android_view_TextureView.cpp revision 7c1a49f5f5ed6613d736464bf5001b777e89ced2 
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/SurfaceTextureClient.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 nativeCanvas;
47    jfieldID surfaceFormat;
48} gCanvasClassInfo;
49
50static struct {
51    jfieldID nativeWindow;
52} gTextureViewClassInfo;
53
54#define GET_INT(object, field) \
55    env->GetIntField(object, field)
56
57#define SET_INT(object, field, value) \
58    env->SetIntField(object, field, value)
59
60#define INVOKEV(object, method, ...) \
61    env->CallVoidMethod(object, method, __VA_ARGS__)
62
63// ----------------------------------------------------------------------------
64// Native layer
65// ----------------------------------------------------------------------------
66
67static void android_view_TextureView_setDefaultBufferSize(JNIEnv* env, jobject,
68    jobject surface, jint width, jint height) {
69
70    sp<GLConsumer> glConsumer(SurfaceTexture_getSurfaceTexture(env, surface));
71    glConsumer->setDefaultBufferSize(width, height);
72}
73
74static inline SkBitmap::Config convertPixelFormat(int32_t format) {
75    switch (format) {
76        case WINDOW_FORMAT_RGBA_8888:
77            return SkBitmap::kARGB_8888_Config;
78        case WINDOW_FORMAT_RGBX_8888:
79            return SkBitmap::kARGB_8888_Config;
80        case WINDOW_FORMAT_RGB_565:
81            return SkBitmap::kRGB_565_Config;
82        default:
83            return SkBitmap::kNo_Config;
84    }
85}
86
87/**
88 * This is a private API, and this implementation is also provided in the NDK.
89 * However, the NDK links against android_runtime, which means that using the
90 * NDK implementation would create a circular dependency between the libraries.
91 */
92static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
93        Rect* inOutDirtyBounds) {
94    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
95}
96
97static int32_t native_window_unlockAndPost(ANativeWindow* window) {
98    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
99}
100
101static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
102        jobject surface) {
103
104    sp<GLConsumer> glConsumer(SurfaceTexture_getSurfaceTexture(env, surface));
105    sp<ANativeWindow> window = new SurfaceTextureClient(glConsumer->getBufferQueue());
106
107    window->incStrong(0);
108    SET_INT(textureView, gTextureViewClassInfo.nativeWindow, jint(window.get()));
109}
110
111static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
112
113    ANativeWindow* nativeWindow = (ANativeWindow*)
114            GET_INT(textureView, gTextureViewClassInfo.nativeWindow);
115
116    if (nativeWindow) {
117        sp<ANativeWindow> window(nativeWindow);
118            window->decStrong(0);
119        SET_INT(textureView, gTextureViewClassInfo.nativeWindow, 0);
120    }
121}
122
123static void android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
124        jint nativeWindow, jobject canvas, jobject dirtyRect) {
125
126    if (!nativeWindow) {
127        return;
128    }
129
130    ANativeWindow_Buffer buffer;
131
132    Rect rect;
133    if (dirtyRect) {
134        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
135        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
136        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
137        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
138    } else {
139        rect.set(Rect(0x3FFF, 0x3FFF));
140    }
141
142    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
143    native_window_lock(window.get(), &buffer, &rect);
144
145    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
146
147    SkBitmap bitmap;
148    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
149
150    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
151        bitmap.setIsOpaque(true);
152    }
153
154    if (buffer.width > 0 && buffer.height > 0) {
155        bitmap.setPixels(buffer.bits);
156    } else {
157        bitmap.setPixels(NULL);
158    }
159
160    SET_INT(canvas, gCanvasClassInfo.surfaceFormat, buffer.format);
161    SkCanvas* nativeCanvas = (SkCanvas*) GET_INT(canvas, gCanvasClassInfo.nativeCanvas);
162    nativeCanvas->setBitmapDevice(bitmap);
163
164    SkRect clipRect;
165    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
166    nativeCanvas->clipRect(clipRect);
167
168    if (dirtyRect) {
169        INVOKEV(dirtyRect, gRectClassInfo.set,
170                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
171    }
172}
173
174static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
175        jint nativeWindow, jobject canvas) {
176
177    SkCanvas* nativeCanvas = (SkCanvas*) GET_INT(canvas, gCanvasClassInfo.nativeCanvas);
178    nativeCanvas->setBitmapDevice(SkBitmap());
179
180    if (nativeWindow) {
181        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
182        native_window_unlockAndPost(window.get());
183    }
184}
185
186// ----------------------------------------------------------------------------
187// JNI Glue
188// ----------------------------------------------------------------------------
189
190const char* const kClassPathName = "android/view/TextureView";
191
192static JNINativeMethod gMethods[] = {
193    {   "nSetDefaultBufferSize", "(Landroid/graphics/SurfaceTexture;II)V",
194            (void*) android_view_TextureView_setDefaultBufferSize },
195
196    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
197            (void*) android_view_TextureView_createNativeWindow },
198    {   "nDestroyNativeWindow", "()V",
199            (void*) android_view_TextureView_destroyNativeWindow },
200
201    {   "nLockCanvas", "(ILandroid/graphics/Canvas;Landroid/graphics/Rect;)V",
202            (void*) android_view_TextureView_lockCanvas },
203    {   "nUnlockCanvasAndPost", "(ILandroid/graphics/Canvas;)V",
204            (void*) android_view_TextureView_unlockCanvasAndPost },
205};
206
207#define FIND_CLASS(var, className) \
208        var = env->FindClass(className); \
209        LOG_FATAL_IF(!var, "Unable to find class " className);
210
211#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
212        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
213        LOG_FATAL_IF(!var, "Unable to find method " methodName);
214
215#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
216        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
217        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
218
219int register_android_view_TextureView(JNIEnv* env) {
220    jclass clazz;
221    FIND_CLASS(clazz, "android/graphics/Rect");
222    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
223    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
224    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
225    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
226    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
227
228    FIND_CLASS(clazz, "android/graphics/Canvas");
229    GET_FIELD_ID(gCanvasClassInfo.nativeCanvas, clazz, "mNativeCanvas", "I");
230    GET_FIELD_ID(gCanvasClassInfo.surfaceFormat, clazz, "mSurfaceFormat", "I");
231
232    FIND_CLASS(clazz, "android/view/TextureView");
233    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "I");
234
235    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
236}
237
238};
239