Re: Stipples support in MS-Windows port

[Elijah G.]

Yuri Khan <yuri.v.khan@gmail.com> writes:

> If swapping the background and foreground colors to account for that
> mapping is not satisfactory for you, you could invert the bitmap
> before creating the brush.
>
> The steps to do that would be, if I have not completely forgotten the GDI API:
>
> 1. Use CreateCompatibleDC to create a memory DC.
> 2. Select the stipple bitmap into this memory DC using SelectObject.
> 3. Call InvertRect on that DC, passing (0, 0)–(w, h) as the target rectangle.

Thank you for the advises.
Can you explain why use (0, 0)-(w, h) instead the defined RECT from the
code please?

Here is the current function code with the advises applied (except the
third step that i had to use a defined RECT), but it doesn't seems work
neither, i don't know if i did something wrong when applying the steps:

--8<---------------cut here---------------start------------->8---
static void
w32_fill_stipple_pattern (HDC hdc, struct glyph_string *s, Emacs_GC *gc,
                          int x, int y, unsigned int width, unsigned int height)
{
  SetTextColor (hdc, gc->foreground);
  SetBkColor (hdc, gc->background);

  RECT r;
  r.left = x;
  r.top = y;
  r.right = x + width;
  r.bottom = y + height;

  Emacs_Pixmap bm;
  bm = FRAME_DISPLAY_INFO (s->f)->bitmaps[s->face->stipple - 1].stipple;

  HDC comp_dc = CreateCompatibleDC(hdc);
  SelectObject (comp_dc, bm);
  InvertRect (comp_dc, &r);

  HBRUSH hb = CreatePatternBrush (bm);

  FillRect (hdc, &r, hb);

  DeleteObject (hb);
  DeleteDC(comp_dc);
}
--8<---------------cut here---------------end--------------->8---


Also i'm wondering if BitBlt can be another solution too.