src/third_party/skia/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     virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE;
  24     virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint&) const SK_OVERRIDE;
  25
  26     virtual void shadeSpan(int x, int y, SkPMColor* dstCParam,
  27                            int count) SK_OVERRIDE;
  28     virtual bool setContext(const SkBitmap& device,
  29                             const SkPaint& paint,
  30                             const SkMatrix& matrix) SK_OVERRIDE;
  31
  32     SkScalar getCenterX1() const { return fDiff.length(); }
  33     SkScalar getStartRadius() const { return fStartRadius; }
  34     SkScalar getDiffRadius() const { return fDiffRadius; }
  35
  36     SK_DEVELOPER_TO_STRING()
  37     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointRadialGradient)
  38
  39 protected:
  40     SkTwoPointRadialGradient(SkReadBuffer& buffer);
  41     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE;
  42
  43 private:
  44     typedef SkGradientShaderBase INHERITED;
  45     const SkPoint fCenter1;
  46     const SkPoint fCenter2;
  47     const SkScalar fRadius1;
  48     const SkScalar fRadius2;
  49     SkPoint fDiff;
  50     SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA;
  51
  52     void init();
  53 };
  54
  55 #endif