mirror of https://github.com/FWGS/xash3d-fwgs
450 lines
11 KiB
C
450 lines
11 KiB
C
/*
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img_bmp.c - bmp format load & save
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Copyright (C) 2007 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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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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*/
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#include "imagelib.h"
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#include "xash3d_mathlib.h"
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#include "img_bmp.h"
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/*
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=============
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Image_LoadBMP
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=============
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*/
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qboolean Image_LoadBMP( const char *name, const byte *buffer, fs_offset_t filesize )
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{
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byte *buf_p, *pixbuf;
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rgba_t palette[256];
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int i, columns, column, rows, row, bpp = 1;
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int cbPalBytes = 0, padSize = 0, bps = 0;
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int reflectivity[3] = { 0, 0, 0 };
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qboolean load_qfont = false;
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bmp_t bhdr;
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fs_offset_t estimatedSize;
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if( filesize < sizeof( bhdr ))
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{
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Con_Reportf( S_ERROR "Image_LoadBMP: %s have incorrect file size %li should be greater than %li (header)\n", name, filesize, sizeof( bhdr ) );
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return false;
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}
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buf_p = (byte *)buffer;
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memcpy( &bhdr, buf_p, sizeof( bmp_t ));
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buf_p += sizeof( bmp_t );
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// bogus file header check
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if( bhdr.reserved0 != 0 ) return false;
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if( bhdr.planes != 1 ) return false;
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if( memcmp( bhdr.id, "BM", 2 ))
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{
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Con_DPrintf( S_ERROR "Image_LoadBMP: only Windows-style BMP files supported (%s)\n", name );
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return false;
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}
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if( bhdr.bitmapHeaderSize != 0x28 )
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{
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Con_DPrintf( S_ERROR "Image_LoadBMP: invalid header size %i\n", bhdr.bitmapHeaderSize );
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return false;
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}
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// bogus info header check
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if( bhdr.fileSize != filesize )
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{
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// Sweet Half-Life issues. splash.bmp have bogus filesize
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Con_Reportf( S_WARN "Image_LoadBMP: %s have incorrect file size %li should be %i\n", name, filesize, bhdr.fileSize );
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}
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// bogus compression? Only non-compressed supported.
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if( bhdr.compression != BI_RGB )
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{
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Con_DPrintf( S_ERROR "Image_LoadBMP: only uncompressed BMP files supported (%s)\n", name );
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return false;
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}
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image.width = columns = bhdr.width;
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image.height = rows = abs( bhdr.height );
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if( !Image_ValidSize( name ))
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return false;
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// special case for loading qfont (menu font)
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if( !Q_strncmp( name, "#XASH_SYSTEMFONT_001", 20 ))
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{
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// NOTE: same as system font we can use 4-bit bmps only
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// step1: move main layer into alpha-channel (give grayscale from RED channel)
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// step2: fill main layer with 255 255 255 color (white)
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// step3: ????
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// step4: PROFIT!!! (economy up to 150 kb for menu.dll final size)
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image.flags |= IMAGE_HAS_ALPHA;
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load_qfont = true;
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}
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if( bhdr.bitsPerPixel <= 8 )
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{
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// figure out how many entries are actually in the table
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if( bhdr.colors == 0 )
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{
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bhdr.colors = 256;
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cbPalBytes = ( 1 << bhdr.bitsPerPixel ) * sizeof( rgba_t );
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}
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else cbPalBytes = bhdr.colors * sizeof( rgba_t );
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}
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estimatedSize = ( buf_p - buffer ) + cbPalBytes;
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if( filesize < estimatedSize )
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{
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Con_Reportf( S_ERROR "Image_LoadBMP: %s have incorrect file size %li should be greater than %li (palette)\n", name, filesize, estimatedSize );
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return false;
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}
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memcpy( palette, buf_p, cbPalBytes );
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// setup gradient alpha for player decal
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if( !Q_strncmp( name, "#logo", 5 ))
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{
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for( i = 0; i < bhdr.colors; i++ )
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palette[i][3] = i;
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image.flags |= IMAGE_HAS_ALPHA;
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}
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if( Image_CheckFlag( IL_OVERVIEW ) && bhdr.bitsPerPixel == 8 )
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{
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// convert green background into alpha-layer, make opacity for all other entries
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for( i = 0; i < bhdr.colors; i++ )
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{
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if( palette[i][0] == 0 && palette[i][1] == 255 && palette[i][2] == 0 )
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{
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palette[i][0] = palette[i][1] = palette[i][2] = palette[i][3] = 0;
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image.flags |= IMAGE_HAS_ALPHA;
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}
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else palette[i][3] = 255;
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}
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}
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if( Image_CheckFlag( IL_KEEP_8BIT ) && bhdr.bitsPerPixel == 8 )
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{
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pixbuf = image.palette = Mem_Malloc( host.imagepool, 1024 );
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// bmp have a reversed palette colors
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for( i = 0; i < bhdr.colors; i++ )
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{
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*pixbuf++ = palette[i][2];
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*pixbuf++ = palette[i][1];
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*pixbuf++ = palette[i][0];
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*pixbuf++ = palette[i][3];
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}
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image.type = PF_INDEXED_32; // 32 bit palette
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}
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else
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{
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image.palette = NULL;
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image.type = PF_RGBA_32;
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bpp = 4;
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}
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buf_p += cbPalBytes;
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bps = image.width * (bhdr.bitsPerPixel >> 3);
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switch( bhdr.bitsPerPixel )
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{
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case 1:
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padSize = (( 32 - ( bhdr.width % 32 )) / 8 ) % 4;
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break;
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case 4:
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padSize = (( 8 - ( bhdr.width % 8 )) / 2 ) % 4;
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break;
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case 16:
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padSize = ( 4 - ( image.width * 2 % 4 )) % 4;
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break;
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case 8:
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case 24:
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padSize = ( 4 - ( bps % 4 )) % 4;
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break;
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}
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estimatedSize = ( buf_p - buffer ) + ( image.width + padSize ) * image.height * ( bhdr.bitsPerPixel >> 3 );
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if( filesize < estimatedSize )
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{
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if( image.palette )
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{
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Mem_Free( image.palette );
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image.palette = NULL;
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}
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Con_Reportf( S_ERROR "Image_LoadBMP: %s have incorrect file size %li should be greater than %li (pixels)\n", name, filesize, estimatedSize );
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return false;
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}
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image.size = image.width * image.height * bpp;
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image.rgba = Mem_Malloc( host.imagepool, image.size );
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for( row = rows - 1; row >= 0; row-- )
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{
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pixbuf = image.rgba + (row * columns * bpp);
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for( column = 0; column < columns; column++ )
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{
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byte red, green, blue, alpha;
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word shortPixel;
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int c, k, palIndex;
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switch( bhdr.bitsPerPixel )
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{
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case 1:
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alpha = *buf_p++;
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column--; // ingnore main iterations
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for( c = 0, k = 128; c < 8; c++, k >>= 1 )
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{
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red = green = blue = (!!(alpha & k) == 1 ? 0xFF : 0x00);
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 0x00;
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if( ++column == columns )
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break;
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}
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break;
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case 4:
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alpha = *buf_p++;
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palIndex = alpha >> 4;
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if( load_qfont )
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{
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*pixbuf++ = red = 255;
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*pixbuf++ = green = 255;
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*pixbuf++ = blue = 255;
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*pixbuf++ = palette[palIndex][2];
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}
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else
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{
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*pixbuf++ = red = palette[palIndex][2];
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*pixbuf++ = green = palette[palIndex][1];
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*pixbuf++ = blue = palette[palIndex][0];
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*pixbuf++ = palette[palIndex][3];
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}
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if( ++column == columns ) break;
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palIndex = alpha & 0x0F;
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if( load_qfont )
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{
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*pixbuf++ = red = 255;
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*pixbuf++ = green = 255;
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*pixbuf++ = blue = 255;
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*pixbuf++ = palette[palIndex][2];
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}
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else
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{
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*pixbuf++ = red = palette[palIndex][2];
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*pixbuf++ = green = palette[palIndex][1];
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*pixbuf++ = blue = palette[palIndex][0];
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*pixbuf++ = palette[palIndex][3];
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}
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break;
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case 8:
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palIndex = *buf_p++;
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red = palette[palIndex][2];
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green = palette[palIndex][1];
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blue = palette[palIndex][0];
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alpha = palette[palIndex][3];
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if( Image_CheckFlag( IL_KEEP_8BIT ))
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{
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*pixbuf++ = palIndex;
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}
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else
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{
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alpha;
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}
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break;
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case 16:
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shortPixel = *(word *)buf_p, buf_p += 2;
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*pixbuf++ = blue = (shortPixel & ( 31 << 10 )) >> 7;
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*pixbuf++ = green = (shortPixel & ( 31 << 5 )) >> 2;
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*pixbuf++ = red = (shortPixel & ( 31 )) << 3;
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*pixbuf++ = 0xff;
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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++ = 0xFF;
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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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alpha = *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++ = alpha;
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if( alpha != 255 ) image.flags |= IMAGE_HAS_ALPHA;
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break;
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default:
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Mem_Free( image.palette );
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Mem_Free( image.rgba );
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return false;
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}
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if( red != green || green != blue )
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image.flags |= IMAGE_HAS_COLOR;
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reflectivity[0] += red;
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reflectivity[1] += green;
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reflectivity[2] += blue;
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}
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buf_p += padSize; // actual only for 4-bit bmps
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}
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VectorDivide( reflectivity, ( image.width * image.height ), image.fogParams );
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if( image.palette ) Image_GetPaletteBMP( image.palette );
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image.depth = 1;
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return true;
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}
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qboolean Image_SaveBMP( const char *name, rgbdata_t *pix )
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{
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file_t *pfile = NULL;
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size_t total_size, cur_size;
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rgba_t rgrgbPalette[256];
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dword cbBmpBits;
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byte *clipbuf = NULL;
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byte *pb, *pbBmpBits;
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dword cbPalBytes;
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dword biTrueWidth;
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int pixel_size;
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int i, x, y;
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bmp_t hdr;
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if( FS_FileExists( name, false ) && !Image_CheckFlag( IL_ALLOW_OVERWRITE ) )
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return false; // already existed
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// bogus parameter check
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if( !pix->buffer )
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return false;
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// get image description
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switch( pix->type )
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{
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case PF_INDEXED_24:
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case PF_INDEXED_32:
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pixel_size = 1;
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break;
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case PF_RGB_24:
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pixel_size = 3;
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break;
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case PF_RGBA_32:
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pixel_size = 4;
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break;
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default:
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return false;
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}
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pfile = FS_Open( name, "wb", false );
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if( !pfile ) return false;
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// NOTE: align transparency column will sucessfully removed
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// after create sprite or lump image, it's just standard requiriments
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biTrueWidth = ((pix->width + 3) & ~3);
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cbBmpBits = biTrueWidth * pix->height * pixel_size;
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cbPalBytes = ( pixel_size == 1 ) ? 256 * sizeof( rgba_t ) : 0;
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// Bogus file header check
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hdr.id[0] = 'B';
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hdr.id[1] = 'M';
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hdr.fileSize = sizeof( hdr ) + cbBmpBits + cbPalBytes;
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hdr.reserved0 = 0;
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hdr.bitmapDataOffset = sizeof( hdr ) + cbPalBytes;
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hdr.bitmapHeaderSize = BI_SIZE;
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hdr.width = biTrueWidth;
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hdr.height = pix->height;
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hdr.planes = 1;
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hdr.bitsPerPixel = pixel_size * 8;
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hdr.compression = BI_RGB;
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hdr.bitmapDataSize = cbBmpBits;
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hdr.hRes = 0;
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hdr.vRes = 0;
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hdr.colors = ( pixel_size == 1 ) ? 256 : 0;
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hdr.importantColors = 0;
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FS_Write( pfile, &hdr, sizeof( bmp_t ));
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pbBmpBits = Mem_Malloc( host.imagepool, cbBmpBits );
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if( pixel_size == 1 )
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{
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pb = pix->palette;
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// copy over used entries
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for( i = 0; i < (int)hdr.colors; i++ )
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{
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rgrgbPalette[i][2] = *pb++;
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rgrgbPalette[i][1] = *pb++;
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rgrgbPalette[i][0] = *pb++;
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// bmp feature - can store 32-bit palette if present
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// some viewers e.g. fimg.exe can show alpha-chanell for it
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if( pix->type == PF_INDEXED_32 )
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rgrgbPalette[i][3] = *pb++;
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else rgrgbPalette[i][3] = 0;
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}
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// write palette
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FS_Write( pfile, rgrgbPalette, cbPalBytes );
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}
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pb = pix->buffer;
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for( y = 0; y < hdr.height; y++ )
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{
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i = (hdr.height - 1 - y ) * (hdr.width);
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for( x = 0; x < pix->width; x++ )
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{
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if( pixel_size == 1 )
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{
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// 8-bit
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pbBmpBits[i] = pb[x];
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}
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else
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{
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// 24 bit
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pbBmpBits[i*pixel_size+0] = pb[x*pixel_size+2];
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pbBmpBits[i*pixel_size+1] = pb[x*pixel_size+1];
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pbBmpBits[i*pixel_size+2] = pb[x*pixel_size+0];
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}
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if( pixel_size == 4 ) // write alpha channel
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pbBmpBits[i*pixel_size+3] = pb[x*pixel_size+3];
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i++;
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}
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pb += pix->width * pixel_size;
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}
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// write bitmap bits (remainder of file)
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FS_Write( pfile, pbBmpBits, cbBmpBits );
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FS_Close( pfile );
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Mem_Free( pbBmpBits );
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return true;
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}
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