Plugins (alphablend): Fix calculation of alpha.

kaixiong · kaixiong · commit b40b4f7feb90 · 2025-01-26T02:58:59.000+08:00
diff --git a/libvisual-plugins/plugins/morph/alphablend/morph_alphablend.c b/libvisual-plugins/plugins/morph/alphablend/morph_alphablend.c
@@ -88,9 +88,9 @@ static void lv_morph_alpha_apply (VisPluginData *plugin, float progress, VisAudi
 	                    progress);
 }
 
-static inline void alpha_blend_buffer (uint8_t *dest, uint8_t *src1, uint8_t *src2, int size, int depth, float alpha)
+static inline void alpha_blend_buffer (uint8_t *dest, uint8_t *src1, uint8_t *src2, int size, int depth, float progress)
 {
-	uint8_t a = alpha * (1/255.0);
+	uint8_t a = progress * 255;
 
 	switch (depth) {
 		case VISUAL_VIDEO_DEPTH_8BIT:

Original file line number	Diff line number	Diff line change
`@@ -88,9 +88,9 @@ static void lv_morph_alpha_apply (VisPluginData *plugin, float progress, VisAudi`
`88`	`88`	`progress);`
`89`	`89`	`}`
`90`	`90`
`91`		`-static inline void alpha_blend_buffer (uint8_t dest, uint8_t src1, uint8_t *src2, int size, int depth, float alpha)`
	`91`	`+static inline void alpha_blend_buffer (uint8_t dest, uint8_t src1, uint8_t *src2, int size, int depth, float progress)`
`92`	`92`	`{`
`93`		`- uint8_t a = alpha * (1/255.0);`
	`93`	`+ uint8_t a = progress * 255;`
`94`	`94`
`95`	`95`	`switch (depth) {`
`96`	`96`	`case VISUAL_VIDEO_DEPTH_8BIT:`