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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSGGradient.h"
#include "SkGradientShader.h"
#include "SkPaint.h"
namespace sksg {
void Gradient::onApplyToPaint(SkPaint* paint) const {
if (fColorStops.empty()) {
paint->setShader(nullptr);
return;
}
std::vector<SkColor> colors;
std::vector<SkScalar> positions;
colors.reserve(fColorStops.size());
positions.reserve(fColorStops.size());
SkScalar position = 0;
for (const auto& stop : fColorStops) {
colors.push_back(stop.fColor);
position = SkTPin(stop.fPosition, position, 1.0f);
positions.push_back(position);
}
// TODO: detect even stop distributions, pass null for positions.
paint->setShader(this->onMakeShader(colors, positions));
}
sk_sp<SkShader> LinearGradient::onMakeShader(const std::vector<SkColor>& colors,
const std::vector<SkScalar>& positions) const {
SkASSERT(colors.size() == positions.size());
const SkPoint pts[] = { fStartPoint, fEndPoint };
return SkGradientShader::MakeLinear(pts, colors.data(), positions.data(), colors.size(),
this->getTileMode());
}
sk_sp<SkShader> RadialGradient::onMakeShader(const std::vector<SkColor>& colors,
const std::vector<SkScalar>& positions) const {
SkASSERT(colors.size() == positions.size());
return (fStartRadius <= 0 && fStartCenter == fEndCenter)
? SkGradientShader::MakeRadial(fEndCenter, fEndRadius,
colors.data(), positions.data(), colors.size(),
this->getTileMode())
: SkGradientShader::MakeTwoPointConical(fStartCenter, fStartRadius,
fEndCenter, fEndRadius,
colors.data(), positions.data(), colors.size(),
this->getTileMode());
}
} //namespace sksg
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