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Fix concentric 2pt conical gradient in GPU where r1 < r0

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Bug: skia:7683
Change-Id: I6608e72fa695c855af6a6a447885c4889b09fc1d
Reviewed-on: https://skia-review.googlesource.com/115042
Commit-Queue: Yuqian Li <liyuqian@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
This commit is contained in:
Yuqian Li 2018-03-19 14:23:48 -04:00 committed by Skia Commit-Bot
parent cb88470d82
commit 650dd901e1
2 changed files with 26 additions and 10 deletions
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16
gm/gradients_2pt_conical.cpp
View File

@ -98,17 +98,26 @@ static sk_sp<SkShader> Make2ConicalInsideFlip(const SkPoint pts[2], const GradDa
static sk_sp<SkShader> Make2ConicalInsideCenter(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
SkPoint center0, center1;
SkPoint center0;
center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
return SkGradientShader::MakeTwoPointConical(center0, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm,
0, &localMatrix);
}
static sk_sp<SkShader> Make2ConicalInsideCenterReversed(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
SkPoint center0;
center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::MakeTwoPointConical(center0, (pts[1].fX - pts[0].fX) / 2,
center0, (pts[1].fX - pts[0].fX) / 7,
data.fColors, data.fPos, data.fCount, tm,
0, &localMatrix);
}
static sk_sp<SkShader> Make2ConicalZeroRad(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, const SkMatrix& localMatrix) {
SkPoint center0, center1;
@ -270,6 +279,7 @@ constexpr GradMaker gGradMakersOutside[] = {
constexpr GradMaker gGradMakersInside[] = {
Make2ConicalInside, Make2ConicalInsideFlip, Make2ConicalInsideCenter,
Make2ConicalZeroRad, Make2ConicalZeroRadFlip, Make2ConicalZeroRadCenter,
Make2ConicalInsideCenterReversed
};
constexpr GradMaker gGradMakersEdgeCases[] = {

20
src/shaders/gradients/SkTwoPointConicalGradient_gpu.cpp
View File

@ -92,7 +92,9 @@ public:
bool isNativelyFocal() const { return this->isFocal() && fData.fFocalData.isNativelyFocal(); }
// Note that focalX = f = r0 / (r0 - r1), so 1 - focalX > 0 == r0 < r1
bool isRadiusIncreasing() const { return this->isFocal() && 1 - fData.fFocalData.fFocalX > 0; }
bool isRadiusIncreasing() const {
return this->isFocal() ? 1 - fData.fFocalData.fFocalX > 0 : this->diffRadius() > 0;
}
protected:
void onGetGLSLProcessorKey(const GrShaderCaps& c, GrProcessorKeyBuilder* b) const override {
@ -237,7 +239,8 @@ protected:
const char* p = coords2D.c_str();
if (effect.getType() == Type::kRadial) {
fragBuilder->codeAppendf("half %s = length(%s) - %s;", tName, p, p0.c_str());
char sign = effect.diffRadius() < 0 ? '-' : '+';
fragBuilder->codeAppendf("half %s = %clength(%s) - %s;", tName, sign, p, p0.c_str());
} else {
// output will default to transparent black (we simply won't write anything
// else to it if invalid, instead of discarding or returning prematurely)
@ -263,8 +266,9 @@ protected:
void onSetData(const GrGLSLProgramDataManager& pdman, const GrFragmentProcessor& p) override {
INHERITED::onSetData(pdman, p);
const TwoPointConicalEffect& effect = p.cast<TwoPointConicalEffect>();
// kRadialType should imply r1 - r0 = 1 (after our transformation) so r0 = r0 / (r1 - r0)
SkASSERT(effect.getType() == Type::kStrip || SkScalarNearlyZero(effect.diffRadius() - 1));
// kRadialType should imply |r1 - r0| = 1 (after our transformation)
SkASSERT(effect.getType() == Type::kStrip ||
SkScalarNearlyZero(SkTAbs(effect.diffRadius()) - 1));
pdman.set1f(fParamUni, effect.getType() == Type::kRadial ? effect.r0()
: effect.r0() * effect.r0());
}
@ -407,12 +411,14 @@ std::unique_ptr<GrFragmentProcessor> Gr2PtConicalGradientEffect::Make(
TwoPointConicalEffect::Data::Data(const SkTwoPointConicalGradient& shader, SkMatrix& matrix) {
fType = shader.getType();
if (fType == Type::kRadial) {
SkScalar dr = shader.getDiffRadius();
// Map center to (0, 0) and scale dr to 1
// Map center to (0, 0)
matrix.postTranslate(-shader.getStartCenter().fX, -shader.getStartCenter().fY);
// scale |fDiffRadius| to 1
SkScalar dr = shader.getDiffRadius();
matrix.postScale(1 / dr, 1 / dr);
fRadius0 = shader.getStartRadius() / dr;
fDiffRadius = 1;
fDiffRadius = dr < 0 ? -1 : 1;
} else if (fType == Type::kStrip) {
fRadius0 = shader.getStartRadius() / shader.getCenterX1();
fDiffRadius = 0;