Re: [PATCH v2 0/4] MR11035: gdi32/uniscribe: Eagerly cache cmap tables for a font.

[समीरसिंह Sameer Singh (＠ss141309)]

On Mon Jun  1 10:38:38 2026 +0000, Nikolay Sivov wrote:
> This could also mean that HDC handle is cached, not the data itself.
> I don't think that is the case. I tried running this program on windows, where I make two calls to `ScriptShapeOpenType` and in between the first and second call I delete the `dc` . If windows cached the HDC then the second called would have failed, but that is not the case the shaping was done successfully.

```c
#include <windows.h>
#include <usp10.h>
#include <stdio.h>

#define MAKE_OPENTYPE_TAG(a,b,c,d) \
    ((OPENTYPE_TAG)(a) | ((OPENTYPE_TAG)(b) << 8) | \
  ((OPENTYPE_TAG)(c) << 16) | ((OPENTYPE_TAG)(d) << 24))

int main(void) {
  static const WCHAR test1[] = {'O','n','e',0};
  static const WCHAR test2[] = {'T','w','o',0};

  HDC hdc = CreateCompatibleDC(NULL);
  HFONT font = CreateFontA(20, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, "Tahoma");
  HFONT orig_font = SelectObject(hdc, font);

  WORD glyphs[4], logclust[4];
  SCRIPT_CHARPROP charProp[4];
  SCRIPT_GLYPHPROP glyphProp[4];
  int pcGlyphs = 0;
  SCRIPT_CACHE sc = NULL;
  SCRIPT_ANALYSIS sa = {0};
  sa.eScript = 1;

  OPENTYPE_TAG scriptTag = MAKE_OPENTYPE_TAG('l', 'a', 't', 'n');
  HRESULT hr = ScriptShapeOpenType(hdc, &sc, &sa, scriptTag, 0, NULL, NULL, 0, test1, 3, 3, logclust, charProp, glyphs, glyphProp, &pcGlyphs);
  if (FAILED(hr)) {
    printf("Shaping failed for the first run. hr=%08lx\n", hr);
    return -1;
  }

  DeleteDC(hdc);
  DeleteObject(font);

  hr = ScriptShapeOpenType(NULL, &sc, &sa, scriptTag, 0, NULL, NULL, 0, test2, 3, 3, logclust, charProp, glyphs, glyphProp, &pcGlyphs);
  if (FAILED(hr)) {
    printf("Shaping failed for the second run. hr=%08lx\n", hr);
    return -1;
  }

  printf("Shaping successful for the second run. hr=%08lx\n", hr);

  ScriptFreeCache(&sc);
  return 0;
}
```

Output:

```
Shaping successful for the second run. hr=00000000
```

-- 
https://gitlab.winehq.org/wine/wine/-/merge_requests/11035#note_141849