History of API Additions and Changes in ATSUI

Table B-1 alphabetically lists the functions whose implementation have changed with ATSUI 1.2.

Table B-1 Functions whose implementation has changed in ATSUI 1.2

Function name	Description of change in ATSUI 1.2
`ATSUGetGlyphBounds`	Now the maximum number of enclosing trapezoids returned is 127 rather than 31, as was true for the implementation of this function with ATSUI 1.0 and 1.1.
`ATSUGetTextHighlight`	The maximum number of components that can be passed back is 127 rather than 31.
`ATSUSetFontFeatures`	If you try to set mutually exclusive font features, whether in one or multiple calls, ATSUI 1.2 removes the existing feature and replaces it with your newly set feature. Earlier versions of ATSUI will not remove a feature when you set its contradictory feature.

The following constants were introduced with ATSUI 1.2: gestaltATSUUpdate2, gestaltATSUTextLocatorUsageFeature, kATSLineTabAdjustEnabled, kATSUStyleTextLocatorTag, kATSULineLanguageTag, kATSULineTextLocatorTag, and kATSUMaxLineTag.

Table B-2 alphabetically lists the functions that were introduced with ATSUI 1.1.

Table B-2 Functions new to ATSUI 1.1

Function name
`ATSUClearLayoutCache`
`ATSUClearLineControls`
`ATSUCopyLineControls`
`ATSUCountFontTracking`
`ATSUCreateAndCopyTextLayout`
`ATSUCreateMemorySetting`
`ATSUDisposeMemorySetting`
`ATSUGetAllLineControls`
`ATSUGetCurrentMemorySetting`
`ATSUGetFontFallbacks`
`ATSUGetIndFontTracking`
`ATSUGetLineControl`
`ATSUSetCurrentMemorySetting`
`ATSUSetFontFallbacks`
`ATSUSetLineControls`
`ATSUCustomAllocFunc`
`ATSUCustomGrowFunc`
`ATSUCustomFreeFunc`

Table B-3 alphabetically lists the ATSUI 1.0 functions whose implementation changed with ATSUI 1.1.

Table B-3 Functions whose implementation has changed with ATSUI 1.1

Function name	Description of change in 1.0
`ATSUBreakLine`	Now returns the result code `kATSULineBreakInWord` to indicate that ATSUBreakLine performed a line break within a word. Note that this is a status message, not an error code.
`ATSUCopyToHandle`	No longer used. Instead, use the `'ustl'` resource to format styled text in the clipboard.
`ATSUHighlightText`	Now can extend highlighting across tab stops using the mask constants kATSLineFillOutToWidth and `kATSLineImposeNoAngleForEnds`.
`ATSUPasteFromHandle`	No longer used. Instead, use the `'ustl'` resource to format styled text in the clipboard.
`ATSUSetAttributes`	New style run attribute tag constants now available.
`ATSUSetLayoutControls`	New text layout and line attribute tag constants now available.
`ATSUUnhighlightText`	Now can erase highlighting across tab stops using the mask constants `kATSLineFillOutToWidth` and `kATSLineImposeNoAngleForEnds`.