diff options
Diffstat (limited to 'area_windows.go')
| -rw-r--r-- | area_windows.go | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/area_windows.go b/area_windows.go index 7cf1fb6..432b231 100644 --- a/area_windows.go +++ b/area_windows.go @@ -120,8 +120,11 @@ func paintArea(s *sysData) { panic(fmt.Errorf("error creating off-screen rendering DC: %v", err)) } rdc := _HANDLE(r1) + // the bitmap has to be compatible with the window + // if we create a bitmap compatible with the DC we just created, it'll be monochrome + // thanks to David Heffernan in http://stackoverflow.com/questions/23033636/winapi-gdi-fillrectcolor-btnface-fills-with-strange-grid-like-brush-on-window r1, _, err = _createCompatibleBitmap.Call( - uintptr(rdc), + uintptr(hdc), uintptr(xrect.Right - xrect.Left), uintptr(xrect.Bottom - xrect.Top)) if r1 == 0 { // failure @@ -181,7 +184,8 @@ func paintArea(s *sysData) { // first, we need to load the bitmap memory, because Windows makes it for us // the pixels are arranged in RGBA order, but GDI+ requires BGRA // this turns out to be just ARGB in little endian; let's convert into this memory - toARGB(i, ppvBits) + // the bitmap Windows gives us has a stride == width + toARGB(i, ppvBits, i.Rect.Dx() * 4) // the second thing is... make a device context for the bitmap :| // Ninjifox just makes another compatible DC; we'll do the same @@ -199,7 +203,7 @@ func paintArea(s *sysData) { previbitmap := _HANDLE(r1) // AND FINALLY WE CAN DO THE ALPHA BLENDING!!!!!!111 -/* blendfunc := _BLENDFUNCTION{ + blendfunc := _BLENDFUNCTION{ BlendOp: _AC_SRC_OVER, BlendFlags: 0, SourceConstantAlpha: 255, // only use per-pixel alphas @@ -220,7 +224,7 @@ func paintArea(s *sysData) { if r1 == _FALSE { // failure panic(fmt.Errorf("error alpha-blending image returned by AreaHandler.Paint() onto background: %v", err)) } -*/ + // and finally we can just blit that into the window r1, _, err = _bitBlt.Call( uintptr(hdc), |