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// 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
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