273 lines
6.9 KiB
C
273 lines
6.9 KiB
C
#define COMPONENT_SIZE 8
|
|
#define MASK 0xff
|
|
#define ONE_HALF 0x80
|
|
|
|
#define A_SHIFT 8 * 3
|
|
#define R_SHIFT 8 * 2
|
|
#define G_SHIFT 8
|
|
#define A_MASK 0xff000000
|
|
#define R_MASK 0xff0000
|
|
#define G_MASK 0xff00
|
|
|
|
#define RB_MASK 0xff00ff
|
|
#define AG_MASK 0xff00ff00
|
|
#define RB_ONE_HALF 0x800080
|
|
#define RB_MASK_PLUS_ONE 0x10000100
|
|
|
|
#define ALPHA_8(x) ((x) >> A_SHIFT)
|
|
#define RED_8(x) (((x) >> R_SHIFT) & MASK)
|
|
#define GREEN_8(x) (((x) >> G_SHIFT) & MASK)
|
|
#define BLUE_8(x) ((x) & MASK)
|
|
|
|
/*
|
|
* ARMv6 has UQADD8 instruction, which implements unsigned saturated
|
|
* addition for 8-bit values packed in 32-bit registers. It is very useful
|
|
* for UN8x4_ADD_UN8x4, UN8_rb_ADD_UN8_rb and ADD_UN8 macros (which would
|
|
* otherwise need a lot of arithmetic operations to simulate this operation).
|
|
* Since most of the major ARM linux distros are built for ARMv7, we are
|
|
* much less dependent on runtime CPU detection and can get practical
|
|
* benefits from conditional compilation here for a lot of users.
|
|
*/
|
|
|
|
#if defined(USE_GCC_INLINE_ASM) && defined(__arm__) && \
|
|
!defined(__aarch64__) && (!defined(__thumb__) || defined(__thumb2__))
|
|
#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || \
|
|
defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || \
|
|
defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) || \
|
|
defined(__ARM_ARCH_6M__) || defined(__ARM_ARCH_7__) || \
|
|
defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || \
|
|
defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
|
|
|
|
static force_inline uint32_t
|
|
un8x4_add_un8x4 (uint32_t x, uint32_t y)
|
|
{
|
|
uint32_t t;
|
|
asm ("uqadd8 %0, %1, %2" : "=r" (t) : "%r" (x), "r" (y));
|
|
return t;
|
|
}
|
|
|
|
#define UN8x4_ADD_UN8x4(x, y) \
|
|
((x) = un8x4_add_un8x4 ((x), (y)))
|
|
|
|
#define UN8_rb_ADD_UN8_rb(x, y, t) \
|
|
((t) = un8x4_add_un8x4 ((x), (y)), (x) = (t))
|
|
|
|
#define ADD_UN8(x, y, t) \
|
|
((t) = (x), un8x4_add_un8x4 ((t), (y)))
|
|
|
|
#endif
|
|
#endif
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*
|
|
* Helper macros.
|
|
*/
|
|
|
|
#define MUL_UN8(a, b, t) \
|
|
((t) = (a) * (uint16_t)(b) + ONE_HALF, ((((t) >> G_SHIFT ) + (t) ) >> G_SHIFT ))
|
|
|
|
#define DIV_UN8(a, b) \
|
|
(((uint16_t) (a) * MASK + ((b) / 2)) / (b))
|
|
|
|
#ifndef ADD_UN8
|
|
#define ADD_UN8(x, y, t) \
|
|
((t) = (x) + (y), \
|
|
(uint32_t) (uint8_t) ((t) | (0 - ((t) >> G_SHIFT))))
|
|
#endif
|
|
|
|
#define DIV_ONE_UN8(x) \
|
|
(((x) + ONE_HALF + (((x) + ONE_HALF) >> G_SHIFT)) >> G_SHIFT)
|
|
|
|
/*
|
|
* The methods below use some tricks to be able to do two color
|
|
* components at the same time.
|
|
*/
|
|
|
|
/*
|
|
* x_rb = (x_rb * a) / 255
|
|
*/
|
|
#define UN8_rb_MUL_UN8(x, a, t) \
|
|
do \
|
|
{ \
|
|
t = ((x) & RB_MASK) * (a); \
|
|
t += RB_ONE_HALF; \
|
|
x = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
|
|
x &= RB_MASK; \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_rb = min (x_rb + y_rb, 255)
|
|
*/
|
|
#ifndef UN8_rb_ADD_UN8_rb
|
|
#define UN8_rb_ADD_UN8_rb(x, y, t) \
|
|
do \
|
|
{ \
|
|
t = ((x) + (y)); \
|
|
t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \
|
|
x = (t & RB_MASK); \
|
|
} while (0)
|
|
#endif
|
|
|
|
/*
|
|
* x_rb = (x_rb * a_rb) / 255
|
|
*/
|
|
#define UN8_rb_MUL_UN8_rb(x, a, t) \
|
|
do \
|
|
{ \
|
|
t = (x & MASK) * (a & MASK); \
|
|
t |= (x & R_MASK) * ((a >> R_SHIFT) & MASK); \
|
|
t += RB_ONE_HALF; \
|
|
t = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
|
|
x = t & RB_MASK; \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_c = (x_c * a) / 255
|
|
*/
|
|
#define UN8x4_MUL_UN8(x, a) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, t__; \
|
|
\
|
|
r1__ = (x); \
|
|
UN8_rb_MUL_UN8 (r1__, (a), t__); \
|
|
\
|
|
r2__ = (x) >> G_SHIFT; \
|
|
UN8_rb_MUL_UN8 (r2__, (a), t__); \
|
|
\
|
|
(x) = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_c = (x_c * a) / 255 + y_c
|
|
*/
|
|
#define UN8x4_MUL_UN8_ADD_UN8x4(x, a, y) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, r3__, t__; \
|
|
\
|
|
r1__ = (x); \
|
|
r2__ = (y) & RB_MASK; \
|
|
UN8_rb_MUL_UN8 (r1__, (a), t__); \
|
|
UN8_rb_ADD_UN8_rb (r1__, r2__, t__); \
|
|
\
|
|
r2__ = (x) >> G_SHIFT; \
|
|
r3__ = ((y) >> G_SHIFT) & RB_MASK; \
|
|
UN8_rb_MUL_UN8 (r2__, (a), t__); \
|
|
UN8_rb_ADD_UN8_rb (r2__, r3__, t__); \
|
|
\
|
|
(x) = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_c = (x_c * a + y_c * b) / 255
|
|
*/
|
|
#define UN8x4_MUL_UN8_ADD_UN8x4_MUL_UN8(x, a, y, b) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, r3__, t__; \
|
|
\
|
|
r1__ = (x); \
|
|
r2__ = (y); \
|
|
UN8_rb_MUL_UN8 (r1__, (a), t__); \
|
|
UN8_rb_MUL_UN8 (r2__, (b), t__); \
|
|
UN8_rb_ADD_UN8_rb (r1__, r2__, t__); \
|
|
\
|
|
r2__ = ((x) >> G_SHIFT); \
|
|
r3__ = ((y) >> G_SHIFT); \
|
|
UN8_rb_MUL_UN8 (r2__, (a), t__); \
|
|
UN8_rb_MUL_UN8 (r3__, (b), t__); \
|
|
UN8_rb_ADD_UN8_rb (r2__, r3__, t__); \
|
|
\
|
|
(x) = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_c = (x_c * a_c) / 255
|
|
*/
|
|
#define UN8x4_MUL_UN8x4(x, a) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, r3__, t__; \
|
|
\
|
|
r1__ = (x); \
|
|
r2__ = (a); \
|
|
UN8_rb_MUL_UN8_rb (r1__, r2__, t__); \
|
|
\
|
|
r2__ = (x) >> G_SHIFT; \
|
|
r3__ = (a) >> G_SHIFT; \
|
|
UN8_rb_MUL_UN8_rb (r2__, r3__, t__); \
|
|
\
|
|
(x) = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_c = (x_c * a_c) / 255 + y_c
|
|
*/
|
|
#define UN8x4_MUL_UN8x4_ADD_UN8x4(x, a, y) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, r3__, t__; \
|
|
\
|
|
r1__ = (x); \
|
|
r2__ = (a); \
|
|
UN8_rb_MUL_UN8_rb (r1__, r2__, t__); \
|
|
r2__ = (y) & RB_MASK; \
|
|
UN8_rb_ADD_UN8_rb (r1__, r2__, t__); \
|
|
\
|
|
r2__ = ((x) >> G_SHIFT); \
|
|
r3__ = ((a) >> G_SHIFT); \
|
|
UN8_rb_MUL_UN8_rb (r2__, r3__, t__); \
|
|
r3__ = ((y) >> G_SHIFT) & RB_MASK; \
|
|
UN8_rb_ADD_UN8_rb (r2__, r3__, t__); \
|
|
\
|
|
(x) = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
|
|
/*
|
|
* x_c = (x_c * a_c + y_c * b) / 255
|
|
*/
|
|
#define UN8x4_MUL_UN8x4_ADD_UN8x4_MUL_UN8(x, a, y, b) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, r3__, t__; \
|
|
\
|
|
r1__ = (x); \
|
|
r2__ = (a); \
|
|
UN8_rb_MUL_UN8_rb (r1__, r2__, t__); \
|
|
r2__ = (y); \
|
|
UN8_rb_MUL_UN8 (r2__, (b), t__); \
|
|
UN8_rb_ADD_UN8_rb (r1__, r2__, t__); \
|
|
\
|
|
r2__ = (x) >> G_SHIFT; \
|
|
r3__ = (a) >> G_SHIFT; \
|
|
UN8_rb_MUL_UN8_rb (r2__, r3__, t__); \
|
|
r3__ = (y) >> G_SHIFT; \
|
|
UN8_rb_MUL_UN8 (r3__, (b), t__); \
|
|
UN8_rb_ADD_UN8_rb (r2__, r3__, t__); \
|
|
\
|
|
x = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
|
|
/*
|
|
x_c = min(x_c + y_c, 255)
|
|
*/
|
|
#ifndef UN8x4_ADD_UN8x4
|
|
#define UN8x4_ADD_UN8x4(x, y) \
|
|
do \
|
|
{ \
|
|
uint32_t r1__, r2__, r3__, t__; \
|
|
\
|
|
r1__ = (x) & RB_MASK; \
|
|
r2__ = (y) & RB_MASK; \
|
|
UN8_rb_ADD_UN8_rb (r1__, r2__, t__); \
|
|
\
|
|
r2__ = ((x) >> G_SHIFT) & RB_MASK; \
|
|
r3__ = ((y) >> G_SHIFT) & RB_MASK; \
|
|
UN8_rb_ADD_UN8_rb (r2__, r3__, t__); \
|
|
\
|
|
x = r1__ | (r2__ << G_SHIFT); \
|
|
} while (0)
|
|
#endif
|