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77 lines
2.5 KiB
Go
77 lines
2.5 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 `getResources().getDisplayMetrics().density`;
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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 jclass android_content_ContextWrapper =
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(*env)->FindClass(env, "android/content/ContextWrapper");
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const jclass android_content_res_Resources =
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(*env)->FindClass(env, "android/content/res/Resources");
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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 resources =
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(*env)->CallObjectMethod(
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env, context,
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(*env)->GetMethodID(env, android_content_ContextWrapper, "getResources", "()Landroid/content/res/Resources;"));
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const jobject displayMetrics =
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(*env)->CallObjectMethod(
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env, resources,
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(*env)->GetMethodID(env, android_content_res_Resources, "getDisplayMetrics", "()Landroid/util/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_ContextWrapper);
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(*env)->DeleteLocalRef(env, android_content_res_Resources);
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(*env)->DeleteLocalRef(env, android_util_DisplayMetrics);
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(*env)->DeleteLocalRef(env, resources);
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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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