drivers/video/sysimgblt.c

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