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| author | inmarket <andrewh@inmarket.com.au> | 2013-08-01 14:52:28 +1000 |
|---|---|---|
| committer | inmarket <andrewh@inmarket.com.au> | 2013-08-01 14:52:28 +1000 |
| commit | 9d2b0b667b9bfb2d8b6969ade0ff0bd8d646d7d7 (patch) | |
| tree | 08ee00d6ad2de75976131b2e24053484ff473403 /src | |
| parent | 2d27673f0f45a1b96aa7b9d8de61807fadb020bc (diff) | |
| download | uGFX-9d2b0b667b9bfb2d8b6969ade0ff0bd8d646d7d7.tar.gz uGFX-9d2b0b667b9bfb2d8b6969ade0ff0bd8d646d7d7.tar.bz2 uGFX-9d2b0b667b9bfb2d8b6969ade0ff0bd8d646d7d7.zip | |
Add color blending to GDISP
Diffstat (limited to 'src')
| -rw-r--r-- | src/gdisp/gdisp.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/gdisp/gdisp.c b/src/gdisp/gdisp.c index 4c005079..b59b571d 100644 --- a/src/gdisp/gdisp.c +++ b/src/gdisp/gdisp.c @@ -990,6 +990,27 @@ void gdispDrawBox(coord_t x, coord_t y, coord_t cx, coord_t cy, color_t color) { } #endif +color_t gdispBlendColor(color_t fg, color_t bg, uint8_t alpha) +{ + uint16_t fg_ratio = alpha + 1; + uint16_t bg_ratio = 256 - alpha; + uint16_t r, g, b; + + r = RED_OF(fg) * fg_ratio; + g = GREEN_OF(fg) * fg_ratio; + b = BLUE_OF(fg) * fg_ratio; + + r += RED_OF(bg) * bg_ratio; + g += GREEN_OF(bg) * bg_ratio; + b += BLUE_OF(bg) * bg_ratio; + + r /= 256; + g /= 256; + b /= 256; + + return RGB2COLOR(r, g, b); +} + #if (!defined(gdispPackPixels) && !defined(GDISP_PIXELFORMAT_CUSTOM)) void gdispPackPixels(pixel_t *buf, coord_t cx, coord_t x, coord_t y, color_t color) { /* No mutex required as we only read static data */ |