android_view_Display.cpp revision 9066cfe9886ac131c34d59ed0e2d287b0e3c0087 
1/*
2 * Copyright (C) 2007 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 <stdio.h>
18#include <assert.h>
19
20#include <ui/SurfaceComposerClient.h>
21#include <ui/PixelFormat.h>
22#include <ui/DisplayInfo.h>
23
24#include "jni.h"
25#include <android_runtime/AndroidRuntime.h>
26#include <utils/misc.h>
27
28// ----------------------------------------------------------------------------
29
30namespace android {
31
32// ----------------------------------------------------------------------------
33
34struct offsets_t {
35    jfieldID display;
36    jfieldID pixelFormat;
37    jfieldID fps;
38    jfieldID density;
39    jfieldID xdpi;
40    jfieldID ydpi;
41};
42static offsets_t offsets;
43
44static void doThrow(JNIEnv* env, const char* exc, const char* msg = NULL)
45{
46    jclass npeClazz = env->FindClass(exc);
47    env->ThrowNew(npeClazz, msg);
48}
49
50// ----------------------------------------------------------------------------
51
52static void android_view_Display_init(
53        JNIEnv* env, jobject clazz, jint dpy)
54{
55    DisplayInfo info;
56    status_t err = SurfaceComposerClient::getDisplayInfo(DisplayID(dpy), &info);
57    if (err < 0) {
58        doThrow(env, "java/lang/IllegalArgumentException");
59        return;
60    }
61    env->SetIntField(clazz, offsets.pixelFormat,info.pixelFormatInfo.format);
62    env->SetFloatField(clazz, offsets.fps,      info.fps);
63    env->SetFloatField(clazz, offsets.density,  info.density);
64    env->SetFloatField(clazz, offsets.xdpi,     info.xdpi);
65    env->SetFloatField(clazz, offsets.ydpi,     info.ydpi);
66}
67
68static jint android_view_Display_getWidth(
69        JNIEnv* env, jobject clazz)
70{
71    DisplayID dpy = env->GetIntField(clazz, offsets.display);
72    return SurfaceComposerClient::getDisplayWidth(dpy);
73}
74
75static jint android_view_Display_getHeight(
76        JNIEnv* env, jobject clazz)
77{
78    DisplayID dpy = env->GetIntField(clazz, offsets.display);
79    return SurfaceComposerClient::getDisplayHeight(dpy);
80}
81
82static jint android_view_Display_getOrientation(
83        JNIEnv* env, jobject clazz)
84{
85    DisplayID dpy = env->GetIntField(clazz, offsets.display);
86    return SurfaceComposerClient::getDisplayOrientation(dpy);
87}
88
89static jint android_view_Display_getDisplayCount(
90        JNIEnv* env, jclass clazz)
91{
92    return SurfaceComposerClient::getNumberOfDisplays();
93}
94
95// ----------------------------------------------------------------------------
96
97const char* const kClassPathName = "android/view/Display";
98
99static void nativeClassInit(JNIEnv* env, jclass clazz);
100
101static JNINativeMethod gMethods[] = {
102    {   "nativeClassInit", "()V",
103            (void*)nativeClassInit },
104    {   "getDisplayCount", "()I",
105            (void*)android_view_Display_getDisplayCount },
106	{   "init", "(I)V",
107            (void*)android_view_Display_init },
108    {   "getWidth", "()I",
109            (void*)android_view_Display_getWidth },
110    {   "getHeight", "()I",
111            (void*)android_view_Display_getHeight },
112    {   "getOrientation", "()I",
113            (void*)android_view_Display_getOrientation }
114};
115
116void nativeClassInit(JNIEnv* env, jclass clazz)
117{
118    offsets.display     = env->GetFieldID(clazz, "mDisplay", "I");
119    offsets.pixelFormat = env->GetFieldID(clazz, "mPixelFormat", "I");
120    offsets.fps         = env->GetFieldID(clazz, "mRefreshRate", "F");
121    offsets.density     = env->GetFieldID(clazz, "mDensity", "F");
122    offsets.xdpi        = env->GetFieldID(clazz, "mDpiX", "F");
123    offsets.ydpi        = env->GetFieldID(clazz, "mDpiY", "F");
124}
125
126int register_android_view_Display(JNIEnv* env)
127{
128    return AndroidRuntime::registerNativeMethods(env,
129            kClassPathName, gMethods, NELEM(gMethods));
130}
131
132};
133
134