nvidiafb: adjust flags to take advantage of new scroll method
[linux-2.6] / drivers / video / sysimgblt.c
1 /*
2  *  Generic 1-bit or 8-bit source to 1-32 bit destination expansion
3  *  for frame buffer located in system RAM with packed pixels of any depth.
4  *
5  *  Based almost entirely on cfbimgblt.c
6  *
7  *      Copyright (C)  April 2007 Antonino Daplas <adaplas@pol.net>
8  *
9  *  This file is subject to the terms and conditions of the GNU General Public
10  *  License.  See the file COPYING in the main directory of this archive for
11  *  more details.
12  */
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/fb.h>
16 #include <asm/types.h>
17
18 #define DEBUG
19
20 #ifdef DEBUG
21 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__FUNCTION__,## args)
22 #else
23 #define DPRINTK(fmt, args...)
24 #endif
25
26 static const u32 cfb_tab8[] = {
27 #if defined(__BIG_ENDIAN)
28     0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
29     0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
30     0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
31     0xffff0000,0xffff00ff,0xffffff00,0xffffffff
32 #elif defined(__LITTLE_ENDIAN)
33     0x00000000,0xff000000,0x00ff0000,0xffff0000,
34     0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
35     0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
36     0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
37 #else
38 #error FIXME: No endianness??
39 #endif
40 };
41
42 static const u32 cfb_tab16[] = {
43 #if defined(__BIG_ENDIAN)
44     0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
45 #elif defined(__LITTLE_ENDIAN)
46     0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
47 #else
48 #error FIXME: No endianness??
49 #endif
50 };
51
52 static const u32 cfb_tab32[] = {
53         0x00000000, 0xffffffff
54 };
55
56 static void color_imageblit(const struct fb_image *image, struct fb_info *p,
57                             void *dst1, u32 start_index, u32 pitch_index)
58 {
59         /* Draw the penguin */
60         u32 *dst, *dst2;
61         u32 color = 0, val, shift;
62         int i, n, bpp = p->var.bits_per_pixel;
63         u32 null_bits = 32 - bpp;
64         u32 *palette = (u32 *) p->pseudo_palette;
65         const u8 *src = image->data;
66
67         dst2 = dst1;
68         for (i = image->height; i--; ) {
69                 n = image->width;
70                 dst = dst1;
71                 shift = 0;
72                 val = 0;
73
74                 if (start_index) {
75                         u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0,
76                                                          start_index));
77                         val = *dst & start_mask;
78                         shift = start_index;
79                 }
80                 while (n--) {
81                         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
82                             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
83                                 color = palette[*src];
84                         else
85                                 color = *src;
86                         color <<= FB_LEFT_POS(bpp);
87                         val |= FB_SHIFT_HIGH(color, shift);
88                         if (shift >= null_bits) {
89                                 *dst++ = val;
90
91                                 val = (shift == null_bits) ? 0 :
92                                         FB_SHIFT_LOW(color, 32 - shift);
93                         }
94                         shift += bpp;
95                         shift &= (32 - 1);
96                         src++;
97                 }
98                 if (shift) {
99                         u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
100
101                         *dst &= end_mask;
102                         *dst |= val;
103                 }
104                 dst1 += p->fix.line_length;
105                 if (pitch_index) {
106                         dst2 += p->fix.line_length;
107                         dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
108
109                         start_index += pitch_index;
110                         start_index &= 32 - 1;
111                 }
112         }
113 }
114
115 static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
116                                   void *dst1, u32 fgcolor, u32 bgcolor,
117                                   u32 start_index, u32 pitch_index)
118 {
119         u32 shift, color = 0, bpp = p->var.bits_per_pixel;
120         u32 *dst, *dst2;
121         u32 val, pitch = p->fix.line_length;
122         u32 null_bits = 32 - bpp;
123         u32 spitch = (image->width+7)/8;
124         const u8 *src = image->data, *s;
125         u32 i, j, l;
126
127         dst2 = dst1;
128         fgcolor <<= FB_LEFT_POS(bpp);
129         bgcolor <<= FB_LEFT_POS(bpp);
130
131         for (i = image->height; i--; ) {
132                 shift = val = 0;
133                 l = 8;
134                 j = image->width;
135                 dst = dst1;
136                 s = src;
137
138                 /* write leading bits */
139                 if (start_index) {
140                         u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0,start_index));
141                         val = *dst & start_mask;
142                         shift = start_index;
143                 }
144
145                 while (j--) {
146                         l--;
147                         color = (*s & (1 << l)) ? fgcolor : bgcolor;
148                         val |= FB_SHIFT_HIGH(color, shift);
149
150                         /* Did the bitshift spill bits to the next long? */
151                         if (shift >= null_bits) {
152                                 *dst++ = val;
153                                 val = (shift == null_bits) ? 0 :
154                                         FB_SHIFT_LOW(color,32 - shift);
155                         }
156                         shift += bpp;
157                         shift &= (32 - 1);
158                         if (!l) { l = 8; s++; };
159                 }
160
161                 /* write trailing bits */
162                 if (shift) {
163                         u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
164
165                         *dst &= end_mask;
166                         *dst |= val;
167                 }
168
169                 dst1 += pitch;
170                 src += spitch;
171                 if (pitch_index) {
172                         dst2 += pitch;
173                         dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
174                         start_index += pitch_index;
175                         start_index &= 32 - 1;
176                 }
177
178         }
179 }
180
181 /*
182  * fast_imageblit - optimized monochrome color expansion
183  *
184  * Only if:  bits_per_pixel == 8, 16, or 32
185  *           image->width is divisible by pixel/dword (ppw);
186  *           fix->line_legth is divisible by 4;
187  *           beginning and end of a scanline is dword aligned
188  */
189 static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
190                                   void *dst1, u32 fgcolor, u32 bgcolor)
191 {
192         u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
193         u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
194         u32 bit_mask, end_mask, eorx, shift;
195         const char *s = image->data, *src;
196         u32 *dst;
197         const u32 *tab = NULL;
198         int i, j, k;
199
200         switch (bpp) {
201         case 8:
202                 tab = cfb_tab8;
203                 break;
204         case 16:
205                 tab = cfb_tab16;
206                 break;
207         case 32:
208         default:
209                 tab = cfb_tab32;
210                 break;
211         }
212
213         for (i = ppw-1; i--; ) {
214                 fgx <<= bpp;
215                 bgx <<= bpp;
216                 fgx |= fgcolor;
217                 bgx |= bgcolor;
218         }
219
220         bit_mask = (1 << ppw) - 1;
221         eorx = fgx ^ bgx;
222         k = image->width/ppw;
223
224         for (i = image->height; i--; ) {
225                 dst = dst1;
226                 shift = 8;
227                 src = s;
228
229                 for (j = k; j--; ) {
230                         shift -= ppw;
231                         end_mask = tab[(*src >> shift) & bit_mask];
232                         *dst++ = (end_mask & eorx) ^ bgx;
233                         if (!shift) {
234                                 shift = 8;
235                                 src++;
236                         }
237                 }
238                 dst1 += p->fix.line_length;
239                 s += spitch;
240         }
241 }
242
243 void sys_imageblit(struct fb_info *p, const struct fb_image *image)
244 {
245         u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
246         u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
247         u32 width = image->width;
248         u32 dx = image->dx, dy = image->dy;
249         void *dst1;
250
251         if (p->state != FBINFO_STATE_RUNNING)
252                 return;
253
254         bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
255         start_index = bitstart & (32 - 1);
256         pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
257
258         bitstart /= 8;
259         bitstart &= ~(bpl - 1);
260         dst1 = (void __force *)p->screen_base + bitstart;
261
262         if (p->fbops->fb_sync)
263                 p->fbops->fb_sync(p);
264
265         if (image->depth == 1) {
266                 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
267                     p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
268                         fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
269                         bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
270                 } else {
271                         fgcolor = image->fg_color;
272                         bgcolor = image->bg_color;
273                 }
274
275                 if (32 % bpp == 0 && !start_index && !pitch_index &&
276                     ((width & (32/bpp-1)) == 0) &&
277                     bpp >= 8 && bpp <= 32)
278                         fast_imageblit(image, p, dst1, fgcolor, bgcolor);
279                 else
280                         slow_imageblit(image, p, dst1, fgcolor, bgcolor,
281                                         start_index, pitch_index);
282         } else
283                 color_imageblit(image, p, dst1, start_index, pitch_index);
284 }
285
286 EXPORT_SYMBOL(sys_imageblit);
287
288 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
289 MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
290 MODULE_LICENSE("GPL");
291