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      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 
     27 namespace android {
     28 
     29 class SkPictureGlue {
     30 public:
     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 
    100 static 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 
    119 int 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