drivers/video/cfbimgblt.c

   1 /*
   2  *  Generic BitBLT function for frame buffer with packed pixels of any depth.
   3  *
   4  *      Copyright (C)  June 1999 James Simmons
   5  *
   6  *  This file is subject to the terms and conditions of the GNU General Public
   7  *  License.  See the file COPYING in the main directory of this archive for
   8  *  more details.
   9  *
  10  * NOTES:
  11  *
  12  *    This function copys a image from system memory to video memory. The
  13  *  image can be a bitmap where each 0 represents the background color and
  14  *  each 1 represents the foreground color. Great for font handling. It can
  15  *  also be a color image. This is determined by image_depth. The color image
  16  *  must be laid out exactly in the same format as the framebuffer. Yes I know
  17  *  their are cards with hardware that coverts images of various depths to the
  18  *  framebuffer depth. But not every card has this. All images must be rounded
  19  *  up to the nearest byte. For example a bitmap 12 bits wide must be two
  20  *  bytes width.
  21  *
  22  *  Tony:
  23  *  Incorporate mask tables similar to fbcon-cfb*.c in 2.4 API.  This speeds
  24  *  up the code significantly.
  25  *
  26  *  Code for depths not multiples of BITS_PER_LONG is still kludgy, which is
  27  *  still processed a bit at a time.
  28  *
  29  *  Also need to add code to deal with cards endians that are different than
  30  *  the native cpu endians. I also need to deal with MSB position in the word.
  31  */
  32 #include <linux/module.h>
  33 #include <linux/string.h>
  34 #include <linux/fb.h>
  35 #include <asm/types.h>
  36
  37 #define DEBUG
  38
  39 #ifdef DEBUG
  40 #define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt,__FUNCTION__,## args)
  41 #else
  42 #define DPRINTK(fmt, args...)
  43 #endif
  44
  45 static const u32 cfb_tab8[] = {
  46 #if defined(__BIG_ENDIAN)
  47     0x00000000,0x000000ff,0x0000ff00,0x0000ffff,
  48     0x00ff0000,0x00ff00ff,0x00ffff00,0x00ffffff,
  49     0xff000000,0xff0000ff,0xff00ff00,0xff00ffff,
  50     0xffff0000,0xffff00ff,0xffffff00,0xffffffff
  51 #elif defined(__LITTLE_ENDIAN)
  52     0x00000000,0xff000000,0x00ff0000,0xffff0000,
  53     0x0000ff00,0xff00ff00,0x00ffff00,0xffffff00,
  54     0x000000ff,0xff0000ff,0x00ff00ff,0xffff00ff,
  55     0x0000ffff,0xff00ffff,0x00ffffff,0xffffffff
  56 #else
  57 #error FIXME: No endianness??
  58 #endif
  59 };
  60
  61 static const u32 cfb_tab16[] = {
  62 #if defined(__BIG_ENDIAN)
  63     0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff
  64 #elif defined(__LITTLE_ENDIAN)
  65     0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
  66 #else
  67 #error FIXME: No endianness??
  68 #endif
  69 };
  70
  71 static const u32 cfb_tab32[] = {
  72         0x00000000, 0xffffffff
  73 };
  74
  75 #define FB_WRITEL fb_writel
  76 #define FB_READL  fb_readl
  77
  78 static inline void color_imageblit(const struct fb_image *image,
  79                                    struct fb_info *p, u8 __iomem *dst1,
  80                                    u32 start_index,
  81                                    u32 pitch_index)
  82 {
  83         /* Draw the penguin */
  84         u32 __iomem *dst, *dst2;
  85         u32 color = 0, val, shift;
  86         int i, n, bpp = p->var.bits_per_pixel;
  87         u32 null_bits = 32 - bpp;
  88         u32 *palette = (u32 *) p->pseudo_palette;
  89         const u8 *src = image->data;
  90
  91         dst2 = (u32 __iomem *) dst1;
  92         for (i = image->height; i--; ) {
  93                 n = image->width;
  94                 dst = (u32 __iomem *) dst1;
  95                 shift = 0;
  96                 val = 0;
  97
  98                 if (start_index) {
  99                         u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0, start_index));
 100                         val = FB_READL(dst) & start_mask;
 101                         shift = start_index;
 102                 }
 103                 while (n--) {
 104                         if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
 105                             p->fix.visual == FB_VISUAL_DIRECTCOLOR )
 106                                 color = palette[*src];
 107                         else
 108                                 color = *src;
 109                         color <<= FB_LEFT_POS(bpp);
 110                         val |= FB_SHIFT_HIGH(color, shift);
 111                         if (shift >= null_bits) {
 112                                 FB_WRITEL(val, dst++);
 113
 114                                 val = (shift == null_bits) ? 0 :
 115                                         FB_SHIFT_LOW(color, 32 - shift);
 116                         }
 117                         shift += bpp;
 118                         shift &= (32 - 1);
 119                         src++;
 120                 }
 121                 if (shift) {
 122                         u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
 123
 124                         FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
 125                 }
 126                 dst1 += p->fix.line_length;
 127                 if (pitch_index) {
 128                         dst2 += p->fix.line_length;
 129                         dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
 130
 131                         start_index += pitch_index;
 132                         start_index &= 32 - 1;
 133                 }
 134         }
 135 }
 136
 137 static inline void slow_imageblit(const struct fb_image *image, struct fb_info *p,
 138                                   u8 __iomem *dst1, u32 fgcolor,
 139                                   u32 bgcolor,
 140                                   u32 start_index,
 141                                   u32 pitch_index)
 142 {
 143         u32 shift, color = 0, bpp = p->var.bits_per_pixel;
 144         u32 __iomem *dst, *dst2;
 145         u32 val, pitch = p->fix.line_length;
 146         u32 null_bits = 32 - bpp;
 147         u32 spitch = (image->width+7)/8;
 148         const u8 *src = image->data, *s;
 149         u32 i, j, l;
 150
 151         dst2 = (u32 __iomem *) dst1;
 152         fgcolor <<= FB_LEFT_POS(bpp);
 153         bgcolor <<= FB_LEFT_POS(bpp);
 154
 155         for (i = image->height; i--; ) {
 156                 shift = val = 0;
 157                 l = 8;
 158                 j = image->width;
 159                 dst = (u32 __iomem *) dst1;
 160                 s = src;
 161
 162                 /* write leading bits */
 163                 if (start_index) {
 164                         u32 start_mask = ~(FB_SHIFT_HIGH(~(u32)0,start_index));
 165                         val = FB_READL(dst) & start_mask;
 166                         shift = start_index;
 167                 }
 168
 169                 while (j--) {
 170                         l--;
 171                         color = (*s & (1 << l)) ? fgcolor : bgcolor;
 172                         val |= FB_SHIFT_HIGH(color, shift);
 173
 174                         /* Did the bitshift spill bits to the next long? */
 175                         if (shift >= null_bits) {
 176                                 FB_WRITEL(val, dst++);
 177                                 val = (shift == null_bits) ? 0 :
 178                                         FB_SHIFT_LOW(color,32 - shift);
 179                         }
 180                         shift += bpp;
 181                         shift &= (32 - 1);
 182                         if (!l) { l = 8; s++; };
 183                 }
 184
 185                 /* write trailing bits */
 186                 if (shift) {
 187                         u32 end_mask = FB_SHIFT_HIGH(~(u32)0, shift);
 188
 189                         FB_WRITEL((FB_READL(dst) & end_mask) | val, dst);
 190                 }
 191
 192                 dst1 += pitch;
 193                 src += spitch;
 194                 if (pitch_index) {
 195                         dst2 += pitch;
 196                         dst1 = (u8 __iomem *)((long __force)dst2 & ~(sizeof(u32) - 1));
 197                         start_index += pitch_index;
 198                         start_index &= 32 - 1;
 199                 }
 200
 201         }
 202 }
 203
 204 /*
 205  * fast_imageblit - optimized monochrome color expansion
 206  *
 207  * Only if:  bits_per_pixel == 8, 16, or 32
 208  *           image->width is divisible by pixel/dword (ppw);
 209  *           fix->line_legth is divisible by 4;
 210  *           beginning and end of a scanline is dword aligned
 211  */
 212 static inline void fast_imageblit(const struct fb_image *image, struct fb_info *p,
 213                                   u8 __iomem *dst1, u32 fgcolor,
 214                                   u32 bgcolor)
 215 {
 216         u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
 217         u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
 218         u32 bit_mask, end_mask, eorx, shift;
 219         const char *s = image->data, *src;
 220         u32 __iomem *dst;
 221         const u32 *tab = NULL;
 222         int i, j, k;
 223
 224         switch (bpp) {
 225         case 8:
 226                 tab = cfb_tab8;
 227                 break;
 228         case 16:
 229                 tab = cfb_tab16;
 230                 break;
 231         case 32:
 232         default:
 233                 tab = cfb_tab32;
 234                 break;
 235         }
 236
 237         for (i = ppw-1; i--; ) {
 238                 fgx <<= bpp;
 239                 bgx <<= bpp;
 240                 fgx |= fgcolor;
 241                 bgx |= bgcolor;
 242         }
 243
 244         bit_mask = (1 << ppw) - 1;
 245         eorx = fgx ^ bgx;
 246         k = image->width/ppw;
 247
 248         for (i = image->height; i--; ) {
 249                 dst = (u32 __iomem *) dst1, shift = 8; src = s;
 250
 251                 for (j = k; j--; ) {
 252                         shift -= ppw;
 253                         end_mask = tab[(*src >> shift) & bit_mask];
 254                         FB_WRITEL((end_mask & eorx)^bgx, dst++);
 255                         if (!shift) { shift = 8; src++; }
 256                 }
 257                 dst1 += p->fix.line_length;
 258                 s += spitch;
 259         }
 260 }
 261
 262 void cfb_imageblit(struct fb_info *p, const struct fb_image *image)
 263 {
 264         u32 fgcolor, bgcolor, start_index, bitstart, pitch_index = 0;
 265         u32 bpl = sizeof(u32), bpp = p->var.bits_per_pixel;
 266         u32 width = image->width;
 267         u32 dx = image->dx, dy = image->dy;
 268         u8 __iomem *dst1;
 269
 270         if (p->state != FBINFO_STATE_RUNNING)
 271                 return;
 272
 273         bitstart = (dy * p->fix.line_length * 8) + (dx * bpp);
 274         start_index = bitstart & (32 - 1);
 275         pitch_index = (p->fix.line_length & (bpl - 1)) * 8;
 276
 277         bitstart /= 8;
 278         bitstart &= ~(bpl - 1);
 279         dst1 = p->screen_base + bitstart;
 280
 281         if (p->fbops->fb_sync)
 282                 p->fbops->fb_sync(p);
 283
 284         if (image->depth == 1) {
 285                 if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
 286                     p->fix.visual == FB_VISUAL_DIRECTCOLOR) {
 287                         fgcolor = ((u32*)(p->pseudo_palette))[image->fg_color];
 288                         bgcolor = ((u32*)(p->pseudo_palette))[image->bg_color];
 289                 } else {
 290                         fgcolor = image->fg_color;
 291                         bgcolor = image->bg_color;
 292                 }
 293
 294                 if (32 % bpp == 0 && !start_index && !pitch_index &&
 295                     ((width & (32/bpp-1)) == 0) &&
 296                     bpp >= 8 && bpp <= 32)
 297                         fast_imageblit(image, p, dst1, fgcolor, bgcolor);
 298                 else
 299                         slow_imageblit(image, p, dst1, fgcolor, bgcolor,
 300                                         start_index, pitch_index);
 301         } else
 302                 color_imageblit(image, p, dst1, start_index, pitch_index);
 303 }
 304
 305 EXPORT_SYMBOL(cfb_imageblit);
 306
 307 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
 308 MODULE_DESCRIPTION("Generic software accelerated imaging drawing");
 309 MODULE_LICENSE("GPL");
 310