android_view_TextureView.cpp revision 9d4efdf2802f06ccf7031610891f75af70ea5538 
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            break;
92        case WINDOW_FORMAT_RGB_565:
93            info.fColorType = kRGB_565_SkColorType;
94            info.fAlphaType = kOpaque_SkAlphaType;
95            break;
96        default:
97            info.fColorType = kUnknown_SkColorType;
98            // switch to kUnknown_SkAlphaType when its in skia
99            info.fAlphaType = kOpaque_SkAlphaType;
100            break;
101    }
102    return info;
103}
104
105/**
106 * This is a private API, and this implementation is also provided in the NDK.
107 * However, the NDK links against android_runtime, which means that using the
108 * NDK implementation would create a circular dependency between the libraries.
109 */
110static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
111        Rect* inOutDirtyBounds) {
112    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
113}
114
115static int32_t native_window_unlockAndPost(ANativeWindow* window) {
116    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
117}
118
119static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
120        jobject surface) {
121
122    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
123    sp<ANativeWindow> window = new Surface(producer, true);
124
125    window->incStrong((void*)android_view_TextureView_createNativeWindow);
126    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
127}
128
129static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
130
131    ANativeWindow* nativeWindow = (ANativeWindow*)
132            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
133
134    if (nativeWindow) {
135        sp<ANativeWindow> window(nativeWindow);
136            window->decStrong((void*)android_view_TextureView_createNativeWindow);
137        SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
138    }
139}
140
141static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
142        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
143
144    if (!nativeWindow) {
145        return JNI_FALSE;
146    }
147
148    ANativeWindow_Buffer buffer;
149
150    Rect rect;
151    if (dirtyRect) {
152        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
153        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
154        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
155        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
156    } else {
157        rect.set(Rect(0x3FFF, 0x3FFF));
158    }
159
160    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
161    int32_t status = native_window_lock(window.get(), &buffer, &rect);
162    if (status) return JNI_FALSE;
163
164    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
165
166    SkBitmap bitmap;
167    bitmap.setInfo(convertPixelFormat(buffer), bytesCount);
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    INVOKEV(canvas, gCanvasClassInfo.setNativeBitmap, reinterpret_cast<jlong>(&bitmap));
177
178    SkRect clipRect;
179    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
180    SkCanvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
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    return JNI_TRUE;
189}
190
191static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
192        jlong nativeWindow, jobject canvas) {
193
194    INVOKEV(canvas, gCanvasClassInfo.setNativeBitmap, (jlong)0);
195
196    if (nativeWindow) {
197        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
198        native_window_unlockAndPost(window.get());
199    }
200}
201
202// ----------------------------------------------------------------------------
203// JNI Glue
204// ----------------------------------------------------------------------------
205
206const char* const kClassPathName = "android/view/TextureView";
207
208static JNINativeMethod gMethods[] = {
209    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
210            (void*) android_view_TextureView_createNativeWindow },
211    {   "nDestroyNativeWindow", "()V",
212            (void*) android_view_TextureView_destroyNativeWindow },
213
214    {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
215            (void*) android_view_TextureView_lockCanvas },
216    {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
217            (void*) android_view_TextureView_unlockCanvasAndPost },
218};
219
220int register_android_view_TextureView(JNIEnv* env) {
221    jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
222    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
223    gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
224    gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
225    gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
226    gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
227
228    clazz = FindClassOrDie(env, "android/graphics/Canvas");
229    gCanvasClassInfo.mSurfaceFormat = GetFieldIDOrDie(env, clazz, "mSurfaceFormat", "I");
230    gCanvasClassInfo.setNativeBitmap = GetMethodIDOrDie(env, clazz, "setNativeBitmap", "(J)V");
231
232    clazz = FindClassOrDie(env, "android/view/TextureView");
233    gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
234
235    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
236}
237
238};
239