android_view_TextureView.cpp revision 434a481b2191562582c79be29f24c2e0b5ca60d0 
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 nativeWindow;
52} gTextureViewClassInfo;
53
54#define GET_INT(object, field) \
55    env->GetIntField(object, field)
56
57#define GET_LONG(object, field) \
58    env->GetLongField(object, field)
59
60#define SET_INT(object, field, value) \
61    env->SetIntField(object, field, value)
62
63#define SET_LONG(object, field, value) \
64    env->SetLongField(object, field, value)
65
66#define INVOKEV(object, method, ...) \
67    env->CallVoidMethod(object, method, __VA_ARGS__)
68
69// ----------------------------------------------------------------------------
70// Native layer
71// ----------------------------------------------------------------------------
72
73// FIXME: consider exporting this to share (e.g. android_view_Surface.cpp)
74static inline SkImageInfo convertPixelFormat(const ANativeWindow_Buffer& buffer) {
75    SkImageInfo info;
76    info.fWidth = buffer.width;
77    info.fHeight = buffer.height;
78    switch (buffer.format) {
79        case WINDOW_FORMAT_RGBA_8888:
80            info.fColorType = kN32_SkColorType;
81            info.fAlphaType = kPremul_SkAlphaType;
82            break;
83        case WINDOW_FORMAT_RGBX_8888:
84            info.fColorType = kN32_SkColorType;
85            info.fAlphaType = kOpaque_SkAlphaType;
86            break;
87        case WINDOW_FORMAT_RGB_565:
88            info.fColorType = kRGB_565_SkColorType;
89            info.fAlphaType = kOpaque_SkAlphaType;
90            break;
91        default:
92            info.fColorType = kUnknown_SkColorType;
93            // switch to kUnknown_SkAlphaType when its in skia
94            info.fAlphaType = kOpaque_SkAlphaType;
95            break;
96    }
97    return info;
98}
99
100/**
101 * This is a private API, and this implementation is also provided in the NDK.
102 * However, the NDK links against android_runtime, which means that using the
103 * NDK implementation would create a circular dependency between the libraries.
104 */
105static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
106        Rect* inOutDirtyBounds) {
107    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
108}
109
110static int32_t native_window_unlockAndPost(ANativeWindow* window) {
111    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
112}
113
114static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
115        jobject surface) {
116
117    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
118    sp<ANativeWindow> window = new Surface(producer, true);
119
120    window->incStrong((void*)android_view_TextureView_createNativeWindow);
121    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
122}
123
124static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
125
126    ANativeWindow* nativeWindow = (ANativeWindow*)
127            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
128
129    if (nativeWindow) {
130        sp<ANativeWindow> window(nativeWindow);
131            window->decStrong((void*)android_view_TextureView_createNativeWindow);
132        SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
133    }
134}
135
136static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
137        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
138
139    if (!nativeWindow) {
140        return JNI_FALSE;
141    }
142
143    ANativeWindow_Buffer buffer;
144
145    Rect rect(Rect::EMPTY_RECT);
146    if (dirtyRect) {
147        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
148        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
149        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
150        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
151    } else {
152        rect.set(Rect(0x3FFF, 0x3FFF));
153    }
154
155    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
156    int32_t status = native_window_lock(window.get(), &buffer, &rect);
157    if (status) return JNI_FALSE;
158
159    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
160
161    SkBitmap bitmap;
162    bitmap.setInfo(convertPixelFormat(buffer), bytesCount);
163
164    if (buffer.width > 0 && buffer.height > 0) {
165        bitmap.setPixels(buffer.bits);
166    } else {
167        bitmap.setPixels(NULL);
168    }
169
170    Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
171    nativeCanvas->setBitmap(bitmap);
172    nativeCanvas->clipRect(rect.left, rect.top, rect.right, rect.bottom);
173
174    if (dirtyRect) {
175        INVOKEV(dirtyRect, gRectClassInfo.set,
176                int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
177    }
178
179    return JNI_TRUE;
180}
181
182static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
183        jlong nativeWindow, jobject canvas) {
184
185    Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
186    nativeCanvas->setBitmap(SkBitmap());
187
188    if (nativeWindow) {
189        sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
190        native_window_unlockAndPost(window.get());
191    }
192}
193
194// ----------------------------------------------------------------------------
195// JNI Glue
196// ----------------------------------------------------------------------------
197
198const char* const kClassPathName = "android/view/TextureView";
199
200static const JNINativeMethod gMethods[] = {
201    {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
202            (void*) android_view_TextureView_createNativeWindow },
203    {   "nDestroyNativeWindow", "()V",
204            (void*) android_view_TextureView_destroyNativeWindow },
205
206    {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
207            (void*) android_view_TextureView_lockCanvas },
208    {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
209            (void*) android_view_TextureView_unlockCanvasAndPost },
210};
211
212int register_android_view_TextureView(JNIEnv* env) {
213    jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
214    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
215    gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
216    gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
217    gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
218    gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
219
220    clazz = FindClassOrDie(env, "android/view/TextureView");
221    gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
222
223    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
224}
225
226};
227