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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 | |
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 */ |