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TGA RLE flag and regression fix 

Add requested flag for controlling TGA RLE compression and fix a
regression when writing monochrome TGAs.
This commit is contained in:
fahickman 2015-07-03 14:27:29 -07:00
parent 126ec22867
commit 80a0e90d53
1 changed files with 9 additions and 2 deletions
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11
stb_image_write.h
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@ -129,6 +129,8 @@ extern int stbi_write_hdr(char const *filename, int w, int h, int comp, const fl
typedef unsigned int stbiw_uint32;
typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
static int stbi__write_tga_with_rle = 1;
static void writefv(FILE *f, const char *fmt, va_list v)
{
while (*fmt) {
@ -247,15 +249,20 @@ int stbi_write_tga(char const *filename, int x, int y, int comp, const void *dat
{
int has_alpha = (comp == 2 || comp == 4);
int colorbytes = has_alpha ? comp-1 : comp;
int format = colorbytes < 2 ? 11 : 10; // 3 color channels (RGB/RGBA) = 10, 1 color channel (Y/YA) = 11
int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3
FILE *f;
if (!stbi__write_tga_with_rle) {
return outfile(filename, -1, -1, x, y, comp, 0, (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);
}
if (y < 0 || x < 0) return 0;
f = fopen(filename, "wb");
if (f) {
int i,j,k;
writef(f, "111 221 2222 11", 0,0,format, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha);
writef(f, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8);
for (j = y - 1; j >= 0; --j) {
const unsigned char *row = (unsigned char *) data + j * x * comp;