DWRITE_JUSTIFICATION_OPPORTUNITY structure (dwrite_1.h)
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
| Requirement | Value |
|---|---|
| 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] |
| Header | dwrite_1.h |