Mac Overlays: Add sandwich strategy

cc/output/overlay_strategy_common.cc

 // Copyright 2015 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/overlay_strategy_common.h"
 
 #include <limits>
 
 #include "cc/quads/io_surface_draw_quad.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/stream_video_draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/resource_provider.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 OverlayStrategyCommon::OverlayStrategyCommon(
-    OverlayCandidateValidator* capability_checker)
-    : capability_checker_(capability_checker) {
-}
+    OverlayCandidateValidator* capability_checker,
+    OverlayStrategyCommonDelegate* delegate)
+    : capability_checker_(capability_checker), delegate_(delegate) {}
 
 OverlayStrategyCommon::~OverlayStrategyCommon() {
 }
 
 bool OverlayStrategyCommon::Attempt(RenderPassList* render_passes_in_draw_order,
-                                    OverlayCandidateList* candidate_list) {
+                                    OverlayCandidateList* candidate_list,
+                                    float device_scale_factor) {
   if (!capability_checker_)
     return false;
   RenderPass* root_render_pass = render_passes_in_draw_order->back();
   DCHECK(root_render_pass);
 
   QuadList& quad_list = root_render_pass->quad_list;
   for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
     OverlayCandidate candidate;
     const DrawQuad* draw_quad = *it;
     if (IsOverlayQuad(draw_quad) &&
         GetCandidateQuadInfo(*draw_quad, &candidate) &&
-        TryOverlay(capability_checker_, render_passes_in_draw_order,
-                   candidate_list, candidate, it))
+        delegate_->TryOverlay(capability_checker_, render_passes_in_draw_order,
+                              candidate_list, candidate, it,
+                              device_scale_factor))
       return true;
   }
   return false;
 }
 
 bool OverlayStrategyCommon::IsOverlayQuad(const DrawQuad* draw_quad) {
   switch (draw_quad->material) {
     case DrawQuad::TEXTURE_CONTENT:
       return TextureDrawQuad::MaterialCast(draw_quad)->allow_overlay();
     case DrawQuad::STREAM_VIDEO_CONTENT:
       return StreamVideoDrawQuad::MaterialCast(draw_quad)->allow_overlay();
     case DrawQuad::IO_SURFACE_CONTENT:
       return IOSurfaceDrawQuad::MaterialCast(draw_quad)->allow_overlay;
     default:
       return false;
   }
 }
 
+// static
 bool OverlayStrategyCommon::IsInvisibleQuad(const DrawQuad* draw_quad) {
   if (draw_quad->material == DrawQuad::SOLID_COLOR) {
     const SolidColorDrawQuad* solid_quad =
         SolidColorDrawQuad::MaterialCast(draw_quad);
     SkColor color = solid_quad->color;
     float opacity = solid_quad->shared_quad_state->opacity;
     float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
     return solid_quad->ShouldDrawWithBlending() &&
            alpha < std::numeric_limits<float>::epsilon();
   }
@@ skipping 100 matching lines @@
       return false;
   }
 
   quad_info->format = RGBA_8888;
   quad_info->display_rect = OverlayCandidate::GetOverlayRect(
       draw_quad.shared_quad_state->quad_to_target_transform, draw_quad.rect);
   return true;
 }
 
 }  // namespace cc