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,__func__,## args)
22#else
23#define DPRINTK(fmt, args...)
24#endif
25
26static const u32 cfb_tab8_be[] = {
27 0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
28 0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
29 0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
30 0xffff0000,0xffff00ff,0xffffff00,0xffffffff
31};
32
33static const u32 cfb_tab8_le[] = {
34 0x00000000,0xff000000,0x00ff0000,0xffff0000,
35 0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
36 0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
37 0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
38};
39
40static const u32 cfb_tab16_be[] = {
41 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
42};
43
44static const u32 cfb_tab16_le[] = {
45 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
46};
47
48static const u32 cfb_tab32[] = {
49 0x00000000, 0xffffffff
50};
51
52static void color_imageblit(const struct fb_image *image, struct fb_info *p,
53 void *dst1, u32 start_index, u32 pitch_index)
54{
55 /* Draw the penguin */
56 u32 *dst, *dst2;
57 u32 color = 0, val, shift;
58 int i, n, bpp = p->var.bits_per_pixel;
59 u32 null_bits = 32 - bpp;
60 u32 *palette = (u32 *) p->pseudo_palette;
61 const u8 *src = image->data;
62
63 dst2 = dst1;
64 for (i = image->height; i--; ) {
65 n = image->width;
66 dst = dst1;
67 shift = 0;
68 val = 0;
69
70 if (start_index) {
71 u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
72 start_index));
73 val = *dst & start_mask;
74 shift = start_index;
75 }
76 while (n--) {
77 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
78 p->fix.visual == FB_VISUAL_DIRECTCOLOR )
79 color = palette[*src];
80 else
81 color = *src;
82 color <<= FB_LEFT_POS(p, bpp);
83 val |= FB_SHIFT_HIGH(p, color, shift);
84 if (shift >= null_bits) {
85 *dst++ = val;
86
87 val = (shift == null_bits) ? 0 :
88 FB_SHIFT_LOW(p, color, 32 - shift);
89 }
90 shift += bpp;
91 shift &= (32 - 1);
92 src++;
93 }
94 if (shift) {
95 u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
96
97 *dst &= end_mask;
98 *dst |= val;
99 }
100 dst1 += p->fix.line_length;
101 if (pitch_index) {
102 dst2 += p->fix.line_length;
103 dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
104
105 start_index += pitch_index;
106 start_index &= 32 - 1;
107 }
108 }
109}
110
111static void slow_imageblit(const struct fb_image *image, struct fb_info *p,
112 void *dst1, u32 fgcolor, u32 bgcolor,
113 u32 start_index, u32 pitch_index)
114{
115 u32 shift, color = 0, bpp = p->var.bits_per_pixel;
116 u32 *dst, *dst2;
117 u32 val, pitch = p->fix.line_length;
118 u32 null_bits = 32 - bpp;
119 u32 spitch = (image->width+7)/8;
120 const u8 *src = image->data, *s;
121 u32 i, j, l;
122
123 dst2 = dst1;
124 fgcolor <<= FB_LEFT_POS(p, bpp);
125 bgcolor <<= FB_LEFT_POS(p, bpp);
126
127 for (i = image->height; i--; ) {
128 shift = val = 0;
129 l = 8;
130 j = image->width;
131 dst = dst1;
132 s = src;
133
134 /* write leading bits */
135 if (start_index) {
136 u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
137 start_index));
138 val = *dst & start_mask;
139 shift = start_index;
140 }
141
142 while (j--) {
143 l--;
144 color = (*s & (1 << l)) ? fgcolor : bgcolor;
145 val |= FB_SHIFT_HIGH(p, color, shift);
146
147 /* Did the bitshift spill bits to the next long? */
148 if (shift >= null_bits) {
149 *dst++ = val;
150 val = (shift == null_bits) ? 0 :
151 FB_SHIFT_LOW(p, color, 32 - shift);
152 }
153 shift += bpp;
154 shift &= (32 - 1);
155 if (!l) { l = 8; s++; }
156 }
157
158 /* write trailing bits */
159 if (shift) {
160 u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
161
162 *dst &= end_mask;
163 *dst |= val;
164 }
165
166 dst1 += pitch;
167 src += spitch;
168 if (pitch_index) {
169 dst2 += pitch;
170 dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
171 start_index += pitch_index;
172 start_index &= 32 - 1;
173 }
174
175 }
176}
177
178/*
179 * fast_imageblit - optimized monochrome color expansion
180 *
181 * Only if: bits_per_pixel == 8, 16, or 32
182 * image->width is divisible by pixel/dword (ppw);
183 * fix->line_legth is divisible by 4;
184 * beginning and end of a scanline is dword aligned
185 */
186static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
187 void *dst1, u32 fgcolor, u32 bgcolor)
188{
189 u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
190 u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
191 u32 bit_mask, eorx, shift;
192 const u8 *s = image->data, *src;
193 u32 *dst;
194 const u32 *tab;
195 size_t tablen;
196 u32 colortab[16];
197 int i, j, k;
198
199 switch (bpp) {
200 case 8:
201 tab = fb_be_math(info: p) ? cfb_tab8_be : cfb_tab8_le;
202 tablen = 16;
203 break;
204 case 16:
205 tab = fb_be_math(info: p) ? cfb_tab16_be : cfb_tab16_le;
206 tablen = 4;
207 break;
208 case 32:
209 tab = cfb_tab32;
210 tablen = 2;
211 break;
212 default:
213 return;
214 }
215
216 for (i = ppw-1; i--; ) {
217 fgx <<= bpp;
218 bgx <<= bpp;
219 fgx |= fgcolor;
220 bgx |= bgcolor;
221 }
222
223 bit_mask = (1 << ppw) - 1;
224 eorx = fgx ^ bgx;
225 k = image->width/ppw;
226
227 for (i = 0; i < tablen; ++i)
228 colortab[i] = (tab[i] & eorx) ^ bgx;
229
230 for (i = image->height; i--; ) {
231 dst = dst1;
232 shift = 8;
233 src = s;
234
235 /*
236 * Manually unroll the per-line copying loop for better
237 * performance. This works until we processed the last
238 * completely filled source byte (inclusive).
239 */
240 switch (ppw) {
241 case 4: /* 8 bpp */
242 for (j = k; j >= 2; j -= 2, ++src) {
243 *dst++ = colortab[(*src >> 4) & bit_mask];
244 *dst++ = colortab[(*src >> 0) & bit_mask];
245 }
246 break;
247 case 2: /* 16 bpp */
248 for (j = k; j >= 4; j -= 4, ++src) {
249 *dst++ = colortab[(*src >> 6) & bit_mask];
250 *dst++ = colortab[(*src >> 4) & bit_mask];
251 *dst++ = colortab[(*src >> 2) & bit_mask];
252 *dst++ = colortab[(*src >> 0) & bit_mask];
253 }
254 break;
255 case 1: /* 32 bpp */
256 for (j = k; j >= 8; j -= 8, ++src) {
257 *dst++ = colortab[(*src >> 7) & bit_mask];
258 *dst++ = colortab[(*src >> 6) & bit_mask];
259 *dst++ = colortab[(*src >> 5) & bit_mask];
260 *dst++ = colortab[(*src >> 4) & bit_mask];
261 *dst++ = colortab[(*src >> 3) & bit_mask];
262 *dst++ = colortab[(*src >> 2) & bit_mask];
263 *dst++ = colortab[(*src >> 1) & bit_mask];
264 *dst++ = colortab[(*src >> 0) & bit_mask];
265 }
266 break;
267 }
268
269 /*
270 * For image widths that are not a multiple of 8, there
271 * are trailing pixels left on the current line. Print
272 * them as well.
273 */
274 for (; j--; ) {
275 shift -= ppw;
276 *dst++ = colortab[(*src >> shift) & bit_mask];
277 if (!shift) {
278 shift = 8;
279 ++src;
280 }
281 }
282
283 dst1 += p->fix.line_length;
284 s += spitch;
285 }
286}
287
288void sys_imageblit(struct fb_info *p, const struct fb_image *image)
289{
290 u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
291 u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
292 u32 width = image->width;
293 u32 dx = image->dx, dy = image->dy;
294 void *dst1;
295
296 if (p->state != FBINFO_STATE_RUNNING)
297 return;
298
299 if (!(p->flags & FBINFO_VIRTFB))
300 fb_warn_once(p, "Framebuffer is not in virtual address space.");
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 = (void __force *)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(sys_imageblit);
335
336MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
337MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
338MODULE_LICENSE("GPL");
339
340

source code of linux/drivers/video/fbdev/core/sysimgblt.c