/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Android code. * * The Initial Developer of the Original Code is Mozilla Foundation. * Portions created by the Initial Developer are Copyright (C) 2009-2010 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Patrick Walton * Chris Lord * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ package org.mozilla.gecko.gfx; import org.mozilla.gecko.FloatUtils; import org.mozilla.gecko.GeckoApp; import org.mozilla.gecko.GeckoAppShell; import org.mozilla.gecko.GeckoEvent; import org.mozilla.gecko.GeckoEventResponder; import org.json.JSONException; import org.json.JSONObject; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Point; import android.graphics.PointF; import android.graphics.Rect; import android.graphics.RectF; import android.os.SystemClock; import android.util.DisplayMetrics; import android.util.Log; import android.view.View; public class GeckoLayerClient implements GeckoEventResponder, FlexibleGLSurfaceView.Listener { private static final String LOGTAG = "GeckoLayerClient"; private LayerController mLayerController; private LayerRenderer mLayerRenderer; private boolean mLayerRendererInitialized; private IntSize mScreenSize; private IntSize mWindowSize; private DisplayPortMetrics mDisplayPort; private DisplayPortMetrics mReturnDisplayPort; private VirtualLayer mRootLayer; /* The Gecko viewport as per the UI thread. Must be touched only on the UI thread. */ private ViewportMetrics mGeckoViewport; /* * The viewport metrics being used to draw the current frame. This is only * accessed by the compositor thread, and so needs no synchronisation. */ private ImmutableViewportMetrics mFrameMetrics; private String mLastCheckerboardColor; /* Used by robocop for testing purposes */ private DrawListener mDrawListener; /* Used as a temporary ViewTransform by syncViewportInfo */ private ViewTransform mCurrentViewTransform; public GeckoLayerClient(Context context) { // we can fill these in with dummy values because they are always written // to before being read mScreenSize = new IntSize(0, 0); mWindowSize = new IntSize(0, 0); mDisplayPort = new DisplayPortMetrics(); mCurrentViewTransform = new ViewTransform(0, 0, 1); } /** Attaches the root layer to the layer controller so that Gecko appears. */ void setLayerController(LayerController layerController) { LayerView view = layerController.getView(); mLayerController = layerController; mRootLayer = new VirtualLayer(new IntSize(view.getWidth(), view.getHeight())); mLayerRenderer = new LayerRenderer(view); GeckoAppShell.registerGeckoEventListener("Viewport:Update", this); GeckoAppShell.registerGeckoEventListener("Viewport:PageSize", this); GeckoAppShell.registerGeckoEventListener("Viewport:CalculateDisplayPort", this); GeckoAppShell.registerGeckoEventListener("Checkerboard:Toggle", this); view.setListener(this); view.setLayerRenderer(mLayerRenderer); layerController.setRoot(mRootLayer); sendResizeEventIfNecessary(true); } DisplayPortMetrics getDisplayPort() { return mDisplayPort; } /* Informs Gecko that the screen size has changed. */ private void sendResizeEventIfNecessary(boolean force) { DisplayMetrics metrics = new DisplayMetrics(); GeckoApp.mAppContext.getWindowManager().getDefaultDisplay().getMetrics(metrics); View view = mLayerController.getView(); IntSize newScreenSize = new IntSize(metrics.widthPixels, metrics.heightPixels); IntSize newWindowSize = new IntSize(view.getWidth(), view.getHeight()); boolean screenSizeChanged = !mScreenSize.equals(newScreenSize); boolean windowSizeChanged = !mWindowSize.equals(newWindowSize); if (!force && !screenSizeChanged && !windowSizeChanged) { return; } mScreenSize = newScreenSize; mWindowSize = newWindowSize; if (screenSizeChanged) { Log.d(LOGTAG, "Screen-size changed to " + mScreenSize); } if (windowSizeChanged) { Log.d(LOGTAG, "Window-size changed to " + mWindowSize); } GeckoEvent event = GeckoEvent.createSizeChangedEvent(mWindowSize.width, mWindowSize.height, mScreenSize.width, mScreenSize.height); GeckoAppShell.sendEventToGecko(event); } public Bitmap getBitmap() { return null; } void viewportSizeChanged() { // here we send gecko a resize message. The code in browser.js is responsible for // picking up on that resize event, modifying the viewport as necessary, and informing // us of the new viewport. sendResizeEventIfNecessary(true); // the following call also sends gecko a message, which will be processed after the resize // message above has updated the viewport. this message ensures that if we have just put // focus in a text field, we scroll the content so that the text field is in view. GeckoAppShell.viewSizeChanged(); } private void adjustViewport() { ViewportMetrics viewportMetrics = new ViewportMetrics(mLayerController.getViewportMetrics()); viewportMetrics.setViewport(viewportMetrics.getClampedViewport()); mDisplayPort = DisplayPortCalculator.calculate(mLayerController.getViewportMetrics(), mLayerController.getPanZoomController().getVelocityVector()); GeckoAppShell.sendEventToGecko(GeckoEvent.createViewportEvent(viewportMetrics, mDisplayPort)); mGeckoViewport = viewportMetrics; } /** * The different types of Viewport messages handled. All viewport events * expect a display-port to be returned, but can handle one not being * returned. */ private enum ViewportMessageType { UPDATE, // The viewport has changed and should be entirely updated PAGE_SIZE // The viewport's page-size has changed } /** Viewport message handler. */ private void handleViewportMessage(JSONObject message, ViewportMessageType type) throws JSONException { ViewportMetrics messageMetrics = new ViewportMetrics(message); synchronized (mLayerController) { final ViewportMetrics newMetrics; ImmutableViewportMetrics oldMetrics = mLayerController.getViewportMetrics(); switch (type) { default: case UPDATE: newMetrics = messageMetrics; // Keep the old viewport size newMetrics.setSize(oldMetrics.getSize()); mLayerController.abortPanZoomAnimation(); break; case PAGE_SIZE: newMetrics = new ViewportMetrics(oldMetrics); newMetrics.setPageSize(messageMetrics.getPageSize()); break; } mLayerController.post(new Runnable() { public void run() { mGeckoViewport = newMetrics; } }); mLayerController.setViewportMetrics(newMetrics); mDisplayPort = DisplayPortCalculator.calculate(mLayerController.getViewportMetrics(), null); } mReturnDisplayPort = mDisplayPort; } /** Implementation of GeckoEventResponder/GeckoEventListener. */ public void handleMessage(String event, JSONObject message) { try { if ("Viewport:Update".equals(event)) { handleViewportMessage(message, ViewportMessageType.UPDATE); } else if ("Viewport:PageSize".equals(event)) { handleViewportMessage(message, ViewportMessageType.PAGE_SIZE); } else if ("Viewport:CalculateDisplayPort".equals(event)) { ImmutableViewportMetrics newMetrics = new ImmutableViewportMetrics(new ViewportMetrics(message)); mReturnDisplayPort = DisplayPortCalculator.calculate(newMetrics, null); } else if ("Checkerboard:Toggle".equals(event)) { try { boolean showChecks = message.getBoolean("value"); mLayerController.setCheckerboardShowChecks(showChecks); Log.i(LOGTAG, "Showing checks: " + showChecks); } catch(JSONException ex) { Log.e(LOGTAG, "Error decoding JSON", ex); } } } catch (JSONException e) { Log.e(LOGTAG, "Unable to create viewport metrics in " + event + " handler", e); } } /** Implementation of GeckoEventResponder. */ public String getResponse() { // We are responding to the events handled in handleMessage() above with the // display port we calculated. Different messages will generate different // display ports and put them in mReturnDisplayPort, so we just return that. // Note that mReturnDisplayPort is always touched on the Gecko thread, so // no synchronization is needed for it. if (mReturnDisplayPort == null) { return ""; } try { return mReturnDisplayPort.toJSON(); } finally { mReturnDisplayPort = null; } } void geometryChanged() { /* Let Gecko know if the screensize has changed */ sendResizeEventIfNecessary(false); if (mLayerController.getRedrawHint()) adjustViewport(); } /* * This function returns the last viewport that we sent to Gecko. If any additional events are * being sent to Gecko that are relative on the Gecko viewport position, they must (a) be relative * to this viewport, and (b) be sent on the UI thread to avoid races. As long as these two * conditions are satisfied, and the events being sent to Gecko are processed in FIFO order, the * events will properly be relative to the Gecko viewport position. Note that if Gecko updates * its viewport independently, we get notified synchronously and also update this on the UI thread. */ public ViewportMetrics getGeckoViewportMetrics() { return mGeckoViewport; } /** This function is invoked by Gecko via JNI; be careful when modifying signature. * The compositor invokes this function just before compositing a frame where the document * is different from the document composited on the last frame. In these cases, the viewport * information we have in Java is no longer valid and needs to be replaced with the new * viewport information provided. setPageSize will never be invoked on the same frame that * this function is invoked on; and this function will always be called prior to syncViewportInfo. */ public void setFirstPaintViewport(float offsetX, float offsetY, float zoom, float pageWidth, float pageHeight) { synchronized (mLayerController) { ViewportMetrics currentMetrics = new ViewportMetrics(mLayerController.getViewportMetrics()); currentMetrics.setOrigin(new PointF(offsetX, offsetY)); currentMetrics.setZoomFactor(zoom); currentMetrics.setPageSize(new FloatSize(pageWidth, pageHeight)); mLayerController.setViewportMetrics(currentMetrics); // At this point, we have just switched to displaying a different document than we // we previously displaying. This means we need to abort any panning/zooming animations // that are in progress and send an updated display port request to browser.js as soon // as possible. We accomplish this by passing true to abortPanZoomAnimation, which // sends the request after aborting the animation. The display port request is actually // a full viewport update, which is fine because if browser.js has somehow moved to // be out of sync with this first-paint viewport, then we force them back in sync. mLayerController.abortPanZoomAnimation(); mLayerController.getView().setPaintState(LayerView.PAINT_BEFORE_FIRST); } } /** This function is invoked by Gecko via JNI; be careful when modifying signature. * The compositor invokes this function whenever it determines that the page size * has changed (based on the information it gets from layout). If setFirstPaintViewport * is invoked on a frame, then this function will not be. For any given frame, this * function will be invoked before syncViewportInfo. */ public void setPageSize(float zoom, float pageWidth, float pageHeight) { synchronized (mLayerController) { // adjust the page dimensions to account for differences in zoom // between the rendered content (which is what the compositor tells us) // and our zoom level (which may have diverged). float ourZoom = mLayerController.getZoomFactor(); pageWidth = pageWidth * ourZoom / zoom; pageHeight = pageHeight * ourZoom /zoom; mLayerController.setPageSize(new FloatSize(pageWidth, pageHeight)); // Here the page size of the document has changed, but the document being displayed // is still the same. Therefore, we don't need to send anything to browser.js; any // changes we need to make to the display port will get sent the next time we call // adjustViewport(). } } /** This function is invoked by Gecko via JNI; be careful when modifying signature. * The compositor invokes this function on every frame to figure out what part of the * page to display, and to inform Java of the current display port. Since it is called * on every frame, it needs to be ultra-fast. * It avoids taking any locks or allocating any objects. We keep around a * mCurrentViewTransform so we don't need to allocate a new ViewTransform * everytime we're called. NOTE: we might be able to return a ImmutableViewportMetrics * which would avoid the copy into mCurrentViewTransform. */ public ViewTransform syncViewportInfo(int x, int y, int width, int height, float resolution, boolean layersUpdated) { // getViewportMetrics is thread safe so we don't need to synchronize // on mLayerController. // We save the viewport metrics here, so we later use it later in // createFrame (which will be called by nsWindow::DrawWindowUnderlay on // the native side, by the compositor). The LayerController's viewport // metrics can change between here and there, as it's accessed outside // of the compositor thread. mFrameMetrics = mLayerController.getViewportMetrics(); mCurrentViewTransform.x = mFrameMetrics.viewportRectLeft; mCurrentViewTransform.y = mFrameMetrics.viewportRectTop; mCurrentViewTransform.scale = mFrameMetrics.zoomFactor; mRootLayer.setPositionAndResolution(x, y, x + width, y + height, resolution); if (layersUpdated && mDrawListener != null) { /* Used by robocop for testing purposes */ mDrawListener.drawFinished(); } return mCurrentViewTransform; } /** This function is invoked by Gecko via JNI; be careful when modifying signature. */ public LayerRenderer.Frame createFrame() { // Create the shaders and textures if necessary. if (!mLayerRendererInitialized) { mLayerRenderer.checkMonitoringEnabled(); mLayerRenderer.createDefaultProgram(); mLayerRendererInitialized = true; } // Build the contexts and create the frame. Layer.RenderContext pageContext = mLayerRenderer.createPageContext(mFrameMetrics); Layer.RenderContext screenContext = mLayerRenderer.createScreenContext(); return mLayerRenderer.createFrame(pageContext, screenContext); } /** This function is invoked by Gecko via JNI; be careful when modifying signature. */ public void activateProgram() { mLayerRenderer.activateDefaultProgram(); } /** This function is invoked by Gecko via JNI; be careful when modifying signature. */ public void deactivateProgram() { mLayerRenderer.deactivateDefaultProgram(); } /** Implementation of FlexibleGLSurfaceView.Listener */ public void renderRequested() { GeckoAppShell.scheduleComposite(); } /** Implementation of FlexibleGLSurfaceView.Listener */ public void compositionPauseRequested() { // We need to coordinate with Gecko when pausing composition, to ensure // that Gecko never executes a draw event while the compositor is paused. GeckoAppShell.sendEventToGecko(GeckoEvent.createCompositorPauseEvent()); } /** Implementation of FlexibleGLSurfaceView.Listener */ public void compositionResumeRequested() { // Asking Gecko to resume the compositor takes too long (see // https://bugzilla.mozilla.org/show_bug.cgi?id=735230#c23), so we // resume the compositor directly. We still need to inform Gecko about // the compositor resuming, so that Gecko knows that it can now draw. GeckoAppShell.scheduleResumeComposition(); GeckoAppShell.sendEventToGecko(GeckoEvent.createCompositorResumeEvent()); } /** Implementation of FlexibleGLSurfaceView.Listener */ public void surfaceChanged(int width, int height) { mLayerController.setViewportSize(new FloatSize(width, height)); // We need to make this call even when the compositor isn't currently // paused (e.g. during an orientation change), to make the compositor // aware of the changed surface. compositionResumeRequested(); renderRequested(); } /** Used by robocop for testing purposes. Not for production use! This is called via reflection by robocop. */ public void setDrawListener(DrawListener listener) { mDrawListener = listener; } /** Used by robocop for testing purposes. Not for production use! This is used via reflection by robocop. */ public interface DrawListener { public void drawFinished(); } }