Alexei Podtelezhnikov <apodt...@gmail.com> wrote: > Dmitry, > > It probably needs adding CS_HREDRAW | CS_VREDRAW to ourClass.style. > > That was not enough.
Alexei, In addition to CS_HREDRAW | CS_VREDRAW the WM_SIZE handler should call DefWindowProc() so that default message processing forces a window update. After that the window gets repainted while being resized. However that leads to the limitation of the demo that can't update its bitmap contents until the mouse button is released and modal message loop passes control back to the application code. As the result WM_SIZE calls gr_win32_surface_resize() however the source bitmap the demo paints to still has old size and contents, and WM_PAINT gets broken. While Anuj's approach works I'd personally refrain from using it since it basically replaces low level user32 code with custom window resizer. I'd suggest to change the demo design, so that it provides a callback to the graphics subsystem for a forced bitmap resize. -- Dmitry.
