Differential D1082 Diff 3432 source/blender/blenlib/intern/math_color_inline.c

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source/blender/blenlib/intern/math_color_inline.c

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	r_col[2] = ((pack) >> 16) & 0xFF;	r_col[2] = ((pack) >> 16) & 0xFF;
	}	}

	/* TODO:
	*
	* regarding #rgb_to_bw vs #rgb_to_grayscale,
	* it seems nobody knows why we have both functions which convert color to grays
	* but with different influences, this is quite stupid, and should be resolved
	* by someone who knows this stuff: see this thread
	* http://lists.blender.org/pipermail/bf-committers/2012-June/037180.html
	*
	* Only conclusion is that rgb_to_grayscale is used more for compositing.
	*/
	MINLINE float rgb_to_bw(const float rgb[3])
	{
	return 0.35f * rgb[0] + 0.45f * rgb[1] + 0.2f * rgb[2];
	}

	/* non-linear luma from ITU-R BT.601-2
	* see: http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC11
	* note: the values used for are not exact matches to those documented above,
	* but they are from the same */
	MINLINE float rgb_to_grayscale(const float rgb[3])
	{
	return 0.3f * rgb[0] + 0.58f * rgb[1] + 0.12f * rgb[2];
	}

	MINLINE unsigned char rgb_to_grayscale_byte(const unsigned char rgb[3])
	{
	return (unsigned char)(((76 * (unsigned short)rgb[0]) +
	(148 * (unsigned short)rgb[1]) +
	(31 * (unsigned short)rgb[2])) / 255);
	}

	/* luma from defined by 'YCC_JFIF', see #rgb_to_ycc */
	MINLINE float rgb_to_luma(const float rgb[3])
	{
	return 0.299f * rgb[0] + 0.587f * rgb[1] + 0.114f * rgb[2];
	}

	MINLINE unsigned char rgb_to_luma_byte(const unsigned char rgb[3])
	{
	return (unsigned char)(((76 * (unsigned short)rgb[0]) +
	(150 * (unsigned short)rgb[1]) +
	(29 * (unsigned short)rgb[2])) / 255);
	}

	/* gamma-corrected RGB --> CIE XYZ
	* for this function we only get the Y component
	* see: http://software.intel.com/sites/products/documentation/hpc/ipp/ippi/ippi_ch6/ch6_color_models.html
	*
	* also known as:
	* luminance rec. 709 */
	MINLINE float rgb_to_luma_y(const float rgb[3])
	{
	return 0.212671f * rgb[0] + 0.71516f * rgb[1] + 0.072169f * rgb[2];
	}

	MINLINE int compare_rgb_uchar(const unsigned char col_a[3], const unsigned char col_b[3], const int limit)	MINLINE int compare_rgb_uchar(const unsigned char col_a[3], const unsigned char col_b[3], const int limit)
	{	{
	const int r = (int)col_a[0] - (int)col_b[0];	const int r = (int)col_a[0] - (int)col_b[0];
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