300 lines
8.2 KiB
C
300 lines
8.2 KiB
C
/*
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img_tga.c - tga 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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/*
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=============
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Image_LoadTGA
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=============
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*/
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qboolean Image_LoadTGA( const char *name, const byte *buffer, size_t filesize )
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{
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int i, columns, rows, row_inc, row, col;
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byte *buf_p, *pixbuf, *targa_rgba;
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byte palette[256][4], red = 0, green = 0, blue = 0, alpha = 0;
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int readpixelcount, pixelcount;
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qboolean compressed;
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tga_t targa_header;
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if( filesize < sizeof( tga_t ))
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return false;
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buf_p = (byte *)buffer;
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targa_header.id_length = *buf_p++;
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targa_header.colormap_type = *buf_p++;
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targa_header.image_type = *buf_p++;
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targa_header.colormap_index = buf_p[0] + buf_p[1] * 256; buf_p += 2;
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targa_header.colormap_length = buf_p[0] + buf_p[1] * 256; buf_p += 2;
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targa_header.colormap_size = *buf_p; buf_p += 1;
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targa_header.x_origin = *(short *)buf_p; buf_p += 2;
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targa_header.y_origin = *(short *)buf_p; buf_p += 2;
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targa_header.width = image.width = *(short *)buf_p; buf_p += 2;
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targa_header.height = image.height = *(short *)buf_p; buf_p += 2;
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targa_header.pixel_size = *buf_p++;
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targa_header.attributes = *buf_p++;
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if( targa_header.id_length != 0 ) buf_p += targa_header.id_length; // skip TARGA image comment
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// check for tga file
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if( !Image_ValidSize( name )) return false;
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image.type = PF_RGBA_32; // always exctracted to 32-bit buffer
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if( targa_header.image_type == 1 || targa_header.image_type == 9 )
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{
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// uncompressed colormapped image
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if( targa_header.pixel_size != 8 )
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{
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MsgDev( D_WARN, "Image_LoadTGA: (%s) Only 8 bit images supported for type 1 and 9\n", name );
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return false;
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}
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if( targa_header.colormap_length != 256 )
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{
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MsgDev( D_WARN, "Image_LoadTGA: (%s) Only 8 bit colormaps are supported for type 1 and 9\n", name );
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return false;
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}
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if( targa_header.colormap_index )
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{
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MsgDev( D_WARN, "Image_LoadTGA: (%s) colormap_index is not supported for type 1 and 9\n", name );
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return false;
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}
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if( targa_header.colormap_size == 24 )
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{
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for( i = 0; i < targa_header.colormap_length; i++ )
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{
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palette[i][2] = *buf_p++;
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palette[i][1] = *buf_p++;
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palette[i][0] = *buf_p++;
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palette[i][3] = 255;
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}
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}
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else if( targa_header.colormap_size == 32 )
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{
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for( i = 0; i < targa_header.colormap_length; i++ )
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{
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palette[i][2] = *buf_p++;
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palette[i][1] = *buf_p++;
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palette[i][0] = *buf_p++;
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palette[i][3] = *buf_p++;
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}
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}
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else
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{
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MsgDev( D_WARN, "Image_LoadTGA: (%s) only 24 and 32 bit colormaps are supported for type 1 and 9\n", name );
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return false;
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}
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}
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else if( targa_header.image_type == 2 || targa_header.image_type == 10 )
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{
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// uncompressed or RLE compressed RGB
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if( targa_header.pixel_size != 32 && targa_header.pixel_size != 24 )
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{
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MsgDev( D_WARN, "Image_LoadTGA: (%s) Only 32 or 24 bit images supported for type 2 and 10\n", name );
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return false;
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}
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}
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else if( targa_header.image_type == 3 || targa_header.image_type == 11 )
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{
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// uncompressed greyscale
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if( targa_header.pixel_size != 8 )
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{
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MsgDev( D_WARN, "Image_LoadTGA: (%s) Only 8 bit images supported for type 3 and 11\n", name );
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return false;
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}
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}
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// HACKHACK: detect luma textures by name
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if( Q_stristr( name, "_luma" )) image.flags |= IMAGE_HAS_LUMA;
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columns = targa_header.width;
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rows = targa_header.height;
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image.size = image.width * image.height * 4;
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targa_rgba = image.rgba = Mem_Alloc( host.imagepool, image.size );
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// if bit 5 of attributes isn't set, the image has been stored from bottom to top
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if( !Image_CheckFlag( IL_DONTFLIP_TGA ) && targa_header.attributes & 0x20 )
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{
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pixbuf = targa_rgba;
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row_inc = 0;
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}
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else
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{
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pixbuf = targa_rgba + ( rows - 1 ) * columns * 4;
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row_inc = -columns * 4 * 2;
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}
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compressed = ( targa_header.image_type == 9 || targa_header.image_type == 10 || targa_header.image_type == 11 );
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for( row = col = 0; row < rows; )
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{
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pixelcount = 0x10000;
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readpixelcount = 0x10000;
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if( compressed )
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{
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pixelcount = *buf_p++;
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if( pixelcount & 0x80 ) // run-length packet
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readpixelcount = 1;
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pixelcount = 1 + ( pixelcount & 0x7f );
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}
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while( pixelcount-- && ( row < rows ) )
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{
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if( readpixelcount-- > 0 )
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{
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switch( targa_header.image_type )
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{
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case 1:
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case 9:
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// colormapped image
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blue = *buf_p++;
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red = palette[blue][0];
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green = palette[blue][1];
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alpha = palette[blue][3];
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blue = palette[blue][2];
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if( alpha != 255 ) image.flags |= IMAGE_HAS_ALPHA;
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break;
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case 2:
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case 10:
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// 24 or 32 bit image
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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 = 255;
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if( targa_header.pixel_size == 32 )
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{
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alpha = *buf_p++;
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if( alpha != 255 )
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image.flags |= IMAGE_HAS_ALPHA;
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}
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break;
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case 3:
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case 11:
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// greyscale image
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blue = green = red = *buf_p++;
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alpha = 255;
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break;
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}
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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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*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( ++col == columns )
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{
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// run spans across rows
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row++;
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col = 0;
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pixbuf += row_inc;
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}
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}
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}
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return true;
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}
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/*
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=============
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Image_SaveTGA
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=============
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*/
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qboolean Image_SaveTGA( const char *name, rgbdata_t *pix )
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{
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int y, outsize, pixel_size;
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const byte *bufend, *in;
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byte *buffer, *out;
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const char *comment = "Generated by Xash ImageLib\0";
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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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if( pix->flags & IMAGE_HAS_ALPHA )
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outsize = pix->width * pix->height * 4 + 18 + Q_strlen( comment );
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else outsize = pix->width * pix->height * 3 + 18 + Q_strlen( comment );
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buffer = (byte *)Mem_Alloc( host.imagepool, outsize );
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Q_memset( buffer, 0, 18 );
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// prepare header
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buffer[0] = Q_strlen( comment ); // tga comment length
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buffer[2] = 2; // uncompressed type
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buffer[12] = (pix->width >> 0) & 0xFF;
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buffer[13] = (pix->width >> 8) & 0xFF;
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buffer[14] = (pix->height >> 0) & 0xFF;
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buffer[15] = (pix->height >> 8) & 0xFF;
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buffer[16] = ( pix->flags & IMAGE_HAS_ALPHA ) ? 32 : 24;
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buffer[17] = ( pix->flags & IMAGE_HAS_ALPHA ) ? 8 : 0; // 8 bits of alpha
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Q_strncpy( buffer + 18, comment, Q_strlen( comment ));
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out = buffer + 18 + Q_strlen( comment );
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// get image description
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switch( pix->type )
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{
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case PF_RGB_24:
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case PF_BGR_24: pixel_size = 3; break;
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case PF_RGBA_32:
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case PF_BGRA_32: pixel_size = 4; break;
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default:
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MsgDev( D_ERROR, "Image_SaveTGA: unsupported image type %s\n", PFDesc[pix->type].name );
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Mem_Free( buffer );
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return false;
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}
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switch( pix->type )
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{
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case PF_RGB_24:
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case PF_RGBA_32:
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// swap rgba to bgra and flip upside down
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for( y = pix->height - 1; y >= 0; y-- )
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{
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in = pix->buffer + y * pix->width * pixel_size;
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bufend = in + pix->width * pixel_size;
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for( ; in < bufend; in += pixel_size )
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{
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*out++ = in[2];
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*out++ = in[1];
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*out++ = in[0];
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if( pix->flags & IMAGE_HAS_ALPHA )
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*out++ = in[3];
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}
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}
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break;
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case PF_BGR_24:
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case PF_BGRA_32:
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// flip upside down
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for( y = pix->height - 1; y >= 0; y-- )
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{
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in = pix->buffer + y * pix->width * pixel_size;
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bufend = in + pix->width * pixel_size;
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for( ; in < bufend; in += pixel_size )
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{
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*out++ = in[0];
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*out++ = in[1];
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*out++ = in[2];
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if( pix->flags & IMAGE_HAS_ALPHA )
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*out++ = in[3];
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}
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}
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break;
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}
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FS_WriteFile( name, buffer, outsize );
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Mem_Free( buffer );
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return true;
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} |