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Browse - programming tips - width and height targa file

Date: 2009may14

Q.  How can I get the width and height (dimensions) of a Targa (.TGA) file?

A.  Here's a simple routine that does it:

// Helper routine
inline size_t Read(FILE *f, void *buf, const size_t size)
{
	return fread(buf, 1, size, f);
}

// Helper routine
inline BOOL GetChunk(FILE *f, void *buf, const size_t size)
{
	return Read(f, buf, size) == size;
}

// Helper routine
static BOOL GetWordIntel(FILE *f, WORD &w)
{
	BYTE	buf[2];

	if (!GetChunk(f, buf, sizeof(buf))) return FALSE;
	w = (buf[1]<<8) | buf[0];
	return TRUE;
}

BOOL TargaDim(LPCSTR szFile, int *pWidth, int *pHeight)
{
	FILE			*f;
	WORD			wWidth, wHeight;

	if (f = fopen(szFile, "rb")) == NULL) return FALSE;
	if (fseek(f, 12, SEEK_SET) != 0) { fclose(f); return FALSE; }
	if (!GetWordIntel(f, wWidth)) { fclose(f); return FALSE; }
	if (!GetWordIntel(f, wHeight)) { fclose(f); return FALSE; }
	fclose(f);

	if (pWidth != NULL) *pWidth = wWidth;
	if (pHeight != NULL) *pHeight = wHeight;

	return TRUE;
}

// Example Use
main()
{
	int	width, height;

	TargaDim("myfile.tga", &width, &height);
	printf("width=%d, height=%d\n", width, height);
}

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