BitmapRegionDecoder.cpp revision 3b47713b26859f83c0cf7adede8e8090097673ad 
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#define LOG_TAG "BitmapRegionDecoder"
18
19#include "SkBitmap.h"
20#include "SkData.h"
21#include "SkImageEncoder.h"
22#include "GraphicsJNI.h"
23#include "SkUtils.h"
24#include "SkTemplates.h"
25#include "SkPixelRef.h"
26#include "SkStream.h"
27#include "BitmapFactory.h"
28#include "AutoDecodeCancel.h"
29#include "CreateJavaOutputStreamAdaptor.h"
30#include "Utils.h"
31#include "JNIHelp.h"
32
33#include <android_runtime/AndroidRuntime.h>
34#include "android_util_Binder.h"
35#include "android_nio_utils.h"
36#include "CreateJavaOutputStreamAdaptor.h"
37
38#include <binder/Parcel.h>
39#include <jni.h>
40#include <androidfw/Asset.h>
41#include <sys/stat.h>
42
43#if 0
44    #define TRACE_BITMAP(code)  code
45#else
46    #define TRACE_BITMAP(code)
47#endif
48
49using namespace android;
50
51class SkBitmapRegionDecoder {
52public:
53    SkBitmapRegionDecoder(SkImageDecoder* decoder, int width, int height) {
54        fDecoder = decoder;
55        fWidth = width;
56        fHeight = height;
57    }
58    ~SkBitmapRegionDecoder() {
59        SkDELETE(fDecoder);
60    }
61
62    bool decodeRegion(SkBitmap* bitmap, const SkIRect& rect,
63                      SkColorType pref, int sampleSize) {
64        fDecoder->setSampleSize(sampleSize);
65        return fDecoder->decodeSubset(bitmap, rect, pref);
66    }
67
68    SkImageDecoder* getDecoder() const { return fDecoder; }
69    int getWidth() const { return fWidth; }
70    int getHeight() const { return fHeight; }
71
72private:
73    SkImageDecoder* fDecoder;
74    int fWidth;
75    int fHeight;
76};
77
78static jobject createBitmapRegionDecoder(JNIEnv* env, SkStreamRewindable* stream) {
79    SkImageDecoder* decoder = SkImageDecoder::Factory(stream);
80    int width, height;
81    if (NULL == decoder) {
82        doThrowIOE(env, "Image format not supported");
83        return nullObjectReturn("SkImageDecoder::Factory returned null");
84    }
85
86    JavaPixelAllocator *javaAllocator = new JavaPixelAllocator(env);
87    decoder->setAllocator(javaAllocator);
88    javaAllocator->unref();
89
90    if (!decoder->buildTileIndex(stream, &width, &height)) {
91        char msg[100];
92        snprintf(msg, sizeof(msg), "Image failed to decode using %s decoder",
93                decoder->getFormatName());
94        doThrowIOE(env, msg);
95        SkDELETE(decoder);
96        return nullObjectReturn("decoder->buildTileIndex returned false");
97    }
98
99    SkBitmapRegionDecoder *bm = new SkBitmapRegionDecoder(decoder, width, height);
100    return GraphicsJNI::createBitmapRegionDecoder(env, bm);
101}
102
103static jobject nativeNewInstanceFromByteArray(JNIEnv* env, jobject, jbyteArray byteArray,
104                                     jint offset, jint length, jboolean isShareable) {
105    /*  If isShareable we could decide to just wrap the java array and
106        share it, but that means adding a globalref to the java array object
107        For now we just always copy the array's data if isShareable.
108     */
109    AutoJavaByteArray ar(env, byteArray);
110    SkMemoryStream* stream = new SkMemoryStream(ar.ptr() + offset, length, true);
111
112    jobject brd = createBitmapRegionDecoder(env, stream);
113    SkSafeUnref(stream); // the decoder now holds a reference
114    return brd;
115}
116
117static jobject nativeNewInstanceFromFileDescriptor(JNIEnv* env, jobject clazz,
118                                          jobject fileDescriptor, jboolean isShareable) {
119    NPE_CHECK_RETURN_ZERO(env, fileDescriptor);
120
121    jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
122
123    struct stat fdStat;
124    if (fstat(descriptor, &fdStat) == -1) {
125        doThrowIOE(env, "broken file descriptor");
126        return nullObjectReturn("fstat return -1");
127    }
128
129    SkAutoTUnref<SkData> data(SkData::NewFromFD(descriptor));
130    SkMemoryStream* stream = new SkMemoryStream(data);
131
132    jobject brd = createBitmapRegionDecoder(env, stream);
133    SkSafeUnref(stream); // the decoder now holds a reference
134    return brd;
135}
136
137static jobject nativeNewInstanceFromStream(JNIEnv* env, jobject clazz,
138                                  jobject is,       // InputStream
139                                  jbyteArray storage, // byte[]
140                                  jboolean isShareable) {
141    jobject brd = NULL;
142    // for now we don't allow shareable with java inputstreams
143    SkStreamRewindable* stream = CopyJavaInputStream(env, is, storage);
144
145    if (stream) {
146        brd = createBitmapRegionDecoder(env, stream);
147        stream->unref(); // the decoder now holds a reference
148    }
149    return brd;
150}
151
152static jobject nativeNewInstanceFromAsset(JNIEnv* env, jobject clazz,
153                                 jlong native_asset, // Asset
154                                 jboolean isShareable) {
155    Asset* asset = reinterpret_cast<Asset*>(native_asset);
156    SkAutoTUnref<SkMemoryStream> stream(CopyAssetToStream(asset));
157    if (NULL == stream.get()) {
158        return NULL;
159    }
160
161    jobject brd = createBitmapRegionDecoder(env, stream.get());
162    // The decoder now holds a reference to stream.
163    return brd;
164}
165
166/*
167 * nine patch not supported
168 *
169 * purgeable not supported
170 * reportSizeToVM not supported
171 */
172static jobject nativeDecodeRegion(JNIEnv* env, jobject, jlong brdHandle,
173                                jint start_x, jint start_y, jint width, jint height, jobject options) {
174    SkBitmapRegionDecoder *brd = reinterpret_cast<SkBitmapRegionDecoder*>(brdHandle);
175    jobject tileBitmap = NULL;
176    SkImageDecoder *decoder = brd->getDecoder();
177    int sampleSize = 1;
178    SkColorType prefColorType = kUnknown_SkColorType;
179    bool doDither = true;
180    bool preferQualityOverSpeed = false;
181    bool requireUnpremultiplied = false;
182
183    if (NULL != options) {
184        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
185        // initialize these, in case we fail later on
186        env->SetIntField(options, gOptions_widthFieldID, -1);
187        env->SetIntField(options, gOptions_heightFieldID, -1);
188        env->SetObjectField(options, gOptions_mimeFieldID, 0);
189
190        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
191        prefColorType = GraphicsJNI::getNativeBitmapColorType(env, jconfig);
192        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
193        preferQualityOverSpeed = env->GetBooleanField(options,
194                gOptions_preferQualityOverSpeedFieldID);
195        // Get the bitmap for re-use if it exists.
196        tileBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
197        requireUnpremultiplied = !env->GetBooleanField(options, gOptions_premultipliedFieldID);
198    }
199
200    decoder->setDitherImage(doDither);
201    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
202    decoder->setRequireUnpremultipliedColors(requireUnpremultiplied);
203    AutoDecoderCancel adc(options, decoder);
204
205    // To fix the race condition in case "requestCancelDecode"
206    // happens earlier than AutoDecoderCancel object is added
207    // to the gAutoDecoderCancelMutex linked list.
208    if (NULL != options && env->GetBooleanField(options, gOptions_mCancelID)) {
209        return nullObjectReturn("gOptions_mCancelID");;
210    }
211
212    SkIRect region;
213    region.fLeft = start_x;
214    region.fTop = start_y;
215    region.fRight = start_x + width;
216    region.fBottom = start_y + height;
217    SkBitmap* bitmap = NULL;
218    SkAutoTDelete<SkBitmap> adb;
219
220    if (tileBitmap != NULL) {
221        // Re-use bitmap.
222        bitmap = GraphicsJNI::getNativeBitmap(env, tileBitmap);
223    }
224    if (bitmap == NULL) {
225        bitmap = new SkBitmap;
226        adb.reset(bitmap);
227    }
228
229    if (!brd->decodeRegion(bitmap, region, prefColorType, sampleSize)) {
230        return nullObjectReturn("decoder->decodeRegion returned false");
231    }
232
233    // update options (if any)
234    if (NULL != options) {
235        env->SetIntField(options, gOptions_widthFieldID, bitmap->width());
236        env->SetIntField(options, gOptions_heightFieldID, bitmap->height());
237        // TODO: set the mimeType field with the data from the codec.
238        // but how to reuse a set of strings, rather than allocating new one
239        // each time?
240        env->SetObjectField(options, gOptions_mimeFieldID,
241                            getMimeTypeString(env, decoder->getFormat()));
242    }
243
244    if (tileBitmap != NULL) {
245        bitmap->notifyPixelsChanged();
246        return tileBitmap;
247    }
248
249    // detach bitmap from its autodeleter, since we want to own it now
250    adb.detach();
251
252    JavaPixelAllocator* allocator = (JavaPixelAllocator*) decoder->getAllocator();
253    jbyteArray buff = allocator->getStorageObjAndReset();
254
255    int bitmapCreateFlags = 0;
256    if (!requireUnpremultiplied) bitmapCreateFlags |= GraphicsJNI::kBitmapCreateFlag_Premultiplied;
257    return GraphicsJNI::createBitmap(env, bitmap, buff, bitmapCreateFlags, NULL, NULL, -1);
258}
259
260static jint nativeGetHeight(JNIEnv* env, jobject, jlong brdHandle) {
261    SkBitmapRegionDecoder *brd = reinterpret_cast<SkBitmapRegionDecoder*>(brdHandle);
262    return static_cast<jint>(brd->getHeight());
263}
264
265static jint nativeGetWidth(JNIEnv* env, jobject, jlong brdHandle) {
266    SkBitmapRegionDecoder *brd = reinterpret_cast<SkBitmapRegionDecoder*>(brdHandle);
267    return static_cast<jint>(brd->getWidth());
268}
269
270static void nativeClean(JNIEnv* env, jobject, jlong brdHandle) {
271    SkBitmapRegionDecoder *brd = reinterpret_cast<SkBitmapRegionDecoder*>(brdHandle);
272    delete brd;
273}
274
275///////////////////////////////////////////////////////////////////////////////
276
277#include <android_runtime/AndroidRuntime.h>
278
279static JNINativeMethod gBitmapRegionDecoderMethods[] = {
280    {   "nativeDecodeRegion",
281        "(JIIIILandroid/graphics/BitmapFactory$Options;)Landroid/graphics/Bitmap;",
282        (void*)nativeDecodeRegion},
283
284    {   "nativeGetHeight", "(J)I", (void*)nativeGetHeight},
285
286    {   "nativeGetWidth", "(J)I", (void*)nativeGetWidth},
287
288    {   "nativeClean", "(J)V", (void*)nativeClean},
289
290    {   "nativeNewInstance",
291        "([BIIZ)Landroid/graphics/BitmapRegionDecoder;",
292        (void*)nativeNewInstanceFromByteArray
293    },
294
295    {   "nativeNewInstance",
296        "(Ljava/io/InputStream;[BZ)Landroid/graphics/BitmapRegionDecoder;",
297        (void*)nativeNewInstanceFromStream
298    },
299
300    {   "nativeNewInstance",
301        "(Ljava/io/FileDescriptor;Z)Landroid/graphics/BitmapRegionDecoder;",
302        (void*)nativeNewInstanceFromFileDescriptor
303    },
304
305    {   "nativeNewInstance",
306        "(JZ)Landroid/graphics/BitmapRegionDecoder;",
307        (void*)nativeNewInstanceFromAsset
308    },
309};
310
311#define kClassPathName  "android/graphics/BitmapRegionDecoder"
312
313int register_android_graphics_BitmapRegionDecoder(JNIEnv* env)
314{
315    return android::AndroidRuntime::registerNativeMethods(env, kClassPathName,
316            gBitmapRegionDecoderMethods, SK_ARRAY_COUNT(gBitmapRegionDecoderMethods));
317}
318