DevTools: Add feature to capture full-height screenshots

third_party/WebKit/Source/devtools/front_end/emulation/DeviceModeModel.js

Index: third_party/WebKit/Source/devtools/front_end/emulation/DeviceModeModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/emulation/DeviceModeModel.js b/third_party/WebKit/Source/devtools/front_end/emulation/DeviceModeModel.js
index bd206f7f032ed68b044970f5fef781ff119ad854..459d4656dccfbe8693b6a5d15c8675bfa02acad9 100644
--- a/third_party/WebKit/Source/devtools/front_end/emulation/DeviceModeModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/emulation/DeviceModeModel.js
@@ -273,6 +273,23 @@ Emulation.DeviceModeModel = class {
   }
 
   /**
+   * @return {boolean}
+   */
+  _isMobile() {
+    switch (this._type) {
+      case Emulation.DeviceModeModel.Type.Device:
+        return this._device.mobile();
+
+      case Emulation.DeviceModeModel.Type.None:
+        return false;
+
+      case Emulation.DeviceModeModel.Type.Responsive:
+        return this._uaSetting.get() === Emulation.DeviceModeModel.UA.Mobile ||
+            this._uaSetting.get() === Emulation.DeviceModeModel.UA.MobileNoTouch;
+    }
+  }
+
+  /**
    * @return {!Common.Setting}
    */
   scaleSetting() {
@@ -398,13 +415,13 @@ Emulation.DeviceModeModel = class {
   _calculateAndEmulate(resetPageScaleFactor) {
     if (!this._target)
       this._onTargetAvailable = this._calculateAndEmulate.bind(this, resetPageScaleFactor);
-
+    var mobile = this._isMobile();
     if (this._type === Emulation.DeviceModeModel.Type.Device) {
       var orientation = this._device.orientationByName(this._mode.orientation);
       var outline = this._currentOutline();
       var insets = this._currentInsets();
       this._fitScale = this._calculateFitScale(orientation.width, orientation.height, outline, insets);
-      if (this._device.mobile()) {
+      if (mobile) {
         this._appliedUserAgentType =
             this._device.touch() ? Emulation.DeviceModeModel.UA.Mobile : Emulation.DeviceModeModel.UA.MobileNoTouch;
       } else {
@@ -413,16 +430,16 @@ Emulation.DeviceModeModel = class {
       }
       this._applyDeviceMetrics(
           new UI.Size(orientation.width, orientation.height), insets, outline, this._scaleSetting.get(),
-          this._device.deviceScaleFactor, this._device.mobile(),
+          this._device.deviceScaleFactor, mobile,
           this._mode.orientation === Emulation.EmulatedDevice.Horizontal ? 'landscapePrimary' : 'portraitPrimary',
           resetPageScaleFactor);
       this._applyUserAgent(this._device.userAgent);
-      this._applyTouch(this._device.touch(), this._device.mobile());
+      this._applyTouch(this._device.touch(), mobile);
     } else if (this._type === Emulation.DeviceModeModel.Type.None) {
       this._fitScale = this._calculateFitScale(this._availableSize.width, this._availableSize.height);
       this._appliedUserAgentType = Emulation.DeviceModeModel.UA.Desktop;
       this._applyDeviceMetrics(
-          this._availableSize, new UI.Insets(0, 0, 0, 0), new UI.Insets(0, 0, 0, 0), 1, 0, false, '',
+          this._availableSize, new UI.Insets(0, 0, 0, 0), new UI.Insets(0, 0, 0, 0), 1, 0, mobile, '',
           resetPageScaleFactor);
       this._applyUserAgent('');
       this._applyTouch(false, false);
@@ -433,8 +450,6 @@ Emulation.DeviceModeModel = class {
       var screenHeight = this._heightSetting.get();
       if (!screenHeight || screenHeight > this._preferredScaledHeight())
         screenHeight = this._preferredScaledHeight();
-      var mobile = this._uaSetting.get() === Emulation.DeviceModeModel.UA.Mobile ||
-          this._uaSetting.get() === Emulation.DeviceModeModel.UA.MobileNoTouch;
       var defaultDeviceScaleFactor = mobile ? Emulation.DeviceModeModel.defaultMobileScaleFactor : 0;
       this._fitScale = this._calculateFitScale(this._widthSetting.get(), this._heightSetting.get());
       this._appliedUserAgentType = this._uaSetting.get();
@@ -524,6 +539,7 @@ Emulation.DeviceModeModel = class {
 
     var pageWidth = screenSize.width - insets.left - insets.right;
     var pageHeight = screenSize.height - insets.top - insets.bottom;
+    this._emulatedPageSize = new UI.Size(Math.floor(pageWidth * scale), Math.floor(pageHeight * scale));
 
     var positionX = insets.left;
     var positionY = insets.top;
@@ -597,6 +613,42 @@ Emulation.DeviceModeModel = class {
     }
   }
 
+  /**
+   * @param {function(?Protocol.Error, string) callback
+   */
+  captureFullHeightScreenshot(callback) {
+    this._target.pageAgent().getLayoutMetrics((err, layoutViewport, visualViewport, contentSize) => {
+      var promises = [];
+      var scaledPageSize =
+          new UI.Rect(0, 0, contentSize.width, contentSize.height).scale(visualViewport.scale * this._scale);
+      var params = {
+        width: 0,
+        height: 0,
+        deviceScaleFactor: this._appliedDeviceScaleFactor,
+        mobile: this._isMobile(),
+        fitWindow: false,
+        scale: this._scale,
+      };
+      promises.push(this._target.emulationAgent().forceViewport(0, 0, visualViewport.scale));

[dgozman, 2017/01/19 23:40:42]

I tried this out: with 150% scale in dropdown and manual scale (Shift+Drag), the
image is cropped. Now I think that we should ignore the viewport.scale entirely
and force 1.0 since we account for the whole content size anyway. WDYT?

+      promises.push(this._target.emulationAgent().invoke_setDeviceMetricsOverride(params));
+      promises.push(this._target.emulationAgent().setVisibleSize(scaledPageSize.width, scaledPageSize.height));

[dgozman, 2017/01/19 23:40:42]

You have to Math.floor() these to send integers.

+      Promise.all(promises).then(() => {
+        this._target.pageAgent().captureScreenshot(screenshotCaptured.bind(this));
+      });
+
+      /**
+       * @param {?Protocol.Error} error
+       * @param {string} content
+       * @this {Emulation.DeviceModeModel}
+       */
+      function screenshotCaptured(error, content) {
+        this._target.emulationAgent().setVisibleSize(this._emulatedPageSize.width, this._emulatedPageSize.height);
+        this._target.emulationAgent().resetViewport();
+        callback(error, content);
+      }
+    });
+  }
+
   _deviceMetricsOverrideAppliedForTest() {
     // Used for sniffing in tests.
   }