mirror of
https://github.com/hajimehoshi/ebiten.git
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106 lines
3.6 KiB
Go
106 lines
3.6 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package devicescale
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/*
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#include <jni.h>
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#include <stdlib.h>
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// Basically same as:
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//
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// WindowService windowService = context.getSystemService(Context.WINDOW_SERVICE);
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// Display display = windowManager.getDefaultDisplay();
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// DisplayMetrics displayMetrics = new DisplayMetrics();
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// display.getRealMetrics(displayMetrics);
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// this.deviceScale = displayMetrics.density;
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//
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static float deviceScale(uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
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JavaVM* vm = (JavaVM*)java_vm;
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JNIEnv* env = (JNIEnv*)jni_env;
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jobject context = (jobject)ctx;
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const char* kWindowService = "window";
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const jclass android_content_Context =
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(*env)->FindClass(env, "android/content/Context");
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const jclass android_view_WindowManager =
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(*env)->FindClass(env, "android/view/WindowManager");
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const jclass android_view_Display =
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(*env)->FindClass(env, "android/view/Display");
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const jclass android_util_DisplayMetrics =
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(*env)->FindClass(env, "android/util/DisplayMetrics");
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const jobject android_context_Context_WINDOW_SERVICE =
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(*env)->GetStaticObjectField(
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env, android_content_Context,
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(*env)->GetStaticFieldID(env, android_content_Context, "WINDOW_SERVICE", "Ljava/lang/String;"));
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const jobject windowManager =
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(*env)->CallObjectMethod(
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env, context,
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(*env)->GetMethodID(env, android_content_Context, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;"),
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android_context_Context_WINDOW_SERVICE);
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const jobject display =
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(*env)->CallObjectMethod(
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env, windowManager,
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(*env)->GetMethodID(env, android_view_WindowManager, "getDefaultDisplay", "()Landroid/view/Display;"));
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const jobject displayMetrics =
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(*env)->NewObject(
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env, android_util_DisplayMetrics,
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(*env)->GetMethodID(env, android_util_DisplayMetrics, "<init>", "()V"));
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(*env)->CallVoidMethod(
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env, display,
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(*env)->GetMethodID(env, android_view_Display, "getRealMetrics", "(Landroid/util/DisplayMetrics;)V"),
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displayMetrics);
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const float density =
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(*env)->GetFloatField(
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env, displayMetrics,
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(*env)->GetFieldID(env, android_util_DisplayMetrics, "density", "F"));
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(*env)->DeleteLocalRef(env, android_content_Context);
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(*env)->DeleteLocalRef(env, android_view_WindowManager);
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(*env)->DeleteLocalRef(env, android_view_Display);
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(*env)->DeleteLocalRef(env, android_util_DisplayMetrics);
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(*env)->DeleteLocalRef(env, android_context_Context_WINDOW_SERVICE);
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(*env)->DeleteLocalRef(env, windowManager);
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(*env)->DeleteLocalRef(env, display);
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(*env)->DeleteLocalRef(env, displayMetrics);
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return density;
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}
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*/
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import "C"
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import (
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"fmt"
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"golang.org/x/mobile/app"
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)
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func impl(x, y int) float64 {
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s := 0.0
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if err := app.RunOnJVM(func(vm, env, ctx uintptr) error {
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// TODO: This might be crash when this is called from init(). How can we detect this?
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s = float64(C.deviceScale(C.uintptr_t(vm), C.uintptr_t(env), C.uintptr_t(ctx)))
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return nil
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}); err != nil {
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panic(fmt.Sprintf("devicescale: error %v", err))
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}
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return s
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}
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