android_view_TextureView.cpp revision 7023df08f14ec5dee76ac54c03e870f84e297636 
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 SET_INT(object, field, value) \
64    env->SetIntField(object, field, value)
65
66#define INVOKEV(object, method, ...) \
67    env->CallVoidMethod(object, method, __VA_ARGS__)
68
69// ----------------------------------------------------------------------------
70// Native layer
71// ----------------------------------------------------------------------------
72
73static inline SkBitmap::Config convertPixelFormat(int32_t format) {
74    switch (format) {
75        case WINDOW_FORMAT_RGBA_8888:
76            return SkBitmap::kARGB_8888_Config;
77        case WINDOW_FORMAT_RGBX_8888:
78            return SkBitmap::kARGB_8888_Config;
79        case WINDOW_FORMAT_RGB_565:
80            return SkBitmap::kRGB_565_Config;
81        default:
82            return SkBitmap::kNo_Config;
83    }
84}
85
86/**
87 * This is a private API, and this implementation is also provided in the NDK.
88 * However, the NDK links against android_runtime, which means that using the
89 * NDK implementation would create a circular dependency between the libraries.
90 */
91static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
92        Rect* inOutDirtyBounds) {
93    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
94}
95
96static int32_t native_window_unlockAndPost(ANativeWindow* window) {
97    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
98}
99
100static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
101        jobject surface) {
102
103    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
104    sp<ANativeWindow> window = new Surface(producer, true);
105
106    window->incStrong((void*)android_view_TextureView_createNativeWindow);
107    SET_INT(textureView, gTextureViewClassInfo.nativeWindow, jint(window.get()));
108}
109
110static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
111
112    ANativeWindow* nativeWindow = (ANativeWindow*)
113            GET_INT(textureView, gTextureViewClassInfo.nativeWindow);
114
115    if (nativeWindow) {
116        sp<ANativeWindow> window(nativeWindow);
117            window->decStrong((void*)android_view_TextureView_createNativeWindow);
118        SET_INT(textureView, gTextureViewClassInfo.nativeWindow, 0);
119    }
120}
121
122static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) {
123    jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer);
124    SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>(
125          env->GetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas));
126    env->SetIntField(canvasObj, gCanvasClassInfo.mNativeCanvas, (int)newCanvas);
127    env->SetIntField(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int)newCanvas);
128    SkSafeUnref(previousCanvas);
129}
130
131static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
132        jint nativeWindow, jobject canvas, jobject dirtyRect) {
133
134    if (!nativeWindow) {
135        return false;
136    }
137
138    ANativeWindow_Buffer buffer;
139
140    Rect rect;
141    if (dirtyRect) {
142        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
143        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
144        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
145        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
146    } else {
147        rect.set(Rect(0x3FFF, 0x3FFF));
148    }
149
150    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
151    int32_t status = native_window_lock(window.get(), &buffer, &rect);
152    if (status) return false;
153
154    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
155
156    SkBitmap bitmap;
157    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
158
159    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
160        bitmap.setAlphaType(kOpaque_SkAlphaType);
161    }
162
163    if (buffer.width > 0 && buffer.height > 0) {
164        bitmap.setPixels(buffer.bits);
165    } else {
166        bitmap.setPixels(NULL);
167    }
168
169    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
170
171    SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
172    swapCanvasPtr(env, canvas, nativeCanvas);
173
174    SkRect clipRect;
175    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
176    nativeCanvas->clipRect(clipRect);
177
178    if (dirtyRect) {
179        INVOKEV(dirtyRect, gRectClassInfo.set,
180                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
181    }
182
183    return true;
184}
185
186static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
187        jint nativeWindow, jobject canvas) {
188
189    SkCanvas* nativeCanvas = SkNEW(SkCanvas);
190    swapCanvasPtr(env, canvas, nativeCanvas);
191
192    if (nativeWindow) {
193        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
194        native_window_unlockAndPost(window.get());
195    }
196}
197
198// ----------------------------------------------------------------------------
199// JNI Glue
200// ----------------------------------------------------------------------------
201
202const char* const kClassPathName = "android/view/TextureView";
203
204static JNINativeMethod gMethods[] = {
205    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
206            (void*) android_view_TextureView_createNativeWindow },
207    {   "nDestroyNativeWindow", "()V",
208            (void*) android_view_TextureView_destroyNativeWindow },
209
210    {   "nLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
211            (void*) android_view_TextureView_lockCanvas },
212    {   "nUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
213            (void*) android_view_TextureView_unlockCanvasAndPost },
214};
215
216#define FIND_CLASS(var, className) \
217        var = env->FindClass(className); \
218        LOG_FATAL_IF(!var, "Unable to find class " className);
219
220#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
221        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
222        LOG_FATAL_IF(!var, "Unable to find method " methodName);
223
224#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
225        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
226        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
227
228int register_android_view_TextureView(JNIEnv* env) {
229    jclass clazz;
230    FIND_CLASS(clazz, "android/graphics/Rect");
231    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
232    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
233    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
234    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
235    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
236
237    FIND_CLASS(clazz, "android/graphics/Canvas");
238    GET_FIELD_ID(gCanvasClassInfo.mFinalizer, clazz, "mFinalizer",
239            "Landroid/graphics/Canvas$CanvasFinalizer;");
240    GET_FIELD_ID(gCanvasClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
241    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
242
243    FIND_CLASS(clazz, "android/graphics/Canvas$CanvasFinalizer");
244    GET_FIELD_ID(gCanvasFinalizerClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I");
245
246    FIND_CLASS(clazz, "android/view/TextureView");
247    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "I");
248
249    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
250}
251
252};
253