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quakeforge/libs/image/tga.c

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/*
tga.c
targa image handling
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include "QF/image.h"
#include "QF/qendian.h"
#include "QF/quakefs.h"
#include "QF/sys.h"
#include "QF/tga.h"
#include "QF/zone.h"
#include "QF/GL/defines.h"
#include "compat.h"
typedef struct {
byte red;
byte green;
byte blue;
byte alpha;
} cmap_t;
static inline byte *
blit_rgb (byte *buf, int count, byte red, byte green, byte blue)
{
while (count--) {
*buf++ = red;
*buf++ = green;
*buf++ = blue;
*buf++ = 255;
}
return buf;
}
static inline byte *
blit_rgba (byte *buf, int count, byte red, byte green, byte blue, byte alpha)
{
while (count--) {
*buf++ = red;
*buf++ = green;
*buf++ = blue;
*buf++ = alpha;
}
return buf;
}
static inline byte *
reverse_blit_rgb (byte *buf, int count, byte red, byte green, byte blue)
{
while (count--) {
*buf-- = 255;
*buf-- = blue;
*buf-- = green;
*buf-- = red;
}
return buf;
}
static inline byte *
reverse_blit_rgba (byte *buf, int count, byte red, byte green, byte blue,
byte alpha)
{
while (count--) {
*buf-- = alpha;
*buf-- = blue;
*buf-- = green;
*buf-- = red;
}
return buf;
}
static inline byte *
blit_l (byte *buf, int count, byte lum)
{
while (count--) {
*buf++ = lum;
}
return buf;
}
static inline byte *
reverse_blit_l (byte *buf, int count, byte lum)
{
while (count--) {
*buf-- = lum;
}
return buf;
}
static inline byte *
read_bgr (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte blue = *(*data)++;
byte green = *(*data)++;
byte red = *(*data)++;
return blit_rgb (buf, count, red, green, blue);
}
static inline byte *
read_bgra (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte blue = *(*data)++;
byte green = *(*data)++;
byte red = *(*data)++;
byte alpha = *(*data)++;
return blit_rgba (buf, count, red, green, blue, alpha);
}
static inline byte *
reverse_read_bgr (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte blue = *(*data)++;
byte green = *(*data)++;
byte red = *(*data)++;
return reverse_blit_rgb (buf, count, red, green, blue);
}
static inline byte *
reverse_read_bgra (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte blue = *(*data)++;
byte green = *(*data)++;
byte red = *(*data)++;
byte alpha = *(*data)++;
return reverse_blit_rgba (buf, count, red, green, blue, alpha);
}
static inline byte *
read_cmap (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte ind = *(*data)++;
byte red = cmap[ind].red;
byte green = cmap[ind].green;
byte blue = cmap[ind].blue;
byte alpha = cmap[ind].alpha;
return blit_rgba (buf, count, red, green, blue, alpha);
}
static inline byte *
reverse_read_cmap (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte ind = *(*data)++;
byte red = cmap[ind].red;
byte green = cmap[ind].green;
byte blue = cmap[ind].blue;
byte alpha = cmap[ind].alpha;
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)++;
return blit_l (buf, count, lum);
}
static inline byte *
reverse_read_l (byte *buf, int count, byte **data, cmap_t *cmap)
{
byte lum = *(*data)++;
return reverse_blit_l (buf, count, lum);
}
static inline void
setup_pixrow_span (TargaHeader *targa, tex_t *tex, byte **_pixrow, int *_span,
int pixbytes)
{
byte *pixrow;
int span;
span = targa->width * pixbytes;
pixrow = tex->data;
if (targa->attributes & 0x10) {
// right to left
pixrow += span - pixbytes;
}
if (!(targa->attributes & 0x20)) {
// bottom to top
pixrow += (targa->height - 1) * span;
span = -span;
}
*_pixrow = pixrow;
*_span = span;
}
static byte *
skip_colormap (TargaHeader *targa, byte *data)
{
int bpe;
if (!targa->colormap_type)
return data;
Sys_DPrintf ("LoadTGA: skipping colormap\n");
bpe = (targa->pixel_size +7) / 8;
return data + bpe * targa->colormap_length;
}
static cmap_t *
parse_colormap (TargaHeader *targa, byte **dataByte)
{
byte *data;
cmap_t *cm, *cmap;
int i;
unsigned short word;
if (!targa->colormap_type)
Sys_Error ("LoadTGA: colormap missing");
if (targa->colormap_type != 1)
Sys_Error ("LoadTGA: unkown colormap type");
if (targa->colormap_index + targa->colormap_length > 256)
Sys_Error ("LoadTGA: unsupported color map size");
if (targa->pixel_size != 8)
Sys_Error ("LoadTGA: unsupported color map index bits");
switch (targa->colormap_size) {
case 32:
if (!targa->colormap_index && targa->colormap_length == 256) {
cmap = (cmap_t *) *dataByte;
*dataByte += 256 * sizeof (cmap_t);
return cmap;
}
case 24:
case 16:
case 15:
cmap = Hunk_AllocName (256 * sizeof (cmap_t), "TGA cmap");
break;
default:
Sys_Error ("LoadTGA: unsupported color map size");
break;
}
data = *dataByte;
cm = cmap + targa->colormap_index;
switch (targa->colormap_size) {
case 15:
for (i = 0; i < targa->colormap_length; i++, cm++) {
word = *data++;
word |= (*data++) << 8;
cm->red = (word << 3) & 0xf8;
cm->green = (word >> 2) & 0xf8;
cm->blue = (word >> 7) & 0xf8;
cm->alpha = 255;
}
break;
case 16:
for (i = 0; i < targa->colormap_length; i++, cm++) {
word = *data++;
word |= (*data++) << 8;
cm->red = (word << 3) & 0xf8;
cm->green = (word >> 2) & 0xf8;
cm->blue = (word >> 7) & 0xf8;
cm->alpha = (word & 0x8000) ? 255 : 0;
}
break;
case 24:
for (i = 0; i < targa->colormap_length; i++, cm++) {
cm->red = *data++;
cm->green = *data++;
cm->blue = *data++;
cm->alpha = 255;
}
break;
case 32:
for (i = 0; i < targa->colormap_length; i++, cm++) {
cm->red = *data++;
cm->green = *data++;
cm->blue = *data++;
cm->alpha = *data++;
}
break;
}
return cmap;
}
static void
decode_colormap (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
byte *pixcol, *pixrow;
cmap_t *cmap;
int column, columns, rows, span;
cmap = parse_colormap (targa, &dataByte);
tex->format = tex_rgba;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 4);
if (targa->attributes & 0x10) {
// right to left
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = reverse_read_cmap (pixcol, 1, &dataByte, cmap);
pixrow += span;
}
} else {
// left to right
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = read_cmap (pixcol, 1, &dataByte, cmap);
pixrow += span;
}
}
}
static void
decode_truecolor_24 (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
byte *pixcol, *pixrow;
int column, columns, rows, span;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 4);
if (targa->attributes & 0x10) {
// right to left
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = reverse_read_bgr (pixcol, 1, &dataByte, 0);
pixrow += span;
}
} else {
// left to right
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = read_bgr (pixcol, 1, &dataByte, 0);
pixrow += span;
}
}
}
static void
decode_truecolor_32 (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
byte *pixcol, *pixrow;
int column, columns, rows, span;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 4);
if (targa->attributes & 0x10) {
// right to left
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = reverse_read_bgra (pixcol, 1, &dataByte, 0);
pixrow += span;
}
} else {
// left to right
while (rows-- > 0) {
pixcol = pixrow;
for (column = columns; column > 0; column--)
pixcol = read_bgra (pixcol, 1, &dataByte, 0);
pixrow += span;
}
}
}
#define rle_expand(expand) \
do { \
unsigned char packetHeader, packetSize; \
while (rows-- > 0) { \
pixcol = pixrow; \
pixrow += span; \
for (column = columns; column > 0; ) { \
packetHeader = *dataByte++; \
packetSize = 1 + (packetHeader & 0x7f); \
while (packetSize > column) { \
int count = column; \
\
packetSize -= count; \
if (packetHeader & 0x80) { /* run-length packet */ \
expand (pixcol, count, &dataByte, cmap); \
} else { /* non run-length packet */ \
while (count--) \
expand (pixcol, 1, &dataByte, cmap); \
} \
column = columns; \
pixcol = pixrow; \
pixrow += span; \
if (rows-- <= 0) \
goto done_##expand; \
} \
column -= packetSize; \
if (packetHeader & 0x80) { /* run-length packet */ \
pixcol = expand (pixcol, packetSize, &dataByte, cmap); \
} else { /* non run-length packet */ \
while (packetSize--) \
pixcol = expand (pixcol, 1, &dataByte, cmap); \
} \
} \
} \
done_##expand:; \
} while (0)
static void
decode_colormap_rle (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
byte *pixcol, *pixrow;
cmap_t *cmap;
int column, columns, rows, span;
cmap = parse_colormap (targa, &dataByte);
tex->format = tex_rgba;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 4);
if (targa->attributes & 0x10) // right to left
rle_expand (reverse_read_cmap);
else // left to right
rle_expand (read_cmap);
}
static void
decode_truecolor_24_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
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 4);
if (targa->attributes & 0x10) // right to left
rle_expand (reverse_read_bgr);
else // left to right
rle_expand (read_bgr);
}
static void
decode_truecolor_32_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
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 4);
if (targa->attributes & 0x10) // right to left
rle_expand (reverse_read_bgra);
else // left to right
rle_expand (read_bgra);
}
static void
decode_truecolor (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
dataByte = skip_colormap (targa, dataByte);
switch (targa->pixel_size) {
case 24:
tex->format = tex_rgba; // image gets expadned to rgba
decode_truecolor_24 (targa, tex, dataByte);
break;
case 32:
tex->format = tex_rgba;
decode_truecolor_32 (targa, tex, dataByte);
break;
default:
Sys_Error ("LoadTGA: unsupported pixel size");
}
}
static void
decode_truecolor_rle (TargaHeader *targa, tex_t *tex, byte *dataByte)
{
dataByte = skip_colormap (targa, dataByte);
switch (targa->pixel_size) {
case 24:
tex->format = tex_rgba; // image gets expadned to rgba
decode_truecolor_24_rle (targa, tex, dataByte);
break;
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;
dataByte = skip_colormap (targa, dataByte);
if (targa->pixel_size != 8)
Sys_Error ("LoadTGA: unsupported truecolor pixel size");
tex->format = tex_l;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 1);
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
dataByte = skip_colormap (targa, dataByte);
if (targa->pixel_size != 8)
Sys_Error ("LoadTGA: unsupported truecolor pixel size");
tex->format = tex_l;
columns = targa->width;
rows = targa->height;
setup_pixrow_span (targa, tex, &pixrow, &span, 1);
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,
decode_greyscale,
0, 0, 0, 0, // 5-7 invalid
0, // 8 invalid
decode_colormap_rle,
decode_truecolor_rle,
decode_greyscale_rle,
0, 0, 0, 0, // 12-15 invalid
};
#define NUM_DECODERS (sizeof (decoder_functions) \
/ sizeof (decoder_functions[0]))
struct tex_s *
LoadTGA (QFile *fin)
{
byte *dataByte;
decoder_t decode;
int numPixels, targa_mark;
TargaHeader *targa;
tex_t *tex;
targa_mark = Hunk_LowMark ();
targa = Hunk_AllocName (qfs_filesize, "TGA");
Qread (fin, targa, qfs_filesize);
targa->colormap_index = LittleShort (targa->colormap_index);
targa->colormap_length = LittleShort (targa->colormap_length);
targa->x_origin = LittleShort (targa->x_origin);
targa->y_origin = LittleShort (targa->y_origin);
targa->width = LittleShort (targa->width);
targa->height = LittleShort (targa->height);
if (targa->image_type >= NUM_DECODERS
|| !(decode = decoder_functions[targa->image_type]))
Sys_Error ("LoadTGA: Unsupported targa type");
numPixels = targa->width * targa->height;
tex = Hunk_TempAlloc (field_offset (tex_t, data[numPixels * 4]));
tex->width = targa->width;
tex->height = targa->height;
tex->palette = 0;
// skip TARGA image comment
dataByte = (byte *) (targa + 1);
dataByte += targa->id_length;
decode (targa, tex, dataByte);
Hunk_FreeToLowMark (targa_mark);
return tex;
}
VISIBLE void
WriteTGAfile (const char *tganame, byte *data, int width, int height)
{
TargaHeader header;
memset (&header, 0, sizeof (header));
header.image_type = 2; // uncompressed type
header.width = LittleShort (width);
header.height = LittleShort (height);
header.pixel_size = 24;
QFS_WriteBuffers (tganame, 2, &header, sizeof (header), data,
width * height * 3);
}
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