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* Copyright (C) 2001,2002 Constantin Kaplinsky. All Rights Reserved.
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* cursor.c - code to support cursor shape updates (XCursor and
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* RichCursor preudo-encodings).
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#include <demoviewer.h>
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#define OPER_RESTORE 1
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#define RGB24_TO_PIXEL(bpp,r,g,b) \
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((((CARD##bpp)(r) & 0xFF) * myFormat.redMax + 127) / 255 \
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<< myFormat.redShift | \
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(((CARD##bpp)(g) & 0xFF) * myFormat.greenMax + 127) / 255 \
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<< myFormat.greenShift | \
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(((CARD##bpp)(b) & 0xFF) * myFormat.blueMax + 127) / 255 \
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<< myFormat.blueShift)
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static Bool prevSoftCursorSet = False;
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static Pixmap rcSavedArea;
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static CARD8 *rcSource, *rcMask;
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static int rcHotX, rcHotY, rcWidth, rcHeight;
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static int rcCursorX = 0, rcCursorY = 0;
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static int rcLockX, rcLockY, rcLockWidth, rcLockHeight;
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static Bool rcCursorHidden, rcLockSet;
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static Bool SoftCursorInLockedArea(void);
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static void SoftCursorCopyArea(int oper);
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static void SoftCursorDraw(void);
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static void FreeSoftCursor(void);
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static void FreeX11Cursor();
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/* Copied from Xvnc/lib/font/util/utilbitmap.c */
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static unsigned char _reverse_byte[0x100] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
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/* Data kept for HandleXCursor() function. */
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static Bool prevXCursorSet = False;
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static Cursor prevXCursor;
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Bool HandleXCursor(int xhot, int yhot, int width, int height)
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rfbXCursorColors colors;
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size_t bytesPerRow, bytesData;
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unsigned int wret = 0, hret = 0;
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bytesPerRow = (width + 7) / 8;
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bytesData = bytesPerRow * height;
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dr = DefaultRootWindow(dpy);
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if (width * height) {
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if (!ReadFromRFBServer((char *)&colors, sz_rfbXCursorColors))
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buf = malloc(bytesData * 2);
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if (!ReadFromRFBServer(buf, bytesData * 2)) {
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XQueryBestCursor(dpy, dr, width, height, &wret, &hret);
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if (width * height == 0 || wret < width || hret < height) {
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bg.red = (unsigned short)colors.backRed << 8 | colors.backRed;
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bg.green = (unsigned short)colors.backGreen << 8 | colors.backGreen;
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bg.blue = (unsigned short)colors.backBlue << 8 | colors.backBlue;
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fg.red = (unsigned short)colors.foreRed << 8 | colors.foreRed;
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fg.green = (unsigned short)colors.foreGreen << 8 | colors.foreGreen;
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fg.blue = (unsigned short)colors.foreBlue << 8 | colors.foreBlue;
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for (i = 0; i < bytesData * 2; i++)
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buf[i] = (char)_reverse_byte[(int)buf[i] & 0xFF];
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source = XCreateBitmapFromData(dpy, dr, buf, width, height);
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mask = XCreateBitmapFromData(dpy, dr, &buf[bytesData], width, height);
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cursor = XCreatePixmapCursor(dpy, source, mask, &fg, &bg, xhot, yhot);
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XFreePixmap(dpy, source);
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XFreePixmap(dpy, mask);
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XDefineCursor(dpy, desktopWin, cursor);
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prevXCursor = cursor;
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prevXCursorSet = True;
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/*********************************************************************
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* HandleCursorShape(). Support for XCursor and RichCursor shape
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* updates. We emulate cursor operating on the frame buffer (that is
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* why we call it "software cursor").
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********************************************************************/
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Bool HandleCursorShape(int xhot, int yhot, int width, int height, CARD32 enc)
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size_t bytesPerRow, bytesMaskData;
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rfbXCursorColors rgb;
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bytesPerPixel = myFormat.bitsPerPixel / 8;
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bytesPerRow = (width + 7) / 8;
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bytesMaskData = bytesPerRow * height;
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dr = DefaultRootWindow(dpy);
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if (width * height == 0)
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/* Allocate memory for pixel data and temporary mask data. */
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rcSource = malloc(width * height * bytesPerPixel);
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if (rcSource == NULL)
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buf = malloc(bytesMaskData);
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/* Read and decode cursor pixel data, depending on the encoding type. */
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if (enc == rfbEncodingXCursor) {
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if (appData.useX11Cursor) {
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HandleXCursor(xhot, yhot, width, height);
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/* Read and convert background and foreground colors. */
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if (!ReadFromRFBServer((char *)&rgb, sz_rfbXCursorColors)) {
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colors[0] = RGB24_TO_PIXEL(32, rgb.backRed, rgb.backGreen, rgb.backBlue);
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colors[1] = RGB24_TO_PIXEL(32, rgb.foreRed, rgb.foreGreen, rgb.foreBlue);
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/* Read 1bpp pixel data into a temporary buffer. */
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if (!ReadFromRFBServer(buf, bytesMaskData)) {
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/* Convert 1bpp data to byte-wide color indices. */
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for (y = 0; y < height; y++) {
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for (x = 0; x < width / 8; x++) {
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for (b = 7; b >= 0; b--) {
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*ptr = buf[y * bytesPerRow + x] >> b & 1;
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ptr += bytesPerPixel;
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for (b = 7; b > 7 - width % 8; b--) {
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*ptr = buf[y * bytesPerRow + x] >> b & 1;
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ptr += bytesPerPixel;
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/* Convert indices into the actual pixel values. */
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switch (bytesPerPixel) {
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for (x = 0; x < width * height; x++)
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rcSource[x] = (CARD8)colors[rcSource[x]];
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for (x = 0; x < width * height; x++)
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((CARD16 *)rcSource)[x] = (CARD16)colors[rcSource[x * 2]];
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for (x = 0; x < width * height; x++)
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((CARD32 *)rcSource)[x] = colors[rcSource[x * 4]];
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} else { /* enc == rfbEncodingRichCursor */
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if (!ReadFromRFBServer((char *)rcSource, width * height * bytesPerPixel)) {
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/* Read and decode mask data. */
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if (!ReadFromRFBServer(buf, bytesMaskData)) {
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rcMask = malloc(width * height);
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if (rcMask == NULL) {
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for (y = 0; y < height; y++) {
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for (x = 0; x < width / 8; x++) {
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for (b = 7; b >= 0; b--) {
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*ptr++ = buf[y * bytesPerRow + x] >> b & 1;
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for (b = 7; b > 7 - width % 8; b--) {
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*ptr++ = buf[y * bytesPerRow + x] >> b & 1;
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/* Set remaining data associated with cursor. */
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dr = DefaultRootWindow(dpy);
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rcSavedArea = XCreatePixmap(dpy, dr, width, height, visdepth);
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SoftCursorCopyArea(OPER_SAVE);
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rcCursorHidden = False;
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prevSoftCursorSet = True;
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/*********************************************************************
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* HandleCursorPos(). Support for the PointerPos pseudo-encoding used
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* to transmit changes in pointer position from server to clients.
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* PointerPos encoding is used together with cursor shape updates.
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********************************************************************/
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Bool HandleCursorPos(int x, int y)
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if (appData.useX11Cursor) {
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if (appData.fullScreen)
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XWarpPointer(dpy, None, desktopWin, 0, 0, 0, 0, x, y);
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if (x >= si.framebufferWidth)
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x = si.framebufferWidth - 1;
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if (y >= si.framebufferHeight)
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y = si.framebufferHeight - 1;
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SoftCursorMove(x, y);
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/*********************************************************************
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* SoftCursorLockArea(). This function should be used to prevent
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* collisions between simultaneous framebuffer update operations and
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* cursor drawing operations caused by movements of pointing device.
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* The parameters denote a rectangle where mouse cursor should not be
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* drawn. Every next call to this function expands locked area so
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* previous locks remain active.
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********************************************************************/
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void SoftCursorLockArea(int x, int y, int w, int h)
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if (!prevSoftCursorSet)
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newX = (x < rcLockX) ? x : rcLockX;
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newY = (y < rcLockY) ? y : rcLockY;
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rcLockWidth = (x + w > rcLockX + rcLockWidth) ?
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(x + w - newX) : (rcLockX + rcLockWidth - newX);
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rcLockHeight = (y + h > rcLockY + rcLockHeight) ?
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(y + h - newY) : (rcLockY + rcLockHeight - newY);
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if (!rcCursorHidden && SoftCursorInLockedArea()) {
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SoftCursorCopyArea(OPER_RESTORE);
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rcCursorHidden = True;
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/*********************************************************************
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* SoftCursorUnlockScreen(). This function discards all locks
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* performed since previous SoftCursorUnlockScreen() call.
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********************************************************************/
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void SoftCursorUnlockScreen(void)
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if (!prevSoftCursorSet)
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if (rcCursorHidden) {
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SoftCursorCopyArea(OPER_SAVE);
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rcCursorHidden = False;
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/*********************************************************************
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* SoftCursorMove(). Moves soft cursor into a particular location.
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* This function respects locking of screen areas so when the cursor
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* is moved into the locked area, it becomes invisible until
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* SoftCursorUnlock() functions is called.
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********************************************************************/
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void SoftCursorMove(int x, int y)
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if (prevSoftCursorSet && !rcCursorHidden) {
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SoftCursorCopyArea(OPER_RESTORE);
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rcCursorHidden = True;
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if (prevSoftCursorSet && !(rcLockSet && SoftCursorInLockedArea())) {
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SoftCursorCopyArea(OPER_SAVE);
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rcCursorHidden = False;
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/*********************************************************************
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* Internal (static) low-level functions.
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********************************************************************/
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static Bool SoftCursorInLockedArea(void)
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return (rcLockX < rcCursorX - rcHotX + rcWidth &&
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rcLockY < rcCursorY - rcHotY + rcHeight &&
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rcLockX + rcLockWidth > rcCursorX - rcHotX &&
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rcLockY + rcLockHeight > rcCursorY - rcHotY);
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static void SoftCursorCopyArea(int oper)
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x = rcCursorX - rcHotX;
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y = rcCursorY - rcHotY;
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if (x >= si.framebufferWidth || y >= si.framebufferHeight)
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} else if (x + w > si.framebufferWidth) {
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w = si.framebufferWidth - x;
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} else if (y + h > si.framebufferHeight) {
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h = si.framebufferHeight - y;
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if (oper == OPER_SAVE) {
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/* Save screen area in memory. */
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XCopyArea(dpy, desktopWin, rcSavedArea, gc, x, y, w, h, 0, 0);
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/* Restore screen area. */
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XCopyArea(dpy, rcSavedArea, desktopWin, gc, 0, 0, w, h, x, y);
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static void SoftCursorDraw(void)
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int offset, bytesPerPixel;
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bytesPerPixel = myFormat.bitsPerPixel / 8;
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/* FIXME: Speed optimization is possible. */
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for (y = 0; y < rcHeight; y++) {
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y0 = rcCursorY - rcHotY + y;
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if (y0 >= 0 && y0 < si.framebufferHeight) {
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for (x = 0; x < rcWidth; x++) {
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x0 = rcCursorX - rcHotX + x;
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if (x0 >= 0 && x0 < si.framebufferWidth) {
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offset = y * rcWidth + x;
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if (rcMask[offset]) {
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pos = (char *)&rcSource[offset * bytesPerPixel];
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CopyDataToScreen(pos, x0, y0, 1, 1);
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static void FreeSoftCursor(void)
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if (prevSoftCursorSet) {
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SoftCursorCopyArea(OPER_RESTORE);
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XFreePixmap(dpy, rcSavedArea);
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prevSoftCursorSet = False;
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static void FreeX11Cursor()
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if (prevXCursorSet) {
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XFreeCursor(dpy, prevXCursor);
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prevXCursorSet = False;
added
removed
client/demoviewer/cursor.c
