286 lines · c
1/*2 * linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for3 * interleaved bitplanes à la Atari (44 * planes, 2 bytes interleave)5 *6 * Created 5 Apr 1997 by Geert Uytterhoeven7 *8 * This file is subject to the terms and conditions of the GNU General Public9 * License. See the file COPYING in the main directory of this archive for10 * 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 421#include "atafb_utils.h"22 23void 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 and28 * destination, start at even addresses or both are at odd29 * addresses, just the first odd and last even column (if present)30 * require special treatment (memmove_col()). The rest between31 * then can be copied by normal operations, because all adjacent32 * bytes are affected and are to be stored in the same order.33 * The pathological case is when the move should go from an odd34 * address to an even or vice versa. Since the bytes in the plane35 * words must be assembled in new order, it seems wisest to make36 * 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 206void 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 252void 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