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      1 /*
      2  * Copyright 2012 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef GrAARectRenderer_DEFINED
      9 #define GrAARectRenderer_DEFINED
     10 
     11 #include "SkMatrix.h"
     12 #include "SkRect.h"
     13 #include "SkRefCnt.h"
     14 #include "SkStrokeRec.h"
     15 
     16 class GrGpu;
     17 class GrDrawTarget;
     18 class GrIndexBuffer;
     19 
     20 /*
     21  * This class wraps helper functions that draw AA rects (filled & stroked)
     22  */
     23 class GrAARectRenderer : public SkRefCnt {
     24 public:
     25     SK_DECLARE_INST_COUNT(GrAARectRenderer)
     26 
     27     GrAARectRenderer()
     28     : fAAFillRectIndexBuffer(NULL)
     29     , fAAMiterStrokeRectIndexBuffer(NULL)
     30     , fAABevelStrokeRectIndexBuffer(NULL) {
     31     }
     32 
     33     void reset();
     34 
     35     ~GrAARectRenderer() {
     36         this->reset();
     37     }
     38 
     39     // TODO: potentialy fuse the fill & stroke methods and differentiate
     40     // between them by passing in stroke (==NULL means fill).
     41 
     42     void fillAARect(GrGpu* gpu,
     43                     GrDrawTarget* target,
     44                     const SkRect& rect,
     45                     const SkMatrix& combinedMatrix,
     46                     const SkRect& devRect) {
     47 #ifdef SHADER_AA_FILL_RECT
     48         if (combinedMatrix.rectStaysRect()) {
     49             this->shaderFillAlignedAARect(gpu, target,
     50                                           rect, combinedMatrix);
     51         } else {
     52             this->shaderFillAARect(gpu, target,
     53                                    rect, combinedMatrix);
     54         }
     55 #else
     56         this->geometryFillAARect(gpu, target, rect, combinedMatrix, devRect);
     57 #endif
     58     }
     59 
     60     void strokeAARect(GrGpu* gpu,
     61                       GrDrawTarget* target,
     62                       const SkRect& rect,
     63                       const SkMatrix& combinedMatrix,
     64                       const SkRect& devRect,
     65                       const SkStrokeRec& stroke);
     66 
     67     // First rect is outer; second rect is inner
     68     void fillAANestedRects(GrGpu* gpu,
     69                            GrDrawTarget* target,
     70                            const SkRect rects[2],
     71                            const SkMatrix& combinedMatrix);
     72 
     73 private:
     74     GrIndexBuffer*              fAAFillRectIndexBuffer;
     75     GrIndexBuffer*              fAAMiterStrokeRectIndexBuffer;
     76     GrIndexBuffer*              fAABevelStrokeRectIndexBuffer;
     77 
     78     GrIndexBuffer* aaFillRectIndexBuffer(GrGpu* gpu);
     79 
     80     static int aaStrokeRectIndexCount(bool miterStroke);
     81     GrIndexBuffer* aaStrokeRectIndexBuffer(GrGpu* gpu, bool miterStroke);
     82 
     83     void geometryFillAARect(GrGpu* gpu,
     84                             GrDrawTarget* target,
     85                             const SkRect& rect,
     86                             const SkMatrix& combinedMatrix,
     87                             const SkRect& devRect);
     88 
     89     void shaderFillAARect(GrGpu* gpu,
     90                           GrDrawTarget* target,
     91                           const SkRect& rect,
     92                           const SkMatrix& combinedMatrix);
     93 
     94     void shaderFillAlignedAARect(GrGpu* gpu,
     95                                  GrDrawTarget* target,
     96                                  const SkRect& rect,
     97                                  const SkMatrix& combinedMatrix);
     98 
     99     void geometryStrokeAARect(GrGpu* gpu,
    100                               GrDrawTarget* target,
    101                               const SkRect& devOutside,
    102                               const SkRect& devOutsideAssist,
    103                               const SkRect& devInside,
    104                               bool miterStroke);
    105 
    106     typedef SkRefCnt INHERITED;
    107 };
    108 
    109 #endif // GrAARectRenderer_DEFINED
    110