NEWTEXTMETRIC

NEWTEXTMETRIC

The NEWTEXTMETRIC structure contains data that describes a physical font.

typedef struct tagNEWTEXTMETRIC { // ntm

LONG tmHeight;

LONG tmAscent;

LONG tmDescent;

LONG tmInternalLeading;

LONG tmExternalLeading;

LONG tmAveCharWidth;

LONG tmMaxCharWidth;

LONG tmWeight;

LONG tmOverhang;

LONG tmDigitizedAspectX;

LONG tmDigitizedAspectY;

BCHAR tmFirstChar;

BCHAR tmLastChar;

BCHAR tmDefaultChar;

BCHAR tmBreakChar;

BYTE tmItalic;

BYTE tmUnderlined;

BYTE tmStruckOut;

BYTE tmPitchAndFamily;

BYTE tmCharSet;

DWORD ntmFlags;

UINT ntmSizeEM;

UINT ntmCellHeight;

UINT ntmAvgWidth;

} NEWTEXTMETRIC;

Members

tmHeight

Specifies the height (ascent + descent) of characters.

tmAscent

Specifies the ascent (units above the base line) of characters.

tmDescent

Specifies the descent (units below the base line) of characters.

tmInternalLeading

Specifies the amount of leading (space) inside the bounds set by the tmHeight member. Accent marks and other diacritical characters may occur in this area. The designer may set this member to zero.

tmExternalLeading

Specifies the amount of extra leading (space) that the application adds between rows. Since this area is outside the font, it contains no marks and is not altered by text output calls in either OPAQUE or TRANSPARENT mode. The designer may set this member to zero.

tmAveCharWidth

Specifies the average width of characters in the font (generally defined as the width of the letter x). This value does not include overhang required for bold or italic characters.

tmMaxCharWidth

Specifies the width of the widest character in the font.

tmWeight

Specifies the weight of the font.

tmOverhang

Specifies the extra width per string that may be added to some synthesized fonts. When synthesizing some attributes, such as bold or italic, graphics device interface (GDI) or a device may have to add width to a string on both a per-character and per-string basis. For example, GDI makes a string bold by expanding the spacing of each character and overstriking by an offset value; it italicizes a font by shearing the string. In either case, there is an overhang past the basic string. For bold strings, the overhang is the distance by which the overstrike is offset. For italic strings, the overhang is the amount the top of the font is sheared past the bottom of the font.

The tmOverhang member enables the application to determine how much of the character width returned by a GetTextExtentPoint32 function call on a single character is the actual character width and how much is the per-string extra width. The actual width is the extent minus the overhang.

tmDigitizedAspectX

Specifies the horizontal aspect of the device for which the font was designed.

tmDigitizedAspectY

Specifies the vertical aspect of the device for which the font was designed. The ratio of the tmDigitizedAspectX and tmDigitizedAspectY members is the aspect ratio of the device for which the font was designed.

tmFirstChar

Specifies the value of the first character defined in the font.

tmLastChar

Specifies the value of the last character defined in the font.

tmDefaultChar

Specifies the value of the character to be substituted for characters that are not in the font.

tmBreakChar

Specifies the value of the character to be used to define word breaks for text justification.

tmItalic

Specifies an italic font if it is nonzero.

tmUnderlined

Specifies an underlined font if it is nonzero.

tmStruckOut

Specifies a strikeout font if it is nonzero.

tmPitchAndFamily

Specifies the pitch and family of the selected font. The low-order bit (bit 0) specifies the pitch of the font. If it is 1, the font is variable pitch (or proportional). If it is 0, the font is fixed pitch (or monospace). Bits 1 and 2 specify the font type. If both bits are 0, the font is a raster font; if bit 1 is 1 and bit 2 is 0, the font is a vector font; if bit 1 is 0 and bit 2 is set, or if both bits are 1, the font is some other type. Bit 3 is 1 if the font is a device font; otherwise, it is 0.

The four high-order bits designate the font family. The tmPitchAndFamily member can be combined with the hexadecimal value 0xF0 by using the bitwise AND operator and can then be compared with the font family names for an identical match. For more information about the font families, see the LOGFONT structure.

tmCharSet

Specifies the character set of the font.

ntmFlags

Specifies whether the font is italic, underscored, outlined, bold, and so forth. The following list shows the bits corresponding to each font type:

Bit	Meaning
0	Italic
1	Underscore
2	Negative
3	Outline
4	Strikeout
5	Bold

ntmSizeEM

Specifies the size of the em square for the font. This value is in "notional units" (that is, the units for which the font was designed).

ntmCellHeight

Specifies the height, in notional units, of the font. This value should be compared with the value of the ntmSizeEM member.

ntmAvgWidth

Specifies the average width of characters in the font, in notional units. This value should be compared with the value of the ntmSizeEM member.

Remarks

The last four members of the NEWTEXTMETRIC structure are not included in the TEXTMETRIC structure; in all other respects, the structures are identical.

The sizes in the NEWTEXTMETRIC structure are typically given in logical units; that is, they depend on the current mapping mode of the display context.