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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.gallery3d.photoeditor.actions;
     18 
     19 import android.content.Context;
     20 import android.graphics.Matrix;
     21 import android.graphics.PointF;
     22 import android.graphics.RectF;
     23 import android.util.AttributeSet;
     24 import android.view.View;
     25 
     26 /**
     27  * Full-screen tool view that gets photo display bounds and maps positions on photo display bounds
     28  * back to exact coordinates on photo.
     29  */
     30 abstract class FullscreenToolView extends View {
     31 
     32     protected final RectF displayBounds = new RectF();
     33     private final Matrix photoMatrix = new Matrix();
     34     private RectF photoBounds;
     35 
     36     public FullscreenToolView(Context context, AttributeSet attrs) {
     37         super(context, attrs);
     38     }
     39 
     40     /**
     41      * Photo bounds must be set before onSizeChanged() and all other instance methods are invoked.
     42      */
     43     public void setPhotoBounds(RectF photoBounds) {
     44         this.photoBounds = photoBounds;
     45     }
     46 
     47     @Override
     48     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
     49         super.onSizeChanged(w, h, oldw, oldh);
     50 
     51         displayBounds.setEmpty();
     52         photoMatrix.reset();
     53         if (photoBounds.isEmpty()) {
     54             return;
     55         }
     56 
     57         // Assumes photo-view is also full-screen as this tool-view and centers/scales photo to fit.
     58         Matrix matrix = new Matrix();
     59         if (matrix.setRectToRect(photoBounds, new RectF(0, 0, w, h), Matrix.ScaleToFit.CENTER)) {
     60             matrix.mapRect(displayBounds, photoBounds);
     61         }
     62 
     63         matrix.invert(photoMatrix);
     64     }
     65 
     66     protected float getPhotoWidth() {
     67         return photoBounds.width();
     68     }
     69 
     70     protected float getPhotoHeight() {
     71         return photoBounds.height();
     72     }
     73 
     74     protected void mapPhotoPoint(float x, float y, PointF dst) {
     75         if (photoBounds.isEmpty()) {
     76             dst.set(0, 0);
     77         } else {
     78             float[] point = new float[] {x, y};
     79             photoMatrix.mapPoints(point);
     80             dst.set(point[0] / photoBounds.width(), point[1] / photoBounds.height());
     81         }
     82     }
     83 
     84     protected void mapPhotoRect(RectF src, RectF dst) {
     85         if (photoBounds.isEmpty()) {
     86             dst.setEmpty();
     87         } else {
     88             photoMatrix.mapRect(dst, src);
     89             dst.set(dst.left / photoBounds.width(), dst.top / photoBounds.height(),
     90                     dst.right / photoBounds.width(), dst.bottom / photoBounds.height());
     91         }
     92     }
     93 }
     94