android_view_TextureView.cpp revision 24f43c9d2c9c81bfdeeec0c201703cccfba14c51 
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 inline SkBitmap::Config convertPixelFormat(int32_t format) {
73    switch (format) {
74        case WINDOW_FORMAT_RGBA_8888:
75            return SkBitmap::kARGB_8888_Config;
76        case WINDOW_FORMAT_RGBX_8888:
77            return SkBitmap::kARGB_8888_Config;
78        case WINDOW_FORMAT_RGB_565:
79            return SkBitmap::kRGB_565_Config;
80        default:
81            return SkBitmap::kNo_Config;
82    }
83}
84
85/**
86 * This is a private API, and this implementation is also provided in the NDK.
87 * However, the NDK links against android_runtime, which means that using the
88 * NDK implementation would create a circular dependency between the libraries.
89 */
90static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
91        Rect* inOutDirtyBounds) {
92    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
93}
94
95static int32_t native_window_unlockAndPost(ANativeWindow* window) {
96    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
97}
98
99static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
100        jobject surface) {
101
102    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
103    sp<ANativeWindow> window = new Surface(producer, true);
104
105    window->incStrong((void*)android_view_TextureView_createNativeWindow);
106    SET_INT(textureView, gTextureViewClassInfo.nativeWindow, jint(window.get()));
107}
108
109static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
110
111    ANativeWindow* nativeWindow = (ANativeWindow*)
112            GET_INT(textureView, gTextureViewClassInfo.nativeWindow);
113
114    if (nativeWindow) {
115        sp<ANativeWindow> window(nativeWindow);
116            window->decStrong((void*)android_view_TextureView_createNativeWindow);
117        SET_INT(textureView, gTextureViewClassInfo.nativeWindow, 0);
118    }
119}
120
121static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
122    jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
123    SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
124          env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
125    env->SetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas, (int)newCanvas);
126    env->SetIntField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int)newCanvas);
127    SkSafeUnref(previousCanvas);
128}
129
130static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
131        jint nativeWindow, jobject canvas, jobject dirtyRect) {
132
133    if (!nativeWindow) {
134        return false;
135    }
136
137    ANativeWindow_Buffer buffer;
138
139    Rect rect;
140    if (dirtyRect) {
141        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
142        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
143        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
144        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
145    } else {
146        rect.set(Rect(0x3FFF, 0x3FFF));
147    }
148
149    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
150    int32_t status = native_window_lock(window.get(), &buffer, &rect);
151    if (status) return false;
152
153    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
154
155    SkBitmap bitmap;
156    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
157
158    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
159        bitmap.setIsOpaque(true);
160    }
161
162    if (buffer.width > 0 && buffer.height > 0) {
163        bitmap.setPixels(buffer.bits);
164    } else {
165        bitmap.setPixels(NULL);
166    }
167
168    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
169
170    SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
171    swapCanvasPtr(env, canvas, nativeCanvas);
172
173    SkRect clipRect;
174    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
175    nativeCanvas->clipRect(clipRect);
176
177    if (dirtyRect) {
178        INVOKEV(dirtyRect, gRectClassInfo.set,
179                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
180    }
181
182    return true;
183}
184
185static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
186        jint nativeWindow, jobject canvas) {
187
188    SkCanvas* nativeCanvas = SkNEW(SkCanvas);
189    swapCanvasPtr(env, canvas, nativeCanvas);
190
191    if (nativeWindow) {
192        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
193        native_window_unlockAndPost(window.get());
194    }
195}
196
197// ----------------------------------------------------------------------------
198// JNI Glue
199// ----------------------------------------------------------------------------
200
201const char* const kClassPathName = "android/view/TextureView";
202
203static JNINativeMethod gMethods[] = {
204    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
205            (void*) android_view_TextureView_createNativeWindow },
206    {   "nDestroyNativeWindow", "()V",
207            (void*) android_view_TextureView_destroyNativeWindow },
208
209    {   "nLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
210            (void*) android_view_TextureView_lockCanvas },
211    {   "nUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
212            (void*) android_view_TextureView_unlockCanvasAndPost },
213};
214
215#define FIND_CLASS(var, className) \
216        var = env->FindClass(className); \
217        LOG_FATAL_IF(!var, "Unable to find class " className);
218
219#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
220        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
221        LOG_FATAL_IF(!var, "Unable to find method " methodName);
222
223#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
224        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
225        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
226
227int register_android_view_TextureView(JNIEnv* env) {
228    jclass clazz;
229    FIND_CLASS(clazz, "android/graphics/Rect");
230    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
231    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
232    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
233    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
234    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
235
236    FIND_CLASS(clazz, "android/graphics/Canvas");
237    GET_FIELD_ID(gCanvasClassInfo.mFinalizer, clazz, "mFinalizer",
238            "Landroid/graphics/Canvas$CanvasFinalizer;");
239    GET_FIELD_ID(gCanvasClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
240    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
241
242    FIND_CLASS(clazz, "android/graphics/Canvas$CanvasFinalizer");
243    GET_FIELD_ID(gCanvasFinalizerClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
244
245    FIND_CLASS(clazz, "android/view/TextureView");
246    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "I");
247
248    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
249}
250
251};
252