mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-24 18:58:54 +01:00
145 lines
3.4 KiB
Go
145 lines
3.4 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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// +build !js
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package ui
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import (
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"fmt"
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"syscall"
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"unsafe"
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"github.com/go-gl/glfw/v3.2/glfw"
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"github.com/hajimehoshi/ebiten/internal/devicescale"
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)
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const (
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smCyCaption = 4
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monitorDefaultToNearest = 2
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)
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type rect struct {
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left int32
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top int32
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right int32
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bottom int32
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}
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type monitorInfo struct {
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cbSize uint32
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rcMonitor rect
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rcWork rect
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dwFlags uint32
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}
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var (
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// user32 is defined at hideconsole_windows.go
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procGetSystemMetrics = user32.NewProc("GetSystemMetrics")
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procGetActiveWindow = user32.NewProc("GetActiveWindow")
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procMonitorFromWindow = user32.NewProc("MonitorFromWindow")
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procGetMonitorInfoW = user32.NewProc("GetMonitorInfoW")
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)
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func getSystemMetrics(nIndex int) (int, error) {
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r, _, e := syscall.Syscall(procGetSystemMetrics.Addr(), 1, uintptr(nIndex), 0, 0)
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if e != 0 {
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return 0, fmt.Errorf("ui: GetSystemMetrics failed: error code: %d", e)
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}
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return int(r), nil
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}
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func getActiveWindow() (uintptr, error) {
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r, _, e := syscall.Syscall(procGetActiveWindow.Addr(), 0, 0, 0, 0)
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if e != 0 {
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return 0, fmt.Errorf("ui: GetActiveWindow failed: error code: %d", e)
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}
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return r, nil
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}
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func monitorFromWindow(hwnd uintptr, dwFlags uint32) (uintptr, error) {
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r, _, e := syscall.Syscall(procMonitorFromWindow.Addr(), 2, hwnd, uintptr(dwFlags), 0)
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if e != 0 {
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return 0, fmt.Errorf("ui: MonitorFromWindow failed: error code: %d", e)
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}
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if r == 0 {
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return 0, fmt.Errorf("ui: MonitorFromWindow failed: returned value: %d", r)
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}
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return r, nil
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}
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func getMonitorInfoW(hMonitor uintptr, lpmi *monitorInfo) error {
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r, _, e := syscall.Syscall(procGetMonitorInfoW.Addr(), 2, hMonitor, uintptr(unsafe.Pointer(lpmi)), 0)
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if e != 0 {
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return fmt.Errorf("ui: GetMonitorInfoW failed: error code: %d", e)
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}
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if r == 0 {
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return fmt.Errorf("ui: GetMonitorInfoW failed: returned value: %d", r)
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}
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return nil
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}
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func glfwScale() float64 {
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// This function must be called on the main thread.
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return devicescale.GetAt(currentUI.currentMonitor().GetPos())
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}
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func adjustWindowPosition(x, y int) (int, int) {
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// As the video width/height might be wrong,
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// adjust x/y at least to enable to handle the window (#328)
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if x < 0 {
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x = 0
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}
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t, err := getSystemMetrics(smCyCaption)
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if err != nil {
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panic(err)
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}
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if y < t {
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y = t
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}
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return x, y
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}
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func currentMonitor() *glfw.Monitor {
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w, err := getActiveWindow()
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if err != nil {
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panic(err)
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}
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if w == 0 {
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// There is no window at launching.
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return glfw.GetPrimaryMonitor()
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}
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m, err := monitorFromWindow(w, monitorDefaultToNearest)
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if err != nil {
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panic(err)
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}
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mi := monitorInfo{}
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mi.cbSize = uint32(unsafe.Sizeof(mi))
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if err := getMonitorInfoW(m, &mi); err != nil {
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panic(err)
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}
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x, y := int(mi.rcMonitor.left), int(mi.rcMonitor.top)
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for _, m := range glfw.GetMonitors() {
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mx, my := m.GetPos()
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if mx == x && my == y {
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return m
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}
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}
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return nil
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}
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