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REVIEW: ImageAlphaMask()

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When adding alpha mask to GRAYSCALE image, if using ImageFormat(), it could change pixel values, now we avoid that, mask is just added as an extra channel
This commit is contained in:
Ray 2019-10-11 20:08:41 +02:00
parent 161c8b7d08
commit 12d3e21f1b
1 changed files with 8 additions and 3 deletions
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11
src/textures.c
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@ -1181,13 +1181,18 @@ void ImageAlphaMask(Image *image, Image alphaMask)
// In case image is only grayscale, we just add alpha channel // In case image is only grayscale, we just add alpha channel
if (image->format == UNCOMPRESSED_GRAYSCALE) if (image->format == UNCOMPRESSED_GRAYSCALE)
{ {
ImageFormat(image, UNCOMPRESSED_GRAY_ALPHA); unsigned char *data = (unsigned char *)RL_MALLOC(image->width*image->height*2);
// Apply alpha mask to alpha channel // Apply alpha mask to alpha channel
for (int i = 0, k = 1; (i < mask.width*mask.height) || (i < image->width*image->height); i++, k += 2) for (int i = 0, k = 0; (i < mask.width*mask.height) || (i < image->width*image->height); i++, k += 2)
{ {
((unsigned char *)image->data)[k] = ((unsigned char *)mask.data)[i]; data[k] = ((unsigned char *)image->data)[i];
data[k + 1] = ((unsigned char *)mask.data)[i];
} }
RL_FREE(image->data);
image->data = data;
image->format = UNCOMPRESSED_GRAY_ALPHA;
} }
else else
{ {