tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
26static 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
42static 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
52static const u32 cfb_tab32[] = {
53 0x00000000, 0xffffffff
54};
55
56static 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
115static 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 */
189static 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
243void 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
286EXPORT_SYMBOL(sys_imageblit);
287
288MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
289MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
290MODULE_LICENSE("GPL");
291