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1 /*
2  * Copyright (C) 2011 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 <nativehelper/JNIHelp.h>
19 #include <android_runtime/AndroidRuntime.h>
20 #include <android_runtime/android_graphics_SurfaceTexture.h>
21 
22 #include <ui/Region.h>
23 #include <ui/Rect.h>
24 
25 #include <gui/GLConsumer.h>
26 #include <gui/Surface.h>
27 
28 #include <android/graphics/canvas.h>
29 
30 #include "core_jni_helpers.h"
31 
32 namespace android {
33 
34 // ----------------------------------------------------------------------------
35 // JNI Glue
36 // ----------------------------------------------------------------------------
37 
38 static struct {
39     jmethodID set;
40     jfieldID left;
41     jfieldID top;
42     jfieldID right;
43     jfieldID bottom;
44 } gRectClassInfo;
45 
46 static struct {
47     jfieldID nativeWindow;
48 } gTextureViewClassInfo;
49 
50 #define GET_INT(object, field) \
51     env->GetIntField(object, field)
52 
53 #define GET_LONG(object, field) \
54     env->GetLongField(object, field)
55 
56 #define SET_INT(object, field, value) \
57     env->SetIntField(object, field, value)
58 
59 #define SET_LONG(object, field, value) \
60     env->SetLongField(object, field, value)
61 
62 #define INVOKEV(object, method, ...) \
63     env->CallVoidMethod(object, method, __VA_ARGS__)
64 
65 // ----------------------------------------------------------------------------
66 // Native layer
67 // ----------------------------------------------------------------------------
68 
69 /**
70  * This is a private API, and this implementation is also provided in the NDK.
71  * However, the NDK links against android_runtime, which means that using the
72  * NDK implementation would create a circular dependency between the libraries.
73  */
native_window_lock(ANativeWindow * window,ANativeWindow_Buffer * outBuffer,Rect * inOutDirtyBounds)74 static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
75         Rect* inOutDirtyBounds) {
76     return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
77 }
78 
native_window_unlockAndPost(ANativeWindow * window)79 static int32_t native_window_unlockAndPost(ANativeWindow* window) {
80     return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
81 }
82 
android_view_TextureView_createNativeWindow(JNIEnv * env,jobject textureView,jobject surface)83 static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
84         jobject surface) {
85 
86     sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
87     sp<ANativeWindow> window = new Surface(producer, true);
88 
89     window->incStrong((void*)android_view_TextureView_createNativeWindow);
90     SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
91 }
92 
android_view_TextureView_destroyNativeWindow(JNIEnv * env,jobject textureView)93 static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
94 
95     ANativeWindow* nativeWindow = (ANativeWindow*)
96             GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
97 
98     if (nativeWindow) {
99         sp<ANativeWindow> window(nativeWindow);
100             window->decStrong((void*)android_view_TextureView_createNativeWindow);
101         SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
102     }
103 }
104 
android_view_TextureView_lockCanvas(JNIEnv * env,jobject,jlong nativeWindow,jobject canvasObj,jobject dirtyRect)105 static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
106         jlong nativeWindow, jobject canvasObj, jobject dirtyRect) {
107 
108     if (!nativeWindow) {
109         return JNI_FALSE;
110     }
111 
112     Rect rect(Rect::EMPTY_RECT);
113     if (dirtyRect) {
114         rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
115         rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
116         rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
117         rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
118     } else {
119         rect.set(Rect(0x3FFF, 0x3FFF));
120     }
121 
122     ANativeWindow_Buffer outBuffer;
123     sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
124     int32_t status = native_window_lock(window.get(), &outBuffer, &rect);
125     if (status) return JNI_FALSE;
126 
127     graphics::Canvas canvas(env, canvasObj);
128     canvas.setBuffer(&outBuffer, ANativeWindow_getBuffersDataSpace(window.get()));
129     canvas.clipRect({rect.left, rect.top, rect.right, rect.bottom});
130 
131     if (dirtyRect) {
132         INVOKEV(dirtyRect, gRectClassInfo.set,
133                 int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
134     }
135 
136     return JNI_TRUE;
137 }
138 
android_view_TextureView_unlockCanvasAndPost(JNIEnv * env,jobject,jlong nativeWindow,jobject canvasObj)139 static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
140         jlong nativeWindow, jobject canvasObj) {
141 
142     // release the buffer from the canvas
143     graphics::Canvas canvas(env, canvasObj);
144     canvas.setBuffer(nullptr, ADATASPACE_UNKNOWN);
145 
146     if (nativeWindow) {
147         sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
148         native_window_unlockAndPost(window.get());
149     }
150 }
151 
152 // ----------------------------------------------------------------------------
153 // JNI Glue
154 // ----------------------------------------------------------------------------
155 
156 const char* const kClassPathName = "android/view/TextureView";
157 
158 static const JNINativeMethod gMethods[] = {
159     {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
160             (void*) android_view_TextureView_createNativeWindow },
161     {   "nDestroyNativeWindow", "()V",
162             (void*) android_view_TextureView_destroyNativeWindow },
163 
164     {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
165             (void*) android_view_TextureView_lockCanvas },
166     {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
167             (void*) android_view_TextureView_unlockCanvasAndPost },
168 };
169 
register_android_view_TextureView(JNIEnv * env)170 int register_android_view_TextureView(JNIEnv* env) {
171     jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
172     gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
173     gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
174     gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
175     gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
176     gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
177 
178     clazz = FindClassOrDie(env, "android/view/TextureView");
179     gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
180 
181     return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
182 }
183 
184 };
185