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/*
* Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
* Copyright (C) 2005 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* 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_color_matrix.h"
#include "third_party/blink/renderer/platform/graphics/filters/paint_filter_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/text_stream.h"
#include "third_party/skia/include/effects/SkColorFilterImageFilter.h"
#include "third_party/skia/include/effects/SkColorMatrixFilter.h"
namespace blink {
static const unsigned kColorMatrixSize = 20;
FEColorMatrix::FEColorMatrix(Filter* filter,
ColorMatrixType type,
Vector<float> values)
: FilterEffect(filter), type_(type), values_(std::move(values)) {}
ColorMatrixType FEColorMatrix::GetType() const {
return type_;
}
bool FEColorMatrix::SetType(ColorMatrixType type) {
if (type_ == type)
return false;
type_ = type;
return true;
}
const Vector<float>& FEColorMatrix::Values() const {
return values_;
}
bool FEColorMatrix::SetValues(Vector<float> values) {
if (values_ == values)
return false;
values_ = std::move(values);
return true;
}
static void SaturateMatrix(float s, float matrix[kColorMatrixSize]) {
matrix[0] = 0.213f + 0.787f * s;
matrix[1] = 0.715f - 0.715f * s;
matrix[2] = 0.072f - 0.072f * s;
matrix[3] = matrix[4] = 0;
matrix[5] = 0.213f - 0.213f * s;
matrix[6] = 0.715f + 0.285f * s;
matrix[7] = 0.072f - 0.072f * s;
matrix[8] = matrix[9] = 0;
matrix[10] = 0.213f - 0.213f * s;
matrix[11] = 0.715f - 0.715f * s;
matrix[12] = 0.072f + 0.928f * s;
matrix[13] = matrix[14] = 0;
matrix[15] = matrix[16] = matrix[17] = 0;
matrix[18] = 1;
matrix[19] = 0;
}
static void HueRotateMatrix(float hue, float matrix[kColorMatrixSize]) {
float cos_hue = cosf(hue * kPiFloat / 180);
float sin_hue = sinf(hue * kPiFloat / 180);
matrix[0] = 0.213f + cos_hue * 0.787f - sin_hue * 0.213f;
matrix[1] = 0.715f - cos_hue * 0.715f - sin_hue * 0.715f;
matrix[2] = 0.072f - cos_hue * 0.072f + sin_hue * 0.928f;
matrix[3] = matrix[4] = 0;
matrix[5] = 0.213f - cos_hue * 0.213f + sin_hue * 0.143f;
matrix[6] = 0.715f + cos_hue * 0.285f + sin_hue * 0.140f;
matrix[7] = 0.072f - cos_hue * 0.072f - sin_hue * 0.283f;
matrix[8] = matrix[9] = 0;
matrix[10] = 0.213f - cos_hue * 0.213f - sin_hue * 0.787f;
matrix[11] = 0.715f - cos_hue * 0.715f + sin_hue * 0.715f;
matrix[12] = 0.072f + cos_hue * 0.928f + sin_hue * 0.072f;
matrix[13] = matrix[14] = 0;
matrix[15] = matrix[16] = matrix[17] = 0;
matrix[18] = 1;
matrix[19] = 0;
}
static void LuminanceToAlphaMatrix(float matrix[kColorMatrixSize]) {
memset(matrix, 0, kColorMatrixSize * sizeof(float));
matrix[15] = 0.2125f;
matrix[16] = 0.7154f;
matrix[17] = 0.0721f;
}
static sk_sp<SkColorFilter> CreateColorFilter(ColorMatrixType type,
const Vector<float>& values) {
// Use defaults if values contains too few/many values.
float matrix[kColorMatrixSize];
memset(matrix, 0, kColorMatrixSize * sizeof(float));
matrix[0] = matrix[6] = matrix[12] = matrix[18] = 1;
switch (type) {
case FECOLORMATRIX_TYPE_UNKNOWN:
break;
case FECOLORMATRIX_TYPE_MATRIX:
if (values.size() == kColorMatrixSize) {
for (unsigned i = 0; i < kColorMatrixSize; ++i)
matrix[i] = values[i];
}
break;
case FECOLORMATRIX_TYPE_SATURATE:
if (values.size() == 1)
SaturateMatrix(values[0], matrix);
break;
case FECOLORMATRIX_TYPE_HUEROTATE:
if (values.size() == 1)
HueRotateMatrix(values[0], matrix);
break;
case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
LuminanceToAlphaMatrix(matrix);
break;
}
return SkColorFilters::Matrix(matrix);
}
bool FEColorMatrix::AffectsTransparentPixels() const {
// Because the input pixels are premultiplied, the only way clear pixels can
// be painted is if the additive component for the alpha is not 0.
return type_ == FECOLORMATRIX_TYPE_MATRIX &&
values_.size() >= kColorMatrixSize && values_[19] > 0;
}
sk_sp<PaintFilter> FEColorMatrix::CreateImageFilter() {
sk_sp<PaintFilter> input(paint_filter_builder::Build(
InputEffect(0), OperatingInterpolationSpace()));
sk_sp<SkColorFilter> filter = CreateColorFilter(type_, values_);
PaintFilter::CropRect rect = GetCropRect();
return sk_make_sp<ColorFilterPaintFilter>(std::move(filter), std::move(input),
&rect);
}
static WTF::TextStream& operator<<(WTF::TextStream& ts,
const ColorMatrixType& type) {
switch (type) {
case FECOLORMATRIX_TYPE_UNKNOWN:
ts << "UNKNOWN";
break;
case FECOLORMATRIX_TYPE_MATRIX:
ts << "MATRIX";
break;
case FECOLORMATRIX_TYPE_SATURATE:
ts << "SATURATE";
break;
case FECOLORMATRIX_TYPE_HUEROTATE:
ts << "HUEROTATE";
break;
case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
ts << "LUMINANCETOALPHA";
break;
}
return ts;
}
static bool ValuesIsValidForType(ColorMatrixType type,
const Vector<float>& values) {
switch (type) {
case FECOLORMATRIX_TYPE_MATRIX:
return values.size() == kColorMatrixSize;
case FECOLORMATRIX_TYPE_SATURATE:
case FECOLORMATRIX_TYPE_HUEROTATE:
return values.size() == 1;
case FECOLORMATRIX_TYPE_LUMINANCETOALPHA:
return values.size() == 0;
case FECOLORMATRIX_TYPE_UNKNOWN:
break;
}
NOTREACHED();
return false;
}
WTF::TextStream& FEColorMatrix::ExternalRepresentation(WTF::TextStream& ts,
int indent) const {
WriteIndent(ts, indent);
ts << "[feColorMatrix";
FilterEffect::ExternalRepresentation(ts);
ts << " type=\"" << type_ << "\"";
if (!values_.IsEmpty() && ValuesIsValidForType(type_, values_)) {
ts << " values=\"";
Vector<float>::const_iterator ptr = values_.begin();
const Vector<float>::const_iterator end = values_.end();
while (ptr < end) {
ts << *ptr;
++ptr;
if (ptr < end)
ts << " ";
}
ts << "\"";
}
ts << "]\n";
InputEffect(0)->ExternalRepresentation(ts, indent + 1);
return ts;
}
} // namespace blink
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