android_view_TextureView.cpp revision 5c3d927e17e98e8fd4a9f3c86f7f4def0bcfa816 
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 <SkBitmap.h>
29#include <SkCanvas.h>
30#include <SkImage.h>
31
32#include "android/graphics/GraphicsJNI.h"
33
34namespace android {
35
36// ----------------------------------------------------------------------------
37// JNI Glue
38// ----------------------------------------------------------------------------
39
40static struct {
41    jmethodID set;
42    jfieldID left;
43    jfieldID top;
44    jfieldID right;
45    jfieldID bottom;
46} gRectClassInfo;
47
48static struct {
49    jfieldID mSurfaceFormat;
50    jmethodID setNativeBitmap;
51} gCanvasClassInfo;
52
53static struct {
54    jfieldID nativeWindow;
55} gTextureViewClassInfo;
56
57#define GET_INT(object, field) \
58    env->GetIntField(object, field)
59
60#define GET_LONG(object, field) \
61    env->GetLongField(object, field)
62
63#define SET_INT(object, field, value) \
64    env->SetIntField(object, field, value)
65
66#define SET_LONG(object, field, value) \
67    env->SetLongField(object, field, value)
68
69#define INVOKEV(object, method, ...) \
70    env->CallVoidMethod(object, method, __VA_ARGS__)
71
72// ----------------------------------------------------------------------------
73// Native layer
74// ----------------------------------------------------------------------------
75
76static inline SkBitmap::Config convertPixelFormat(int32_t format) {
77    switch (format) {
78        case WINDOW_FORMAT_RGBA_8888:
79            return SkBitmap::kARGB_8888_Config;
80        case WINDOW_FORMAT_RGBX_8888:
81            return SkBitmap::kARGB_8888_Config;
82        case WINDOW_FORMAT_RGB_565:
83            return SkBitmap::kRGB_565_Config;
84        default:
85            return SkBitmap::kNo_Config;
86    }
87}
88
89/**
90 * This is a private API, and this implementation is also provided in the NDK.
91 * However, the NDK links against android_runtime, which means that using the
92 * NDK implementation would create a circular dependency between the libraries.
93 */
94static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
95        Rect* inOutDirtyBounds) {
96    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
97}
98
99static int32_t native_window_unlockAndPost(ANativeWindow* window) {
100    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
101}
102
103static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
104        jobject surface) {
105
106    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
107    sp<ANativeWindow> window = new Surface(producer, true);
108
109    window->incStrong((void*)android_view_TextureView_createNativeWindow);
110    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
111}
112
113static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
114
115    ANativeWindow* nativeWindow = (ANativeWindow*)
116            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
117
118    if (nativeWindow) {
119        sp<ANativeWindow> window(nativeWindow);
120            window->decStrong((void*)android_view_TextureView_createNativeWindow);
121        SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
122    }
123}
124
125static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
126        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
127
128    if (!nativeWindow) {
129        return JNI_FALSE;
130    }
131
132    ANativeWindow_Buffer buffer;
133
134    Rect rect;
135    if (dirtyRect) {
136        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
137        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
138        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
139        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
140    } else {
141        rect.set(Rect(0x3FFF, 0x3FFF));
142    }
143
144    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
145    int32_t status = native_window_lock(window.get(), &buffer, &rect);
146    if (status) return JNI_FALSE;
147
148    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
149
150    SkBitmap bitmap;
151    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
152
153    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
154        bitmap.setAlphaType(kOpaque_SkAlphaType);
155    }
156
157    if (buffer.width > 0 && buffer.height > 0) {
158        bitmap.setPixels(buffer.bits);
159    } else {
160        bitmap.setPixels(NULL);
161    }
162
163    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
164    INVOKEV(canvas, gCanvasClassInfo.setNativeBitmap, reinterpret_cast<jlong>(&bitmap));
165
166    SkRect clipRect;
167    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
168    SkCanvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
169    nativeCanvas->clipRect(clipRect);
170
171    if (dirtyRect) {
172        INVOKEV(dirtyRect, gRectClassInfo.set,
173                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
174    }
175
176    return JNI_TRUE;
177}
178
179static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
180        jlong nativeWindow, jobject canvas) {
181
182    INVOKEV(canvas, gCanvasClassInfo.setNativeBitmap, (jlong)0);
183
184    if (nativeWindow) {
185        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
186        native_window_unlockAndPost(window.get());
187    }
188}
189
190// ----------------------------------------------------------------------------
191// JNI Glue
192// ----------------------------------------------------------------------------
193
194const char* const kClassPathName = "android/view/TextureView";
195
196static JNINativeMethod gMethods[] = {
197    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
198            (void*) android_view_TextureView_createNativeWindow },
199    {   "nDestroyNativeWindow", "()V",
200            (void*) android_view_TextureView_destroyNativeWindow },
201
202    {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
203            (void*) android_view_TextureView_lockCanvas },
204    {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
205            (void*) android_view_TextureView_unlockCanvasAndPost },
206};
207
208#define FIND_CLASS(var, className) \
209        var = env->FindClass(className); \
210        LOG_FATAL_IF(!var, "Unable to find class " className);
211
212#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
213        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
214        LOG_FATAL_IF(!var, "Unable to find method " methodName);
215
216#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
217        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
218        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
219
220int register_android_view_TextureView(JNIEnv* env) {
221    jclass clazz;
222    FIND_CLASS(clazz, "android/graphics/Rect");
223    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
224    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
225    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
226    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
227    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
228
229    FIND_CLASS(clazz, "android/graphics/Canvas");
230    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
231    GET_METHOD_ID(gCanvasClassInfo.setNativeBitmap, clazz, "setNativeBitmap", "(J)V");
232
233    FIND_CLASS(clazz, "android/view/TextureView");
234    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "J");
235
236    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
237}
238
239};
240