mirror of
https://github.com/ioquake/ioq3.git
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317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "tr_local.h"
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/*
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========================================================================
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TGA files are used for 24/32 bit images
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========================================================================
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*/
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typedef struct _TargaHeader {
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unsigned char id_length, colormap_type, image_type;
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unsigned short colormap_index, colormap_length;
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unsigned char colormap_size;
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unsigned short x_origin, y_origin, width, height;
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unsigned char pixel_size, attributes;
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} TargaHeader;
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void LoadTGA ( const char *name, byte **pic, int *width, int *height)
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{
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unsigned columns, rows, numPixels;
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byte *pixbuf;
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int row, column;
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byte *buf_p;
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byte *end;
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byte *buffer = NULL;
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TargaHeader targa_header;
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byte *targa_rgba;
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int length;
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*pic = NULL;
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if(width)
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*width = 0;
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if(height)
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*height = 0;
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//
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// load the file
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//
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length = ri.FS_ReadFile ( ( char * ) name, (void **)&buffer);
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if (!buffer || length < 0) {
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return;
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}
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if(length < 18)
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{
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ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name );
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}
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buf_p = buffer;
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end = buffer + length;
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targa_header.id_length = buf_p[0];
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targa_header.colormap_type = buf_p[1];
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targa_header.image_type = buf_p[2];
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memcpy(&targa_header.colormap_index, &buf_p[3], 2);
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memcpy(&targa_header.colormap_length, &buf_p[5], 2);
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targa_header.colormap_size = buf_p[7];
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memcpy(&targa_header.x_origin, &buf_p[8], 2);
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memcpy(&targa_header.y_origin, &buf_p[10], 2);
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memcpy(&targa_header.width, &buf_p[12], 2);
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memcpy(&targa_header.height, &buf_p[14], 2);
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targa_header.pixel_size = buf_p[16];
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targa_header.attributes = buf_p[17];
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targa_header.colormap_index = LittleShort(targa_header.colormap_index);
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targa_header.colormap_length = LittleShort(targa_header.colormap_length);
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targa_header.x_origin = LittleShort(targa_header.x_origin);
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targa_header.y_origin = LittleShort(targa_header.y_origin);
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targa_header.width = LittleShort(targa_header.width);
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targa_header.height = LittleShort(targa_header.height);
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buf_p += 18;
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if (targa_header.image_type!=2
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&& targa_header.image_type!=10
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&& targa_header.image_type != 3 )
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{
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ri.Error (ERR_DROP, "LoadTGA: Only type 2 (RGB), 3 (gray), and 10 (RGB) TGA images supported\n");
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}
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if ( targa_header.colormap_type != 0 )
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{
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ri.Error( ERR_DROP, "LoadTGA: colormaps not supported\n" );
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}
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if ( ( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 ) && targa_header.image_type != 3 )
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{
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ri.Error (ERR_DROP, "LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
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}
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columns = targa_header.width;
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rows = targa_header.height;
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numPixels = columns * rows * 4;
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if(!columns || !rows || numPixels > 0x7FFFFFFF || numPixels / columns / 4 != rows)
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{
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ri.Error (ERR_DROP, "LoadTGA: %s has an invalid image size\n", name);
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}
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targa_rgba = ri.Malloc (numPixels);
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if (targa_header.id_length != 0)
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{
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if (buf_p + targa_header.id_length > end)
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ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name );
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buf_p += targa_header.id_length; // skip TARGA image comment
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}
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if ( targa_header.image_type==2 || targa_header.image_type == 3 )
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{
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if(buf_p + columns*rows*targa_header.pixel_size/8 > end)
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{
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ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
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}
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// Uncompressed RGB or gray scale image
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for(row=rows-1; row>=0; row--)
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{
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pixbuf = targa_rgba + row*columns*4;
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for(column=0; column<columns; column++)
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{
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unsigned char red,green,blue,alphabyte;
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switch (targa_header.pixel_size)
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{
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case 8:
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blue = *buf_p++;
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green = blue;
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red = blue;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 24:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 32:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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break;
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default:
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ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
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break;
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}
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}
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}
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}
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else if (targa_header.image_type==10) { // Runlength encoded RGB images
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unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
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red = 0;
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green = 0;
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blue = 0;
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alphabyte = 0xff;
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for(row=rows-1; row>=0; row--) {
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pixbuf = targa_rgba + row*columns*4;
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for(column=0; column<columns; ) {
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if(buf_p + 1 > end)
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ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
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packetHeader= *buf_p++;
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packetSize = 1 + (packetHeader & 0x7f);
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if (packetHeader & 0x80) { // run-length packet
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if(buf_p + targa_header.pixel_size/8 > end)
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ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
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switch (targa_header.pixel_size) {
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case 24:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = 255;
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break;
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case 32:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = *buf_p++;
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break;
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default:
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ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
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break;
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}
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for(j=0;j<packetSize;j++) {
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*pixbuf++=red;
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*pixbuf++=green;
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*pixbuf++=blue;
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*pixbuf++=alphabyte;
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column++;
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if (column==columns) { // run spans across rows
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column=0;
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if (row>0)
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row--;
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else
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goto breakOut;
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pixbuf = targa_rgba + row*columns*4;
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}
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}
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}
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else { // non run-length packet
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if(buf_p + targa_header.pixel_size/8*packetSize > end)
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ri.Error (ERR_DROP, "LoadTGA: file truncated (%s)\n", name);
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for(j=0;j<packetSize;j++) {
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switch (targa_header.pixel_size) {
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case 24:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 32:
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blue = *buf_p++;
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green = *buf_p++;
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red = *buf_p++;
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alphabyte = *buf_p++;
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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break;
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default:
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ri.Error( ERR_DROP, "LoadTGA: illegal pixel_size '%d' in file '%s'\n", targa_header.pixel_size, name );
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break;
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}
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column++;
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if (column==columns) { // pixel packet run spans across rows
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column=0;
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if (row>0)
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row--;
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else
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goto breakOut;
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pixbuf = targa_rgba + row*columns*4;
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}
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}
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}
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}
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breakOut:;
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}
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}
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#if 0
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// TTimo: this is the chunk of code to ensure a behavior that meets TGA specs
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// bit 5 set => top-down
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if (targa_header.attributes & 0x20) {
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unsigned char *flip = (unsigned char*)malloc (columns*4);
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unsigned char *src, *dst;
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for (row = 0; row < rows/2; row++) {
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src = targa_rgba + row * 4 * columns;
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dst = targa_rgba + (rows - row - 1) * 4 * columns;
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memcpy (flip, src, columns*4);
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memcpy (src, dst, columns*4);
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memcpy (dst, flip, columns*4);
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}
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free (flip);
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}
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#endif
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// instead we just print a warning
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if (targa_header.attributes & 0x20) {
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ri.Printf( PRINT_WARNING, "WARNING: '%s' TGA file header declares top-down image, ignoring\n", name);
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}
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if (width)
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*width = columns;
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if (height)
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*height = rows;
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*pic = targa_rgba;
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ri.FS_FreeFile (buffer);
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}
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