/ src / PScreen.cc
Commit: 52e6fc89df08184708c093e63abd1eea0d82579bAuthor: Andreas
Date: Fri Feb 26 13:41:55 +0100 2010
Subject: Correct the calculation of the number of modifiers to mask.
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PScreen.cc
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// // PScreen.cc for pekwm // Copyright © 2003-2009 Claes Nästén <me{@}pekdon{.}net> // // This program is licensed under the GNU GPL. // See the LICENSE file for more information. // #ifdef HAVE_CONFIG_H #include "config.h" #endif // HAVE_CONFIG_H #include <string> #include <iostream> #include <cassert> #ifdef HAVE_LIMITS #include <limits> using std::numeric_limits; #endif // HAVE_LIMITS extern "C" { #include <X11/Xlib.h> #ifdef HAVE_SHAPE #include <X11/Xutil.h> #include <X11/extensions/shape.h> #endif // HAVE_SHAPE #ifdef HAVE_XRANDR #include <X11/extensions/Xrandr.h> #endif // HAVE_XRANDR #include <X11/keysym.h> // For XK_ entries #include <sys/select.h> #ifdef DEBUG bool xerrors_ignore = false; #endif // DEBUG unsigned int xerrors_count = 0; } #include "PScreen.hh" // FIXME: Remove when strut handling is moved away from here. #include "PWinObj.hh" #include "ManagerWindows.hh" using std::cerr; using std::endl; using std::vector; using std::list; using std::map; using std::string; const uint PScreen::MODIFIER_TO_MASK[] = { ShiftMask, LockMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask }; const uint PScreen::MODIFIER_TO_MASK_NUM = sizeof(PScreen::MODIFIER_TO_MASK[0]) / sizeof(PScreen::MODIFIER_TO_MASK); PScreen* PScreen::_instance = 0; extern "C" { /** * XError handler, prints error. */ static int handleXError(Display *dpy, XErrorEvent *ev) { ++xerrors_count; #ifdef DEBUG if (xerrors_ignore) { return 0; } char error_buf[256]; XGetErrorText(dpy, ev->error_code, error_buf, 256); cerr << "XError: " << error_buf << " id: " << ev->resourceid << endl; #endif // DEBUG return 0; } } //! @brief PScreen::Visual constructor. //! @param x_visual X Visual to wrap. PScreen::PVisual::PVisual(Visual *x_visual) : _x_visual(x_visual), _r_shift(0), _r_prec(0), _g_shift(0), _g_prec(0), _b_shift(0), _b_prec(0) { getShiftPrecFromMask(_x_visual->red_mask, _r_shift, _r_prec); getShiftPrecFromMask(_x_visual->green_mask, _g_shift, _g_prec); getShiftPrecFromMask(_x_visual->blue_mask, _b_shift, _b_prec); } //! @brief PScreen::Visual destructor. PScreen::PVisual::~PVisual(void) { } //! @brief Gets shift and prec from mask. //! @param mask red,green,blue mask of Visual. //! @param shift Set to the shift of mask. //! @param prec Set to the prec of mask. void PScreen::PVisual::getShiftPrecFromMask(ulong mask, int &shift, int &prec) { for (shift = 0; ! (mask&0x1); ++shift) { mask >>= 1; } for (prec = 0; (mask&0x1); ++prec) { mask >>= 1; } } //! @brief PScreen constructor PScreen::PScreen(Display *dpy, bool honour_randr) : _dpy(dpy), _honour_randr(honour_randr), _fd(-1), _screen(-1), _depth(-1), _root(None), _visual(0), _colormap(None), _modifier_map(0), _num_lock(0), _scroll_lock(0), _has_extension_shape(false), _event_shape(-1), _has_extension_xinerama(false), _has_extension_xrandr(false), _event_xrandr(-1), _server_grabs(0), _last_event_time(0), _last_click_id(None) { if (_instance) { throw string("PScreen, trying to create multiple instances"); } _instance = this; XSetErrorHandler(handleXError); XGrabServer(_dpy); _fd = ConnectionNumber(dpy); _screen = DefaultScreen(_dpy); _root = RootWindow(_dpy, _screen); _depth = DefaultDepth(_dpy, _screen); _visual = new PScreen::PVisual(DefaultVisual(_dpy, _screen)); _colormap = DefaultColormap(_dpy, _screen); _modifier_map = XGetModifierMapping(_dpy); _screen_gm.width = WidthOfScreen(ScreenOfDisplay(_dpy, _screen)); _screen_gm.height = HeightOfScreen(ScreenOfDisplay(_dpy, _screen)); #ifdef HAVE_SHAPE { int dummy_error; _has_extension_shape = XShapeQueryExtension(_dpy, &_event_shape, &dummy_error); } #endif // HAVE_SHAPE #ifdef HAVE_XRANDR { int dummy_error; _has_extension_xrandr = XRRQueryExtension(_dpy, &_event_xrandr, &dummy_error); } #endif // HAVE_XRANDR // Now screen geometry has been read and extensions have been // looked for, read head information. initHeads(); // initialize array values for (uint i = 0; i < (BUTTON_NO - 1); ++i) { _last_click_time[i] = 0; } // Figure out what keys the Num and Scroll Locks are setLockKeys(); XSync(_dpy, false); XUngrabServer(_dpy); } //! @brief PScreen destructor PScreen::~PScreen(void) { delete _visual; if (_modifier_map) { XFreeModifiermap(_modifier_map); } _instance = 0; } /** * Figure out what keys the Num and Scroll Locks are */ void PScreen::setLockKeys(void) { _num_lock = getMaskFromKeycode(XKeysymToKeycode(_dpy, XK_Num_Lock)); _scroll_lock = getMaskFromKeycode(XKeysymToKeycode(_dpy, XK_Scroll_Lock)); } //! @brief Get next event using select to avoid signal blocking //! @param ev Event to fill in. //! @return true if event was fetched, else false. bool PScreen::getNextEvent(XEvent &ev) { if (XPending(_dpy) > 0) { XNextEvent(_dpy, &ev); return true; } int ret; fd_set rfds; XFlush(_dpy); FD_ZERO(&rfds); FD_SET(_fd, &rfds); ret = select(_fd + 1, &rfds, 0, 0, 0); if (ret > 0) { XNextEvent(_dpy, &ev); } return ret > 0; } //! @brief Grabs the server, counting number of grabs bool PScreen::grabServer(void) { if (_server_grabs == 0) { XGrabServer(_dpy); } ++_server_grabs; return (_server_grabs == 1); // was actually grabbed } //! @brief Ungrabs the server, counting number of grabs bool PScreen::ungrabServer(bool sync) { if (_server_grabs > 0) { --_server_grabs; if (_server_grabs == 0) { // no more grabs left if (sync) { XSync(_dpy, false); } XUngrabServer(_dpy); } } return (_server_grabs == 0); // is actually ungrabbed } //! @brief Grabs the keyboard bool PScreen::grabKeyboard(Window win) { if (XGrabKeyboard(_dpy, win, false, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) { return true; } #ifdef DEBUG cerr << __FILE__ << "@" << __LINE__ << ": " << "PScreen(" << this << ")::grabKeyboard(" << win << ")" << endl << " *** unable to grab keyboard." << endl; #endif // DEBUG return false; } //! @brief Ungrabs the keyboard bool PScreen::ungrabKeyboard(void) { XUngrabKeyboard(_dpy, CurrentTime); return true; } //! @brief Grabs the pointer bool PScreen::grabPointer(Window win, uint event_mask, Cursor cursor) { if (XGrabPointer(_dpy, win, false, event_mask, GrabModeAsync, GrabModeAsync, None, cursor, CurrentTime) == GrabSuccess) { return true; } #ifdef DEBUG cerr << __FILE__ << "@" << __LINE__ << ": " << "PScreen(" << this << ")::grabPointer(" << win << "," << event_mask << "," << cursor << ")" << endl << " *** unable to grab pointer." << endl; #endif // DEBUG return false; } //! @brief Ungrabs the pointer bool PScreen::ungrabPointer(void) { XUngrabPointer(_dpy, CurrentTime); return true; } //! @brief Refetches the root-window size. void PScreen::updateGeometry(uint width, uint height) { #ifdef HAVE_XRANDR if (! _honour_randr || ! _has_extension_xrandr) { return; } // The screen has changed geometry in some way. To handle this the // head information is read once again, the root window is re sized // and strut information is updated. initHeads(); _screen_gm.width = width; _screen_gm.height = height; PWinObj::getRootPWinObj()->resize(width, height); updateStrut(); #endif // HAVE_XRANDR } //! @brief Searches for the head closest to the coordinates x,y. //! @return The nearest head. Head numbers are indexed from 0. uint PScreen::getNearestHead(int x, int y) { if(_heads.size() > 1) { // set distance to the highest uint value #ifdef HAVE_LIMITS uint min_distance = numeric_limits<uint>::max(); #else //! HAVE_LIMITS uint min_distance = ~0; #endif // HAVE_LIMITS uint nearest_head = 0; uint distance; int head_t, head_b, head_l, head_r; for(uint head = 0; head < _heads.size(); ++head) { head_t = _heads[head].y; head_b = _heads[head].y + _heads[head].height; head_l = _heads[head].x; head_r = _heads[head].x + _heads[head].width; if(x > head_r) { if(y < head_t) { // above and right of the head distance = calcDistance(x, y, head_r, head_t); } else if(y > head_b) { // below and right of the head distance = calcDistance(x, y, head_r, head_b); } else { // right of the head distance = calcDistance(x, head_r); } } else if(x < head_l) { if(y < head_t) { // above and left of the head distance = calcDistance(x, y, head_l, head_t); } else if(y > head_b) { // below and left of the head distance = calcDistance(x, y, head_l, head_b); } else { // left of the head distance = calcDistance(x, head_l); } } else { if(y < head_t) { // above the head distance = calcDistance(y, head_t); } else if(y > head_b) { // below the head distance = calcDistance(y, head_b); } else { // on the head return head; } } #ifdef DEBUG cerr << __FILE__ << "@" << __LINE__ << ": PScreen::getNearestHead( " << x << "," << y << ") " << "head boundaries " << head_t << "," << head_b << "," << head_l << "," << head_r << " " << "distance " << distance << " min_distance " << min_distance << endl; #endif // DEBUG if(distance < min_distance) { min_distance = distance; nearest_head = head; } } return nearest_head; } else { return 0; } } //! @brief Searches for the head that the pointer currently is on. //! @return Active head number uint PScreen::getCurrHead(void) { uint head = 0; if (_heads.size() > 1) { int x = 0, y = 0; getMousePosition(x, y); head = getNearestHead(x, y); #ifdef DEBUG cerr << __FILE__ << "@" << __LINE__ << ": PScreen::getCurrHead() got head " << head << " from mouse position " << x << "," << y << endl; #endif // DEBUG } return head; } //! @brief Fills head_info with info about head nr head //! @param head Head number to examine //! @param head_info Returning info about the head //! @return true if xinerama is off or head exists. bool PScreen::getHeadInfo(uint head, Geometry &head_info) { if (head < _heads.size()) { head_info.x = _heads[head].x; head_info.y = _heads[head].y; head_info.width = _heads[head].width; head_info.height = _heads[head].height; return true; } else { #ifdef DEBUG cerr << __FILE__ << "@" << __LINE__ << ": Head: " << head << " doesn't exist!" << endl; #endif // DEBUG return false; } } /** * Same as getHeadInfo but returns Geometry instead of filling it in. */ Geometry PScreen::getHeadGeometry(uint head) { Geometry gm(_screen_gm); getHeadInfo(head, gm); return gm; } //! @brief Fill information about head and the strut. void PScreen::getHeadInfoWithEdge(uint num, Geometry &head) { if (! getHeadInfo(num, head)) { return; } int strut_val; Strut strut(_heads[num].strut); // Convenience // Remove the strut area from the head info strut_val = (head.x == 0) ? std::max(_strut.left, strut.left) : strut.left; head.x += strut_val; head.width -= strut_val; strut_val = ((head.x + head.width) == _screen_gm.width) ? std::max(_strut.right, strut.right) : strut.right; head.width -= strut_val; strut_val = (head.y == 0) ? std::max(_strut.top, strut.top) : strut.top; head.y += strut_val; head.height -= strut_val; strut_val = (head.y + head.height == _screen_gm.height) ? std::max(_strut.bottom, strut.bottom) : strut.bottom; head.height -= strut_val; } void PScreen::getMousePosition(int &x, int &y) { Window d_root, d_win; int win_x, win_y; uint mask; XQueryPointer(_dpy, _root, &d_root, &d_win, &x, &y, &win_x, &win_y, &mask); } uint PScreen::getButtonFromState(uint state) { uint button = 0; if (state&Button1Mask) button = BUTTON1; else if (state&Button2Mask) button = BUTTON2; else if (state&Button3Mask) button = BUTTON3; else if (state&Button4Mask) button = BUTTON4; else if (state&Button5Mask) button = BUTTON5; return button; } //! @brief Adds a strut to the strut list, updating max strut sizes void PScreen::addStrut(Strut *strut) { assert(strut); _strut_list.push_back(strut); updateStrut(); } //! @brief Removes a strut from the strut list void PScreen::removeStrut(Strut *strut) { assert(strut); _strut_list.remove(strut); updateStrut(); } //! @brief Updates strut max size. void PScreen::updateStrut(void) { // Reset strut data. _strut.left = 0; _strut.right = 0; _strut.top = 0; _strut.bottom = 0; for (vector<Head>::iterator it(_heads.begin()); it != _heads.end(); ++it) { it->strut.left = 0; it->strut.right = 0; it->strut.top = 0; it->strut.bottom = 0; } Strut *strut; for(list<Strut*>::iterator it(_strut_list.begin()); it != _strut_list.end(); ++it) { if ((*it)->head < 0) { strut = &_strut; } else if (static_cast<uint>((*it)->head) < _heads.size()) { strut = &(_heads[(*it)->head].strut); } else { continue; } if (strut->left < (*it)->left) { strut->left = (*it)->left; } if (strut->right < (*it)->right) { strut->right = (*it)->right; } if (strut->top < (*it)->top) { strut->top = (*it)->top; } if (strut->bottom < (*it)->bottom) { strut->bottom = (*it)->bottom; } } // Update hints on the root window Geometry workarea(_strut.left, _strut.top, _screen_gm.width - _strut.left - _strut.right, _screen_gm.height - _strut.top - _strut.bottom); static_cast<RootWO*>(PWinObj::getRootPWinObj())->setEwmhWorkarea(workarea); } //! @brief Initialize head information void PScreen::initHeads(void) { _heads.clear(); // Read head information, randr has priority over xinerama then // comes ordinary X11 information. initHeadsRandr(); if (! _heads.size()) { initHeadsXinerama(); if (! _heads.size()) { _heads.push_back(Head(0, 0, _screen_gm.width, _screen_gm.height)); } } } //! @brief Initialize head information from Xinerama void PScreen::initHeadsXinerama(void) { #ifdef HAVE_XINERAMA // Check if there are heads already initialized from example Randr if (! XineramaIsActive(_dpy)) { return; } int num_heads = 0; XineramaScreenInfo *infos = XineramaQueryScreens(_dpy, &num_heads); for (int i = 0; i < num_heads; ++i) { _heads.push_back(Head(infos[i].x_org, infos[i].y_org, infos[i].width, infos[i].height)); } XFree(infos); #endif // HAVE_XINERAMA } //! @brief Initialize head information from RandR void PScreen::initHeadsRandr(void) { #ifdef HAVE_XRANDR if (! _honour_randr || ! _has_extension_xrandr) { return; } XRRScreenResources *resources = XRRGetScreenResources(_dpy, _root); if (! resources) { return; } for (int i = 0; i < resources->noutput; ++i) { XRROutputInfo *output = XRRGetOutputInfo(_dpy, resources, resources->outputs[i]); if (output->crtc) { XRRCrtcInfo *crtc = XRRGetCrtcInfo(_dpy, resources, output->crtc); _heads.push_back(Head(crtc->x, crtc->y, crtc->width, crtc->height)); #ifdef DEBUG cerr << __FILE__ << "@" << __LINE__ << ": PScreen::initHeadsRandr() added head " << crtc->x << "," << crtc->y << "," << crtc->width << "," << crtc->height << endl; #endif // DEBUG XRRFreeCrtcInfo (crtc); } XRRFreeOutputInfo (output); } XRRFreeScreenResources (resources); #endif // HAVE_XRANDR } /** * Lookup mask from keycode. * * @param keycode KeyCode to lookup. * @return Mask for keycode, 0 if something fails. */ uint PScreen::getMaskFromKeycode(KeyCode keycode) { // Make sure modifier mappings were looked up ok if (! _modifier_map || _modifier_map->max_keypermod < 1) { return 0; } // .h files states that modifiermap is an 8 * max_keypermod array. int max_info = _modifier_map->max_keypermod * 8; for (int i = 0; i < max_info; ++i) { if (_modifier_map->modifiermap[i] == keycode) { return MODIFIER_TO_MASK[i / _modifier_map->max_keypermod]; } } return 0; } /** * Figure out what key you can press to generate mask * * @param mask Modifier mask to get keycode for. * @return KeyCode for mask, 0 if failing. */ KeyCode PScreen::getKeycodeFromMask(uint mask) { // Make sure modifier mappings were looked up ok if (! _modifier_map || _modifier_map->max_keypermod < 1) { return 0; } for (int i = 0; i < 8; ++i) { if (MODIFIER_TO_MASK[i] == mask) { // FIXME: Is iteration over the range required? return _modifier_map->modifiermap[i * _modifier_map->max_keypermod]; } } return 0; } |