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1 | /* |
2 | * Generic 1-bit or 8-bit source to 1-32 bit destination expansion |
3 | * for frame buffer located in system RAM with packed pixels of any depth. |
4 | * |
5 | * Based almost entirely on cfbimgblt.c |
6 | * |
7 | * Copyright (C) April 2007 Antonino Daplas <adaplas@pol.net> |
8 | * |
9 | * This file is subject to the terms and conditions of the GNU General Public |
10 | * License. See the file COPYING in the main directory of this archive for |
11 | * more details. |
12 | */ |
13 | #include <linux/module.h> |
14 | #include <linux/string.h> |
15 | #include <linux/fb.h> |
16 | #include <asm/types.h> |
17 | |
18 | #define DEBUG |
19 | |
20 | #ifdef DEBUG |
21 | #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__func__,## args) |
22 | #else |
23 | #define DPRINTK(fmt, args...) |
24 | #endif |
25 | |
26 | static const u32 cfb_tab8_be[] = { |
27 | 0x00000000,0x000000ff,0x0000ff00,0x0000ffff, |
28 | 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff, |
29 | 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff, |
30 | 0xffff0000,0xffff00ff,0xffffff00,0xffffffff |
31 | }; |
32 | |
33 | static const u32 cfb_tab8_le[] = { |
34 | 0x00000000,0xff000000,0x00ff0000,0xffff0000, |
35 | 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00, |
36 | 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff, |
37 | 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff |
38 | }; |
39 | |
40 | static const u32 cfb_tab16_be[] = { |
41 | 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff |
42 | }; |
43 | |
44 | static const u32 cfb_tab16_le[] = { |
45 | 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff |
46 | }; |
47 | |
48 | static const u32 cfb_tab32[] = { |
49 | 0x00000000, 0xffffffff |
50 | }; |
51 | |
52 | static void color_imageblit(const struct fb_image *image, struct fb_info *p, |
53 | void *dst1, u32 start_index, u32 pitch_index) |
54 | { |
55 | /* Draw the penguin */ |
56 | u32 *dst, *dst2; |
57 | u32 color = 0, val, shift; |
58 | int i, n, bpp = p->var.bits_per_pixel; |
59 | u32 null_bits = 32 - bpp; |
60 | u32 *palette = (u32 *) p->pseudo_palette; |
61 | const u8 *src = image->data; |
62 | |
63 | dst2 = dst1; |
64 | for (i = image->height; i--; ) { |
65 | n = image->width; |
66 | dst = dst1; |
67 | shift = 0; |
68 | val = 0; |
69 | |
70 | if (start_index) { |
71 | u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0, |
72 | start_index)); |
73 | val = *dst & start_mask; |
74 | shift = start_index; |
75 | } |
76 | while (n--) { |
77 | if (p->fix.visual == FB_VISUAL_TRUECOLOR || |
78 | p->fix.visual == FB_VISUAL_DIRECTCOLOR ) |
79 | color = palette[*src]; |
80 | else |
81 | color = *src; |
82 | color <<= FB_LEFT_POS(p, bpp); |
83 | val |= FB_SHIFT_HIGH(p, color, shift); |
84 | if (shift >= null_bits) { |
85 | *dst++ = val; |
86 | |
87 | val = (shift == null_bits) ? 0 : |
88 | FB_SHIFT_LOW(p, color, 32 - shift); |
89 | } |
90 | shift += bpp; |
91 | shift &= (32 - 1); |
92 | src++; |
93 | } |
94 | if (shift) { |
95 | u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift); |
96 | |
97 | *dst &= end_mask; |
98 | *dst |= val; |
99 | } |
100 | dst1 += p->fix.line_length; |
101 | if (pitch_index) { |
102 | dst2 += p->fix.line_length; |
103 | dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1)); |
104 | |
105 | start_index += pitch_index; |
106 | start_index &= 32 - 1; |
107 | } |
108 | } |
109 | } |
110 | |
111 | static void slow_imageblit(const struct fb_image *image, struct fb_info *p, |
112 | void *dst1, u32 fgcolor, u32 bgcolor, |
113 | u32 start_index, u32 pitch_index) |
114 | { |
115 | u32 shift, color = 0, bpp = p->var.bits_per_pixel; |
116 | u32 *dst, *dst2; |
117 | u32 val, pitch = p->fix.line_length; |
118 | u32 null_bits = 32 - bpp; |
119 | u32 spitch = (image->width+7)/8; |
120 | const u8 *src = image->data, *s; |
121 | u32 i, j, l; |
122 | |
123 | dst2 = dst1; |
124 | fgcolor <<= FB_LEFT_POS(p, bpp); |
125 | bgcolor <<= FB_LEFT_POS(p, bpp); |
126 | |
127 | for (i = image->height; i--; ) { |
128 | shift = val = 0; |
129 | l = 8; |
130 | j = image->width; |
131 | dst = dst1; |
132 | s = src; |
133 | |
134 | /* write leading bits */ |
135 | if (start_index) { |
136 | u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0, |
137 | start_index)); |
138 | val = *dst & start_mask; |
139 | shift = start_index; |
140 | } |
141 | |
142 | while (j--) { |
143 | l--; |
144 | color = (*s & (1 << l)) ? fgcolor : bgcolor; |
145 | val |= FB_SHIFT_HIGH(p, color, shift); |
146 | |
147 | /* Did the bitshift spill bits to the next long? */ |
148 | if (shift >= null_bits) { |
149 | *dst++ = val; |
150 | val = (shift == null_bits) ? 0 : |
151 | FB_SHIFT_LOW(p, color, 32 - shift); |
152 | } |
153 | shift += bpp; |
154 | shift &= (32 - 1); |
155 | if (!l) { l = 8; s++; }; |
156 | } |
157 | |
158 | /* write trailing bits */ |
159 | if (shift) { |
160 | u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift); |
161 | |
162 | *dst &= end_mask; |
163 | *dst |= val; |
164 | } |
165 | |
166 | dst1 += pitch; |
167 | src += spitch; |
168 | if (pitch_index) { |
169 | dst2 += pitch; |
170 | dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1)); |
171 | start_index += pitch_index; |
172 | start_index &= 32 - 1; |
173 | } |
174 | |
175 | } |
176 | } |
177 | |
178 | /* |
179 | * fast_imageblit - optimized monochrome color expansion |
180 | * |
181 | * Only if: bits_per_pixel == 8, 16, or 32 |
182 | * image->width is divisible by pixel/dword (ppw); |
183 | * fix->line_legth is divisible by 4; |
184 | * beginning and end of a scanline is dword aligned |
185 | */ |
186 | static void fast_imageblit(const struct fb_image *image, struct fb_info *p, |
187 | void *dst1, u32 fgcolor, u32 bgcolor) |
188 | { |
189 | u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel; |
190 | u32 ppw = 32/bpp, spitch = (image->width + 7)/8; |
191 | u32 bit_mask, end_mask, eorx, shift; |
192 | const char *s = image->data, *src; |
193 | u32 *dst; |
194 | const u32 *tab = NULL; |
195 | int i, j, k; |
196 | |
197 | switch (bpp) { |
198 | case 8: |
199 | tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le; |
200 | break; |
201 | case 16: |
202 | tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le; |
203 | break; |
204 | case 32: |
205 | default: |
206 | tab = cfb_tab32; |
207 | break; |
208 | } |
209 | |
210 | for (i = ppw-1; i--; ) { |
211 | fgx <<= bpp; |
212 | bgx <<= bpp; |
213 | fgx |= fgcolor; |
214 | bgx |= bgcolor; |
215 | } |
216 | |
217 | bit_mask = (1 << ppw) - 1; |
218 | eorx = fgx ^ bgx; |
219 | k = image->width/ppw; |
220 | |
221 | for (i = image->height; i--; ) { |
222 | dst = dst1; |
223 | shift = 8; |
224 | src = s; |
225 | |
226 | for (j = k; j--; ) { |
227 | shift -= ppw; |
228 | end_mask = tab[(*src >> shift) & bit_mask]; |
229 | *dst++ = (end_mask & eorx) ^ bgx; |
230 | if (!shift) { |
231 | shift = 8; |
232 | src++; |
233 | } |
234 | } |
235 | dst1 += p->fix.line_length; |
236 | s += spitch; |
237 | } |
238 | } |
239 | |
240 | void sys_imageblit(struct fb_info *p, const struct fb_image *image) |
241 | { |
242 | u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0; |
243 | u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel; |
244 | u32 width = image->width; |
245 | u32 dx = image->dx, dy = image->dy; |
246 | void *dst1; |
247 | |
248 | if (p->state != FBINFO_STATE_RUNNING) |
249 | return; |
250 | |
251 | bitstart = (dy * p->fix.line_length * 8) + (dx * bpp); |
252 | start_index = bitstart & (32 - 1); |
253 | pitch_index = (p->fix.line_length & (bpl - 1)) * 8; |
254 | |
255 | bitstart /= 8; |
256 | bitstart &= ~(bpl - 1); |
257 | dst1 = (void __force *)p->screen_base + bitstart; |
258 | |
259 | if (p->fbops->fb_sync) |
260 | p->fbops->fb_sync(p); |
261 | |
262 | if (image->depth == 1) { |
263 | if (p->fix.visual == FB_VISUAL_TRUECOLOR || |
264 | p->fix.visual == FB_VISUAL_DIRECTCOLOR) { |
265 | fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color]; |
266 | bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color]; |
267 | } else { |
268 | fgcolor = image->fg_color; |
269 | bgcolor = image->bg_color; |
270 | } |
271 | |
272 | if (32 % bpp == 0 && !start_index && !pitch_index && |
273 | ((width & (32/bpp-1)) == 0) && |
274 | bpp >= 8 && bpp <= 32) |
275 | fast_imageblit(image, p, dst1, fgcolor, bgcolor); |
276 | else |
277 | slow_imageblit(image, p, dst1, fgcolor, bgcolor, |
278 | start_index, pitch_index); |
279 | } else |
280 | color_imageblit(image, p, dst1, start_index, pitch_index); |
281 | } |
282 | |
283 | EXPORT_SYMBOL(sys_imageblit); |
284 | |
285 | MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>"); |
286 | MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)"); |
287 | MODULE_LICENSE("GPL"); |
288 | |
289 |
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