colorspace.h File Reference

Various defines for YUV<->RGB conversion. More...

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Macros
#define	SCALEBITS   10
#define	ONE_HALF   (1 << (SCALEBITS - 1))
#define	FIX(x)   ((int) ((x) * (1<<SCALEBITS) + 0.5))
#define	YUV_TO_RGB1_CCIR(cb1, cr1)
#define	YUV_TO_RGB1_CCIR_BT709(cb1, cr1)
#define	YUV_TO_RGB2_CCIR(r, g, b, y1)
#define	YUV_TO_RGB1(cb1, cr1)
#define	YUV_TO_RGB2(r, g, b, y1)
#define	Y_CCIR_TO_JPEG(y)   cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]
#define	Y_JPEG_TO_CCIR(y)   (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
#define	C_CCIR_TO_JPEG(y)   cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]
#define	RGB_TO_Y_CCIR(r, g, b)
#define	RGB_TO_U_CCIR(r1, g1, b1, shift)
#define	RGB_TO_V_CCIR(r1, g1, b1, shift)

Detailed Description

Various defines for YUV<->RGB conversion.

Macro Definition Documentation

RGB_TO_U_CCIR

#define RGB_TO_U_CCIR	(		r1,
			g1,
			b1,
			shift
	)

Value:

(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +         \
     FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

RGB_TO_V_CCIR

#define RGB_TO_V_CCIR	(		r1,
			g1,
			b1,
			shift
	)

Value:

(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -           \
   FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

RGB_TO_Y_CCIR

#define RGB_TO_Y_CCIR	(		r,
			g,
			b
	)

Value:

((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
  FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)

YUV_TO_RGB1

#define YUV_TO_RGB1	(		cb1,
			cr1
	)

Value:

{\
    cb = (cb1) - 128;\
    cr = (cr1) - 128;\
    r_add = FIX(1.40200) * cr + ONE_HALF;\
    g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
    b_add = FIX(1.77200) * cb + ONE_HALF;\
}

YUV_TO_RGB1_CCIR

#define YUV_TO_RGB1_CCIR	(		cb1,
			cr1
	)

Value:

{\
    cb = (cb1) - 128;\
    cr = (cr1) - 128;\
    r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
    g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
            ONE_HALF;\
    b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}

YUV_TO_RGB1_CCIR_BT709

#define YUV_TO_RGB1_CCIR_BT709	(		cb1,
			cr1
	)

Value:

{                                                         \
        cb    = (cb1) - 128;                                  \
        cr    = (cr1) - 128;                                  \
        r_add = ONE_HALF + FIX(1.5747 * 255.0 / 224.0) * cr;  \
        g_add = ONE_HALF - FIX(0.1873 * 255.0 / 224.0) * cb - \
                           FIX(0.4682 * 255.0 / 224.0) * cr;  \
        b_add = ONE_HALF + FIX(1.8556 * 255.0 / 224.0) * cb;  \
    }

YUV_TO_RGB2

#define YUV_TO_RGB2	(		r,
			g,
			b,
			y1
	)

Value:

{\
    y = (y1) << SCALEBITS;\
    r = cm[(y + r_add) >> SCALEBITS];\
    g = cm[(y + g_add) >> SCALEBITS];\
    b = cm[(y + b_add) >> SCALEBITS];\
}

YUV_TO_RGB2_CCIR

#define YUV_TO_RGB2_CCIR	(		r,
			g,
			b,
			y1
	)

Value:

{\
    y = ((y1) - 16) * FIX(255.0/219.0);\
    r = cm[(y + r_add) >> SCALEBITS];\
    g = cm[(y + g_add) >> SCALEBITS];\
    b = cm[(y + b_add) >> SCALEBITS];\
}