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Attempted to fix the Windows transparency issues; we're not quite there... flicker...

This commit is contained in:
Pietro Gagliardi 2014-04-11 11:29:07 -04:00
parent e713b59bec
commit 586ac941a4
1 changed files with 19 additions and 4 deletions
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23
area_windows.go
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@ -54,6 +54,7 @@ var (
_getUpdateRect = user32.NewProc("GetUpdateRect") _getUpdateRect = user32.NewProc("GetUpdateRect")
_beginPaint = user32.NewProc("BeginPaint") _beginPaint = user32.NewProc("BeginPaint")
_endPaint = user32.NewProc("EndPaint") _endPaint = user32.NewProc("EndPaint")
_fillRect = user32.NewProc("FillRect")
_gdipCreateBitmapFromScan0 = gdiplus.NewProc("GdipCreateBitmapFromScan0") _gdipCreateBitmapFromScan0 = gdiplus.NewProc("GdipCreateBitmapFromScan0")
_gdipCreateFromHDC = gdiplus.NewProc("GdipCreateFromHDC") _gdipCreateFromHDC = gdiplus.NewProc("GdipCreateFromHDC")
_gdipDrawImageI = gdiplus.NewProc("GdipDrawImageI") _gdipDrawImageI = gdiplus.NewProc("GdipDrawImageI")
@ -62,6 +63,8 @@ var (
) )
const ( const (
areaBackgroundBrush = _HBRUSH(_COLOR_BTNFACE + 1)
// from winuser.h // from winuser.h
_WM_PAINT = 0x000F _WM_PAINT = 0x000F
) )
@ -104,6 +107,19 @@ func paintArea(s *sysData) {
} }
hdc := _HANDLE(r1) hdc := _HANDLE(r1)
// Windows won't necessarily erase the update rect for us; we need to do so ourselves
// thanks to the people at http://stackoverflow.com/questions/23001890/winapi-getupdaterect-with-brepaint-true-inside-wm-paint-doesnt-clear-the-pai
// TODO this whole thing is inefficient, as explained in the page; we probably don't need _getUpdateRect
if ps.fErase != 0 { // if Windows didn't
r1, _, err := _fillRect.Call(
uintptr(hdc),
uintptr(unsafe.Pointer(&xrect)),
uintptr(areaBackgroundBrush))
if r1 == 0 { // failure
panic(fmt.Errorf("error manually clearing Area background: %v", err))
}
}
i := s.handler.Paint(cliprect) i := s.handler.Paint(cliprect)
// the pixels are arranged in RGBA order, but GDI+ requires BGRA // the pixels are arranged in RGBA order, but GDI+ requires BGRA
// we don't have a choice but to convert it ourselves // we don't have a choice but to convert it ourselves
@ -250,8 +266,7 @@ func scrollArea(s *sysData, wparam _WPARAM, which uintptr) {
uintptr(0), uintptr(0),
uintptr(0), uintptr(0),
uintptr(0), uintptr(0),
// TODO also SW_ERASE? or will the GetUpdateRect() call handle it? uintptr(_SW_INVALIDATE | _SW_ERASE)) // mark the remaining rect as needing redraw and erase...
uintptr(_SW_INVALIDATE)) // mark the remaining rect as needing redraw...
if r1 == _ERROR { // failure if r1 == _ERROR { // failure
panic(fmt.Errorf("error scrolling Area: %v", err)) panic(fmt.Errorf("error scrolling Area: %v", err))
} }
@ -317,7 +332,7 @@ func repaintArea(s *sysData) {
r1, _, err := _invalidateRect.Call( r1, _, err := _invalidateRect.Call(
uintptr(s.hwnd), uintptr(s.hwnd),
uintptr(0), // the whole area uintptr(0), // the whole area
uintptr(_FALSE)) // TODO use _TRUE to mark that we should erase? or will the GetUpdateRect() call handle it? uintptr(_TRUE)) // have Windows erase if possible
if r1 == 0 { // failure if r1 == 0 { // failure
panic(fmt.Errorf("error flagging Area as needing repainting after event (last error: %v)", err)) panic(fmt.Errorf("error flagging Area as needing repainting after event (last error: %v)", err))
} }
@ -596,7 +611,7 @@ func registerAreaWndClass(s *sysData) (newClassName string, err error) {
hInstance: hInstance, hInstance: hInstance,
hIcon: icon, hIcon: icon,
hCursor: cursor, hCursor: cursor,
hbrBackground: _HBRUSH(_COLOR_BTNFACE + 1), hbrBackground: areaBackgroundBrush,
} }
ret := make(chan uiret) ret := make(chan uiret)