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[sfrench/cifs-2.6.git] / drivers / video / fbdev / core / cfbimgblt.c
1 /*
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/module.h>
33 #include <linux/string.h>
34 #include <linux/fb.h>
35 #include <asm/types.h>
36 #include "fb_draw.h"
37
38 #define DEBUG
39
40 #ifdef DEBUG
41 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__func__,## args)
42 #else
43 #define DPRINTK(fmt, args...)
44 #endif
45
46 static const u32 cfb_tab8_be[] = {
47     0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
48     0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
49     0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
50     0xffff0000,0xffff00ff,0xffffff00,0xffffffff
51 };
52
53 static const u32 cfb_tab8_le[] = {
54     0x00000000,0xff000000,0x00ff0000,0xffff0000,
55     0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
56     0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
57     0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
58 };
59
60 static const u32 cfb_tab16_be[] = {
61     0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
62 };
63
64 static const u32 cfb_tab16_le[] = {
65     0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
66 };
67
68 static const u32 cfb_tab32[] = {
69         0x00000000, 0xffffffff
70 };
71
72 #define FB_WRITEL fb_writel
73 #define FB_READL  fb_readl
74
75 static inline void color_imageblit(const struct fb_image *image,
76                                    struct fb_info *p, u8 __iomem *dst1,
77                                    u32 start_index,
78                                    u32 pitch_index)
79 {
80         /* Draw the penguin */
81         u32 __iomem *dst, *dst2;
82         u32 color = 0, val, shift;
83         int i, n, bpp = p->var.bits_per_pixel;
84         u32 null_bits = 32 - bpp;
85         u32 *palette = (u32 *) p->pseudo_palette;
86         const u8 *src = image->data;
87         u32 bswapmask = fb_compute_bswapmask(p);
88
89         dst2 = (u32 __iomem *) dst1;
90         for (i = image->height; i--; ) {
91                 n = image->width;
92                 dst = (u32 __iomem *) dst1;
93                 shift = 0;
94                 val = 0;
95
96                 if (start_index) {
97                         u32 start_mask = ~fb_shifted_pixels_mask_u32(p,
98                                                 start_index, bswapmask);
99                         val = FB_READL(dst) & start_mask;
100                         shift = start_index;
101                 }
102                 while (n--) {
103                         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
104                             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
105                                 color = palette[*src];
106                         else
107                                 color = *src;
108                         color <<= FB_LEFT_POS(p, bpp);
109                         val |= FB_SHIFT_HIGH(p, color, shift ^ bswapmask);
110                         if (shift >= null_bits) {
111                                 FB_WRITEL(val, dst++);
112
113                                 val = (shift == null_bits) ? 0 :
114                                         FB_SHIFT_LOW(p, color, 32 - shift);
115                         }
116                         shift += bpp;
117                         shift &= (32 - 1);
118                         src++;
119                 }
120                 if (shift) {
121                         u32 end_mask = fb_shifted_pixels_mask_u32(p, shift,
122                                                 bswapmask);
123
124                         FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
125                 }
126                 dst1 += p->fix.line_length;
127                 if (pitch_index) {
128                         dst2 += p->fix.line_length;
129                         dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
130
131                         start_index += pitch_index;
132                         start_index &= 32 - 1;
133                 }
134         }
135 }
136
137 static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
138                                   u8 __iomem *dst1, u32 fgcolor,
139                                   u32 bgcolor,
140                                   u32 start_index,
141                                   u32 pitch_index)
142 {
143         u32 shift, color = 0, bpp = p->var.bits_per_pixel;
144         u32 __iomem *dst, *dst2;
145         u32 val, pitch = p->fix.line_length;
146         u32 null_bits = 32 - bpp;
147         u32 spitch = (image->width+7)/8;
148         const u8 *src = image->data, *s;
149         u32 i, j, l;
150         u32 bswapmask = fb_compute_bswapmask(p);
151
152         dst2 = (u32 __iomem *) dst1;
153         fgcolor <<= FB_LEFT_POS(p, bpp);
154         bgcolor <<= FB_LEFT_POS(p, bpp);
155
156         for (i = image->height; i--; ) {
157                 shift = val = 0;
158                 l = 8;
159                 j = image->width;
160                 dst = (u32 __iomem *) dst1;
161                 s = src;
162
163                 /* write leading bits */
164                 if (start_index) {
165                         u32 start_mask = ~fb_shifted_pixels_mask_u32(p,
166                                                 start_index, bswapmask);
167                         val = FB_READL(dst) & start_mask;
168                         shift = start_index;
169                 }
170
171                 while (j--) {
172                         l--;
173                         color = (*s & (1 << l)) ? fgcolor : bgcolor;
174                         val |= FB_SHIFT_HIGH(p, color, shift ^ bswapmask);
175
176                         /* Did the bitshift spill bits to the next long? */
177                         if (shift >= null_bits) {
178                                 FB_WRITEL(val, dst++);
179                                 val = (shift == null_bits) ? 0 :
180                                         FB_SHIFT_LOW(p, color, 32 - shift);
181                         }
182                         shift += bpp;
183                         shift &= (32 - 1);
184                         if (!l) { l = 8; s++; }
185                 }
186
187                 /* write trailing bits */
188                 if (shift) {
189                         u32 end_mask = fb_shifted_pixels_mask_u32(p, shift,
190                                                 bswapmask);
191
192                         FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
193                 }
194
195                 dst1 += pitch;
196                 src += spitch;
197                 if (pitch_index) {
198                         dst2 += pitch;
199                         dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
200                         start_index += pitch_index;
201                         start_index &= 32 - 1;
202                 }
203
204         }
205 }
206
207 /*
208  * fast_imageblit - optimized monochrome color expansion
209  *
210  * Only if:  bits_per_pixel == 8, 16, or 32
211  *           image->width is divisible by pixel/dword (ppw);
212  *           fix->line_legth is divisible by 4;
213  *           beginning and end of a scanline is dword aligned
214  */
215 static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
216                                   u8 __iomem *dst1, u32 fgcolor,
217                                   u32 bgcolor)
218 {
219         u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
220         u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
221         u32 bit_mask, eorx, shift;
222         const char *s = image->data, *src;
223         u32 __iomem *dst;
224         const u32 *tab = NULL;
225         size_t tablen;
226         u32 colortab[16];
227         int i, j, k;
228
229         switch (bpp) {
230         case 8:
231                 tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
232                 tablen = 16;
233                 break;
234         case 16:
235                 tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
236                 tablen = 4;
237                 break;
238         case 32:
239                 tab = cfb_tab32;
240                 tablen = 2;
241                 break;
242         default:
243                 return;
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 = 0; i < tablen; ++i)
258                 colortab[i] = (tab[i] & eorx) ^ bgx;
259
260         for (i = image->height; i--; ) {
261                 dst = (u32 __iomem *)dst1;
262                 shift = 8;
263                 src = s;
264
265                 /*
266                  * Manually unroll the per-line copying loop for better
267                  * performance. This works until we processed the last
268                  * completely filled source byte (inclusive).
269                  */
270                 switch (ppw) {
271                 case 4: /* 8 bpp */
272                         for (j = k; j >= 2; j -= 2, ++src) {
273                                 FB_WRITEL(colortab[(*src >> 4) & bit_mask], dst++);
274                                 FB_WRITEL(colortab[(*src >> 0) & bit_mask], dst++);
275                         }
276                         break;
277                 case 2: /* 16 bpp */
278                         for (j = k; j >= 4; j -= 4, ++src) {
279                                 FB_WRITEL(colortab[(*src >> 6) & bit_mask], dst++);
280                                 FB_WRITEL(colortab[(*src >> 4) & bit_mask], dst++);
281                                 FB_WRITEL(colortab[(*src >> 2) & bit_mask], dst++);
282                                 FB_WRITEL(colortab[(*src >> 0) & bit_mask], dst++);
283                         }
284                         break;
285                 case 1: /* 32 bpp */
286                         for (j = k; j >= 8; j -= 8, ++src) {
287                                 FB_WRITEL(colortab[(*src >> 7) & bit_mask], dst++);
288                                 FB_WRITEL(colortab[(*src >> 6) & bit_mask], dst++);
289                                 FB_WRITEL(colortab[(*src >> 5) & bit_mask], dst++);
290                                 FB_WRITEL(colortab[(*src >> 4) & bit_mask], dst++);
291                                 FB_WRITEL(colortab[(*src >> 3) & bit_mask], dst++);
292                                 FB_WRITEL(colortab[(*src >> 2) & bit_mask], dst++);
293                                 FB_WRITEL(colortab[(*src >> 1) & bit_mask], dst++);
294                                 FB_WRITEL(colortab[(*src >> 0) & bit_mask], dst++);
295                         }
296                         break;
297                 }
298
299                 /*
300                  * For image widths that are not a multiple of 8, there
301                  * are trailing pixels left on the current line. Print
302                  * them as well.
303                  */
304                 for (; j--; ) {
305                         shift -= ppw;
306                         FB_WRITEL(colortab[(*src >> shift) & bit_mask], dst++);
307                         if (!shift) {
308                                 shift = 8;
309                                 ++src;
310                         }
311                 }
312
313                 dst1 += p->fix.line_length;
314                 s += spitch;
315         }
316 }
317
318 void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
319 {
320         u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
321         u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
322         u32 width = image->width;
323         u32 dx = image->dx, dy = image->dy;
324         u8 __iomem *dst1;
325
326         if (p->state != FBINFO_STATE_RUNNING)
327                 return;
328
329         bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
330         start_index = bitstart & (32 - 1);
331         pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
332
333         bitstart /= 8;
334         bitstart &= ~(bpl - 1);
335         dst1 = p->screen_base + bitstart;
336
337         if (p->fbops->fb_sync)
338                 p->fbops->fb_sync(p);
339
340         if (image->depth == 1) {
341                 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
342                     p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
343                         fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
344                         bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
345                 } else {
346                         fgcolor = image->fg_color;
347                         bgcolor = image->bg_color;
348                 }
349
350                 if (32 % bpp == 0 && !start_index && !pitch_index &&
351                     ((width & (32/bpp-1)) == 0) &&
352                     bpp >= 8 && bpp <= 32)
353                         fast_imageblit(image, p, dst1, fgcolor, bgcolor);
354                 else
355                         slow_imageblit(image, p, dst1, fgcolor, bgcolor,
356                                         start_index, pitch_index);
357         } else
358                 color_imageblit(image, p, dst1, start_index, pitch_index);
359 }
360
361 EXPORT_SYMBOL(cfb_imageblit);
362
363 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
364 MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
365 MODULE_LICENSE("GPL");
366