src/com/android/camera/CaptureLayoutHelper.java - platform/packages/apps/Camera2 - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.camera;

 import android.content.Context;
 import android.graphics.Matrix;
 import android.graphics.RectF;

 import com.android.camera.app.CameraApp;
 import com.android.camera.app.CameraAppUI;
 import com.android.camera.ui.PreviewStatusListener;
 import com.android.camera2.R;

 /**
  * This class centralizes the logic of how bottom bar should be laid out and how
  * preview should be transformed. The two things that could affect bottom bar layout
  * and preview transform are: window size and preview aspect ratio. Once these two
  * things are set, the layout of bottom bar and preview rect will be calculated
  * and can then be queried anywhere inside the app.
  *
  * Note that this helper assumes that preview TextureView will be laid out full
  * screen, meaning all its ascendants are laid out with MATCH_PARENT flags. If
  * or when this assumption is no longer the case, we need to revisit this logic.
  */
 public class CaptureLayoutHelper implements CameraAppUI.NonDecorWindowSizeChangedListener,
         PreviewStatusListener.PreviewAspectRatioChangedListener {

     private final int mBottomBarMinHeight;
     private final int mBottomBarMaxHeight;
     private final int mBottomBarOptimalHeight;

     private int mWindowWidth = 0;
     private int mWindowHeight = 0;
     /** Aspect ratio of preview. It could be 0, meaning match the screen aspect ratio,
      * or a float value no less than 1f.
      */
     private float mAspectRatio = TextureViewHelper.MATCH_SCREEN;
     private PositionConfiguration mPositionConfiguration = null;
     private int mRotation = 0;
     private boolean mShowBottomBar = true;

     /**
      * PositionConfiguration contains the layout info for bottom bar and preview
      * rect, as well as whether bottom bar should be overlaid on top of preview.
      */
     public static final class PositionConfiguration {
         /**
          * This specifies the rect of preview on screen.
          */
         public final RectF mPreviewRect = new RectF();
         /**
          * This specifies the rect where bottom bar should be laid out in.
          */
         public final RectF mBottomBarRect = new RectF();
         /**
          * This indicates whether bottom bar should overlay itself on top of preview.
          */
         public boolean mBottomBarOverlay = false;
     }

     public CaptureLayoutHelper(int bottomBarMinHeight, int bottomBarMaxHeight,
             int bottomBarOptimalHeight) {
         mBottomBarMinHeight = bottomBarMinHeight;
         mBottomBarMaxHeight = bottomBarMaxHeight;
         mBottomBarOptimalHeight = bottomBarOptimalHeight;
     }

     @Override
     public void onPreviewAspectRatioChanged(float aspectRatio) {
         if (mAspectRatio == aspectRatio) {
             return;
         }
         mAspectRatio = aspectRatio;
         updatePositionConfiguration();
     }

     /**
      * Sets whether bottom bar will show or not. This will affect the calculation
      * of uncovered preview area, which is used to lay out mode list, mode options,
      * etc.
      */
     public void setShowBottomBar(boolean showBottomBar) {
         mShowBottomBar = showBottomBar;
     }

     /**
      * Updates bottom bar rect and preview rect. This gets called whenever
      * preview aspect ratio changes or main activity layout size changes.
      */
     private void updatePositionConfiguration() {
         if (mWindowWidth == 0 || mWindowHeight == 0) {
             return;
         }
         mPositionConfiguration = getPositionConfiguration(mWindowWidth, mWindowHeight, mAspectRatio,
                 mRotation);
     }

     /**
      * Returns the rect that bottom bar should be laid out in. If not enough info
      * has been provided to calculate this, return an empty rect. Note that the rect
      * returned is relative to the content layout of the activity. It may need to be
      * translated based on the parent view's location.
      */
     public RectF getBottomBarRect() {
         if (mPositionConfiguration == null) {
             updatePositionConfiguration();
         }
         // Not enough info to create a position configuration.
         if (mPositionConfiguration == null) {
             return new RectF();
         }
         return new RectF(mPositionConfiguration.mBottomBarRect);
     }

     /**
      * Returns the rect that preview should occupy based on aspect ratio. If not
      * enough info has been provided to calculate this, return an empty rect. Note
      * that the rect returned is relative to the content layout of the activity.
      * It may need to be translated based on the parent view's location.
      */
     public RectF getPreviewRect() {
         if (mPositionConfiguration == null) {
             updatePositionConfiguration();
         }
         // Not enough info to create a position configuration.
         if (mPositionConfiguration == null) {
             return new RectF();
         }
         return new RectF(mPositionConfiguration.mPreviewRect);
     }

     /**
      * This returns the rect that is available to display the preview, and
      * capture buttons
      *
      * @return the rect.
      */
     public RectF getFullscreenRect() {
         return new RectF(0, 0, mWindowWidth, mWindowHeight);
     }

     /**
      * Returns the sub-rect of the preview that is not being blocked by the
      * bottom bar. This can be used to lay out mode options, settings button,
      * etc. If not enough info has been provided to calculate this, return an
      * empty rect. Note that the rect returned is relative to the content layout
      * of the activity. It may need to be translated based on the parent view's
      * location.
      */
     public RectF getUncoveredPreviewRect() {
         if (mPositionConfiguration == null) {
             updatePositionConfiguration();
         }
         // Not enough info to create a position configuration.
         if (mPositionConfiguration == null) {
             return new RectF();
         }

         if (!RectF.intersects(mPositionConfiguration.mBottomBarRect,
                 mPositionConfiguration.mPreviewRect) || !mShowBottomBar) {
             return mPositionConfiguration.mPreviewRect;
         }

         if (mWindowHeight > mWindowWidth) {
             // Portrait.
             if (mRotation >= 180) {
                 // Reverse portrait, bottom bar align top.
                 return new RectF(mPositionConfiguration.mPreviewRect.left,
                         mPositionConfiguration.mBottomBarRect.bottom,
                         mPositionConfiguration.mPreviewRect.right,
                         mPositionConfiguration.mPreviewRect.bottom);
             } else {
                 return new RectF(mPositionConfiguration.mPreviewRect.left,
                         mPositionConfiguration.mPreviewRect.top,
                         mPositionConfiguration.mPreviewRect.right,
                         mPositionConfiguration.mBottomBarRect.top);
             }
         } else {
             if (mRotation >= 180) {
                 // Reverse landscape, bottom bar align left.
                 return new RectF(mPositionConfiguration.mBottomBarRect.right,
                         mPositionConfiguration.mPreviewRect.top,
                         mPositionConfiguration.mPreviewRect.right,
                         mPositionConfiguration.mPreviewRect.bottom);
             } else {
                 return new RectF(mPositionConfiguration.mPreviewRect.left,
                         mPositionConfiguration.mPreviewRect.top,
                         mPositionConfiguration.mBottomBarRect.left,
                         mPositionConfiguration.mPreviewRect.bottom);
             }
         }
     }

     /**
      * Returns whether the bottom bar should be transparent and overlaid on top
      * of the preview.
      */
     public boolean shouldOverlayBottomBar() {
         if (mPositionConfiguration == null) {
             updatePositionConfiguration();
         }
         // Not enough info to create a position configuration.
         if (mPositionConfiguration == null) {
             return false;
         }
         return mPositionConfiguration.mBottomBarOverlay;
     }

     @Override
     public void onNonDecorWindowSizeChanged(int width, int height, int rotation) {
         mWindowWidth = width;
         mWindowHeight = height;
         mRotation = rotation;
         updatePositionConfiguration();
     }

     /**
      * Calculates the layout rect of bottom bar and the size of preview based on
      * activity layout width, height and aspect ratio.
      *
      * @param width width of the main activity layout, excluding system decor such
      *              as status bar, nav bar, etc.
      * @param height height of the main activity layout, excluding system decor
      *               such as status bar, nav bar, etc.
      * @param previewAspectRatio aspect ratio of the preview
      * @param rotation rotation from the natural orientation
      * @return a custom position configuration that contains bottom bar rect,
      *         preview rect and whether bottom bar should be overlaid.
      */
     private PositionConfiguration getPositionConfiguration(int width, int height,
             float previewAspectRatio, int rotation) {
         boolean landscape = width > height;

         // If the aspect ratio is defined as fill the screen, then preview should
         // take the screen rect.
         PositionConfiguration config = new PositionConfiguration();
         if (previewAspectRatio == TextureViewHelper.MATCH_SCREEN) {
             config.mPreviewRect.set(0, 0, width, height);
             config.mBottomBarOverlay = true;
             if (landscape) {
                 config.mBottomBarRect.set(width - mBottomBarOptimalHeight, 0, width, height);
             } else {
                 config.mBottomBarRect.set(0, height - mBottomBarOptimalHeight, width, height);
             }
         } else {
             if (previewAspectRatio < 1) {
                 previewAspectRatio = 1 / previewAspectRatio;
             }
             // Get the bottom bar width and height.
             float barSize;
             int longerEdge = Math.max(width, height);
             int shorterEdge = Math.min(width, height);

             // Check the remaining space if fit short edge.
             float spaceNeededAlongLongerEdge = shorterEdge * previewAspectRatio;
             float remainingSpaceAlongLongerEdge = longerEdge - spaceNeededAlongLongerEdge;

             float previewShorterEdge;
             float previewLongerEdge;
             if (remainingSpaceAlongLongerEdge <= 0) {
                 // Preview aspect ratio > screen aspect ratio: fit longer edge.
                 previewLongerEdge = longerEdge;
                 previewShorterEdge = longerEdge / previewAspectRatio;
                 barSize = mBottomBarOptimalHeight;
                 config.mBottomBarOverlay = true;

                 if (landscape) {
                     config.mPreviewRect.set(0, height / 2 - previewShorterEdge / 2, previewLongerEdge,
                             height / 2 + previewShorterEdge / 2);
                     config.mBottomBarRect.set(width - barSize, height / 2 - previewShorterEdge / 2,
                             width, height / 2 + previewShorterEdge / 2);
                 } else {
                     config.mPreviewRect.set(width / 2 - previewShorterEdge / 2, 0,
                             width / 2 + previewShorterEdge / 2, previewLongerEdge);
                     config.mBottomBarRect.set(width / 2 - previewShorterEdge / 2, height - barSize,
                             width / 2 + previewShorterEdge / 2, height);
                 }
             } else if (previewAspectRatio > 14f / 9f) {
                 // If the preview aspect ratio is large enough, simply offset the
                 // preview to the bottom/right.
                 // TODO: This logic needs some refinement.
                 barSize = mBottomBarOptimalHeight;
                 previewShorterEdge = shorterEdge;
                 previewLongerEdge = shorterEdge * previewAspectRatio;
                 config.mBottomBarOverlay = true;
                 if (landscape) {
                     float right = width;
                     float left = right - previewLongerEdge;
                     config.mPreviewRect.set(left, 0, right, previewShorterEdge);
                     config.mBottomBarRect.set(width - barSize, 0, width, height);
                 } else {
                     float bottom = height;
                     float top = bottom - previewLongerEdge;
                     config.mPreviewRect.set(0, top, previewShorterEdge, bottom);
                     config.mBottomBarRect.set(0, height - barSize, width, height);
                 }
             } else if (remainingSpaceAlongLongerEdge <= mBottomBarMinHeight) {
                 // Need to scale down the preview to fit in the space excluding the bottom bar.
                 previewLongerEdge = longerEdge - mBottomBarMinHeight;
                 previewShorterEdge = previewLongerEdge / previewAspectRatio;
                 barSize = mBottomBarMinHeight;
                 config.mBottomBarOverlay = false;
                 if (landscape) {
                     config.mPreviewRect.set(0, height / 2 - previewShorterEdge / 2, previewLongerEdge,
                             height / 2 + previewShorterEdge / 2);
                     config.mBottomBarRect.set(width - barSize, height / 2 - previewShorterEdge / 2,
                             width, height / 2 + previewShorterEdge / 2);
                 } else {
                     config.mPreviewRect.set(width / 2 - previewShorterEdge / 2, 0,
                             width / 2 + previewShorterEdge / 2, previewLongerEdge);
                     config.mBottomBarRect.set(width / 2 - previewShorterEdge / 2, height - barSize,
                             width / 2 + previewShorterEdge / 2, height);
                 }
             } else {
                 // Fit shorter edge.
                 barSize = remainingSpaceAlongLongerEdge <= mBottomBarMaxHeight ?
                         remainingSpaceAlongLongerEdge : mBottomBarMaxHeight;
                 previewShorterEdge = shorterEdge;
                 previewLongerEdge = shorterEdge * previewAspectRatio;
                 config.mBottomBarOverlay = false;
                 if (landscape) {
                     float right = width - barSize;
                     float left = right - previewLongerEdge;
                     config.mPreviewRect.set(left, 0, right, previewShorterEdge);
                     config.mBottomBarRect.set(width - barSize, 0, width, height);
                 } else {
                     float bottom = height - barSize;
                     float top = bottom - previewLongerEdge;
                     config.mPreviewRect.set(0, top, previewShorterEdge, bottom);
                     config.mBottomBarRect.set(0, height - barSize, width, height);
                 }
             }
         }

         if (rotation >= 180) {
             // Rotate 180 degrees.
             Matrix rotate = new Matrix();
             rotate.setRotate(180, width / 2, height / 2);

             rotate.mapRect(config.mPreviewRect);
             rotate.mapRect(config.mBottomBarRect);
         }

         // Round the rect first to avoid rounding errors later on.
         round(config.mBottomBarRect);
         round(config.mPreviewRect);

         return config;
     }

     /**
      * Round the float coordinates in the given rect, and store the rounded value
      * back in the rect.
      */
     public static void round(RectF rect) {
         if (rect == null) {
             return;
         }
         float left = Math.round(rect.left);
         float top = Math.round(rect.top);
         float right = Math.round(rect.right);
         float bottom = Math.round(rect.bottom);
         rect.set(left, top, right, bottom);
     }
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.camera;

	import android.content.Context;
	import android.graphics.Matrix;
	import android.graphics.RectF;

	import com.android.camera.app.CameraApp;
	import com.android.camera.app.CameraAppUI;
	import com.android.camera.ui.PreviewStatusListener;
	import com.android.camera2.R;

	/**
	* This class centralizes the logic of how bottom bar should be laid out and how
	* preview should be transformed. The two things that could affect bottom bar layout
	* and preview transform are: window size and preview aspect ratio. Once these two
	* things are set, the layout of bottom bar and preview rect will be calculated
	* and can then be queried anywhere inside the app.
	*
	* Note that this helper assumes that preview TextureView will be laid out full
	* screen, meaning all its ascendants are laid out with MATCH_PARENT flags. If
	* or when this assumption is no longer the case, we need to revisit this logic.
	*/
	public class CaptureLayoutHelper implements CameraAppUI.NonDecorWindowSizeChangedListener,
	PreviewStatusListener.PreviewAspectRatioChangedListener {

	private final int mBottomBarMinHeight;
	private final int mBottomBarMaxHeight;
	private final int mBottomBarOptimalHeight;

	private int mWindowWidth = 0;
	private int mWindowHeight = 0;
	/** Aspect ratio of preview. It could be 0, meaning match the screen aspect ratio,
	* or a float value no less than 1f.
	*/
	private float mAspectRatio = TextureViewHelper.MATCH_SCREEN;
	private PositionConfiguration mPositionConfiguration = null;
	private int mRotation = 0;
	private boolean mShowBottomBar = true;

	/**
	* PositionConfiguration contains the layout info for bottom bar and preview
	* rect, as well as whether bottom bar should be overlaid on top of preview.
	*/
	public static final class PositionConfiguration {
	/**
	* This specifies the rect of preview on screen.
	*/
	public final RectF mPreviewRect = new RectF();
	/**
	* This specifies the rect where bottom bar should be laid out in.
	*/
	public final RectF mBottomBarRect = new RectF();
	/**
	* This indicates whether bottom bar should overlay itself on top of preview.
	*/
	public boolean mBottomBarOverlay = false;
	}

	public CaptureLayoutHelper(int bottomBarMinHeight, int bottomBarMaxHeight,
	int bottomBarOptimalHeight) {
	mBottomBarMinHeight = bottomBarMinHeight;
	mBottomBarMaxHeight = bottomBarMaxHeight;
	mBottomBarOptimalHeight = bottomBarOptimalHeight;
	}

	@Override
	public void onPreviewAspectRatioChanged(float aspectRatio) {
	if (mAspectRatio == aspectRatio) {
	return;
	}
	mAspectRatio = aspectRatio;
	updatePositionConfiguration();
	}

	/**
	* Sets whether bottom bar will show or not. This will affect the calculation
	* of uncovered preview area, which is used to lay out mode list, mode options,
	* etc.
	*/
	public void setShowBottomBar(boolean showBottomBar) {
	mShowBottomBar = showBottomBar;
	}

	/**
	* Updates bottom bar rect and preview rect. This gets called whenever
	* preview aspect ratio changes or main activity layout size changes.
	*/
	private void updatePositionConfiguration() {
	if (mWindowWidth == 0 \|\| mWindowHeight == 0) {
	return;
	}
	mPositionConfiguration = getPositionConfiguration(mWindowWidth, mWindowHeight, mAspectRatio,
	mRotation);
	}

	/**
	* Returns the rect that bottom bar should be laid out in. If not enough info
	* has been provided to calculate this, return an empty rect. Note that the rect
	* returned is relative to the content layout of the activity. It may need to be
	* translated based on the parent view's location.
	*/
	public RectF getBottomBarRect() {
	if (mPositionConfiguration == null) {
	updatePositionConfiguration();
	}
	// Not enough info to create a position configuration.
	if (mPositionConfiguration == null) {
	return new RectF();
	}
	return new RectF(mPositionConfiguration.mBottomBarRect);
	}

	/**
	* Returns the rect that preview should occupy based on aspect ratio. If not
	* enough info has been provided to calculate this, return an empty rect. Note
	* that the rect returned is relative to the content layout of the activity.
	* It may need to be translated based on the parent view's location.
	*/
	public RectF getPreviewRect() {
	if (mPositionConfiguration == null) {
	updatePositionConfiguration();
	}
	// Not enough info to create a position configuration.
	if (mPositionConfiguration == null) {
	return new RectF();
	}
	return new RectF(mPositionConfiguration.mPreviewRect);
	}

	/**
	* This returns the rect that is available to display the preview, and
	* capture buttons
	*
	* @return the rect.
	*/
	public RectF getFullscreenRect() {
	return new RectF(0, 0, mWindowWidth, mWindowHeight);
	}

	/**
	* Returns the sub-rect of the preview that is not being blocked by the
	* bottom bar. This can be used to lay out mode options, settings button,
	* etc. If not enough info has been provided to calculate this, return an
	* empty rect. Note that the rect returned is relative to the content layout
	* of the activity. It may need to be translated based on the parent view's
	* location.
	*/
	public RectF getUncoveredPreviewRect() {
	if (mPositionConfiguration == null) {
	updatePositionConfiguration();
	}
	// Not enough info to create a position configuration.
	if (mPositionConfiguration == null) {
	return new RectF();
	}

	if (!RectF.intersects(mPositionConfiguration.mBottomBarRect,
	mPositionConfiguration.mPreviewRect) \|\| !mShowBottomBar) {
	return mPositionConfiguration.mPreviewRect;
	}

	if (mWindowHeight > mWindowWidth) {
	// Portrait.
	if (mRotation >= 180) {
	// Reverse portrait, bottom bar align top.
	return new RectF(mPositionConfiguration.mPreviewRect.left,
	mPositionConfiguration.mBottomBarRect.bottom,
	mPositionConfiguration.mPreviewRect.right,
	mPositionConfiguration.mPreviewRect.bottom);
	} else {
	return new RectF(mPositionConfiguration.mPreviewRect.left,
	mPositionConfiguration.mPreviewRect.top,
	mPositionConfiguration.mPreviewRect.right,
	mPositionConfiguration.mBottomBarRect.top);
	}
	} else {
	if (mRotation >= 180) {
	// Reverse landscape, bottom bar align left.
	return new RectF(mPositionConfiguration.mBottomBarRect.right,
	mPositionConfiguration.mPreviewRect.top,
	mPositionConfiguration.mPreviewRect.right,
	mPositionConfiguration.mPreviewRect.bottom);
	} else {
	return new RectF(mPositionConfiguration.mPreviewRect.left,
	mPositionConfiguration.mPreviewRect.top,
	mPositionConfiguration.mBottomBarRect.left,
	mPositionConfiguration.mPreviewRect.bottom);
	}
	}
	}

	/**
	* Returns whether the bottom bar should be transparent and overlaid on top
	* of the preview.
	*/
	public boolean shouldOverlayBottomBar() {
	if (mPositionConfiguration == null) {
	updatePositionConfiguration();
	}
	// Not enough info to create a position configuration.
	if (mPositionConfiguration == null) {
	return false;
	}
	return mPositionConfiguration.mBottomBarOverlay;
	}

	@Override
	public void onNonDecorWindowSizeChanged(int width, int height, int rotation) {
	mWindowWidth = width;
	mWindowHeight = height;
	mRotation = rotation;
	updatePositionConfiguration();
	}

	/**
	* Calculates the layout rect of bottom bar and the size of preview based on
	* activity layout width, height and aspect ratio.
	*
	* @param width width of the main activity layout, excluding system decor such
	* as status bar, nav bar, etc.
	* @param height height of the main activity layout, excluding system decor
	* such as status bar, nav bar, etc.
	* @param previewAspectRatio aspect ratio of the preview
	* @param rotation rotation from the natural orientation
	* @return a custom position configuration that contains bottom bar rect,
	* preview rect and whether bottom bar should be overlaid.
	*/
	private PositionConfiguration getPositionConfiguration(int width, int height,
	float previewAspectRatio, int rotation) {
	boolean landscape = width > height;

	// If the aspect ratio is defined as fill the screen, then preview should
	// take the screen rect.
	PositionConfiguration config = new PositionConfiguration();
	if (previewAspectRatio == TextureViewHelper.MATCH_SCREEN) {
	config.mPreviewRect.set(0, 0, width, height);
	config.mBottomBarOverlay = true;
	if (landscape) {
	config.mBottomBarRect.set(width - mBottomBarOptimalHeight, 0, width, height);
	} else {
	config.mBottomBarRect.set(0, height - mBottomBarOptimalHeight, width, height);
	}
	} else {
	if (previewAspectRatio < 1) {
	previewAspectRatio = 1 / previewAspectRatio;
	}
	// Get the bottom bar width and height.
	float barSize;
	int longerEdge = Math.max(width, height);
	int shorterEdge = Math.min(width, height);

	// Check the remaining space if fit short edge.
	float spaceNeededAlongLongerEdge = shorterEdge * previewAspectRatio;
	float remainingSpaceAlongLongerEdge = longerEdge - spaceNeededAlongLongerEdge;

	float previewShorterEdge;
	float previewLongerEdge;
	if (remainingSpaceAlongLongerEdge <= 0) {
	// Preview aspect ratio > screen aspect ratio: fit longer edge.
	previewLongerEdge = longerEdge;
	previewShorterEdge = longerEdge / previewAspectRatio;
	barSize = mBottomBarOptimalHeight;
	config.mBottomBarOverlay = true;

	if (landscape) {
	config.mPreviewRect.set(0, height / 2 - previewShorterEdge / 2, previewLongerEdge,
	height / 2 + previewShorterEdge / 2);
	config.mBottomBarRect.set(width - barSize, height / 2 - previewShorterEdge / 2,
	width, height / 2 + previewShorterEdge / 2);
	} else {
	config.mPreviewRect.set(width / 2 - previewShorterEdge / 2, 0,
	width / 2 + previewShorterEdge / 2, previewLongerEdge);
	config.mBottomBarRect.set(width / 2 - previewShorterEdge / 2, height - barSize,
	width / 2 + previewShorterEdge / 2, height);
	}
	} else if (previewAspectRatio > 14f / 9f) {
	// If the preview aspect ratio is large enough, simply offset the
	// preview to the bottom/right.
	// TODO: This logic needs some refinement.
	barSize = mBottomBarOptimalHeight;
	previewShorterEdge = shorterEdge;
	previewLongerEdge = shorterEdge * previewAspectRatio;
	config.mBottomBarOverlay = true;
	if (landscape) {
	float right = width;
	float left = right - previewLongerEdge;
	config.mPreviewRect.set(left, 0, right, previewShorterEdge);
	config.mBottomBarRect.set(width - barSize, 0, width, height);
	} else {
	float bottom = height;
	float top = bottom - previewLongerEdge;
	config.mPreviewRect.set(0, top, previewShorterEdge, bottom);
	config.mBottomBarRect.set(0, height - barSize, width, height);
	}
	} else if (remainingSpaceAlongLongerEdge <= mBottomBarMinHeight) {
	// Need to scale down the preview to fit in the space excluding the bottom bar.
	previewLongerEdge = longerEdge - mBottomBarMinHeight;
	previewShorterEdge = previewLongerEdge / previewAspectRatio;
	barSize = mBottomBarMinHeight;
	config.mBottomBarOverlay = false;
	if (landscape) {
	config.mPreviewRect.set(0, height / 2 - previewShorterEdge / 2, previewLongerEdge,
	height / 2 + previewShorterEdge / 2);
	config.mBottomBarRect.set(width - barSize, height / 2 - previewShorterEdge / 2,
	width, height / 2 + previewShorterEdge / 2);
	} else {
	config.mPreviewRect.set(width / 2 - previewShorterEdge / 2, 0,
	width / 2 + previewShorterEdge / 2, previewLongerEdge);
	config.mBottomBarRect.set(width / 2 - previewShorterEdge / 2, height - barSize,
	width / 2 + previewShorterEdge / 2, height);
	}
	} else {
	// Fit shorter edge.
	barSize = remainingSpaceAlongLongerEdge <= mBottomBarMaxHeight ?
	remainingSpaceAlongLongerEdge : mBottomBarMaxHeight;
	previewShorterEdge = shorterEdge;
	previewLongerEdge = shorterEdge * previewAspectRatio;
	config.mBottomBarOverlay = false;
	if (landscape) {
	float right = width - barSize;
	float left = right - previewLongerEdge;
	config.mPreviewRect.set(left, 0, right, previewShorterEdge);
	config.mBottomBarRect.set(width - barSize, 0, width, height);
	} else {
	float bottom = height - barSize;
	float top = bottom - previewLongerEdge;
	config.mPreviewRect.set(0, top, previewShorterEdge, bottom);
	config.mBottomBarRect.set(0, height - barSize, width, height);
	}
	}
	}

	if (rotation >= 180) {
	// Rotate 180 degrees.
	Matrix rotate = new Matrix();
	rotate.setRotate(180, width / 2, height / 2);

	rotate.mapRect(config.mPreviewRect);
	rotate.mapRect(config.mBottomBarRect);
	}

	// Round the rect first to avoid rounding errors later on.
	round(config.mBottomBarRect);
	round(config.mPreviewRect);

	return config;
	}

	/**
	* Round the float coordinates in the given rect, and store the rounded value
	* back in the rect.
	*/
	public static void round(RectF rect) {
	if (rect == null) {
	return;
	}
	float left = Math.round(rect.left);
	float top = Math.round(rect.top);
	float right = Math.round(rect.right);
	float bottom = Math.round(rect.bottom);
	rect.set(left, top, right, bottom);
	}
	}