309 lines
7.1 KiB
C
309 lines
7.1 KiB
C
/*
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* linux/drivers/video/iplan2p4.c -- Low level frame buffer operations for
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* interleaved bitplanes à la Atari (4
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* planes, 2 bytes interleave)
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*
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* Created 5 Apr 1997 by Geert Uytterhoeven
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fb.h>
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#include <asm/setup.h>
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#include "atafb.h"
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#define BPL 4
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#include "atafb_utils.h"
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void atafb_iplan2p4_copyarea(struct fb_info *info, u_long next_line,
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int sy, int sx, int dy, int dx,
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int height, int width)
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{
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/* bmove() has to distinguish two major cases: If both, source and
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* destination, start at even addresses or both are at odd
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* addresses, just the first odd and last even column (if present)
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* require special treatment (memmove_col()). The rest between
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* then can be copied by normal operations, because all adjacent
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* bytes are affected and are to be stored in the same order.
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* The pathological case is when the move should go from an odd
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* address to an even or vice versa. Since the bytes in the plane
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* words must be assembled in new order, it seems wisest to make
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* all movements by memmove_col().
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*/
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u8 *src, *dst;
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u32 *s, *d;
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int w, l , i, j;
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u_int colsize;
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u_int upwards = (dy < sy) || (dy == sy && dx < sx);
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colsize = height;
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if (!((sx ^ dx) & 15)) {
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/* odd->odd or even->even */
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if (upwards) {
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src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
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dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
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if (sx & 15) {
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memmove32_col(dst, src, 0xff00ff, height, next_line - BPL * 2);
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src += BPL * 2;
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dst += BPL * 2;
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width -= 8;
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}
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w = width >> 4;
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if (w) {
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s = (u32 *)src;
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d = (u32 *)dst;
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w *= BPL / 2;
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l = next_line - w * 4;
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for (j = height; j > 0; j--) {
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for (i = w; i > 0; i--)
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*d++ = *s++;
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s = (u32 *)((u8 *)s + l);
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d = (u32 *)((u8 *)d + l);
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}
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}
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if (width & 15)
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memmove32_col(dst + width / (8 / BPL), src + width / (8 / BPL),
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0xff00ff00, height, next_line - BPL * 2);
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} else {
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src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
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dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
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if ((sx + width) & 15) {
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src -= BPL * 2;
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dst -= BPL * 2;
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memmove32_col(dst, src, 0xff00ff00, colsize, -next_line - BPL * 2);
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width -= 8;
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}
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w = width >> 4;
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if (w) {
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s = (u32 *)src;
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d = (u32 *)dst;
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w *= BPL / 2;
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l = next_line - w * 4;
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for (j = height; j > 0; j--) {
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for (i = w; i > 0; i--)
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*--d = *--s;
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s = (u32 *)((u8 *)s - l);
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d = (u32 *)((u8 *)d - l);
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}
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}
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if (sx & 15)
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memmove32_col(dst - (width - 16) / (8 / BPL),
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src - (width - 16) / (8 / BPL),
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0xff00ff, colsize, -next_line - BPL * 2);
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}
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} else {
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/* odd->even or even->odd */
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if (upwards) {
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u32 *src32, *dst32;
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u32 pval[4], v, v1, mask;
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int i, j, w, f;
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src = (u8 *)info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL);
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dst = (u8 *)info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL);
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mask = 0xff00ff00;
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f = 0;
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w = width;
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if (sx & 15) {
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f = 1;
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w += 8;
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}
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if ((sx + width) & 15)
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f |= 2;
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w >>= 4;
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for (i = height; i; i--) {
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src32 = (u32 *)src;
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dst32 = (u32 *)dst;
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if (f & 1) {
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pval[0] = (*src32++ << 8) & mask;
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pval[1] = (*src32++ << 8) & mask;
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} else {
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pval[0] = dst32[0] & mask;
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pval[1] = dst32[1] & mask;
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}
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for (j = w; j > 0; j--) {
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v = *src32++;
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v1 = v & mask;
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*dst32++ = pval[0] | (v1 >> 8);
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pval[0] = (v ^ v1) << 8;
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v = *src32++;
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v1 = v & mask;
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*dst32++ = pval[1] | (v1 >> 8);
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pval[1] = (v ^ v1) << 8;
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}
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if (f & 2) {
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dst32[0] = (dst32[0] & mask) | pval[0];
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dst32[1] = (dst32[1] & mask) | pval[1];
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}
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src += next_line;
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dst += next_line;
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}
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} else {
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u32 *src32, *dst32;
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u32 pval[4], v, v1, mask;
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int i, j, w, f;
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src = (u8 *)info->screen_base + (sy - 1) * next_line + ((sx + width + 8) & ~15) / (8 / BPL);
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dst = (u8 *)info->screen_base + (dy - 1) * next_line + ((dx + width + 8) & ~15) / (8 / BPL);
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mask = 0xff00ff;
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f = 0;
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w = width;
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if ((dx + width) & 15)
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f = 1;
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if (sx & 15) {
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f |= 2;
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w += 8;
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}
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w >>= 4;
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for (i = height; i; i--) {
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src32 = (u32 *)src;
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dst32 = (u32 *)dst;
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if (f & 1) {
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pval[0] = dst32[-1] & mask;
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pval[1] = dst32[-2] & mask;
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} else {
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pval[0] = (*--src32 >> 8) & mask;
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pval[1] = (*--src32 >> 8) & mask;
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}
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for (j = w; j > 0; j--) {
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v = *--src32;
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v1 = v & mask;
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*--dst32 = pval[0] | (v1 << 8);
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pval[0] = (v ^ v1) >> 8;
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v = *--src32;
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v1 = v & mask;
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*--dst32 = pval[1] | (v1 << 8);
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pval[1] = (v ^ v1) >> 8;
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}
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if (!(f & 2)) {
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dst32[-1] = (dst32[-1] & mask) | pval[0];
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dst32[-2] = (dst32[-2] & mask) | pval[1];
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}
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src -= next_line;
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dst -= next_line;
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}
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}
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}
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}
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void atafb_iplan2p4_fillrect(struct fb_info *info, u_long next_line, u32 color,
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int sy, int sx, int height, int width)
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{
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u32 *dest;
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int rows, i;
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u32 cval[4];
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dest = (u32 *)(info->screen_base + sy * next_line + (sx & ~15) / (8 / BPL));
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if (sx & 15) {
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u8 *dest8 = (u8 *)dest + 1;
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expand8_col2mask(color, cval);
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for (i = height; i; i--) {
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fill8_col(dest8, cval);
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dest8 += next_line;
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}
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dest += BPL / 2;
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width -= 8;
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}
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expand16_col2mask(color, cval);
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rows = width >> 4;
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if (rows) {
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u32 *d = dest;
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u32 off = next_line - rows * BPL * 2;
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for (i = height; i; i--) {
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d = fill16_col(d, rows, cval);
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d = (u32 *)((long)d + off);
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}
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dest += rows * BPL / 2;
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width &= 15;
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}
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if (width) {
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u8 *dest8 = (u8 *)dest;
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expand8_col2mask(color, cval);
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for (i = height; i; i--) {
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fill8_col(dest8, cval);
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dest8 += next_line;
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}
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}
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}
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void atafb_iplan2p4_linefill(struct fb_info *info, u_long next_line,
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int dy, int dx, u32 width,
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const u8 *data, u32 bgcolor, u32 fgcolor)
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{
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u32 *dest;
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const u16 *data16;
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int rows;
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u32 fgm[4], bgm[4], m;
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dest = (u32 *)(info->screen_base + dy * next_line + (dx & ~15) / (8 / BPL));
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if (dx & 15) {
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fill8_2col((u8 *)dest + 1, fgcolor, bgcolor, *data++);
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dest += BPL / 2;
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width -= 8;
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}
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if (width >= 16) {
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data16 = (const u16 *)data;
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expand16_2col2mask(fgcolor, bgcolor, fgm, bgm);
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for (rows = width / 16; rows; rows--) {
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u16 d = *data16++;
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m = d | ((u32)d << 16);
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*dest++ = (m & fgm[0]) ^ bgm[0];
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*dest++ = (m & fgm[1]) ^ bgm[1];
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}
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data = (const u8 *)data16;
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width &= 15;
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}
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if (width)
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fill8_2col((u8 *)dest, fgcolor, bgcolor, *data);
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}
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#ifdef MODULE
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MODULE_LICENSE("GPL");
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int init_module(void)
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{
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return 0;
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}
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void cleanup_module(void)
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{
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}
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#endif /* MODULE */
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/*
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* Visible symbols for modules
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*/
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EXPORT_SYMBOL(atafb_iplan2p4_copyarea);
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EXPORT_SYMBOL(atafb_iplan2p4_fillrect);
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EXPORT_SYMBOL(atafb_iplan2p4_linefill);
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