191                                 COMP_PREFIX ## G, COMP_PREFIX ## B)
 192 
 193 #define Extract4ByteArgbCompsAndAlphaFromArgb(pixel, COMP_PREFIX) \
 194     Extract3ByteRgbCompsAndAlphaFromArgb(pixel, COMP_PREFIX)
 195 
 196 #define Extract1ByteGrayCompsAndAlphaFromArgb(pixel, COMP_PREFIX) \
 197     do { \
 198         int r, g, b; \
 199         ExtractIntDcmComponents1234(pixel, COMP_PREFIX ## A, r, g, b); \
 200         COMP_PREFIX ## G = ComposeByteGrayFrom3ByteRgb(r, g, b); \
 201     } while (0)
 202 
 203 #define Extract1ShortGrayCompsAndAlphaFromArgb(pixel, COMP_PREFIX) \
 204     do { \
 205         int r, g, b; \
 206         ExtractIntDcmComponents1234(pixel, COMP_PREFIX ## A, r, g, b); \
 207         COMP_PREFIX ## G = ComposeUshortGrayFrom3ByteRgb(r, g, b); \
 208         COMP_PREFIX ## A = (COMP_PREFIX ## A << 8) + COMP_PREFIX ## A; \
 209     } while (0)
 210 







 211 #endif /* IntArgb_h_Included */

 191                                 COMP_PREFIX ## G, COMP_PREFIX ## B)
 192 
 193 #define Extract4ByteArgbCompsAndAlphaFromArgb(pixel, COMP_PREFIX) \
 194     Extract3ByteRgbCompsAndAlphaFromArgb(pixel, COMP_PREFIX)
 195 
 196 #define Extract1ByteGrayCompsAndAlphaFromArgb(pixel, COMP_PREFIX) \
 197     do { \
 198         int r, g, b; \
 199         ExtractIntDcmComponents1234(pixel, COMP_PREFIX ## A, r, g, b); \
 200         COMP_PREFIX ## G = ComposeByteGrayFrom3ByteRgb(r, g, b); \
 201     } while (0)
 202 
 203 #define Extract1ShortGrayCompsAndAlphaFromArgb(pixel, COMP_PREFIX) \
 204     do { \
 205         int r, g, b; \
 206         ExtractIntDcmComponents1234(pixel, COMP_PREFIX ## A, r, g, b); \
 207         COMP_PREFIX ## G = ComposeUshortGrayFrom3ByteRgb(r, g, b); \
 208         COMP_PREFIX ## A = (COMP_PREFIX ## A << 8) + COMP_PREFIX ## A; \
 209     } while (0)
 210 
 211 /*
 212  * SrcOver ## TYPE ## BlendFactor
 213  * Returns appropriate blend value for use in blending calculations.
 214  */
 215 #define SrcOverIntArgbBlendFactor(dF, dA) \
 216     (dA)
 217 
 218 #endif /* IntArgb_h_Included */