michael@0: 
michael@0: #define COMPONENT_SIZE
michael@0: #define MASK
michael@0: #define ONE_HALF
michael@0: 
michael@0: #define A_SHIFT
michael@0: #define R_SHIFT
michael@0: #define G_SHIFT
michael@0: #define A_MASK
michael@0: #define R_MASK
michael@0: #define G_MASK
michael@0: 
michael@0: #define RB_MASK
michael@0: #define AG_MASK
michael@0: #define RB_ONE_HALF
michael@0: #define RB_MASK_PLUS_ONE
michael@0: 
michael@0: #define ALPHA_c(x) ((x) >> A_SHIFT)
michael@0: #define RED_c(x) (((x) >> R_SHIFT) & MASK)
michael@0: #define GREEN_c(x) (((x) >> G_SHIFT) & MASK)
michael@0: #define BLUE_c(x) ((x) & MASK)
michael@0: 
michael@0: /*
michael@0:  * Helper macros.
michael@0:  */
michael@0: 
michael@0: #define MUL_UNc(a, b, t)						\
michael@0:     ((t) = (a) * (comp2_t)(b) + ONE_HALF, ((((t) >> G_SHIFT ) + (t) ) >> G_SHIFT ))
michael@0: 
michael@0: #define DIV_UNc(a, b)							\
michael@0:     (((comp2_t) (a) * MASK + ((b) / 2)) / (b))
michael@0: 
michael@0: #define ADD_UNc(x, y, t)				     \
michael@0:     ((t) = (x) + (y),					     \
michael@0:      (comp4_t) (comp1_t) ((t) | (0 - ((t) >> G_SHIFT))))
michael@0: 
michael@0: #define DIV_ONE_UNc(x)							\
michael@0:     (((x) + ONE_HALF + (((x) + ONE_HALF) >> G_SHIFT)) >> G_SHIFT)
michael@0: 
michael@0: /*
michael@0:  * The methods below use some tricks to be able to do two color
michael@0:  * components at the same time.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * x_rb = (x_rb * a) / 255
michael@0:  */
michael@0: #define UNc_rb_MUL_UNc(x, a, t)						\
michael@0:     do									\
michael@0:     {									\
michael@0: 	t  = ((x) & RB_MASK) * (a);					\
michael@0: 	t += RB_ONE_HALF;						\
michael@0: 	x = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT;		\
michael@0: 	x &= RB_MASK;							\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_rb = min (x_rb + y_rb, 255)
michael@0:  */
michael@0: #define UNc_rb_ADD_UNc_rb(x, y, t)					\
michael@0:     do									\
michael@0:     {									\
michael@0: 	t = ((x) + (y));						\
michael@0: 	t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK);		\
michael@0: 	x = (t & RB_MASK);						\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_rb = (x_rb * a_rb) / 255
michael@0:  */
michael@0: #define UNc_rb_MUL_UNc_rb(x, a, t)					\
michael@0:     do									\
michael@0:     {									\
michael@0: 	t  = (x & MASK) * (a & MASK);					\
michael@0: 	t |= (x & R_MASK) * ((a >> R_SHIFT) & MASK);			\
michael@0: 	t += RB_ONE_HALF;						\
michael@0: 	t = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT;		\
michael@0: 	x = t & RB_MASK;						\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_c = (x_c * a) / 255
michael@0:  */
michael@0: #define UNcx4_MUL_UNc(x, a)						\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x);							\
michael@0: 	UNc_rb_MUL_UNc (r1__, (a), t__);				\
michael@0: 									\
michael@0: 	r2__ = (x) >> G_SHIFT;						\
michael@0: 	UNc_rb_MUL_UNc (r2__, (a), t__);				\
michael@0: 									\
michael@0: 	(x) = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_c = (x_c * a) / 255 + y_c
michael@0:  */
michael@0: #define UNcx4_MUL_UNc_ADD_UNcx4(x, a, y)				\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, r3__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x);							\
michael@0: 	r2__ = (y) & RB_MASK;						\
michael@0: 	UNc_rb_MUL_UNc (r1__, (a), t__);				\
michael@0: 	UNc_rb_ADD_UNc_rb (r1__, r2__, t__);				\
michael@0: 									\
michael@0: 	r2__ = (x) >> G_SHIFT;						\
michael@0: 	r3__ = ((y) >> G_SHIFT) & RB_MASK;				\
michael@0: 	UNc_rb_MUL_UNc (r2__, (a), t__);				\
michael@0: 	UNc_rb_ADD_UNc_rb (r2__, r3__, t__);				\
michael@0: 									\
michael@0: 	(x) = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_c = (x_c * a + y_c * b) / 255
michael@0:  */
michael@0: #define UNcx4_MUL_UNc_ADD_UNcx4_MUL_UNc(x, a, y, b)			\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, r3__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x);							\
michael@0: 	r2__ = (y);							\
michael@0: 	UNc_rb_MUL_UNc (r1__, (a), t__);				\
michael@0: 	UNc_rb_MUL_UNc (r2__, (b), t__);				\
michael@0: 	UNc_rb_ADD_UNc_rb (r1__, r2__, t__);				\
michael@0: 									\
michael@0: 	r2__ = ((x) >> G_SHIFT);					\
michael@0: 	r3__ = ((y) >> G_SHIFT);					\
michael@0: 	UNc_rb_MUL_UNc (r2__, (a), t__);				\
michael@0: 	UNc_rb_MUL_UNc (r3__, (b), t__);				\
michael@0: 	UNc_rb_ADD_UNc_rb (r2__, r3__, t__);				\
michael@0: 									\
michael@0: 	(x) = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_c = (x_c * a_c) / 255
michael@0:  */
michael@0: #define UNcx4_MUL_UNcx4(x, a)						\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, r3__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x);							\
michael@0: 	r2__ = (a);							\
michael@0: 	UNc_rb_MUL_UNc_rb (r1__, r2__, t__);				\
michael@0: 									\
michael@0: 	r2__ = (x) >> G_SHIFT;						\
michael@0: 	r3__ = (a) >> G_SHIFT;						\
michael@0: 	UNc_rb_MUL_UNc_rb (r2__, r3__, t__);				\
michael@0: 									\
michael@0: 	(x) = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_c = (x_c * a_c) / 255 + y_c
michael@0:  */
michael@0: #define UNcx4_MUL_UNcx4_ADD_UNcx4(x, a, y)				\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, r3__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x);							\
michael@0: 	r2__ = (a);							\
michael@0: 	UNc_rb_MUL_UNc_rb (r1__, r2__, t__);				\
michael@0: 	r2__ = (y) & RB_MASK;						\
michael@0: 	UNc_rb_ADD_UNc_rb (r1__, r2__, t__);				\
michael@0: 									\
michael@0: 	r2__ = ((x) >> G_SHIFT);					\
michael@0: 	r3__ = ((a) >> G_SHIFT);					\
michael@0: 	UNc_rb_MUL_UNc_rb (r2__, r3__, t__);				\
michael@0: 	r3__ = ((y) >> G_SHIFT) & RB_MASK;				\
michael@0: 	UNc_rb_ADD_UNc_rb (r2__, r3__, t__);				\
michael@0: 									\
michael@0: 	(x) = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:  * x_c = (x_c * a_c + y_c * b) / 255
michael@0:  */
michael@0: #define UNcx4_MUL_UNcx4_ADD_UNcx4_MUL_UNc(x, a, y, b)			\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, r3__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x);							\
michael@0: 	r2__ = (a);							\
michael@0: 	UNc_rb_MUL_UNc_rb (r1__, r2__, t__);				\
michael@0: 	r2__ = (y);							\
michael@0: 	UNc_rb_MUL_UNc (r2__, (b), t__);				\
michael@0: 	UNc_rb_ADD_UNc_rb (r1__, r2__, t__);				\
michael@0: 									\
michael@0: 	r2__ = (x) >> G_SHIFT;						\
michael@0: 	r3__ = (a) >> G_SHIFT;						\
michael@0: 	UNc_rb_MUL_UNc_rb (r2__, r3__, t__);				\
michael@0: 	r3__ = (y) >> G_SHIFT;						\
michael@0: 	UNc_rb_MUL_UNc (r3__, (b), t__);				\
michael@0: 	UNc_rb_ADD_UNc_rb (r2__, r3__, t__);				\
michael@0: 									\
michael@0: 	x = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)
michael@0: 
michael@0: /*
michael@0:   x_c = min(x_c + y_c, 255)
michael@0: */
michael@0: #define UNcx4_ADD_UNcx4(x, y)						\
michael@0:     do									\
michael@0:     {									\
michael@0: 	comp4_t r1__, r2__, r3__, t__;					\
michael@0: 									\
michael@0: 	r1__ = (x) & RB_MASK;						\
michael@0: 	r2__ = (y) & RB_MASK;						\
michael@0: 	UNc_rb_ADD_UNc_rb (r1__, r2__, t__);				\
michael@0: 									\
michael@0: 	r2__ = ((x) >> G_SHIFT) & RB_MASK;				\
michael@0: 	r3__ = ((y) >> G_SHIFT) & RB_MASK;				\
michael@0: 	UNc_rb_ADD_UNc_rb (r2__, r3__, t__);				\
michael@0: 									\
michael@0: 	x = r1__ | (r2__ << G_SHIFT);					\
michael@0:     } while (0)