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we now theoreticly support greyscale tga files too :)

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This commit is contained in:
Bill Currie 2003-03-21 05:03:32 +00:00
parent 6c850c5528
commit 3e349ee52c
1 changed files with 100 additions and 4 deletions
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104
libs/util/tga.c
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@ -105,6 +105,26 @@ reverse_blit_rgba (byte *buf, int count, byte red, byte green, byte blue,
return buf;
}
static inline byte *
blit_la (byte *buf, int count, byte lum, byte alpha)
{
while (count--) {
*buf++ = lum;
*buf++ = alpha;
}
return buf;
}
static inline byte *
reverse_blit_la (byte *buf, int count, byte lum, byte alpha)
{
while (count--) {
*buf-- = alpha;
*buf-- = lum;
}
return buf;
}
static inline byte *
read_bgr (byte *buf, int count, byte **data, cmap_t *cmap)
{
@ -171,6 +191,24 @@ reverse_read_cmap (byte *buf, int count, byte **data, cmap_t *cmap)
return reverse_blit_rgba (buf, count, red, green, blue, alpha);
}
static inline byte *
read_l (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte lum = *(*data)++;
byte alpha = 255;
return blit_la (buf, count, lum, alpha);
}
static inline byte *
reverse_read_l (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte lum = *(*data)++;
byte alpha = 255;
return reverse_blit_la (buf, count, lum, alpha);
}
static inline void
setup_pixrow_span (TargaHeader *targa, tex_t *tex, byte **_pixrow, int *_span)
{
@ -469,11 +507,12 @@ decode_truecolor (TargaHeader *targa, tex_t *tex, byte *dataByte)
tex->format = tex_rgb;
decode_truecolor_24 (targa, tex, dataByte);
break;
default:
case 32:
tex->format = tex_rgba;
decode_truecolor_32 (targa, tex, dataByte);
break;
default:
Sys_Error ("LoadTGA: unsupported pixel size");
}
}
@ -485,25 +524,82 @@ decode_truecolor_rle (TargaHeader *targa, tex_t *tex, byte *dataByte)
tex->format = tex_rgb;
decode_truecolor_24_rle (targa, tex, dataByte);
break;
default:
case 32:
tex->format = tex_rgba;
decode_truecolor_32_rle (targa, tex, dataByte);
break;
default:
Sys_Error ("LoadTGA: unsupported truecolor pixel size");
}
}
static void
decode_greyscale (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
byte *pixcol, *pixrow;
int column, columns, rows, span;
if (targa->pixel_size != 8)
Sys_Error ("LoadTGA: unsupported truecolor pixel size");
tex->format = tex_la;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span);
if (targa->attributes & 0x10) {
// right to left
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = reverse_read_l (pixcol, 1, &dataByte, 0);
pixrow += span;
}
} else {
// left to right
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = read_l (pixcol, 1, &dataByte, 0);
pixrow += span;
}
}
}
static void
decode_greyscale_rle (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
byte *pixcol, *pixrow;
int column, columns, rows, span;
cmap_t *cmap = 0; // not really used but needed for rle_expand
if (targa->pixel_size != 8)
Sys_Error ("LoadTGA: unsupported truecolor pixel size");
tex->format = tex_la;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span);
if (targa->attributes & 0x10) // right to left
rle_expand (reverse_read_l);
else // left to right
rle_expand (read_l);
}
typedef void (*decoder_t) (TargaHeader *, tex_t *, byte *);
static decoder_t decoder_functions[] = {
0, // 0 invalid
decode_colormap,
decode_truecolor,
0, // decode_greyscal
decode_greyscale,
0, 0, 0, 0, // 5-7 invalid
0, // 8 invalid
decode_colormap_rle,
decode_truecolor_rle,
0, // decode_greyscal
decode_greyscale_rle,
0, 0, 0, 0, // 12-15 invalid
};
#define NUM_DECODERS (sizeof (decoder_functions) \