| // Copyright 2014 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_single_on_top.h" |
| |
| #include "cc/output/output_surface.h" |
| #include "cc/quads/draw_quad.h" |
| #include "cc/quads/texture_draw_quad.h" |
| #include "ui/gfx/rect_conversions.h" |
| #include "ui/gfx/transform.h" |
| |
| namespace cc { |
| |
| OverlayStrategySingleOnTop::OverlayStrategySingleOnTop( |
| OverlayCandidateValidator* capability_checker, |
| ResourceProvider* resource_provider) |
| : capability_checker_(capability_checker), |
| resource_provider_(resource_provider) {} |
| |
| bool OverlayStrategySingleOnTop::Attempt( |
| RenderPassList* render_passes_in_draw_order, |
| OverlayCandidateList* candidate_list) { |
| // Only attempt to handle very simple case for now. |
| 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; |
| const DrawQuad* candidate_quad = quad_list.front(); |
| if (candidate_quad->material != DrawQuad::TEXTURE_CONTENT) |
| return false; |
| |
| const TextureDrawQuad& quad = *TextureDrawQuad::MaterialCast(candidate_quad); |
| if (!resource_provider_->AllowOverlay(quad.resource_id)) |
| return false; |
| |
| // Simple quads only. |
| gfx::OverlayTransform overlay_transform = |
| OverlayCandidate::GetOverlayTransform(quad.quadTransform(), quad.flipped); |
| if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID || |
| !quad.quadTransform().IsIdentityOrTranslation() || quad.needs_blending || |
| quad.shared_quad_state->opacity != 1.f || |
| quad.shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode || |
| quad.premultiplied_alpha || quad.background_color != SK_ColorTRANSPARENT) |
| return false; |
| |
| // Add our primary surface. |
| OverlayCandidateList candidates; |
| OverlayCandidate main_image; |
| main_image.display_rect = root_render_pass->output_rect; |
| main_image.format = RGBA_8888; |
| candidates.push_back(main_image); |
| |
| // Add the overlay. |
| OverlayCandidate candidate; |
| candidate.transform = overlay_transform; |
| candidate.display_rect = |
| OverlayCandidate::GetOverlayRect(quad.quadTransform(), quad.rect); |
| candidate.uv_rect = BoundingRect(quad.uv_top_left, quad.uv_bottom_right); |
| candidate.format = RGBA_8888; |
| candidate.resource_id = quad.resource_id; |
| candidate.plane_z_order = 1; |
| candidates.push_back(candidate); |
| |
| // Check for support. |
| capability_checker_->CheckOverlaySupport(&candidates); |
| |
| // If the candidate can be handled by an overlay, create a pass for it. |
| if (candidates[1].overlay_handled) { |
| scoped_ptr<DrawQuad> overlay_quad = quad_list.take(quad_list.begin()); |
| quad_list.erase(quad_list.begin()); |
| candidate_list->swap(candidates); |
| return true; |
| } |
| return false; |
| } |
| |
| } // namespace cc |