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fix monochrome bmp support

This commit is contained in:
Sean Barrett 2015-01-17 07:15:50 -08:00
parent 6e0ae49f87
commit 6639ef6d5a
1 changed files with 11 additions and 7 deletions
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18
stb_image_write.h
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@ -108,7 +108,7 @@ static void write3(FILE *f, unsigned char a, unsigned char b, unsigned char c)
fwrite(arr, 3, 1, f);
}
static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad)
static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono)
{
unsigned char bg[3] = { 255, 0, 255}, px[3];
stbiw_uint32 zero = 0;
@ -128,8 +128,12 @@ static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp,
if (write_alpha < 0)
fwrite(&d[comp-1], 1, 1, f);
switch (comp) {
case 1:
case 2: fwrite(d, 1, 1, f);
case 1: fwrite(d, 1, 1, f);
break;
case 2: if (expand_mono)
write3(f, d[0],d[0],d[0]); // monochrome bmp
else
fwrite(d, 1, 1, f); // monochrome TGA
break;
case 4:
if (!write_alpha) {
@ -151,7 +155,7 @@ static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp,
}
}
static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, const char *fmt, ...)
static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...)
{
FILE *f;
if (y < 0 || x < 0) return 0;
@ -161,7 +165,7 @@ static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, in
va_start(v, fmt);
writefv(f, fmt, v);
va_end(v);
write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad);
write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad,expand_mono);
fclose(f);
}
return f != NULL;
@ -170,7 +174,7 @@ static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, in
int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data)
{
int pad = (-x*3) & 3;
return outfile(filename,-1,-1,x,y,comp,(void *) data,0,pad,
return outfile(filename,-1,-1,x,y,comp,1,(void *) data,0,pad,
"11 4 22 4" "4 44 22 444444",
'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header
40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header
@ -181,7 +185,7 @@ 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 ? 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,
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);
}