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The changes to fz_render_glyph cause the scissor rectangle to no longer
match the transformation matrix which causes Type 3 glyphs to be
clipped at larger resolutions.
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Pull subpixel glyph adjustment calculations into fz_subpixel_adjust.
This reduces the repetition of code, and will be helpful for the
OpenGL device.
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These do no caching, and are intended to be useful for the opengl device.
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For large glyphs, sub pixel positioning is supremely unimportant.
Even for smaller glyphs, we don't need 5*5 possible sub pixel
positions. Base the degree of sub pixel quantisation on the size
of the glyphs.
This should result in better cache use.
We push all the glyph sub positioning logic into fz_render_glyph
(and fz_render_stroked_glyph). This simplifies the calling code.
We also tweak fz_render_glyph so that it updates the transform it
is called with to reflect the sub pixel positioning. This solves
various problems: Firstly, we can round positions both up and down
to achieve a smaller net displacement (e.g. (0.99, 0.99) can go
to (1,1) rather than (0.75, 0.75) if we have a subpixel position
resolution of 1/4 pixels).
Secondly, glyphs that are drawn from outlines will have exactly the
same subpixel changes applied. This is unlikely to be noticable, but
it does mean that baselines should avoid having any shifts in them.
Finally, it enables us to avoid lots of unnecessary copying of
matrices, hopefully reducing overhead.
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Rather than generating fz_pixmaps for glyphs, we generate fz_glyphs.
fz_glyphs can either contain a pixmap, or an RLEd representation
(if it's a mask, and it's smaller).
Should take less memory in the cache, and should be faster to plot.
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Forgot to drop the font.
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The current code uses a hash table with linear probing. This means
that when the cache fills up, we have no alternative but to bin the
whole thing (or do an expensive rebuild).
Change to using a simple hash table with linked lists of bucket chains,
and additional LRU lists. This way we can ditch the oldest glyphs as
we need more space.
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Thanks to zeniko for spotting these problems.
When we close a document, purge the glyph cache to ensure that
no type3 glyphs hang around with pointers to pdf_obj's that
are now gone.
Pass doc to pdf_new_obj_from_str rather than NULL. We believe
that the reason this needed to be NULL is no longer valid.
Also, revert to using an int for ref counts.
In a quick test of our regression suite we only found 2 files
that ever made a refcount > 256 (and they never got larger than
768), but the potential is there for issues. Reverting to an
int until we can think of a better idea.
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