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