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35d47698c6
* convert cursorX to new scheme; old computation is still there for the sake of comparison. * use Row to compute separator width in computeRowMetrics; again, the old code is retained for now. * Get rid of rowWidth()
44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
This branch is where I (jmarc) try to implement string_wise metrics
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computation. This is done through a series of cleanups. The expected
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speed improvement will only be visible at the end of the road: indeed
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for now we intend to keep unchanged behavior for testing purposes.
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What is done:
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* Make TextMetrics methods operate on Row objects: breakRow and
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setRowHeight instead of rowBreakPoint and rowHeight.
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* change breakRow operation to operate on text strings on which
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metrics are computed. The list of elements is stored in the row object
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in visual ordering, not logical.
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* re-implement cursorX using row elements
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* Implement proper string metrics computation (with cache), when
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lyxrc.force_paint_single_char is false.
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Next steps:
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* re-implement getColumnNearX using row elements
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* get rid of old code of cursorX and getColumnNearX (which have been
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kept for comparison purpose).
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* re-implement row painting using row elements (can it be done?)
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* profile and see how performance can be improved.
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* Document the code
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Difference in behavior
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* end of paragraph markers metrics are computed with the font of the
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actual text, not default font. This will be extended to the other
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methods.
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* When cursor is after a LtR separator just before a RtL chunk, the
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cursor posiiton is computed better with the new code.
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Other differences that should be considered as bugs
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* words longer than the screen are no monger broken at an arbitrary
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point. This is a problem for languages like chinese that do not use
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separators.
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