Picture.cpp revision c7797525084ba0ea441e394aa0a2ba35d6ff3320 
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 "SkStream.h"
24#include "SkTemplates.h"
25#include "CreateJavaOutputStreamAdaptor.h"
26
27namespace android {
28
29class SkPictureGlue {
30public:
31    static SkPicture* newPicture(JNIEnv* env, jobject, const SkPicture* src) {
32        if (src) {
33            return new SkPicture(*src);
34        } else {
35            return new SkPicture;
36        }
37    }
38
39    static SkPicture* deserialize(JNIEnv* env, jobject, jobject jstream,
40                                  jbyteArray jstorage) {
41        SkPicture* picture = NULL;
42        SkStream* strm = CreateJavaInputStreamAdaptor(env, jstream, jstorage);
43        if (strm) {
44            picture = SkPicture::CreateFromStream(strm);
45            delete strm;
46        }
47        return picture;
48    }
49
50    static void killPicture(JNIEnv* env, jobject, SkPicture* picture) {
51        SkASSERT(picture);
52        picture->unref();
53    }
54
55    static void draw(JNIEnv* env, jobject, SkCanvas* canvas,
56                            SkPicture* picture) {
57        SkASSERT(canvas);
58        SkASSERT(picture);
59        picture->draw(canvas);
60    }
61
62    static bool serialize(JNIEnv* env, jobject, SkPicture* picture,
63                          jobject jstream, jbyteArray jstorage) {
64        SkWStream* strm = CreateJavaOutputStreamAdaptor(env, jstream, jstorage);
65
66        if (NULL != strm) {
67            picture->serialize(strm);
68            delete strm;
69            return true;
70        }
71        return false;
72    }
73
74    static int getWidth(JNIEnv* env, jobject jpic) {
75        NPE_CHECK_RETURN_ZERO(env, jpic);
76        return GraphicsJNI::getNativePicture(env, jpic)->width();
77    }
78
79    static int getHeight(JNIEnv* env, jobject jpic) {
80        NPE_CHECK_RETURN_ZERO(env, jpic);
81        return GraphicsJNI::getNativePicture(env, jpic)->height();
82    }
83
84    static SkCanvas* beginRecording(JNIEnv* env, jobject, SkPicture* pict,
85                                    int w, int h) {
86        // beginRecording does not ref its return value, it just returns it.
87        SkCanvas* canvas = pict->beginRecording(w, h);
88        // the java side will wrap this guy in a Canvas.java, which will call
89        // unref in its finalizer, so we have to ref it here, so that both that
90        // Canvas.java and our picture can both be owners
91        canvas->ref();
92        return canvas;
93    }
94
95    static void endRecording(JNIEnv* env, jobject, SkPicture* pict) {
96        pict->endRecording();
97    }
98};
99
100static JNINativeMethod gPictureMethods[] = {
101    {"getWidth", "()I", (void*) SkPictureGlue::getWidth},
102    {"getHeight", "()I", (void*) SkPictureGlue::getHeight},
103    {"nativeConstructor", "(I)I", (void*) SkPictureGlue::newPicture},
104    {"nativeCreateFromStream", "(Ljava/io/InputStream;[B)I", (void*)SkPictureGlue::deserialize},
105    {"nativeBeginRecording", "(III)I", (void*) SkPictureGlue::beginRecording},
106    {"nativeEndRecording", "(I)V", (void*) SkPictureGlue::endRecording},
107    {"nativeDraw", "(II)V", (void*) SkPictureGlue::draw},
108    {"nativeWriteToStream", "(ILjava/io/OutputStream;[B)Z", (void*)SkPictureGlue::serialize},
109    {"nativeDestructor","(I)V", (void*) SkPictureGlue::killPicture}
110};
111
112#include <android_runtime/AndroidRuntime.h>
113
114#define REG(env, name, array) \
115    result = android::AndroidRuntime::registerNativeMethods(env, name, array, \
116    SK_ARRAY_COUNT(array));  \
117    if (result < 0) return result
118
119int register_android_graphics_Picture(JNIEnv* env) {
120    int result;
121
122    REG(env, "android/graphics/Picture", gPictureMethods);
123
124    return result;
125}
126
127}
128
129
130