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add LV_COLOR_SCREEN_TRANSP

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This commit is contained in:
Gabor Kiss-Vamosi
2018-09-20 22:16:03 +02:00
parent f4ac890a3c
commit 651fd7b133
2 changed files with 110 additions and 3 deletions
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94
lv_draw/lv_draw_vbasic.c
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@@ -40,6 +40,10 @@
static void sw_mem_blend(lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa);
static void sw_color_fill(lv_area_t * mem_area, lv_color_t * mem, const lv_area_t * fill_area, lv_color_t color, lv_opa_t opa);
#if LV_COLOR_SCREEN_TRANSP
static inline lv_color_t color_mix_2_alpha(lv_color_t bg_color, lv_opa_t bg_opa, lv_color_t fg_color, lv_opa_t fg_opa);
#endif
/**********************
* STATIC VARIABLES
**********************/
@@ -88,11 +92,15 @@ void lv_vpx(lv_coord_t x, lv_coord_t y, const lv_area_t * mask_p, lv_color_t col
disp->driver.vdb_wr((uint8_t *)vdb_p->buf, vdb_width, x, y, color, opa);
} else {
lv_color_t * vdb_px_p = vdb_p->buf + y * vdb_width + x;
#if LV_COLOR_SCREEN_TRANSP == 0
if(opa == LV_OPA_COVER) {
*vdb_px_p = color;
} else {
*vdb_px_p = lv_color_mix(color, *vdb_px_p, opa);
}
#else
*vdb_px_p = color_mix_2_alpha(*vdb_px_p, (*vdb_px_p).alpha, color, opa);
#endif
}
}
@@ -340,7 +348,11 @@ void lv_vletter(const lv_point_t * pos_p, const lv_area_t * mask_p,
(col + pos_x) - vdb_p->area.x1, (row + pos_y) - vdb_p->area.y1,
color, px_opa);
} else {
#if LV_COLOR_SCREEN_TRANSP == 0
*vdb_buf_tmp = lv_color_mix(color, *vdb_buf_tmp, px_opa);
#else
*vdb_buf_tmp = color_mix_2_alpha(*vdb_buf_tmp, (*vdb_buf_tmp).alpha, color, px_opa);
#endif
}
}
@@ -512,7 +524,28 @@ void lv_vmap(const lv_area_t * cords_p, const lv_area_t * mask_p,
/*Normal native VDB write*/
else {
if(opa_result == LV_OPA_COVER) vdb_buf_tmp[col] = px_color;
else vdb_buf_tmp[col] = lv_color_mix(px_color, vdb_buf_tmp[col], opa_result);
else {
#if LV_COLOR_SCREEN_TRANSP == 0
vdb_buf_tmp[col] = lv_color_mix(px_color, vdb_buf_tmp[col], opa_result);
#else
vdb_buf_tmp[col] = color_mix_2_alpha(vdb_buf_tmp[col], vdb_buf_tmp[col].alpha, px_color, opa_result);
// if(vdb_buf_tmp[col].alpha == LV_OPA_TRANSP) {
// /* When it is the first visible pixel on the transparent screen
// * simlply use this color and set the pixel opa as backrounds alpha*/
// vdb_buf_tmp[col] = px_color;
// vdb_buf_tmp[col].alpha = opa_result;
// } else {
// /* If already this pixel is already written then for performance reasons
// * don't care with alpha channel
// */
// lv_opa_t bg_opa = vdb_buf_tmp[col].alpha;
// vdb_buf_tmp[col] = lv_color_mix(px_color, vdb_buf_tmp[col], opa_result);
//
// uint16_t opa_tmp = (uint16_t)opa_result + ((bg_opa * (255 - opa_result)) >> 8);
// vdb_buf_tmp[col].alpha = opa_tmp > 0xFF ? 0xFF : opa_tmp ;
// }
#endif
}
}
}
}
@@ -591,16 +624,25 @@ static void sw_color_fill(lv_area_t * mem_area, lv_color_t * mem, const lv_area_
}
/*Calculate with alpha too*/
else {
#if LV_COLOR_SCREEN_TRANSP == 0
lv_color_t bg_tmp = LV_COLOR_BLACK;
lv_color_t opa_tmp = lv_color_mix(color, bg_tmp, opa);
#endif
for(row = fill_area->y1; row <= fill_area->y2; row++) {
for(col = fill_area->x1; col <= fill_area->x2; col++) {
#if LV_COLOR_SCREEN_TRANSP == 0
/*If the bg color changed recalculate the result color*/
if(mem[col].full != bg_tmp.full) {
bg_tmp = mem[col];
opa_tmp = lv_color_mix(color, bg_tmp, opa);
}
mem[col] = opa_tmp;
#else
mem[col] = color_mix_2_alpha(mem[col], mem[col].alpha, color, opa);
#endif
}
mem += mem_width;
}
@@ -608,4 +650,54 @@ static void sw_color_fill(lv_area_t * mem_area, lv_color_t * mem, const lv_area_
}
}
#if LV_COLOR_SCREEN_TRANSP
/**
* Mix two colors. Both color can have alpha value. It requires ARGB888 colors.
* @param bg_color background color
* @param bg_opa alpha of the background color
* @param fg_color foreground color
* @param fg_opa alpha of the foreground color
* @return the mixed color. the alpha channel (color.alpha) contains the result alpha
*/
static inline lv_color_t color_mix_2_alpha(lv_color_t bg_color, lv_opa_t bg_opa, lv_color_t fg_color, lv_opa_t fg_opa)
{
/* Pick the foreground if it's fully opaque or the Background is fully transparent*/
if(fg_opa == LV_OPA_COVER && bg_opa <= LV_OPA_MIN) {
fg_color.alpha = fg_opa;
return fg_color;
}
/*Transparent foreground: use the Background*/
else if(fg_opa <= LV_OPA_MIN) {
return bg_color;
}
/*Opaque background: use simple mix*/
else if (bg_opa >= LV_OPA_MAX) {
return lv_color_mix(fg_color, bg_color, fg_opa);
}
/*Both colors have alpha. Expensive calculation need to be applied*/
else {
/*Save the parameters and the result. If they will be asked again don't compute again*/
static lv_opa_t fg_opa_save = 0;
static lv_opa_t bg_opa_save = 0;
static lv_color_t c = {0};
if(fg_opa != fg_opa_save || bg_opa != bg_opa_save) {
fg_opa_save = fg_opa;
bg_opa_save = bg_opa;
/*Info: https://en.wikipedia.org/wiki/Alpha_compositing#Analytical_derivation_of_the_over_operator*/
lv_opa_t alpha_res = 255 - ((uint16_t)((uint16_t)(255 - fg_opa) * (255 - bg_opa)) >> 8);
if(alpha_res == 0) {
while(1);
}
lv_opa_t ratio = (uint16_t)((uint16_t) fg_opa * 255) / alpha_res;
c = lv_color_mix(fg_color, bg_color, ratio);
c.alpha = alpha_res;
}
return c;
}
}
#endif /*LV_COLOR_SCREEN_TRANSP*/
#endif