DWRITE_JUSTIFICATION_OPPORTUNITY structure
The DWRITE_JUSTIFICATION_OPPORTUNITY structure specifies justification info per glyph.
Syntax
struct DWRITE_JUSTIFICATION_OPPORTUNITY {
FLOAT expansionMinimum;
FLOAT expansionMaximum;
FLOAT compressionMaximum;
UINT32 expansionPriority :8;
UINT32 compressionPriority :8;
UINT32 allowResidualExpansion :1;
UINT32 allowResidualCompression :1;
UINT32 applyToLeadingEdge :1;
UINT32 applyToTrailingEdge :1;
UINT32 reserved :12;
};
Members
- expansionMinimum
-
Minimum amount of expansion to apply to the side of the glyph. This might vary from zero to infinity, typically being zero except for kashida.
- expansionMaximum
-
Maximum amount of expansion to apply to the side of the glyph. This might vary from zero to infinity, being zero for fixed-size characters and connected scripts, and non-zero for discrete scripts, and non-zero for cursive scripts at expansion points.
- compressionMaximum
-
Maximum amount of compression to apply to the side of the glyph. This might vary from zero up to the glyph cluster size.
- expansionPriority
-
Priority of this expansion point. Larger priorities are applied later, while priority zero does nothing.
- compressionPriority
-
Priority of this compression point. Larger priorities are applied later, while priority zero does nothing.
- allowResidualExpansion
-
Allow this expansion point to use up any remaining slack space even after all expansion priorities have been used up.
- allowResidualCompression
-
Allow this compression point to use up any remaining space even after all compression priorities have been used up.
- applyToLeadingEdge
-
Apply expansion and compression to the leading edge of the glyph. This bit is FALSE (0) for connected scripts, fixed-size characters, and diacritics. It is generally FALSE within a multi-glyph cluster, unless the script allows expansion of glyphs within a cluster, like Thai.
- applyToTrailingEdge
-
Apply expansion and compression to the trailing edge of the glyph. This bit is FALSE (0) for connected scripts, fixed-size characters, and diacritics. It is generally FALSE within a multi-glyph cluster, unless the script allows expansion of glyphs within a cluster, like Thai.
- reserved
-
Reserved
Requirements
|
Minimum supported client |
Windows 8 and Platform Update for Windows 7 [desktop apps only] |
|---|---|
|
Minimum supported server |
Windows Server 2012 and Platform Update for Windows Server 2008 R2 [desktop apps only] |
|
Minimum supported phone |
Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps] |
|
Header |
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See also