Add flipped gradient branch to two point conical gradient
BUG=skia:
Committed: http://code.google.com/p/skia/source/detail?r=14235
R=bsalomon@google.com
Author: egdaniel@google.com
Review URL: https://codereview.chromium.org/227623004
git-svn-id: http://skia.googlecode.com/svn/trunk@14271 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
index d7b0384..7cdb62d 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
@@ -56,6 +56,7 @@
// The radial gradient parameters can collapse to a linear (instead of quadratic) equation.
bool isDegenerate() const { return SkScalarAbs(fDiffRadius) == SkScalarAbs(fCenterX1); }
+ bool isFlipped() const { return fIsFlipped; }
SkScalar center() const { return fCenterX1; }
SkScalar diffRadius() const { return fDiffRadius; }
SkScalar radius() const { return fRadius0; }
@@ -68,7 +69,8 @@
return (INHERITED::onIsEqual(sBase) &&
this->fCenterX1 == s.fCenterX1 &&
this->fRadius0 == s.fRadius0 &&
- this->fDiffRadius == s.fDiffRadius);
+ this->fDiffRadius == s.fDiffRadius &&
+ this->fIsFlipped == s.fIsFlipped);
}
Default2PtConicalEffect(GrContext* ctx,
@@ -78,7 +80,8 @@
: INHERITED(ctx, shader, matrix, tm),
fCenterX1(shader.getCenterX1()),
fRadius0(shader.getStartRadius()),
- fDiffRadius(shader.getDiffRadius()) {
+ fDiffRadius(shader.getDiffRadius()),
+ fIsFlipped(shader.isFlippedGrad()) {
// We pass the linear part of the quadratic as a varying.
// float b = -2.0 * (fCenterX1 * x + fRadius0 * fDiffRadius * z)
fBTransform = this->getCoordTransform();
@@ -103,6 +106,7 @@
SkScalar fCenterX1;
SkScalar fRadius0;
SkScalar fDiffRadius;
+ bool fIsFlipped;
// @}
@@ -132,6 +136,7 @@
const char* fFSVaryingName;
bool fIsDegenerate;
+ bool fIsFlipped;
// @{
/// Values last uploaded as uniforms
@@ -194,6 +199,7 @@
const Default2PtConicalEffect& data = drawEffect.castEffect<Default2PtConicalEffect>();
fIsDegenerate = data.isDegenerate();
+ fIsFlipped = data.isFlipped();
}
void GLDefault2PtConicalEffect::emitCode(GrGLShaderBuilder* builder,
@@ -281,9 +287,14 @@
// Note: If there are two roots that both generate radius(t) > 0, the
// Canvas spec says to choose the larger t.
- // so we'll look at the larger one first:
- builder->fsCodeAppendf("\t\tfloat %s = max(%s, %s);\n", tName.c_str(),
- r0Name.c_str(), r1Name.c_str());
+ // so we'll look at the larger one first (or smaller if flipped):
+ if (!fIsFlipped) {
+ builder->fsCodeAppendf("\t\tfloat %s = max(%s, %s);\n", tName.c_str(),
+ r0Name.c_str(), r1Name.c_str());
+ } else {
+ builder->fsCodeAppendf("\t\tfloat %s = min(%s, %s);\n", tName.c_str(),
+ r0Name.c_str(), r1Name.c_str());
+ }
// if r(t) > 0, then we're done; t will be our x coordinate
builder->fsCodeAppendf("\t\tif (%s * %s + %s > 0.0) {\n", tName.c_str(),
@@ -294,8 +305,13 @@
// otherwise, if r(t) for the larger root was <= 0, try the other root
builder->fsCodeAppend("\t\t} else {\n");
- builder->fsCodeAppendf("\t\t\t%s = min(%s, %s);\n", tName.c_str(),
- r0Name.c_str(), r1Name.c_str());
+ if (!fIsFlipped) {
+ builder->fsCodeAppendf("\t\t\t%s = min(%s, %s);\n", tName.c_str(),
+ r0Name.c_str(), r1Name.c_str());
+ } else {
+ builder->fsCodeAppendf("\t\t\t%s = max(%s, %s);\n", tName.c_str(),
+ r0Name.c_str(), r1Name.c_str());
+ }
// if r(t) > 0 for the smaller root, then t will be our x coordinate
builder->fsCodeAppendf("\t\t\tif (%s * %s + %s > 0.0) {\n",
@@ -330,6 +346,7 @@
INHERITED::setData(uman, drawEffect);
const Default2PtConicalEffect& data = drawEffect.castEffect<Default2PtConicalEffect>();
SkASSERT(data.isDegenerate() == fIsDegenerate);
+ SkASSERT(data.isFlipped() == fIsFlipped);
SkScalar centerX1 = data.center();
SkScalar radius0 = data.radius();
SkScalar diffRadius = data.diffRadius();
@@ -365,12 +382,16 @@
const GrGLCaps&) {
enum {
kIsDegenerate = 1 << kBaseKeyBitCnt,
+ kIsFlipped = 1 << (kBaseKeyBitCnt + 1),
};
EffectKey key = GenBaseGradientKey(drawEffect);
if (drawEffect.castEffect<Default2PtConicalEffect>().isDegenerate()) {
key |= kIsDegenerate;
}
+ if (drawEffect.castEffect<Default2PtConicalEffect>().isFlipped()) {
+ key |= kIsFlipped;
+ }
return key;
}