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305 lines
7.9 KiB
305 lines
7.9 KiB
/* |
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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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#include "mathlib.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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int reflectivity[3] = { 0, 0, 0 }; |
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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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Con_DPrintf( S_ERROR "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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Con_DPrintf( S_ERROR "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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Con_DPrintf( S_ERROR "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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Con_DPrintf( S_ERROR "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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Con_DPrintf( S_ERROR "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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Con_DPrintf( S_ERROR "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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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_Malloc( 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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reflectivity[0] += red; |
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reflectivity[1] += green; |
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reflectivity[2] += blue; |
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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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VectorDivide( reflectivity, ( image.width * image.height ), image.fogParams ); |
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image.depth = 1; |
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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_Calloc( host.imagepool, outsize ); |
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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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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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} |