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 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 } 110 111 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 */ 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, eorx, shift; 192 const char *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(p) ? cfb_tab8_be : cfb_tab8_le; 202 tablen = 16; 203 break; 204 case 16: 205 tab = fb_be_math(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 } 287 288 void 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 bitstart = (dy * p->fix.line_length * 8) + (dx * bpp); 300 start_index = bitstart & (32 - 1); 301 pitch_index = (p->fix.line_length & (bpl - 1)) * 8; 302 303 bitstart /= 8; 304 bitstart &= ~(bpl - 1); 305 dst1 = (void __force *)p->screen_base + bitstart; 306 307 if (p->fbops->fb_sync) 308 p->fbops->fb_sync(p); 309 310 if (image->depth == 1) { 311 if (p->fix.visual == FB_VISUAL_TRUECOLOR || 312 p->fix.visual == FB_VISUAL_DIRECTCOLOR) { 313 fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color]; 314 bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color]; 315 } else { 316 fgcolor = image->fg_color; 317 bgcolor = image->bg_color; 318 } 319 320 if (32 % bpp == 0 && !start_index && !pitch_index && 321 ((width & (32/bpp-1)) == 0) && 322 bpp >= 8 && bpp <= 32) 323 fast_imageblit(image, p, dst1, fgcolor, bgcolor); 324 else 325 slow_imageblit(image, p, dst1, fgcolor, bgcolor, 326 start_index, pitch_index); 327 } else 328 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"); 336 337