TEXTMETRIC 结构和“Cambria Math"的问题；字体 [英] Problem with the TEXTMETRIC struct and the "Cambria Math" font

问题描述

如果我运行下面的代码，我会得到带有cambria Math"字体的 tm 和 gm 结构的以下值:

tm.tmHeight = 161tm.tmAscent = 90tm.tmDescent = 71

和

gm.gmBlackBoxY = 14

tm 中的值明显有误！gmBlackBoxY 似乎是正确的.

现在，如果我用

运行代码

lfFaceName = "Arial"

我为 tm 和 gm 得到以下值，它们是正确的:

tm.tmHeight = 33tm.tmAscent = 27tm.tmDescent = 6

和

gm.gmBlackBoxY = 15

代码:

int iLogPixelsY;iLogPixelsY = GetDeviceCaps(hdc,LOGPIXELSY);LOGFONT lf;国际知识产权；iPts = 22;memset(&lf, 0, sizeof(LOGFONT));lf.lfHeight = -iPts * iLogPixelsY/72;lf.lfWeight = FW_NORMAL;lf.lfItalic = 0;lf.lfCharSet = 0;lf.lfOutPrecision = OUT_TT_ONLY_PRECIS;wcscpy(lf.lfFaceName, L"Cambria Math");HFONT hFont;hFont = CreateFontIndirect(&lf);hFont = (HFONT)SelectObject(hdc, hFont);TCHAR tx;tx = 'a';TEXTMETRIC tm;GetTextMetrics(hdc, &tm);字形 gm;GetGlyphOutline(hdc, tx, GGO_METRICS, &gm, 0, NULL, &gmat);

谁能解释为Cambria Math"字体获取TEXTMETRIC 结构的明显错误?

解决方案

代码中的错误不适用于获取 TEXTMETRIC 结构(不包括在同一代码中使用 TCHARs、CHARs 和 WCHARs 函数和变量).

>

tm.tmHeight == 161;tm.tmAscent == 90;tm.tmDescent == 71;tm.tmInternalLeading == 132;

以上几行没有任何错误！！！

tm.tmHeight == tm.tmAscent + tm.tmDescent;tm.tmHeight == tm.tmInternalLeading + MulDiv(22,GetDeviceCaps(hdc,LOGPIXELSY),72);

Cambria Math"就是用这些参数设计的！

转到链接 http://www.ascenderfonts.com/font/cambria-regular.aspx 将字体大小更改为 22pt(或其他)，并查看字体Cambria"和字体Cambria Math"的上下边距之间的差异.

If I run the code below, I get the following values for the tm and gm structures with the "cambria Math" font:

tm.tmHeight = 161
tm.tmAscent = 90
tm.tmDescent = 71

and

gm.gmBlackBoxY = 14

The values in tm are clearly in error! The gmBlackBoxY seems to be correct.

Now, if I run the code with

lfFaceName = "Arial"

I get for tm and gm the following values, which are correct:

tm.tmHeight = 33
tm.tmAscent = 27
tm.tmDescent = 6

and

gm.gmBlackBoxY = 15

Code:

int iLogPixelsY;
iLogPixelsY = GetDeviceCaps(hdc,LOGPIXELSY);

LOGFONT lf;
int iPts;
iPts = 22;

memset(&lf, 0, sizeof(LOGFONT));

lf.lfHeight = -iPts * iLogPixelsY / 72;
lf.lfWeight = FW_NORMAL;
lf.lfItalic = 0;
lf.lfCharSet = 0;
lf.lfOutPrecision = OUT_TT_ONLY_PRECIS;

wcscpy(lf.lfFaceName, L"Cambria Math");
HFONT hFont;
hFont = CreateFontIndirect(&lf);
hFont = (HFONT)SelectObject(hdc, hFont);

TCHAR tx;
tx = 'a';

TEXTMETRIC tm;
GetTextMetrics(hdc, &tm);

GLYPHMETRICS gm;
GetGlyphOutline(hdc, tx, GGO_METRICS, &gm, 0, NULL, &gmat);

Could anyone explain the apparent incorrectness in obtaining the TEXTMETRIC structure for a "Cambria Math" font ?

解决方案

Incorrectness in your code is does not apply to obtaining TEXTMETRIC structure (excluding, that you use TCHARs, CHARs and WCHARs functions and variables in same code).

tm.tmHeight == 161;
tm.tmAscent == 90;
tm.tmDescent == 71;
tm.tmInternalLeading == 132;

Above lines do not have any errors!!!

tm.tmHeight == tm.tmAscent + tm.tmDescent;
tm.tmHeight == tm.tmInternalLeading + MulDiv(22,GetDeviceCaps(hdc,LOGPIXELSY),72);

"Cambria Math" is designed with these parameters!

Go to the link http://www.ascenderfonts.com/font/cambria-regular.aspx Change the font size to 22pt (or whatever) and look at the difference between of top and bottom margins for the font "Cambria" and font "Cambria Math".

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