func init() {
// Retrieve screen DPI
hDC := win.GetDC(0)
defer win.ReleaseDC(0, hDC)
screenDPIX = int(win.GetDeviceCaps(hDC, win.LOGPIXELSX))
screenDPIY = int(win.GetDeviceCaps(hDC, win.LOGPIXELSY))
// Initialize default font
var err error
if defaultFont, err = NewFont("MS Shell Dlg 2", 8, 0); err != nil {
panic("failed to create default font")
}
}
func (c *Canvas) init() (*Canvas, error) {
c.dpix = int(win.GetDeviceCaps(c.hdc, win.LOGPIXELSX))
c.dpiy = int(win.GetDeviceCaps(c.hdc, win.LOGPIXELSY))
if win.SetBkMode(c.hdc, win.TRANSPARENT) == 0 {
return nil, newError("SetBkMode failed")
}
switch win.SetStretchBltMode(c.hdc, win.HALFTONE) {
case 0, win.ERROR_INVALID_PARAMETER:
return nil, newError("SetStretchBltMode failed")
}
if !win.SetBrushOrgEx(c.hdc, 0, 0, nil) {
return nil, newError("SetBrushOrgEx failed")
}
return c, nil
}
func (c *Canvas) Bounds() Rectangle {
return Rectangle{
Width: int(win.GetDeviceCaps(c.hdc, win.HORZRES)),
Height: int(win.GetDeviceCaps(c.hdc, win.VERTRES)),
}
}