//go:build windows
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package overlay
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import (
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"math"
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"runtime"
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"syscall"
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"time"
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"unsafe"
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)
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// ---- Win32 constants ----
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const (
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wsPopup = 0x80000000
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wsExLayered = 0x00080000
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wsExTopmost = 0x00000008
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wsExToolWindow = 0x00000080
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wsExTransparent = 0x00000020
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wsExNoActivate = 0x08000000
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swShow = 5
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swHide = 0
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ulwAlpha = 0x02
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acSrcOver = 0x00
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acSrcAlpha = 0x01
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pmRemove = 0x0001
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swpNoSize = 0x0001
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swpNoZOrder = 0x0004
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swpNoActivate = 0x0010
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// Window messages for drag
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wmMove = 0x0003
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wmNCHitTest = 0x0084
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wmEnterSizeMove = 0x0231
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wmExitSizeMove = 0x0232
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htCaption = 2
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)
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// GDI+ constants
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const (
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smoothingAntiAlias8x8 = 5
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textHintAntiAlias = 4
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unitPixel = 2
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fontStyleRegular = 0
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fillModeAlternate = 0
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strAlignNear = 0
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strAlignCenter = 1
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)
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// Colors (ARGB)
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const (
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clrCapsuleBG = 0xD91C1C1E
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clrBorder = 0x20FFFFFF
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clrText = 0xFFB4B4B4
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clrBlue = 0xFF007AFF
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clrGreen = 0xFF34C759
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clrRed = 0xFFFF3B30
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clrOrange = 0xFFFF9500
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)
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// Dimensions (logical px)
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const (
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capW = 170
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capH = 48
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capR = 24
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barW = 5
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barGap = 4
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barR = 2.5
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nBars = 5
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txtSz = 12.0
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txtGap = 12
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)
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// ---- Win32 structs ----
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type wPoint struct{ x, y int32 }
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type wSize struct{ cx, cy int32 }
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type wBlend struct{ op, flags, srcAlpha, alphaFmt byte }
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type wBmpInfoHdr struct {
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biSize, biWidth, biHeight int32
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biPlanes, biBitCount uint16
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biCompression uint32
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biSizeImage uint32
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biXPPM, biYPPM int32
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biClrUsed, biClrImportant uint32
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}
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type wBmpInfo struct {
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hdr wBmpInfoHdr
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colors [1]uint32
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}
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type wMsg struct {
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hwnd uintptr
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message uint32
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wParam uintptr
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lParam uintptr
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time uint32
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pt wPoint
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}
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type wWndClassEx struct {
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cbSize uint32
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style uint32
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wndProc uintptr
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clsExtra int32
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wndExtra int32
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hInstance uintptr
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hIcon uintptr
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hCursor uintptr
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hbrBg uintptr
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menuName *uint16
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className *uint16
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hIconSm uintptr
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}
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type gdipSI struct {
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ver uint32
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debugCb uintptr
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noThread int32
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noCodecs int32
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}
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type rectF struct{ x, y, w, h float32 }
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// ---- DLL procs ----
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var (
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user32 = syscall.NewLazyDLL("user32.dll")
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gdi32 = syscall.NewLazyDLL("gdi32.dll")
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kernel32 = syscall.NewLazyDLL("kernel32.dll")
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gdipDLL = syscall.NewLazyDLL("gdiplus.dll")
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uRegisterClassEx = user32.NewProc("RegisterClassExW")
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uCreateWindowEx = user32.NewProc("CreateWindowExW")
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uDestroyWindow = user32.NewProc("DestroyWindow")
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uShowWindow = user32.NewProc("ShowWindow")
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uSetWindowPos = user32.NewProc("SetWindowPos")
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uUpdateLayeredWin = user32.NewProc("UpdateLayeredWindow")
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uDefWindowProc = user32.NewProc("DefWindowProcW")
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uGetDC = user32.NewProc("GetDC")
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uReleaseDC = user32.NewProc("ReleaseDC")
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uPeekMessage = user32.NewProc("PeekMessageW")
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uTranslateMessage = user32.NewProc("TranslateMessage")
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uDispatchMessage = user32.NewProc("DispatchMessageW")
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kGetModuleHandle = kernel32.NewProc("GetModuleHandleW")
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gCreateCompatibleDC = gdi32.NewProc("CreateCompatibleDC")
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gDeleteDC = gdi32.NewProc("DeleteDC")
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gCreateDIBSection = gdi32.NewProc("CreateDIBSection")
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gSelectObject = gdi32.NewProc("SelectObject")
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gDeleteObject = gdi32.NewProc("DeleteObject")
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gpStartup = gdipDLL.NewProc("GdiplusStartup")
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gpShutdown = gdipDLL.NewProc("GdiplusShutdown")
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gpFromHDC = gdipDLL.NewProc("GdipCreateFromHDC")
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gpDeleteGraphics = gdipDLL.NewProc("GdipDeleteGraphics")
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gpSetSmoothing = gdipDLL.NewProc("GdipSetSmoothingMode")
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gpSetTextHint = gdipDLL.NewProc("GdipSetTextRenderingHint")
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gpClear = gdipDLL.NewProc("GdipGraphicsClear")
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gpCreateSolidFill = gdipDLL.NewProc("GdipCreateSolidFill")
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gpDeleteBrush = gdipDLL.NewProc("GdipDeleteBrush")
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gpCreatePath = gdipDLL.NewProc("GdipCreatePath")
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gpDeletePath = gdipDLL.NewProc("GdipDeletePath")
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gpAddPathArc = gdipDLL.NewProc("GdipAddPathArc")
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gpClosePathFigure = gdipDLL.NewProc("GdipClosePathFigure")
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gpFillPath = gdipDLL.NewProc("GdipFillPath")
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gpDrawPath = gdipDLL.NewProc("GdipDrawPath")
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gpCreatePen = gdipDLL.NewProc("GdipCreatePen1")
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gpDeletePen = gdipDLL.NewProc("GdipDeletePen")
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gpCreateFontFamily = gdipDLL.NewProc("GdipCreateFontFamilyFromName")
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gpDeleteFontFamily = gdipDLL.NewProc("GdipDeleteFontFamily")
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gpCreateFont = gdipDLL.NewProc("GdipCreateFont")
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gpDeleteFont = gdipDLL.NewProc("GdipDeleteFont")
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gpCreateStrFmt = gdipDLL.NewProc("GdipCreateStringFormat")
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gpDeleteStrFmt = gdipDLL.NewProc("GdipDeleteStringFormat")
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gpSetStrFmtAlign = gdipDLL.NewProc("GdipSetStringFormatAlign")
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gpSetStrFmtLineAl = gdipDLL.NewProc("GdipSetStringFormatLineAlign")
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gpDrawString = gdipDLL.NewProc("GdipDrawString")
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gpMeasureString = gdipDLL.NewProc("GdipMeasureString")
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)
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// getSystemDPI returns the system DPI (96 = 100%, 120 = 125%, 144 = 150%, 192 = 200%).
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func getSystemDPI() int {
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// Try GetDpiForSystem (Win10 1607+, user32.dll)
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proc := user32.NewProc("GetDpiForSystem")
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if err := proc.Find(); err == nil {
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dpi, _, _ := proc.Call()
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if dpi > 0 {
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return int(dpi)
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}
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}
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// Fallback: GetDeviceCaps(LOGPIXELSX) — works on all Windows versions
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hdc, _, _ := uGetDC.Call(0)
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if hdc != 0 {
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defer uReleaseDC.Call(0, hdc)
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getDeviceCaps := gdi32.NewProc("GetDeviceCaps")
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dpi, _, _ := getDeviceCaps.Call(hdc, 88) // LOGPIXELSX = 88
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if dpi > 0 {
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return int(dpi)
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}
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}
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return 96
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}
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// f32 converts float32 to uintptr (for GDI+ flat API syscalls).
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func f32(v float32) uintptr { return uintptr(math.Float32bits(v)) }
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var gOverlay *winOverlay
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func overlayWndProc(hwnd uintptr, msg uint32, wp, lp uintptr) uintptr {
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o := gOverlay
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switch msg {
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case wmNCHitTest:
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return htCaption
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case wmEnterSizeMove:
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if o != nil {
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o.dragging = true
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}
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case wmExitSizeMove:
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if o != nil {
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o.dragging = false
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if o.dragCb != nil {
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x, y := o.posX, o.posY
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go o.dragCb(x, y)
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}
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}
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case wmMove:
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if o != nil && o.dragging {
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o.posX = int(int16(lp & 0xFFFF))
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o.posY = int(int16((lp >> 16) & 0xFFFF))
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}
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}
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r, _, _ := uDefWindowProc.Call(hwnd, uintptr(msg), wp, lp)
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return r
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}
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func statusColor(s Status) uint32 {
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switch s {
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case StatusLoading:
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return clrBlue
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case StatusReady, StatusDone:
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return clrGreen
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case StatusRecording, StatusError:
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return clrRed
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case StatusFreetalking:
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return clrBlue
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case StatusProcessing, StatusCancelled, StatusNoVoice, StatusNoContent:
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return clrOrange
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default:
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return clrBlue
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}
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}
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// ---- Overlay struct ----
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type statusCmd struct {
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status Status
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text string
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}
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type winOverlay struct {
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showCh chan bool
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statusCh chan statusCmd
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volCh chan float64
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posCh chan [2]int
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closeCh chan struct{}
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done chan struct{}
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barHeights [nBars]float64
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animTime float64
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// Position & drag
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posX, posY int
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dragging bool
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dragCb func(x, y int)
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// DPI-scaled dimensions (set once in run())
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scale float64
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sW, sH int32 // scaled window width, height
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sCapR float64 // scaled corner radius
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sBarW float64 // scaled bar width
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sBarGap float64 // scaled bar gap
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sBarR float64 // scaled bar radius
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sTxtSz float32 // scaled font size
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sTxtGap float64 // scaled text gap
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}
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func New() Overlay {
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o := &winOverlay{
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showCh: make(chan bool, 8),
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statusCh: make(chan statusCmd, 8),
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volCh: make(chan float64, 32),
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posCh: make(chan [2]int, 8),
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closeCh: make(chan struct{}),
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done: make(chan struct{}),
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}
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for i := range o.barHeights {
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o.barHeights[i] = 14
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}
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go o.run()
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return o
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}
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func (o *winOverlay) Show() { trySend(o.showCh, true) }
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func (o *winOverlay) Hide() { trySend(o.showCh, false) }
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func (o *winOverlay) SetStatus(s Status, text string) { trySendS(o.statusCh, statusCmd{s, text}) }
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func (o *winOverlay) SetVolume(vol float64) { trySendF(o.volCh, vol) }
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func (o *winOverlay) SetPosition(x, y int) { trySendP(o.posCh, [2]int{x, y}) }
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func (o *winOverlay) GetPosition() (int, int) { return o.posX, o.posY }
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func (o *winOverlay) Size() (int, int) { return capW, capH }
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func (o *winOverlay) OnDragged(fn func(x, y int)) { o.dragCb = fn }
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func (o *winOverlay) Close() { close(o.closeCh); <-o.done }
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func trySend(ch chan bool, v bool) {
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select {
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case ch <- v:
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default:
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}
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}
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func trySendS(ch chan statusCmd, v statusCmd) {
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select {
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case ch <- v:
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default:
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}
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}
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func trySendF(ch chan float64, v float64) {
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select {
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case ch <- v:
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default:
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}
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}
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func trySendP(ch chan [2]int, v [2]int) {
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select {
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case ch <- v:
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default:
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}
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}
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// ---- Main render thread ----
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func (o *winOverlay) run() {
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defer close(o.done)
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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// GDI+ init
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var token uintptr
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si := gdipSI{ver: 1}
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gpStartup.Call(uintptr(unsafe.Pointer(&token)), uintptr(unsafe.Pointer(&si)), 0)
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defer gpShutdown.Call(token)
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gOverlay = o
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// Compute DPI-scaled dimensions
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o.scale = float64(getSystemDPI()) / 96.0
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o.sW = int32(math.Round(float64(capW) * o.scale))
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o.sH = int32(math.Round(float64(capH) * o.scale))
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o.sCapR = capR * o.scale
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o.sBarW = barW * o.scale
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o.sBarGap = barGap * o.scale
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o.sBarR = barR * o.scale
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o.sTxtSz = float32(txtSz * o.scale)
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o.sTxtGap = txtGap * o.scale
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// Register window class
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hInst, _, _ := kGetModuleHandle.Call(0)
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cls, _ := syscall.UTF16PtrFromString("PrivateVoiceInputOverlay")
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wc := wWndClassEx{
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cbSize: uint32(unsafe.Sizeof(wWndClassEx{})),
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wndProc: syscall.NewCallback(overlayWndProc),
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hInstance: hInst,
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className: cls,
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}
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uRegisterClassEx.Call(uintptr(unsafe.Pointer(&wc)))
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// Create layered window
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exStyle := uintptr(wsExLayered | wsExTopmost | wsExToolWindow | wsExNoActivate)
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hwnd, _, _ := uCreateWindowEx.Call(
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exStyle, uintptr(unsafe.Pointer(cls)), 0, wsPopup,
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0, 0, uintptr(o.sW), uintptr(o.sH), 0, 0, hInst, 0,
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)
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if hwnd == 0 {
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return
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}
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defer uDestroyWindow.Call(hwnd)
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// Memory DC + DIB
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screenDC, _, _ := uGetDC.Call(0)
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defer uReleaseDC.Call(0, screenDC)
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memDC, _, _ := gCreateCompatibleDC.Call(screenDC)
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defer gDeleteDC.Call(memDC)
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bi := wBmpInfo{hdr: wBmpInfoHdr{
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biSize: int32(unsafe.Sizeof(wBmpInfoHdr{})),
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biWidth: o.sW,
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biHeight: -o.sH, // top-down
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biPlanes: 1, biBitCount: 32,
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}}
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var bits unsafe.Pointer
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hBmp, _, _ := gCreateDIBSection.Call(memDC, uintptr(unsafe.Pointer(&bi)), 0, uintptr(unsafe.Pointer(&bits)), 0, 0)
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if hBmp == 0 {
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return
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}
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defer gDeleteObject.Call(hBmp)
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gSelectObject.Call(memDC, hBmp)
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// GDI+ font + string format
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var fontFamily, font, strFmt uintptr
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fn, _ := syscall.UTF16PtrFromString("Segoe UI")
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gpCreateFontFamily.Call(uintptr(unsafe.Pointer(fn)), 0, uintptr(unsafe.Pointer(&fontFamily)))
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if fontFamily != 0 {
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gpCreateFont.Call(fontFamily, f32(o.sTxtSz), fontStyleRegular, unitPixel, uintptr(unsafe.Pointer(&font)))
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}
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gpCreateStrFmt.Call(0, 0, uintptr(unsafe.Pointer(&strFmt)))
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if strFmt != 0 {
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gpSetStrFmtAlign.Call(strFmt, strAlignNear)
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gpSetStrFmtLineAl.Call(strFmt, strAlignCenter)
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}
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defer func() {
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if strFmt != 0 {
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gpDeleteStrFmt.Call(strFmt)
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}
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if font != 0 {
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gpDeleteFont.Call(font)
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}
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if fontFamily != 0 {
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gpDeleteFontFamily.Call(fontFamily)
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}
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}()
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// State
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const (
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fadeInSpeed = 0.16 // per frame, ~200ms total
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fadeOutSpeed = 0.22 // per frame, ~150ms total
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fadeSlide = 8 // px vertical slide
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)
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var (
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visible bool
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status Status = StatusHidden
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text string
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barClr uint32 = clrBlue
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volumes [nBars]float64
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fadeProgress float64 // 0 = hidden, 1 = fully visible
|
fadeTarget float64 // 0 or 1
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)
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ticker := time.NewTicker(33 * time.Millisecond) // ~30fps
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defer ticker.Stop()
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for {
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// Drain Win32 messages
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var m wMsg
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for {
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ret, _, _ := uPeekMessage.Call(uintptr(unsafe.Pointer(&m)), 0, 0, 0, pmRemove)
|
if ret == 0 {
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break
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}
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uTranslateMessage.Call(uintptr(unsafe.Pointer(&m)))
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uDispatchMessage.Call(uintptr(unsafe.Pointer(&m)))
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}
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// Process commands
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for drain := true; drain; {
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select {
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case <-o.closeCh:
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return
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case show := <-o.showCh:
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if show {
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fadeTarget = 1.0
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if !visible {
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visible = true
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uShowWindow.Call(hwnd, swShow)
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}
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} else {
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fadeTarget = 0.0
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}
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case cmd := <-o.statusCh:
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status = cmd.status
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text = cmd.text
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barClr = statusColor(cmd.status)
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case vol := <-o.volCh:
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copy(volumes[0:4], volumes[1:5])
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volumes[4] = vol
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case pos := <-o.posCh:
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o.posX, o.posY = pos[0], pos[1]
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uSetWindowPos.Call(hwnd, 0, uintptr(o.posX), uintptr(o.posY), 0, 0,
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swpNoSize|swpNoZOrder|swpNoActivate)
|
default:
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drain = false
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}
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}
|
|
select {
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case <-o.closeCh:
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return
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case <-ticker.C:
|
}
|
|
if !visible {
|
continue
|
}
|
|
// Update fade progress
|
if fadeProgress < fadeTarget {
|
fadeProgress += fadeInSpeed
|
if fadeProgress > 1.0 {
|
fadeProgress = 1.0
|
}
|
} else if fadeProgress > fadeTarget {
|
fadeProgress -= fadeOutSpeed
|
if fadeProgress < 0.0 {
|
fadeProgress = 0.0
|
}
|
}
|
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// Fully faded out → hide window
|
if fadeProgress <= 0 && fadeTarget == 0 {
|
visible = false
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uShowWindow.Call(hwnd, swHide)
|
continue
|
}
|
|
// Ease-out curve for smoother feel
|
eased := fadeProgress * (2 - fadeProgress)
|
|
// Slide offset: float up on show, sink down on hide (skip during user drag)
|
if !o.dragging {
|
slideY := int(float64(1.0-eased) * fadeSlide)
|
if slideY != 0 {
|
uSetWindowPos.Call(hwnd, 0, uintptr(o.posX), uintptr(o.posY+slideY), 0, 0,
|
swpNoSize|swpNoZOrder|swpNoActivate)
|
} else if fadeProgress >= 1.0 {
|
uSetWindowPos.Call(hwnd, 0, uintptr(o.posX), uintptr(o.posY), 0, 0,
|
swpNoSize|swpNoZOrder|swpNoActivate)
|
}
|
}
|
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alpha := byte(eased * 255)
|
|
o.animTime += 0.033
|
o.animate(status, volumes)
|
o.renderFrame(memDC, hwnd, screenDC, font, strFmt, barClr, text, alpha)
|
}
|
}
|
|
// ---- Animation ----
|
|
func (o *winOverlay) animate(status Status, volumes [nBars]float64) {
|
s := o.scale
|
t := o.animTime
|
switch status {
|
case StatusLoading:
|
for i := 0; i < nBars; i++ {
|
pulse := math.Sin(t*2+float64(i)*0.3)*0.5 + 0.5
|
o.barHeights[i] = (10 + pulse*20) * s
|
}
|
case StatusReady, StatusDone:
|
for i := 0; i < nBars; i++ {
|
o.barHeights[i] = o.barHeights[i]*0.85 + 14*s*0.15
|
}
|
case StatusRecording, StatusFreetalking:
|
hasReal := false
|
for _, v := range volumes {
|
if v > 0.01 {
|
hasReal = true
|
break
|
}
|
}
|
for i := 0; i < nBars; i++ {
|
var target float64
|
if hasReal {
|
target = (8 + volumes[i]*32) * s
|
} else {
|
wave := math.Sin(t*4+float64(i)*0.8)*0.5 + 0.5
|
rnd := math.Sin(t*7+float64(i)*1.5) * 0.3
|
target = (10 + (wave+rnd)*25) * s
|
}
|
o.barHeights[i] = o.barHeights[i]*0.6 + target*0.4
|
}
|
case StatusProcessing:
|
for i := 0; i < nBars; i++ {
|
wave := math.Sin(t*3+float64(i)*0.6)*0.5 + 0.5
|
o.barHeights[i] = (12 + wave*18) * s
|
}
|
default:
|
for i := 0; i < nBars; i++ {
|
o.barHeights[i] = o.barHeights[i]*0.85 + 14*s*0.15
|
}
|
}
|
}
|
|
// ---- Rendering ----
|
|
func (o *winOverlay) renderFrame(memDC, hwnd, screenDC, font, strFmt uintptr, barClr uint32, text string, alpha byte) {
|
var gfx uintptr
|
gpFromHDC.Call(memDC, uintptr(unsafe.Pointer(&gfx)))
|
if gfx == 0 {
|
return
|
}
|
defer gpDeleteGraphics.Call(gfx)
|
|
gpSetSmoothing.Call(gfx, smoothingAntiAlias8x8)
|
gpSetTextHint.Call(gfx, textHintAntiAlias)
|
gpClear.Call(gfx, 0) // transparent
|
|
// Capsule background
|
fillRoundRect(gfx, 0, 0, float64(o.sW), float64(o.sH), o.sCapR, clrCapsuleBG)
|
|
// Inner border
|
strokeRoundRect(gfx, 0.5, 0.5, float64(o.sW)-1, float64(o.sH)-1, o.sCapR-0.5, clrBorder, 1)
|
|
// Layout: bars + optional text, centered
|
barsW := float32(float64(nBars)*o.sBarW + float64(nBars-1)*o.sBarGap)
|
var textW float32
|
if text != "" && font != 0 {
|
textW = measureText(gfx, font, strFmt, text)
|
}
|
totalW := barsW
|
if textW > 0 {
|
totalW += float32(o.sTxtGap) + textW
|
}
|
startX := (float32(o.sW) - totalW) / 2
|
|
// Bars
|
for i := 0; i < nBars; i++ {
|
bx := startX + float32(float64(i)*(o.sBarW+o.sBarGap))
|
bh := float32(o.barHeights[i])
|
if bh < float32(6*o.scale) {
|
bh = float32(6 * o.scale)
|
}
|
if bh > float32(40*o.scale) {
|
bh = float32(40 * o.scale)
|
}
|
by := (float32(o.sH) - bh) / 2
|
fillRoundRect(gfx, float64(bx), float64(by), o.sBarW, float64(bh), o.sBarR, barClr)
|
}
|
|
// Text
|
if text != "" && font != 0 && strFmt != 0 {
|
tx := startX + barsW + float32(o.sTxtGap)
|
drawText(gfx, font, strFmt, text, tx, 0, textW+4, float32(o.sH), clrText)
|
}
|
|
// UpdateLayeredWindow
|
ptSrc := wPoint{0, 0}
|
sz := wSize{o.sW, o.sH}
|
blend := wBlend{op: acSrcOver, srcAlpha: alpha, alphaFmt: acSrcAlpha}
|
uUpdateLayeredWin.Call(hwnd, screenDC, 0, uintptr(unsafe.Pointer(&sz)),
|
memDC, uintptr(unsafe.Pointer(&ptSrc)), 0, uintptr(unsafe.Pointer(&blend)), ulwAlpha)
|
}
|
|
// ---- GDI+ drawing helpers ----
|
|
func makeRoundRectPath(x, y, w, h, r float64) uintptr {
|
var path uintptr
|
gpCreatePath.Call(fillModeAlternate, uintptr(unsafe.Pointer(&path)))
|
if path == 0 {
|
return 0
|
}
|
fx, fy, fw, fh, fd := float32(x), float32(y), float32(w), float32(h), float32(r*2)
|
// top-left
|
gpAddPathArc.Call(path, f32(fx), f32(fy), f32(fd), f32(fd), f32(180), f32(90))
|
// top-right
|
gpAddPathArc.Call(path, f32(fx+fw-fd), f32(fy), f32(fd), f32(fd), f32(270), f32(90))
|
// bottom-right
|
gpAddPathArc.Call(path, f32(fx+fw-fd), f32(fy+fh-fd), f32(fd), f32(fd), f32(0), f32(90))
|
// bottom-left
|
gpAddPathArc.Call(path, f32(fx), f32(fy+fh-fd), f32(fd), f32(fd), f32(90), f32(90))
|
gpClosePathFigure.Call(path)
|
return path
|
}
|
|
func fillRoundRect(gfx uintptr, x, y, w, h, r float64, color uint32) {
|
path := makeRoundRectPath(x, y, w, h, r)
|
if path == 0 {
|
return
|
}
|
defer gpDeletePath.Call(path)
|
var brush uintptr
|
gpCreateSolidFill.Call(uintptr(color), uintptr(unsafe.Pointer(&brush)))
|
if brush == 0 {
|
return
|
}
|
defer gpDeleteBrush.Call(brush)
|
gpFillPath.Call(gfx, brush, path)
|
}
|
|
func strokeRoundRect(gfx uintptr, x, y, w, h, r float64, color uint32, width float32) {
|
path := makeRoundRectPath(x, y, w, h, r)
|
if path == 0 {
|
return
|
}
|
defer gpDeletePath.Call(path)
|
var pen uintptr
|
gpCreatePen.Call(uintptr(color), f32(width), unitPixel, uintptr(unsafe.Pointer(&pen)))
|
if pen == 0 {
|
return
|
}
|
defer gpDeletePen.Call(pen)
|
gpDrawPath.Call(gfx, pen, path)
|
}
|
|
func measureText(gfx, font, strFmt uintptr, text string) float32 {
|
u := utf16(text)
|
layout := rectF{0, 0, 500, 100}
|
var box rectF
|
gpMeasureString.Call(gfx, uintptr(unsafe.Pointer(&u[0])), uintptr(len(u)),
|
font, uintptr(unsafe.Pointer(&layout)), strFmt, uintptr(unsafe.Pointer(&box)), 0, 0)
|
return box.w
|
}
|
|
func drawText(gfx, font, strFmt uintptr, text string, x, y, w, h float32, color uint32) {
|
u := utf16(text)
|
var brush uintptr
|
gpCreateSolidFill.Call(uintptr(color), uintptr(unsafe.Pointer(&brush)))
|
if brush == 0 {
|
return
|
}
|
defer gpDeleteBrush.Call(brush)
|
layout := rectF{x, y, w, h}
|
gpDrawString.Call(gfx, uintptr(unsafe.Pointer(&u[0])), uintptr(len(u)),
|
font, uintptr(unsafe.Pointer(&layout)), strFmt, brush)
|
}
|
|
func utf16(s string) []uint16 {
|
r := make([]uint16, 0, len(s)+1)
|
for _, c := range s {
|
if c <= 0xFFFF {
|
r = append(r, uint16(c))
|
} else {
|
c -= 0x10000
|
r = append(r, uint16(c>>10)+0xD800, uint16(c&0x3FF)+0xDC00)
|
}
|
}
|
return r
|
}
|
