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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Sk4fGradientBase.h"
namespace {
// true when x is in [k1,k2)
bool in_range(SkScalar x, SkScalar k1, SkScalar k2) {
SkASSERT(k1 != k2);
return (k1 < k2)
? (x >= k1 && x < k2)
: (x >= k2 && x < k1);
}
} // anonymous namespace
SkGradientShaderBase::GradientShaderBase4fContext::
Interval::Interval(SkPMColor c0, SkScalar p0,
SkPMColor c1, SkScalar p1,
const Sk4f& componentScale)
: fP0(p0)
, fP1(p1)
, fZeroRamp(c0 == c1) {
SkASSERT(p0 != p1);
const Sk4f c4f0 = SkPM4f::FromPMColor(c0).to4f() * componentScale;
const Sk4f c4f1 = SkPM4f::FromPMColor(c1).to4f() * componentScale;
const Sk4f dc4f = (c4f1 - c4f0) / (p1 - p0);
c4f0.store(&fC0.fVec);
dc4f.store(&fDc.fVec);
}
bool SkGradientShaderBase::GradientShaderBase4fContext::
Interval::contains(SkScalar fx) const {
return in_range(fx, fP0, fP1);
}
SkGradientShaderBase::
GradientShaderBase4fContext::GradientShaderBase4fContext(const SkGradientShaderBase& shader,
const ContextRec& rec)
: INHERITED(shader, rec)
, fFlags(this->INHERITED::getFlags())
#ifdef SK_SUPPORT_LEGACY_GRADIENT_DITHERING
, fDither(true)
#else
, fDither(rec.fPaint->isDither())
#endif
{
const SkMatrix& inverse = this->getTotalInverse();
fDstToPos.setConcat(shader.fPtsToUnit, inverse);
fDstToPosProc = fDstToPos.getMapXYProc();
fDstToPosClass = static_cast<uint8_t>(INHERITED::ComputeMatrixClass(fDstToPos));
if (shader.fColorsAreOpaque && this->getPaintAlpha() == SK_AlphaOPAQUE) {
fFlags |= kOpaqueAlpha_Flag;
}
fColorsArePremul =
(shader.fGradFlags & SkGradientShader::kInterpolateColorsInPremul_Flag)
|| shader.fColorsAreOpaque;
}
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