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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include <X11/Xlib.h>
      9 #include <X11/Xatom.h>
     10 #include <X11/XKBlib.h>
     11 #include <GL/glx.h>
     12 #include <GL/gl.h>
     13 #include <GL/glu.h>
     14 
     15 #include "SkWindow.h"
     16 
     17 #include "SkBitmap.h"
     18 #include "SkCanvas.h"
     19 #include "SkColor.h"
     20 #include "SkEvent.h"
     21 #include "SkKey.h"
     22 #include "SkWindow.h"
     23 #include "XkeysToSkKeys.h"
     24 extern "C" {
     25     #include "keysym2ucs.h"
     26 }
     27 
     28 const int WIDTH = 500;
     29 const int HEIGHT = 500;
     30 
     31 // Determine which events to listen for.
     32 const long EVENT_MASK = StructureNotifyMask|ButtonPressMask|ButtonReleaseMask
     33         |ExposureMask|PointerMotionMask|KeyPressMask|KeyReleaseMask;
     34 
     35 SkOSWindow::SkOSWindow(void*)
     36     : fVi(NULL)
     37     , fMSAASampleCount(0) {
     38     fUnixWindow.fDisplay = NULL;
     39     fUnixWindow.fGLContext = NULL;
     40     this->initWindow(0, NULL);
     41     this->resize(WIDTH, HEIGHT);
     42 }
     43 
     44 SkOSWindow::~SkOSWindow() {
     45     this->closeWindow();
     46 }
     47 
     48 void SkOSWindow::closeWindow() {
     49     if (NULL != fUnixWindow.fDisplay) {
     50         this->detach();
     51         SkASSERT(NULL != fUnixWindow.fGc);
     52         XFreeGC(fUnixWindow.fDisplay, fUnixWindow.fGc);
     53         fUnixWindow.fGc = NULL;
     54         XDestroyWindow(fUnixWindow.fDisplay, fUnixWindow.fWin);
     55         fVi = NULL;
     56         XCloseDisplay(fUnixWindow.fDisplay);
     57         fUnixWindow.fDisplay = NULL;
     58         fMSAASampleCount = 0;
     59     }
     60 }
     61 
     62 void SkOSWindow::initWindow(int requestedMSAASampleCount, AttachmentInfo* info) {
     63     if (fMSAASampleCount != requestedMSAASampleCount) {
     64         this->closeWindow();
     65     }
     66     // presence of fDisplay means we already have a window
     67     if (NULL != fUnixWindow.fDisplay) {
     68         if (NULL != info) {
     69             if (NULL != fVi) {
     70                 glXGetConfig(fUnixWindow.fDisplay, fVi, GLX_SAMPLES_ARB, &info->fSampleCount);
     71                 glXGetConfig(fUnixWindow.fDisplay, fVi, GLX_STENCIL_SIZE, &info->fStencilBits);
     72             } else {
     73                 info->fSampleCount = 0;
     74                 info->fStencilBits = 0;
     75             }
     76         }
     77         return;
     78     }
     79     fUnixWindow.fDisplay = XOpenDisplay(NULL);
     80     Display* dsp = fUnixWindow.fDisplay;
     81     if (NULL == dsp) {
     82         SkDebugf("Could not open an X Display");
     83         return;
     84     }
     85     // Attempt to create a window that supports GL
     86     GLint att[] = {
     87         GLX_RGBA,
     88         GLX_DEPTH_SIZE, 24,
     89         GLX_DOUBLEBUFFER,
     90         GLX_STENCIL_SIZE, 8,
     91         None
     92     };
     93     SkASSERT(NULL == fVi);
     94     if (requestedMSAASampleCount > 0) {
     95         static const GLint kAttCount = SK_ARRAY_COUNT(att);
     96         GLint msaaAtt[kAttCount + 4];
     97         memcpy(msaaAtt, att, sizeof(att));
     98         SkASSERT(None == msaaAtt[kAttCount - 1]);
     99         msaaAtt[kAttCount - 1] = GLX_SAMPLE_BUFFERS_ARB;
    100         msaaAtt[kAttCount + 0] = 1;
    101         msaaAtt[kAttCount + 1] = GLX_SAMPLES_ARB;
    102         msaaAtt[kAttCount + 2] = requestedMSAASampleCount;
    103         msaaAtt[kAttCount + 3] = None;
    104         fVi = glXChooseVisual(dsp, DefaultScreen(dsp), msaaAtt);
    105         fMSAASampleCount = requestedMSAASampleCount;
    106     }
    107     if (NULL == fVi) {
    108         fVi = glXChooseVisual(dsp, DefaultScreen(dsp), att);
    109         fMSAASampleCount = 0;
    110     }
    111 
    112     if (fVi) {
    113         if (NULL != info) {
    114             glXGetConfig(dsp, fVi, GLX_SAMPLES_ARB, &info->fSampleCount);
    115             glXGetConfig(dsp, fVi, GLX_STENCIL_SIZE, &info->fStencilBits);
    116         }
    117         Colormap colorMap = XCreateColormap(dsp,
    118                                             RootWindow(dsp, fVi->screen),
    119                                             fVi->visual,
    120                                              AllocNone);
    121         XSetWindowAttributes swa;
    122         swa.colormap = colorMap;
    123         swa.event_mask = EVENT_MASK;
    124         fUnixWindow.fWin = XCreateWindow(dsp,
    125                                          RootWindow(dsp, fVi->screen),
    126                                          0, 0, // x, y
    127                                          WIDTH, HEIGHT,
    128                                          0, // border width
    129                                          fVi->depth,
    130                                          InputOutput,
    131                                          fVi->visual,
    132                                          CWEventMask | CWColormap,
    133                                          &swa);
    134     } else {
    135         if (NULL != info) {
    136             info->fSampleCount = 0;
    137             info->fStencilBits = 0;
    138         }
    139         // Create a simple window instead.  We will not be able to show GL
    140         fUnixWindow.fWin = XCreateSimpleWindow(dsp,
    141                                                DefaultRootWindow(dsp),
    142                                                0, 0,  // x, y
    143                                                WIDTH, HEIGHT,
    144                                                0,     // border width
    145                                                0,     // border value
    146                                                0);    // background value
    147     }
    148     this->mapWindowAndWait();
    149     fUnixWindow.fGc = XCreateGC(dsp, fUnixWindow.fWin, 0, NULL);
    150 }
    151 
    152 static unsigned getModi(const XEvent& evt) {
    153     static const struct {
    154         unsigned    fXMask;
    155         unsigned    fSkMask;
    156     } gModi[] = {
    157         // X values found by experiment. Is there a better way?
    158         { 1,    kShift_SkModifierKey },
    159         { 4,    kControl_SkModifierKey },
    160         { 8,    kOption_SkModifierKey },
    161     };
    162 
    163     unsigned modi = 0;
    164     for (size_t i = 0; i < SK_ARRAY_COUNT(gModi); ++i) {
    165         if (evt.xkey.state & gModi[i].fXMask) {
    166             modi |= gModi[i].fSkMask;
    167         }
    168     }
    169     return modi;
    170 }
    171 
    172 static SkMSec gTimerDelay;
    173 
    174 static bool MyXNextEventWithDelay(Display* dsp, XEvent* evt) {
    175     // Check for pending events before entering the select loop. There might
    176     // be events in the in-memory queue but not processed yet.
    177     if (XPending(dsp)) {
    178         XNextEvent(dsp, evt);
    179         return true;
    180     }
    181 
    182     SkMSec ms = gTimerDelay;
    183     if (ms > 0) {
    184         int x11_fd = ConnectionNumber(dsp);
    185         fd_set input_fds;
    186         FD_ZERO(&input_fds);
    187         FD_SET(x11_fd, &input_fds);
    188 
    189         timeval tv;
    190         tv.tv_sec = ms / 1000;              // seconds
    191         tv.tv_usec = (ms % 1000) * 1000;    // microseconds
    192 
    193         if (!select(x11_fd + 1, &input_fds, NULL, NULL, &tv)) {
    194             if (!XPending(dsp)) {
    195                 return false;
    196             }
    197         }
    198     }
    199     XNextEvent(dsp, evt);
    200     return true;
    201 }
    202 
    203 SkOSWindow::NextXEventResult SkOSWindow::nextXEvent() {
    204     XEvent evt;
    205     Display* dsp = fUnixWindow.fDisplay;
    206 
    207     if (!MyXNextEventWithDelay(fUnixWindow.fDisplay, &evt)) {
    208         return kContinue_NextXEventResult;
    209     }
    210 
    211     switch (evt.type) {
    212         case Expose:
    213             if (0 == evt.xexpose.count) {
    214                 return kPaintRequest_NextXEventResult;
    215             }
    216             break;
    217         case ConfigureNotify:
    218             this->resize(evt.xconfigure.width, evt.xconfigure.height);
    219             break;
    220         case ButtonPress:
    221             if (evt.xbutton.button == Button1)
    222                 this->handleClick(evt.xbutton.x, evt.xbutton.y,
    223                             SkView::Click::kDown_State, NULL, getModi(evt));
    224             break;
    225         case ButtonRelease:
    226             if (evt.xbutton.button == Button1)
    227                 this->handleClick(evt.xbutton.x, evt.xbutton.y,
    228                               SkView::Click::kUp_State, NULL, getModi(evt));
    229             break;
    230         case MotionNotify:
    231             this->handleClick(evt.xmotion.x, evt.xmotion.y,
    232                            SkView::Click::kMoved_State, NULL, getModi(evt));
    233             break;
    234         case KeyPress: {
    235             int shiftLevel = (evt.xkey.state & ShiftMask) ? 1 : 0;
    236             KeySym keysym = XkbKeycodeToKeysym(dsp, evt.xkey.keycode,
    237                                                0, shiftLevel);
    238             if (keysym == XK_Escape) {
    239                 return kQuitRequest_NextXEventResult;
    240             }
    241             this->handleKey(XKeyToSkKey(keysym));
    242             long uni = keysym2ucs(keysym);
    243             if (uni != -1) {
    244                 this->handleChar((SkUnichar) uni);
    245             }
    246             break;
    247         }
    248         case KeyRelease:
    249             this->handleKeyUp(XKeyToSkKey(XkbKeycodeToKeysym(dsp, evt.xkey.keycode, 0, 0)));
    250             break;
    251         default:
    252             // Do nothing for other events
    253             break;
    254     }
    255     return kContinue_NextXEventResult;
    256 }
    257 
    258 void SkOSWindow::loop() {
    259     Display* dsp = fUnixWindow.fDisplay;
    260     if (NULL == dsp) {
    261         return;
    262     }
    263     Window win = fUnixWindow.fWin;
    264 
    265     XSelectInput(dsp, win, EVENT_MASK);
    266 
    267     bool sentExposeEvent = false;
    268 
    269     for (;;) {
    270         SkEvent::ServiceQueueTimer();
    271 
    272         bool moreToDo = SkEvent::ProcessEvent();
    273 
    274         if (this->isDirty() && !sentExposeEvent) {
    275             sentExposeEvent = true;
    276 
    277             XEvent evt;
    278             sk_bzero(&evt, sizeof(evt));
    279             evt.type = Expose;
    280             evt.xexpose.display = dsp;
    281             XSendEvent(dsp, win, false, ExposureMask, &evt);
    282         }
    283 
    284         if (XPending(dsp) || !moreToDo) {
    285             switch (this->nextXEvent()) {
    286                 case kContinue_NextXEventResult:
    287                     break;
    288                 case kPaintRequest_NextXEventResult:
    289                     sentExposeEvent = false;
    290                     if (this->isDirty()) {
    291                         this->update(NULL);
    292                     }
    293                     this->doPaint();
    294                     break;
    295                 case kQuitRequest_NextXEventResult:
    296                     return;
    297             }
    298         }
    299     }
    300 }
    301 
    302 void SkOSWindow::mapWindowAndWait() {
    303     SkASSERT(NULL != fUnixWindow.fDisplay);
    304     Display* dsp = fUnixWindow.fDisplay;
    305     Window win = fUnixWindow.fWin;
    306     XMapWindow(dsp, win);
    307 
    308     long eventMask = StructureNotifyMask;
    309     XSelectInput(dsp, win, eventMask);
    310 
    311     // Wait until screen is ready.
    312     XEvent evt;
    313     do {
    314         XNextEvent(dsp, &evt);
    315     } while(evt.type != MapNotify);
    316 
    317 }
    318 
    319 bool SkOSWindow::attach(SkBackEndTypes, int msaaSampleCount, AttachmentInfo* info) {
    320     this->initWindow(msaaSampleCount, info);
    321 
    322     if (NULL == fUnixWindow.fDisplay) {
    323         return false;
    324     }
    325     if (NULL == fUnixWindow.fGLContext) {
    326         SkASSERT(NULL != fVi);
    327 
    328         fUnixWindow.fGLContext = glXCreateContext(fUnixWindow.fDisplay,
    329                                                   fVi,
    330                                                   NULL,
    331                                                   GL_TRUE);
    332         if (NULL == fUnixWindow.fGLContext) {
    333             return false;
    334         }
    335     }
    336     glXMakeCurrent(fUnixWindow.fDisplay,
    337                    fUnixWindow.fWin,
    338                    fUnixWindow.fGLContext);
    339     glViewport(0, 0,
    340                SkScalarRoundToInt(this->width()),
    341                SkScalarRoundToInt(this->height()));
    342     glClearColor(0, 0, 0, 0);
    343     glClearStencil(0);
    344     glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    345     return true;
    346 }
    347 
    348 void SkOSWindow::detach() {
    349     if (NULL == fUnixWindow.fDisplay || NULL == fUnixWindow.fGLContext) {
    350         return;
    351     }
    352     glXMakeCurrent(fUnixWindow.fDisplay, None, NULL);
    353     glXDestroyContext(fUnixWindow.fDisplay, fUnixWindow.fGLContext);
    354     fUnixWindow.fGLContext = NULL;
    355 }
    356 
    357 void SkOSWindow::present() {
    358     if (NULL != fUnixWindow.fDisplay && NULL != fUnixWindow.fGLContext) {
    359         glXSwapBuffers(fUnixWindow.fDisplay, fUnixWindow.fWin);
    360     }
    361 }
    362 
    363 void SkOSWindow::onSetTitle(const char title[]) {
    364     if (NULL == fUnixWindow.fDisplay) {
    365         return;
    366     }
    367     XTextProperty textProp;
    368     textProp.value = (unsigned char*)title;
    369     textProp.format = 8;
    370     textProp.nitems = strlen((char*)textProp.value);
    371     textProp.encoding = XA_STRING;
    372     XSetWMName(fUnixWindow.fDisplay, fUnixWindow.fWin, &textProp);
    373 }
    374 
    375 static bool convertBitmapToXImage(XImage& image, const SkBitmap& bitmap) {
    376     sk_bzero(&image, sizeof(image));
    377 
    378     int bitsPerPixel = bitmap.bytesPerPixel() * 8;
    379     image.width = bitmap.width();
    380     image.height = bitmap.height();
    381     image.format = ZPixmap;
    382     image.data = (char*) bitmap.getPixels();
    383     image.byte_order = LSBFirst;
    384     image.bitmap_unit = bitsPerPixel;
    385     image.bitmap_bit_order = LSBFirst;
    386     image.bitmap_pad = bitsPerPixel;
    387     image.depth = 24;
    388     image.bytes_per_line = bitmap.rowBytes() - bitmap.width() * 4;
    389     image.bits_per_pixel = bitsPerPixel;
    390     return XInitImage(&image);
    391 }
    392 
    393 void SkOSWindow::doPaint() {
    394     if (NULL == fUnixWindow.fDisplay) {
    395         return;
    396     }
    397     // If we are drawing with GL, we don't need XPutImage.
    398     if (NULL != fUnixWindow.fGLContext) {
    399         return;
    400     }
    401     // Draw the bitmap to the screen.
    402     const SkBitmap& bitmap = getBitmap();
    403     int width = bitmap.width();
    404     int height = bitmap.height();
    405 
    406     XImage image;
    407     if (!convertBitmapToXImage(image, bitmap)) {
    408         return;
    409     }
    410 
    411     XPutImage(fUnixWindow.fDisplay,
    412               fUnixWindow.fWin,
    413               fUnixWindow.fGc,
    414               &image,
    415               0, 0,     // src x,y
    416               0, 0,     // dst x,y
    417               width, height);
    418 }
    419 
    420 ///////////////////////////////////////////////////////////////////////////////
    421 
    422 void SkEvent::SignalNonEmptyQueue() {
    423     // nothing to do, since we spin on our event-queue, polling for XPending
    424 }
    425 
    426 void SkEvent::SignalQueueTimer(SkMSec delay) {
    427     // just need to record the delay time. We handle waking up for it in
    428     // MyXNextEventWithDelay()
    429     gTimerDelay = delay;
    430 }
    431