/* =========================================================================== 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; union { byte *b; void *v; } buffer; 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, &buffer.v); if (!buffer.b || length < 0) { return; } if(length < 18) { ri.Error( ERR_DROP, "LoadTGA: header too short (%s)\n", name ); } buf_p = buffer.b; end = buffer.b + 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=0; row--) { pixbuf = targa_rgba + row*columns*4; for(column=0; column 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;j0) 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;j0) 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.v); }