Stick a fork in GetCharacterPlacement

re: Stick a fork in GetCharacterPlacement

Michael S. Kaplan — Sun, 13 Nov 2011 18:47:54 GMT

Okay, the docs are talking about some of the new functions they added -- not all functions. And none of those new functions are GetCharacterPlacement replacement functions.

GetCharacterPlacement is not being updated. If you want to do more than it does and you want to support XP, than moving to Uniscribe is your only option.

re: Stick a fork in GetCharacterPlacement

Pierre — Sun, 13 Nov 2011 18:15:59 GMT

I'm trying to do something rather basic, and would prefer to use GetCharacterPlacement rather than wade into Uniscribe.

The problem I'm having is that for simple English script, the characters returned in lpGlyphs[] bear no resemblance to the original input. I must be doing something wrong.

Here is my code:

GCP_RESULTSW gcp_results;

wchar_t ww[] = L"Gnarfle";

int len = wcslen(ww);

memset(&gcp_results, NUL, sizeof(gcp_results));

gcp_results.lStructSize = sizeof(gcp_results);

gcp_results.lpOrder = (UINT *)calloc(len, sizeof(UINT)); // order after reordering

memset(gcp_results.lpOrder, NUL, len * sizeof(UINT));

gcp_results.lpGlyphs = (WCHAR *)calloc(len, sizeof(WCHAR));

memset(gcp_results.lpGlyphs, NUL, len * sizeof(WCHAR));

gcp_results.nGlyphs = len;

gcp_results.lpGlyphs[0] = 0; // normal ligation

GetCharacterPlacementW(hdc, ww, len, 0, &gcp_results,

GCP_GLYPHSHAPE| GCP_REORDER | GCP_LIGATE);

Results after calling GetCharacterPlacementW:

ww: [0]=0047/G [1]=006E/n [2]=0061/a [3]=0072/r [4]=0066/f [5]=006C/l [6]=0065/e

gcp_results.lpOrder [0]=0 [1]=1 [2]=2 [3]=3 [4]=4 [5]=5 [6]=6

gcp_results.lpGlyphs [0]=002A/* [1]=0051/Q [2]=0044/D [3]=0055/U [4]=0049/I [5]=004F/O [6]=0048/H

What is in 'lpGlyphs'??

I did a test with Arabic, and lpGlyphs returns with non-Arabic characters. Why doesn't this work?

re: Stick a fork in GetCharacterPlacement

Pierre — Sun, 13 Nov 2011 17:28:50 GMT

The documentation for some functions (ex: ScriptGetFontFeatureTags, ScriptGetFontAlternateGlyphs, ScriptGetFontLanguageTags) says it requires "Minimum supported client: Windows Vista".

See:

msdn.microsoft.com/.../dd368547%28v=VS.85%29.aspx

Also, Visual Studio 2010 documentation.

re: Stick a fork in GetCharacterPlacement

Michael S. Kaplan — Sun, 13 Nov 2011 16:12:44 GMT

Um, Uniscribe was added in Windows 2000 (and updated in XP and XP SP2). It requires complex script support to be installed until Vista, but that is a far cry from unavailable!

re: Stick a fork in GetCharacterPlacement

Pierre — Sun, 13 Nov 2011 15:55:52 GMT

For some applications, TextOutW or ExtTextOutW are too simplistic. In my app I have to display the letters along a curved arc. Each letter requires creating an individual font with a different lfEscapement and lfOrientation. It would be nice to display the letters correctly.

Uniscribe only works on Vista and WIndows 7. A lot of my customers are still using XP.

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re: Stick a fork in GetCharacterPlacement

Michael S. Kaplan — Sat, 24 Sep 2005 02:51:09 GMT

David -- ICU does not have full support for rendering as many scripts.... and this really is a rendering issue.