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57 lines
2.0 KiB
Plaintext
57 lines
2.0 KiB
Plaintext
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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PLEASE DO NOT DO WORK ON TOP OF THIS BRANCH.
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I INTEND TO REWRITE HISTORY LATER!!!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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This branch is where I (jmarc) try to implement string-wise metrics
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computation. The goal is to have both good metrics computation (and
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font with proper kerning and ligatures) and better performance than
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what we have with force_paint_single_char. Moreover there has been
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some code factorization in TextMetrics, where the same row-breaking
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algorithm was basically implemented 3 times.
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The bugs fixed and caused by this branch are tracked at ticket #9003:
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http://www.lyx.org/trac/ticket/9003
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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 at strings level to compute
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metrics The list of elements is stored in the row object in visual
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ordering, not logical. This will eventually allow to get rid of the
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Bidi class.
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* rename getColumnNearX to getPosNearX (and change code accordingly).
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It does not make sense to return a position relative to the start of
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row, since nobody needs this.
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* Re-implement cursorX and getPosNearX using row elements.
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* Get rid of lyxrc.force_paint_single_char. This was a workaround that
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is not necessary anymore.
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* Implement proper string metrics computation (with cache). Remove
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useless workarounds which disable kerning and ligatures.
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* Draw also RtL text string-wise. This speeds-up drawing.
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* Do not cut strings at separators in RowPainter when text is not
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justified. This speeds-up painting by reducing the number of strings
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to draw.
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* Do not cut strings at selection boundary in RowPainter. This avoids
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ligature/kerning breaking in latin text, and bad rendering problems
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in Arabic.
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* Remove homebrew Arabic and Hebrew support from Encoding.cpp. We now
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rely on Qt to do handle complex scripts.
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Next steps:
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* Maybe get rid of LyXRC::rtl_support, which does not have a real use case.
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