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Unified Diff: src/effects/gradients/SkTwoPointRadialGradient.cpp

Issue 1117423003: remove redundant/deprecated TwoPointRadial gradiet -- use TwoPointConical (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 8 months ago
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Index: src/effects/gradients/SkTwoPointRadialGradient.cpp
diff --git a/src/effects/gradients/SkTwoPointRadialGradient.cpp b/src/effects/gradients/SkTwoPointRadialGradient.cpp
deleted file mode 100644
index 44b73d6a3e256a78d77c4be7a26c0c41f24e8429..0000000000000000000000000000000000000000
--- a/src/effects/gradients/SkTwoPointRadialGradient.cpp
+++ /dev/null
@@ -1,724 +0,0 @@
-
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkTwoPointRadialGradient.h"
-
-/* Two-point radial gradients are specified by two circles, each with a center
- point and radius. The gradient can be considered to be a series of
- concentric circles, with the color interpolated from the start circle
- (at t=0) to the end circle (at t=1).
-
- For each point (x, y) in the span, we want to find the
- interpolated circle that intersects that point. The center
- of the desired circle (Cx, Cy) falls at some distance t
- along the line segment between the start point (Sx, Sy) and
- end point (Ex, Ey):
-
- Cx = (1 - t) * Sx + t * Ex (0 <= t <= 1)
- Cy = (1 - t) * Sy + t * Ey
-
- The radius of the desired circle (r) is also a linear interpolation t
- between the start and end radii (Sr and Er):
-
- r = (1 - t) * Sr + t * Er
-
- But
-
- (x - Cx)^2 + (y - Cy)^2 = r^2
-
- so
-
- (x - ((1 - t) * Sx + t * Ex))^2
- + (y - ((1 - t) * Sy + t * Ey))^2
- = ((1 - t) * Sr + t * Er)^2
-
- Solving for t yields
-
- [(Sx - Ex)^2 + (Sy - Ey)^2 - (Er - Sr)^2)] * t^2
- + [2 * (Sx - Ex)(x - Sx) + 2 * (Sy - Ey)(y - Sy) - 2 * (Er - Sr) * Sr] * t
- + [(x - Sx)^2 + (y - Sy)^2 - Sr^2] = 0
-
- To simplify, let Dx = Sx - Ex, Dy = Sy - Ey, Dr = Er - Sr, dx = x - Sx, dy = y - Sy
-
- [Dx^2 + Dy^2 - Dr^2)] * t^2
- + 2 * [Dx * dx + Dy * dy - Dr * Sr] * t
- + [dx^2 + dy^2 - Sr^2] = 0
-
- A quadratic in t. The two roots of the quadratic reflect the two
- possible circles on which the point may fall. Solving for t yields
- the gradient value to use.
-
- If a<0, the start circle is entirely contained in the
- end circle, and one of the roots will be <0 or >1 (off the line
- segment). If a>0, the start circle falls at least partially
- outside the end circle (or vice versa), and the gradient
- defines a "tube" where a point may be on one circle (on the
- inside of the tube) or the other (outside of the tube). We choose
- one arbitrarily.
-
- In order to keep the math to within the limits of fixed point,
- we divide the entire quadratic by Dr^2, and replace
- (x - Sx)/Dr with x' and (y - Sy)/Dr with y', giving
-
- [Dx^2 / Dr^2 + Dy^2 / Dr^2 - 1)] * t^2
- + 2 * [x' * Dx / Dr + y' * Dy / Dr - Sr / Dr] * t
- + [x'^2 + y'^2 - Sr^2/Dr^2] = 0
-
- (x' and y' are computed by appending the subtract and scale to the
- fDstToIndex matrix in the constructor).
-
- Since the 'A' component of the quadratic is independent of x' and y', it
- is precomputed in the constructor. Since the 'B' component is linear in
- x' and y', if x and y are linear in the span, 'B' can be computed
- incrementally with a simple delta (db below). If it is not (e.g.,
- a perspective projection), it must be computed in the loop.
-
-*/
-
-namespace {
-
-inline SkFixed two_point_radial(SkScalar b, SkScalar fx, SkScalar fy,
- SkScalar sr2d2, SkScalar foura,
- SkScalar oneOverTwoA, bool posRoot) {
- SkScalar c = SkScalarSquare(fx) + SkScalarSquare(fy) - sr2d2;
- if (0 == foura) {
- return SkScalarToFixed(SkScalarDiv(-c, b));
- }
-
- SkScalar discrim = SkScalarSquare(b) - SkScalarMul(foura, c);
- if (discrim < 0) {
- discrim = -discrim;
- }
- SkScalar rootDiscrim = SkScalarSqrt(discrim);
- SkScalar result;
- if (posRoot) {
- result = SkScalarMul(-b + rootDiscrim, oneOverTwoA);
- } else {
- result = SkScalarMul(-b - rootDiscrim, oneOverTwoA);
- }
- return SkScalarToFixed(result);
-}
-
-typedef void (* TwoPointRadialShadeProc)(SkScalar fx, SkScalar dx,
- SkScalar fy, SkScalar dy,
- SkScalar b, SkScalar db,
- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
- SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
- int count);
-
-void shadeSpan_twopoint_clamp(SkScalar fx, SkScalar dx,
- SkScalar fy, SkScalar dy,
- SkScalar b, SkScalar db,
- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
- SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
- int count) {
- for (; count > 0; --count) {
- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura,
- fOneOverTwoA, posRoot);
- SkFixed index = SkClampMax(t, 0xFFFF);
- SkASSERT(index <= 0xFFFF);
- *dstC++ = cache[index >> SkGradientShaderBase::kCache32Shift];
- fx += dx;
- fy += dy;
- b += db;
- }
-}
-void shadeSpan_twopoint_mirror(SkScalar fx, SkScalar dx,
- SkScalar fy, SkScalar dy,
- SkScalar b, SkScalar db,
- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
- SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
- int count) {
- for (; count > 0; --count) {
- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura,
- fOneOverTwoA, posRoot);
- SkFixed index = mirror_tileproc(t);
- SkASSERT(index <= 0xFFFF);
- *dstC++ = cache[index >> SkGradientShaderBase::kCache32Shift];
- fx += dx;
- fy += dy;
- b += db;
- }
-}
-
-void shadeSpan_twopoint_repeat(SkScalar fx, SkScalar dx,
- SkScalar fy, SkScalar dy,
- SkScalar b, SkScalar db,
- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot,
- SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache,
- int count) {
- for (; count > 0; --count) {
- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura,
- fOneOverTwoA, posRoot);
- SkFixed index = repeat_tileproc(t);
- SkASSERT(index <= 0xFFFF);
- *dstC++ = cache[index >> SkGradientShaderBase::kCache32Shift];
- fx += dx;
- fy += dy;
- b += db;
- }
-}
-}
-
-/////////////////////////////////////////////////////////////////////
-
-static SkMatrix pts_to_unit(const SkPoint& start, SkScalar diffRadius) {
- SkScalar inv = diffRadius ? SkScalarInvert(diffRadius) : 0;
- SkMatrix matrix;
- matrix.setTranslate(-start.fX, -start.fY);
- matrix.postScale(inv, inv);
- return matrix;
-}
-
-SkTwoPointRadialGradient::SkTwoPointRadialGradient(const SkPoint& start, SkScalar startRadius,
- const SkPoint& end, SkScalar endRadius,
- const Descriptor& desc)
- : SkGradientShaderBase(desc, pts_to_unit(start, endRadius - startRadius))
- , fCenter1(start)
- , fCenter2(end)
- , fRadius1(startRadius)
- , fRadius2(endRadius)
-{
- fDiff = fCenter1 - fCenter2;
- fDiffRadius = fRadius2 - fRadius1;
- // hack to avoid zero-divide for now
- SkScalar inv = fDiffRadius ? SkScalarInvert(fDiffRadius) : 0;
- fDiff.fX = SkScalarMul(fDiff.fX, inv);
- fDiff.fY = SkScalarMul(fDiff.fY, inv);
- fStartRadius = SkScalarMul(fRadius1, inv);
- fSr2D2 = SkScalarSquare(fStartRadius);
- fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SK_Scalar1;
- fOneOverTwoA = fA ? SkScalarInvert(fA * 2) : 0;
-}
-
-SkShader::BitmapType SkTwoPointRadialGradient::asABitmap(
- SkBitmap* bitmap,
- SkMatrix* matrix,
- SkShader::TileMode* xy) const {
- if (bitmap) {
- this->getGradientTableBitmap(bitmap);
- }
- SkScalar diffL = 0; // just to avoid gcc warning
- if (matrix) {
- diffL = SkScalarSqrt(SkScalarSquare(fDiff.fX) +
- SkScalarSquare(fDiff.fY));
- }
- if (matrix) {
- if (diffL) {
- SkScalar invDiffL = SkScalarInvert(diffL);
- matrix->setSinCos(-SkScalarMul(invDiffL, fDiff.fY),
- SkScalarMul(invDiffL, fDiff.fX));
- } else {
- matrix->reset();
- }
- matrix->preConcat(fPtsToUnit);
- }
- if (xy) {
- xy[0] = fTileMode;
- xy[1] = kClamp_TileMode;
- }
- return kTwoPointRadial_BitmapType;
-}
-
-SkShader::GradientType SkTwoPointRadialGradient::asAGradient(
- SkShader::GradientInfo* info) const {
- if (info) {
- commonAsAGradient(info);
- info->fPoint[0] = fCenter1;
- info->fPoint[1] = fCenter2;
- info->fRadius[0] = fRadius1;
- info->fRadius[1] = fRadius2;
- }
- return kRadial2_GradientType;
-}
-
-size_t SkTwoPointRadialGradient::contextSize() const {
- return sizeof(TwoPointRadialGradientContext);
-}
-
-SkShader::Context* SkTwoPointRadialGradient::onCreateContext(const ContextRec& rec,
- void* storage) const {
- // For now, we might have divided by zero, so detect that.
- if (0 == fDiffRadius) {
- return NULL;
- }
- return SkNEW_PLACEMENT_ARGS(storage, TwoPointRadialGradientContext, (*this, rec));
-}
-
-SkTwoPointRadialGradient::TwoPointRadialGradientContext::TwoPointRadialGradientContext(
- const SkTwoPointRadialGradient& shader, const ContextRec& rec)
- : INHERITED(shader, rec)
-{
- // we don't have a span16 proc
- fFlags &= ~kHasSpan16_Flag;
-}
-
-void SkTwoPointRadialGradient::TwoPointRadialGradientContext::shadeSpan(
- int x, int y, SkPMColor* dstCParam, int count) {
- SkASSERT(count > 0);
-
- const SkTwoPointRadialGradient& twoPointRadialGradient =
- static_cast<const SkTwoPointRadialGradient&>(fShader);
-
- SkPMColor* SK_RESTRICT dstC = dstCParam;
-
- // Zero difference between radii: fill with transparent black.
- if (twoPointRadialGradient.fDiffRadius == 0) {
- sk_bzero(dstC, count * sizeof(*dstC));
- return;
- }
- SkMatrix::MapXYProc dstProc = fDstToIndexProc;
- TileProc proc = twoPointRadialGradient.fTileProc;
- const SkPMColor* SK_RESTRICT cache = fCache->getCache32();
-
- SkScalar foura = twoPointRadialGradient.fA * 4;
- bool posRoot = twoPointRadialGradient.fDiffRadius < 0;
- if (fDstToIndexClass != kPerspective_MatrixClass) {
- SkPoint srcPt;
- dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf,
- SkIntToScalar(y) + SK_ScalarHalf, &srcPt);
- SkScalar dx, fx = srcPt.fX;
- SkScalar dy, fy = srcPt.fY;
-
- if (fDstToIndexClass == kFixedStepInX_MatrixClass) {
- SkFixed fixedX, fixedY;
- (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &fixedX, &fixedY);
- dx = SkFixedToScalar(fixedX);
- dy = SkFixedToScalar(fixedY);
- } else {
- SkASSERT(fDstToIndexClass == kLinear_MatrixClass);
- dx = fDstToIndex.getScaleX();
- dy = fDstToIndex.getSkewY();
- }
- SkScalar b = (SkScalarMul(twoPointRadialGradient.fDiff.fX, fx) +
- SkScalarMul(twoPointRadialGradient.fDiff.fY, fy) -
- twoPointRadialGradient.fStartRadius) * 2;
- SkScalar db = (SkScalarMul(twoPointRadialGradient.fDiff.fX, dx) +
- SkScalarMul(twoPointRadialGradient.fDiff.fY, dy)) * 2;
-
- TwoPointRadialShadeProc shadeProc = shadeSpan_twopoint_repeat;
- if (SkShader::kClamp_TileMode == twoPointRadialGradient.fTileMode) {
- shadeProc = shadeSpan_twopoint_clamp;
- } else if (SkShader::kMirror_TileMode == twoPointRadialGradient.fTileMode) {
- shadeProc = shadeSpan_twopoint_mirror;
- } else {
- SkASSERT(SkShader::kRepeat_TileMode == twoPointRadialGradient.fTileMode);
- }
- (*shadeProc)(fx, dx, fy, dy, b, db,
- twoPointRadialGradient.fSr2D2, foura,
- twoPointRadialGradient.fOneOverTwoA, posRoot,
- dstC, cache, count);
- } else { // perspective case
- SkScalar dstX = SkIntToScalar(x);
- SkScalar dstY = SkIntToScalar(y);
- for (; count > 0; --count) {
- SkPoint srcPt;
- dstProc(fDstToIndex, dstX, dstY, &srcPt);
- SkScalar fx = srcPt.fX;
- SkScalar fy = srcPt.fY;
- SkScalar b = (SkScalarMul(twoPointRadialGradient.fDiff.fX, fx) +
- SkScalarMul(twoPointRadialGradient.fDiff.fY, fy) -
- twoPointRadialGradient.fStartRadius) * 2;
- SkFixed t = two_point_radial(b, fx, fy, twoPointRadialGradient.fSr2D2, foura,
- twoPointRadialGradient.fOneOverTwoA, posRoot);
- SkFixed index = proc(t);
- SkASSERT(index <= 0xFFFF);
- *dstC++ = cache[index >> SkGradientShaderBase::kCache32Shift];
- dstX += SK_Scalar1;
- }
- }
-}
-
-#ifndef SK_IGNORE_TO_STRING
-void SkTwoPointRadialGradient::toString(SkString* str) const {
- str->append("SkTwoPointRadialGradient: (");
-
- str->append("center1: (");
- str->appendScalar(fCenter1.fX);
- str->append(", ");
- str->appendScalar(fCenter1.fY);
- str->append(") radius1: ");
- str->appendScalar(fRadius1);
- str->append(" ");
-
- str->append("center2: (");
- str->appendScalar(fCenter2.fX);
- str->append(", ");
- str->appendScalar(fCenter2.fY);
- str->append(") radius2: ");
- str->appendScalar(fRadius2);
- str->append(" ");
-
- this->INHERITED::toString(str);
-
- str->append(")");
-}
-#endif
-
-SkFlattenable* SkTwoPointRadialGradient::CreateProc(SkReadBuffer& buffer) {
- DescriptorScope desc;
- if (!desc.unflatten(buffer)) {
- return NULL;
- }
- const SkPoint c1 = buffer.readPoint();
- const SkPoint c2 = buffer.readPoint();
- const SkScalar r1 = buffer.readScalar();
- const SkScalar r2 = buffer.readScalar();
- return SkGradientShader::CreateTwoPointRadial(c1, r1, c2, r2, desc.fColors, desc.fPos,
- desc.fCount, desc.fTileMode, desc.fGradFlags,
- desc.fLocalMatrix);
-}
-
-void SkTwoPointRadialGradient::flatten(
- SkWriteBuffer& buffer) const {
- this->INHERITED::flatten(buffer);
- buffer.writePoint(fCenter1);
- buffer.writePoint(fCenter2);
- buffer.writeScalar(fRadius1);
- buffer.writeScalar(fRadius2);
-}
-
-/////////////////////////////////////////////////////////////////////
-
-#if SK_SUPPORT_GPU
-
-#include "SkGr.h"
-#include "gl/builders/GrGLProgramBuilder.h"
-
-// For brevity
-typedef GrGLProgramDataManager::UniformHandle UniformHandle;
-
-class GrGLRadial2Gradient : public GrGLGradientEffect {
-
-public:
-
- GrGLRadial2Gradient(const GrProcessor&);
- virtual ~GrGLRadial2Gradient() { }
-
- virtual void emitCode(GrGLFPBuilder*,
- const GrFragmentProcessor&,
- const char* outputColor,
- const char* inputColor,
- const TransformedCoordsArray&,
- const TextureSamplerArray&) override;
- void setData(const GrGLProgramDataManager&, const GrProcessor&) override;
-
- static void GenKey(const GrProcessor&, const GrGLSLCaps& caps, GrProcessorKeyBuilder* b);
-
-protected:
-
- UniformHandle fParamUni;
-
- const char* fVSVaryingName;
- const char* fFSVaryingName;
-
- bool fIsDegenerate;
-
- // @{
- /// Values last uploaded as uniforms
-
- SkScalar fCachedCenter;
- SkScalar fCachedRadius;
- bool fCachedPosRoot;
-
- // @}
-
-private:
-
- typedef GrGLGradientEffect INHERITED;
-
-};
-
-/////////////////////////////////////////////////////////////////////
-
-class GrRadial2Gradient : public GrGradientEffect {
-public:
- static GrFragmentProcessor* Create(GrContext* ctx,
- const SkTwoPointRadialGradient& shader,
- const SkMatrix& matrix,
- SkShader::TileMode tm) {
- return SkNEW_ARGS(GrRadial2Gradient, (ctx, shader, matrix, tm));
- }
-
- virtual ~GrRadial2Gradient() { }
-
- const char* name() const override { return "Two-Point Radial Gradient"; }
-
- virtual void getGLProcessorKey(const GrGLSLCaps& caps,
- GrProcessorKeyBuilder* b) const override {
- GrGLRadial2Gradient::GenKey(*this, caps, b);
- }
-
- GrGLFragmentProcessor* createGLInstance() const override {
- return SkNEW_ARGS(GrGLRadial2Gradient, (*this));
- }
-
- // The radial gradient parameters can collapse to a linear (instead of quadratic) equation.
- bool isDegenerate() const { return SK_Scalar1 == fCenterX1; }
- SkScalar center() const { return fCenterX1; }
- SkScalar radius() const { return fRadius0; }
- bool isPosRoot() const { return SkToBool(fPosRoot); }
-
-private:
- bool onIsEqual(const GrFragmentProcessor& sBase) const override {
- const GrRadial2Gradient& s = sBase.cast<GrRadial2Gradient>();
- return (INHERITED::onIsEqual(sBase) &&
- this->fCenterX1 == s.fCenterX1 &&
- this->fRadius0 == s.fRadius0 &&
- this->fPosRoot == s.fPosRoot);
- }
-
- GrRadial2Gradient(GrContext* ctx,
- const SkTwoPointRadialGradient& shader,
- const SkMatrix& matrix,
- SkShader::TileMode tm)
- : INHERITED(ctx, shader, matrix, tm)
- , fCenterX1(shader.getCenterX1())
- , fRadius0(shader.getStartRadius())
- , fPosRoot(shader.getDiffRadius() < 0) {
- this->initClassID<GrRadial2Gradient>();
- // We pass the linear part of the quadratic as a varying.
- // float b = 2.0 * (fCenterX1 * x - fRadius0 * z)
- fBTransform = this->getCoordTransform();
- SkMatrix& bMatrix = *fBTransform.accessMatrix();
- bMatrix[SkMatrix::kMScaleX] = 2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMScaleX]) -
- SkScalarMul(fRadius0, bMatrix[SkMatrix::kMPersp0]));
- bMatrix[SkMatrix::kMSkewX] = 2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMSkewX]) -
- SkScalarMul(fRadius0, bMatrix[SkMatrix::kMPersp1]));
- bMatrix[SkMatrix::kMTransX] = 2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMTransX]) -
- SkScalarMul(fRadius0, bMatrix[SkMatrix::kMPersp2]));
- this->addCoordTransform(&fBTransform);
- }
-
- GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
-
- // @{
- // Cache of values - these can change arbitrarily, EXCEPT
- // we shouldn't change between degenerate and non-degenerate?!
-
- GrCoordTransform fBTransform;
- SkScalar fCenterX1;
- SkScalar fRadius0;
- SkBool8 fPosRoot;
-
- // @}
-
- typedef GrGradientEffect INHERITED;
-};
-
-/////////////////////////////////////////////////////////////////////
-
-GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrRadial2Gradient);
-
-GrFragmentProcessor* GrRadial2Gradient::TestCreate(SkRandom* random,
- GrContext* context,
- const GrDrawTargetCaps&,
- GrTexture**) {
- SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()};
- SkScalar radius1 = random->nextUScalar1();
- SkPoint center2;
- SkScalar radius2;
- do {
- center2.set(random->nextUScalar1(), random->nextUScalar1());
- radius2 = random->nextUScalar1 ();
- // There is a bug in two point radial gradients with identical radii
- } while (radius1 == radius2);
-
- SkColor colors[kMaxRandomGradientColors];
- SkScalar stopsArray[kMaxRandomGradientColors];
- SkScalar* stops = stopsArray;
- SkShader::TileMode tm;
- int colorCount = RandomGradientParams(random, colors, &stops, &tm);
- SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointRadial(center1, radius1,
- center2, radius2,
- colors, stops, colorCount,
- tm));
- SkPaint paint;
- GrFragmentProcessor* fp;
- GrColor paintColor;
- SkAssertResult(shader->asFragmentProcessor(context, paint,
- GrTest::TestMatrix(random), NULL,
- &paintColor, &fp));
- return fp;
-}
-
-/////////////////////////////////////////////////////////////////////
-
-GrGLRadial2Gradient::GrGLRadial2Gradient(const GrProcessor& processor)
- : fVSVaryingName(NULL)
- , fFSVaryingName(NULL)
- , fCachedCenter(SK_ScalarMax)
- , fCachedRadius(-SK_ScalarMax)
- , fCachedPosRoot(0) {
-
- const GrRadial2Gradient& data = processor.cast<GrRadial2Gradient>();
- fIsDegenerate = data.isDegenerate();
-}
-
-void GrGLRadial2Gradient::emitCode(GrGLFPBuilder* builder,
- const GrFragmentProcessor& fp,
- const char* outputColor,
- const char* inputColor,
- const TransformedCoordsArray& coords,
- const TextureSamplerArray& samplers) {
- const GrRadial2Gradient& ge = fp.cast<GrRadial2Gradient>();
- this->emitUniforms(builder, ge);
- fParamUni = builder->addUniformArray(GrGLProgramBuilder::kFragment_Visibility,
- kFloat_GrSLType, kDefault_GrSLPrecision,
- "Radial2FSParams", 6);
-
- SkString cName("c");
- SkString ac4Name("ac4");
- SkString rootName("root");
- SkString t;
- SkString p0;
- SkString p1;
- SkString p2;
- SkString p3;
- SkString p4;
- SkString p5;
- builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0);
- builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1);
- builder->getUniformVariable(fParamUni).appendArrayAccess(2, &p2);
- builder->getUniformVariable(fParamUni).appendArrayAccess(3, &p3);
- builder->getUniformVariable(fParamUni).appendArrayAccess(4, &p4);
- builder->getUniformVariable(fParamUni).appendArrayAccess(5, &p5);
-
- GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
- // We interpolate the linear component in coords[1].
- SkASSERT(coords[0].getType() == coords[1].getType());
- const char* coords2D;
- SkString bVar;
- if (kVec3f_GrSLType == coords[0].getType()) {
- fsBuilder->codeAppendf("\tvec3 interpolants = vec3(%s.xy, %s.x) / %s.z;\n",
- coords[0].c_str(), coords[1].c_str(), coords[0].c_str());
- coords2D = "interpolants.xy";
- bVar = "interpolants.z";
- } else {
- coords2D = coords[0].c_str();
- bVar.printf("%s.x", coords[1].c_str());
- }
-
- // c = (x^2)+(y^2) - params[4]
- fsBuilder->codeAppendf("\tfloat %s = dot(%s, %s) - %s;\n",
- cName.c_str(), coords2D, coords2D, p4.c_str());
-
- // If we aren't degenerate, emit some extra code, and accept a slightly
- // more complex coord.
- if (!fIsDegenerate) {
-
- // ac4 = 4.0 * params[0] * c
- fsBuilder->codeAppendf("\tfloat %s = %s * 4.0 * %s;\n",
- ac4Name.c_str(), p0.c_str(),
- cName.c_str());
-
- // root = sqrt(b^2-4ac)
- // (abs to avoid exception due to fp precision)
- fsBuilder->codeAppendf("\tfloat %s = sqrt(abs(%s*%s - %s));\n",
- rootName.c_str(), bVar.c_str(), bVar.c_str(),
- ac4Name.c_str());
-
- // t is: (-b + params[5] * sqrt(b^2-4ac)) * params[1]
- t.printf("(-%s + %s * %s) * %s", bVar.c_str(), p5.c_str(),
- rootName.c_str(), p1.c_str());
- } else {
- // t is: -c/b
- t.printf("-%s / %s", cName.c_str(), bVar.c_str());
- }
-
- this->emitColor(builder, ge, t.c_str(), outputColor, inputColor, samplers);
-}
-
-void GrGLRadial2Gradient::setData(const GrGLProgramDataManager& pdman,
- const GrProcessor& processor) {
- INHERITED::setData(pdman, processor);
- const GrRadial2Gradient& data = processor.cast<GrRadial2Gradient>();
- SkASSERT(data.isDegenerate() == fIsDegenerate);
- SkScalar centerX1 = data.center();
- SkScalar radius0 = data.radius();
- if (fCachedCenter != centerX1 ||
- fCachedRadius != radius0 ||
- fCachedPosRoot != data.isPosRoot()) {
-
- SkScalar a = SkScalarMul(centerX1, centerX1) - SK_Scalar1;
-
- // When we're in the degenerate (linear) case, the second
- // value will be INF but the program doesn't read it. (We
- // use the same 6 uniforms even though we don't need them
- // all in the linear case just to keep the code complexity
- // down).
- float values[6] = {
- SkScalarToFloat(a),
- 1 / (2.f * SkScalarToFloat(a)),
- SkScalarToFloat(centerX1),
- SkScalarToFloat(radius0),
- SkScalarToFloat(SkScalarMul(radius0, radius0)),
- data.isPosRoot() ? 1.f : -1.f
- };
-
- pdman.set1fv(fParamUni, 6, values);
- fCachedCenter = centerX1;
- fCachedRadius = radius0;
- fCachedPosRoot = data.isPosRoot();
- }
-}
-
-void GrGLRadial2Gradient::GenKey(const GrProcessor& processor,
- const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
- uint32_t* key = b->add32n(2);
- key[0] = GenBaseGradientKey(processor);
- key[1] = processor.cast<GrRadial2Gradient>().isDegenerate();
-}
-
-/////////////////////////////////////////////////////////////////////
-
-bool SkTwoPointRadialGradient::asFragmentProcessor(GrContext* context, const SkPaint& paint,
- const SkMatrix&,
- const SkMatrix* localMatrix, GrColor* paintColor,
- GrFragmentProcessor** fp) const {
- SkASSERT(context);
-
- // invert the localM, translate to center1 (fPtsToUni), rotate so center2 is on x axis.
- SkMatrix matrix;
- if (!this->getLocalMatrix().invert(&matrix)) {
- return false;
- }
- if (localMatrix) {
- SkMatrix inv;
- if (!localMatrix->invert(&inv)) {
- return false;
- }
- matrix.postConcat(inv);
- }
- matrix.postConcat(fPtsToUnit);
-
- SkScalar diffLen = fDiff.length();
- if (0 != diffLen) {
- SkScalar invDiffLen = SkScalarInvert(diffLen);
- SkMatrix rot;
- rot.setSinCos(-SkScalarMul(invDiffLen, fDiff.fY),
- SkScalarMul(invDiffLen, fDiff.fX));
- matrix.postConcat(rot);
- }
-
- *paintColor = SkColor2GrColorJustAlpha(paint.getColor());
- *fp = GrRadial2Gradient::Create(context, *this, matrix, fTileMode);
-
- return true;
-}
-
-#else
-
-bool SkTwoPointRadialGradient::asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&,
- const SkMatrix*,
- GrColor*, GrFragmentProcessor**) const {
- SkDEBUGFAIL("Should not call in GPU-less build");
- return false;
-}
-
-#endif
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