SkAlpha constant defs

include/core/SkColor.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 SkColor_DEFINED
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 #define SkColorGetG(color)      (((color) >>  8) & 0xFF)
 /** return the blue byte from a SkColor value */
 #define SkColorGetB(color)      (((color) >>  0) & 0xFF)
 
 static inline SkColor SkColorSetA(SkColor c, U8CPU a) {
     return (c & 0x00FFFFFF) | (a << 24);
 }
 
 // common colors
 
+#define SK_AlphaTRANSPARENT 0x00        //!< transparent SkAlpha value
+#define SK_AlphaOPAQUE      0xFF        //!< opaque SkAlpha value
+
 #define SK_ColorTRANSPARENT 0x00000000  //!< transparent SkColor value
 
 #define SK_ColorBLACK       0xFF000000  //!< black SkColor value
 #define SK_ColorDKGRAY      0xFF444444  //!< dark gray SkColor value
 #define SK_ColorGRAY        0xFF888888  //!< gray SkColor value
 #define SK_ColorLTGRAY      0xFFCCCCCC  //!< light gray SkColor value
 #define SK_ColorWHITE       0xFFFFFFFF  //!< white SkColor value
 
 #define SK_ColorRED         0xFFFF0000  //!< red SkColor value
 #define SK_ColorGREEN       0xFF00FF00  //!< green SkColor value
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 /** Define a function pointer type for combining two premultiplied colors
 */
 typedef SkPMColor (*SkXfermodeProc)(SkPMColor src, SkPMColor dst);
 
 /** Define a function pointer type for combining a premultiplied src color
     and a 16bit device color.
 */
 typedef uint16_t (*SkXfermodeProc16)(SkPMColor src, uint16_t dst);
 
 #endif