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Add new alphaBlend functions

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Added 24 bit colour handling alphaBlend to reduce precision loss in multiple blend stages (e.g. in 2D colour gradients). Added option for alpha dither to reduce colour banding in gradients with 16 bit colours.

Get rid of compile warnings.
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Bodmer committed 2020-01-30 16:01:36 +00:00
1 parent 0e0fd75277
commit 8209c00316
8 files changed
+139 -242
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Extensions/Sprite.cpp
+1 -1
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@@ -827,7 +827,7 @@ void TFT_eSprite::pushSprite(int32_t x, int32_t y, uint16_t transp)
*************************************************************************************x*/
uint8_t TFT_eSprite::readPixelValue(int32_t x, int32_t y)
{
if ((x < 0) || (x >= _iwidth) || (y < 0) || (y >= _iheight) || !_created) return 0xFFFF;
if ((x < 0) || (x >= _iwidth) || (y < 0) || (y >= _iheight) || !_created) return 0xFF;
if (_bpp == 4)
{