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    SkColorType colorType = kUnknown_SkColorType;
76    SkAlphaType alphaType = kOpaque_SkAlphaType;
77    switch (buffer.format) {
78        case WINDOW_FORMAT_RGBA_8888:
79            colorType = kN32_SkColorType;
80            alphaType = kPremul_SkAlphaType;
81            break;
82        case WINDOW_FORMAT_RGBX_8888:
83            colorType = kN32_SkColorType;
84            alphaType = kOpaque_SkAlphaType;
85            break;
86        case WINDOW_FORMAT_RGB_565:
87            colorType = kRGB_565_SkColorType;
88            alphaType = kOpaque_SkAlphaType;
89            break;
90        default:
91            break;
92    }
93    return SkImageInfo::Make(buffer.width, buffer.height, colorType, alphaType);
94}
95
96/**
97 * This is a private API, and this implementation is also provided in the NDK.
98 * However, the NDK links against android_runtime, which means that using the
99 * NDK implementation would create a circular dependency between the libraries.
100 */
101static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
102        Rect* inOutDirtyBounds) {
103    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
104}
105
106static int32_t native_window_unlockAndPost(ANativeWindow* window) {
107    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
108}
109
110static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
111        jobject surface) {
112
113    sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
114    sp<ANativeWindow> window = new Surface(producer, true);
115
116    window->incStrong((void*)android_view_TextureView_createNativeWindow);
117    SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
118}
119
120static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
121
122    ANativeWindow* nativeWindow = (ANativeWindow*)
123            GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
124
125    if (nativeWindow) {
126        sp<ANativeWindow> window(nativeWindow);
127            window->decStrong((void*)android_view_TextureView_createNativeWindow);
128        SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
129    }
130}
131
132static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
133        jlong nativeWindow, jobject canvas, jobject dirtyRect) {
134
135    if (!nativeWindow) {
136        return JNI_FALSE;
137    }
138
139    ANativeWindow_Buffer buffer;
140
141    Rect rect(Rect::EMPTY_RECT);
142    if (dirtyRect) {
143        rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
144        rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
145        rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
146        rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
147    } else {
148        rect.set(Rect(0x3FFF, 0x3FFF));
149    }
150
151    sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
152    int32_t status = native_window_lock(window.get(), &buffer, &rect);
153    if (status) return JNI_FALSE;
154
155    ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
156
157    SkBitmap bitmap;
158    bitmap.setInfo(convertPixelFormat(buffer), bytesCount);
159
160    if (buffer.width > 0 && buffer.height > 0) {
161        bitmap.setPixels(buffer.bits);
162    } else {
163        bitmap.setPixels(NULL);
164    }
165
166    Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
167    nativeCanvas->setBitmap(bitmap);
168    nativeCanvas->clipRect(rect.left, rect.top, rect.right, rect.bottom);
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    Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
182    nativeCanvas->setBitmap(SkBitmap());
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 const 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
208int register_android_view_TextureView(JNIEnv* env) {
209    jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
210    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
211    gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
212    gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
213    gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
214    gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
215
216    clazz = FindClassOrDie(env, "android/view/TextureView");
217    gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
218
219    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
220}
221
222};
223