[deliverable/linux.git] / drivers / video / fb_draw.h

#ifndef _FB_DRAW_H
#define _FB_DRAW_H

#include <asm/types.h>
#include <linux/fb.h>

    /*
     *  Compose two values, using a bitmask as decision value
     *  This is equivalent to (a & mask) | (b & ~mask)
     */

static inline unsigned long
comp(unsigned long a, unsigned long b, unsigned long mask)
{
    return ((a ^ b) & mask) ^ b;
}

    /*
     *  Create a pattern with the given pixel's color
     */

#if BITS_PER_LONG == 64
static inline unsigned long
pixel_to_pat( u32 bpp, u32 pixel)
{
	switch (bpp) {
	case 1:
		return 0xfffffffffffffffful*pixel;
	case 2:
		return 0x5555555555555555ul*pixel;
	case 4:
		return 0x1111111111111111ul*pixel;
	case 8:
		return 0x0101010101010101ul*pixel;
	case 12:
		return 0x0001001001001001ul*pixel;
	case 16:
		return 0x0001000100010001ul*pixel;
	case 24:
		return 0x0000000001000001ul*pixel;
	case 32:
		return 0x0000000100000001ul*pixel;
	default:
		panic("pixel_to_pat(): unsupported pixelformat\n");
    }
}
#else
static inline unsigned long
pixel_to_pat( u32 bpp, u32 pixel)
{
	switch (bpp) {
	case 1:
		return 0xfffffffful*pixel;
	case 2:
		return 0x55555555ul*pixel;
	case 4:
		return 0x11111111ul*pixel;
	case 8:
		return 0x01010101ul*pixel;
	case 12:
		return 0x00001001ul*pixel;
	case 16:
		return 0x00010001ul*pixel;
	case 24:
		return 0x00000001ul*pixel;
	case 32:
		return 0x00000001ul*pixel;
	default:
		panic("pixel_to_pat(): unsupported pixelformat\n");
    }
}
#endif

#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
#if BITS_PER_LONG == 64
#define REV_PIXELS_MASK1 0x5555555555555555ul
#define REV_PIXELS_MASK2 0x3333333333333333ul
#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
#else
#define REV_PIXELS_MASK1 0x55555555ul
#define REV_PIXELS_MASK2 0x33333333ul
#define REV_PIXELS_MASK4 0x0f0f0f0ful
#endif

static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
						  u32 bswapmask)
{
	if (bswapmask & 1)
		val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
	if (bswapmask & 2)
		val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
	if (bswapmask & 3)
		val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
}

static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask)
{
	u32 mask;

	if (!bswapmask) {
		mask = FB_SHIFT_HIGH(~(u32)0, index);
	} else {
		mask = 0xff << FB_LEFT_POS(8);
		mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
		mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
#if defined(__i386__) || defined(__x86_64__)
		/* Shift argument is limited to 0 - 31 on x86 based CPU's */
		if(index + bswapmask < 32)
#endif
			mask |= FB_SHIFT_HIGH(~(u32)0,
					(index + bswapmask) & ~(bswapmask));
	}
	return mask;
}

static inline unsigned long fb_shifted_pixels_mask_long(u32 index, u32 bswapmask)
{
	unsigned long mask;

	if (!bswapmask) {
		mask = FB_SHIFT_HIGH(~0UL, index);
	} else {
		mask = 0xff << FB_LEFT_POS(8);
		mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
		mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
#if defined(__i386__) || defined(__x86_64__)
		/* Shift argument is limited to 0 - 31 on x86 based CPU's */
		if(index + bswapmask < BITS_PER_LONG)
#endif
			mask |= FB_SHIFT_HIGH(~0UL,
					(index + bswapmask) & ~(bswapmask));
	}
	return mask;
}


static inline u32 fb_compute_bswapmask(struct fb_info *info)
{
	u32 bswapmask = 0;
	unsigned bpp = info->var.bits_per_pixel;

	if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
		/*
		 * Reversed order of pixel layout in bytes
		 * works only for 1, 2 and 4 bpp
		 */
		bswapmask = 7 - bpp + 1;
	}
	return bswapmask;
}

#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */

static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
						  u32 bswapmask)
{
	return val;
}

#define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i))
#define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i))
#define fb_compute_bswapmask(...) 0

#endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */

#endif /* FB_DRAW_H */
Commit	Line	Data
dc0e6e05 AD	1	#ifndef _FB_DRAW_H
	2	#define _FB_DRAW_H
	3
	4	#include <asm/types.h>
779121e9	5	#include <linux/fb.h>
dc0e6e05 AD	6
	7	/*
	8	* Compose two values, using a bitmask as decision value
	9	* This is equivalent to (a & mask) \| (b & ~mask)
	10	*/
	11
	12	static inline unsigned long
	13	comp(unsigned long a, unsigned long b, unsigned long mask)
	14	{
	15	return ((a ^ b) & mask) ^ b;
	16	}
	17
	18	/*
	19	* Create a pattern with the given pixel's color
	20	*/
	21
	22	#if BITS_PER_LONG == 64
	23	static inline unsigned long
	24	pixel_to_pat( u32 bpp, u32 pixel)
	25	{
	26	switch (bpp) {
	27	case 1:
	28	return 0xfffffffffffffffful*pixel;
	29	case 2:
	30	return 0x5555555555555555ul*pixel;
	31	case 4:
	32	return 0x1111111111111111ul*pixel;
	33	case 8:
	34	return 0x0101010101010101ul*pixel;
	35	case 12:
	36	return 0x0001001001001001ul*pixel;
	37	case 16:
	38	return 0x0001000100010001ul*pixel;
	39	case 24:
	40	return 0x0000000001000001ul*pixel;
	41	case 32:
	42	return 0x0000000100000001ul*pixel;
	43	default:
	44	panic("pixel_to_pat(): unsupported pixelformat\n");
	45	}
	46	}
	47	#else
	48	static inline unsigned long
	49	pixel_to_pat( u32 bpp, u32 pixel)
	50	{
	51	switch (bpp) {
	52	case 1:
	53	return 0xfffffffful*pixel;
	54	case 2:
	55	return 0x55555555ul*pixel;
	56	case 4:
	57	return 0x11111111ul*pixel;
	58	case 8:
	59	return 0x01010101ul*pixel;
	60	case 12:
	61	return 0x00001001ul*pixel;
	62	case 16:
	63	return 0x00010001ul*pixel;
	64	case 24:
	65	return 0x00000001ul*pixel;
	66	case 32:
	67	return 0x00000001ul*pixel;
	68	default:
	69	panic("pixel_to_pat(): unsupported pixelformat\n");
70	}
71	}
72	#endif
779121e9 PP	73
779121e9 PP	74	#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
15afdd43 PP	75	#if BITS_PER_LONG == 64
	76	#define REV_PIXELS_MASK1 0x5555555555555555ul
	77	#define REV_PIXELS_MASK2 0x3333333333333333ul
	78	#define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
	79	#else
	80	#define REV_PIXELS_MASK1 0x55555555ul
	81	#define REV_PIXELS_MASK2 0x33333333ul
	82	#define REV_PIXELS_MASK4 0x0f0f0f0ful
	83	#endif
	84
	85	static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
	86	u32 bswapmask)
	87	{
	88	if (bswapmask & 1)
	89	val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
	90	if (bswapmask & 2)
	91	val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
	92	if (bswapmask & 3)
	93	val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
	94	}
779121e9 PP	95
	96	static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask)
	97	{
	98	u32 mask;
	99
	100	if (!bswapmask) {
	101	mask = FB_SHIFT_HIGH(~(u32)0, index);
	102	} else {
	103	mask = 0xff << FB_LEFT_POS(8);
	104	mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
	105	mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
	106	#if defined(__i386__) \|\| defined(__x86_64__)
	107	/* Shift argument is limited to 0 - 31 on x86 based CPU's */
	108	if(index + bswapmask < 32)
	109	#endif
	110	mask \|= FB_SHIFT_HIGH(~(u32)0,
	111	(index + bswapmask) & ~(bswapmask));
	112	}
	113	return mask;
	114	}
	115
	116	static inline unsigned long fb_shifted_pixels_mask_long(u32 index, u32 bswapmask)
	117	{
	118	unsigned long mask;
	119
	120	if (!bswapmask) {
	121	mask = FB_SHIFT_HIGH(~0UL, index);
	122	} else {
	123	mask = 0xff << FB_LEFT_POS(8);
	124	mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
	125	mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
	126	#if defined(__i386__) \|\| defined(__x86_64__)
	127	/* Shift argument is limited to 0 - 31 on x86 based CPU's */
	128	if(index + bswapmask < BITS_PER_LONG)
	129	#endif
	130	mask \|= FB_SHIFT_HIGH(~0UL,
	131	(index + bswapmask) & ~(bswapmask));
	132	}
	133	return mask;
	134	}
	135
	136
	137	static inline u32 fb_compute_bswapmask(struct fb_info *info)
	138	{
	139	u32 bswapmask = 0;
	140	unsigned bpp = info->var.bits_per_pixel;
	141
	142	if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
	143	/*
	144	* Reversed order of pixel layout in bytes
	145	* works only for 1, 2 and 4 bpp
	146	*/
	147	bswapmask = 7 - bpp + 1;
	148	}
	149	return bswapmask;
	150	}
	151
	152	#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
	153
15afdd43 PP	154	static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
	155	u32 bswapmask)
	156	{
	157	return val;
	158	}
	159
779121e9 PP	160	#define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i))
	161	#define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i))
	162	#define fb_compute_bswapmask(...) 0
	163
	164	#endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
	165
dc0e6e05	166	#endif /* FB_DRAW_H */