summaryrefslogtreecommitdiffstats
path: root/drivers/video/fb_draw.h
blob: cdafbe14ef1fa511bf97f82efb3af88064ae9f55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
#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 */
OpenPOWER on IntegriCloud