1 #ifndef _FB_DRAW_H
2 #define _FB_DRAW_H
3
4 #include <asm/types.h>
5 #include <linux/fb.h>
6 #include <linux/bug.h>
7
8 /*
9 * Compose two values, using a bitmask as decision value
10 * This is equivalent to (a & mask) | (b & ~mask)
11 */
12
13 static inline unsigned long
comp(unsigned long a,unsigned long b,unsigned long mask)14 comp(unsigned long a, unsigned long b, unsigned long mask)
15 {
16 return ((a ^ b) & mask) ^ b;
17 }
18
19 /*
20 * Create a pattern with the given pixel's color
21 */
22
23 #if BITS_PER_LONG == 64
24 static inline unsigned long
pixel_to_pat(u32 bpp,u32 pixel)25 pixel_to_pat( u32 bpp, u32 pixel)
26 {
27 switch (bpp) {
28 case 1:
29 return 0xfffffffffffffffful*pixel;
30 case 2:
31 return 0x5555555555555555ul*pixel;
32 case 4:
33 return 0x1111111111111111ul*pixel;
34 case 8:
35 return 0x0101010101010101ul*pixel;
36 case 12:
37 return 0x1001001001001001ul*pixel;
38 case 16:
39 return 0x0001000100010001ul*pixel;
40 case 24:
41 return 0x0001000001000001ul*pixel;
42 case 32:
43 return 0x0000000100000001ul*pixel;
44 default:
45 WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
46 return 0;
47 }
48 }
49 #else
50 static inline unsigned long
pixel_to_pat(u32 bpp,u32 pixel)51 pixel_to_pat( u32 bpp, u32 pixel)
52 {
53 switch (bpp) {
54 case 1:
55 return 0xfffffffful*pixel;
56 case 2:
57 return 0x55555555ul*pixel;
58 case 4:
59 return 0x11111111ul*pixel;
60 case 8:
61 return 0x01010101ul*pixel;
62 case 12:
63 return 0x01001001ul*pixel;
64 case 16:
65 return 0x00010001ul*pixel;
66 case 24:
67 return 0x01000001ul*pixel;
68 case 32:
69 return 0x00000001ul*pixel;
70 default:
71 WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
72 return 0;
73 }
74 }
75 #endif
76
77 #ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
78 #if BITS_PER_LONG == 64
79 #define REV_PIXELS_MASK1 0x5555555555555555ul
80 #define REV_PIXELS_MASK2 0x3333333333333333ul
81 #define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
82 #else
83 #define REV_PIXELS_MASK1 0x55555555ul
84 #define REV_PIXELS_MASK2 0x33333333ul
85 #define REV_PIXELS_MASK4 0x0f0f0f0ful
86 #endif
87
fb_rev_pixels_in_long(unsigned long val,u32 bswapmask)88 static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
89 u32 bswapmask)
90 {
91 if (bswapmask & 1)
92 val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
93 if (bswapmask & 2)
94 val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
95 if (bswapmask & 3)
96 val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
97 return val;
98 }
99
fb_shifted_pixels_mask_u32(struct fb_info * p,u32 index,u32 bswapmask)100 static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
101 u32 bswapmask)
102 {
103 u32 mask;
104
105 if (!bswapmask) {
106 mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
107 } else {
108 mask = 0xff << FB_LEFT_POS(p, 8);
109 mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
110 mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
111 #if defined(__i386__) || defined(__x86_64__)
112 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
113 if(index + bswapmask < 32)
114 #endif
115 mask |= FB_SHIFT_HIGH(p, ~(u32)0,
116 (index + bswapmask) & ~(bswapmask));
117 }
118 return mask;
119 }
120
fb_shifted_pixels_mask_long(struct fb_info * p,u32 index,u32 bswapmask)121 static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
122 u32 index,
123 u32 bswapmask)
124 {
125 unsigned long mask;
126
127 if (!bswapmask) {
128 mask = FB_SHIFT_HIGH(p, ~0UL, index);
129 } else {
130 mask = 0xff << FB_LEFT_POS(p, 8);
131 mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
132 mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
133 #if defined(__i386__) || defined(__x86_64__)
134 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
135 if(index + bswapmask < BITS_PER_LONG)
136 #endif
137 mask |= FB_SHIFT_HIGH(p, ~0UL,
138 (index + bswapmask) & ~(bswapmask));
139 }
140 return mask;
141 }
142
143
fb_compute_bswapmask(struct fb_info * info)144 static inline u32 fb_compute_bswapmask(struct fb_info *info)
145 {
146 u32 bswapmask = 0;
147 unsigned bpp = info->var.bits_per_pixel;
148
149 if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
150 /*
151 * Reversed order of pixel layout in bytes
152 * works only for 1, 2 and 4 bpp
153 */
154 bswapmask = 7 - bpp + 1;
155 }
156 return bswapmask;
157 }
158
159 #else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
160
fb_rev_pixels_in_long(unsigned long val,u32 bswapmask)161 static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
162 u32 bswapmask)
163 {
164 return val;
165 }
166
167 #define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
168 #define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
169 #define fb_compute_bswapmask(...) 0
170
171 #endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
172
173 #define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
174 #define _cpu_to_le_long(x) __cpu_to_le_long(x)
175 #define __cpu_to_le_long(x) cpu_to_le##x
176
177 #define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
178 #define _le_long_to_cpu(x) __le_long_to_cpu(x)
179 #define __le_long_to_cpu(x) le##x##_to_cpu
180
rolx(unsigned long word,unsigned int shift,unsigned int x)181 static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
182 {
183 return (word << shift) | (word >> (x - shift));
184 }
185
186 #endif /* FB_DRAW_H */
187