Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.9 / 779121e9f17525769c04a00475fd85600c8c04eb / . / drivers / video / fb_draw.h
blob: 816843f06bb7b19c46b81d38d5c2da2575054d2a [file] [log] [blame]
Antonino A. Daplasdc0e6e02007-05-08 00:39:08 -0700[diff] [blame]1#ifndef _FB_DRAW_H
2#define _FB_DRAW_H
3
4#include <asm/types.h>
Pavel Pisa779121e2007-10-16 01:29:21 -0700[diff] [blame^]5#include <linux/fb.h>
Antonino A. Daplasdc0e6e02007-05-08 00:39:08 -0700[diff] [blame]6
7 /*
8 * Compose two values, using a bitmask as decision value
9 * This is equivalent to (a & mask) | (b & ~mask)
10 */
11
12static inline unsigned long
13comp(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
23static inline unsigned long
24pixel_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
48static inline unsigned long
49pixel_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
Pavel Pisa779121e2007-10-16 01:29:21 -0700[diff] [blame^]73
74#ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
75
76static inline u32 fb_shifted_pixels_mask_u32(u32 index, u32 bswapmask)
77{
78 u32 mask;
79
80 if (!bswapmask) {
81 mask = FB_SHIFT_HIGH(~(u32)0, index);
82 } else {
83 mask = 0xff << FB_LEFT_POS(8);
84 mask = FB_SHIFT_LOW(mask, index & (bswapmask)) & mask;
85 mask = FB_SHIFT_HIGH(mask, index & ~(bswapmask));
86#if defined(__i386__) || defined(__x86_64__)
87 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
88 if(index + bswapmask < 32)
89#endif
90 mask |= FB_SHIFT_HIGH(~(u32)0,
91 (index + bswapmask) & ~(bswapmask));
92 }
93 return mask;
94}
95
96static inline unsigned long fb_shifted_pixels_mask_long(u32 index, u32 bswapmask)
97{
98 unsigned long mask;
99
100 if (!bswapmask) {
101 mask = FB_SHIFT_HIGH(~0UL, 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 < BITS_PER_LONG)
109#endif
110 mask |= FB_SHIFT_HIGH(~0UL,
111 (index + bswapmask) & ~(bswapmask));
112 }
113 return mask;
114}
115
116
117static inline u32 fb_compute_bswapmask(struct fb_info *info)
118{
119 u32 bswapmask = 0;
120 unsigned bpp = info->var.bits_per_pixel;
121
122 if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
123 /*
124 * Reversed order of pixel layout in bytes
125 * works only for 1, 2 and 4 bpp
126 */
127 bswapmask = 7 - bpp + 1;
128 }
129 return bswapmask;
130}
131
132#else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
133
134#define fb_shifted_pixels_mask_u32(i, b) FB_SHIFT_HIGH(~(u32)0, (i))
135#define fb_shifted_pixels_mask_long(i, b) FB_SHIFT_HIGH(~0UL, (i))
136#define fb_compute_bswapmask(...) 0
137
138#endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
139
Antonino A. Daplasdc0e6e02007-05-08 00:39:08 -0700[diff] [blame]140#endif /* FB_DRAW_H */