1 /* 2 * linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for 3 * interleaved bitplanes à la Atari (4 4 * planes, 2 bytes interleave) 5 * 6 * Created 5 Apr 1997 by Geert Uytterhoeven 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file COPYING in the main directory of this archive for 10 * more details. 11 */ 12 13 #include <linux/string.h> 14 #include <linux/fb.h> 15 16 #include <asm/setup.h> 17 18 #include "atafb.h" 19 20 #define BPL 4 21 #include "atafb_utils.h" 22 23 void atafb_iplan2p4_copyarea(struct fb_info *info, u_long next_line, 24 int sy, int sx, int dy, int dx, 25 int height, int width) 26 { 27 /* bmove() has to distinguish two major cases: If both, source and 28 * destination, start at even addresses or both are at odd 29 * addresses, just the first odd and last even column (if present) 30 * require special treatment (memmove_col()). The rest between 31 * then can be copied by normal operations, because all adjacent 32 * bytes are affected and are to be stored in the same order. 33 * The pathological case is when the move should go from an odd 34 * address to an even or vice versa. Since the bytes in the plane 35 * words must be assembled in new order, it seems wisest to make 36 * all movements by memmove_col(). 37 */ 38 39 u8 *src, *dst; 40 u32 *s, *d; 41 int w, l , i, j; 42 u_int colsize; 43 u_int upwards = (dy < sy) || (dy == sy && dx < sx); 44 45 colsize = height; 46 if (!((sx ^ dx) & 15)) { 47 /* odd->odd or even->even */ 48 49 if (upwards) { 50 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL); 51 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL); 52 if (sx & 15) { 53 memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2); 54 src += BPL * 2; 55 dst += BPL * 2; 56 width -= 8; 57 } 58 w = width >> 4; 59 if (w) { 60 s = (u32 *)src; 61 d = (u32 *)dst; 62 w *= BPL / 2; 63 l = next_line - w * 4; 64 for (j = height; j > 0; j--) { 65 for (i = w; i > 0; i--) 66 *d++ = *s++; 67 s = (u32 *)((u8 *)s + l); 68 d = (u32 *)((u8 *)d + l); 69 } 70 } 71 if (width & 15) 72 memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL), 73 0xff00ff00, height, next_line - BPL * 2); 74 } else { 75 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL); 76 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL); 77 78 if ((sx + width) & 15) { 79 src -= BPL * 2; 80 dst -= BPL * 2; 81 memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2); 82 width -= 8; 83 } 84 w = width >> 4; 85 if (w) { 86 s = (u32 *)src; 87 d = (u32 *)dst; 88 w *= BPL / 2; 89 l = next_line - w * 4; 90 for (j = height; j > 0; j--) { 91 for (i = w; i > 0; i--) 92 *--d = *--s; 93 s = (u32 *)((u8 *)s - l); 94 d = (u32 *)((u8 *)d - l); 95 } 96 } 97 if (sx & 15) 98 memmove32_col(dst - (width - 16) / (8 / BPL), 99 src - (width - 16) / (8 / BPL), 100 0xff00ff, colsize, -next_line - BPL * 2); 101 } 102 } else { 103 /* odd->even or even->odd */ 104 if (upwards) { 105 u32 *src32, *dst32; 106 u32 pval[4], v, v1, mask; 107 int i, j, w, f; 108 109 src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL); 110 dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL); 111 112 mask = 0xff00ff00; 113 f = 0; 114 w = width; 115 if (sx & 15) { 116 f = 1; 117 w += 8; 118 } 119 if ((sx + width) & 15) 120 f |= 2; 121 w >>= 4; 122 for (i = height; i; i--) { 123 src32 = (u32 *)src; 124 dst32 = (u32 *)dst; 125 126 if (f & 1) { 127 pval[0] = (*src32++ << 8) & mask; 128 pval[1] = (*src32++ << 8) & mask; 129 } else { 130 pval[0] = dst32[0] & mask; 131 pval[1] = dst32[1] & mask; 132 } 133 134 for (j = w; j > 0; j--) { 135 v = *src32++; 136 v1 = v & mask; 137 *dst32++ = pval[0] | (v1 >> 8); 138 pval[0] = (v ^ v1) << 8; 139 v = *src32++; 140 v1 = v & mask; 141 *dst32++ = pval[1] | (v1 >> 8); 142 pval[1] = (v ^ v1) << 8; 143 } 144 145 if (f & 2) { 146 dst32[0] = (dst32[0] & mask) | pval[0]; 147 dst32[1] = (dst32[1] & mask) | pval[1]; 148 } 149 150 src += next_line; 151 dst += next_line; 152 } 153 } else { 154 u32 *src32, *dst32; 155 u32 pval[4], v, v1, mask; 156 int i, j, w, f; 157 158 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL); 159 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL); 160 161 mask = 0xff00ff; 162 f = 0; 163 w = width; 164 if ((dx + width) & 15) 165 f = 1; 166 if (sx & 15) { 167 f |= 2; 168 w += 8; 169 } 170 w >>= 4; 171 for (i = height; i; i--) { 172 src32 = (u32 *)src; 173 dst32 = (u32 *)dst; 174 175 if (f & 1) { 176 pval[0] = dst32[-1] & mask; 177 pval[1] = dst32[-2] & mask; 178 } else { 179 pval[0] = (*--src32 >> 8) & mask; 180 pval[1] = (*--src32 >> 8) & mask; 181 } 182 183 for (j = w; j > 0; j--) { 184 v = *--src32; 185 v1 = v & mask; 186 *--dst32 = pval[0] | (v1 << 8); 187 pval[0] = (v ^ v1) >> 8; 188 v = *--src32; 189 v1 = v & mask; 190 *--dst32 = pval[1] | (v1 << 8); 191 pval[1] = (v ^ v1) >> 8; 192 } 193 194 if (!(f & 2)) { 195 dst32[-1] = (dst32[-1] & mask) | pval[0]; 196 dst32[-2] = (dst32[-2] & mask) | pval[1]; 197 } 198 199 src -= next_line; 200 dst -= next_line; 201 } 202 } 203 } 204 } 205 206 void atafb_iplan2p4_fillrect(struct fb_info *info, u_long next_line, u32 color, 207 int sy, int sx, int height, int width) 208 { 209 u32 *dest; 210 int rows, i; 211 u32 cval[4]; 212 213 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL)); 214 if (sx & 15) { 215 u8 *dest8 = (u8 *)dest + 1; 216 217 expand8_col2mask(color, cval); 218 219 for (i = height; i; i--) { 220 fill8_col(dest8, cval); 221 dest8 += next_line; 222 } 223 dest += BPL / 2; 224 width -= 8; 225 } 226 227 expand16_col2mask(color, cval); 228 rows = width >> 4; 229 if (rows) { 230 u32 *d = dest; 231 u32 off = next_line - rows * BPL * 2; 232 for (i = height; i; i--) { 233 d = fill16_col(d, rows, cval); 234 d = (u32 *)((long)d + off); 235 } 236 dest += rows * BPL / 2; 237 width &= 15; 238 } 239 240 if (width) { 241 u8 *dest8 = (u8 *)dest; 242 243 expand8_col2mask(color, cval); 244 245 for (i = height; i; i--) { 246 fill8_col(dest8, cval); 247 dest8 += next_line; 248 } 249 } 250 } 251 252 void atafb_iplan2p4_linefill(struct fb_info *info, u_long next_line, 253 int dy, int dx, u32 width, 254 const u8 *data, u32 bgcolor, u32 fgcolor) 255 { 256 u32 *dest; 257 const u16 *data16; 258 int rows; 259 u32 fgm[4], bgm[4], m; 260 261 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL)); 262 if (dx & 15) { 263 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++); 264 dest += BPL / 2; 265 width -= 8; 266 } 267 268 if (width >= 16) { 269 data16 = (const u16 *)data; 270 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm); 271 272 for (rows = width / 16; rows; rows--) { 273 u16 d = *data16++; 274 m = d | ((u32)d << 16); 275 *dest++ = (m & fgm[0]) ^ bgm[0]; 276 *dest++ = (m & fgm[1]) ^ bgm[1]; 277 } 278 279 data = (const u8 *)data16; 280 width &= 15; 281 } 282 283 if (width) 284 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data); 285 } 286