pixman-private.h

嵌入式图形库

#define FbGen(x,y,i,ax,ay,t,u,v) ((t) = (FbIntMult(FbGet8(y,i),ay,(u)) + \
					 FbIntMult(FbGet8(x,i),ax,(v))), \
				  (uint32_t) ((uint8_t) ((t) |		\
							 (0 - ((t) >> 8)))) << (i))

#define FbAdd(x,y,i,t)	((t) = FbGet8(x,i) + FbGet8(y,i),		\
			 (uint32_t) ((uint8_t) ((t) | (0 - ((t) >> 8)))) << (i))


/*
  The methods below use some tricks to be able to do two color
  components at the same time.
*/

/*
  x_c = (x_c * a) / 255
*/
#define FbByteMul(x, a) do {					    \
        uint32_t t = ((x & 0xff00ff) * a) + 0x800080;               \
        t = (t + ((t >> 8) & 0xff00ff)) >> 8;			    \
        t &= 0xff00ff;						    \
								    \
        x = (((x >> 8) & 0xff00ff) * a) + 0x800080;		    \
        x = (x + ((x >> 8) & 0xff00ff));			    \
        x &= 0xff00ff00;					    \
        x += t;							    \
    } while (0)

/*
  x_c = (x_c * a) / 255 + y
*/
#define FbByteMulAdd(x, a, y) do {				    \
        uint32_t t = ((x & 0xff00ff) * a) + 0x800080;               \
        t = (t + ((t >> 8) & 0xff00ff)) >> 8;			    \
        t &= 0xff00ff;						    \
        t += y & 0xff00ff;					    \
        t |= 0x1000100 - ((t >> 8) & 0xff00ff);			    \
        t &= 0xff00ff;						    \
								    \
        x = (((x >> 8) & 0xff00ff) * a) + 0x800080;                 \
        x = (x + ((x >> 8) & 0xff00ff)) >> 8;                       \
        x &= 0xff00ff;                                              \
        x += (y >> 8) & 0xff00ff;                                   \
        x |= 0x1000100 - ((x >> 8) & 0xff00ff);                     \
        x &= 0xff00ff;                                              \
        x <<= 8;                                                    \
        x += t;                                                     \
    } while (0)

/*
  x_c = (x_c * a + y_c * b) / 255
*/
#define FbByteAddMul(x, a, y, b) do {                                   \
        uint32_t t;							\
        uint32_t r = (x >> 24) * a + (y >> 24) * b + 0x80;		\
        r += (r >> 8);                                                  \
        r >>= 8;                                                        \
									\
        t = (x & 0xff00) * a + (y & 0xff00) * b;                        \
        t += (t >> 8) + 0x8000;                                         \
        t >>= 16;                                                       \
									\
        t |= r << 16;                                                   \
        t |= 0x1000100 - ((t >> 8) & 0xff00ff);                         \
        t &= 0xff00ff;                                                  \
        t <<= 8;                                                        \
									\
        r = ((x >> 16) & 0xff) * a + ((y >> 16) & 0xff) * b + 0x80;     \
        r += (r >> 8);                                                  \
        r >>= 8;                                                        \
									\
        x = (x & 0xff) * a + (y & 0xff) * b + 0x80;                     \
        x += (x >> 8);                                                  \
        x >>= 8;                                                        \
        x |= r << 16;                                                   \
        x |= 0x1000100 - ((x >> 8) & 0xff00ff);                         \
        x &= 0xff00ff;                                                  \
        x |= t;                                                         \
    } while (0)

/*
  x_c = (x_c * a + y_c *b) / 256
*/
#define FbByteAddMul_256(x, a, y, b) do {                               \
        uint32_t t = (x & 0xff00ff) * a + (y & 0xff00ff) * b;		\
        t >>= 8;                                                        \
        t &= 0xff00ff;                                                  \
									\
        x = ((x >> 8) & 0xff00ff) * a + ((y >> 8) & 0xff00ff) * b;      \
        x &= 0xff00ff00;                                                \
        x += t;                                                         \
    } while (0)

/*
  x_c = (x_c * a_c) / 255
*/
#define FbByteMulC(x, a) do {				  \
        uint32_t t;                                       \
        uint32_t r = (x & 0xff) * (a & 0xff);             \
        r |= (x & 0xff0000) * ((a >> 16) & 0xff);	  \
	r += 0x800080;					  \
        r = (r + ((r >> 8) & 0xff00ff)) >> 8;		  \
        r &= 0xff00ff;					  \
							  \
        x >>= 8;					  \
        t = (x & 0xff) * ((a >> 8) & 0xff);		  \
        t |= (x & 0xff0000) * (a >> 24);		  \
        t += 0x800080;					  \
        t = t + ((t >> 8) & 0xff00ff);			  \
        x = r | (t & 0xff00ff00);			  \
							  \
    } while (0)

/*
  x_c = (x_c * a) / 255 + y
*/
#define FbByteMulAddC(x, a, y) do {				      \
        uint32_t t;                                                   \
        uint32_t r = (x & 0xff) * (a & 0xff);                         \
        r |= (x & 0xff0000) * ((a >> 16) & 0xff);		      \
	r += 0x800080;						      \
	r = (r + ((r >> 8) & 0xff00ff)) >> 8;			      \
        r &= 0xff00ff;						      \
        r += y & 0xff00ff;					      \
        r |= 0x1000100 - ((r >> 8) & 0xff00ff);			      \
        r &= 0xff00ff;						      \
								      \
        x >>= 8;                                                       \
        t = (x & 0xff) * ((a >> 8) & 0xff);                            \
        t |= (x & 0xff0000) * (a >> 24);                               \
	t += 0x800080;                                                 \
        t = (t + ((t >> 8) & 0xff00ff)) >> 8;			       \
        t &= 0xff00ff;                                                 \
        t += (y >> 8) & 0xff00ff;                                      \
        t |= 0x1000100 - ((t >> 8) & 0xff00ff);                        \
        t &= 0xff00ff;                                                 \
        x = r | (t << 8);                                              \
    } while (0)

/*
  x_c = (x_c * a_c + y_c * b) / 255
*/
#define FbByteAddMulC(x, a, y, b) do {                                  \
        uint32_t t;							\
        uint32_t r = (x >> 24) * (a >> 24) + (y >> 24) * b;		\
        r += (r >> 8) + 0x80;                                           \
        r >>= 8;                                                        \
									\
        t = (x & 0xff00) * ((a >> 8) & 0xff) + (y & 0xff00) * b;        \
        t += (t >> 8) + 0x8000;                                         \
        t >>= 16;                                                       \
									\
        t |= r << 16;                                                   \
        t |= 0x1000100 - ((t >> 8) & 0xff00ff);                         \
        t &= 0xff00ff;                                                  \
        t <<= 8;                                                        \
									\
        r = ((x >> 16) & 0xff) * ((a >> 16) & 0xff) + ((y >> 16) & 0xff) * b + 0x80; \
        r += (r >> 8);                                                  \
        r >>= 8;                                                        \
									\
        x = (x & 0xff) * (a & 0xff) + (y & 0xff) * b + 0x80;            \
        x += (x >> 8);                                                  \
        x >>= 8;                                                        \
        x |= r << 16;                                                   \
        x |= 0x1000100 - ((x >> 8) & 0xff00ff);                         \
        x &= 0xff00ff;                                                  \
        x |= t;                                                         \
    } while (0)

/*
  x_c = min(x_c + y_c, 255)
*/
#define FbByteAdd(x, y) do {                                            \
        uint32_t t;							\
        uint32_t r = (x & 0xff00ff) + (y & 0xff00ff);			\
        r |= 0x1000100 - ((r >> 8) & 0xff00ff);                         \
        r &= 0xff00ff;                                                  \
									\
        t = ((x >> 8) & 0xff00ff) + ((y >> 8) & 0xff00ff);              \
        t |= 0x1000100 - ((t >> 8) & 0xff00ff);                         \
        r |= (t & 0xff00ff) << 8;                                       \
        x = r;                                                          \
    } while (0)

#define div_255(x) (((x) + 0x80 + (((x) + 0x80) >> 8)) >> 8)

#define MOD(a,b) ((a) < 0 ? ((b) - ((-(a) - 1) % (b))) - 1 : (a) % (b))

#define DIV(a,b) ((((a) < 0) == ((b) < 0)) ? (a) / (b) :		\
		  ((a) - (b) + 1 - (((b) < 0) << 1)) / (b))

#define CLIP(a,b,c) ((a) < (b) ? (b) : ((a) > (c) ? (c) : (a)))

#if 0
/* FIXME: the MOD macro above is equivalent, but faster I think */
#define mod(a,b) ((b) == 1 ? 0 : (a) >= 0 ? (a) % (b) : (b) - (-a) % (b))
#endif

/* FIXME: the (void)__read_func hides lots of warnings (which is what they
 * are supposed to do), but some of them are real. For example the one
 * where Fetch4 doesn't have a READ
 */

#if 0
/* Framebuffer access support macros */
#define ACCESS_MEM(code)						\
    do {								\
	const image_common_t *const com__ =				\
	    (image_common_t *)image;					\
									\
	if (!com__->read_func && !com__->write_func)			\
	{								\
	    const int do_access__ = 0;					\
	    const pixman_read_memory_func_t read_func__ = NULL;		\
	    const pixman_write_memory_func_t write_func__ = NULL;	\
	    (void)read_func__;						\
	    (void)write_func__;						\
	    (void)do_access__;						\
									\
	    {code}							\
	}								\
	else								\
	{								\
	    const int do_access__ = 1;					\
	    const pixman_read_memory_func_t read_func__ =		\
		com__->read_func;					\
	    const pixman_write_memory_func_t write_func__ =		\
		com__->write_func;					\
	    (void)read_func__;						\
	    (void)write_func__;						\
	    (void)do_access__;						\
	    								\
	    {code}							\
	}								\
    } while (0)
#endif

#ifdef PIXMAN_FB_ACCESSORS

#define READ(img, ptr)							\
    ((img)->common.read_func ((ptr), sizeof(*(ptr))))
#define WRITE(img, ptr,val)						\
    ((img)->common.write_func ((ptr), (val), sizeof (*(ptr))))

#define MEMCPY_WRAPPED(img, dst, src, size)				\
    do {								\
	size_t _i;							\
	uint8_t *_dst = (uint8_t*)(dst), *_src = (uint8_t*)(src);	\
	for(_i = 0; _i < size; _i++) {					\
	    WRITE((img), _dst +_i, READ((img), _src + _i));		\
	}								\
    } while (0)

#define MEMSET_WRAPPED(img, dst, val, size)				\
    do {								\
	size_t _i;							\
	uint8_t *_dst = (uint8_t*)(dst);				\
	for(_i = 0; _i < (size_t) size; _i++) {				\
	    WRITE((img), _dst +_i, (val));				\
	}								\
    } while (0)

#else

#define READ(img, ptr)		(*(ptr))
#define WRITE(img, ptr, val)	(*(ptr) = (val))
#define MEMCPY_WRAPPED(img, dst, src, size)					\
    memcpy(dst, src, size)
#define MEMSET_WRAPPED(img, dst, val, size)					\
    memset(dst, val, size)

#endif

#define fbComposeGetSolid(img, res, fmt)				\
    do									\
    {									\
	pixman_format_code_t format__;					\
	if (img->type == SOLID)						\
	{								\
	    format__ = PIXMAN_a8r8g8b8;					\
	    (res) = img->solid.color;					\
	}								\
	else								\
	{								\
	    uint32_t	       *bits__   = (img)->bits.bits;		\
	    format__ = (img)->bits.format;				\
		  							\
	    switch (PIXMAN_FORMAT_BPP((img)->bits.format))		\
	    {								\
	    case 32:							\
		(res) = READ(img, (uint32_t *)bits__);			\
		break;							\
	    case 24:							\
		(res) = Fetch24(img, (uint8_t *) bits__);			\
		break;							\
	    case 16:							\
		(res) = READ(img, (uint16_t *) bits__);			\
		(res) = cvt0565to0888(res);				\
		break;							\
	    case 8:							\
		(res) = READ(img, (uint8_t *) bits__);			\
		(res) = (res) << 24;					\
		break;							\
	    case 1:							\
		(res) = READ(img, (uint32_t *) bits__);			\
		(res) = FbLeftStipBits((res),1) ? 0xff000000 : 0x00000000; \
		break;							\
	    default:							\
		return;							\
	    }								\
	    /* manage missing src alpha */				\
	    if (!PIXMAN_FORMAT_A((img)->bits.format))			\
		(res) |= 0xff000000;					\
	}								\
									\
	/* If necessary, convert RGB <--> BGR. */			\
	if (PIXMAN_FORMAT_TYPE (format__) != PIXMAN_FORMAT_TYPE(fmt))	\
	{								\
	    (res) = ((((res) & 0xff000000) >>  0) |			\
		     (((res) & 0x00ff0000) >> 16) |			\
		     (((res) & 0x0000ff00) >>  0) |			\
		     (((res) & 0x000000ff) << 16));			\
	}								\
    }									\
    while (0)

#define fbComposeGetStart(pict,x,y,type,out_stride,line,mul) do {	\
	uint32_t	*__bits__;					\
	int		__stride__;					\
	int		__bpp__;					\
									\
	__bits__ = pict->bits.bits;					\
	__stride__ = pict->bits.rowstride;				\
	__bpp__ = PIXMAN_FORMAT_BPP(pict->bits.format);			\
	(out_stride) = __stride__ * (int) sizeof (uint32_t) / (int) sizeof (type);	\
	(line) = ((type *) __bits__) +					\
	    (out_stride) * (y) + (mul) * (x);				\
    } while (0)


/*
 * Edges
 */

#define MAX_ALPHA(n)	((1 << (n)) - 1)
#define N_Y_FRAC(n)	((n) == 1 ? 1 : (1 << ((n)/2)) - 1)
#define N_X_FRAC(n)	((n) == 1 ? 1 : (1 << ((n)/2)) + 1)

#define STEP_Y_SMALL(n)	(pixman_fixed_1 / N_Y_FRAC(n))
#define STEP_Y_BIG(n)	(pixman_fixed_1 - (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))

#define Y_FRAC_FIRST(n)	(STEP_Y_SMALL(n) / 2)
#define Y_FRAC_LAST(n)	(Y_FRAC_FIRST(n) + (N_Y_FRAC(n) - 1) * STEP_Y_SMALL(n))

#define STEP_X_SMALL(n)	(pixman_fixed_1 / N_X_FRAC(n))
#define STEP_X_BIG(n)	(pixman_fixed_1 - (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))

#define X_FRAC_FIRST(n)	(STEP_X_SMALL(n) / 2)
#define X_FRAC_LAST(n)	(X_FRAC_FIRST(n) + (N_X_FRAC(n) - 1) * STEP_X_SMALL(n))

#define RenderSamplesX(x,n)	((n) == 1 ? 0 : (pixman_fixed_frac (x) + X_FRAC_FIRST(n)) / STEP_X_SMALL(n))

/*
 * Step across a small sample grid gap
 */
#define RenderEdgeStepSmall(edge) { \
    edge->x += edge->stepx_small;   \
    edge->e += edge->dx_small;	    \
    if (edge->e > 0)		    \
    {				    \
	edge->e -= edge->dy;	    \
	edge->x += edge->signdx;    \
    }				    \
}

/*
 * Step across a large sample grid gap
 */
#define RenderEdgeStepBig(edge) {   \
    edge->x += edge->stepx_big;	    \
    edge->e += edge->dx_big;	    \
    if (edge->e > 0)		    \
    {				    \
	edge->e -= edge->dy;	    \
	edge->x += edge->signdx;    \
    }				    \
}

void
pixman_rasterize_edges_accessors (pixman_image_t *image,
				  pixman_edge_t	*l,
				  pixman_edge_t	*r,
				  pixman_fixed_t	t,
				  pixman_fixed_t	b);


#ifdef PIXMAN_TIMING

/* Timing */
static inline uint64_t
oil_profile_stamp_rdtsc (void)
{
    uint64_t ts;
    __asm__ __volatile__("rdtsc\n" : "=A" (ts));
    return ts;
}
#define OIL_STAMP oil_profile_stamp_rdtsc

typedef struct PixmanTimer PixmanTimer;

struct PixmanTimer
{
    int initialized;
    const char *name;
    uint64_t n_times;
    uint64_t total;
    PixmanTimer *next;
};

extern int timer_defined;
void pixman_timer_register (PixmanTimer *timer);

#define TIMER_BEGIN(tname)						\
    {									\
	static PixmanTimer	timer##tname;				\
	uint64_t		begin##tname;				\
									\
	if (!timer##tname.initialized)					\
	{								\
	    timer##tname.initialized = 1;				\
	    timer##tname.name = #tname;					\
	    pixman_timer_register (&timer##tname);			\
	}								\
									\
	timer##tname.n_times++;						\
	begin##tname = OIL_STAMP();

#define TIMER_END(tname)						\
        timer##tname.total += OIL_STAMP() - begin##tname;		\
    }

#endif /* PIXMAN_TIMING */

#endif /* PIXMAN_PRIVATE_H */