diff options
Diffstat (limited to 'code/renderer/tr_image_bmp.c')
| -rw-r--r-- | code/renderer/tr_image_bmp.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/code/renderer/tr_image_bmp.c b/code/renderer/tr_image_bmp.c new file mode 100644 index 0000000..0b78abb --- /dev/null +++ b/code/renderer/tr_image_bmp.c @@ -0,0 +1,239 @@ +/* +=========================================================================== +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" + +typedef struct +{ + char id[2]; + unsigned fileSize; + unsigned reserved0; + unsigned bitmapDataOffset; + unsigned bitmapHeaderSize; + unsigned width; + unsigned height; + unsigned short planes; + unsigned short bitsPerPixel; + unsigned compression; + unsigned bitmapDataSize; + unsigned hRes; + unsigned vRes; + unsigned colors; + unsigned importantColors; + unsigned char palette[256][4]; +} BMPHeader_t; + +void R_LoadBMP( const char *name, byte **pic, int *width, int *height ) +{ + int columns, rows; + unsigned numPixels; + byte *pixbuf; + int row, column; + byte *buf_p; + byte *end; + union { + byte *b; + void *v; + } buffer; + int length; + BMPHeader_t bmpHeader; + byte *bmpRGBA; + + *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 < 54) + { + ri.Error( ERR_DROP, "LoadBMP: header too short (%s)\n", name ); + } + + buf_p = buffer.b; + end = buffer.b + length; + + bmpHeader.id[0] = *buf_p++; + bmpHeader.id[1] = *buf_p++; + bmpHeader.fileSize = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.reserved0 = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.bitmapDataOffset = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.bitmapHeaderSize = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.width = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.height = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.planes = LittleShort( * ( short * ) buf_p ); + buf_p += 2; + bmpHeader.bitsPerPixel = LittleShort( * ( short * ) buf_p ); + buf_p += 2; + bmpHeader.compression = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.bitmapDataSize = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.hRes = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.vRes = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.colors = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + bmpHeader.importantColors = LittleLong( * ( int * ) buf_p ); + buf_p += 4; + + if ( bmpHeader.bitsPerPixel == 8 ) + { + if (buf_p + sizeof(bmpHeader.palette) > end) + ri.Error( ERR_DROP, "LoadBMP: header too short (%s)\n", name ); + + Com_Memcpy( bmpHeader.palette, buf_p, sizeof( bmpHeader.palette ) ); + buf_p += sizeof(bmpHeader.palette); + } + + if (buffer.b + bmpHeader.bitmapDataOffset > end) + { + ri.Error( ERR_DROP, "LoadBMP: invalid offset value in header (%s)\n", name ); + } + + buf_p = buffer.b + bmpHeader.bitmapDataOffset; + + if ( bmpHeader.id[0] != 'B' && bmpHeader.id[1] != 'M' ) + { + ri.Error( ERR_DROP, "LoadBMP: only Windows-style BMP files supported (%s)\n", name ); + } + if ( bmpHeader.fileSize != length ) + { + ri.Error( ERR_DROP, "LoadBMP: header size does not match file size (%u vs. %u) (%s)\n", bmpHeader.fileSize, length, name ); + } + if ( bmpHeader.compression != 0 ) + { + ri.Error( ERR_DROP, "LoadBMP: only uncompressed BMP files supported (%s)\n", name ); + } + if ( bmpHeader.bitsPerPixel < 8 ) + { + ri.Error( ERR_DROP, "LoadBMP: monochrome and 4-bit BMP files not supported (%s)\n", name ); + } + + switch ( bmpHeader.bitsPerPixel ) + { + case 8: + case 16: + case 24: + case 32: + break; + default: + ri.Error( ERR_DROP, "LoadBMP: illegal pixel_size '%hu' in file '%s'\n", bmpHeader.bitsPerPixel, name ); + break; + } + + columns = bmpHeader.width; + rows = bmpHeader.height; + if ( rows < 0 ) + rows = -rows; + numPixels = columns * rows; + + if(columns <= 0 || !rows || numPixels > 0x1FFFFFFF // 4*1FFFFFFF == 0x7FFFFFFC < 0x7FFFFFFF + || ((numPixels * 4) / columns) / 4 != rows) + { + ri.Error (ERR_DROP, "LoadBMP: %s has an invalid image size\n", name); + } + if(buf_p + numPixels*bmpHeader.bitsPerPixel/8 > end) + { + ri.Error (ERR_DROP, "LoadBMP: file truncated (%s)\n", name); + } + + if ( width ) + *width = columns; + if ( height ) + *height = rows; + + bmpRGBA = ri.Malloc( numPixels * 4 ); + *pic = bmpRGBA; + + + for ( row = rows-1; row >= 0; row-- ) + { + pixbuf = bmpRGBA + row*columns*4; + + for ( column = 0; column < columns; column++ ) + { + unsigned char red, green, blue, alpha; + int palIndex; + unsigned short shortPixel; + + switch ( bmpHeader.bitsPerPixel ) + { + case 8: + palIndex = *buf_p++; + *pixbuf++ = bmpHeader.palette[palIndex][2]; + *pixbuf++ = bmpHeader.palette[palIndex][1]; + *pixbuf++ = bmpHeader.palette[palIndex][0]; + *pixbuf++ = 0xff; + break; + case 16: + shortPixel = * ( unsigned short * ) pixbuf; + pixbuf += 2; + *pixbuf++ = ( shortPixel & ( 31 << 10 ) ) >> 7; + *pixbuf++ = ( shortPixel & ( 31 << 5 ) ) >> 2; + *pixbuf++ = ( shortPixel & ( 31 ) ) << 3; + *pixbuf++ = 0xff; + 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++; + alpha = *buf_p++; + *pixbuf++ = red; + *pixbuf++ = green; + *pixbuf++ = blue; + *pixbuf++ = alpha; + break; + } + } + } + + ri.FS_FreeFile( buffer.v ); + +} |