1e4abf1d4c
screen bitmap and within a single MEMBUF were broken when first source line is before the first destination line and the sub-bitmaps overlap. The fix just copies horizontal lines in reverse order when the first source line is before the first destination line. This switches directions unnecessarily in some cases, but the switch is about as fast as doing a precise detection of overlaps. When the first lines are the same, there can be undetected overlap in the horizontal direction. The old code already handles this mostly accidentally by using bcopy() for MEMBUFs and by copying through a temporary buffer for the screen bitmap although the latter is sub-optimal in direct modes.
398 lines
11 KiB
C
398 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991-1997 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <signal.h>
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#include <sys/fbio.h>
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#include "vgl.h"
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#define min(x, y) (((x) < (y)) ? (x) : (y))
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static byte mask[8] = {0xff, 0x7f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01};
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static int color2bit[16] = {0x00000000, 0x00000001, 0x00000100, 0x00000101,
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0x00010000, 0x00010001, 0x00010100, 0x00010101,
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0x01000000, 0x01000001, 0x01000100, 0x01000101,
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0x01010000, 0x01010001, 0x01010100, 0x01010101};
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static void
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WriteVerticalLine(VGLBitmap *dst, int x, int y, int width, byte *line)
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{
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int i, pos, last, planepos, start_offset, end_offset, offset;
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int len;
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unsigned int word = 0;
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byte *address;
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byte *VGLPlane[4];
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switch (dst->Type) {
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case VIDBUF4:
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case VIDBUF4S:
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start_offset = (x & 0x07);
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end_offset = (x + width) & 0x07;
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i = (width + start_offset) / 8;
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if (end_offset)
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i++;
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VGLPlane[0] = VGLBuf;
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VGLPlane[1] = VGLPlane[0] + i;
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VGLPlane[2] = VGLPlane[1] + i;
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VGLPlane[3] = VGLPlane[2] + i;
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pos = 0;
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planepos = 0;
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last = 8 - start_offset;
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while (pos < width) {
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word = 0;
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while (pos < last && pos < width)
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word = (word<<1) | color2bit[line[pos++]&0x0f];
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VGLPlane[0][planepos] = word;
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VGLPlane[1][planepos] = word>>8;
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VGLPlane[2][planepos] = word>>16;
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VGLPlane[3][planepos] = word>>24;
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planepos++;
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last += 8;
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}
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planepos--;
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if (end_offset) {
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word <<= (8 - end_offset);
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VGLPlane[0][planepos] = word;
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VGLPlane[1][planepos] = word>>8;
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VGLPlane[2][planepos] = word>>16;
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VGLPlane[3][planepos] = word>>24;
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}
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if (start_offset || end_offset)
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width+=8;
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width /= 8;
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outb(0x3ce, 0x01); outb(0x3cf, 0x00); /* set/reset enable */
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outb(0x3ce, 0x08); outb(0x3cf, 0xff); /* bit mask */
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for (i=0; i<4; i++) {
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outb(0x3c4, 0x02);
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outb(0x3c5, 0x01<<i);
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outb(0x3ce, 0x04);
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outb(0x3cf, i);
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pos = VGLAdpInfo.va_line_width*y + x/8;
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if (dst->Type == VIDBUF4) {
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if (end_offset)
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VGLPlane[i][planepos] |= dst->Bitmap[pos+planepos] & mask[end_offset];
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if (start_offset)
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VGLPlane[i][0] |= dst->Bitmap[pos] & ~mask[start_offset];
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bcopy(&VGLPlane[i][0], dst->Bitmap + pos, width);
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} else { /* VIDBUF4S */
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if (end_offset) {
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offset = VGLSetSegment(pos + planepos);
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VGLPlane[i][planepos] |= dst->Bitmap[offset] & mask[end_offset];
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}
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offset = VGLSetSegment(pos);
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if (start_offset)
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VGLPlane[i][0] |= dst->Bitmap[offset] & ~mask[start_offset];
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for (last = width; ; ) {
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len = min(VGLAdpInfo.va_window_size - offset, last);
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bcopy(&VGLPlane[i][width - last], dst->Bitmap + offset, len);
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pos += len;
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last -= len;
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if (last <= 0)
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break;
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offset = VGLSetSegment(pos);
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}
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}
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}
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break;
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case VIDBUF8X:
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address = dst->Bitmap + VGLAdpInfo.va_line_width * y + x/4;
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for (i=0; i<4; i++) {
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outb(0x3c4, 0x02);
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outb(0x3c5, 0x01 << ((x + i)%4));
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for (planepos=0, pos=i; pos<width; planepos++, pos+=4)
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address[planepos] = line[pos];
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if ((x + i)%4 == 3)
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++address;
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}
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break;
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case VIDBUF8S:
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case VIDBUF16S:
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case VIDBUF24S:
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case VIDBUF32S:
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width = width * dst->PixelBytes;
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pos = (dst->VXsize * y + x) * dst->PixelBytes;
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while (width > 0) {
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offset = VGLSetSegment(pos);
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i = min(VGLAdpInfo.va_window_size - offset, width);
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bcopy(line, dst->Bitmap + offset, i);
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line += i;
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pos += i;
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width -= i;
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}
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break;
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case MEMBUF:
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case VIDBUF8:
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case VIDBUF16:
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case VIDBUF24:
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case VIDBUF32:
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address = dst->Bitmap + (dst->VXsize * y + x) * dst->PixelBytes;
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bcopy(line, address, width * dst->PixelBytes);
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break;
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default:
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;
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}
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}
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static void
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ReadVerticalLine(VGLBitmap *src, int x, int y, int width, byte *line)
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{
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int i, bit, pos, count, planepos, start_offset, end_offset, offset;
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int width2, len;
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byte *address;
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byte *VGLPlane[4];
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switch (src->Type) {
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case VIDBUF4S:
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start_offset = (x & 0x07);
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end_offset = (x + width) & 0x07;
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count = (width + start_offset) / 8;
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if (end_offset)
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count++;
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VGLPlane[0] = VGLBuf;
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VGLPlane[1] = VGLPlane[0] + count;
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VGLPlane[2] = VGLPlane[1] + count;
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VGLPlane[3] = VGLPlane[2] + count;
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for (i=0; i<4; i++) {
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outb(0x3ce, 0x04);
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outb(0x3cf, i);
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pos = VGLAdpInfo.va_line_width*y + x/8;
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for (width2 = count; width2 > 0; ) {
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offset = VGLSetSegment(pos);
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len = min(VGLAdpInfo.va_window_size - offset, width2);
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bcopy(src->Bitmap + offset, &VGLPlane[i][count - width2], len);
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pos += len;
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width2 -= len;
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}
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}
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goto read_planar;
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case VIDBUF4:
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address = src->Bitmap + VGLAdpInfo.va_line_width * y + x/8;
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start_offset = (x & 0x07);
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end_offset = (x + width) & 0x07;
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count = (width + start_offset) / 8;
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if (end_offset)
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count++;
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VGLPlane[0] = VGLBuf;
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VGLPlane[1] = VGLPlane[0] + count;
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VGLPlane[2] = VGLPlane[1] + count;
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VGLPlane[3] = VGLPlane[2] + count;
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for (i=0; i<4; i++) {
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outb(0x3ce, 0x04);
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outb(0x3cf, i);
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bcopy(address, &VGLPlane[i][0], count);
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}
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read_planar:
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pos = 0;
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planepos = 0;
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bit = 7 - start_offset;
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while (pos < width) {
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for (; bit >= 0 && pos < width; bit--, pos++) {
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line[pos] = (VGLPlane[0][planepos] & (1<<bit) ? 1 : 0) |
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((VGLPlane[1][planepos] & (1<<bit) ? 1 : 0) << 1) |
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((VGLPlane[2][planepos] & (1<<bit) ? 1 : 0) << 2) |
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((VGLPlane[3][planepos] & (1<<bit) ? 1 : 0) << 3);
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}
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planepos++;
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bit = 7;
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}
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break;
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case VIDBUF8X:
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address = src->Bitmap + VGLAdpInfo.va_line_width * y + x/4;
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for (i=0; i<4; i++) {
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outb(0x3ce, 0x04);
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outb(0x3cf, (x + i)%4);
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for (planepos=0, pos=i; pos<width; planepos++, pos+=4)
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line[pos] = address[planepos];
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if ((x + i)%4 == 3)
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++address;
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}
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break;
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case VIDBUF8S:
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case VIDBUF16S:
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case VIDBUF24S:
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case VIDBUF32S:
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width = width * src->PixelBytes;
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pos = (src->VXsize * y + x) * src->PixelBytes;
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while (width > 0) {
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offset = VGLSetSegment(pos);
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i = min(VGLAdpInfo.va_window_size - offset, width);
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bcopy(src->Bitmap + offset, line, i);
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line += i;
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pos += i;
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width -= i;
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}
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break;
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case MEMBUF:
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case VIDBUF8:
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case VIDBUF16:
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case VIDBUF24:
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case VIDBUF32:
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address = src->Bitmap + (src->VXsize * y + x) * src->PixelBytes;
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bcopy(address, line, width * src->PixelBytes);
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break;
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default:
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;
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}
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}
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int
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__VGLBitmapCopy(VGLBitmap *src, int srcx, int srcy,
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VGLBitmap *dst, int dstx, int dsty, int width, int hight)
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{
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int srcline, dstline, yend, yextra, ystep;
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if (srcx>src->VXsize || srcy>src->VYsize
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|| dstx>dst->VXsize || dsty>dst->VYsize)
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return -1;
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if (srcx < 0) {
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width=width+srcx; dstx-=srcx; srcx=0;
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}
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if (srcy < 0) {
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hight=hight+srcy; dsty-=srcy; srcy=0;
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}
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if (dstx < 0) {
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width=width+dstx; srcx-=dstx; dstx=0;
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}
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if (dsty < 0) {
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hight=hight+dsty; srcy-=dsty; dsty=0;
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}
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if (srcx+width > src->VXsize)
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width=src->VXsize-srcx;
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if (srcy+hight > src->VYsize)
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hight=src->VYsize-srcy;
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if (dstx+width > dst->VXsize)
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width=dst->VXsize-dstx;
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if (dsty+hight > dst->VYsize)
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hight=dst->VYsize-dsty;
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if (width < 0 || hight < 0)
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return -1;
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yend = srcy + hight;
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yextra = 0;
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ystep = 1;
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if (src->Bitmap == dst->Bitmap && srcy < dsty) {
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yend = srcy;
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yextra = hight - 1;
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ystep = -1;
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}
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if (src->Type == MEMBUF) {
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for (srcline = srcy + yextra, dstline = dsty + yextra; srcline != yend;
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srcline += ystep, dstline += ystep) {
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WriteVerticalLine(dst, dstx, dstline, width,
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src->Bitmap+(srcline*src->VXsize+srcx)*dst->PixelBytes);
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}
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}
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else if (dst->Type == MEMBUF) {
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for (srcline=srcy, dstline=dsty; srcline<srcy+hight; srcline++, dstline++) {
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ReadVerticalLine(src, srcx, srcline, width,
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dst->Bitmap+(dstline*dst->VXsize+dstx)*src->PixelBytes);
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}
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}
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else {
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byte buffer[2048]; /* XXX */
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byte *p;
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if (width * src->PixelBytes > sizeof(buffer)) {
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p = malloc(width * src->PixelBytes);
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if (p == NULL)
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return 1;
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} else {
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p = buffer;
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}
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for (srcline = srcy + yextra, dstline = dsty + yextra; srcline != yend;
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srcline += ystep, dstline += ystep) {
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ReadVerticalLine(src, srcx, srcline, width, p);
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WriteVerticalLine(dst, dstx, dstline, width, p);
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}
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if (width * src->PixelBytes > sizeof(buffer))
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free(p);
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}
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return 0;
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}
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int
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VGLBitmapCopy(VGLBitmap *src, int srcx, int srcy,
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VGLBitmap *dst, int dstx, int dsty, int width, int hight)
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{
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int error;
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if (src->Type != MEMBUF)
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VGLMouseFreeze(srcx, srcy, width, hight, 0);
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if (dst->Type != MEMBUF)
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VGLMouseFreeze(dstx, dsty, width, hight, 0);
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error = __VGLBitmapCopy(src, srcx, srcy, dst, dstx, dsty, width, hight);
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if (src->Type != MEMBUF || dst->Type != MEMBUF)
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VGLMouseUnFreeze();
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return error;
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}
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VGLBitmap
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*VGLBitmapCreate(int type, int xsize, int ysize, byte *bits)
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{
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VGLBitmap *object;
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if (type != MEMBUF)
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return NULL;
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if (xsize < 0 || ysize < 0)
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return NULL;
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object = (VGLBitmap *)malloc(sizeof(*object));
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if (object == NULL)
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return NULL;
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object->Type = type;
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object->Xsize = xsize;
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object->Ysize = ysize;
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object->VXsize = xsize;
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object->VYsize = ysize;
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object->Xorigin = 0;
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object->Yorigin = 0;
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object->Bitmap = bits;
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object->PixelBytes = VGLDisplay->PixelBytes;
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return object;
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}
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void
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VGLBitmapDestroy(VGLBitmap *object)
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{
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if (object->Bitmap)
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free(object->Bitmap);
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free(object);
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}
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int
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VGLBitmapAllocateBits(VGLBitmap *object)
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{
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object->Bitmap = malloc(object->VXsize*object->VYsize*object->PixelBytes);
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if (object->Bitmap == NULL)
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return -1;
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return 0;
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}
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