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freebsd-dev/lib/libvgl/mouse.c
Bruce Evans fbc6daa1dc Fix buffer overruns in modes with color depth more than 8. 
Support for 16-bit and 32-bit Truecolor modes was supposed to be
complete in r70991 of main.c and in nearby revisions for other files, but
it was broken by the overruns in most cases (all cases were the mouse
is enabled, and most cases where bitmaps are used).  r70991 also
uninintentionally added support for depths 9-15, 17-23 and 25-31.
Depth 24 was more obviously broken and its support is ifdefed out.  In
the other ranges, only depth 15 is common.  It was broken by buffer
overruns in all cases.

bitmap.c:
- the static buffer was used even when it was too small (but it was
  large enough to often work accidentally in depth 16)
- the size of the dynamically allocated buffer was too small
- the sizing info bitmap->PixelBytes was not inititialzed in the bitmap
  constructor.  It often ended up as 0 for MEMBUFs, so using it in more
  places gave more null pointer accesses.  (It is per-bitmap, but since
  conversion between bitmaps of different depths is not supported (except
  from 4 bits by padding to 8), it would work better if it were global.)

main.c:
- depths were rounded down instead of up to a multiple of 8, so PixelBytes
  was 1 too small for depths above 8 except 16, 24 and 32.
- PixelBytes was not initialized for 4-bit planar modes.  It isn't really
  used for frame buffer accesses in these modes, but needs to be 1 in
  MEMBUF images.

mouse.c:
- the mouse cursor buffers were too small.

vgl.h:
- PixelBytes was not initialized in the static bitmap constructor.  It
  should be initialized to the value for the current mode, but that is
  impossible in a static constructor.  Initialize it to -1 so as to
  fail if it is used without further initialization.

All modes that are supposed to be supported now don't crash in
nontrivial tests, and almost work.  Missing uses of PixelBytes now
give in-bounds wrong pointers instead of overruns.  Misconversions of
bitmaps give multiple miscolored mouse cursors instead of 1 white one,
and similarly for bitmaps copied through a MEMBUF.
2019-03-24 18:57:03 +00:00

288 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1991-1997 Søren Schmidt
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/consio.h>
#include <sys/fbio.h>
#include "vgl.h"
#define X 0xff
static byte StdAndMask[MOUSE_IMG_SIZE*MOUSE_IMG_SIZE] = {
X,X,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
X,X,X,0,0,0,0,0,0,0,0,0,0,0,0,0,
X,X,X,X,0,0,0,0,0,0,0,0,0,0,0,0,
X,X,X,X,X,0,0,0,0,0,0,0,0,0,0,0,
X,X,X,X,X,X,0,0,0,0,0,0,0,0,0,0,
X,X,X,X,X,X,X,0,0,0,0,0,0,0,0,0,
X,X,X,X,X,X,X,X,0,0,0,0,0,0,0,0,
X,X,X,X,X,X,X,X,X,0,0,0,0,0,0,0,
X,X,X,X,X,X,X,0,0,0,0,0,0,0,0,0,
0,0,0,X,X,X,X,0,0,0,0,0,0,0,0,0,
0,0,0,X,X,X,X,X,0,0,0,0,0,0,0,0,
0,0,0,0,X,X,X,X,0,0,0,0,0,0,0,0,
0,0,0,0,X,X,X,X,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
static byte StdOrMask[MOUSE_IMG_SIZE*MOUSE_IMG_SIZE] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,X,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,X,X,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,X,X,X,0,0,0,0,0,0,0,0,0,0,0,0,
0,X,X,X,X,0,0,0,0,0,0,0,0,0,0,0,
0,X,X,X,X,X,0,0,0,0,0,0,0,0,0,0,
0,X,X,X,X,X,X,0,0,0,0,0,0,0,0,0,
0,X,X,0,X,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,X,X,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,X,X,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,X,X,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,X,X,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
#undef X
static VGLBitmap VGLMouseStdAndMask =
VGLBITMAP_INITIALIZER(MEMBUF, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE, StdAndMask);
static VGLBitmap VGLMouseStdOrMask =
VGLBITMAP_INITIALIZER(MEMBUF, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE, StdOrMask);
static VGLBitmap *VGLMouseAndMask, *VGLMouseOrMask;
static byte map[MOUSE_IMG_SIZE*MOUSE_IMG_SIZE*4];
static VGLBitmap VGLMouseSave =
VGLBITMAP_INITIALIZER(MEMBUF, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE, map);
static int VGLMouseVisible = 0;
static int VGLMouseFrozen = 0;
static int VGLMouseShown = 0;
static int VGLMouseXpos = 0;
static int VGLMouseYpos = 0;
static int VGLMouseButtons = 0;
void
VGLMousePointerShow()
{
byte buf[MOUSE_IMG_SIZE*MOUSE_IMG_SIZE*4];
VGLBitmap buffer =
VGLBITMAP_INITIALIZER(MEMBUF, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE, buf);
byte crtcidx, crtcval, gdcidx, gdcval;
int pos;
if (!VGLMouseVisible) {
VGLMouseVisible = 1;
crtcidx = inb(0x3c4);
crtcval = inb(0x3c5);
gdcidx = inb(0x3ce);
gdcval = inb(0x3cf);
__VGLBitmapCopy(VGLDisplay, VGLMouseXpos, VGLMouseYpos,
&VGLMouseSave, 0, 0, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE);
bcopy(VGLMouseSave.Bitmap, buffer.Bitmap, MOUSE_IMG_SIZE*MOUSE_IMG_SIZE);
for (pos = 0; pos < MOUSE_IMG_SIZE*MOUSE_IMG_SIZE; pos++)
buffer.Bitmap[pos]=(buffer.Bitmap[pos]&~(VGLMouseAndMask->Bitmap[pos])) |
VGLMouseOrMask->Bitmap[pos];
__VGLBitmapCopy(&buffer, 0, 0, VGLDisplay,
VGLMouseXpos, VGLMouseYpos, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE);
outb(0x3c4, crtcidx);
outb(0x3c5, crtcval);
outb(0x3ce, gdcidx);
outb(0x3cf, gdcval);
}
}
void
VGLMousePointerHide()
{
byte crtcidx, crtcval, gdcidx, gdcval;
if (VGLMouseVisible) {
VGLMouseVisible = 0;
crtcidx = inb(0x3c4);
crtcval = inb(0x3c5);
gdcidx = inb(0x3ce);
gdcval = inb(0x3cf);
__VGLBitmapCopy(&VGLMouseSave, 0, 0, VGLDisplay,
VGLMouseXpos, VGLMouseYpos, MOUSE_IMG_SIZE, MOUSE_IMG_SIZE);
outb(0x3c4, crtcidx);
outb(0x3c5, crtcval);
outb(0x3ce, gdcidx);
outb(0x3cf, gdcval);
}
}
void
VGLMouseMode(int mode)
{
if (mode == VGL_MOUSESHOW) {
if (VGLMouseShown == VGL_MOUSEHIDE) {
VGLMousePointerShow();
VGLMouseShown = VGL_MOUSESHOW;
}
}
else {
if (VGLMouseShown == VGL_MOUSESHOW) {
VGLMousePointerHide();
VGLMouseShown = VGL_MOUSEHIDE;
}
}
}
void
VGLMouseAction(int dummy)
{
struct mouse_info mouseinfo;
if (VGLMouseFrozen) {
VGLMouseFrozen++;
return;
}
mouseinfo.operation = MOUSE_GETINFO;
ioctl(0, CONS_MOUSECTL, &mouseinfo);
if (VGLMouseShown == VGL_MOUSESHOW)
VGLMousePointerHide();
VGLMouseXpos = mouseinfo.u.data.x;
VGLMouseYpos = mouseinfo.u.data.y;
VGLMouseButtons = mouseinfo.u.data.buttons;
if (VGLMouseShown == VGL_MOUSESHOW)
VGLMousePointerShow();
}
void
VGLMouseSetImage(VGLBitmap *AndMask, VGLBitmap *OrMask)
{
if (VGLMouseShown == VGL_MOUSESHOW)
VGLMousePointerHide();
VGLMouseAndMask = AndMask;
VGLMouseOrMask = OrMask;
if (VGLMouseShown == VGL_MOUSESHOW)
VGLMousePointerShow();
}
void
VGLMouseSetStdImage()
{
if (VGLMouseShown == VGL_MOUSESHOW)
VGLMousePointerHide();
VGLMouseAndMask = &VGLMouseStdAndMask;
VGLMouseOrMask = &VGLMouseStdOrMask;
if (VGLMouseShown == VGL_MOUSESHOW)
VGLMousePointerShow();
}
int
VGLMouseInit(int mode)
{
struct mouse_info mouseinfo;
int error;
VGLMouseSetStdImage();
mouseinfo.operation = MOUSE_MODE;
mouseinfo.u.mode.signal = SIGUSR2;
if ((error = ioctl(0, CONS_MOUSECTL, &mouseinfo)))
return error;
signal(SIGUSR2, VGLMouseAction);
mouseinfo.operation = MOUSE_GETINFO;
ioctl(0, CONS_MOUSECTL, &mouseinfo);
VGLMouseXpos = mouseinfo.u.data.x;
VGLMouseYpos = mouseinfo.u.data.y;
VGLMouseButtons = mouseinfo.u.data.buttons;
VGLMouseMode(mode);
return 0;
}
int
VGLMouseStatus(int *x, int *y, char *buttons)
{
signal(SIGUSR2, SIG_IGN);
*x = VGLMouseXpos;
*y = VGLMouseYpos;
*buttons = VGLMouseButtons;
signal(SIGUSR2, VGLMouseAction);
return VGLMouseShown;
}
int
VGLMouseFreeze(int x, int y, int width, int hight, byte color)
{
if (!VGLMouseFrozen) {
VGLMouseFrozen = 1;
if (width > 1 || hight > 1) { /* bitmap */
if (VGLMouseShown == 1) {
int overlap;
if (x > VGLMouseXpos)
overlap = (VGLMouseXpos + MOUSE_IMG_SIZE) - x;
else
overlap = (x + width) - VGLMouseXpos;
if (overlap > 0) {
if (y > VGLMouseYpos)
overlap = (VGLMouseYpos + MOUSE_IMG_SIZE) - y;
else
overlap = (y + hight) - VGLMouseYpos;
if (overlap > 0)
VGLMousePointerHide();
}
}
}
else { /* bit */
if (VGLMouseShown &&
x >= VGLMouseXpos && x < VGLMouseXpos + MOUSE_IMG_SIZE &&
y >= VGLMouseYpos && y < VGLMouseYpos + MOUSE_IMG_SIZE) {
VGLMouseSave.Bitmap[(y-VGLMouseYpos)*MOUSE_IMG_SIZE+(x-VGLMouseXpos)] =
(color);
if (VGLMouseAndMask->Bitmap
[(y-VGLMouseYpos)*MOUSE_IMG_SIZE+(x-VGLMouseXpos)]) {
return 1;
}
}
}
}
return 0;
}
void
VGLMouseUnFreeze()
{
if (VGLMouseFrozen > 1) {
VGLMouseFrozen = 0;
VGLMouseAction(0);
}
else {
VGLMouseFrozen = 0;
if (VGLMouseShown == VGL_MOUSESHOW && !VGLMouseVisible)
VGLMousePointerShow();
}
}
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