quakeforge/libs/util/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
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include "QF/qendian.h"
#include "QF/sys.h"
#include "QF/tga.h"
#include "QF/vfs.h"
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static int
fgetLittleShort (VFile *f)
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{
byte b1, b2;
b1 = Qgetc (f);
b2 = Qgetc (f);
return (short) (b1 + b2 * 256);
}
/*
static int
fgetLittleLong (VFile *f)
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{
byte b1, b2, b3, b4;
b1 = Qgetc(f);
b2 = Qgetc(f);
b3 = Qgetc(f);
b4 = Qgetc(f);
return b1 + (b2<<8) + (b3<<16) + (b4<<24);
}
*/
byte *
LoadTGA (VFile *fin)
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{
int columns, rows, numPixels;
byte *pixbuf;
int row, column;
unsigned char red = 0, green = 0, blue = 0, alphabyte = 0;
TargaHeader targa_header;
byte *targa_rgba;
targa_header.id_length = Qgetc (fin);
targa_header.colormap_type = Qgetc (fin);
targa_header.image_type = Qgetc (fin);
targa_header.colormap_index = fgetLittleShort (fin);
targa_header.colormap_length = fgetLittleShort (fin);
targa_header.colormap_size = Qgetc (fin);
targa_header.x_origin = fgetLittleShort (fin);
targa_header.y_origin = fgetLittleShort (fin);
targa_header.width = fgetLittleShort (fin);
targa_header.height = fgetLittleShort (fin);
targa_header.pixel_size = Qgetc (fin);
targa_header.attributes = Qgetc (fin);
if (targa_header.image_type != 2 && targa_header.image_type != 10)
Sys_Error ("LoadTGA: Only type 2 and 10 targa RGB images supported\n");
if (targa_header.colormap_type != 0
|| (targa_header.pixel_size != 32 && targa_header.pixel_size != 24))
Sys_Error ("Texture_LoadTGA: Only 32 or 24 bit images supported "
"(no colormaps)\n");
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columns = targa_header.width;
rows = targa_header.height;
numPixels = columns * rows;
targa_rgba = malloc (numPixels * 4);
if (targa_header.id_length != 0)
Qseek (fin, targa_header.id_length, SEEK_CUR); // skip TARGA image
// comment
if (targa_header.image_type == 2) { // Uncompressed, RGB images
for (row = rows - 1; row >= 0; row--) {
pixbuf = targa_rgba + row * columns * 4;
for (column = 0; column < columns; column++) {
switch (targa_header.pixel_size) {
case 24:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
}
}
} else if (targa_header.image_type == 10) { // Runlength encoded RGB
// images
unsigned char packetHeader, packetSize, j;
for (row = rows - 1; row >= 0; row--) {
pixbuf = targa_rgba + row * columns * 4;
for (column = 0; column < columns;) {
packetHeader = Qgetc (fin);
packetSize = 1 + (packetHeader & 0x7f);
if (packetHeader & 0x80) { // run-length packet
switch (targa_header.pixel_size) {
case 24:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = 255;
break;
case 32:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = Qgetc (fin);
break;
}
for (j = 0; j < packetSize; j++) {
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
column++;
if (column == columns) { // run spans across rows
column = 0;
if (row > 0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row * columns * 4;
}
}
} else { // non run-length packet
for (j = 0; j < packetSize; j++) {
switch (targa_header.pixel_size) {
case 24:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = Qgetc (fin);
green = Qgetc (fin);
red = Qgetc (fin);
alphabyte = Qgetc (fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
column++;
if (column == columns) { // pixel packet run spans
// across rows
column = 0;
if (row > 0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row * columns * 4;
}
}
}
}
breakOut:;
}
}
Qclose (fin);
return targa_rgba;
}
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;
COM_WriteBuffers (tganame, 2, &header, sizeof (header), data,
width * height * 3);
}