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
color_imageblit(const struct fb_image * image,struct fb_info * p,void * dst1,u32 start_index,u32 pitch_index)52 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 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
slow_imageblit(const struct fb_image * image,struct fb_info * p,void * dst1,u32 fgcolor,u32 bgcolor,u32 start_index,u32 pitch_index)111 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 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 */
fast_imageblit(const struct fb_image * image,struct fb_info * p,void * dst1,u32 fgcolor,u32 bgcolor)186 static 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, end_mask, eorx, shift;
192 const char *s = image->data, *src;
193 u32 *dst;
194 const u32 *tab = NULL;
195 int i, j, k;
196
197 switch (bpp) {
198 case 8:
199 tab = fb_be_math(p) ? cfb_tab8_be : cfb_tab8_le;
200 break;
201 case 16:
202 tab = fb_be_math(p) ? cfb_tab16_be : cfb_tab16_le;
203 break;
204 case 32:
205 default:
206 tab = cfb_tab32;
207 break;
208 }
209
210 for (i = ppw-1; i--; ) {
211 fgx <<= bpp;
212 bgx <<= bpp;
213 fgx |= fgcolor;
214 bgx |= bgcolor;
215 }
216
217 bit_mask = (1 << ppw) - 1;
218 eorx = fgx ^ bgx;
219 k = image->width/ppw;
220
221 for (i = image->height; i--; ) {
222 dst = dst1;
223 shift = 8;
224 src = s;
225
226 for (j = k; j--; ) {
227 shift -= ppw;
228 end_mask = tab[(*src >> shift) & bit_mask];
229 *dst++ = (end_mask & eorx) ^ bgx;
230 if (!shift) {
231 shift = 8;
232 src++;
233 }
234 }
235 dst1 += p->fix.line_length;
236 s += spitch;
237 }
238 }
239
sys_imageblit(struct fb_info * p,const struct fb_image * image)240 void sys_imageblit(struct fb_info *p, const struct fb_image *image)
241 {
242 u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
243 u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
244 u32 width = image->width;
245 u32 dx = image->dx, dy = image->dy;
246 void *dst1;
247
248 if (p->state != FBINFO_STATE_RUNNING)
249 return;
250
251 bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
252 start_index = bitstart & (32 - 1);
253 pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
254
255 bitstart /= 8;
256 bitstart &= ~(bpl - 1);
257 dst1 = (void __force *)p->screen_base + bitstart;
258
259 if (p->fbops->fb_sync)
260 p->fbops->fb_sync(p);
261
262 if (image->depth == 1) {
263 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
264 p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
265 fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
266 bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
267 } else {
268 fgcolor = image->fg_color;
269 bgcolor = image->bg_color;
270 }
271
272 if (32 % bpp == 0 && !start_index && !pitch_index &&
273 ((width & (32/bpp-1)) == 0) &&
274 bpp >= 8 && bpp <= 32)
275 fast_imageblit(image, p, dst1, fgcolor, bgcolor);
276 else
277 slow_imageblit(image, p, dst1, fgcolor, bgcolor,
278 start_index, pitch_index);
279 } else
280 color_imageblit(image, p, dst1, start_index, pitch_index);
281 }
282
283 EXPORT_SYMBOL(sys_imageblit);
284
285 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
286 MODULE_DESCRIPTION("1-bit/8-bit to 1-32 bit color expansion (sys-to-sys)");
287 MODULE_LICENSE("GPL");
288
289