android_view_TextureView.cpp revision 987f79f60bb1f0a4bcd3ef22e57301c743f0b94f 
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
34#include "core_jni_helpers.h"
35
36namespace android {
37
38// ----------------------------------------------------------------------------
39// JNI Glue
40// ----------------------------------------------------------------------------
41
42static struct {
43    jmethodID set;
44    jfieldID left;
45    jfieldID top;
46    jfieldID right;
47    jfieldID bottom;
48} gRectClassInfo;
49
50static struct {
51    jfieldID mSurfaceFormat;
52    jmethodID setNativeBitmap;
53} gCanvasClassInfo;
54
55static struct {
56    jfieldID nativeWindow;
57} gTextureViewClassInfo;
58
59#define GET_INT(object, field) \
60    env->GetIntField(object, field)
61
62#define GET_LONG(object, field) \
63    env->GetLongField(object, field)
64
65#define SET_INT(object, field, value) \
66    env->SetIntField(object, field, value)
67
68#define SET_LONG(object, field, value) \
69    env->SetLongField(object, field, value)
70
71#define INVOKEV(object, method, ...) \
72    env->CallVoidMethod(object, method, __VA_ARGS__)
73
74// ----------------------------------------------------------------------------
75// Native layer
76// ----------------------------------------------------------------------------
77
78// FIXME: consider exporting this to share (e.g. android_view_Surface.cpp)
79static inline SkImageInfo convertPixelFormat(const ANativeWindow_Buffer& buffer) {
80    SkImageInfo info;
81    info.fWidth = buffer.width;
82    info.fHeight = buffer.height;
83    switch (buffer.format) {
84        case WINDOW_FORMAT_RGBA_8888:
85            info.fColorType = kN32_SkColorType;
86            info.fAlphaType = kPremul_SkAlphaType;
87            break;
88        case WINDOW_FORMAT_RGBX_8888:
89            info.fColorType = kN32_SkColorType;
90            info.fAlphaType = kOpaque_SkAlphaType;
91        case WINDOW_FORMAT_RGB_565:
92            info.fColorType = kRGB_565_SkColorType;
93            info.fAlphaType = kOpaque_SkAlphaType;
94        default:
95            info.fColorType = kUnknown_SkColorType;
96            info.fAlphaType = kIgnore_SkAlphaType;
97            break;
98    }
99    return info;
100}
101
102/**
103 * This is a private API, and this implementation is also provided in the NDK.
104 * However, the NDK links against android_runtime, which means that using the
105 * NDK implementation would create a circular dependency between the libraries.
106 */
107static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
108        Rect* inOutDirtyBounds) {
109    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
110}
111
112static int32_t native_window_unlockAndPost(ANativeWindow* window) {
113    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
114}
115
116static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
117        jobject surface) {
118
119    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
120    sp<ANativeWindow> window = new Surface(producer, true);
121
122    window->incStrong((void*)android_view_TextureView_createNativeWindow);
123    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
124}
125
126static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
127
128    ANativeWindow* nativeWindow = (ANativeWindow*)
129            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
130
131    if (nativeWindow) {
132        sp<ANativeWindow> window(nativeWindow);
133            window->decStrong((void*)android_view_TextureView_createNativeWindow);
134        SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
135    }
136}
137
138static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
139        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
140
141    if (!nativeWindow) {
142        return JNI_FALSE;
143    }
144
145    ANativeWindow_Buffer buffer;
146
147    Rect rect;
148    if (dirtyRect) {
149        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
150        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
151        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
152        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
153    } else {
154        rect.set(Rect(0x3FFF, 0x3FFF));
155    }
156
157    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
158    int32_t status = native_window_lock(window.get(), &buffer, &rect);
159    if (status) return JNI_FALSE;
160
161    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
162
163    SkBitmap bitmap;
164    bitmap.setInfo(convertPixelFormat(buffer), bytesCount);
165
166    if (buffer.width > 0 && buffer.height > 0) {
167        bitmap.setPixels(buffer.bits);
168    } else {
169        bitmap.setPixels(NULL);
170    }
171
172    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
173    INVOKEV(canvas, gCanvasClassInfo.setNativeBitmap, reinterpret_cast<jlong>(&bitmap));
174
175    SkRect clipRect;
176    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
177    SkCanvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
178    nativeCanvas->clipRect(clipRect);
179
180    if (dirtyRect) {
181        INVOKEV(dirtyRect, gRectClassInfo.set,
182                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
183    }
184
185    return JNI_TRUE;
186}
187
188static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
189        jlong nativeWindow, jobject canvas) {
190
191    INVOKEV(canvas, gCanvasClassInfo.setNativeBitmap, (jlong)0);
192
193    if (nativeWindow) {
194        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
195        native_window_unlockAndPost(window.get());
196    }
197}
198
199// ----------------------------------------------------------------------------
200// JNI Glue
201// ----------------------------------------------------------------------------
202
203const char* const kClassPathName = "android/view/TextureView";
204
205static JNINativeMethod gMethods[] = {
206    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
207            (void*) android_view_TextureView_createNativeWindow },
208    {   "nDestroyNativeWindow", "()V",
209            (void*) android_view_TextureView_destroyNativeWindow },
210
211    {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
212            (void*) android_view_TextureView_lockCanvas },
213    {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
214            (void*) android_view_TextureView_unlockCanvasAndPost },
215};
216
217int register_android_view_TextureView(JNIEnv* env) {
218    jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
219    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
220    gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
221    gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
222    gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
223    gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
224
225    clazz = FindClassOrDie(env, "android/graphics/Canvas");
226    gCanvasClassInfo.mSurfaceFormat = GetFieldIDOrDie(env, clazz, "mSurfaceFormat", "I");
227    gCanvasClassInfo.setNativeBitmap = GetMethodIDOrDie(env, clazz, "setNativeBitmap", "(J)V");
228
229    clazz = FindClassOrDie(env, "android/view/TextureView");
230    gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
231
232    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
233}
234
235};
236