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 <cutils/properties.h>
21
22#include <gui/SurfaceComposerClient.h>
23#include <ui/PixelFormat.h>
24#include <ui/DisplayInfo.h>
25
26#include "jni.h"
27#include "JNIHelp.h"
28#include <android_runtime/AndroidRuntime.h>
29#include <utils/misc.h>
30#include <utils/Log.h>
31#include <cutils/properties.h>
32
33// ----------------------------------------------------------------------------
34
35namespace android {
36
37// ----------------------------------------------------------------------------
38
39struct offsets_t {
40    jfieldID display;
41    jfieldID pixelFormat;
42    jfieldID fps;
43    jfieldID density;
44    jfieldID xdpi;
45    jfieldID ydpi;
46};
47static offsets_t offsets;
48static bool headless = false;
49
50// ----------------------------------------------------------------------------
51
52static void android_view_Display_init(
53        JNIEnv* env, jobject clazz, jint dpy)
54{
55    DisplayInfo info;
56    if (headless) {
57        // initialize dummy display with reasonable values
58        info.pixelFormatInfo.format = 1; // RGB_8888
59        info.fps = 60;
60        info.density = 160;
61        info.xdpi = 160;
62        info.ydpi = 160;
63    } else {
64        status_t err = SurfaceComposerClient::getDisplayInfo(DisplayID(dpy), &info);
65        if (err < 0) {
66            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
67            return;
68        }
69    }
70    env->SetIntField(clazz, offsets.pixelFormat,info.pixelFormatInfo.format);
71    env->SetFloatField(clazz, offsets.fps,      info.fps);
72    env->SetFloatField(clazz, offsets.density,  info.density);
73    env->SetFloatField(clazz, offsets.xdpi,     info.xdpi);
74    env->SetFloatField(clazz, offsets.ydpi,     info.ydpi);
75}
76
77static jint android_view_Display_getRawWidthNative(
78        JNIEnv* env, jobject clazz)
79{
80    if (headless) return 640;
81    DisplayID dpy = env->GetIntField(clazz, offsets.display);
82    return SurfaceComposerClient::getDisplayWidth(dpy);
83}
84
85static jint android_view_Display_getRawHeightNative(
86        JNIEnv* env, jobject clazz)
87{
88    if (headless) return 480;
89    DisplayID dpy = env->GetIntField(clazz, offsets.display);
90    return SurfaceComposerClient::getDisplayHeight(dpy);
91}
92
93static jint android_view_Display_getOrientation(
94        JNIEnv* env, jobject clazz)
95{
96    if (headless) return 0; // Surface.ROTATION_0
97    DisplayID dpy = env->GetIntField(clazz, offsets.display);
98    return SurfaceComposerClient::getDisplayOrientation(dpy);
99}
100
101static jint android_view_Display_getDisplayCount(
102        JNIEnv* env, jclass clazz)
103{
104    if (headless) return 1;
105    return SurfaceComposerClient::getNumberOfDisplays();
106}
107
108// ----------------------------------------------------------------------------
109
110const char* const kClassPathName = "android/view/Display";
111
112static void nativeClassInit(JNIEnv* env, jclass clazz);
113
114static JNINativeMethod gMethods[] = {
115    {   "nativeClassInit", "()V",
116            (void*)nativeClassInit },
117    {   "getDisplayCount", "()I",
118            (void*)android_view_Display_getDisplayCount },
119	{   "init", "(I)V",
120            (void*)android_view_Display_init },
121    {   "getRawWidthNative", "()I",
122            (void*)android_view_Display_getRawWidthNative },
123    {   "getRawHeightNative", "()I",
124            (void*)android_view_Display_getRawHeightNative },
125    {   "getOrientation", "()I",
126            (void*)android_view_Display_getOrientation }
127};
128
129void nativeClassInit(JNIEnv* env, jclass clazz)
130{
131    char value[PROPERTY_VALUE_MAX];
132
133    property_get("ro.config.headless", value, "0");
134    if (strcmp(value, "1") == 0)
135        headless = true;
136
137    offsets.display     = env->GetFieldID(clazz, "mDisplay", "I");
138    offsets.pixelFormat = env->GetFieldID(clazz, "mPixelFormat", "I");
139    offsets.fps         = env->GetFieldID(clazz, "mRefreshRate", "F");
140    offsets.density     = env->GetFieldID(clazz, "mDensity", "F");
141    offsets.xdpi        = env->GetFieldID(clazz, "mDpiX", "F");
142    offsets.ydpi        = env->GetFieldID(clazz, "mDpiY", "F");
143}
144
145int register_android_view_Display(JNIEnv* env)
146{
147    return AndroidRuntime::registerNativeMethods(env,
148            kClassPathName, gMethods, NELEM(gMethods));
149}
150
151};
152