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We can get a case with gnome-terminal + links, where we get two arrays
of glyphs all with 0 width and 0 heights in them. If this happens
we manage to get to this case without any buffer setup and segfault.
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Treat 1 bit glyphs and masks as PICT_a8 in the glyph cache. We're not able to
accelerate them otherwise.
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Track damage after using UploadToScreen directly.
Don't waste any effort on empty glyphs.
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When possible, use UploadToScreen() rather than CompositePicture()
to upload glyphs onto the glyph cache pixmap. This avoids allocating
offscreen memory for each glyph making management of offscreen
areas much more efficient.
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Allocate each cache at a different vertical position in the
per-format pixmap. Fix width/height confusion when choosing
the cache for a glyph.
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Add a function to composite multiple independent rectangles
from the same source to the same destination in a single
operation: this is useful for building a glyph mask.
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Add back exaGlyphs(); the new version copies the glyph images
onto a single large glyph pixmap and draws from their to the
destination surface. This reduces the management of small
offscreen areas and will allow us to avoid texture unit setup
between each glyph.
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