| |
| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkTwoPointConicalGradient_DEFINED |
| #define SkTwoPointConicalGradient_DEFINED |
| |
| #include "SkGradientShaderPriv.h" |
| |
| struct TwoPtRadial { |
| enum { |
| kDontDrawT = 0x80000000 |
| }; |
| |
| float fCenterX, fCenterY; |
| float fDCenterX, fDCenterY; |
| float fRadius; |
| float fDRadius; |
| float fA; |
| float fRadius2; |
| float fRDR; |
| |
| void init(const SkPoint& center0, SkScalar rad0, |
| const SkPoint& center1, SkScalar rad1); |
| |
| // used by setup and nextT |
| float fRelX, fRelY, fIncX, fIncY; |
| float fB, fDB; |
| |
| void setup(SkScalar fx, SkScalar fy, SkScalar dfx, SkScalar dfy); |
| SkFixed nextT(); |
| |
| static bool DontDrawT(SkFixed t) { |
| return kDontDrawT == (uint32_t)t; |
| } |
| }; |
| |
| |
| class SkTwoPointConicalGradient : public SkGradientShaderBase { |
| TwoPtRadial fRec; |
| void init(); |
| |
| public: |
| SkTwoPointConicalGradient(const SkPoint& start, SkScalar startRadius, |
| const SkPoint& end, SkScalar endRadius, |
| const SkColor colors[], const SkScalar pos[], |
| int colorCount, SkShader::TileMode mode, |
| SkUnitMapper* mapper); |
| |
| virtual void shadeSpan(int x, int y, SkPMColor* dstCParam, |
| int count) SK_OVERRIDE; |
| virtual bool setContext(const SkBitmap& device, |
| const SkPaint& paint, |
| const SkMatrix& matrix) SK_OVERRIDE; |
| |
| virtual BitmapType asABitmap(SkBitmap* bitmap, |
| SkMatrix* matrix, |
| TileMode* xy) const; |
| virtual SkShader::GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE; |
| virtual GrCustomStage* asNewCustomStage(GrContext* context, |
| GrSamplerState* sampler) const SK_OVERRIDE; |
| |
| SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); } |
| SkScalar getStartRadius() const { return fRadius1; } |
| SkScalar getDiffRadius() const { return fRadius2 - fRadius1; } |
| |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient) |
| |
| protected: |
| SkTwoPointConicalGradient(SkFlattenableReadBuffer& buffer); |
| virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE; |
| |
| private: |
| typedef SkGradientShaderBase INHERITED; |
| const SkPoint fCenter1; |
| const SkPoint fCenter2; |
| const SkScalar fRadius1; |
| const SkScalar fRadius2; |
| }; |
| |
| #endif |
| |