func (w *windowImpl) Upload(dp image.Point, src screen.Buffer, sr image.Rectangle) {
completion := make(chan struct{})
// Protect struct contents from being GCed
uploadsMu.Lock()
uploadID++
id := uploadID
uploads[id] = upload{
dp: dp,
src: src.(*bufferImpl),
sr: sr,
completion: completion,
}
uploadsMu.Unlock()
win32.SendMessage(w.hwnd, msgUpload, id, 0)
<-completion
}
func (w *windowImpl) Fill(dr image.Rectangle, src color.Color, op draw.Op) {
rect := _RECT{
Left: int32(dr.Min.X),
Top: int32(dr.Min.Y),
Right: int32(dr.Max.X),
Bottom: int32(dr.Max.Y),
}
r, g, b, a := src.RGBA()
r >>= 8
g >>= 8
b >>= 8
a >>= 8
color := (a << 24) | (r << 16) | (g << 8) | b
msg := uint32(msgFillOver)
if op == draw.Src {
msg = msgFillSrc
}
// Note: this SendMessage won't return until after the fill
// completes, so using &rect is safe.
win32.SendMessage(w.hwnd, msg, uintptr(color), uintptr(unsafe.Pointer(&rect)))
}
