android_view_TextureView.cpp revision 9932d648834a8fae4f98e6985ce1112ddf28da0b 
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
32namespace android {
33
34// ----------------------------------------------------------------------------
35// JNI Glue
36// ----------------------------------------------------------------------------
37
38static struct {
39    jmethodID set;
40    jfieldID left;
41    jfieldID top;
42    jfieldID right;
43    jfieldID bottom;
44} gRectClassInfo;
45
46static struct {
47    jfieldID mFinalizer;
48    jfieldID mNativeCanvas;
49    jfieldID mSurfaceFormat;
50} gCanvasClassInfo;
51
52static struct {
53    jfieldID mNativeCanvas;
54} gCanvasFinalizerClassInfo;
55
56static struct {
57    jfieldID nativeWindow;
58} gTextureViewClassInfo;
59
60#define GET_INT(object, field) \
61    env->GetIntField(object, field)
62
63#define GET_LONG(object, field) \
64    env->GetLongField(object, field)
65
66#define SET_INT(object, field, value) \
67    env->SetIntField(object, field, value)
68
69#define SET_LONG(object, field, value) \
70    env->SetLongField(object, field, value)
71
72#define INVOKEV(object, method, ...) \
73    env->CallVoidMethod(object, method, __VA_ARGS__)
74
75// ----------------------------------------------------------------------------
76// Native layer
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<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
110    sp<ANativeWindow> window = new Surface(producer, true);
111
112    window->incStrong((void*)android_view_TextureView_createNativeWindow);
113    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
114}
115
116static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
117
118    ANativeWindow* nativeWindow = (ANativeWindow*)
119            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
120
121    if (nativeWindow) {
122        sp<ANativeWindow> window(nativeWindow);
123            window->decStrong((void*)android_view_TextureView_createNativeWindow);
124        SET_LONG(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->GetLongField(canvasObj, gCanvasClassInfo.mNativeCanvas));
132    env->SetLongField(canvasObj, gCanvasClassInfo.mNativeCanvas, (jlong)newCanvas);
133    env->SetLongField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (jlong)newCanvas);
134    SkSafeUnref(previousCanvas);
135}
136
137static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
138        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
139
140    if (!nativeWindow) {
141        return JNI_FALSE;
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    int32_t status = native_window_lock(window.get(), &buffer, &rect);
158    if (status) return JNI_FALSE;
159
160    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
161
162    SkBitmap bitmap;
163    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
164
165    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
166        bitmap.setAlphaType(kOpaque_SkAlphaType);
167    }
168
169    if (buffer.width > 0 && buffer.height > 0) {
170        bitmap.setPixels(buffer.bits);
171    } else {
172        bitmap.setPixels(NULL);
173    }
174
175    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
176
177    SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
178    swapCanvasPtr(env, canvas, nativeCanvas);
179
180    SkRect clipRect;
181    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
182    nativeCanvas->clipRect(clipRect);
183
184    if (dirtyRect) {
185        INVOKEV(dirtyRect, gRectClassInfo.set,
186                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
187    }
188
189    return JNI_TRUE;
190}
191
192static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
193        jlong nativeWindow, jobject canvas) {
194
195    SkCanvas* nativeCanvas = SkNEW(SkCanvas);
196    swapCanvasPtr(env, canvas, nativeCanvas);
197
198    if (nativeWindow) {
199        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
200        native_window_unlockAndPost(window.get());
201    }
202}
203
204// ----------------------------------------------------------------------------
205// JNI Glue
206// ----------------------------------------------------------------------------
207
208const char* const kClassPathName = "android/view/TextureView";
209
210static JNINativeMethod gMethods[] = {
211    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
212            (void*) android_view_TextureView_createNativeWindow },
213    {   "nDestroyNativeWindow", "()V",
214            (void*) android_view_TextureView_destroyNativeWindow },
215
216    {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
217            (void*) android_view_TextureView_lockCanvas },
218    {   "nUnlockCanvasAndPost", "(JLandroid/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",
245            "Landroid/graphics/Canvas$CanvasFinalizer;");
246    GET_FIELD_ID(gCanvasClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "J");
247    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
248
249    FIND_CLASS(clazz, "android/graphics/Canvas$CanvasFinalizer");
250    GET_FIELD_ID(gCanvasFinalizerClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "J");
251
252    FIND_CLASS(clazz, "android/view/TextureView");
253    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "J");
254
255    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
256}
257
258};
259