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Add alpha blending to background image

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This commit is contained in:
mkwong98 2019-08-31 23:24:06 +08:00
parent bdec75af4d
commit 196a5e42e9
1 changed files with 21 additions and 26 deletions
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47
Core/HdNesPack.cpp
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@ -55,32 +55,27 @@ void HdNesPack::DrawCustomBackground(uint32_t *outputBuffer, uint32_t x, uint32_
uint8_t brightness = _hdData->Backgrounds[_backgroundIndex].Brightness;
uint32_t width = _hdData->Backgrounds[_backgroundIndex].Data->Width;
uint32_t *pngData = _hdData->Backgrounds[_backgroundIndex].data() + (y * _hdData->Scale * width) + (x * _hdData->Scale);
if (scale == 1) {
if (brightness == 255) {
*outputBuffer = *pngData;
}
else {
*outputBuffer = AdjustBrightness((uint8_t*)pngData, brightness);
}
}
else {
uint32_t* buffer = outputBuffer;
for (uint32_t i = 0; i < scale; i++) {
memcpy(outputBuffer, pngData, sizeof(uint32_t) * scale);
outputBuffer += screenWidth;
pngData += width;
}
if (brightness < 255) {
for (uint32_t i = 0; i < scale; i++) {
for (uint32_t j = 0; j < scale; j++) {
*buffer = AdjustBrightness((uint8_t*)buffer, brightness);
buffer++;
}
buffer += screenWidth - scale;
}
}
uint32_t pixelColor;
for (uint32_t i = 0; i < scale; i++) {
for (uint32_t j = 0; j < scale; j++) {
if (brightness == 255) {
pixelColor = *pngData;
}
else {
pixelColor = AdjustBrightness((uint8_t*)pngData, brightness);
}
if (((uint8_t*)pngData)[3] == 0xff) {
*outputBuffer = pixelColor;
}
else if (((uint8_t*)pngData)[3]) {
BlendColors((uint8_t*)outputBuffer, (uint8_t*)(&pixelColor));
}
outputBuffer++;
pngData++;
}
outputBuffer += screenWidth - scale;
pngData += width - scale;
}
}