[Ozone] Fix SingleOnTop issue by checking if the quad is clipped.

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/base/math_util.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 {
 
@@ skipping 42 matching lines @@
         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();
   }
   return false;
 }
 
 bool OverlayStrategyCommon::GetTextureQuadInfo(const TextureDrawQuad& quad,

[danakj, 2015/09/01 20:35:25]

How come only video quad needs the clipped stuff?

                                                OverlayCandidate* quad_info) {
   gfx::OverlayTransform overlay_transform =
       OverlayCandidate::GetOverlayTransform(
           quad.shared_quad_state->quad_to_target_transform, quad.y_flipped);
   if (quad.background_color != SK_ColorTRANSPARENT ||
       quad.premultiplied_alpha ||
       overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
     return false;
   quad_info->resource_id = quad.resource_id();
   quad_info->resource_size_in_pixels = quad.resource_size_in_pixels();
@@ skipping 10 matching lines @@
   if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
     return false;
   if (!quad.matrix.IsScaleOrTranslation()) {
     // We cannot handle anything other than scaling & translation for texture
     // coordinates yet.
     return false;
   }
   quad_info->resource_id = quad.resource_id();
   quad_info->resource_size_in_pixels = quad.resource_size_in_pixels();
   quad_info->transform = overlay_transform;
+  quad_info->quad_rect_in_target_space = MathUtil::MapEnclosingClippedRect(
+      quad.shared_quad_state->quad_to_target_transform, quad.rect);
+  quad_info->clip_rect = quad.shared_quad_state->clip_rect;
+  quad_info->is_clipped = quad.shared_quad_state->is_clipped;
 
   gfx::Point3F uv0 = gfx::Point3F(0, 0, 0);
   gfx::Point3F uv1 = gfx::Point3F(1, 1, 0);
   quad.matrix.TransformPoint(&uv0);
   quad.matrix.TransformPoint(&uv1);
   gfx::Vector3dF delta = uv1 - uv0;
   if (delta.x() < 0) {
     quad_info->transform = OverlayCandidate::ModifyTransform(
         quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL);
     float x0 = uv0.x();
@@ skipping 33 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