float components in xfermodes

src/core/SkCoreBlitters.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 SkCoreBlitters_DEFINED
 #define SkCoreBlitters_DEFINED
 
@@ skipping 152 matching lines @@
 class SkARGB32_Shader_Blitter : public SkShaderBlitter {
 public:
     SkARGB32_Shader_Blitter(const SkPixmap& device, const SkPaint& paint,
                             SkShader::Context* shaderContext);
     virtual ~SkARGB32_Shader_Blitter();
     void blitH(int x, int y, int width) override;
     void blitV(int x, int y, int height, SkAlpha alpha) override;
     void blitRect(int x, int y, int width, int height) override;
     void blitAntiH(int x, int y, const SkAlpha[], const int16_t[]) override;
     void blitMask(const SkMask&, const SkIRect&) override;
-
+    
 private:
     SkXfermode*         fXfermode;
     SkPMColor*          fBuffer;
     SkBlitRow::Proc32   fProc32;
     SkBlitRow::Proc32   fProc32Blend;
     bool                fShadeDirectlyIntoDevice;
     bool                fConstInY;
-
+    
     // illegal
     SkARGB32_Shader_Blitter& operator=(const SkARGB32_Shader_Blitter&);
+    
+    typedef SkShaderBlitter INHERITED;
+};
 
-    typedef SkShaderBlitter INHERITED;
+class SkARGB32_Shader4f_Blitter : public SkARGB32_Shader_Blitter {
+public:
+    SkARGB32_Shader4f_Blitter(const SkPixmap& device, const SkPaint& paint,
+                              SkShader::Context* shaderContext);
+    virtual ~SkARGB32_Shader4f_Blitter();
+    void blitH(int x, int y, int width) override;
+    void blitV(int x, int y, int height, SkAlpha alpha) override;
+    void blitRect(int x, int y, int width, int height) override;
+    void blitAntiH(int x, int y, const SkAlpha[], const int16_t[]) override;
+    void blitMask(const SkMask&, const SkIRect&) override;
+    
+private:
+    SkXfermode::PM4fState   fState;
+    SkXfermode::PM4fProc1   fProc1;
+    SkXfermode::PM4fProcN   fProcN;
+    SkPM4f*                 fBuffer;
+    bool                    fConstInY;
+    
+    // illegal
+    SkARGB32_Shader4f_Blitter& operator=(const SkARGB32_Shader4f_Blitter&);

[mtklein, 2016/02/01 22:53:52]

doesn't hurt to add "= delete" to these now.

[reed1, 2016/02/02 14:20:54]

Clearly this was copy-paste from above. Is "= delete" something we should
manually add to all of the shader subclasses?

+    
+    typedef SkARGB32_Shader_Blitter INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 /*  These return the correct subclass of blitter for their device config.
 
     Currently, they make the following assumptions about the state of the
     paint:
 
     1. If there is an xfermode, there will also be a shader
     2. If there is a colorfilter, there will be a shader that itself handles
        calling the filter, so the blitter can always ignore the colorfilter obj
 
     These pre-conditions must be handled by the caller, in our case
     SkBlitter::Choose(...)
  */
 
 SkBlitter* SkBlitter_ChooseD565(const SkPixmap& device, const SkPaint& paint,
                                 SkShader::Context* shaderContext,
                                 SkTBlitterAllocator* allocator);
 
 #endif