mirror of https://github.com/UberGames/MD3View.git
274 lines
12 KiB
C++
274 lines
12 KiB
C++
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/*
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Copyright (C) 2010 Matthew Baranowski, Sander van Rossen & Raven software.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "system.h"
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#include "DiskIO.h"
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#include "Targa.h"
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#include "jpeg_interface.h"
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typedef unsigned char byte;
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struct TargaHeader {
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unsigned char id_length, colormap_type, image_type;
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unsigned short colormap_index, colormap_length;
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unsigned char colormap_size;
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unsigned short x_origin, y_origin, width, height;
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unsigned char pixel_size, attributes;
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};
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void Error (char *error, ...);
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void Debug (char *error, ...);
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struct wordByte
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{
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unsigned char byte1;
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unsigned char byte2;
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};
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union wordByteUnion
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{
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short word;
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wordByte b;
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};
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/*
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=======
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accepts RGB format data in pixels and writes it uncompressed into file
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=======
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*/
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void writeTGA( char *name, byte *pixels, int width, int height)
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{
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TargaHeader targa_header;
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FILE *fin;
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fin = fopen( name, "wb" );
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if (!fin) {
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Debug( "Coulnd't open file for writing" );
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return;
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}
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memset( &targa_header, 0, sizeof( TargaHeader ) );
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fputc( 0, fin ); //targa_header.id_length = 0;
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fputc( 0, fin ); //targa_header.colormap_type = 0;
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fputc( 2, fin ); //targa_header.image_type = 2;
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put16( 0, fin ); //targa_header.colormap_index = 0;
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put16( 0, fin ); //targa_header.colormap_length = 0;
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fputc( 0, fin ); //targa_header.colormap_size = 0;
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put16( 0,fin ); //targa_header.x_origin = 0;
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put16( 0, fin ); //targa_header.y_origin = 0;
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put16( width, fin );
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put16( height,fin );
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fputc( 24, fin ); //targa_header.pixel_size = 24 ;
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fputc( 0, fin ); //targa_header.attributes = 0;
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for (int i = 0; i < width*height*3; i+= 3)
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{
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fputc( (int)pixels[i+2], fin );
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fputc( (int)pixels[i+1], fin );
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fputc( (int)pixels[i], fin );
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}
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fclose(fin);
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}
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// now attempts to load a JPG if TGA load fails...
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//
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// (return value sent to "*format" param isn't actually used anywhere)
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//
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bool loadTGA (char *name, byte **pixels, unsigned int *width, unsigned int *height, unsigned int *format)
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{
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int columns, rows, numPixels;
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byte *pixbuf;
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int row, column;
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FILE *fin;
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byte *targa_rgba;
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TargaHeader targa_header;
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fin = fopen (name, "rb");
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if (!fin) //Debug( "Couldn't read textures" );
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{
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char sLine[256];
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strcpy(sLine,name);
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strlwr(sLine);
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char *p = strstr(sLine,".tga");
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if (p)
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{
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strcpy(p,".jpg");
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LoadJPG( sLine, pixels, (int*)width, (int*)height );
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if (*pixels)
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return true;
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}
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return false;
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}
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targa_header.id_length = fgetc(fin);
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targa_header.colormap_type = fgetc(fin);
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targa_header.image_type = fgetc(fin);
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targa_header.colormap_index = get16(fin);
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targa_header.colormap_length = get16(fin);
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targa_header.colormap_size = fgetc(fin);
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targa_header.x_origin = get16(fin);
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targa_header.y_origin = get16(fin);
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targa_header.width = get16(fin);
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targa_header.height = get16(fin);
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targa_header.pixel_size = fgetc(fin);
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targa_header.attributes = fgetc(fin);
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if (targa_header.image_type!=2
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&& targa_header.image_type!=10)
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Error ("LoadTGA: Only type 2 and 10 targa RGB images supported\n");
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if (targa_header.colormap_type !=0
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|| (targa_header.pixel_size!=32 && targa_header.pixel_size!=24))
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Error ("Texture_LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
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*format = targa_header.pixel_size;
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columns = targa_header.width;
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rows = targa_header.height;
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numPixels = columns * rows;
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if (width)
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*width = columns;
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if (height)
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*height = rows;
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targa_rgba = new unsigned char[numPixels*4];
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*pixels = targa_rgba;
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if (targa_header.id_length != 0)
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fseek(fin, targa_header.id_length, SEEK_CUR); // skip TARGA image comment
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if (targa_header.image_type==2) { // Uncompressed, RGB images
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for(row=rows-1; row>=0; row--) {
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pixbuf = targa_rgba + row*columns*4;
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for(column=0; column<columns; column++) {
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unsigned char red,green,blue,alphabyte;
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switch (targa_header.pixel_size) {
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case 24:
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blue = getc(fin);
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green = getc(fin);
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red = getc(fin);
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 32:
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blue = getc(fin);
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green = getc(fin);
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red = getc(fin);
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alphabyte = getc(fin);
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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break;
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}
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}
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}
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}
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else if (targa_header.image_type==10) { // Runlength encoded RGB images
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unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
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for(row=rows-1; row>=0; row--) {
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pixbuf = targa_rgba + row*columns*4;
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for(column=0; column<columns; ) {
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packetHeader=getc(fin);
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packetSize = 1 + (packetHeader & 0x7f);
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if (packetHeader & 0x80) { // run-length packet
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switch (targa_header.pixel_size) {
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case 24:
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blue = getc(fin);
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green = getc(fin);
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red = getc(fin);
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alphabyte = 255;
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break;
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case 32:
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blue = getc(fin);
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green = getc(fin);
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red = getc(fin);
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alphabyte = getc(fin);
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break;
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}
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for(j=0;j<packetSize;j++) {
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*pixbuf++=red;
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*pixbuf++=green;
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*pixbuf++=blue;
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*pixbuf++=alphabyte;
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column++;
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if (column==columns) { // run spans across rows
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column=0;
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if (row>0)
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row--;
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else
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goto breakOut;
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pixbuf = targa_rgba + row*columns*4;
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}
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}
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}
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else { // non run-length packet
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for(j=0;j<packetSize;j++) {
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switch (targa_header.pixel_size) {
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case 24:
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blue = getc(fin);
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green = getc(fin);
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red = getc(fin);
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = 255;
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break;
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case 32:
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blue = getc(fin);
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green = getc(fin);
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red = getc(fin);
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alphabyte = getc(fin);
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*pixbuf++ = red;
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*pixbuf++ = green;
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*pixbuf++ = blue;
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*pixbuf++ = alphabyte;
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break;
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}
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column++;
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if (column==columns) { // pixel packet run spans across rows
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column=0;
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if (row>0)
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row--;
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else
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goto breakOut;
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pixbuf = targa_rgba + row*columns*4;
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}
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}
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}
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}
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breakOut:;
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}
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}
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fclose(fin);
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return true;
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}
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