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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/trees/occlusion.h"
#include "cc/base/math_util.h"
#include "ui/gfx/geometry/rect.h"
namespace cc {
Occlusion::Occlusion() {
}
Occlusion::Occlusion(const gfx::Transform& draw_transform,
const SimpleEnclosedRegion& occlusion_from_outside_target,
const SimpleEnclosedRegion& occlusion_from_inside_target)
: draw_transform_(draw_transform),
occlusion_from_outside_target_(occlusion_from_outside_target),
occlusion_from_inside_target_(occlusion_from_inside_target) {
}
Occlusion Occlusion::GetOcclusionWithGivenDrawTransform(
const gfx::Transform& transform) const {
return Occlusion(
transform, occlusion_from_outside_target_, occlusion_from_inside_target_);
}
bool Occlusion::HasOcclusion() const {
return !occlusion_from_inside_target_.IsEmpty() ||
!occlusion_from_outside_target_.IsEmpty();
}
bool Occlusion::IsOccluded(const gfx::Rect& content_rect) const {
if (content_rect.IsEmpty())
return true;
if (!HasOcclusion())
return false;
gfx::Rect unoccluded_rect_in_target_surface =
GetUnoccludedRectInTargetSurface(content_rect);
return unoccluded_rect_in_target_surface.IsEmpty();
}
gfx::Rect Occlusion::GetUnoccludedContentRect(
const gfx::Rect& content_rect) const {
if (content_rect.IsEmpty())
return content_rect;
if (!HasOcclusion())
return content_rect;
gfx::Rect unoccluded_rect_in_target_surface =
GetUnoccludedRectInTargetSurface(content_rect);
if (unoccluded_rect_in_target_surface.IsEmpty())
return gfx::Rect();
gfx::Transform inverse_draw_transform(gfx::Transform::kSkipInitialization);
bool ok = draw_transform_.GetInverse(&inverse_draw_transform);
// TODO(ajuma): Skip drawing layers with uninvertible draw transforms, and
// change this to a DCHECK. crbug.com/517170
if (!ok)
return content_rect;
gfx::Rect unoccluded_rect = MathUtil::ProjectEnclosingClippedRect(
inverse_draw_transform, unoccluded_rect_in_target_surface);
unoccluded_rect.Intersect(content_rect);
return unoccluded_rect;
}
gfx::Rect Occlusion::GetUnoccludedRectInTargetSurface(
const gfx::Rect& content_rect) const {
// Take the ToEnclosingRect at each step, as we want to contain any unoccluded
// partial pixels in the resulting Rect.
gfx::Rect unoccluded_rect_in_target_surface =
MathUtil::MapEnclosingClippedRect(draw_transform_, content_rect);
DCHECK_LE(occlusion_from_inside_target_.GetRegionComplexity(), 1u);
DCHECK_LE(occlusion_from_outside_target_.GetRegionComplexity(), 1u);
// These subtract operations are more lossy than if we did both operations at
// once.
unoccluded_rect_in_target_surface.Subtract(
occlusion_from_inside_target_.bounds());
unoccluded_rect_in_target_surface.Subtract(
occlusion_from_outside_target_.bounds());
return unoccluded_rect_in_target_surface;
}
bool Occlusion::IsEqual(const Occlusion& other) const {
return draw_transform_ == other.draw_transform_ &&
occlusion_from_inside_target_ == other.occlusion_from_inside_target_ &&
occlusion_from_outside_target_ == other.occlusion_from_outside_target_;
}
std::string Occlusion::ToString() const {
return draw_transform_.ToString() + "outside(" +
occlusion_from_outside_target_.ToString() + ") inside(" +
occlusion_from_inside_target_.ToString() + ")";
}
} // namespace cc
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