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      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 <surfaceflinger/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 
     30 namespace android {
     31 
     32 // ----------------------------------------------------------------------------
     33 
     34 struct offsets_t {
     35     jfieldID display;
     36     jfieldID pixelFormat;
     37     jfieldID fps;
     38     jfieldID density;
     39     jfieldID xdpi;
     40     jfieldID ydpi;
     41 };
     42 static offsets_t offsets;
     43 
     44 static 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 
     52 static 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 
     68 static 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 
     75 static 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 
     82 static 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 
     89 static jint android_view_Display_getDisplayCount(
     90         JNIEnv* env, jclass clazz)
     91 {
     92     return SurfaceComposerClient::getNumberOfDisplays();
     93 }
     94 
     95 // ----------------------------------------------------------------------------
     96 
     97 const char* const kClassPathName = "android/view/Display";
     98 
     99 static void nativeClassInit(JNIEnv* env, jclass clazz);
    100 
    101 static 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 
    116 void 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 
    126 int register_android_view_Display(JNIEnv* env)
    127 {
    128     return AndroidRuntime::registerNativeMethods(env,
    129             kClassPathName, gMethods, NELEM(gMethods));
    130 }
    131 
    132 };
    133 
    134