internal/ui: implement (*Monitor).Size for mobiles

Closes #2935
This commit is contained in:
Hajime Hoshi 2024-09-16 17:42:05 +09:00
parent 4a10702f6c
commit 9a8d6e7b41
4 changed files with 105 additions and 47 deletions

View File

@ -18,15 +18,19 @@ package ui
#include <jni.h>
#include <stdlib.h>
// Basically same as:
// The following JNI code works as this pseudo Java code:
//
// WindowService windowService = context.getSystemService(Context.WINDOW_SERVICE);
// Display display = windowManager.getDefaultDisplay();
// DisplayMetrics displayMetrics = new DisplayMetrics();
// display.getRealMetrics(displayMetrics);
// this.deviceScale = displayMetrics.density;
// return displayMetrics.widthPixels, displayMetrics.heightPixels, displayMetrics.density;
//
static float deviceScale(uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
static void displayInfo(int* width, int* height, float* scale, uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
*width = 0;
*height = 0;
*scale = 1;
JavaVM* vm = (JavaVM*)java_vm;
JNIEnv* env = (JNIEnv*)jni_env;
jobject context = (jobject)ctx;
@ -64,7 +68,15 @@ static float deviceScale(uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
env, display,
(*env)->GetMethodID(env, android_view_Display, "getRealMetrics", "(Landroid/util/DisplayMetrics;)V"),
displayMetrics);
const float density =
*width =
(*env)->GetIntField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "widthPixels", "I"));
*height =
(*env)->GetIntField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "heightPixels", "I"));
*scale =
(*env)->GetFloatField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "density", "F"));
@ -78,15 +90,12 @@ static float deviceScale(uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
(*env)->DeleteLocalRef(env, windowManager);
(*env)->DeleteLocalRef(env, display);
(*env)->DeleteLocalRef(env, displayMetrics);
return density;
}
*/
import "C"
import (
"errors"
"fmt"
"github.com/ebitengine/gomobile/app"
@ -119,18 +128,27 @@ func (*graphicsDriverCreatorImpl) newPlayStation5() (graphicsdriver.Graphics, er
return nil, errors.New("ui: PlayStation 5 is not supported in this environment")
}
func (u *UserInterface) deviceScaleFactor() float64 {
var s float64
if err := app.RunOnJVM(func(vm, env, ctx uintptr) error {
// TODO: This might be crash when this is called from init(). How can we detect this?
s = float64(C.deviceScale(C.uintptr_t(vm), C.uintptr_t(env), C.uintptr_t(ctx)))
return nil
}); err != nil {
panic(fmt.Sprintf("devicescale: error %v", err))
}
return s
}
func dipToNativePixels(x float64, scale float64) float64 {
return x * scale
}
func dipFromNativePixels(x float64, scale float64) float64 {
return x / scale
}
func (u *UserInterface) displayInfo() (int, int, float64, bool) {
var cWidth, cHeight C.int
var cScale C.float
if err := app.RunOnJVM(func(vm, env, ctx uintptr) error {
C.displayInfo(&cWidth, &cHeight, &cScale, C.uintptr_t(vm), C.uintptr_t(env), C.uintptr_t(ctx))
return nil
}); err != nil {
// JVM is not ready yet.
// TODO: Fix gomobile to detect the error type for this case.
return 0, 0, 1, false
}
scale := float64(cScale)
width := int(dipFromNativePixels(float64(cWidth), scale))
height := int(dipFromNativePixels(float64(cHeight), scale))
return width, height, scale, true
}

View File

@ -19,31 +19,43 @@ package ui
//
// #import <UIKit/UIKit.h>
//
// static double devicePixelRatioOnMainThread(UIView* view) {
// static void displayInfoOnMainThread(float* width, float* height, float* scale, UIView* view) {
// *width = 0;
// *height = 0;
// *scale = 1;
// UIWindow* window = view.window;
// if (!window) {
// return 1;
// return;
// }
// UIWindowScene* scene = window.windowScene;
// if (!scene) {
// return 1;
// return;
// }
// return scene.screen.nativeScale;
// CGRect bounds = scene.screen.bounds;
// *width = bounds.size.width;
// *height = bounds.size.height;
// *scale = scene.screen.nativeScale;
// }
//
// static double devicePixelRatio(uintptr_t viewPtr) {
// static void displayInfo(float* width, float* height, float* scale, uintptr_t viewPtr) {
// *width = 0;
// *height = 0;
// *scale = 1;
// if (!viewPtr) {
// return 1;
// return;
// }
// UIView* view = (__bridge UIView*)(void*)viewPtr;
// if ([NSThread isMainThread]) {
// return devicePixelRatioOnMainThread(view);
// displayInfoOnMainThread(width, height, scale, view);
// return;
// }
// __block double scale;
// __block float w, h, s;
// dispatch_sync(dispatch_get_main_queue(), ^{
// scale = devicePixelRatioOnMainThread(view);
// displayInfoOnMainThread(&w, &h, &s, view);
// });
// return scale;
// *width = w;
// *height = h;
// *scale = s;
// }
import "C"
@ -113,10 +125,24 @@ func (u *UserInterface) IsGL() (bool, error) {
return u.GraphicsLibrary() == GraphicsLibraryOpenGL, nil
}
func (u *UserInterface) deviceScaleFactor() float64 {
return float64(C.devicePixelRatio(C.uintptr_t(u.uiView.Load())))
}
func dipToNativePixels(x float64, scale float64) float64 {
return x
}
func dipFromNativePixels(x float64, scale float64) float64 {
return x
}
func (u *UserInterface) displayInfo() (int, int, float64, bool) {
view := u.uiView.Load()
if view == 0 {
return 0, 0, 1, false
}
var cWidth, cHeight, cScale C.float
C.displayInfo(&cWidth, &cHeight, &cScale, C.uintptr_t(view))
scale := float64(cScale)
width := int(dipFromNativePixels(float64(cWidth), scale))
height := int(dipFromNativePixels(float64(cHeight), scale))
return width, height, scale, true
}

View File

@ -268,8 +268,10 @@ func (u *UserInterface) Window() Window {
}
type Monitor struct {
width int
height int
deviceScaleFactor float64
deviceScaleFactorOnce sync.Once
inited atomic.Bool
m sync.Mutex
}
@ -280,22 +282,35 @@ func (m *Monitor) Name() string {
return ""
}
func (m *Monitor) DeviceScaleFactor() float64 {
func (m *Monitor) ensureInit() {
if m.inited.Load() {
return
}
m.m.Lock()
defer m.m.Unlock()
// Re-check the state since the state might be changed while locking.
if m.inited.Load() {
return
}
width, height, scale, ok := theUI.displayInfo()
if !ok {
return
}
m.width = width
m.height = height
m.deviceScaleFactor = scale
m.inited.Store(true)
}
// The device scale factor can be obtained after the main function starts, especially on Android.
// Initialize this lazily.
m.deviceScaleFactorOnce.Do(func() {
// Assume that the device scale factor never changes on mobiles.
m.deviceScaleFactor = theUI.deviceScaleFactor()
})
func (m *Monitor) DeviceScaleFactor() float64 {
m.ensureInit()
return m.deviceScaleFactor
}
func (m *Monitor) Size() (int, int) {
// TODO: Return a valid value.
return 0, 0
m.ensureInit()
return m.width, m.height
}
func (u *UserInterface) AppendMonitors(mons []*Monitor) []*Monitor {

View File

@ -32,8 +32,7 @@ func (m *MonitorType) Name() string {
// DeviceScaleFactor returns a meaningful value on high-DPI display environment,
// otherwise DeviceScaleFactor returns 1.
//
// DeviceScaleFactor might panic on init function on some devices like Android.
// Then, it is not recommended to call DeviceScaleFactor from init functions.
// On mobiles, DeviceScaleFactor returns 1 before the game starts e.g. in init functions.
func (m *MonitorType) DeviceScaleFactor() float64 {
return (*ui.Monitor)(m).DeviceScaleFactor()
}
@ -42,7 +41,7 @@ func (m *MonitorType) DeviceScaleFactor() float64 {
// This is the same as the screen size in fullscreen mode.
// The returned value can be given to SetSize function if the perfectly fit fullscreen is needed.
//
// On mobiles, Size returns (0, 0) so far.
// On mobiles, Size returns (0, 0) before the game starts e.g. in init functions.
//
// Size's use cases are limited. If you are making a fullscreen application, you can use RunGame and
// the Game interface's Layout function instead. If you are making a not-fullscreen application but the application's