background_alpha (reference) in projects: third_party - OpenGrok search results

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Searched refs:background_alpha (Results 1 - 1 of 1) sorted by relevance

/third_party/ffmpeg/libavcodec/
H A D	pngdec.c	1120 uint8_t foreground_alpha, background_alpha, output_alpha; in handle_p_frame_apng() local 1124 // output_alpha = foreground_alpha + (1 - foreground_alpha) * background_alpha in handle_p_frame_apng() 1125 // output = (foreground_alpha * foreground + (1 - foreground_alpha) * background_alpha * background) / output_alpha in handle_p_frame_apng() 1130 background_alpha = background[3]; in handle_p_frame_apng() 1135 background_alpha = background[1]; in handle_p_frame_apng() 1147 output_alpha = foreground_alpha + FAST_DIV255((255 - foreground_alpha) * background_alpha); in handle_p_frame_apng() 1154 } else if (background_alpha == 255) { in handle_p_frame_apng() 1157 output[b] = (255 * foreground_alpha * foreground[b] + (255 - foreground_alpha) * background_alpha * background[b]) / (255 * output_alpha); in handle_p_frame_apng()

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