src/effects/gradients/SkTwoPointRadialGradient.h

   1
   2 /*
   3  * Copyright 2012 Google Inc.
   4  *
   5  * Use of this source code is governed by a BSD-style license that can be
   6  * found in the LICENSE file.
   7  */
   8
   9  #ifndef SkTwoPointRadialGradient_DEFINED
  10  #define SkTwoPointRadialGradient_DEFINED
  11
  12  #include "SkGradientShaderPriv.h"
  13
  14 class SkTwoPointRadialGradient : public SkGradientShaderBase {
  15 public:
  16     SkTwoPointRadialGradient(const SkPoint& start, SkScalar startRadius,
  17                              const SkPoint& end, SkScalar endRadius,
  18                              const Descriptor&);
  19
  20     virtual BitmapType asABitmap(SkBitmap* bitmap,
  21                                  SkMatrix* matrix,
  22                                  TileMode* xy) const SK_OVERRIDE;
  23     GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE;
  24     virtual bool asFragmentProcessor(GrContext* context, const SkPaint&, const SkMatrix& viewM,
  25                                      const SkMatrix*, GrColor*,
  26                                      GrFragmentProcessor**)  const SK_OVERRIDE;
  27
  28     size_t contextSize() const SK_OVERRIDE;
  29
  30     class TwoPointRadialGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
  31     public:
  32         TwoPointRadialGradientContext(const SkTwoPointRadialGradient&, const ContextRec&);
  33
  34         void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
  35
  36     private:
  37         typedef SkGradientShaderBase::GradientShaderBaseContext INHERITED;
  38     };
  39
  40     SkScalar getCenterX1() const { return fDiff.length(); }
  41     SkScalar getStartRadius() const { return fStartRadius; }
  42     SkScalar getDiffRadius() const { return fDiffRadius; }
  43
  44     SK_TO_STRING_OVERRIDE()
  45     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointRadialGradient)
  46
  47 protected:
  48     SkTwoPointRadialGradient(SkReadBuffer& buffer);
  49     void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE;
  50     Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE;
  51
  52 private:
  53     const SkPoint fCenter1;
  54     const SkPoint fCenter2;
  55     const SkScalar fRadius1;
  56     const SkScalar fRadius2;
  57     SkPoint fDiff;
  58     SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA;
  59
  60     friend class SkGradientShader;
  61     typedef SkGradientShaderBase INHERITED;
  62 };
  63
  64 #endif