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tweak TGA monochrome support

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This commit is contained in:
Sean Barrett 2014-08-16 13:52:47 -07:00
parent caf6d08f2b
commit 7e079c670d
1 changed files with 2 additions and 2 deletions
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4
stb_image_write.h
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@ -178,8 +178,8 @@ int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *dat
int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
{
int has_alpha = !(comp & 1);
int colorbytes = comp - has_alpha;
int has_alpha = (comp == 2 || comp == 4);
int colorbytes = has_alpha ? comp-1 : comp;
int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3
return outfile(filename, -1,-1, x, y, comp, (void *) data, has_alpha, 0,
"111 221 2222 11", 0,0,format, 0,0,0, 0,0,x,y, (colorbytes+has_alpha)*8, has_alpha*8);