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PicoGraphics: Implement RGB888 alpha blending.

pull/1019/head
Phil Howard 2024-11-21 22:28:10 +00:00
rodzic 18d3ed3940
commit ad5120a8d2
1 zmienionych plików z 23 dodań i 7 usunięć
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30
libraries/pico_graphics/pico_graphics_pen_rgb888.cpp
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@ -38,19 +38,35 @@ namespace pimoroni {
}
bool PicoGraphics_PenRGB888::render_tile(const Tile *tile) {
for(int y = 0; y < tile->h; y++) {
uint8_t *palpha = &tile->data[(y * tile->stride)];
uint32_t *pdest = &((uint32_t *)frame_buffer)[tile->x + ((tile->y + y) * bounds.w)];
uint8_t *p_alpha = &tile->data[(y * tile->stride)];
uint32_t *p_dest = &((uint32_t *)frame_buffer)[tile->x + ((tile->y + y) * bounds.w)];
for(int x = 0; x < tile->w; x++) {
uint8_t alpha = *palpha;
uint16_t dest = *p_dest;
uint8_t alpha = *p_alpha;
// TODO: Alpha blending
if(alpha == 0) {
if(alpha == 255) {
*p_dest = color;
}else if(alpha == 0) {
} else {
*pdest = color;
// blend tha pixel
uint32_t sr = (color >> 16) & 0xff;
uint32_t sg = (color >> 8) & 0xff;
uint32_t sb = (color >> 0) & 0xff;
uint32_t dr = (dest >> 16) & 0xff;
uint32_t dg = (dest >> 8) & 0xff;
uint32_t db = (dest >> 0) & 0xff;
uint8_t r = ((sr * alpha) + (dr * (255 - alpha))) >> 8;
uint8_t g = ((sg * alpha) + (dg * (255 - alpha))) >> 8;
uint8_t b = ((sb * alpha) + (db * (255 - alpha))) >> 8;
*p_dest = (r << 16) | (g << 8) | b;
}
pdest++;
palpha++;
p_dest++;
p_alpha++;
}
}