Picture.cpp revision 5827cb5059ed0eec4c73adf1acbd7ee47b2c5c8f 
1/*
2 * Copyright (C) 2008 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 "jni.h"
18#include "GraphicsJNI.h"
19#include <android_runtime/AndroidRuntime.h>
20
21#include "SkCanvas.h"
22#include "SkPicture.h"
23#include "SkTemplates.h"
24#include "CreateJavaOutputStreamAdaptor.h"
25
26namespace android {
27
28class SkPictureGlue {
29public:
30    static SkPicture* newPicture(JNIEnv* env, jobject, const SkPicture* src) {
31        if (src) {
32            return new SkPicture(*src);
33        } else {
34            return new SkPicture;
35        }
36    }
37
38    static SkPicture* deserialize(JNIEnv* env, jobject, jobject jstream,
39                                  jbyteArray jstorage) {
40        SkPicture* picture = NULL;
41        SkStream* strm = CreateJavaInputStreamAdaptor(env, jstream, jstorage);
42        if (strm) {
43            picture = SkPicture::CreateFromStream(strm);
44            delete strm;
45        }
46        return picture;
47    }
48
49    static void killPicture(JNIEnv* env, jobject, SkPicture* picture) {
50        SkASSERT(picture);
51        picture->unref();
52    }
53
54    static void draw(JNIEnv* env, jobject, SkCanvas* canvas,
55                            SkPicture* picture) {
56        SkASSERT(canvas);
57        SkASSERT(picture);
58        picture->draw(canvas);
59    }
60
61    static bool serialize(JNIEnv* env, jobject, SkPicture* picture,
62                          jobject jstream, jbyteArray jstorage) {
63        SkWStream* strm = CreateJavaOutputStreamAdaptor(env, jstream, jstorage);
64
65        if (NULL != strm) {
66            picture->serialize(strm);
67            delete strm;
68            return true;
69        }
70        return false;
71    }
72
73    static int getWidth(JNIEnv* env, jobject jpic) {
74        NPE_CHECK_RETURN_ZERO(env, jpic);
75        return GraphicsJNI::getNativePicture(env, jpic)->width();
76    }
77
78    static int getHeight(JNIEnv* env, jobject jpic) {
79        NPE_CHECK_RETURN_ZERO(env, jpic);
80        return GraphicsJNI::getNativePicture(env, jpic)->height();
81    }
82
83    static SkCanvas* beginRecording(JNIEnv* env, jobject, SkPicture* pict,
84                                    int w, int h) {
85        // beginRecording does not ref its return value, it just returns it.
86        SkCanvas* canvas = pict->beginRecording(w, h);
87        // the java side will wrap this guy in a Canvas.java, which will call
88        // unref in its finalizer, so we have to ref it here, so that both that
89        // Canvas.java and our picture can both be owners
90        canvas->ref();
91        return canvas;
92    }
93
94    static void endRecording(JNIEnv* env, jobject, SkPicture* pict) {
95        pict->endRecording();
96    }
97};
98
99static JNINativeMethod gPictureMethods[] = {
100    {"getWidth", "()I", (void*) SkPictureGlue::getWidth},
101    {"getHeight", "()I", (void*) SkPictureGlue::getHeight},
102    {"nativeConstructor", "(I)I", (void*) SkPictureGlue::newPicture},
103    {"nativeCreateFromStream", "(Ljava/io/InputStream;[B)I", (void*)SkPictureGlue::deserialize},
104    {"nativeBeginRecording", "(III)I", (void*) SkPictureGlue::beginRecording},
105    {"nativeEndRecording", "(I)V", (void*) SkPictureGlue::endRecording},
106    {"nativeDraw", "(II)V", (void*) SkPictureGlue::draw},
107    {"nativeWriteToStream", "(ILjava/io/OutputStream;[B)Z", (void*)SkPictureGlue::serialize},
108    {"nativeDestructor","(I)V", (void*) SkPictureGlue::killPicture}
109};
110
111#include <android_runtime/AndroidRuntime.h>
112
113#define REG(env, name, array) \
114    result = android::AndroidRuntime::registerNativeMethods(env, name, array, \
115    SK_ARRAY_COUNT(array));  \
116    if (result < 0) return result
117
118int register_android_graphics_Picture(JNIEnv* env) {
119    int result;
120
121    REG(env, "android/graphics/Picture", gPictureMethods);
122
123    return result;
124}
125
126}
127
128
129