//export areaView_drawRect
func areaView_drawRect(self C.id, rect C.struct_xrect) {
s := getSysData(self)
// no need to clear the clip rect; the NSScrollView does that for us (see the setDrawsBackground: call in objc_darwin.m)
// rectangles in Cocoa are origin/size, not point0/point1; if we don't watch for this, weird things will happen when scrolling
cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.x+rect.width), int(rect.y+rect.height))
max := C.frame(self)
cliprect = image.Rect(0, 0, int(max.width), int(max.height)).Intersect(cliprect)
if cliprect.Empty() { // no intersection; nothing to paint
return
}
i := s.handler.Paint(cliprect)
C.drawImage(
unsafe.Pointer(pixelData(i)), C.intptr_t(i.Rect.Dx()), C.intptr_t(i.Rect.Dy()), C.intptr_t(i.Stride),
C.intptr_t(cliprect.Min.X), C.intptr_t(cliprect.Min.Y))
}
//export areaView_drawRect
func areaView_drawRect(self C.id, rect C.struct_xrect, data unsafe.Pointer) {
a := (*area)(data)
// no need to clear the clip rect; the NSScrollView does that for us (see the setDrawsBackground: call in objc_darwin.m)
// rectangles in Cocoa are origin/size, not point0/point1; if we don't watch for this, weird things will happen when scrolling
cliprect := image.Rect(int(rect.x), int(rect.y), int(rect.x+rect.width), int(rect.y+rect.height))
cliprect = image.Rect(0, 0, int(a.width), int(a.height)).Intersect(cliprect)
if cliprect.Empty() { // no intersection; nothing to paint
return
}
i := a.handler.Paint(cliprect)
success := C.drawImage(
unsafe.Pointer(pixelData(i)), C.intptr_t(i.Rect.Dx()), C.intptr_t(i.Rect.Dy()), C.intptr_t(i.Stride),
C.intptr_t(cliprect.Min.X), C.intptr_t(cliprect.Min.Y))
if success == C.NO {
panic("error drawing into Area (exactly what is unknown)")
}
}