start experimenting with 64bit frame-buffers

include/core/SkXfermode.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 SkXfermode_DEFINED
@@ skipping 228 matching lines @@
     };
     typedef void (*PM4fProc1)(const PM4fState&, uint32_t dst[], const SkPM4f& src,
                               int count, const SkAlpha coverage[]);
     typedef void (*PM4fProcN)(const PM4fState&, uint32_t dst[], const SkPM4f src[],
                               int count, const SkAlpha coverage[]);
     static PM4fProc1 GetPM4fProc1(Mode, uint32_t flags);
     static PM4fProcN GetPM4fProcN(Mode, uint32_t flags);
     virtual PM4fProc1 getPM4fProc1(uint32_t flags) const;
     virtual PM4fProcN getPM4fProcN(uint32_t flags) const;
 
+    enum U64Flags {
+        kSrcIsOpaque_U64Flag  = 1 << 0,
+        kDstIsFloat16_U64Flag = 1 << 1, // else U16 bit components
+    };
+    struct U64State {
+        const SkXfermode* fXfer;
+        uint32_t          fFlags;
+    };
+    typedef void (*U64Proc1)(const U64State&, uint64_t dst[], const SkPM4f& src, int count,
+                             const SkAlpha coverage[]);
+    typedef void (*U64ProcN)(const U64State&, uint64_t dst[], const SkPM4f src[], int count,
+                             const SkAlpha coverage[]);
+    static U64Proc1 GetU64Proc1(Mode, uint32_t flags);
+    static U64ProcN GetU64ProcN(Mode, uint32_t flags);
+
 protected:
     SkXfermode() {}
     /** The default implementation of xfer32/xfer16/xferA8 in turn call this
         method, 1 color at a time (upscaled to a SkPMColor). The default
         implementation of this method just returns dst. If performance is
         important, your subclass should override xfer32/xfer16/xferA8 directly.
 
         This method will not be called directly by the client, so it need not
         be implemented if your subclass has overridden xfer32/xfer16/xferA8
     */
     virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const;
 
 private:
     enum {
         kModeCount = kLastMode + 1
     };
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif