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targa.cpp
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executable file
·273 lines (238 loc) · 12.2 KB
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/*
Copyright (C) 2010 Matthew Baranowski, Sander van Rossen & Raven software.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "system.h"
#include "DiskIO.h"
#include "Targa.h"
#include "jpeg_interface.h"
typedef unsigned char byte;
struct TargaHeader {
unsigned char id_length, colormap_type, image_type;
unsigned short colormap_index, colormap_length;
unsigned char colormap_size;
unsigned short x_origin, y_origin, width, height;
unsigned char pixel_size, attributes;
};
void Error (char *error, ...);
void Debug (char *error, ...);
struct wordByte
{
unsigned char byte1;
unsigned char byte2;
};
union wordByteUnion
{
short word;
wordByte b;
};
/*
=======
accepts RGB format data in pixels and writes it uncompressed into file
=======
*/
void writeTGA( char *name, byte *pixels, int width, int height)
{
TargaHeader targa_header;
FILE *fin;
fin = fopen( name, "wb" );
if (!fin) {
Debug( "Coulnd't open file for writing" );
return;
}
memset( &targa_header, 0, sizeof( TargaHeader ) );
fputc( 0, fin ); //targa_header.id_length = 0;
fputc( 0, fin ); //targa_header.colormap_type = 0;
fputc( 2, fin ); //targa_header.image_type = 2;
put16( 0, fin ); //targa_header.colormap_index = 0;
put16( 0, fin ); //targa_header.colormap_length = 0;
fputc( 0, fin ); //targa_header.colormap_size = 0;
put16( 0,fin ); //targa_header.x_origin = 0;
put16( 0, fin ); //targa_header.y_origin = 0;
put16( width, fin );
put16( height,fin );
fputc( 24, fin ); //targa_header.pixel_size = 24 ;
fputc( 0, fin ); //targa_header.attributes = 0;
for (int i = 0; i < width*height*3; i+= 3)
{
fputc( (int)pixels[i+2], fin );
fputc( (int)pixels[i+1], fin );
fputc( (int)pixels[i], fin );
}
fclose(fin);
}
// now attempts to load a JPG if TGA load fails...
//
// (return value sent to "*format" param isn't actually used anywhere)
//
bool loadTGA (char *name, byte **pixels, unsigned int *width, unsigned int *height, unsigned int *format)
{
int columns, rows, numPixels;
byte *pixbuf;
int row, column;
FILE *fin;
byte *targa_rgba;
TargaHeader targa_header;
fin = fopen (name, "rb");
if (!fin) //Debug( "Couldn't read textures" );
{
char sLine[256];
strcpy(sLine,name);
strlwr(sLine);
char *p = strstr(sLine,".tga");
if (p)
{
strcpy(p,".jpg");
LoadJPG( sLine, pixels, (int*)width, (int*)height );
if (*pixels)
return true;
}
return false;
}
targa_header.id_length = fgetc(fin);
targa_header.colormap_type = fgetc(fin);
targa_header.image_type = fgetc(fin);
targa_header.colormap_index = get16(fin);
targa_header.colormap_length = get16(fin);
targa_header.colormap_size = fgetc(fin);
targa_header.x_origin = get16(fin);
targa_header.y_origin = get16(fin);
targa_header.width = get16(fin);
targa_header.height = get16(fin);
targa_header.pixel_size = fgetc(fin);
targa_header.attributes = fgetc(fin);
if (targa_header.image_type!=2
&& targa_header.image_type!=10)
Error ("LoadTGA: Only type 2 and 10 targa RGB images supported\n");
if (targa_header.colormap_type !=0
|| (targa_header.pixel_size!=32 && targa_header.pixel_size!=24))
Error ("Texture_LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n");
*format = targa_header.pixel_size;
columns = targa_header.width;
rows = targa_header.height;
numPixels = columns * rows;
if (width)
*width = columns;
if (height)
*height = rows;
targa_rgba = new unsigned char[numPixels*4];
*pixels = targa_rgba;
if (targa_header.id_length != 0)
fseek(fin, targa_header.id_length, SEEK_CUR); // skip TARGA image comment
if (targa_header.image_type==2) { // Uncompressed, RGB images
for(row=rows-1; row>=0; row--) {
pixbuf = targa_rgba + row*columns*4;
for(column=0; column<columns; column++) {
unsigned char red,green,blue,alphabyte;
switch (targa_header.pixel_size) {
case 24:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
}
}
}
else if (targa_header.image_type==10) { // Runlength encoded RGB images
unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j;
for(row=rows-1; row>=0; row--) {
pixbuf = targa_rgba + row*columns*4;
for(column=0; column<columns; ) {
packetHeader=getc(fin);
packetSize = 1 + (packetHeader & 0x7f);
if (packetHeader & 0x80) { // run-length packet
switch (targa_header.pixel_size) {
case 24:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = 255;
break;
case 32:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = getc(fin);
break;
}
for(j=0;j<packetSize;j++) {
*pixbuf++=red;
*pixbuf++=green;
*pixbuf++=blue;
*pixbuf++=alphabyte;
column++;
if (column==columns) { // run spans across rows
column=0;
if (row>0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row*columns*4;
}
}
}
else { // non run-length packet
for(j=0;j<packetSize;j++) {
switch (targa_header.pixel_size) {
case 24:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = 255;
break;
case 32:
blue = getc(fin);
green = getc(fin);
red = getc(fin);
alphabyte = getc(fin);
*pixbuf++ = red;
*pixbuf++ = green;
*pixbuf++ = blue;
*pixbuf++ = alphabyte;
break;
}
column++;
if (column==columns) { // pixel packet run spans across rows
column=0;
if (row>0)
row--;
else
goto breakOut;
pixbuf = targa_rgba + row*columns*4;
}
}
}
}
breakOut:;
}
}
fclose(fin);
return true;
}