xref: /openbmc/linux/drivers/video/fbdev/core/bitblit.c (revision d78bd6cc)
1 /*
2  *  linux/drivers/video/console/bitblit.c -- BitBlitting Operation
3  *
4  *  Originally from the 'accel_*' routines in drivers/video/console/fbcon.c
5  *
6  *      Copyright (C) 2004 Antonino Daplas <adaplas @pol.net>
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/slab.h>
15 #include <linux/string.h>
16 #include <linux/fb.h>
17 #include <linux/vt_kern.h>
18 #include <linux/console.h>
19 #include <asm/types.h>
20 #include "fbcon.h"
21 
22 /*
23  * Accelerated handlers.
24  */
update_attr(u8 * dst,u8 * src,int attribute,struct vc_data * vc)25 static void update_attr(u8 *dst, u8 *src, int attribute,
26 			       struct vc_data *vc)
27 {
28 	int i, offset = (vc->vc_font.height < 10) ? 1 : 2;
29 	int width = DIV_ROUND_UP(vc->vc_font.width, 8);
30 	unsigned int cellsize = vc->vc_font.height * width;
31 	u8 c;
32 
33 	offset = cellsize - (offset * width);
34 	for (i = 0; i < cellsize; i++) {
35 		c = src[i];
36 		if (attribute & FBCON_ATTRIBUTE_UNDERLINE && i >= offset)
37 			c = 0xff;
38 		if (attribute & FBCON_ATTRIBUTE_BOLD)
39 			c |= c >> 1;
40 		if (attribute & FBCON_ATTRIBUTE_REVERSE)
41 			c = ~c;
42 		dst[i] = c;
43 	}
44 }
45 
bit_bmove(struct vc_data * vc,struct fb_info * info,int sy,int sx,int dy,int dx,int height,int width)46 static void bit_bmove(struct vc_data *vc, struct fb_info *info, int sy,
47 		      int sx, int dy, int dx, int height, int width)
48 {
49 	struct fb_copyarea area;
50 
51 	area.sx = sx * vc->vc_font.width;
52 	area.sy = sy * vc->vc_font.height;
53 	area.dx = dx * vc->vc_font.width;
54 	area.dy = dy * vc->vc_font.height;
55 	area.height = height * vc->vc_font.height;
56 	area.width = width * vc->vc_font.width;
57 
58 	info->fbops->fb_copyarea(info, &area);
59 }
60 
bit_clear(struct vc_data * vc,struct fb_info * info,int sy,int sx,int height,int width)61 static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,
62 		      int sx, int height, int width)
63 {
64 	int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
65 	struct fb_fillrect region;
66 
67 	region.color = attr_bgcol_ec(bgshift, vc, info);
68 	region.dx = sx * vc->vc_font.width;
69 	region.dy = sy * vc->vc_font.height;
70 	region.width = width * vc->vc_font.width;
71 	region.height = height * vc->vc_font.height;
72 	region.rop = ROP_COPY;
73 
74 	info->fbops->fb_fillrect(info, &region);
75 }
76 
bit_putcs_aligned(struct vc_data * vc,struct fb_info * info,const u16 * s,u32 attr,u32 cnt,u32 d_pitch,u32 s_pitch,u32 cellsize,struct fb_image * image,u8 * buf,u8 * dst)77 static inline void bit_putcs_aligned(struct vc_data *vc, struct fb_info *info,
78 				     const u16 *s, u32 attr, u32 cnt,
79 				     u32 d_pitch, u32 s_pitch, u32 cellsize,
80 				     struct fb_image *image, u8 *buf, u8 *dst)
81 {
82 	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
83 	u32 idx = vc->vc_font.width >> 3;
84 	u8 *src;
85 
86 	while (cnt--) {
87 		src = vc->vc_font.data + (scr_readw(s++)&
88 					  charmask)*cellsize;
89 
90 		if (attr) {
91 			update_attr(buf, src, attr, vc);
92 			src = buf;
93 		}
94 
95 		if (likely(idx == 1))
96 			__fb_pad_aligned_buffer(dst, d_pitch, src, idx,
97 						image->height);
98 		else
99 			fb_pad_aligned_buffer(dst, d_pitch, src, idx,
100 					      image->height);
101 
102 		dst += s_pitch;
103 	}
104 
105 	info->fbops->fb_imageblit(info, image);
106 }
107 
bit_putcs_unaligned(struct vc_data * vc,struct fb_info * info,const u16 * s,u32 attr,u32 cnt,u32 d_pitch,u32 s_pitch,u32 cellsize,struct fb_image * image,u8 * buf,u8 * dst)108 static inline void bit_putcs_unaligned(struct vc_data *vc,
109 				       struct fb_info *info, const u16 *s,
110 				       u32 attr, u32 cnt, u32 d_pitch,
111 				       u32 s_pitch, u32 cellsize,
112 				       struct fb_image *image, u8 *buf,
113 				       u8 *dst)
114 {
115 	u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
116 	u32 shift_low = 0, mod = vc->vc_font.width % 8;
117 	u32 shift_high = 8;
118 	u32 idx = vc->vc_font.width >> 3;
119 	u8 *src;
120 
121 	while (cnt--) {
122 		src = vc->vc_font.data + (scr_readw(s++)&
123 					  charmask)*cellsize;
124 
125 		if (attr) {
126 			update_attr(buf, src, attr, vc);
127 			src = buf;
128 		}
129 
130 		fb_pad_unaligned_buffer(dst, d_pitch, src, idx,
131 					image->height, shift_high,
132 					shift_low, mod);
133 		shift_low += mod;
134 		dst += (shift_low >= 8) ? s_pitch : s_pitch - 1;
135 		shift_low &= 7;
136 		shift_high = 8 - shift_low;
137 	}
138 
139 	info->fbops->fb_imageblit(info, image);
140 
141 }
142 
bit_putcs(struct vc_data * vc,struct fb_info * info,const unsigned short * s,int count,int yy,int xx,int fg,int bg)143 static void bit_putcs(struct vc_data *vc, struct fb_info *info,
144 		      const unsigned short *s, int count, int yy, int xx,
145 		      int fg, int bg)
146 {
147 	struct fb_image image;
148 	u32 width = DIV_ROUND_UP(vc->vc_font.width, 8);
149 	u32 cellsize = width * vc->vc_font.height;
150 	u32 maxcnt = info->pixmap.size/cellsize;
151 	u32 scan_align = info->pixmap.scan_align - 1;
152 	u32 buf_align = info->pixmap.buf_align - 1;
153 	u32 mod = vc->vc_font.width % 8, cnt, pitch, size;
154 	u32 attribute = get_attribute(info, scr_readw(s));
155 	u8 *dst, *buf = NULL;
156 
157 	image.fg_color = fg;
158 	image.bg_color = bg;
159 	image.dx = xx * vc->vc_font.width;
160 	image.dy = yy * vc->vc_font.height;
161 	image.height = vc->vc_font.height;
162 	image.depth = 1;
163 
164 	if (attribute) {
165 		buf = kmalloc(cellsize, GFP_ATOMIC);
166 		if (!buf)
167 			return;
168 	}
169 
170 	while (count) {
171 		if (count > maxcnt)
172 			cnt = maxcnt;
173 		else
174 			cnt = count;
175 
176 		image.width = vc->vc_font.width * cnt;
177 		pitch = DIV_ROUND_UP(image.width, 8) + scan_align;
178 		pitch &= ~scan_align;
179 		size = pitch * image.height + buf_align;
180 		size &= ~buf_align;
181 		dst = fb_get_buffer_offset(info, &info->pixmap, size);
182 		image.data = dst;
183 
184 		if (!mod)
185 			bit_putcs_aligned(vc, info, s, attribute, cnt, pitch,
186 					  width, cellsize, &image, buf, dst);
187 		else
188 			bit_putcs_unaligned(vc, info, s, attribute, cnt,
189 					    pitch, width, cellsize, &image,
190 					    buf, dst);
191 
192 		image.dx += cnt * vc->vc_font.width;
193 		count -= cnt;
194 		s += cnt;
195 	}
196 
197 	/* buf is always NULL except when in monochrome mode, so in this case
198 	   it's a gain to check buf against NULL even though kfree() handles
199 	   NULL pointers just fine */
200 	if (unlikely(buf))
201 		kfree(buf);
202 
203 }
204 
bit_clear_margins(struct vc_data * vc,struct fb_info * info,int color,int bottom_only)205 static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
206 			      int color, int bottom_only)
207 {
208 	unsigned int cw = vc->vc_font.width;
209 	unsigned int ch = vc->vc_font.height;
210 	unsigned int rw = info->var.xres - (vc->vc_cols*cw);
211 	unsigned int bh = info->var.yres - (vc->vc_rows*ch);
212 	unsigned int rs = info->var.xres - rw;
213 	unsigned int bs = info->var.yres - bh;
214 	struct fb_fillrect region;
215 
216 	region.color = color;
217 	region.rop = ROP_COPY;
218 
219 	if ((int) rw > 0 && !bottom_only) {
220 		region.dx = info->var.xoffset + rs;
221 		region.dy = 0;
222 		region.width = rw;
223 		region.height = info->var.yres_virtual;
224 		info->fbops->fb_fillrect(info, &region);
225 	}
226 
227 	if ((int) bh > 0) {
228 		region.dx = info->var.xoffset;
229 		region.dy = info->var.yoffset + bs;
230 		region.width = rs;
231 		region.height = bh;
232 		info->fbops->fb_fillrect(info, &region);
233 	}
234 }
235 
bit_cursor(struct vc_data * vc,struct fb_info * info,int mode,int fg,int bg)236 static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,
237 		       int fg, int bg)
238 {
239 	struct fb_cursor cursor;
240 	struct fbcon_ops *ops = info->fbcon_par;
241 	unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
242 	int w = DIV_ROUND_UP(vc->vc_font.width, 8), c;
243 	int y = real_y(ops->p, vc->state.y);
244 	int attribute, use_sw = vc->vc_cursor_type & CUR_SW;
245 	int err = 1;
246 	char *src;
247 
248 	cursor.set = 0;
249 
250 	if (!vc->vc_font.data)
251 		return;
252 
253  	c = scr_readw((u16 *) vc->vc_pos);
254 	attribute = get_attribute(info, c);
255 	src = vc->vc_font.data + ((c & charmask) * (w * vc->vc_font.height));
256 
257 	if (ops->cursor_state.image.data != src ||
258 	    ops->cursor_reset) {
259 	    ops->cursor_state.image.data = src;
260 	    cursor.set |= FB_CUR_SETIMAGE;
261 	}
262 
263 	if (attribute) {
264 		u8 *dst;
265 
266 		dst = kmalloc_array(w, vc->vc_font.height, GFP_ATOMIC);
267 		if (!dst)
268 			return;
269 		kfree(ops->cursor_data);
270 		ops->cursor_data = dst;
271 		update_attr(dst, src, attribute, vc);
272 		src = dst;
273 	}
274 
275 	if (ops->cursor_state.image.fg_color != fg ||
276 	    ops->cursor_state.image.bg_color != bg ||
277 	    ops->cursor_reset) {
278 		ops->cursor_state.image.fg_color = fg;
279 		ops->cursor_state.image.bg_color = bg;
280 		cursor.set |= FB_CUR_SETCMAP;
281 	}
282 
283 	if ((ops->cursor_state.image.dx != (vc->vc_font.width * vc->state.x)) ||
284 	    (ops->cursor_state.image.dy != (vc->vc_font.height * y)) ||
285 	    ops->cursor_reset) {
286 		ops->cursor_state.image.dx = vc->vc_font.width * vc->state.x;
287 		ops->cursor_state.image.dy = vc->vc_font.height * y;
288 		cursor.set |= FB_CUR_SETPOS;
289 	}
290 
291 	if (ops->cursor_state.image.height != vc->vc_font.height ||
292 	    ops->cursor_state.image.width != vc->vc_font.width ||
293 	    ops->cursor_reset) {
294 		ops->cursor_state.image.height = vc->vc_font.height;
295 		ops->cursor_state.image.width = vc->vc_font.width;
296 		cursor.set |= FB_CUR_SETSIZE;
297 	}
298 
299 	if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
300 	    ops->cursor_reset) {
301 		ops->cursor_state.hot.x = cursor.hot.y = 0;
302 		cursor.set |= FB_CUR_SETHOT;
303 	}
304 
305 	if (cursor.set & FB_CUR_SETSIZE ||
306 	    vc->vc_cursor_type != ops->p->cursor_shape ||
307 	    ops->cursor_state.mask == NULL ||
308 	    ops->cursor_reset) {
309 		char *mask = kmalloc_array(w, vc->vc_font.height, GFP_ATOMIC);
310 		int cur_height, size, i = 0;
311 		u8 msk = 0xff;
312 
313 		if (!mask)
314 			return;
315 
316 		kfree(ops->cursor_state.mask);
317 		ops->cursor_state.mask = mask;
318 
319 		ops->p->cursor_shape = vc->vc_cursor_type;
320 		cursor.set |= FB_CUR_SETSHAPE;
321 
322 		switch (CUR_SIZE(ops->p->cursor_shape)) {
323 		case CUR_NONE:
324 			cur_height = 0;
325 			break;
326 		case CUR_UNDERLINE:
327 			cur_height = (vc->vc_font.height < 10) ? 1 : 2;
328 			break;
329 		case CUR_LOWER_THIRD:
330 			cur_height = vc->vc_font.height/3;
331 			break;
332 		case CUR_LOWER_HALF:
333 			cur_height = vc->vc_font.height >> 1;
334 			break;
335 		case CUR_TWO_THIRDS:
336 			cur_height = (vc->vc_font.height << 1)/3;
337 			break;
338 		case CUR_BLOCK:
339 		default:
340 			cur_height = vc->vc_font.height;
341 			break;
342 		}
343 		size = (vc->vc_font.height - cur_height) * w;
344 		while (size--)
345 			mask[i++] = ~msk;
346 		size = cur_height * w;
347 		while (size--)
348 			mask[i++] = msk;
349 	}
350 
351 	switch (mode) {
352 	case CM_ERASE:
353 		ops->cursor_state.enable = 0;
354 		break;
355 	case CM_DRAW:
356 	case CM_MOVE:
357 	default:
358 		ops->cursor_state.enable = (use_sw) ? 0 : 1;
359 		break;
360 	}
361 
362 	cursor.image.data = src;
363 	cursor.image.fg_color = ops->cursor_state.image.fg_color;
364 	cursor.image.bg_color = ops->cursor_state.image.bg_color;
365 	cursor.image.dx = ops->cursor_state.image.dx;
366 	cursor.image.dy = ops->cursor_state.image.dy;
367 	cursor.image.height = ops->cursor_state.image.height;
368 	cursor.image.width = ops->cursor_state.image.width;
369 	cursor.hot.x = ops->cursor_state.hot.x;
370 	cursor.hot.y = ops->cursor_state.hot.y;
371 	cursor.mask = ops->cursor_state.mask;
372 	cursor.enable = ops->cursor_state.enable;
373 	cursor.image.depth = 1;
374 	cursor.rop = ROP_XOR;
375 
376 	if (info->fbops->fb_cursor)
377 		err = info->fbops->fb_cursor(info, &cursor);
378 
379 	if (err)
380 		soft_cursor(info, &cursor);
381 
382 	ops->cursor_reset = 0;
383 }
384 
bit_update_start(struct fb_info * info)385 static int bit_update_start(struct fb_info *info)
386 {
387 	struct fbcon_ops *ops = info->fbcon_par;
388 	int err;
389 
390 	err = fb_pan_display(info, &ops->var);
391 	ops->var.xoffset = info->var.xoffset;
392 	ops->var.yoffset = info->var.yoffset;
393 	ops->var.vmode = info->var.vmode;
394 	return err;
395 }
396 
fbcon_set_bitops(struct fbcon_ops * ops)397 void fbcon_set_bitops(struct fbcon_ops *ops)
398 {
399 	ops->bmove = bit_bmove;
400 	ops->clear = bit_clear;
401 	ops->putcs = bit_putcs;
402 	ops->clear_margins = bit_clear_margins;
403 	ops->cursor = bit_cursor;
404 	ops->update_start = bit_update_start;
405 	ops->rotate_font = NULL;
406 
407 	if (ops->rotate)
408 		fbcon_set_rotate(ops);
409 }
410