Lines Matching refs:bg
2902 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2904 # define png_composite(composite, fg, alpha, bg) \
2906 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2910 # define png_composite_16(composite, fg, alpha, bg) \
2912 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2918 # define png_composite(composite, fg, alpha, bg) \
2920 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2923 # define png_composite_16(composite, fg, alpha, bg) \
2925 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
