Xash3D FWGS engine.
 
 
 
 

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/*
img_bmp.c - bmp format load & save
Copyright (C) 2007 Uncle Mike
This program 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 3 of the License, or
(at your option) any later version.
This program 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.
*/
#include "imagelib.h"
#include "xash3d_mathlib.h"
#include "img_bmp.h"
/*
=============
Image_LoadBMP
=============
*/
qboolean Image_LoadBMP( const char *name, const byte *buffer, fs_offset_t filesize )
{
byte *buf_p, *pixbuf;
rgba_t palette[256];
int i, columns, column, rows, row, bpp = 1;
int cbPalBytes = 0, padSize = 0, bps = 0;
int reflectivity[3] = { 0, 0, 0 };
qboolean load_qfont = false;
bmp_t bhdr;
fs_offset_t estimatedSize;
if( filesize < sizeof( bhdr ))
{
Con_Reportf( S_ERROR "Image_LoadBMP: %s have incorrect file size %li should be greater than %li (header)\n", name, filesize, sizeof( bhdr ) );
return false;
}
buf_p = (byte *)buffer;
memcpy( &bhdr, buf_p, sizeof( bmp_t ));
buf_p += BI_FILE_HEADER_SIZE + bhdr.bitmapHeaderSize;
// bogus file header check
if( bhdr.reserved0 != 0 ) return false;
if( bhdr.planes != 1 ) return false;
if( memcmp( bhdr.id, "BM", 2 ))
{
Con_DPrintf( S_ERROR "Image_LoadBMP: only Windows-style BMP files supported (%s)\n", name );
return false;
}
if(!( bhdr.bitmapHeaderSize == 40 || bhdr.bitmapHeaderSize == 108 || bhdr.bitmapHeaderSize == 124 ))
{
Con_DPrintf( S_ERROR "Image_LoadBMP: %s have non-standard header size %i\n", name, bhdr.bitmapHeaderSize );
return false;
}
// bogus info header check
if( bhdr.fileSize != filesize )
{
// Sweet Half-Life issues. splash.bmp have bogus filesize
Con_Reportf( S_WARN "Image_LoadBMP: %s have incorrect file size %li should be %i\n", name, filesize, bhdr.fileSize );
}
// bogus compression? Only non-compressed supported.
if( bhdr.compression != BI_RGB )
{
if( bhdr.bitsPerPixel != 32 || bhdr.compression != BI_BITFIELDS )
{
Con_DPrintf( S_ERROR "Image_LoadBMP: only uncompressed BMP files supported (%s)\n", name );
return false;
}
}
image.width = columns = bhdr.width;
image.height = rows = abs( bhdr.height );
if( !Image_ValidSize( name ))
return false;
// special case for loading qfont (menu font)
if( !Q_strncmp( name, "#XASH_SYSTEMFONT_001", 20 ))
{
// NOTE: same as system font we can use 4-bit bmps only
// step1: move main layer into alpha-channel (give grayscale from RED channel)
// step2: fill main layer with 255 255 255 color (white)
// step3: ????
// step4: PROFIT!!! (economy up to 150 kb for menu.dll final size)
image.flags |= IMAGE_HAS_ALPHA;
load_qfont = true;
}
if( bhdr.bitsPerPixel <= 8 )
{
// figure out how many entries are actually in the table
if( bhdr.colors == 0 )
{
bhdr.colors = 256;
cbPalBytes = ( 1 << bhdr.bitsPerPixel ) * sizeof( rgba_t );
}
else cbPalBytes = bhdr.colors * sizeof( rgba_t );
}
estimatedSize = ( buf_p - buffer ) + cbPalBytes;
if( filesize < estimatedSize )
{
Con_Reportf( S_ERROR "Image_LoadBMP: %s have incorrect file size %li should be greater than %li (palette)\n", name, filesize, estimatedSize );
return false;
}
memcpy( palette, buf_p, cbPalBytes );
// setup gradient alpha for player decal
if( !Q_strncmp( name, "#logo", 5 ))
{
for( i = 0; i < bhdr.colors; i++ )
palette[i][3] = i;
image.flags |= IMAGE_HAS_ALPHA;
}
if( Image_CheckFlag( IL_OVERVIEW ) && bhdr.bitsPerPixel == 8 )
{
// convert green background into alpha-layer, make opacity for all other entries
for( i = 0; i < bhdr.colors; i++ )
{
if( palette[i][0] == 0 && palette[i][1] == 255 && palette[i][2] == 0 )
{
palette[i][0] = palette[i][1] = palette[i][2] = palette[i][3] = 0;
image.flags |= IMAGE_HAS_ALPHA;
}
else palette[i][3] = 255;
}
}
if( Image_CheckFlag( IL_KEEP_8BIT ) && bhdr.bitsPerPixel == 8 )
{
pixbuf = image.palette = Mem_Malloc( host.imagepool, 1024 );
// bmp have a reversed palette colors
for( i = 0; i < bhdr.colors; i++ )
{
*pixbuf++ = palette[i][2];
*pixbuf++ = palette[i][1];
*pixbuf++ = palette[i][0];
*pixbuf++ = palette[i][3];
}
image.type = PF_INDEXED_32; // 32 bit palette
}
else
{
image.palette = NULL;
image.type = PF_RGBA_32;
bpp = 4;
}
buf_p += cbPalBytes;
bps = image.width * (bhdr.bitsPerPixel >> 3);
switch( bhdr.bitsPerPixel )
{
case 1:
padSize = (( 32 - ( bhdr.width % 32 )) / 8 ) % 4;
break;
case 4:
padSize = (( 8 - ( bhdr.width % 8 )) / 2 ) % 4;
break;
case 16:
padSize = ( 4 - ( image.width * 2 % 4 )) % 4;
break;
case 8:
case 24:
padSize = ( 4 - ( bps % 4 )) % 4;
break;
}
estimatedSize = ( buf_p - buffer ) + image.width * image.height * ( bhdr.bitsPerPixel >> 3 );
if( filesize < estimatedSize )
{
if( image.palette )
{
Mem_Free( image.palette );
image.palette = NULL;
}
Con_Reportf( S_ERROR "Image_LoadBMP: %s have incorrect file size %li should be greater than %li (pixels)\n", name, filesize, estimatedSize );
return false;
}
image.depth = 1;
image.size = image.width * image.height * bpp;
image.rgba = Mem_Malloc( host.imagepool, image.size );
for( row = rows - 1; row >= 0; row-- )
{
pixbuf = image.rgba + (row * columns * bpp);
for( column = 0; column < columns; column++ )
{
byte red, green, blue, alpha;
word shortPixel;
int c, k, palIndex;
switch( bhdr.bitsPerPixel )
{
case 1:
alpha = *buf_p++;
column--; // ingnore main iterations
for( c = 0, k = 128; c < 8; c++, k >>= 1 )
{
red = green = blue = (!!(alpha & k) == 1 ? 0xFF : 0x00);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 0x00;
if( ++column == columns )
break;
}
break;
case 4:
alpha = *buf_p++;
palIndex = alpha >> 4;
if( load_qfont )
{
*pixbuf++ = red = 255;
*pixbuf++ = green = 255;
*pixbuf++ = blue = 255;
*pixbuf++ = palette[palIndex][2];
}
else
{
*pixbuf++ = red = palette[palIndex][2];
*pixbuf++ = green = palette[palIndex][1];
*pixbuf++ = blue = palette[palIndex][0];
*pixbuf++ = palette[palIndex][3];
}
if( ++column == columns ) break;
palIndex = alpha & 0x0F;
if( load_qfont )
{
*pixbuf++ = red = 255;
*pixbuf++ = green = 255;
*pixbuf++ = blue = 255;
*pixbuf++ = palette[palIndex][2];
}
else
{
*pixbuf++ = red = palette[palIndex][2];
*pixbuf++ = green = palette[palIndex][1];
*pixbuf++ = blue = palette[palIndex][0];
*pixbuf++ = palette[palIndex][3];
}
break;
case 8:
palIndex = *buf_p++;
red = palette[palIndex][2];
green = palette[palIndex][1];
blue = palette[palIndex][0];
alpha = palette[palIndex][3];
if( Image_CheckFlag( IL_KEEP_8BIT ))
{
*pixbuf++ = palIndex;
}
else
{
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alpha;
}
break;
case 16:
shortPixel = *(word *)buf_p, buf_p += 2;
*pixbuf++ = blue = (shortPixel & ( 31 << 10 )) >> 7;
*pixbuf++ = green = (shortPixel & ( 31 << 5 )) >> 2;
*pixbuf++ = red = (shortPixel & ( 31 )) << 3;
*pixbuf++ = 0xff;
break;
case 24:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 0xFF;
break;
case 32:
blue = *buf_p++;
green = *buf_p++;
red = *buf_p++;
alpha = *buf_p++;
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alpha;
if( alpha != 255 ) image.flags |= IMAGE_HAS_ALPHA;
break;
default:
Mem_Free( image.palette );
Mem_Free( image.rgba );
return false;
}
if( red != green || green != blue )
image.flags |= IMAGE_HAS_COLOR;
reflectivity[0] += red;
reflectivity[1] += green;
reflectivity[2] += blue;
}
buf_p += padSize; // actual only for 4-bit bmps
}
VectorDivide( reflectivity, ( image.width * image.height ), image.fogParams );
if( image.palette )
Image_GetPaletteBMP( image.palette );
return true;
}
qboolean Image_SaveBMP( const char *name, rgbdata_t *pix )
{
file_t *pfile = NULL;
size_t total_size, cur_size;
rgba_t rgrgbPalette[256];
dword cbBmpBits;
byte *clipbuf = NULL;
byte *pb, *pbBmpBits;
dword cbPalBytes;
dword biTrueWidth;
int pixel_size;
int i, x, y;
bmp_t hdr;
if( FS_FileExists( name, false ) && !Image_CheckFlag( IL_ALLOW_OVERWRITE ) )
return false; // already existed
// bogus parameter check
if( !pix->buffer )
return false;
// get image description
switch( pix->type )
{
case PF_INDEXED_24:
case PF_INDEXED_32:
pixel_size = 1;
break;
case PF_RGB_24:
pixel_size = 3;
break;
case PF_RGBA_32:
pixel_size = 4;
break;
default:
return false;
}
pfile = FS_Open( name, "wb", false );
if( !pfile ) return false;
// NOTE: align transparency column will sucessfully removed
// after create sprite or lump image, it's just standard requiriments
biTrueWidth = ((pix->width + 3) & ~3);
cbBmpBits = biTrueWidth * pix->height * pixel_size;
cbPalBytes = ( pixel_size == 1 ) ? 256 * sizeof( rgba_t ) : 0;
// Bogus file header check
hdr.id[0] = 'B';
hdr.id[1] = 'M';
hdr.fileSize = sizeof( hdr ) + cbBmpBits + cbPalBytes;
hdr.reserved0 = 0;
hdr.bitmapDataOffset = sizeof( hdr ) + cbPalBytes;
hdr.bitmapHeaderSize = BI_SIZE;
hdr.width = biTrueWidth;
hdr.height = pix->height;
hdr.planes = 1;
hdr.bitsPerPixel = pixel_size * 8;
hdr.compression = BI_RGB;
hdr.bitmapDataSize = cbBmpBits;
hdr.hRes = 0;
hdr.vRes = 0;
hdr.colors = ( pixel_size == 1 ) ? 256 : 0;
hdr.importantColors = 0;
FS_Write( pfile, &hdr, sizeof( bmp_t ));
pbBmpBits = Mem_Malloc( host.imagepool, cbBmpBits );
if( pixel_size == 1 )
{
pb = pix->palette;
// copy over used entries
for( i = 0; i < (int)hdr.colors; i++ )
{
rgrgbPalette[i][2] = *pb++;
rgrgbPalette[i][1] = *pb++;
rgrgbPalette[i][0] = *pb++;
// bmp feature - can store 32-bit palette if present
// some viewers e.g. fimg.exe can show alpha-chanell for it
if( pix->type == PF_INDEXED_32 )
rgrgbPalette[i][3] = *pb++;
else rgrgbPalette[i][3] = 0;
}
// write palette
FS_Write( pfile, rgrgbPalette, cbPalBytes );
}
pb = pix->buffer;
for( y = 0; y < hdr.height; y++ )
{
i = (hdr.height - 1 - y ) * (hdr.width);
for( x = 0; x < pix->width; x++ )
{
if( pixel_size == 1 )
{
// 8-bit
pbBmpBits[i] = pb[x];
}
else
{
// 24 bit
pbBmpBits[i*pixel_size+0] = pb[x*pixel_size+2];
pbBmpBits[i*pixel_size+1] = pb[x*pixel_size+1];
pbBmpBits[i*pixel_size+2] = pb[x*pixel_size+0];
}
if( pixel_size == 4 ) // write alpha channel
pbBmpBits[i*pixel_size+3] = pb[x*pixel_size+3];
i++;
}
pb += pix->width * pixel_size;
}
// write bitmap bits (remainder of file)
FS_Write( pfile, pbBmpBits, cbBmpBits );
FS_Close( pfile );
Mem_Free( pbBmpBits );
return true;
}