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atafb_iplan2p8.c
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1 /*
2  * linux/drivers/video/iplan2p8.c -- Low level frame buffer operations for
3  * interleaved bitplanes à la Atari (8
4  * planes, 2 bytes interleave)
5  *
6  * Created 5 Apr 1997 by Geert Uytterhoeven
7  *
8  * This file is subject to the terms and conditions of the GNU General Public
9  * License. See the file COPYING in the main directory of this archive for
10  * more details.
11  */
12 
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/fb.h>
16 
17 #include <asm/setup.h>
18 
19 #include "atafb.h"
20 
21 #define BPL 8
22 #include "atafb_utils.h"
23 
24 
25 /* Copies a 8 plane column from 's', height 'h', to 'd'. */
26 
27 /* This expands a 8 bit color into two longs for two movepl (8 plane)
28  * operations.
29  */
30 
31 void atafb_iplan2p8_copyarea(struct fb_info *info, u_long next_line,
32  int sy, int sx, int dy, int dx,
33  int height, int width)
34 {
35  /* bmove() has to distinguish two major cases: If both, source and
36  * destination, start at even addresses or both are at odd
37  * addresses, just the first odd and last even column (if present)
38  * require special treatment (memmove_col()). The rest between
39  * then can be copied by normal operations, because all adjacent
40  * bytes are affected and are to be stored in the same order.
41  * The pathological case is when the move should go from an odd
42  * address to an even or vice versa. Since the bytes in the plane
43  * words must be assembled in new order, it seems wisest to make
44  * all movements by memmove_col().
45  */
46 
47  u8 *src, *dst;
48  u32 *s, *d;
49  int w, l , i, j;
50  u_int colsize;
51  u_int upwards = (dy < sy) || (dy == sy && dx < sx);
52 
53  colsize = height;
54  if (!((sx ^ dx) & 15)) {
55  /* odd->odd or even->even */
56 
57  if (upwards) {
58  src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
59  dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
60  if (sx & 15) {
61  memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
62  src += BPL * 2;
63  dst += BPL * 2;
64  width -= 8;
65  }
66  w = width >> 4;
67  if (w) {
68  s = (u32 *)src;
69  d = (u32 *)dst;
70  w *= BPL / 2;
71  l = next_line - w * 4;
72  for (j = height; j > 0; j--) {
73  for (i = w; i > 0; i--)
74  *d++ = *s++;
75  s = (u32 *)((u8 *)s + l);
76  d = (u32 *)((u8 *)d + l);
77  }
78  }
79  if (width & 15)
80  memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
81  0xff00ff00, height, next_line - BPL * 2);
82  } else {
83  src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
84  dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
85 
86  if ((sx + width) & 15) {
87  src -= BPL * 2;
88  dst -= BPL * 2;
89  memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
90  width -= 8;
91  }
92  w = width >> 4;
93  if (w) {
94  s = (u32 *)src;
95  d = (u32 *)dst;
96  w *= BPL / 2;
97  l = next_line - w * 4;
98  for (j = height; j > 0; j--) {
99  for (i = w; i > 0; i--)
100  *--d = *--s;
101  s = (u32 *)((u8 *)s - l);
102  d = (u32 *)((u8 *)d - l);
103  }
104  }
105  if (sx & 15)
106  memmove32_col(dst - (width - 16) / (8 / BPL),
107  src - (width - 16) / (8 / BPL),
108  0xff00ff, colsize, -next_line - BPL * 2);
109  }
110  } else {
111  /* odd->even or even->odd */
112  if (upwards) {
113  u32 *src32, *dst32;
114  u32 pval[4], v, v1, mask;
115  int i, j, w, f;
116 
117  src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
118  dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
119 
120  mask = 0xff00ff00;
121  f = 0;
122  w = width;
123  if (sx & 15) {
124  f = 1;
125  w += 8;
126  }
127  if ((sx + width) & 15)
128  f |= 2;
129  w >>= 4;
130  for (i = height; i; i--) {
131  src32 = (u32 *)src;
132  dst32 = (u32 *)dst;
133 
134  if (f & 1) {
135  pval[0] = (*src32++ << 8) & mask;
136  pval[1] = (*src32++ << 8) & mask;
137  pval[2] = (*src32++ << 8) & mask;
138  pval[3] = (*src32++ << 8) & mask;
139  } else {
140  pval[0] = dst32[0] & mask;
141  pval[1] = dst32[1] & mask;
142  pval[2] = dst32[2] & mask;
143  pval[3] = dst32[3] & mask;
144  }
145 
146  for (j = w; j > 0; j--) {
147  v = *src32++;
148  v1 = v & mask;
149  *dst32++ = pval[0] | (v1 >> 8);
150  pval[0] = (v ^ v1) << 8;
151  v = *src32++;
152  v1 = v & mask;
153  *dst32++ = pval[1] | (v1 >> 8);
154  pval[1] = (v ^ v1) << 8;
155  v = *src32++;
156  v1 = v & mask;
157  *dst32++ = pval[2] | (v1 >> 8);
158  pval[2] = (v ^ v1) << 8;
159  v = *src32++;
160  v1 = v & mask;
161  *dst32++ = pval[3] | (v1 >> 8);
162  pval[3] = (v ^ v1) << 8;
163  }
164 
165  if (f & 2) {
166  dst32[0] = (dst32[0] & mask) | pval[0];
167  dst32[1] = (dst32[1] & mask) | pval[1];
168  dst32[2] = (dst32[2] & mask) | pval[2];
169  dst32[3] = (dst32[3] & mask) | pval[3];
170  }
171 
172  src += next_line;
173  dst += next_line;
174  }
175  } else {
176  u32 *src32, *dst32;
177  u32 pval[4], v, v1, mask;
178  int i, j, w, f;
179 
180  src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
181  dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
182 
183  mask = 0xff00ff;
184  f = 0;
185  w = width;
186  if ((dx + width) & 15)
187  f = 1;
188  if (sx & 15) {
189  f |= 2;
190  w += 8;
191  }
192  w >>= 4;
193  for (i = height; i; i--) {
194  src32 = (u32 *)src;
195  dst32 = (u32 *)dst;
196 
197  if (f & 1) {
198  pval[0] = dst32[-1] & mask;
199  pval[1] = dst32[-2] & mask;
200  pval[2] = dst32[-3] & mask;
201  pval[3] = dst32[-4] & mask;
202  } else {
203  pval[0] = (*--src32 >> 8) & mask;
204  pval[1] = (*--src32 >> 8) & mask;
205  pval[2] = (*--src32 >> 8) & mask;
206  pval[3] = (*--src32 >> 8) & mask;
207  }
208 
209  for (j = w; j > 0; j--) {
210  v = *--src32;
211  v1 = v & mask;
212  *--dst32 = pval[0] | (v1 << 8);
213  pval[0] = (v ^ v1) >> 8;
214  v = *--src32;
215  v1 = v & mask;
216  *--dst32 = pval[1] | (v1 << 8);
217  pval[1] = (v ^ v1) >> 8;
218  v = *--src32;
219  v1 = v & mask;
220  *--dst32 = pval[2] | (v1 << 8);
221  pval[2] = (v ^ v1) >> 8;
222  v = *--src32;
223  v1 = v & mask;
224  *--dst32 = pval[3] | (v1 << 8);
225  pval[3] = (v ^ v1) >> 8;
226  }
227 
228  if (!(f & 2)) {
229  dst32[-1] = (dst32[-1] & mask) | pval[0];
230  dst32[-2] = (dst32[-2] & mask) | pval[1];
231  dst32[-3] = (dst32[-3] & mask) | pval[2];
232  dst32[-4] = (dst32[-4] & mask) | pval[3];
233  }
234 
235  src -= next_line;
236  dst -= next_line;
237  }
238  }
239  }
240 }
241 
242 void atafb_iplan2p8_fillrect(struct fb_info *info, u_long next_line, u32 color,
243  int sy, int sx, int height, int width)
244 {
245  u32 *dest;
246  int rows, i;
247  u32 cval[4];
248 
249  dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
250  if (sx & 15) {
251  u8 *dest8 = (u8 *)dest + 1;
252 
253  expand8_col2mask(color, cval);
254 
255  for (i = height; i; i--) {
256  fill8_col(dest8, cval);
257  dest8 += next_line;
258  }
259  dest += BPL / 2;
260  width -= 8;
261  }
262 
263  expand16_col2mask(color, cval);
264  rows = width >> 4;
265  if (rows) {
266  u32 *d = dest;
267  u32 off = next_line - rows * BPL * 2;
268  for (i = height; i; i--) {
269  d = fill16_col(d, rows, cval);
270  d = (u32 *)((long)d + off);
271  }
272  dest += rows * BPL / 2;
273  width &= 15;
274  }
275 
276  if (width) {
277  u8 *dest8 = (u8 *)dest;
278 
279  expand8_col2mask(color, cval);
280 
281  for (i = height; i; i--) {
282  fill8_col(dest8, cval);
283  dest8 += next_line;
284  }
285  }
286 }
287 
288 void atafb_iplan2p8_linefill(struct fb_info *info, u_long next_line,
289  int dy, int dx, u32 width,
290  const u8 *data, u32 bgcolor, u32 fgcolor)
291 {
292  u32 *dest;
293  const u16 *data16;
294  int rows;
295  u32 fgm[4], bgm[4], m;
296 
297  dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
298  if (dx & 15) {
299  fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
300  dest += BPL / 2;
301  width -= 8;
302  }
303 
304  if (width >= 16) {
305  data16 = (const u16 *)data;
306  expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
307 
308  for (rows = width / 16; rows; rows--) {
309  u16 d = *data16++;
310  m = d | ((u32)d << 16);
311  *dest++ = (m & fgm[0]) ^ bgm[0];
312  *dest++ = (m & fgm[1]) ^ bgm[1];
313  *dest++ = (m & fgm[2]) ^ bgm[2];
314  *dest++ = (m & fgm[3]) ^ bgm[3];
315  }
316 
317  data = (const u8 *)data16;
318  width &= 15;
319  }
320 
321  if (width)
322  fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
323 }
324 
325 #ifdef MODULE
326 MODULE_LICENSE("GPL");
327 
328 int init_module(void)
329 {
330  return 0;
331 }
332 
333 void cleanup_module(void)
334 {
335 }
336 #endif /* MODULE */
337 
338 
339  /*
340  * Visible symbols for modules
341  */
342 
343 EXPORT_SYMBOL(atafb_iplan2p8_copyarea);
344 EXPORT_SYMBOL(atafb_iplan2p8_fillrect);
345 EXPORT_SYMBOL(atafb_iplan2p8_linefill);
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