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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2013 Darklegion Development
This file is part of Tremulous.
Tremulous 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.
Tremulous 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 Tremulous; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "tr_common.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)", 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)", 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)", 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)", name );
}
if ( bmpHeader.fileSize != length )
{
ri.Error( ERR_DROP, "LoadBMP: header size does not match file size (%u vs. %u) (%s)", bmpHeader.fileSize, length, name );
}
if ( bmpHeader.compression != 0 )
{
ri.Error( ERR_DROP, "LoadBMP: only uncompressed BMP files supported (%s)", name );
}
if ( bmpHeader.bitsPerPixel < 8 )
{
ri.Error( ERR_DROP, "LoadBMP: monochrome and 4-bit BMP files not supported (%s)", 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'", 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", name);
}
if(buf_p + numPixels*bmpHeader.bitsPerPixel/8 > end)
{
ri.Error (ERR_DROP, "LoadBMP: file truncated (%s)", 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 );
}
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