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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic BitBLT function for frame buffer with packed pixels of any depth.
3 *
4 * Copyright (C) June 1999 James Simmons
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
8 * more details.
9 *
10 * NOTES:
11 *
12 * This function copys a image from system memory to video memory. The
13 * image can be a bitmap where each 0 represents the background color and
14 * each 1 represents the foreground color. Great for font handling. It can
15 * also be a color image. This is determined by image_depth. The color image
16 * must be laid out exactly in the same format as the framebuffer. Yes I know
17 * their are cards with hardware that coverts images of various depths to the
18 * framebuffer depth. But not every card has this. All images must be rounded
19 * up to the nearest byte. For example a bitmap 12 bits wide must be two
20 * bytes width.
21 *
22 * Tony:
23 * Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API. This speeds
24 * up the code significantly.
25 *
26 * Code for depths not multiples of BITS_PER_LONG is still kludgy, which is
27 * still processed a bit at a time.
28 *
29 * Also need to add code to deal with cards endians that are different than
30 * the native cpu endians. I also need to deal with MSB position in the word.
31 */
32#include <linux/config.h>
33#include <linux/module.h>
34#include <linux/string.h>
35#include <linux/fb.h>
36#include <asm/types.h>
37
38#define DEBUG
39
40#ifdef DEBUG
41#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__FUNCTION__,## args)
42#else
43#define DPRINTK(fmt, args...)
44#endif
45
46static u32 cfb_tab8[] = {
47#if defined(__BIG_ENDIAN)
48 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
49 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
50 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
51 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
52#elif defined(__LITTLE_ENDIAN)
53 0x00000000,0xff000000,0x00ff0000,0xffff0000,
54 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
55 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
56 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
57#else
58#error FIXME: No endianness??
59#endif
60};
61
62static u32 cfb_tab16[] = {
63#if defined(__BIG_ENDIAN)
64 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
65#elif defined(__LITTLE_ENDIAN)
66 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
67#else
68#error FIXME: No endianness??
69#endif
70};
71
72static u32 cfb_tab32[] = {
73 0x00000000, 0xffffffff
74};
75
76#define FB_WRITEL fb_writel
77#define FB_READL fb_readl
78
79#if defined (__BIG_ENDIAN)
80#define LEFT_POS(bpp) (32 - bpp)
81#define SHIFT_HIGH(val, bits) ((val) >> (bits))
82#define SHIFT_LOW(val, bits) ((val) << (bits))
83#else
84#define LEFT_POS(bpp) (0)
85#define SHIFT_HIGH(val, bits) ((val) << (bits))
86#define SHIFT_LOW(val, bits) ((val) >> (bits))
87#endif
88
89static inline void color_imageblit(const struct fb_image *image,
90 struct fb_info *p, u8 __iomem *dst1,
91 u32 start_index,
92 u32 pitch_index)
93{
94 /* Draw the penguin */
95 u32 __iomem *dst, *dst2;
96 u32 color = 0, val, shift;
97 int i, n, bpp = p->var.bits_per_pixel;
98 u32 null_bits = 32 - bpp;
99 u32 *palette = (u32 *) p->pseudo_palette;
100 const u8 *src = image->data;
101
102 dst2 = (u32 __iomem *) dst1;
103 for (i = image->height; i--; ) {
104 n = image->width;
105 dst = (u32 __iomem *) dst1;
106 shift = 0;
107 val = 0;
108
109 if (start_index) {
110 u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
111 val = FB_READL(dst) & start_mask;
112 shift = start_index;
113 }
114 while (n--) {
115 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
116 p->fix.visual == FB_VISUAL_DIRECTCOLOR )
117 color = palette[*src];
118 else
119 color = *src;
120 color <<= LEFT_POS(bpp);
121 val |= SHIFT_HIGH(color, shift);
122 if (shift >= null_bits) {
123 FB_WRITEL(val, dst++);
124
125 val = (shift == null_bits) ? 0 :
126 SHIFT_LOW(color, 32 - shift);
127 }
128 shift += bpp;
129 shift &= (32 - 1);
130 src++;
131 }
132 if (shift) {
133 u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
134
135 FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
136 }
137 dst1 += p->fix.line_length;
138 if (pitch_index) {
139 dst2 += p->fix.line_length;
140 dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
141
142 start_index += pitch_index;
143 start_index &= 32 - 1;
144 }
145 }
146}
147
148static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
149 u8 __iomem *dst1, u32 fgcolor,
150 u32 bgcolor,
151 u32 start_index,
152 u32 pitch_index)
153{
154 u32 shift, color = 0, bpp = p->var.bits_per_pixel;
155 u32 __iomem *dst, *dst2;
156 u32 val, pitch = p->fix.line_length;
157 u32 null_bits = 32 - bpp;
158 u32 spitch = (image->width+7)/8;
159 const u8 *src = image->data, *s;
160 u32 i, j, l;
161
162 dst2 = (u32 __iomem *) dst1;
163
164 for (i = image->height; i--; ) {
165 shift = val = 0;
166 l = 8;
167 j = image->width;
168 dst = (u32 __iomem *) dst1;
169 s = src;
170
171 /* write leading bits */
172 if (start_index) {
173 u32 start_mask = ~(SHIFT_HIGH(~(u32)0, start_index));
174 val = FB_READL(dst) & start_mask;
175 shift = start_index;
176 }
177
178 while (j--) {
179 l--;
180 color = (*s & (1 << l)) ? fgcolor : bgcolor;
181 color <<= LEFT_POS(bpp);
182 val |= SHIFT_HIGH(color, shift);
183
184 /* Did the bitshift spill bits to the next long? */
185 if (shift >= null_bits) {
186 FB_WRITEL(val, dst++);
187 val = (shift == null_bits) ? 0 :
188 SHIFT_LOW(color,32 - shift);
189 }
190 shift += bpp;
191 shift &= (32 - 1);
192 if (!l) { l = 8; s++; };
193 }
194
195 /* write trailing bits */
196 if (shift) {
197 u32 end_mask = SHIFT_HIGH(~(u32)0, shift);
198
199 FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
200 }
201
202 dst1 += pitch;
203 src += spitch;
204 if (pitch_index) {
205 dst2 += pitch;
206 dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
207 start_index += pitch_index;
208 start_index &= 32 - 1;
209 }
210
211 }
212}
213
214/*
215 * fast_imageblit - optimized monochrome color expansion
216 *
217 * Only if: bits_per_pixel == 8, 16, or 32
218 * image->width is divisible by pixel/dword (ppw);
219 * fix->line_legth is divisible by 4;
220 * beginning and end of a scanline is dword aligned
221 */
222static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
223 u8 __iomem *dst1, u32 fgcolor,
224 u32 bgcolor)
225{
226 u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
227 u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
228 u32 bit_mask, end_mask, eorx, shift;
229 const char *s = image->data, *src;
230 u32 __iomem *dst;
231 u32 *tab = NULL;
232 int i, j, k;
233
234 switch (bpp) {
235 case 8:
236 tab = cfb_tab8;
237 break;
238 case 16:
239 tab = cfb_tab16;
240 break;
241 case 32:
242 tab = cfb_tab32;
243 break;
244 }
245
246 for (i = ppw-1; i--; ) {
247 fgx <<= bpp;
248 bgx <<= bpp;
249 fgx |= fgcolor;
250 bgx |= bgcolor;
251 }
252
253 bit_mask = (1 << ppw) - 1;
254 eorx = fgx ^ bgx;
255 k = image->width/ppw;
256
257 for (i = image->height; i--; ) {
258 dst = (u32 __iomem *) dst1, shift = 8; src = s;
259
260 for (j = k; j--; ) {
261 shift -= ppw;
262 end_mask = tab[(*src >> shift) & bit_mask];
263 FB_WRITEL((end_mask & eorx)^bgx, dst++);
264 if (!shift) { shift = 8; src++; }
265 }
266 dst1 += p->fix.line_length;
267 s += spitch;
268 }
269}
270
271void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
272{
273 u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
274 u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
275 u32 width = image->width, height = image->height;
276 u32 dx = image->dx, dy = image->dy;
277 int x2, y2, vxres, vyres;
278 u8 __iomem *dst1;
279
280 if (p->state != FBINFO_STATE_RUNNING)
281 return;
282
283 vxres = p->var.xres_virtual;
284 vyres = p->var.yres_virtual;
285 /*
286 * We could use hardware clipping but on many cards you get around
287 * hardware clipping by writing to framebuffer directly like we are
288 * doing here.
289 */
290 if (image->dx > vxres || image->dy > vyres)
291 return;
292
293 x2 = image->dx + image->width;
294 y2 = image->dy + image->height;
295 dx = image->dx > 0 ? image->dx : 0;
296 dy = image->dy > 0 ? image->dy : 0;
297 x2 = x2 < vxres ? x2 : vxres;
298 y2 = y2 < vyres ? y2 : vyres;
299 width = x2 - dx;
300 height = y2 - dy;
301
302 bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
303 start_index = bitstart & (32 - 1);
304 pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
305
306 bitstart /= 8;
307 bitstart &= ~(bpl - 1);
308 dst1 = p->screen_base + bitstart;
309
310 if (p->fbops->fb_sync)
311 p->fbops->fb_sync(p);
312
313 if (image->depth == 1) {
314 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
315 p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
316 fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
317 bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
318 } else {
319 fgcolor = image->fg_color;
320 bgcolor = image->bg_color;
321 }
322
323 if (32 % bpp == 0 && !start_index && !pitch_index &&
324 ((width & (32/bpp-1)) == 0) &&
325 bpp >= 8 && bpp <= 32)
326 fast_imageblit(image, p, dst1, fgcolor, bgcolor);
327 else
328 slow_imageblit(image, p, dst1, fgcolor, bgcolor,
329 start_index, pitch_index);
330 } else
331 color_imageblit(image, p, dst1, start_index, pitch_index);
332}
333
334EXPORT_SYMBOL(cfb_imageblit);
335
336MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
337MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
338MODULE_LICENSE("GPL");
339