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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) 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_FILTERS_FILTER_EFFECT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_FILTERS_FILTER_EFFECT_H_
#include "base/macros.h"
#include "third_party/blink/renderer/platform/geometry/float_rect.h"
#include "third_party/blink/renderer/platform/geometry/int_rect.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/graphics/interpolation_space.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_filter.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class Filter;
class FilterEffect;
typedef HeapVector<Member<FilterEffect>> FilterEffectVector;
enum FilterEffectType {
kFilterEffectTypeUnknown,
kFilterEffectTypeImage,
kFilterEffectTypeTile,
kFilterEffectTypeSourceInput
};
class PLATFORM_EXPORT FilterEffect : public GarbageCollected<FilterEffect> {
public:
virtual ~FilterEffect();
virtual void Trace(Visitor*);
void DisposeImageFilters();
void DisposeImageFiltersRecursive();
FilterEffectVector& InputEffects() { return input_effects_; }
FilterEffect* InputEffect(unsigned) const;
unsigned NumberOfEffectInputs() const { return input_effects_.size(); }
inline bool HasImageFilter() const {
return image_filters_[0] || image_filters_[1] || image_filters_[2] ||
image_filters_[3];
}
// Clipped primitive subregion in the coordinate space of the target.
FloatRect AbsoluteBounds() const;
// Mapping a rect forwards to determine which which destination pixels a
// given source rect would affect.
FloatRect MapRect(const FloatRect&) const;
virtual sk_sp<PaintFilter> CreateImageFilter();
virtual sk_sp<PaintFilter> CreateImageFilterWithoutValidation();
virtual FilterEffectType GetFilterEffectType() const {
return kFilterEffectTypeUnknown;
}
virtual WTF::TextStream& ExternalRepresentation(WTF::TextStream&,
int indention = 0) const;
FloatRect FilterPrimitiveSubregion() const {
return filter_primitive_subregion_;
}
void SetFilterPrimitiveSubregion(
const FloatRect& filter_primitive_subregion) {
filter_primitive_subregion_ = filter_primitive_subregion;
}
Filter* GetFilter() { return filter_; }
const Filter* GetFilter() const { return filter_; }
bool ClipsToBounds() const { return clips_to_bounds_; }
void SetClipsToBounds(bool value) { clips_to_bounds_ = value; }
InterpolationSpace OperatingInterpolationSpace() const {
return operating_interpolation_space_;
}
virtual void SetOperatingInterpolationSpace(
InterpolationSpace interpolation_space) {
operating_interpolation_space_ = interpolation_space;
}
virtual bool AffectsTransparentPixels() const { return false; }
// Return false if the filter will only operate correctly on valid RGBA
// values, with alpha in [0,255] and each color component in [0, alpha].
virtual bool MayProduceInvalidPreMultipliedPixels() { return false; }
PaintFilter* GetImageFilter(InterpolationSpace,
bool requires_pm_color_validation) const;
void SetImageFilter(InterpolationSpace,
bool requires_pm_color_validation,
sk_sp<PaintFilter>);
bool OriginTainted() const { return origin_tainted_; }
void SetOriginTainted() { origin_tainted_ = true; }
bool InputsTaintOrigin() const;
protected:
FilterEffect(Filter*);
// Determine the contribution from the filter effect's inputs.
virtual FloatRect MapInputs(const FloatRect&) const;
// Apply the contribution from the filter effect's itself. (Like
// expanding with the blur radius etc.)
virtual FloatRect MapEffect(const FloatRect&) const;
// Apply the clip bounds and factor in the effect of
// affectsTransparentPixels().
FloatRect ApplyBounds(const FloatRect&) const;
sk_sp<PaintFilter> CreateTransparentBlack() const;
Color AdaptColorToOperatingInterpolationSpace(const Color& device_color);
PaintFilter::CropRect GetCropRect() const;
private:
FilterEffectVector input_effects_;
Member<Filter> filter_;
// The following member variables are SVG specific and will move to
// LayoutSVGResourceFilterPrimitive.
// See bug https://bugs.webkit.org/show_bug.cgi?id=45614.
// The subregion of a filter primitive according to the SVG Filter
// specification in local coordinates.
FloatRect filter_primitive_subregion_;
// Whether the effect should clip to its primitive region, or expand to use
// the combined region of its inputs.
bool clips_to_bounds_;
bool origin_tainted_;
InterpolationSpace operating_interpolation_space_;
sk_sp<PaintFilter> image_filters_[4];
DISALLOW_COPY_AND_ASSIGN(FilterEffect);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_FILTERS_FILTER_EFFECT_H_
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