Line data Source code
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 :
26 : static 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 :
33 : static 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 :
40 : static const u32 cfb_tab16_be[] = {
41 : 0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
42 : };
43 :
44 : static const u32 cfb_tab16_le[] = {
45 : 0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
46 : };
47 :
48 : static const u32 cfb_tab32[] = {
49 : 0x00000000, 0xffffffff
50 : };
51 :
52 0 : static 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 0 : u32 color = 0, val, shift;
58 0 : int i, n, bpp = p->var.bits_per_pixel;
59 0 : u32 null_bits = 32 - bpp;
60 0 : u32 *palette = (u32 *) p->pseudo_palette;
61 0 : const u8 *src = image->data;
62 :
63 0 : dst2 = dst1;
64 0 : for (i = image->height; i--; ) {
65 0 : n = image->width;
66 0 : dst = dst1;
67 0 : shift = 0;
68 0 : val = 0;
69 :
70 0 : if (start_index) {
71 0 : u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
72 : start_index));
73 0 : val = *dst & start_mask;
74 0 : shift = start_index;
75 : }
76 0 : while (n--) {
77 0 : if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
78 : p->fix.visual == FB_VISUAL_DIRECTCOLOR )
79 0 : color = palette[*src];
80 : else
81 0 : color = *src;
82 0 : color <<= FB_LEFT_POS(p, bpp);
83 0 : val |= FB_SHIFT_HIGH(p, color, shift);
84 0 : if (shift >= null_bits) {
85 0 : *dst++ = val;
86 :
87 0 : val = (shift == null_bits) ? 0 :
88 0 : FB_SHIFT_LOW(p, color, 32 - shift);
89 : }
90 0 : shift += bpp;
91 0 : shift &= (32 - 1);
92 0 : src++;
93 : }
94 0 : if (shift) {
95 0 : u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
96 :
97 0 : *dst &= end_mask;
98 0 : *dst |= val;
99 : }
100 0 : dst1 += p->fix.line_length;
101 0 : if (pitch_index) {
102 0 : dst2 += p->fix.line_length;
103 0 : dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
104 :
105 0 : start_index += pitch_index;
106 0 : start_index &= 32 - 1;
107 : }
108 : }
109 0 : }
110 :
111 0 : static 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 0 : u32 shift, color = 0, bpp = p->var.bits_per_pixel;
116 : u32 *dst, *dst2;
117 0 : u32 val, pitch = p->fix.line_length;
118 0 : u32 null_bits = 32 - bpp;
119 0 : u32 spitch = (image->width+7)/8;
120 0 : const u8 *src = image->data, *s;
121 : u32 i, j, l;
122 :
123 0 : dst2 = dst1;
124 0 : fgcolor <<= FB_LEFT_POS(p, bpp);
125 0 : bgcolor <<= FB_LEFT_POS(p, bpp);
126 :
127 0 : for (i = image->height; i--; ) {
128 0 : shift = val = 0;
129 0 : l = 8;
130 0 : j = image->width;
131 0 : dst = dst1;
132 0 : s = src;
133 :
134 : /* write leading bits */
135 0 : if (start_index) {
136 0 : u32 start_mask = ~(FB_SHIFT_HIGH(p, ~(u32)0,
137 : start_index));
138 0 : val = *dst & start_mask;
139 0 : shift = start_index;
140 : }
141 :
142 0 : while (j--) {
143 0 : l--;
144 0 : color = (*s & (1 << l)) ? fgcolor : bgcolor;
145 0 : val |= FB_SHIFT_HIGH(p, color, shift);
146 :
147 : /* Did the bitshift spill bits to the next long? */
148 0 : if (shift >= null_bits) {
149 0 : *dst++ = val;
150 0 : val = (shift == null_bits) ? 0 :
151 0 : FB_SHIFT_LOW(p, color, 32 - shift);
152 : }
153 0 : shift += bpp;
154 0 : shift &= (32 - 1);
155 0 : if (!l) { l = 8; s++; }
156 : }
157 :
158 : /* write trailing bits */
159 0 : if (shift) {
160 0 : u32 end_mask = FB_SHIFT_HIGH(p, ~(u32)0, shift);
161 :
162 0 : *dst &= end_mask;
163 0 : *dst |= val;
164 : }
165 :
166 0 : dst1 += pitch;
167 0 : src += spitch;
168 0 : if (pitch_index) {
169 0 : dst2 += pitch;
170 0 : dst1 = (u8 *)((long)dst2 & ~(sizeof(u32) - 1));
171 0 : start_index += pitch_index;
172 0 : start_index &= 32 - 1;
173 : }
174 :
175 : }
176 0 : }
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 : */
186 0 : static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
187 : void *dst1, u32 fgcolor, u32 bgcolor)
188 : {
189 0 : u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
190 0 : u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
191 : u32 bit_mask, eorx, shift;
192 0 : 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 0 : switch (bpp) {
200 : case 8:
201 : tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
202 : tablen = 16;
203 : break;
204 : case 16:
205 0 : tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
206 0 : tablen = 4;
207 : break;
208 : case 32:
209 0 : tab = cfb_tab32;
210 0 : tablen = 2;
211 : break;
212 : default:
213 0 : return;
214 : }
215 :
216 0 : for (i = ppw-1; i--; ) {
217 0 : fgx <<= bpp;
218 0 : bgx <<= bpp;
219 0 : fgx |= fgcolor;
220 0 : bgx |= bgcolor;
221 : }
222 :
223 0 : bit_mask = (1 << ppw) - 1;
224 0 : eorx = fgx ^ bgx;
225 0 : k = image->width/ppw;
226 :
227 0 : for (i = 0; i < tablen; ++i)
228 0 : colortab[i] = (tab[i] & eorx) ^ bgx;
229 :
230 0 : for (i = image->height; i--; ) {
231 0 : dst = dst1;
232 0 : shift = 8;
233 0 : 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 0 : switch (ppw) {
241 : case 4: /* 8 bpp */
242 0 : for (j = k; j >= 2; j -= 2, ++src) {
243 0 : *dst++ = colortab[(*src >> 4) & bit_mask];
244 0 : *dst++ = colortab[(*src >> 0) & bit_mask];
245 : }
246 : break;
247 : case 2: /* 16 bpp */
248 0 : for (j = k; j >= 4; j -= 4, ++src) {
249 0 : *dst++ = colortab[(*src >> 6) & bit_mask];
250 0 : *dst++ = colortab[(*src >> 4) & bit_mask];
251 0 : *dst++ = colortab[(*src >> 2) & bit_mask];
252 0 : *dst++ = colortab[(*src >> 0) & bit_mask];
253 : }
254 : break;
255 : case 1: /* 32 bpp */
256 0 : for (j = k; j >= 8; j -= 8, ++src) {
257 0 : *dst++ = colortab[(*src >> 7) & bit_mask];
258 0 : *dst++ = colortab[(*src >> 6) & bit_mask];
259 0 : *dst++ = colortab[(*src >> 5) & bit_mask];
260 0 : *dst++ = colortab[(*src >> 4) & bit_mask];
261 0 : *dst++ = colortab[(*src >> 3) & bit_mask];
262 0 : *dst++ = colortab[(*src >> 2) & bit_mask];
263 0 : *dst++ = colortab[(*src >> 1) & bit_mask];
264 0 : *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 0 : for (; j--; ) {
275 0 : shift -= ppw;
276 0 : *dst++ = colortab[(*src >> shift) & bit_mask];
277 0 : if (!shift) {
278 0 : shift = 8;
279 0 : ++src;
280 : }
281 : }
282 :
283 0 : dst1 += p->fix.line_length;
284 0 : s += spitch;
285 : }
286 : }
287 :
288 0 : void sys_imageblit(struct fb_info *p, const struct fb_image *image)
289 : {
290 0 : u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
291 0 : u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
292 0 : u32 width = image->width;
293 0 : u32 dx = image->dx, dy = image->dy;
294 : void *dst1;
295 :
296 0 : if (p->state != FBINFO_STATE_RUNNING)
297 : return;
298 :
299 0 : bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
300 0 : start_index = bitstart & (32 - 1);
301 0 : pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
302 :
303 0 : bitstart /= 8;
304 0 : bitstart &= ~(bpl - 1);
305 0 : dst1 = (void __force *)p->screen_base + bitstart;
306 :
307 0 : if (p->fbops->fb_sync)
308 0 : p->fbops->fb_sync(p);
309 :
310 0 : if (image->depth == 1) {
311 0 : if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
312 : p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
313 0 : fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
314 0 : bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
315 : } else {
316 0 : fgcolor = image->fg_color;
317 0 : bgcolor = image->bg_color;
318 : }
319 :
320 0 : if (32 % bpp == 0 && !start_index && !pitch_index &&
321 0 : ((width & (32/bpp-1)) == 0) &&
322 0 : bpp >= 8 && bpp <= 32)
323 0 : fast_imageblit(image, p, dst1, fgcolor, bgcolor);
324 : else
325 0 : slow_imageblit(image, p, dst1, fgcolor, bgcolor,
326 : start_index, pitch_index);
327 : } else
328 0 : color_imageblit(image, p, dst1, start_index, pitch_index);
329 : }
330 :
331 : EXPORT_SYMBOL(sys_imageblit);
332 :
333 : MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
334 : MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
335 : MODULE_LICENSE("GPL");
336 :
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