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image draw: minor optimization

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This commit is contained in:
Gabor Kiss-Vamosi
2018-02-27 11:43:14 +01:00
parent 6f304736c5
commit 9605a6b712
1 changed files with 9 additions and 3 deletions
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lv_draw/lv_draw_vbasic.c
+9 -3
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@@ -370,6 +370,8 @@ void lv_vmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
else {
lv_color_t chroma_key_color = LV_COLOR_TRANSP;
lv_coord_t col;
lv_color_t last_img_px = LV_COLOR_BLACK;
lv_color_t recolored_px = lv_color_mix(recolor, last_img_px, recolor_opa);
for(row = masked_a.y1; row <= masked_a.y2; row++) {
for(col = 0; col < map_useful_w; col++) {
lv_opa_t opa_result = opa;
@@ -381,13 +383,17 @@ void lv_vmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
/*Calculate with the pixel level alpha*/
if(alpha_byte) {
lv_opa_t px_opa = (*(((uint8_t *) px_color) + LV_IMG_PX_SIZE_ALPHA_BYTE - 1));
if(px_opa != LV_OPA_COVER) opa_result = (uint32_t)((uint32_t)px_opa * opa_result) >> 8;
if(px_opa == LV_OPA_TRANSP) continue;
else if(px_opa != LV_OPA_COVER) opa_result = (uint32_t)((uint32_t)px_opa * opa_result) >> 8;
}
/*Re-color the pixel if required*/
if(recolor_opa != LV_OPA_TRANSP) {
lv_color_t recolored_px = lv_color_mix(recolor, *px_color, recolor_opa);
if(last_img_px.full != px_color->full) { /*Minor acceleration: calculate only for new colors (save the last)*/
last_img_px = *px_color;
recolored_px = lv_color_mix(recolor, last_img_px, recolor_opa);
}
if(opa_result == LV_OPA_COVER) vdb_buf_tmp[col].full = recolored_px.full;
else vdb_buf_tmp[col] = lv_color_mix(recolored_px, vdb_buf_tmp[col], opa_result);