atafb_iplan2p8.c

  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
 30void 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
241void 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
287void 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}