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/*
* Copyright (C) 2001,2002 Constantin Kaplinsky. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/*
* cursor.c - code to support cursor shape updates (XCursor and
* RichCursor preudo-encodings).
*/
static const char *ID = "$Id: cursor.c,v 1.5 2004/09/09 00:22:33 grmcdorman Exp $";
#include <vncsnapshot.h>
#define OPER_SAVE 0
#define OPER_RESTORE 1
#define RGB24_TO_PIXEL(bpp,r,g,b) \
((((CARD##bpp)(r) & 0xFF) * myFormat.redMax + 127) / 255 \
<< myFormat.redShift | \
(((CARD##bpp)(g) & 0xFF) * myFormat.greenMax + 127) / 255 \
<< myFormat.greenShift | \
(((CARD##bpp)(b) & 0xFF) * myFormat.blueMax + 127) / 255 \
<< myFormat.blueShift)
static Bool prevSoftCursorSet = False;
/*static Pixmap rcSavedArea;*/
static char *rcSavedArea;
static CARD8 *rcSource, *rcMask;
static int rcHotX, rcHotY, rcWidth, rcHeight;
static int rcCursorX = 0, rcCursorY = 0;
static int rcLockX, rcLockY, rcLockWidth, rcLockHeight;
static Bool rcCursorHidden, rcLockSet;
static Bool SoftCursorInLockedArea(void);
static void SoftCursorCopyArea(int oper);
static void SoftCursorDraw(void);
static void FreeSoftCursor(void);
/*********************************************************************
* HandleCursorShape(). Support for XCursor and RichCursor shape
* updates. We emulate cursor operating on the frame buffer (that is
* why we call it "software cursor").
********************************************************************/
Bool HandleCursorShape(int xhot, int yhot, int width, int height, CARD32 enc)
{
int bytesPerPixel;
size_t bytesPerRow, bytesMaskData;
/* Drawable dr;*/
rfbXCursorColors rgb;
CARD32 colors[2];
char *buf;
CARD8 *ptr;
int x, y, b;
bytesPerPixel = myFormat.bitsPerPixel / 8;
bytesPerRow = (width + 7) / 8;
bytesMaskData = bytesPerRow * height;
/* dr = DefaultRootWindow(dpy);*/
FreeSoftCursor();
if (width * height == 0)
return True;
/* Allocate memory for pixel data and temporary mask data. */
rcSource = malloc(width * height * bytesPerPixel);
if (rcSource == NULL)
return False;
buf = malloc(bytesMaskData);
if (buf == NULL) {
free(rcSource);
return False;
}
/* Read and decode cursor pixel data, depending on the encoding type. */
if (enc == rfbEncodingXCursor) {
/* Read and convert background and foreground colors. */
if (!ReadFromRFBServer((char *)&rgb, sz_rfbXCursorColors)) {
free(rcSource);
free(buf);
return False;
}
colors[0] = RGB24_TO_PIXEL(32, rgb.backRed, rgb.backGreen, rgb.backBlue);
colors[1] = RGB24_TO_PIXEL(32, rgb.foreRed, rgb.foreGreen, rgb.foreBlue);
/* Read 1bpp pixel data into a temporary buffer. */
if (!ReadFromRFBServer(buf, bytesMaskData)) {
free(rcSource);
free(buf);
return False;
}
/* Convert 1bpp data to byte-wide color indices. */
ptr = rcSource;
for (y = 0; y < height; y++) {
for (x = 0; x < width / 8; x++) {
for (b = 7; b >= 0; b--) {
*ptr = buf[y * bytesPerRow + x] >> b & 1;
ptr += bytesPerPixel;
}
}
for (b = 7; b > 7 - width % 8; b--) {
*ptr = buf[y * bytesPerRow + x] >> b & 1;
ptr += bytesPerPixel;
}
}
/* Convert indices into the actual pixel values. */
switch (bytesPerPixel) {
case 1:
for (x = 0; x < width * height; x++)
rcSource[x] = (CARD8)colors[rcSource[x]];
break;
case 2:
for (x = 0; x < width * height; x++)
((CARD16 *)rcSource)[x] = (CARD16)colors[rcSource[x * 2]];
break;
case 4:
for (x = 0; x < width * height; x++)
((CARD32 *)rcSource)[x] = colors[rcSource[x * 4]];
break;
}
} else { /* enc == rfbEncodingRichCursor */
if (!ReadFromRFBServer((char *)rcSource, width * height * bytesPerPixel)) {
free(rcSource);
free(buf);
return False;
}
}
/* Read and decode mask data. */
if (!ReadFromRFBServer(buf, bytesMaskData)) {
free(rcSource);
free(buf);
return False;
}
rcMask = malloc(width * height);
if (rcMask == NULL) {
free(rcSource);
free(buf);
return False;
}
ptr = rcMask;
for (y = 0; y < height; y++) {
for (x = 0; x < width / 8; x++) {
for (b = 7; b >= 0; b--) {
*ptr++ = buf[y * bytesPerRow + x] >> b & 1;
}
}
for (b = 7; b > 7 - width % 8; b--) {
*ptr++ = buf[y * bytesPerRow + x] >> b & 1;
}
}
free(buf);
/* Set remaining data associated with cursor. */
/* dr = DefaultRootWindow(dpy);
rcSavedArea = XCreatePixmap(dpy, dr, width, height, visdepth);*/
rcHotX = xhot;
rcHotY = yhot;
rcWidth = width;
rcHeight = height;
/* Do not draw. Only draw when we have the position. */
SoftCursorCopyArea(OPER_SAVE);
/*SoftCursorDraw();*/
rcCursorHidden = False;
rcLockSet = False;
prevSoftCursorSet = True;
return True;
}
/*********************************************************************
* HandleCursorPos(). Support for the PointerPos pseudo-encoding used
* to transmit changes in pointer position from server to clients.
* PointerPos encoding is used together with cursor shape updates.
********************************************************************/
Bool HandleCursorPos(int x, int y)
{
if (x >= si.framebufferWidth)
x = si.framebufferWidth - 1;
if (y >= si.framebufferHeight)
y = si.framebufferHeight - 1;
SoftCursorMove(x, y);
return True;
}
/*********************************************************************
* SoftCursorLockArea(). This function should be used to prevent
* collisions between simultaneous framebuffer update operations and
* cursor drawing operations caused by movements of pointing device.
* The parameters denote a rectangle where mouse cursor should not be
* drawn. Every next call to this function expands locked area so
* previous locks remain active.
********************************************************************/
void SoftCursorLockArea(int x, int y, int w, int h)
{
int newX, newY;
if (!BufferWritten()) {
return; /* no cursor to hide */
}
if (!prevSoftCursorSet)
return;
if (!rcLockSet) {
rcLockX = x;
rcLockY = y;
rcLockWidth = w;
rcLockHeight = h;
rcLockSet = True;
} else {
newX = (x < rcLockX) ? x : rcLockX;
newY = (y < rcLockY) ? y : rcLockY;
rcLockWidth = (x + w > rcLockX + rcLockWidth) ?
(x + w - newX) : (rcLockX + rcLockWidth - newX);
rcLockHeight = (y + h > rcLockY + rcLockHeight) ?
(y + h - newY) : (rcLockY + rcLockHeight - newY);
rcLockX = newX;
rcLockY = newY;
}
if (!rcCursorHidden && SoftCursorInLockedArea()) {
SoftCursorCopyArea(OPER_RESTORE);
rcCursorHidden = True;
}
}
/*********************************************************************
* SoftCursorUnlockScreen(). This function discards all locks
* performed since previous SoftCursorUnlockScreen() call.
********************************************************************/
void SoftCursorUnlockScreen(void)
{
if (!prevSoftCursorSet)
return;
if (rcCursorHidden) {
SoftCursorCopyArea(OPER_SAVE);
if (appData.useRemoteCursor == 1) {
SoftCursorDraw();
}
rcCursorHidden = False;
}
rcLockSet = False;
}
/*********************************************************************
* SoftCursorMove(). Moves soft cursor into a particular location.
* This function respects locking of screen areas so when the cursor
* is moved into the locked area, it becomes invisible until
* SoftCursorUnlock() functions is called.
********************************************************************/
void SoftCursorMove(int x, int y)
{
if (prevSoftCursorSet && !rcCursorHidden) {
SoftCursorCopyArea(OPER_RESTORE);
rcCursorHidden = True;
}
rcCursorX = x;
rcCursorY = y;
if (prevSoftCursorSet && !(rcLockSet && SoftCursorInLockedArea())) {
SoftCursorCopyArea(OPER_SAVE);
if (appData.useRemoteCursor == 1) {
SoftCursorDraw();
}
rcCursorHidden = False;
}
}
/*********************************************************************
* Internal (static) low-level functions.
********************************************************************/
static Bool SoftCursorInLockedArea(void)
{
return (rcLockX < rcCursorX - rcHotX + rcWidth &&
rcLockY < rcCursorY - rcHotY + rcHeight &&
rcLockX + rcLockWidth > rcCursorX - rcHotX &&
rcLockY + rcLockHeight > rcCursorY - rcHotY);
}
static void SoftCursorCopyArea(int oper)
{
int x, y, w, h;
x = rcCursorX - rcHotX;
y = rcCursorY - rcHotY;
if (x >= si.framebufferWidth || y >= si.framebufferHeight)
return;
w = rcWidth;
h = rcHeight;
if (x < 0) {
w += x;
x = 0;
} else if (x + w > si.framebufferWidth) {
w = si.framebufferWidth - x;
}
if (y < 0) {
h += y;
y = 0;
} else if (y + h > si.framebufferHeight) {
h = si.framebufferHeight - y;
}
if (oper == OPER_SAVE) {
/* Save screen area in memory. */
if (rcSavedArea != NULL) {
free(rcSavedArea);
rcSavedArea = NULL;
}
rcSavedArea = CopyScreenToData(x, y, w, h);
} else {
/* Restore screen area. */
CopyDataToScreen(rcSavedArea, x, y, w, h);
}
}
static void SoftCursorDraw(void)
{
int x, y, x0, y0;
int offset, bytesPerPixel;
char *pos;
bytesPerPixel = myFormat.bitsPerPixel / 8;
/* FIXME: Speed optimization is possible. */
for (y = 0; y < rcHeight; y++) {
y0 = rcCursorY - rcHotY + y;
if (y0 >= 0 && y0 < si.framebufferHeight) {
for (x = 0; x < rcWidth; x++) {
x0 = rcCursorX - rcHotX + x;
if (x0 >= 0 && x0 < si.framebufferWidth) {
offset = y * rcWidth + x;
if (rcMask[offset]) {
pos = (char *)&rcSource[offset * bytesPerPixel];
CopyDataToScreen(pos, x0, y0, 1, 1);
}
}
}
}
}
}
static void FreeSoftCursor(void)
{
if (prevSoftCursorSet) {
SoftCursorCopyArea(OPER_RESTORE);
if (rcSavedArea != NULL) {
free(rcSavedArea);
rcSavedArea = NULL;
}
free(rcSource);
free(rcMask);
prevSoftCursorSet = False;
}
}
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