initial

utils/mxtk/mxtga.cpp

@@ -0,0 +1,140 @@
+//
+//                 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;
+}