WIP: GPU-accelerated trapezoidal path renderer.

src/core/SkEdge.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkEdge_DEFINED
@@ skipping 11 matching lines @@
         kLine_Type,
         kQuad_Type,
         kCubic_Type
     };
 
     SkEdge* fNext;
     SkEdge* fPrev;
 
     SkFixed fX;
     SkFixed fDX;
+    float   fFirstXf;      // only used for trapezoidal renderer
+    float   fFirstYf;      // only used for trapezoidal renderer
     int32_t fFirstY;
     int32_t fLastY;
     int8_t fCurveCount;    // only used by kQuad(+) and kCubic(-)
     uint8_t fCurveShift;    // appled to all Dx/DDx/DDDx except for fCubicDShift exception
     uint8_t fCubicDShift;   // applied to fCDx and fCDy only in cubic
     int8_t  fWinding;       // 1 or -1
 
     int setLine(const SkPoint& p0, const SkPoint& p1, const SkIRect* clip, int shiftUp);
     // call this version if you know you don't have a clip
     inline int setLine(const SkPoint& p0, const SkPoint& p1, int shiftUp);
@@ skipping 73 matching lines @@
 
     // are we a zero-height line?
     if (top == bot) {
         return 0;
     }
 
     SkFixed slope = SkFDot6Div(x1 - x0, y1 - y0);
     const SkFDot6 dy  = SkEdge_Compute_DY(top, y0);
 
     fX          = SkFDot6ToFixed(x0 + SkFixedMul(slope, dy));   // + SK_Fixed1/2
+    fFirstXf    = winding < 0 ? p1.fX : p0.fX;
     fDX         = slope;
     fFirstY     = top;
+    fFirstYf    = static_cast<float>(top);
     fLastY      = bot - 1;
     fCurveCount = 0;
     fWinding    = SkToS8(winding);
     fCurveShift = 0;
     return 1;
 }
 
 
 #endif