_.resource_id = resource_id;
     draw_cache_.needs_blending = quad->ShouldDrawWithBlending();
     draw_cache_.nearest_neighbor = quad->nearest_neighbor;
     draw_cache_.background_color = quad->background_color;
 
     draw_cache_.uv_xform_location = binding.tex_transform_location;
+    draw_cache_.tex_clamp_rect_location = binding.tex_clamp_rect_location;
     draw_cache_.background_color_location = binding.background_color_location;
     draw_cache_.vertex_opacity_location = binding.vertex_opacity_location;
     draw_cache_.matrix_location = binding.matrix_location;
     draw_cache_.sampler_location = binding.sampler_location;
   }
 
   // Generate the uv-transform
   Float4 uv_transform = {{0.0f, 0.0f, 1.0f, 1.0f}};
   if (!clip_region)
     uv_transform = UVTransform(quad);
   if (sampler == SAMPLER_TYPE_2D_RECT) {
     // Un-normalize the texture coordiantes for rectangle targets.
     gfx::Size texture_size = lock.size();
     uv_transform.data[0] *= texture_size.width();
     uv_transform.data[2] *= texture_size.width();
     uv_transform.data[1] *= texture_size.height();
     uv_transform.data[3] *= texture_size.height();
   }
   draw_cache_.uv_xform_data.push_back(uv_transform);
 
+  if (draw_cache_.tex_clamp_rect_location != -1) {
+    // VideoLayerImpl always set background color to transparent.
+    DCHECK(quad->background_color == SK_ColorTRANSPARENT);
+    gfx::Size texture_size = lock.size();
+    if (texture_size.IsEmpty()) {
+      // TODO(dshwang): correct all code coming to here. crbug.com/615325
+      texture_size = quad->rect.size();
+    }
+    gfx::RectF uv_clamp_rect(quad->uv_top_left.x(), quad->uv_top_left.y(),
+                             quad->uv_bottom_right.x() - quad->uv_top_left.x(),
+                             quad->uv_bottom_right.y() - quad->uv_top_left.y());
+    Float4 tex_clamp_rect = UVClampRect(uv_clamp_rect, texture_size, sampler);
+    draw_cache_.tex_clamp_rect_data.push_back(tex_clamp_rect);
+    DCHECK_EQ(draw_cache_.uv_xform_data.size(),
+              draw_cache_.tex_clamp_rect_data.size());
+  }
+
   // Generate the vertex opacity
   const float opacity = quad->shared_quad_state->opacity;
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[0] * opacity);
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[1] * opacity);
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[2] * opacity);
   draw_cache_.vertex_opacity_data.push_back(quad->vertex_opacity[3] * opacity);
 
   // Generate the transform matrix
   gfx::Transform quad_rect_matrix;
   QuadRectTransform(&quad_rect_matrix,
@@ skipping 1332 matching lines @@
 
   gl_->ScheduleCALayerSharedStateCHROMIUM(
       ca_layer_overlay->shared_state->opacity, is_clipped, clip_rect,
       sorting_context_id, gl_transform);
   gl_->ScheduleCALayerCHROMIUM(
       texture_id, contents_rect, ca_layer_overlay->background_color,
       ca_layer_overlay->edge_aa_mask, bounds_rect, filter);
 }
 
 }  // namespace cc