PdfManipulationService.java revision 62ce332c141cf7bc7200c4c87d63e395874fc3ec 
1/*
2 * Copyright (C) 2014 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
17package com.android.printspooler.renderer;
18
19import android.app.Service;
20import android.content.Intent;
21import android.content.res.Configuration;
22import android.graphics.Bitmap;
23import android.graphics.Color;
24import android.graphics.Matrix;
25import android.graphics.Rect;
26import android.graphics.pdf.PdfEditor;
27import android.graphics.pdf.PdfRenderer;
28import android.os.IBinder;
29import android.os.ParcelFileDescriptor;
30import android.os.RemoteException;
31import android.print.PageRange;
32import android.print.PrintAttributes;
33import android.print.PrintAttributes.Margins;
34import android.util.Log;
35import android.view.View;
36import com.android.printspooler.util.PageRangeUtils;
37import libcore.io.IoUtils;
38import com.android.printspooler.util.BitmapSerializeUtils;
39import java.io.IOException;
40
41/**
42 * Service for manipulation of PDF documents in an isolated process.
43 */
44public final class PdfManipulationService extends Service {
45    public static final String ACTION_GET_RENDERER =
46            "com.android.printspooler.renderer.ACTION_GET_RENDERER";
47    public static final String ACTION_GET_EDITOR =
48            "com.android.printspooler.renderer.ACTION_GET_EDITOR";
49
50    private static final String LOG_TAG = "PdfManipulationService";
51    private static final boolean DEBUG = false;
52
53    private static final int MILS_PER_INCH = 1000;
54    private static final int POINTS_IN_INCH = 72;
55
56    @Override
57    public IBinder onBind(Intent intent) {
58        String action = intent.getAction();
59        switch (action) {
60            case ACTION_GET_RENDERER: {
61                return new PdfRendererImpl();
62            }
63            case ACTION_GET_EDITOR: {
64                return new PdfEditorImpl();
65            }
66            default: {
67                throw new IllegalArgumentException("Invalid intent action:" + action);
68            }
69        }
70    }
71
72    private final class PdfRendererImpl extends IPdfRenderer.Stub {
73        private final Object mLock = new Object();
74
75        private Bitmap mBitmap;
76        private PdfRenderer mRenderer;
77
78        @Override
79        public int openDocument(ParcelFileDescriptor source) throws RemoteException {
80            synchronized (mLock) {
81                try {
82                    throwIfOpened();
83                    if (DEBUG) {
84                        Log.i(LOG_TAG, "openDocument()");
85                    }
86                    mRenderer = new PdfRenderer(source);
87                    return mRenderer.getPageCount();
88                } catch (IOException|IllegalStateException e) {
89                    IoUtils.closeQuietly(source);
90                    Log.e(LOG_TAG, "Cannot open file", e);
91                    throw new RemoteException(e.toString());
92                }
93            }
94        }
95
96        @Override
97        public void renderPage(int pageIndex, int bitmapWidth, int bitmapHeight,
98                PrintAttributes attributes, ParcelFileDescriptor destination) {
99            synchronized (mLock) {
100                try {
101                    throwIfNotOpened();
102
103                    PdfRenderer.Page page = mRenderer.openPage(pageIndex);
104
105                    final int srcWidthPts = page.getWidth();
106                    final int srcHeightPts = page.getHeight();
107
108                    final int dstWidthPts = pointsFromMils(
109                            attributes.getMediaSize().getWidthMils());
110                    final int dstHeightPts = pointsFromMils(
111                            attributes.getMediaSize().getHeightMils());
112
113                    final boolean scaleContent = mRenderer.shouldScaleForPrinting();
114                    final boolean contentLandscape = !attributes.getMediaSize().isPortrait();
115
116                    final float displayScale;
117                    Matrix matrix = new Matrix();
118
119                    if (scaleContent) {
120                        displayScale = Math.min((float) bitmapWidth / srcWidthPts,
121                                (float) bitmapHeight / srcHeightPts);
122                    } else {
123                        if (contentLandscape) {
124                            displayScale = (float) bitmapHeight / dstHeightPts;
125                        } else {
126                            displayScale = (float) bitmapWidth / dstWidthPts;
127                        }
128                    }
129                    matrix.postScale(displayScale, displayScale);
130
131                    Configuration configuration = PdfManipulationService.this.getResources()
132                            .getConfiguration();
133                    if (configuration.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
134                        matrix.postTranslate(bitmapWidth - srcWidthPts * displayScale, 0);
135                    }
136
137                    Margins minMargins = attributes.getMinMargins();
138                    final int paddingLeftPts = pointsFromMils(minMargins.getLeftMils());
139                    final int paddingTopPts = pointsFromMils(minMargins.getTopMils());
140                    final int paddingRightPts = pointsFromMils(minMargins.getRightMils());
141                    final int paddingBottomPts = pointsFromMils(minMargins.getBottomMils());
142
143                    Rect clip = new Rect();
144                    clip.left = (int) (paddingLeftPts * displayScale);
145                    clip.top = (int) (paddingTopPts * displayScale);
146                    clip.right = (int) (bitmapWidth - paddingRightPts * displayScale);
147                    clip.bottom = (int) (bitmapHeight - paddingBottomPts * displayScale);
148
149                    if (DEBUG) {
150                        Log.i(LOG_TAG, "Rendering page:" + pageIndex);
151                    }
152
153                    Bitmap bitmap = getBitmapForSize(bitmapWidth, bitmapHeight);
154                    page.render(bitmap, clip, matrix, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
155
156                    page.close();
157
158                    BitmapSerializeUtils.writeBitmapPixels(bitmap, destination);
159                } finally {
160                    IoUtils.closeQuietly(destination);
161                }
162            }
163        }
164
165        @Override
166        public void closeDocument() {
167            synchronized (mLock) {
168                throwIfNotOpened();
169                if (DEBUG) {
170                    Log.i(LOG_TAG, "closeDocument()");
171                }
172                mRenderer.close();
173                mRenderer = null;
174            }
175        }
176
177        private Bitmap getBitmapForSize(int width, int height) {
178            if (mBitmap != null) {
179                if (mBitmap.getWidth() == width && mBitmap.getHeight() == height) {
180                    mBitmap.eraseColor(Color.WHITE);
181                    return mBitmap;
182                }
183                mBitmap.recycle();
184            }
185            mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
186            mBitmap.eraseColor(Color.WHITE);
187            return mBitmap;
188        }
189
190        private void throwIfOpened() {
191            if (mRenderer != null) {
192                throw new IllegalStateException("Already opened");
193            }
194        }
195
196        private void throwIfNotOpened() {
197            if (mRenderer == null) {
198                throw new IllegalStateException("Not opened");
199            }
200        }
201    }
202
203    private final class PdfEditorImpl extends IPdfEditor.Stub {
204        private final Object mLock = new Object();
205
206        private PdfEditor mEditor;
207
208        @Override
209        public int openDocument(ParcelFileDescriptor source) throws RemoteException {
210            synchronized (mLock) {
211                try {
212                    throwIfOpened();
213                    if (DEBUG) {
214                        Log.i(LOG_TAG, "openDocument()");
215                    }
216                    mEditor = new PdfEditor(source);
217                    return mEditor.getPageCount();
218                } catch (IOException|IllegalStateException e) {
219                    IoUtils.closeQuietly(source);
220                    Log.e(LOG_TAG, "Cannot open file", e);
221                    throw new RemoteException(e.toString());
222                }
223            }
224        }
225
226        @Override
227        public void removePages(PageRange[] ranges) {
228            synchronized (mLock) {
229                throwIfNotOpened();
230                if (DEBUG) {
231                    Log.i(LOG_TAG, "removePages()");
232                }
233
234                ranges = PageRangeUtils.normalize(ranges);
235
236                final int rangeCount = ranges.length;
237                for (int i = rangeCount - 1; i >= 0; i--) {
238                    PageRange range = ranges[i];
239                    for (int j = range.getEnd(); j >= range.getStart(); j--) {
240                        mEditor.removePage(j);
241                    }
242                }
243            }
244        }
245
246        @Override
247        public void write(ParcelFileDescriptor destination) throws RemoteException {
248            synchronized (mLock) {
249                try {
250                    throwIfNotOpened();
251                    if (DEBUG) {
252                        Log.i(LOG_TAG, "write()");
253                    }
254                    mEditor.write(destination);
255                } catch (IOException | IllegalStateException e) {
256                    IoUtils.closeQuietly(destination);
257                    Log.e(LOG_TAG, "Error writing PDF to file.", e);
258                    throw new RemoteException(e.toString());
259                }
260            }
261        }
262
263        @Override
264        public void closeDocument() {
265            synchronized (mLock) {
266                throwIfNotOpened();
267                if (DEBUG) {
268                    Log.i(LOG_TAG, "closeDocument()");
269                }
270                mEditor.close();
271                mEditor = null;
272            }
273        }
274
275        private void throwIfOpened() {
276            if (mEditor != null) {
277                throw new IllegalStateException("Already opened");
278            }
279        }
280
281        private void throwIfNotOpened() {
282            if (mEditor == null) {
283                throw new IllegalStateException("Not opened");
284            }
285        }
286    }
287
288    private static int pointsFromMils(int mils) {
289        return (int) (((float) mils / MILS_PER_INCH) * POINTS_IN_INCH);
290    }
291}
292