// create an Alpha Icon or Cursor from an Image
// http://support.microsoft.com/kb/318876
func createAlphaCursorOrIconFromImage(im image.Image, hotspot image.Point, fIcon bool) (win.HICON, error) {
hBitmap, err := hBitmapFromImage(im)
if err != nil {
return 0, err
}
defer win.DeleteObject(win.HGDIOBJ(hBitmap))
// Create an empty mask bitmap.
hMonoBitmap := win.CreateBitmap(int32(im.Bounds().Dx()), int32(im.Bounds().Dy()), 1, 1, nil)
if hMonoBitmap == 0 {
return 0, newError("CreateBitmap failed")
}
defer win.DeleteObject(win.HGDIOBJ(hMonoBitmap))
var ii win.ICONINFO
if fIcon {
ii.FIcon = win.TRUE
}
ii.XHotspot = uint32(hotspot.X)
ii.YHotspot = uint32(hotspot.Y)
ii.HbmMask = hMonoBitmap
ii.HbmColor = hBitmap
// Create the alpha cursor with the alpha DIB section.
hIconOrCursor := win.CreateIconIndirect(&ii)
return hIconOrCursor, nil
}
func (p *nullPen) Dispose() {
if p.hPen != 0 {
win.DeleteObject(win.HGDIOBJ(p.hPen))
p.hPen = 0
}
}
func (p *GeometricPen) Dispose() {
if p.hPen != 0 {
win.DeleteObject(win.HGDIOBJ(p.hPen))
p.hPen = 0
}
}
func (b *nullBrush) Dispose() {
if b.hBrush != 0 {
win.DeleteObject(win.HGDIOBJ(b.hBrush))
b.hBrush = 0
}
}
func (b *SolidColorBrush) Dispose() {
if b.hBrush != 0 {
win.DeleteObject(win.HGDIOBJ(b.hBrush))
b.hBrush = 0
}
}
// Dispose releases the os resources that were allocated for the Font.
//
// The Font can no longer be used for drawing operations or with GUI widgets
// after calling this method. It is safe to call Dispose multiple times.
func (f *Font) Dispose() {
for dpi, hFont := range f.dpi2hFont {
if dpi != 0 {
win.DeleteObject(win.HGDIOBJ(hFont))
}
delete(f.dpi2hFont, dpi)
}
}
func (bmp *Bitmap) Dispose() {
if bmp.hBmp != 0 {
win.DeleteObject(win.HGDIOBJ(bmp.hBmp))
win.GlobalUnlock(bmp.hPackedDIB)
win.GlobalFree(bmp.hPackedDIB)
bmp.hPackedDIB = 0
bmp.hBmp = 0
}
}