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//
// mxToolKit (c) 1999 by Mete Ciragan
//
// file: mxTga.cpp
// implementation: all
// last modified: Apr 15 1999, Mete Ciragan
// copyright: The programs and associated files contained in this
// distribution were developed by Mete Ciragan. The programs
// are not in the public domain, but they are freely
// distributable without licensing fees. These programs are
// provided without guarantee or warrantee expressed or
// implied.
//
#include "mxtk/mxTga.h"
#include <stdio.h>
#include <stdlib.h>
mxImage *
mxTgaRead (const char *filename)
{
FILE *file;
file = fopen (filename, "rb");
if (!file)
return 0;
byte identFieldLength;
byte colorMapType;
byte imageTypeCode;
fread (&identFieldLength, sizeof (byte), 1, file);
fread (&colorMapType, sizeof (byte), 1, file);
fread (&imageTypeCode, sizeof (byte), 1, file);
fseek (file, 12, SEEK_SET);
word width, height;
byte pixelSize;
fread (&width, sizeof (word), 1, file);
fread (&height, sizeof (word), 1, file);
fread (&pixelSize, sizeof (byte), 1, file);
// only 24-bit RGB uncompressed
if (colorMapType != 0 ||
imageTypeCode != 2 ||
pixelSize != 24)
{
fclose (file);
return 0;
}
fseek (file, 18 + identFieldLength, SEEK_SET);
mxImage *image = new mxImage ();
if (!image->create (width, height, 24))
{
delete image;
fclose (file);
return 0;
}
byte *data = (byte *) image->data;
for (int y = 0; y < height; y++)
{
byte *scanline = (byte *) &data[(height - y - 1) * width * 3];
for (int x = 0; x < width; x++)
{
scanline[x * 3 + 2] = (byte) fgetc (file);
scanline[x * 3 + 1] = (byte) fgetc (file);
scanline[x * 3 + 0] = (byte) fgetc (file);
//scanline[x * 4 + 3] = 0xff;
}
}
fclose (file);
return image;
}
bool
mxTgaWrite (const char *filename, mxImage *image)
{
if (!image)
return false;
if (image->bpp != 24)
return false;
FILE *file = fopen (filename, "wb");
if (!file)
return false;
//
// write header
//
fputc (0, file); // identFieldLength
fputc (0, file); // colorMapType == 0, no color map
fputc (2, file); // imageTypeCode == 2, uncompressed RGB
word w = 0;
fwrite (&w, sizeof (word), 1, file); // colorMapOrigin
fwrite (&w, sizeof (word), 1, file); // colorMapLength
fputc (0, file); // colorMapEntrySize
fwrite (&w, sizeof (word), 1, file); // imageOriginX
fwrite (&w, sizeof (word), 1, file); // imageOriginY
w = (word) image->width;
fwrite (&w, sizeof (word), 1, file); // imageWidth
w = (word) image->height;
fwrite (&w, sizeof (word), 1, file); // imageHeight
fputc (24, file); // imagePixelSize
fputc (0, file); // imageDescriptorByte
// write no ident field
// write no color map
// write imagedata
byte *data = (byte *) image->data;
for (int y = 0; y < image->height; y++)
{
byte *scanline = (byte *) &data[(image->height - y - 1) * image->width * 3];
for (int x = 0; x < image->width; x++)
{
fputc ((byte) scanline[x * 3 + 2], file);
fputc ((byte) scanline[x * 3 + 1], file);
fputc ((byte) scanline[x * 3 + 0], file);
}
}
fclose (file);
return true;
}
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