atafb_iplan2p2.c

  1/*
  2 *  linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for
  3 *				      interleaved bitplanes à la Atari (2
  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	2
 21#include "atafb_utils.h"
 22
 23void atafb_iplan2p2_copyarea(struct fb_info *info, u_long next_line,
 24			     int sy, int sx, int dy, int dx,
 25			     int height, int width)
 26{
 27	/*  bmove() has to distinguish two major cases: If both, source and
 28	 *  destination, start at even addresses or both are at odd
 29	 *  addresses, just the first odd and last even column (if present)
 30	 *  require special treatment (memmove_col()). The rest between
 31	 *  then can be copied by normal operations, because all adjacent
 32	 *  bytes are affected and are to be stored in the same order.
 33	 *    The pathological case is when the move should go from an odd
 34	 *  address to an even or vice versa. Since the bytes in the plane
 35	 *  words must be assembled in new order, it seems wisest to make
 36	 *  all movements by memmove_col().
 37	 */
 38
 39	u8 *src, *dst;
 40	u32 *s, *d;
 41	int w, l , i, j;
 42	u_int colsize;
 43	u_int upwards = (dy < sy) || (dy == sy && dx < sx);
 44
 45	colsize = height;
 46	if (!((sx ^ dx) & 15)) {
 47		/* odd->odd or even->even */
 48
 49		if (upwards) {
 50			src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
 51			dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
 52			if (sx & 15) {
 53				memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
 54				src += BPL * 2;
 55				dst += BPL * 2;
 56				width -= 8;
 57			}
 58			w = width >> 4;
 59			if (w) {
 60				s = (u32 *)src;
 61				d = (u32 *)dst;
 62				w *= BPL / 2;
 63				l = next_line - w * 4;
 64				for (j = height; j > 0; j--) {
 65					for (i = w; i > 0; i--)
 66						*d++ = *s++;
 67					s = (u32 *)((u8 *)s + l);
 68					d = (u32 *)((u8 *)d + l);
 69				}
 70			}
 71			if (width & 15)
 72				memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
 73					      0xff00ff00, height, next_line - BPL * 2);
 74		} else {
 75			src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
 76			dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
 77
 78			if ((sx + width) & 15) {
 79				src -= BPL * 2;
 80				dst -= BPL * 2;
 81				memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
 82				width -= 8;
 83			}
 84			w = width >> 4;
 85			if (w) {
 86				s = (u32 *)src;
 87				d = (u32 *)dst;
 88				w *= BPL / 2;
 89				l = next_line - w * 4;
 90				for (j = height; j > 0; j--) {
 91					for (i = w; i > 0; i--)
 92						*--d = *--s;
 93					s = (u32 *)((u8 *)s - l);
 94					d = (u32 *)((u8 *)d - l);
 95				}
 96			}
 97			if (sx & 15)
 98				memmove32_col(dst - (width - 16) / (8 / BPL),
 99					      src - (width - 16) / (8 / BPL),
100					      0xff00ff, colsize, -next_line - BPL * 2);
101		}
102	} else {
103		/* odd->even or even->odd */
104		if (upwards) {
105			u32 *src32, *dst32;
106			u32 pval[4], v, v1, mask;
107			int i, j, w, f;
108
109			src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
110			dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
111
112			mask = 0xff00ff00;
113			f = 0;
114			w = width;
115			if (sx & 15) {
116				f = 1;
117				w += 8;
118			}
119			if ((sx + width) & 15)
120				f |= 2;
121			w >>= 4;
122			for (i = height; i; i--) {
123				src32 = (u32 *)src;
124				dst32 = (u32 *)dst;
125
126				if (f & 1) {
127					pval[0] = (*src32++ << 8) & mask;
128				} else {
129					pval[0] = dst32[0] & mask;
130				}
131
132				for (j = w; j > 0; j--) {
133					v = *src32++;
134					v1 = v & mask;
135					*dst32++ = pval[0] | (v1 >> 8);
136					pval[0] = (v ^ v1) << 8;
137				}
138
139				if (f & 2) {
140					dst32[0] = (dst32[0] & mask) | pval[0];
141				}
142
143				src += next_line;
144				dst += next_line;
145			}
146		} else {
147			u32 *src32, *dst32;
148			u32 pval[4], v, v1, mask;
149			int i, j, w, f;
150
151			src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
152			dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
153
154			mask = 0xff00ff;
155			f = 0;
156			w = width;
157			if ((dx + width) & 15)
158				f = 1;
159			if (sx & 15) {
160				f |= 2;
161				w += 8;
162			}
163			w >>= 4;
164			for (i = height; i; i--) {
165				src32 = (u32 *)src;
166				dst32 = (u32 *)dst;
167
168				if (f & 1) {
169					pval[0] = dst32[-1] & mask;
170				} else {
171					pval[0] = (*--src32 >> 8) & mask;
172				}
173
174				for (j = w; j > 0; j--) {
175					v = *--src32;
176					v1 = v & mask;
177					*--dst32 = pval[0] | (v1 << 8);
178					pval[0] = (v ^ v1) >> 8;
179				}
180
181				if (!(f & 2)) {
182					dst32[-1] = (dst32[-1] & mask) | pval[0];
183				}
184
185				src -= next_line;
186				dst -= next_line;
187			}
188		}
189	}
190}
191
192void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color,
193                             int sy, int sx, int height, int width)
194{
195	u32 *dest;
196	int rows, i;
197	u32 cval[4];
198
199	dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
200	if (sx & 15) {
201		u8 *dest8 = (u8 *)dest + 1;
202
203		expand8_col2mask(color, cval);
204
205		for (i = height; i; i--) {
206			fill8_col(dest8, cval);
207			dest8 += next_line;
208		}
209		dest += BPL / 2;
210		width -= 8;
211	}
212
213	expand16_col2mask(color, cval);
214	rows = width >> 4;
215	if (rows) {
216		u32 *d = dest;
217		u32 off = next_line - rows * BPL * 2;
218		for (i = height; i; i--) {
219			d = fill16_col(d, rows, cval);
220			d = (u32 *)((long)d + off);
221		}
222		dest += rows * BPL / 2;
223		width &= 15;
224	}
225
226	if (width) {
227		u8 *dest8 = (u8 *)dest;
228
229		expand8_col2mask(color, cval);
230
231		for (i = height; i; i--) {
232			fill8_col(dest8, cval);
233			dest8 += next_line;
234		}
235	}
236}
237
238void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line,
239                             int dy, int dx, u32 width,
240                             const u8 *data, u32 bgcolor, u32 fgcolor)
241{
242	u32 *dest;
243	const u16 *data16;
244	int rows;
245	u32 fgm[4], bgm[4], m;
246
247	dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
248	if (dx & 15) {
249		fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
250		dest += BPL / 2;
251		width -= 8;
252	}
253
254	if (width >= 16) {
255		data16 = (const u16 *)data;
256		expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
257
258		for (rows = width / 16; rows; rows--) {
259			u16 d = *data16++;
260			m = d | ((u32)d << 16);
261			*dest++ = (m & fgm[0]) ^ bgm[0];
262		}
263
264		data = (const u8 *)data16;
265		width &= 15;
266	}
267
268	if (width)
269		fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
270}