FrameSequenceJNI.cpp revision 9d34bc31927f47e91ba85980d4d146593cbbe1a8 
1/*
2 * Copyright (C) 2013 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#include <android/bitmap.h>
18#include "JNIHelpers.h"
19#include "utils/log.h"
20#include "FrameSequence.h"
21
22#include "FrameSequenceJNI.h"
23
24#define JNI_PACKAGE "android/support/rastermill"
25
26static struct {
27    jclass clazz;
28    jmethodID ctor;
29} gFrameSequenceClassInfo;
30
31////////////////////////////////////////////////////////////////////////////////
32// Frame sequence
33////////////////////////////////////////////////////////////////////////////////
34
35static jobject createJavaFrameSequence(JNIEnv* env, FrameSequence* frameSequence) {
36    if (!frameSequence) {
37        return NULL;
38    }
39    return env->NewObject(gFrameSequenceClassInfo.clazz, gFrameSequenceClassInfo.ctor,
40            reinterpret_cast<jlong>(frameSequence),
41            frameSequence->getWidth(),
42            frameSequence->getHeight(),
43            frameSequence->isOpaque(),
44            frameSequence->getFrameCount(),
45            frameSequence->getDefaultLoopCount());
46}
47
48static jobject nativeDecodeByteArray(JNIEnv* env, jobject clazz,
49        jbyteArray byteArray, jint offset, jint length) {
50    jbyte* bytes = reinterpret_cast<jbyte*>(env->GetPrimitiveArrayCritical(byteArray, NULL));
51    if (bytes == NULL) {
52        jniThrowException(env, ILLEGAL_STATE_EXEPTION,
53                "couldn't read array bytes");
54        return NULL;
55    }
56    MemoryStream stream(bytes + offset, length);
57    FrameSequence* frameSequence = FrameSequence::create(&stream);
58    env->ReleasePrimitiveArrayCritical(byteArray, bytes, 0);
59    return createJavaFrameSequence(env, frameSequence);
60}
61
62static jobject nativeDecodeStream(JNIEnv* env, jobject clazz,
63        jobject istream, jbyteArray byteArray) {
64    JavaInputStream stream(env, istream, byteArray);
65    FrameSequence* frameSequence = FrameSequence::create(&stream);
66    return createJavaFrameSequence(env, frameSequence);
67}
68
69static void nativeDestroyFrameSequence(JNIEnv* env, jobject clazz,
70        jlong frameSequenceLong) {
71    FrameSequence* frameSequence = reinterpret_cast<FrameSequence*>(frameSequenceLong);
72    delete frameSequence;
73}
74
75static jlong nativeCreateState(JNIEnv* env, jobject clazz, jlong frameSequenceLong) {
76    FrameSequence* frameSequence = reinterpret_cast<FrameSequence*>(frameSequenceLong);
77    FrameSequenceState* state = frameSequence->createState();
78    return reinterpret_cast<jlong>(state);
79}
80
81////////////////////////////////////////////////////////////////////////////////
82// Frame sequence state
83////////////////////////////////////////////////////////////////////////////////
84
85static void nativeDestroyState(
86        JNIEnv* env, jobject clazz, jlong frameSequenceStateLong) {
87    FrameSequenceState* frameSequenceState =
88            reinterpret_cast<FrameSequenceState*>(frameSequenceStateLong);
89    delete frameSequenceState;
90}
91
92static jlong JNICALL nativeGetFrame(
93        JNIEnv* env, jobject clazz, jlong frameSequenceStateLong, jint frameNr,
94        jobject bitmap, jint previousFrameNr) {
95    FrameSequenceState* frameSequenceState =
96            reinterpret_cast<FrameSequenceState*>(frameSequenceStateLong);
97    int ret;
98    AndroidBitmapInfo info;
99    void* pixels;
100    if ((ret = AndroidBitmap_getInfo(env, bitmap, &info)) < 0) {
101
102        jniThrowException(env, ILLEGAL_STATE_EXEPTION,
103                "Couldn't get info from Bitmap ");
104        return 0;
105    }
106
107    if ((ret = AndroidBitmap_lockPixels(env, bitmap, &pixels)) < 0) {
108        jniThrowException(env, ILLEGAL_STATE_EXEPTION,
109                "Bitmap pixels couldn't be locked");
110        return 0;
111    }
112
113    int pixelStride = info.stride >> 2;
114    jlong delayMs = frameSequenceState->drawFrame(frameNr,
115            (Color8888*) pixels, pixelStride, previousFrameNr);
116
117    AndroidBitmap_unlockPixels(env, bitmap);
118    return delayMs;
119}
120
121static JNINativeMethod gMethods[] = {
122    {   "nativeDecodeByteArray",
123        "([BII)L" JNI_PACKAGE "/FrameSequence;",
124        (void*) nativeDecodeByteArray
125    },
126    {   "nativeDecodeStream",
127        "(Ljava/io/InputStream;[B)L" JNI_PACKAGE "/FrameSequence;",
128        (void*) nativeDecodeStream
129    },
130    {   "nativeDestroyFrameSequence",
131        "(J)V",
132        (void*) nativeDestroyFrameSequence
133    },
134    {   "nativeCreateState",
135        "(J)J",
136        (void*) nativeCreateState
137    },
138    {   "nativeGetFrame",
139        "(JILandroid/graphics/Bitmap;I)J",
140        (void*) nativeGetFrame
141    },
142    {   "nativeDestroyState",
143        "(J)V",
144        (void*) nativeDestroyState
145    },
146};
147
148jint FrameSequence_OnLoad(JNIEnv* env) {
149    // Get jclass with env->FindClass.
150    // Register methods with env->RegisterNatives.
151    gFrameSequenceClassInfo.clazz = env->FindClass(JNI_PACKAGE "/FrameSequence");
152    if (!gFrameSequenceClassInfo.clazz) {
153        ALOGW("Failed to find " JNI_PACKAGE "/FrameSequence");
154        return -1;
155    }
156    gFrameSequenceClassInfo.clazz = (jclass)env->NewGlobalRef(gFrameSequenceClassInfo.clazz);
157
158    gFrameSequenceClassInfo.ctor = env->GetMethodID(gFrameSequenceClassInfo.clazz, "<init>", "(JIIZII)V");
159    if (!gFrameSequenceClassInfo.ctor) {
160        ALOGW("Failed to find constructor for FrameSequence - was it stripped?");
161        return -1;
162    }
163
164    return env->RegisterNatives(gFrameSequenceClassInfo.clazz, gMethods, METHOD_COUNT(gMethods));
165}
166