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/*
* Copyright (C) Research In Motion Limited 2011. 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.
*/
#include "third_party/blink/renderer/platform/graphics/filters/fe_drop_shadow.h"
#include "third_party/blink/renderer/platform/graphics/filters/fe_gaussian_blur.h"
#include "third_party/blink/renderer/platform/graphics/filters/filter.h"
#include "third_party/blink/renderer/platform/graphics/filters/paint_filter_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/text_stream.h"
namespace blink {
FEDropShadow::FEDropShadow(Filter* filter,
float std_x,
float std_y,
float dx,
float dy,
const Color& shadow_color,
float shadow_opacity)
: FilterEffect(filter),
std_x_(std_x),
std_y_(std_y),
dx_(dx),
dy_(dy),
shadow_color_(shadow_color),
shadow_opacity_(shadow_opacity) {}
FloatRect FEDropShadow::MapEffect(const FloatSize& std_deviation,
const FloatPoint& offset,
const FloatRect& rect) {
FloatRect offset_rect = rect;
offset_rect.MoveBy(offset);
FloatRect blurred_rect =
FEGaussianBlur::MapEffect(std_deviation, offset_rect);
return UnionRect(blurred_rect, rect);
}
FloatRect FEDropShadow::MapEffect(const FloatRect& rect) const {
const Filter* filter = this->GetFilter();
DCHECK(filter);
FloatPoint offset(filter->ApplyHorizontalScale(dx_),
filter->ApplyVerticalScale(dy_));
FloatSize std_error(filter->ApplyHorizontalScale(std_x_),
filter->ApplyVerticalScale(std_y_));
return MapEffect(std_error, offset, rect);
}
sk_sp<PaintFilter> FEDropShadow::CreateImageFilter() {
sk_sp<PaintFilter> input(paint_filter_builder::Build(
InputEffect(0), OperatingInterpolationSpace()));
float dx = GetFilter()->ApplyHorizontalScale(dx_);
float dy = GetFilter()->ApplyVerticalScale(dy_);
float std_x = GetFilter()->ApplyHorizontalScale(std_x_);
float std_y = GetFilter()->ApplyVerticalScale(std_y_);
Color color = AdaptColorToOperatingInterpolationSpace(
shadow_color_.CombineWithAlpha(shadow_opacity_));
base::Optional<PaintFilter::CropRect> crop_rect = GetCropRect();
return sk_make_sp<DropShadowPaintFilter>(
SkFloatToScalar(dx), SkFloatToScalar(dy), SkFloatToScalar(std_x),
SkFloatToScalar(std_y), color.Rgb(),
DropShadowPaintFilter::ShadowMode::kDrawShadowAndForeground,
std::move(input), base::OptionalOrNullptr(crop_rect));
}
WTF::TextStream& FEDropShadow::ExternalRepresentation(WTF::TextStream& ts,
int indent) const {
WriteIndent(ts, indent);
ts << "[feDropShadow";
FilterEffect::ExternalRepresentation(ts);
ts << " stdDeviation=\"" << std_x_ << ", " << std_y_ << "\" dx=\"" << dx_
<< "\" dy=\"" << dy_ << "\" flood-color=\""
<< shadow_color_.NameForLayoutTreeAsText() << "\" flood-opacity=\""
<< shadow_opacity_ << "]\n";
InputEffect(0)->ExternalRepresentation(ts, indent + 1);
return ts;
}
} // namespace blink
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