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src/Source/Utilities.h  view on Meta::CPAN

	WORD result;
	result = ((arg << 8) & 0xFF00) | ((arg >> 8) & 0x00FF); 
	return result; 
#endif 
} 
 
inline DWORD 
__SwapUInt32(DWORD arg) { 
#if defined(_MSC_VER) && _MSC_VER >= 1310 
	return _byteswap_ulong(arg); 
#elif defined(__i386__) && defined(__GNUC__) 
	__asm__("bswap %0" : "+r" (arg)); 
	return arg; 
#elif defined(__ppc__) && defined(__GNUC__) 
	DWORD result; 
	__asm__("lwbrx %0,0,%1" : "=r" (result) : "r" (&arg), "m" (arg)); 
	return result; 
#else 
	// swap words then bytes
	DWORD result; 
	result = ((arg & 0x000000FF) << 24) | ((arg & 0x0000FF00) << 8) | ((arg >> 8) & 0x0000FF00) | ((arg >> 24) & 0x000000FF); 
	return result; 
#endif 
} 
 
/**
for later use ...
inline uint64_t 
SwapInt64(uint64_t arg) { 
#if defined(_MSC_VER) && _MSC_VER >= 1310 
	return _byteswap_uint64(arg); 
#else 
	union Swap { 
		uint64_t sv; 
		uint32_t ul[2]; 
	} tmp, result; 
	tmp.sv = arg; 
	result.ul[0] = SwapInt32(tmp.ul[1]);  
	result.ul[1] = SwapInt32(tmp.ul[0]); 
	return result.sv; 
#endif 
} 
*/

inline void
SwapShort(WORD *sp) {
	*sp = __SwapUInt16(*sp);
}

inline void
SwapLong(DWORD *lp) {
	*lp = __SwapUInt32(*lp);
}

// ==========================================================
//   Greyscale and color conversion
// ==========================================================

/**
Extract the luminance channel L from a RGBF image. 
Luminance is calculated from the sRGB model using a D65 white point, using the Rec.709 formula : 
L = ( 0.2126 * r ) + ( 0.7152 * g ) + ( 0.0722 * b )
Reference : 
A Standard Default Color Space for the Internet - sRGB. 
[online] http://www.w3.org/Graphics/Color/sRGB
*/
#define LUMA_REC709(r, g, b)	(0.2126F * r + 0.7152F * g + 0.0722F * b)

#define GREY(r, g, b) (BYTE)(LUMA_REC709(r, g, b) + 0.5F)
/*
#define GREY(r, g, b) (BYTE)(((WORD)r * 77 + (WORD)g * 150 + (WORD)b * 29) >> 8)	// .299R + .587G + .114B
*/
/*
#define GREY(r, g, b) (BYTE)(((WORD)r * 169 + (WORD)g * 256 + (WORD)b * 87) >> 9)	// .33R + 0.5G + .17B
*/

#define RGB565(b, g, r) ((((b) >> 3) << FI16_565_BLUE_SHIFT) | (((g) >> 2) << FI16_565_GREEN_SHIFT) | (((r) >> 3) << FI16_565_RED_SHIFT))
#define RGB555(b, g, r) ((((b) >> 3) << FI16_555_BLUE_SHIFT) | (((g) >> 3) << FI16_555_GREEN_SHIFT) | (((r) >> 3) << FI16_555_RED_SHIFT))

#define IS_FORMAT_RGB565(dib) ((FreeImage_GetRedMask(dib) == FI16_565_RED_MASK) && (FreeImage_GetGreenMask(dib) == FI16_565_GREEN_MASK) && (FreeImage_GetBlueMask(dib) == FI16_565_BLUE_MASK))
#define RGBQUAD_TO_WORD(dib, color) (IS_FORMAT_RGB565(dib) ? RGB565((color)->rgbBlue, (color)->rgbGreen, (color)->rgbRed) : RGB555((color)->rgbBlue, (color)->rgbGreen, (color)->rgbRed))

#define CREATE_GREYSCALE_PALETTE(palette, entries) \
	for (unsigned i = 0, v = 0; i < entries; i++, v += 0x00FFFFFF / (entries - 1)) { \
		((unsigned *)palette)[i] = v; \
	}

#define CREATE_GREYSCALE_PALETTE_REVERSE(palette, entries) \
	for (unsigned i = 0, v = 0x00FFFFFF; i < entries; i++, v -= (0x00FFFFFF / (entries - 1))) { \
		((unsigned *)palette)[i] = v; \
	}

// ==========================================================
//   Generic error messages
// ==========================================================

static const char *FI_MSG_ERROR_MEMORY = "Memory allocation failed";
static const char *FI_MSG_ERROR_DIB_MEMORY = "DIB allocation failed, maybe caused by an invalid image size or by a lack of memory";
static const char *FI_MSG_ERROR_PARSING = "Parsing error";
static const char *FI_MSG_ERROR_MAGIC_NUMBER = "Invalid magic number";
static const char *FI_MSG_ERROR_UNSUPPORTED_FORMAT = "Unsupported format";
static const char *FI_MSG_ERROR_UNSUPPORTED_COMPRESSION = "Unsupported compression type";
static const char *FI_MSG_WARNING_INVALID_THUMBNAIL = "Warning: attached thumbnail cannot be written to output file (invalid format) - Thumbnail saving aborted";

#endif // UTILITIES_H