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/*
* Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2012 University of Szeged
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "third_party/blink/renderer/platform/graphics/filters/filter_effect.h"
#include "third_party/blink/renderer/platform/graphics/filters/filter.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
namespace blink {
FilterEffect::FilterEffect(Filter* filter)
: filter_(filter),
clips_to_bounds_(true),
origin_tainted_(false),
operating_interpolation_space_(kInterpolationSpaceLinear) {
DCHECK(filter_);
}
FilterEffect::~FilterEffect() = default;
void FilterEffect::Trace(blink::Visitor* visitor) {
visitor->Trace(input_effects_);
visitor->Trace(filter_);
}
FloatRect FilterEffect::AbsoluteBounds() const {
FloatRect computed_bounds = GetFilter()->FilterRegion();
if (!FilterPrimitiveSubregion().IsEmpty())
computed_bounds.Intersect(FilterPrimitiveSubregion());
return GetFilter()->MapLocalRectToAbsoluteRect(computed_bounds);
}
FloatRect FilterEffect::MapInputs(const FloatRect& rect) const {
if (!input_effects_.size()) {
if (ClipsToBounds())
return AbsoluteBounds();
return rect;
}
FloatRect input_union;
for (const auto& effect : input_effects_)
input_union.Unite(effect->MapRect(rect));
return input_union;
}
FloatRect FilterEffect::MapEffect(const FloatRect& rect) const {
return rect;
}
FloatRect FilterEffect::ApplyBounds(const FloatRect& rect) const {
// Filters in SVG clip to primitive subregion, while CSS doesn't.
if (!ClipsToBounds())
return rect;
FloatRect bounds = AbsoluteBounds();
if (AffectsTransparentPixels())
return bounds;
return Intersection(rect, bounds);
}
FloatRect FilterEffect::MapRect(const FloatRect& rect) const {
FloatRect result = MapInputs(rect);
result = MapEffect(result);
return ApplyBounds(result);
}
FilterEffect* FilterEffect::InputEffect(unsigned number) const {
SECURITY_DCHECK(number < input_effects_.size());
return input_effects_.at(number).Get();
}
void FilterEffect::DisposeImageFilters() {
for (int i = 0; i < 4; i++)
image_filters_[i] = nullptr;
}
void FilterEffect::DisposeImageFiltersRecursive() {
if (!HasImageFilter())
return;
DisposeImageFilters();
for (auto& effect : input_effects_)
effect->DisposeImageFiltersRecursive();
}
Color FilterEffect::AdaptColorToOperatingInterpolationSpace(
const Color& device_color) {
// |deviceColor| is assumed to be DeviceRGB.
return interpolation_space_utilities::ConvertColor(
device_color, OperatingInterpolationSpace());
}
WTF::TextStream& FilterEffect::ExternalRepresentation(WTF::TextStream& ts,
int) const {
// FIXME: We should dump the subRegions of the filter primitives here later.
// This isn't possible at the moment, because we need more detailed
// information from the target object.
return ts;
}
sk_sp<PaintFilter> FilterEffect::CreateImageFilter() {
return nullptr;
}
sk_sp<PaintFilter> FilterEffect::CreateImageFilterWithoutValidation() {
return CreateImageFilter();
}
bool FilterEffect::InputsTaintOrigin() const {
for (const Member<FilterEffect>& effect : input_effects_) {
if (effect->OriginTainted())
return true;
}
return false;
}
sk_sp<PaintFilter> FilterEffect::CreateTransparentBlack() const {
PaintFilter::CropRect rect = GetCropRect();
sk_sp<SkColorFilter> color_filter =
SkColorFilter::MakeModeFilter(0, SkBlendMode::kClear);
return sk_make_sp<ColorFilterPaintFilter>(std::move(color_filter), nullptr,
&rect);
}
PaintFilter::CropRect FilterEffect::GetCropRect() const {
if (!FilterPrimitiveSubregion().IsEmpty()) {
FloatRect rect =
GetFilter()->MapLocalRectToAbsoluteRect(FilterPrimitiveSubregion());
return PaintFilter::CropRect(rect);
} else {
return PaintFilter::CropRect(SkRect::MakeEmpty(), 0);
}
}
static int GetImageFilterIndex(InterpolationSpace interpolation_space,
bool requires_pm_color_validation) {
// Map the (colorspace, bool) tuple to an integer index as follows:
// 0 == linear colorspace, no PM validation
// 1 == device colorspace, no PM validation
// 2 == linear colorspace, PM validation
// 3 == device colorspace, PM validation
return (interpolation_space == kInterpolationSpaceLinear ? 0x1 : 0x0) |
(requires_pm_color_validation ? 0x2 : 0x0);
}
PaintFilter* FilterEffect::GetImageFilter(
InterpolationSpace interpolation_space,
bool requires_pm_color_validation) const {
int index =
GetImageFilterIndex(interpolation_space, requires_pm_color_validation);
return image_filters_[index].get();
}
void FilterEffect::SetImageFilter(InterpolationSpace interpolation_space,
bool requires_pm_color_validation,
sk_sp<PaintFilter> image_filter) {
int index =
GetImageFilterIndex(interpolation_space, requires_pm_color_validation);
image_filters_[index] = std::move(image_filter);
}
} // namespace blink
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