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