android_view_TextureView.cpp revision 76f56dd598045dadae6dee5e8547bd077b980d5c 
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
31namespace android {
32
33// ----------------------------------------------------------------------------
34// JNI Glue
35// ----------------------------------------------------------------------------
36
37static struct {
38    jmethodID set;
39    jfieldID left;
40    jfieldID top;
41    jfieldID right;
42    jfieldID bottom;
43} gRectClassInfo;
44
45static struct {
46    jfieldID mFinalizer;
47    jfieldID mNativeCanvas;
48    jfieldID mSurfaceFormat;
49} gCanvasClassInfo;
50
51static struct {
52    jfieldID mNativeCanvas;
53} gCanvasFinalizerClassInfo;
54
55static struct {
56    jfieldID nativeWindow;
57} gTextureViewClassInfo;
58
59#define GET_INT(object, field) \
60    env->GetIntField(object, field)
61
62#define SET_INT(object, field, value) \
63    env->SetIntField(object, field, value)
64
65#define INVOKEV(object, method, ...) \
66    env->CallVoidMethod(object, method, __VA_ARGS__)
67
68// ----------------------------------------------------------------------------
69// Native layer
70// ----------------------------------------------------------------------------
71
72static void android_view_TextureView_setDefaultBufferSize(JNIEnv* env, jobject,
73    jobject surface, jint width, jint height) {
74
75    sp<GLConsumer> glConsumer(SurfaceTexture_getSurfaceTexture(env, surface));
76    glConsumer->setDefaultBufferSize(width, height);
77}
78
79static inline SkBitmap::Config convertPixelFormat(int32_t format) {
80    switch (format) {
81        case WINDOW_FORMAT_RGBA_8888:
82            return SkBitmap::kARGB_8888_Config;
83        case WINDOW_FORMAT_RGBX_8888:
84            return SkBitmap::kARGB_8888_Config;
85        case WINDOW_FORMAT_RGB_565:
86            return SkBitmap::kRGB_565_Config;
87        default:
88            return SkBitmap::kNo_Config;
89    }
90}
91
92/**
93 * This is a private API, and this implementation is also provided in the NDK.
94 * However, the NDK links against android_runtime, which means that using the
95 * NDK implementation would create a circular dependency between the libraries.
96 */
97static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
98        Rect* inOutDirtyBounds) {
99    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
100}
101
102static int32_t native_window_unlockAndPost(ANativeWindow* window) {
103    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
104}
105
106static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
107        jobject surface) {
108
109    sp<GLConsumer> glConsumer(SurfaceTexture_getSurfaceTexture(env, surface));
110    sp<ANativeWindow> window = new Surface(glConsumer->getBufferQueue());
111
112    window->incStrong(0);
113    SET_INT(textureView, gTextureViewClassInfo.nativeWindow, jint(window.get()));
114}
115
116static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
117
118    ANativeWindow* nativeWindow = (ANativeWindow*)
119            GET_INT(textureView, gTextureViewClassInfo.nativeWindow);
120
121    if (nativeWindow) {
122        sp<ANativeWindow> window(nativeWindow);
123            window->decStrong(0);
124        SET_INT(textureView, gTextureViewClassInfo.nativeWindow, 0);
125    }
126}
127
128static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
129  jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
130  SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
131          env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
132  env->SetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas, (int)newCanvas);
133  env->SetIntField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int)newCanvas);
134  SkSafeUnref(previousCanvas);
135}
136
137static void android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
138        jint nativeWindow, jobject canvas, jobject dirtyRect) {
139
140    if (!nativeWindow) {
141        return;
142    }
143
144    ANativeWindow_Buffer buffer;
145
146    Rect rect;
147    if (dirtyRect) {
148        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
149        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
150        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
151        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
152    } else {
153        rect.set(Rect(0x3FFF, 0x3FFF));
154    }
155
156    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
157    native_window_lock(window.get(), &buffer, &rect);
158
159    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
160
161    SkBitmap bitmap;
162    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
163
164    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
165        bitmap.setIsOpaque(true);
166    }
167
168    if (buffer.width > 0 && buffer.height > 0) {
169        bitmap.setPixels(buffer.bits);
170    } else {
171        bitmap.setPixels(NULL);
172    }
173
174    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
175
176    SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
177    swapCanvasPtr(env, canvas, nativeCanvas);
178
179    SkRect clipRect;
180    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
181    nativeCanvas->clipRect(clipRect);
182
183    if (dirtyRect) {
184        INVOKEV(dirtyRect, gRectClassInfo.set,
185                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
186    }
187}
188
189static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
190        jint nativeWindow, jobject canvas) {
191
192    SkCanvas* nativeCanvas = SkNEW(SkCanvas);
193    swapCanvasPtr(env, canvas, nativeCanvas);
194
195    if (nativeWindow) {
196        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
197        native_window_unlockAndPost(window.get());
198    }
199}
200
201// ----------------------------------------------------------------------------
202// JNI Glue
203// ----------------------------------------------------------------------------
204
205const char* const kClassPathName = "android/view/TextureView";
206
207static JNINativeMethod gMethods[] = {
208    {   "nSetDefaultBufferSize", "(Landroid/graphics/SurfaceTexture;II)V",
209            (void*) android_view_TextureView_setDefaultBufferSize },
210
211    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
212            (void*) android_view_TextureView_createNativeWindow },
213    {   "nDestroyNativeWindow", "()V",
214            (void*) android_view_TextureView_destroyNativeWindow },
215
216    {   "nLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)V",
217            (void*) android_view_TextureView_lockCanvas },
218    {   "nUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
219            (void*) android_view_TextureView_unlockCanvasAndPost },
220};
221
222#define FIND_CLASS(var, className) \
223        var = env->FindClass(className); \
224        LOG_FATAL_IF(!var, "Unable to find class " className);
225
226#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
227        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
228        LOG_FATAL_IF(!var, "Unable to find method " methodName);
229
230#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
231        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
232        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
233
234int register_android_view_TextureView(JNIEnv* env) {
235    jclass clazz;
236    FIND_CLASS(clazz, "android/graphics/Rect");
237    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
238    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
239    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
240    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
241    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
242
243    FIND_CLASS(clazz, "android/graphics/Canvas");
244    GET_FIELD_ID(gCanvasClassInfo.mFinalizer, clazz, "mFinalizer", "Landroid/graphics/Canvas$CanvasFinalizer;");
245    GET_FIELD_ID(gCanvasClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
246    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
247
248    FIND_CLASS(clazz, "android/graphics/Canvas$CanvasFinalizer");
249    GET_FIELD_ID(gCanvasFinalizerClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
250
251    FIND_CLASS(clazz, "android/view/TextureView");
252    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "I");
253
254    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
255}
256
257};
258