54 static u8 blend_channel(u8 src, u8 dst, u8 alpha)  in blend_channel()  argument
59 	pre_blend = (src * 255 + dst * (255 - alpha));  in blend_channel()
68  * alpha_blend - alpha blending equation
69  * @argb_src: src pixel on premultiplied alpha mode
73  * is that pixel color values have been already pre-multiplied with the alpha
79 	u8 alpha;  in alpha_blend()  local
81 	alpha = argb_src[3];  in alpha_blend()
82 	argb_dst[0] = blend_channel(argb_src[0], argb_dst[0], alpha);  in alpha_blend()
83 	argb_dst[1] = blend_channel(argb_src[1], argb_dst[1], alpha);  in alpha_blend()
84 	argb_dst[2] = blend_channel(argb_src[2], argb_dst[2], alpha);  in alpha_blend()
88  * x_blend - blending equation that ignores the pixel alpha
107  * and clearing alpha channel to an completely opaque background. This function
145 			/* clearing alpha channel (0xff)*/  in blend()