michael@0: // screen.js:
michael@0: // Set the screen size, pixel density and scaling of the b2g client screen
michael@0: // based on the --screen command-line option, if there is one.
michael@0: // 
michael@0: // TODO: support multiple device pixels per CSS pixel
michael@0: // 
michael@0: 
michael@0: // We do this on ContentStart because querying the displayDPI fails otherwise.
michael@0: window.addEventListener('ContentStart', function() {
michael@0:   // This is the toplevel <window> element
michael@0:   let shell = document.getElementById('shell');
michael@0: 
michael@0:   // The <browser> element inside it
michael@0:   let browser = document.getElementById('systemapp');
michael@0: 
michael@0:   // Figure out the native resolution of the screen
michael@0:   let windowUtils = window.QueryInterface(Ci.nsIInterfaceRequestor)
michael@0:     .getInterface(Components.interfaces.nsIDOMWindowUtils);
michael@0:   let hostDPI = windowUtils.displayDPI;
michael@0: 
michael@0:   let DEFAULT_SCREEN = '320x480';
michael@0: 
michael@0:   // This is a somewhat random selection of named screens.
michael@0:   // Add more to this list when we support more hardware.
michael@0:   // Data from: http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density
michael@0:   let screens = {
michael@0:     iphone: {
michael@0:       name: 'Apple iPhone', width:320, height:480,  dpi:163
michael@0:     },
michael@0:     ipad: {
michael@0:       name: 'Apple iPad', width:1024, height:768,  dpi:132
michael@0:     },
michael@0:     nexus_s: {
michael@0:       name: 'Samsung Nexus S', width:480, height:800, dpi:235
michael@0:     },
michael@0:     galaxy_s2: {
michael@0:       name: 'Samsung Galaxy SII (I9100)', width:480, height:800, dpi:219
michael@0:     },
michael@0:     galaxy_nexus: {
michael@0:       name: 'Samsung Galaxy Nexus', width:720, height:1280, dpi:316
michael@0:     },
michael@0:     galaxy_tab: {
michael@0:       name: 'Samsung Galaxy Tab 10.1', width:800, height:1280, dpi:149
michael@0:     },
michael@0:     wildfire: {
michael@0:       name: 'HTC Wildfire', width:240, height:320, dpi:125
michael@0:     },
michael@0:     tattoo: {
michael@0:       name: 'HTC Tattoo', width:240, height:320, dpi:143
michael@0:     },
michael@0:     salsa: {
michael@0:       name: 'HTC Salsa', width:320, height:480, dpi:170
michael@0:     },
michael@0:     chacha: {
michael@0:       name: 'HTC ChaCha', width:320, height:480, dpi:222
michael@0:     },
michael@0:   };
michael@0: 
michael@0:   // Get the command line arguments that were passed to the b2g client
michael@0:   let args;
michael@0:   try {
michael@0:     // On Firefox Mulet, we don't always have a command line argument
michael@0:     args = window.arguments[0].QueryInterface(Ci.nsICommandLine);
michael@0:   } catch(e) {}
michael@0: 
michael@0:   let screenarg = null;
michael@0: 
michael@0:   // Get the --screen argument from the command line
michael@0:   try {
michael@0:     if (args) {
michael@0:       screenarg = args.handleFlagWithParam('screen', false);
michael@0:     }
michael@0: 
michael@0:     // If there isn't one, use the default screen
michael@0:     if (screenarg === null)
michael@0:       screenarg = DEFAULT_SCREEN;
michael@0: 
michael@0:     // With no value, tell the user how to use it
michael@0:     if (screenarg == '')
michael@0:       usage();
michael@0:   }
michael@0:   catch(e) {
michael@0:     // If getting the argument value fails, its an error
michael@0:     usage();
michael@0:   }
michael@0:   
michael@0:   // Special case --screen=full goes into fullscreen mode
michael@0:   if (screenarg === 'full') {
michael@0:     shell.setAttribute('sizemode', 'fullscreen');
michael@0:     return;
michael@0:   } 
michael@0: 
michael@0:   let rescale = false;
michael@0: 
michael@0:   // If the value of --screen ends with !, we'll be scaling the output
michael@0:   if (screenarg[screenarg.length - 1] === '!') {
michael@0:     rescale = true;
michael@0:     screenarg = screenarg.substring(0, screenarg.length-1);
michael@0:   }
michael@0: 
michael@0:   let width, height, dpi;
michael@0: 
michael@0:   if (screenarg in screens) {
michael@0:     // If this is a named screen, get its data
michael@0:     let screen = screens[screenarg];
michael@0:     width = screen.width;
michael@0:     height = screen.height;
michael@0:     dpi = screen.dpi;
michael@0:   } else {
michael@0:     // Otherwise, parse the resolution and density from the --screen value.
michael@0:     // The supported syntax is WIDTHxHEIGHT[@DPI]
michael@0:     let match = screenarg.match(/^(\d+)x(\d+)(@(\d+))?$/);
michael@0:     
michael@0:     // Display usage information on syntax errors
michael@0:     if (match == null)
michael@0:       usage();
michael@0:     
michael@0:     // Convert strings to integers
michael@0:     width = parseInt(match[1], 10);
michael@0:     height = parseInt(match[2], 10);
michael@0:     if (match[4])
michael@0:       dpi = parseInt(match[4], 10);
michael@0:     else    // If no DPI, use the actual dpi of the host screen
michael@0:       dpi = hostDPI;
michael@0: 
michael@0:     // If any of the values came out 0 or NaN or undefined, display usage
michael@0:     if (!width || !height || !dpi)
michael@0:       usage();
michael@0:   }
michael@0: 
michael@0:   Cu.import("resource://gre/modules/GlobalSimulatorScreen.jsm");
michael@0:   function resize(width, height, dpi, shouldFlip) {
michael@0:     GlobalSimulatorScreen.width = width;
michael@0:     GlobalSimulatorScreen.height = height;
michael@0: 
michael@0:     // In order to do rescaling, we set the <browser> tag to the specified
michael@0:     // width and height, and then use a CSS transform to scale it so that
michael@0:     // it appears at the correct size on the host display.  We also set
michael@0:     // the size of the <window> element to that scaled target size.
michael@0:     let scale = rescale ? hostDPI / dpi : 1;
michael@0: 
michael@0:     // Set the window width and height to desired size plus chrome
michael@0:     // Include the size of the toolbox displayed under the system app
michael@0:     let controls = document.getElementById('controls');
michael@0:     let controlsHeight = 0;
michael@0:     if (controls) {
michael@0:       controlsHeight = controls.getBoundingClientRect().height;
michael@0:     }
michael@0:     let chromewidth = window.outerWidth - window.innerWidth;
michael@0:     let chromeheight = window.outerHeight - window.innerHeight + controlsHeight;
michael@0:     window.resizeTo(Math.round(width * scale) + chromewidth,
michael@0:                     Math.round(height * scale) + chromeheight);
michael@0: 
michael@0:     let frameWidth = width, frameHeight = height;
michael@0:     if (shouldFlip) {
michael@0:       frameWidth = height;
michael@0:       frameHeight = width;
michael@0:     }
michael@0: 
michael@0:     // Set the browser element to the full unscaled size of the screen
michael@0:     let style = browser.style;
michael@0:     style.width = style.minWidth = style.maxWidth =
michael@0:       frameWidth + 'px';
michael@0:     style.height = style.minHeight = style.maxHeight =
michael@0:       frameHeight + 'px';
michael@0:     browser.setAttribute('flex', '0');  // Don't let it stretch
michael@0: 
michael@0:     style.transformOrigin = '';
michael@0:     style.transform = '';
michael@0: 
michael@0:     // Now scale the browser element as needed
michael@0:     if (scale !== 1) {
michael@0:       style.transformOrigin = 'top left';
michael@0:       style.transform += ' scale(' + scale + ',' + scale + ')';
michael@0:     }
michael@0: 
michael@0:     if (shouldFlip) {
michael@0:       // Display the system app with a 90° clockwise rotation
michael@0:       let shift = Math.floor(Math.abs(frameWidth-frameHeight) / 2);
michael@0:       style.transform +=
michael@0:         ' rotate(0.25turn) translate(-' + shift + 'px, -' + shift + 'px)';
michael@0:     }
michael@0: 
michael@0:     // Set the pixel density that we want to simulate.
michael@0:     // This doesn't change the on-screen size, but makes
michael@0:     // CSS media queries and mozmm units work right.
michael@0:     Services.prefs.setIntPref('layout.css.dpi', dpi);
michael@0:   }
michael@0: 
michael@0:   // Resize on startup
michael@0:   resize(width, height, dpi, false);
michael@0: 
michael@0:   let defaultOrientation = width < height ? 'portrait' : 'landscape';
michael@0: 
michael@0:   // Then resize on each rotation button click,
michael@0:   // or when the system app lock/unlock the orientation
michael@0:   Services.obs.addObserver(function orientationChangeListener(subject) {
michael@0:     let screen = subject.wrappedJSObject;
michael@0:     let { mozOrientation, screenOrientation } = screen;
michael@0: 
michael@0:     let newWidth = width;
michael@0:     let newHeight = height;
michael@0:     // If we have an orientation different than the startup one,
michael@0:     // we switch the sizes
michael@0:     if (screenOrientation != defaultOrientation) {
michael@0:       newWidth = height;
michael@0:       newHeight = width;
michael@0:     }
michael@0: 
michael@0:     // If the current app doesn't supports the current screen orientation
michael@0:     // still resize the window, but rotate its frame so that
michael@0:     // it is displayed rotated on the side
michael@0:     let shouldFlip = mozOrientation != screenOrientation;
michael@0: 
michael@0:     resize(newWidth, newHeight, dpi, shouldFlip);
michael@0:   }, 'simulator-adjust-window-size', false);
michael@0: 
michael@0:   // A utility function like console.log() for printing to the terminal window
michael@0:   // Uses dump(), but enables it first, if necessary
michael@0:   function print() {
michael@0:     let dump_enabled =
michael@0:       Services.prefs.getBoolPref('browser.dom.window.dump.enabled');
michael@0: 
michael@0:     if (!dump_enabled)
michael@0:       Services.prefs.setBoolPref('browser.dom.window.dump.enabled', true);
michael@0: 
michael@0:     dump(Array.prototype.join.call(arguments, ' ') + '\n');
michael@0: 
michael@0:     if (!dump_enabled) 
michael@0:       Services.prefs.setBoolPref('browser.dom.window.dump.enabled', false);
michael@0:   }
michael@0: 
michael@0:   // Print usage info for --screen and exit
michael@0:   function usage() {
michael@0:     // Documentation for the --screen argument
michael@0:     let msg = 
michael@0:       'The --screen argument specifies the desired resolution and\n' +
michael@0:       'pixel density of the simulated device screen. Use it like this:\n' +
michael@0:       '\t--screen=WIDTHxHEIGHT\t\t\t// E.g.: --screen=320x480\n' +
michael@0:       '\t--screen=WIDTHxHEIGHT@DOTS_PER_INCH\t// E.g.: --screen=480x800@250\n' +
michael@0:       '\t--screen=full\t\t\t\t// run in fullscreen mode\n' +
michael@0:       '\nYou can also specify certain device names:\n';
michael@0:     for(let p in screens)
michael@0:       msg += '\t--screen=' + p + '\t// ' + screens[p].name + '\n';
michael@0:     msg += 
michael@0:       '\nAdd a ! to the end of a screen specification to rescale the\n' +
michael@0:       'screen so that it is shown at actual size on your monitor:\n' +
michael@0:       '\t--screen=nexus_s!\n' +
michael@0:       '\t--screen=320x480@200!\n'
michael@0:     ;
michael@0: 
michael@0:     // Display the usage message
michael@0:     print(msg);
michael@0: 
michael@0:     // Exit the b2g client
michael@0:     Services.startup.quit(Ci.nsIAppStartup.eAttemptQuit);
michael@0:   }
michael@0: });