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// 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_sandwich.h"
#include "cc/base/math_util.h"
#include "cc/base/region.h"
#include "cc/output/overlay_candidate_validator.h"
#include "cc/quads/draw_quad.h"
#include "cc/quads/solid_color_draw_quad.h"
namespace cc {
namespace {
void ClipDisplayAndUVRects(gfx::Rect* display_rect,
gfx::RectF* uv_rect,
const gfx::Rect& clip_rect) {
gfx::Rect display_cropped_rect =
gfx::IntersectRects(*display_rect, clip_rect);
gfx::RectF uv_cropped_rect = gfx::RectF(display_cropped_rect);
uv_cropped_rect -= gfx::Vector2dF(display_rect->x(), display_rect->y());
uv_cropped_rect.Scale(uv_rect->width() / display_rect->width(),
uv_rect->height() / display_rect->height());
uv_cropped_rect += gfx::Vector2dF(uv_rect->x(), uv_rect->y());
*display_rect = display_cropped_rect;
*uv_rect = uv_cropped_rect;
}
} // namespace
OverlayStrategySandwich::~OverlayStrategySandwich() {}
OverlayResult OverlayStrategySandwich::TryOverlay(
OverlayCandidateValidator* capability_checker,
RenderPassList* render_passes_in_draw_order,
OverlayCandidateList* candidate_list,
const OverlayCandidate& candidate,
QuadList::Iterator* candidate_iter_in_quad_list,
float device_scale_factor) {
RenderPass* root_render_pass = render_passes_in_draw_order->back();
QuadList& quad_list = root_render_pass->quad_list;
gfx::Rect pixel_bounds = root_render_pass->output_rect;
const DrawQuad* candidate_quad = **candidate_iter_in_quad_list;
const gfx::Transform& candidate_transform =
candidate_quad->shared_quad_state->quad_to_target_transform;
gfx::Transform candidate_inverse_transform;
if (!candidate_transform.GetInverse(&candidate_inverse_transform))
return DID_NOT_CREATE_OVERLAY;
// Compute the candidate's rect in display space (pixels on the screen).
gfx::Rect candidate_pixel_rect = candidate.quad_rect_in_target_space;
gfx::RectF candidate_uv_rect = candidate.uv_rect;
if (candidate.is_clipped &&
!candidate.clip_rect.Contains(candidate_pixel_rect)) {
ClipDisplayAndUVRects(&candidate_pixel_rect, &candidate_uv_rect,
candidate.clip_rect);
}
// Don't allow overlapping overlays for now.
for (const OverlayCandidate& other_candidate : *candidate_list) {
if (other_candidate.display_rect.Intersects(candidate.display_rect) &&
other_candidate.plane_z_order == 1) {
return DID_NOT_CREATE_OVERLAY;
}
}
// Iterate through the quads in front of |candidate|, and compute the region
// of |candidate| that is covered.
Region pixel_covered_region;
for (auto overlap_iter = quad_list.cbegin();
overlap_iter != *candidate_iter_in_quad_list; ++overlap_iter) {
if (OverlayStrategyCommon::IsInvisibleQuad(*overlap_iter))
continue;
// Compute the quad's bounds in display space.
gfx::Rect pixel_covered_rect = MathUtil::MapEnclosingClippedRect(
overlap_iter->shared_quad_state->quad_to_target_transform,
overlap_iter->rect);
// Include the intersection of that quad with the candidate's quad in the
// covered region.
pixel_covered_rect.Intersect(candidate_pixel_rect);
pixel_covered_region.Union(pixel_covered_rect);
}
// Add the candidate's overlay.
DCHECK(candidate.resource_id);
OverlayCandidateList new_candidate_list = *candidate_list;
new_candidate_list.push_back(candidate);
OverlayCandidate& new_candidate = new_candidate_list.back();
new_candidate.plane_z_order = 1;
new_candidate.display_rect = gfx::RectF(candidate_pixel_rect);
new_candidate.quad_rect_in_target_space = candidate_pixel_rect;
new_candidate.uv_rect = candidate_uv_rect;
// Add an overlay of the primary surface for any part of the candidate's
// quad that was covered.
std::vector<gfx::Rect> pixel_covered_rects;
for (Region::Iterator it(pixel_covered_region); it.has_rect(); it.next())
pixel_covered_rects.push_back(it.rect());
for (const gfx::Rect& pixel_covered_rect : pixel_covered_rects) {
OverlayCandidate main_image_on_top;
main_image_on_top.display_rect = gfx::RectF(pixel_covered_rect);
main_image_on_top.uv_rect = gfx::RectF(pixel_covered_rect);
main_image_on_top.uv_rect.Scale(1.f / pixel_bounds.width(),
1.f / pixel_bounds.height());
main_image_on_top.plane_z_order = 2;
main_image_on_top.transform = gfx::OVERLAY_TRANSFORM_NONE;
main_image_on_top.use_output_surface_for_resource = true;
new_candidate_list.push_back(main_image_on_top);
}
// Check for support.
capability_checker->CheckOverlaySupport(&new_candidate_list);
for (const OverlayCandidate& candidate : new_candidate_list) {
if (!candidate.overlay_handled)
return DID_NOT_CREATE_OVERLAY;
}
// Remove the quad for the overlay quad. Replace it with a transparent quad
// if we're putting a new overlay on top.
if (pixel_covered_rects.empty()) {
*candidate_iter_in_quad_list =
quad_list.EraseAndInvalidateAllPointers(*candidate_iter_in_quad_list);
} else {
// Cache the information from the candidate quad that we'll need to
// construct the solid color quads.
const SharedQuadState* candidate_shared_quad_state =
candidate_quad->shared_quad_state;
const gfx::Rect candidate_rect = candidate_quad->rect;
// Reserve space in the quad list for the transparent quads.
quad_list.ReplaceExistingElement<SolidColorDrawQuad>(
*candidate_iter_in_quad_list);
*candidate_iter_in_quad_list =
quad_list.InsertBeforeAndInvalidateAllPointers<SolidColorDrawQuad>(
*candidate_iter_in_quad_list, pixel_covered_rects.size() - 1);
// Cover the region with transparent quads.
for (const gfx::Rect& pixel_covered_rect : pixel_covered_rects) {
gfx::Rect quad_space_covered_rect = MathUtil::MapEnclosingClippedRect(
candidate_inverse_transform, pixel_covered_rect);
quad_space_covered_rect.Intersect(candidate_rect);
SolidColorDrawQuad* transparent_quad =
static_cast<SolidColorDrawQuad*>(**candidate_iter_in_quad_list);
transparent_quad->SetAll(candidate_shared_quad_state,
quad_space_covered_rect, quad_space_covered_rect,
quad_space_covered_rect, false,
SK_ColorTRANSPARENT, true);
++(*candidate_iter_in_quad_list);
}
}
candidate_list->swap(new_candidate_list);
return CREATED_OVERLAY_KEEP_LOOKING;
}
} // namespace cc
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