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Added function: ImageAlphaMask()

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This commit is contained in:
Ray
2016-09-05 10:08:28 +02:00
parent a9ab516dae
commit 9d66bc4a05
2 changed files with 31 additions and 2 deletions
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32
src/textures.c
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@@ -548,7 +548,7 @@ void ImageFormat(Image *image, int newFormat)
{
if (image->format != newFormat)
{
if ((image->format < 8) && (newFormat < 8))
if ((image->format < COMPRESSED_DXT1_RGB) && (newFormat < COMPRESSED_DXT1_RGB))
{
Color *pixels = GetImageData(*image);
@@ -676,12 +676,40 @@ void ImageFormat(Image *image, int newFormat)
}
}
// Apply alpha mask to image
// NOTE: alphaMask must be should be same size as image
void ImageAlphaMask(Image *image, Image alphaMask)
{
if (image->format >= COMPRESSED_DXT1_RGB)
{
TraceLog(WARNING, "Alpha mask can not be applied to compressed data formats");
return;
}
else
{
// Force mask to be Grayscale
Image mask = ImageCopy(alphaMask);
ImageFormat(&mask, UNCOMPRESSED_GRAYSCALE);
// Convert image to RGBA
if (image->format != UNCOMPRESSED_R8G8B8A8) ImageFormat(image, UNCOMPRESSED_R8G8B8A8);
// Apply alpha mask to alpha channel
for (int i = 0, k = 3; (i < mask.width*mask.height) || (i < image->width*image->height); i++, k += 4)
{
((unsigned char *)image->data)[k] = ((unsigned char *)mask.data)[i];
}
UnloadImage(mask);
}
}
// Dither image data to 16bpp or lower (Floyd-Steinberg dithering)
// NOTE: In case selected bpp do not represent an known 16bit format,
// dithered data is stored in the LSB part of the unsigned short
void ImageDither(Image *image, int rBpp, int gBpp, int bBpp, int aBpp)
{
if (image->format >= 8)
if (image->format >= COMPRESSED_DXT1_RGB)
{
TraceLog(WARNING, "Compressed data formats can not be dithered");
return;