android_view_TextureView.cpp revision c677675e9c465dc1de21ecf2e0421835c7eb55b4 
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 mSurfaceFormat;
48    jmethodID safeCanvasSwap;
49} gCanvasClassInfo;
50
51static struct {
52    jfieldID nativeWindow;
53} gTextureViewClassInfo;
54
55#define GET_INT(object, field) \
56    env->GetIntField(object, field)
57
58#define GET_LONG(object, field) \
59    env->GetLongField(object, field)
60
61#define SET_INT(object, field, value) \
62    env->SetIntField(object, field, value)
63
64#define SET_LONG(object, field, value) \
65    env->SetLongField(object, field, value)
66
67#define INVOKEV(object, method, ...) \
68    env->CallVoidMethod(object, method, __VA_ARGS__)
69
70// ----------------------------------------------------------------------------
71// Native layer
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<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
105    sp<ANativeWindow> window = new Surface(producer, true);
106
107    window->incStrong((void*)android_view_TextureView_createNativeWindow);
108    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
109}
110
111static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
112
113    ANativeWindow* nativeWindow = (ANativeWindow*)
114            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
115
116    if (nativeWindow) {
117        sp<ANativeWindow> window(nativeWindow);
118            window->decStrong((void*)android_view_TextureView_createNativeWindow);
119        SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
120    }
121}
122
123static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
124        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
125
126    if (!nativeWindow) {
127        return JNI_FALSE;
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    int32_t status = native_window_lock(window.get(), &buffer, &rect);
144    if (status) return JNI_FALSE;
145
146    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
147
148    SkBitmap bitmap;
149    bitmap.setConfig(convertPixelFormat(buffer.format), buffer.width, buffer.height, bytesCount);
150
151    if (buffer.format == WINDOW_FORMAT_RGBX_8888) {
152        bitmap.setAlphaType(kOpaque_SkAlphaType);
153    }
154
155    if (buffer.width > 0 && buffer.height > 0) {
156        bitmap.setPixels(buffer.bits);
157    } else {
158        bitmap.setPixels(NULL);
159    }
160
161    SET_INT(canvas, gCanvasClassInfo.mSurfaceFormat, buffer.format);
162
163    SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (bitmap));
164    INVOKEV(canvas, gCanvasClassInfo.safeCanvasSwap, (jlong)nativeCanvas, false);
165
166    SkRect clipRect;
167    clipRect.set(rect.left, rect.top, rect.right, rect.bottom);
168    nativeCanvas->clipRect(clipRect);
169
170    if (dirtyRect) {
171        INVOKEV(dirtyRect, gRectClassInfo.set,
172                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
173    }
174
175    return JNI_TRUE;
176}
177
178static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
179        jlong nativeWindow, jobject canvas) {
180
181    SkCanvas* nativeCanvas = SkNEW(SkCanvas);
182    INVOKEV(canvas, gCanvasClassInfo.safeCanvasSwap, (jlong)nativeCanvas, false);
183
184    if (nativeWindow) {
185        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
186        native_window_unlockAndPost(window.get());
187    }
188}
189
190// ----------------------------------------------------------------------------
191// JNI Glue
192// ----------------------------------------------------------------------------
193
194const char* const kClassPathName = "android/view/TextureView";
195
196static JNINativeMethod gMethods[] = {
197    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
198            (void*) android_view_TextureView_createNativeWindow },
199    {   "nDestroyNativeWindow", "()V",
200            (void*) android_view_TextureView_destroyNativeWindow },
201
202    {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
203            (void*) android_view_TextureView_lockCanvas },
204    {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
205            (void*) android_view_TextureView_unlockCanvasAndPost },
206};
207
208#define FIND_CLASS(var, className) \
209        var = env->FindClass(className); \
210        LOG_FATAL_IF(!var, "Unable to find class " className);
211
212#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
213        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
214        LOG_FATAL_IF(!var, "Unable to find method " methodName);
215
216#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
217        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
218        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
219
220int register_android_view_TextureView(JNIEnv* env) {
221    jclass clazz;
222    FIND_CLASS(clazz, "android/graphics/Rect");
223    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
224    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
225    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
226    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
227    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
228
229    FIND_CLASS(clazz, "android/graphics/Canvas");
230    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
231    GET_METHOD_ID(gCanvasClassInfo.safeCanvasSwap, clazz, "safeCanvasSwap", "(JZ)V");
232
233    FIND_CLASS(clazz, "android/view/TextureView");
234    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "J");
235
236    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
237}
238
239};
240