1 /* 2 * linux/drivers/video/iplan2p2.c -- Low level frame buffer operations for 3 * interleaved bitplanes à la Atari (2 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 2 21 #include "atafb_utils.h" 22 23 void atafb_iplan2p2_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 } else { 129 pval[0] = dst32[0] & mask; 130 } 131 132 for (j = w; j > 0; j--) { 133 v = *src32++; 134 v1 = v & mask; 135 *dst32++ = pval[0] | (v1 >> 8); 136 pval[0] = (v ^ v1) << 8; 137 } 138 139 if (f & 2) { 140 dst32[0] = (dst32[0] & mask) | pval[0]; 141 } 142 143 src += next_line; 144 dst += next_line; 145 } 146 } else { 147 u32 *src32, *dst32; 148 u32 pval[4], v, v1, mask; 149 int i, j, w, f; 150 151 src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL); 152 dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL); 153 154 mask = 0xff00ff; 155 f = 0; 156 w = width; 157 if ((dx + width) & 15) 158 f = 1; 159 if (sx & 15) { 160 f |= 2; 161 w += 8; 162 } 163 w >>= 4; 164 for (i = height; i; i--) { 165 src32 = (u32 *)src; 166 dst32 = (u32 *)dst; 167 168 if (f & 1) { 169 pval[0] = dst32[-1] & mask; 170 } else { 171 pval[0] = (*--src32 >> 8) & mask; 172 } 173 174 for (j = w; j > 0; j--) { 175 v = *--src32; 176 v1 = v & mask; 177 *--dst32 = pval[0] | (v1 << 8); 178 pval[0] = (v ^ v1) >> 8; 179 } 180 181 if (!(f & 2)) { 182 dst32[-1] = (dst32[-1] & mask) | pval[0]; 183 } 184 185 src -= next_line; 186 dst -= next_line; 187 } 188 } 189 } 190 } 191 192 void atafb_iplan2p2_fillrect(struct fb_info *info, u_long next_line, u32 color, 193 int sy, int sx, int height, int width) 194 { 195 u32 *dest; 196 int rows, i; 197 u32 cval[4]; 198 199 dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL)); 200 if (sx & 15) { 201 u8 *dest8 = (u8 *)dest + 1; 202 203 expand8_col2mask(color, cval); 204 205 for (i = height; i; i--) { 206 fill8_col(dest8, cval); 207 dest8 += next_line; 208 } 209 dest += BPL / 2; 210 width -= 8; 211 } 212 213 expand16_col2mask(color, cval); 214 rows = width >> 4; 215 if (rows) { 216 u32 *d = dest; 217 u32 off = next_line - rows * BPL * 2; 218 for (i = height; i; i--) { 219 d = fill16_col(d, rows, cval); 220 d = (u32 *)((long)d + off); 221 } 222 dest += rows * BPL / 2; 223 width &= 15; 224 } 225 226 if (width) { 227 u8 *dest8 = (u8 *)dest; 228 229 expand8_col2mask(color, cval); 230 231 for (i = height; i; i--) { 232 fill8_col(dest8, cval); 233 dest8 += next_line; 234 } 235 } 236 } 237 238 void atafb_iplan2p2_linefill(struct fb_info *info, u_long next_line, 239 int dy, int dx, u32 width, 240 const u8 *data, u32 bgcolor, u32 fgcolor) 241 { 242 u32 *dest; 243 const u16 *data16; 244 int rows; 245 u32 fgm[4], bgm[4], m; 246 247 dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL)); 248 if (dx & 15) { 249 fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++); 250 dest += BPL / 2; 251 width -= 8; 252 } 253 254 if (width >= 16) { 255 data16 = (const u16 *)data; 256 expand16_2col2mask(fgcolor, bgcolor, fgm, bgm); 257 258 for (rows = width / 16; rows; rows--) { 259 u16 d = *data16++; 260 m = d | ((u32)d << 16); 261 *dest++ = (m & fgm[0]) ^ bgm[0]; 262 } 263 264 data = (const u8 *)data16; 265 width &= 15; 266 } 267 268 if (width) 269 fill8_2col((u8 *)dest, fgcolor, bgcolor, *data); 270 } 271