mirror of
https://github.com/UberGames/lilium-voyager.git
synced 2024-11-10 06:31:47 +00:00
317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/*
|
|
===========================================================================
|
|
Copyright (C) 1999-2005 Id Software, Inc.
|
|
|
|
This file is part of Quake III Arena source code.
|
|
|
|
Quake III Arena source code 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.
|
|
|
|
Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
===========================================================================
|
|
*/
|
|
|
|
#include "tr_local.h"
|
|
|
|
/*
|
|
========================================================================
|
|
|
|
TGA files are used for 24/32 bit images
|
|
|
|
========================================================================
|
|
*/
|
|
|
|
typedef struct _TargaHeader {
|
|
unsigned char id_length, colormap_type, image_type;
|
|
unsigned short colormap_index, colormap_length;
|
|
unsigned char colormap_size;
|
|
unsigned short x_origin, y_origin, width, height;
|
|
unsigned char pixel_size, attributes;
|
|
} TargaHeader;
|
|
|
|
void R_LoadTGA ( const char *name, byte **pic, int *width, int *height)
|
|
{
|
|
unsigned columns, rows, numPixels;
|
|
byte *pixbuf;
|
|
int row, column;
|
|
byte *buf_p;
|
|
byte *end;
|
|
byte *buffer = NULL;
|
|
TargaHeader targa_header;
|
|
byte *targa_rgba;
|
|
int length;
|
|
|
|
*pic = NULL;
|
|
|
|
if(width)
|
|
*width = 0;
|
|
if(height)
|
|
*height = 0;
|
|
|
|
//
|
|
// load the file
|
|
//
|
|
length = ri.FS_ReadFile ( ( char * ) name, (void **)&buffer);
|
|
if (!buffer || length < 0) {
|
|
return;
|
|
}
|
|
|
|
if(length < 18)
|
|
{
|
|
ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name );
|
|
}
|
|
|
|
buf_p = buffer;
|
|
end = buffer + length;
|
|
|
|
targa_header.id_length = buf_p[0];
|
|
targa_header.colormap_type = buf_p[1];
|
|
targa_header.image_type = buf_p[2];
|
|
|
|
memcpy(&targa_header.colormap_index, &buf_p[3], 2);
|
|
memcpy(&targa_header.colormap_length, &buf_p[5], 2);
|
|
targa_header.colormap_size = buf_p[7];
|
|
memcpy(&targa_header.x_origin, &buf_p[8], 2);
|
|
memcpy(&targa_header.y_origin, &buf_p[10], 2);
|
|
memcpy(&targa_header.width, &buf_p[12], 2);
|
|
memcpy(&targa_header.height, &buf_p[14], 2);
|
|
targa_header.pixel_size = buf_p[16];
|
|
targa_header.attributes = buf_p[17];
|
|
|
|
targa_header.colormap_index = LittleShort(targa_header.colormap_index);
|
|
targa_header.colormap_length = LittleShort(targa_header.colormap_length);
|
|
targa_header.x_origin = LittleShort(targa_header.x_origin);
|
|
targa_header.y_origin = LittleShort(targa_header.y_origin);
|
|
targa_header.width = LittleShort(targa_header.width);
|
|
targa_header.height = LittleShort(targa_header.height);
|
|
|
|
buf_p += 18;
|
|
|
|
if (targa_header.image_type!=2
|
|
&& targa_header.image_type!=10
|
|
&& targa_header.image_type != 3 )
|
|
{
|
|
ri.Error (ERR_DROP, "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n");
|
|
}
|
|
|
|
if ( targa_header.colormap_type != 0 )
|
|
{
|
|
ri.Error( ERR_DROP, "LoadTGA: colormaps not supported\n" );
|
|
}
|
|
|
|
if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 ) && targa_header.image_type != 3 )
|
|
{
|
|
ri.Error (ERR_DROP, "LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
|
|
}
|
|
|
|
columns = targa_header.width;
|
|
rows = targa_header.height;
|
|
numPixels = columns * rows * 4;
|
|
|
|
if(!columns || !rows || numPixels > 0x7FFFFFFF || numPixels / columns / 4 != rows)
|
|
{
|
|
ri.Error (ERR_DROP, "LoadTGA: %s has an invalid image size\n", name);
|
|
}
|
|
|
|
|
|
targa_rgba = ri.Malloc (numPixels);
|
|
|
|
if (targa_header.id_length != 0)
|
|
{
|
|
if (buf_p + targa_header.id_length > end)
|
|
ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name );
|
|
|
|
buf_p += targa_header.id_length; // skip TARGA image comment
|
|
}
|
|
|
|
if ( targa_header.image_type==2 || targa_header.image_type == 3 )
|
|
{
|
|
if(buf_p + columns*rows*targa_header.pixel_size/8 > end)
|
|
{
|
|
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
|
|
}
|
|
|
|
// Uncompressed RGB or gray scale image
|
|
for(row=rows-1; row>=0; row--)
|
|
{
|
|
pixbuf = targa_rgba + row*columns*4;
|
|
for(column=0; column<columns; column++)
|
|
{
|
|
unsigned char red,green,blue,alphabyte;
|
|
switch (targa_header.pixel_size)
|
|
{
|
|
|
|
case 8:
|
|
blue = *buf_p++;
|
|
green = blue;
|
|
red = blue;
|
|
*pixbuf++ = red;
|
|
*pixbuf++ = green;
|
|
*pixbuf++ = blue;
|
|
*pixbuf++ = 255;
|
|
break;
|
|
|
|
case 24:
|
|
blue = *buf_p++;
|
|
green = *buf_p++;
|
|
red = *buf_p++;
|
|
*pixbuf++ = red;
|
|
*pixbuf++ = green;
|
|
*pixbuf++ = blue;
|
|
*pixbuf++ = 255;
|
|
break;
|
|
case 32:
|
|
blue = *buf_p++;
|
|
green = *buf_p++;
|
|
red = *buf_p++;
|
|
alphabyte = *buf_p++;
|
|
*pixbuf++ = red;
|
|
*pixbuf++ = green;
|
|
*pixbuf++ = blue;
|
|
*pixbuf++ = alphabyte;
|
|
break;
|
|
default:
|
|
ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (targa_header.image_type==10) { // Runlength encoded RGB images
|
|
unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
|
|
|
|
red = 0;
|
|
green = 0;
|
|
blue = 0;
|
|
alphabyte = 0xff;
|
|
|
|
for(row=rows-1; row>=0; row--) {
|
|
pixbuf = targa_rgba + row*columns*4;
|
|
for(column=0; column<columns; ) {
|
|
if(buf_p + 1 > end)
|
|
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
|
|
packetHeader= *buf_p++;
|
|
packetSize = 1 + (packetHeader & 0x7f);
|
|
if (packetHeader & 0x80) { // run-length packet
|
|
if(buf_p + targa_header.pixel_size/8 > end)
|
|
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
|
|
switch (targa_header.pixel_size) {
|
|
case 24:
|
|
blue = *buf_p++;
|
|
green = *buf_p++;
|
|
red = *buf_p++;
|
|
alphabyte = 255;
|
|
break;
|
|
case 32:
|
|
blue = *buf_p++;
|
|
green = *buf_p++;
|
|
red = *buf_p++;
|
|
alphabyte = *buf_p++;
|
|
break;
|
|
default:
|
|
ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
|
|
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
|
|
|
|
if(buf_p + targa_header.pixel_size/8*packetSize > end)
|
|
ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
|
|
for(j=0;j<packetSize;j++) {
|
|
switch (targa_header.pixel_size) {
|
|
case 24:
|
|
blue = *buf_p++;
|
|
green = *buf_p++;
|
|
red = *buf_p++;
|
|
*pixbuf++ = red;
|
|
*pixbuf++ = green;
|
|
*pixbuf++ = blue;
|
|
*pixbuf++ = 255;
|
|
break;
|
|
case 32:
|
|
blue = *buf_p++;
|
|
green = *buf_p++;
|
|
red = *buf_p++;
|
|
alphabyte = *buf_p++;
|
|
*pixbuf++ = red;
|
|
*pixbuf++ = green;
|
|
*pixbuf++ = blue;
|
|
*pixbuf++ = alphabyte;
|
|
break;
|
|
default:
|
|
ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
|
|
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:;
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
// TTimo: this is the chunk of code to ensure a behavior that meets TGA specs
|
|
// bit 5 set => top-down
|
|
if (targa_header.attributes & 0x20) {
|
|
unsigned char *flip = (unsigned char*)malloc (columns*4);
|
|
unsigned char *src, *dst;
|
|
|
|
for (row = 0; row < rows/2; row++) {
|
|
src = targa_rgba + row * 4 * columns;
|
|
dst = targa_rgba + (rows - row - 1) * 4 * columns;
|
|
|
|
memcpy (flip, src, columns*4);
|
|
memcpy (src, dst, columns*4);
|
|
memcpy (dst, flip, columns*4);
|
|
}
|
|
free (flip);
|
|
}
|
|
#endif
|
|
// instead we just print a warning
|
|
if (targa_header.attributes & 0x20) {
|
|
ri.Printf( PRINT_WARNING, "WARNING: '%s' TGA file header declares top-down image, ignoring\n", name);
|
|
}
|
|
|
|
if (width)
|
|
*width = columns;
|
|
if (height)
|
|
*height = rows;
|
|
|
|
*pic = targa_rgba;
|
|
|
|
ri.FS_FreeFile (buffer);
|
|
}
|