mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-24 18:58:54 +01:00
75 lines
2.2 KiB
Go
75 lines
2.2 KiB
Go
// Copyright 2016 Hajime Hoshi
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package ui
|
|
|
|
/*
|
|
|
|
#include <jni.h>
|
|
#include <stdlib.h>
|
|
|
|
// Basically same as `getResources().getDisplayMetrics().density`;
|
|
static float deviceScale(uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
|
|
JavaVM* vm = (JavaVM*)java_vm;
|
|
JNIEnv* env = (JNIEnv*)jni_env;
|
|
jobject context = (jobject)ctx;
|
|
|
|
const jclass android_content_ContextWrapper =
|
|
(*env)->FindClass(env, "android/content/ContextWrapper");
|
|
const jclass android_content_res_Resources =
|
|
(*env)->FindClass(env, "android/content/res/Resources");
|
|
const jclass android_util_DisplayMetrics =
|
|
(*env)->FindClass(env, "android/util/DisplayMetrics");
|
|
|
|
const jobject resources =
|
|
(*env)->CallObjectMethod(
|
|
env, context,
|
|
(*env)->GetMethodID(env, android_content_ContextWrapper, "getResources", "()Landroid/content/res/Resources;"));
|
|
const jobject displayMetrics =
|
|
(*env)->CallObjectMethod(
|
|
env, resources,
|
|
(*env)->GetMethodID(env, android_content_res_Resources, "getDisplayMetrics", "()Landroid/util/DisplayMetrics;"));
|
|
const float density =
|
|
(*env)->GetFloatField(
|
|
env, displayMetrics,
|
|
(*env)->GetFieldID(env, android_util_DisplayMetrics, "density", "F"));
|
|
return density;
|
|
}
|
|
|
|
*/
|
|
import "C"
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/hajimehoshi/ebiten/internal/jni"
|
|
)
|
|
|
|
var (
|
|
androidDeviceScale = 0.0
|
|
)
|
|
|
|
func deviceScale() float64 {
|
|
if 0 < androidDeviceScale {
|
|
return androidDeviceScale
|
|
}
|
|
if err := jni.RunOnJVM(func(vm, env, ctx uintptr) error {
|
|
androidDeviceScale = float64(C.deviceScale(C.uintptr_t(vm), C.uintptr_t(env), C.uintptr_t(ctx)))
|
|
return nil
|
|
}); err != nil {
|
|
panic(fmt.Sprintf("ui: error %v", err))
|
|
}
|
|
return androidDeviceScale
|
|
}
|