1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "cc/output/overlay_strategy_single_on_top.h" 6 7 #include "cc/output/output_surface.h" 8 #include "cc/quads/draw_quad.h" 9 #include "cc/quads/texture_draw_quad.h" 10 #include "ui/gfx/rect_conversions.h" 11 #include "ui/gfx/transform.h" 12 13 namespace cc { 14 15 OverlayStrategySingleOnTop::OverlayStrategySingleOnTop( 16 OverlayCandidateValidator* capability_checker, 17 ResourceProvider* resource_provider) 18 : capability_checker_(capability_checker), 19 resource_provider_(resource_provider) {} 20 21 bool OverlayStrategySingleOnTop::Attempt( 22 RenderPassList* render_passes_in_draw_order, 23 OverlayCandidateList* candidate_list) { 24 // Only attempt to handle very simple case for now. 25 if (!capability_checker_) 26 return false; 27 28 RenderPass* root_render_pass = render_passes_in_draw_order->back(); 29 DCHECK(root_render_pass); 30 31 QuadList& quad_list = root_render_pass->quad_list; 32 const DrawQuad* candidate_quad = quad_list.front(); 33 if (candidate_quad->material != DrawQuad::TEXTURE_CONTENT) 34 return false; 35 36 const TextureDrawQuad& quad = *TextureDrawQuad::MaterialCast(candidate_quad); 37 if (!resource_provider_->AllowOverlay(quad.resource_id)) 38 return false; 39 40 // Simple quads only. 41 gfx::OverlayTransform overlay_transform = 42 OverlayCandidate::GetOverlayTransform(quad.quadTransform(), quad.flipped); 43 if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID || 44 !quad.quadTransform().IsIdentityOrTranslation() || quad.needs_blending || 45 quad.shared_quad_state->opacity != 1.f || 46 quad.shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode || 47 quad.premultiplied_alpha || quad.background_color != SK_ColorTRANSPARENT) 48 return false; 49 50 // Add our primary surface. 51 OverlayCandidateList candidates; 52 OverlayCandidate main_image; 53 main_image.display_rect = root_render_pass->output_rect; 54 main_image.format = RGBA_8888; 55 candidates.push_back(main_image); 56 57 // Add the overlay. 58 OverlayCandidate candidate; 59 candidate.transform = overlay_transform; 60 candidate.display_rect = 61 OverlayCandidate::GetOverlayRect(quad.quadTransform(), quad.rect); 62 candidate.uv_rect = BoundingRect(quad.uv_top_left, quad.uv_bottom_right); 63 candidate.format = RGBA_8888; 64 candidate.resource_id = quad.resource_id; 65 candidate.plane_z_order = 1; 66 candidates.push_back(candidate); 67 68 // Check for support. 69 capability_checker_->CheckOverlaySupport(&candidates); 70 71 // If the candidate can be handled by an overlay, create a pass for it. 72 if (candidates[1].overlay_handled) { 73 scoped_ptr<DrawQuad> overlay_quad = quad_list.take(quad_list.begin()); 74 quad_list.erase(quad_list.begin()); 75 candidate_list->swap(candidates); 76 return true; 77 } 78 return false; 79 } 80 81 } // namespace cc 82
