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32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
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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. Note that for now FontMetrics::width(docstring)
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still computes the sum of character widths, so that behavior is
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unchanged.
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Next steps:
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* Make breakRow build a list of elements (string, inset,
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separator,...) in the row. This will be reused by other methods
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* get rid of rowWidth (breakRow does compute this)
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* re-implement getColumnNearX using row elements
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* re-implement x2pos using row elements
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* re-implement row painting using row elements
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* Finally, implement proper string metrics computation (with cache)
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* profile and see how performance can be improved.
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Difference in behavior
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* words longer than the screen are no monger broken at an arbitrary
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point. This will not be useful anymore with horizontal scrolling.
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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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The other differences should be considered as bugs.
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