Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef _FB_DRAW_H
3 : #define _FB_DRAW_H
4 :
5 : #include <asm/types.h>
6 : #include <linux/fb.h>
7 : #include <linux/bug.h>
8 :
9 : /*
10 : * Compose two values, using a bitmask as decision value
11 : * This is equivalent to (a & mask) | (b & ~mask)
12 : */
13 :
14 : static inline unsigned long
15 : comp(unsigned long a, unsigned long b, unsigned long mask)
16 : {
17 0 : return ((a ^ b) & mask) ^ b;
18 : }
19 :
20 : /*
21 : * Create a pattern with the given pixel's color
22 : */
23 :
24 : #if BITS_PER_LONG == 64
25 : static inline unsigned long
26 0 : pixel_to_pat( u32 bpp, u32 pixel)
27 : {
28 0 : switch (bpp) {
29 : case 1:
30 0 : return 0xfffffffffffffffful*pixel;
31 : case 2:
32 0 : return 0x5555555555555555ul*pixel;
33 : case 4:
34 0 : return 0x1111111111111111ul*pixel;
35 : case 8:
36 0 : return 0x0101010101010101ul*pixel;
37 : case 12:
38 0 : return 0x1001001001001001ul*pixel;
39 : case 16:
40 0 : return 0x0001000100010001ul*pixel;
41 : case 24:
42 0 : return 0x0001000001000001ul*pixel;
43 : case 32:
44 0 : return 0x0000000100000001ul*pixel;
45 : default:
46 0 : WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
47 0 : return 0;
48 : }
49 : }
50 : #else
51 : static inline unsigned long
52 : pixel_to_pat( u32 bpp, u32 pixel)
53 : {
54 : switch (bpp) {
55 : case 1:
56 : return 0xfffffffful*pixel;
57 : case 2:
58 : return 0x55555555ul*pixel;
59 : case 4:
60 : return 0x11111111ul*pixel;
61 : case 8:
62 : return 0x01010101ul*pixel;
63 : case 12:
64 : return 0x01001001ul*pixel;
65 : case 16:
66 : return 0x00010001ul*pixel;
67 : case 24:
68 : return 0x01000001ul*pixel;
69 : case 32:
70 : return 0x00000001ul*pixel;
71 : default:
72 : WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
73 : return 0;
74 : }
75 : }
76 : #endif
77 :
78 : #ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
79 : #if BITS_PER_LONG == 64
80 : #define REV_PIXELS_MASK1 0x5555555555555555ul
81 : #define REV_PIXELS_MASK2 0x3333333333333333ul
82 : #define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
83 : #else
84 : #define REV_PIXELS_MASK1 0x55555555ul
85 : #define REV_PIXELS_MASK2 0x33333333ul
86 : #define REV_PIXELS_MASK4 0x0f0f0f0ful
87 : #endif
88 :
89 : static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
90 : u32 bswapmask)
91 : {
92 : if (bswapmask & 1)
93 : val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
94 : if (bswapmask & 2)
95 : val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
96 : if (bswapmask & 3)
97 : val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
98 : return val;
99 : }
100 :
101 : static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
102 : u32 bswapmask)
103 : {
104 : u32 mask;
105 :
106 : if (!bswapmask) {
107 : mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
108 : } else {
109 : mask = 0xff << FB_LEFT_POS(p, 8);
110 : mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
111 : mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
112 : #if defined(__i386__) || defined(__x86_64__)
113 : /* Shift argument is limited to 0 - 31 on x86 based CPU's */
114 : if(index + bswapmask < 32)
115 : #endif
116 : mask |= FB_SHIFT_HIGH(p, ~(u32)0,
117 : (index + bswapmask) & ~(bswapmask));
118 : }
119 : return mask;
120 : }
121 :
122 : static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
123 : u32 index,
124 : u32 bswapmask)
125 : {
126 : unsigned long mask;
127 :
128 : if (!bswapmask) {
129 : mask = FB_SHIFT_HIGH(p, ~0UL, index);
130 : } else {
131 : mask = 0xff << FB_LEFT_POS(p, 8);
132 : mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
133 : mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
134 : #if defined(__i386__) || defined(__x86_64__)
135 : /* Shift argument is limited to 0 - 31 on x86 based CPU's */
136 : if(index + bswapmask < BITS_PER_LONG)
137 : #endif
138 : mask |= FB_SHIFT_HIGH(p, ~0UL,
139 : (index + bswapmask) & ~(bswapmask));
140 : }
141 : return mask;
142 : }
143 :
144 :
145 : static inline u32 fb_compute_bswapmask(struct fb_info *info)
146 : {
147 : u32 bswapmask = 0;
148 : unsigned bpp = info->var.bits_per_pixel;
149 :
150 : if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
151 : /*
152 : * Reversed order of pixel layout in bytes
153 : * works only for 1, 2 and 4 bpp
154 : */
155 : bswapmask = 7 - bpp + 1;
156 : }
157 : return bswapmask;
158 : }
159 :
160 : #else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
161 :
162 : static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
163 : u32 bswapmask)
164 : {
165 : return val;
166 : }
167 :
168 : #define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
169 : #define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
170 : #define fb_compute_bswapmask(...) 0
171 :
172 : #endif /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
173 :
174 : #define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
175 : #define _cpu_to_le_long(x) __cpu_to_le_long(x)
176 : #define __cpu_to_le_long(x) cpu_to_le##x
177 :
178 : #define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
179 : #define _le_long_to_cpu(x) __le_long_to_cpu(x)
180 : #define __le_long_to_cpu(x) le##x##_to_cpu
181 :
182 : static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
183 : {
184 0 : return (word << shift) | (word >> (x - shift));
185 : }
186 :
187 : #endif /* FB_DRAW_H */
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