Bilerp + mirror + perspective

src/core/SkBitmapProcState.h

 /*
  * Copyright 2007 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 SkBitmapProcState_DEFINED
 #define SkBitmapProcState_DEFINED
 
@@ skipping 17 matching lines @@
 class SkPaint;
 
 struct SkBitmapProcInfo {
     SkBitmapProcInfo(const SkBitmapProvider&, SkShader::TileMode tmx, SkShader::TileMode tmy);
     SkBitmapProcInfo(const SkBitmap&, SkShader::TileMode tmx, SkShader::TileMode tmy);
     ~SkBitmapProcInfo();
 
     const SkBitmapProvider fProvider;
 
     SkPixmap            fPixmap;
-    SkMatrix            fInvMatrix;         // copy of what is in fBMState, can we remove the dup?
+    SkMatrix            fInvMatrix;         // This changes based on tile mode.
+    SkMatrix            fRealInvMatrix;     // The actual inverse matrix.

[f(malita), 2016/03/22 20:55:26]

Do we actually need/use the fInvMatrix adjustment for the linear pipeline? 
Rather than adding fRealInvMatrix, could we just skip the adjustment?

[herb_g, 2016/03/22 21:10:40]

I'll add a todo to clean this up.

     SkColor             fPaintColor;
     SkShader::TileMode  fTileModeX;
     SkShader::TileMode  fTileModeY;
     SkFilterQuality     fFilterQuality;
     SkMatrix::TypeMask  fInvType;
 
     bool init(const SkMatrix& inverse, const SkPaint&);
 
 private:
     enum {
@@ skipping 204 matching lines @@
     SkFixed fixedY() const { return SkFractionalIntToFixed(fY); }
 
     int intX() const { return SkFractionalIntToInt(fX); }
     int intY() const { return SkFractionalIntToInt(fY); }
 
 private:
     SkFractionalInt fX, fY;
 };
 
 #endif