This switches the implementation of _cairo_lzw_compress from using
cairo-hash.c to a custom implementation of the same algorithm that
takes advantage of the specific details of what is needed here.
This final version now has comparable performance to the libtiff code,
but should hopefully be easier to understand.
Add a bunch of comments explaining how the various pieces work.
This new implementation is an entirely original work directly from the
description of the LZWDecode filter in the PostScript Language
Reference, (and in spite of the bugs in the examples provided in that
reference).
This implementation uses the existing cairo-hash.c for the symbol
table. This implementation is somewhat easier to read than the libtiff
code, and avoids any code that may have an advertising clause
attached. This new implementation is the simplest thing I could
implement. It is not as efficient as the libtiff code, (though I did
expect better things from cairo-hash.c).
* src/Makefile.am:
Add cairo-lzw.c to sources
Remove erronous space at start of line
* src/cairo-lzw.c:
New file implementing _cairo_compress_lzw which does Lempel-Ziv & Welch
compression as used by postscript. Based on code from libtiff.
* src/cairo-output-stream.c:
Add _cairo_output_stream_write_base85_string which implements
an encoder for the ASCII85Decode postscript filter.
* src/cairoint.h:
Add _cairo_compress_lzw and _cairo_output_stream_write_base85_string.
* src/cairo-ps-surface.c:
Write Images LZW + Base85 encoded.
Change ps level to 2 (we only needed level 3 for FlateDecode).
Change DocumentData to Clean7Bit as we don't include binary data
anymore.
Bogus fix; misunderstood the relationship between the font bearings
and the computed device offsets. Real fix on my device offsets branch.
This reverts 49b4fe10d0 commit.
cairo-ft-font was being naughty and storing glyph bearings in the
surface device_[xy]_offset fields -- this had no effect previously,
because _cairo_surface_composite ignored those fields, but once it
starts handling device offsets itself, this causes ft text rendering
to break.
All test targets now list an expected cairo_surface_type_t. Add notes
on current limitations of PDF/PS/meta-surface support that causes
CAIRO_CONTENT_COLOR similar surfaces of PDF and PS surfaces to be
returned as image surfaces.
Add cairo_internal_surface_type_t for the meta, paginated, and various
test surfaces.
If the BitBlt in get_image fails, we pretty much can't do anything -- so
fill the destination with white and hope for the best. This enables
somewhat accurate printing of complex operations. Also, check the
destination device caps before calling AlphaBlend; return UNSUPPORTED if
the destination DC can't do AlphaBlend.
(cherry picked from 9831de538e347a624af5b0ca38242b198b64bd45 commit)
If the DC is a display DC, inspect its depth and set out local format
appropriately. If it's not a display DC, assume RGB24.
(cherry picked from 6dd0a70d271f93df95f4bcaff5073b9bf90cecb6 commit)
Fixes up src coords and width/height before calling AlphaBlend/BitBlt; it's
an error to try to use a region that extents outside of the source surface
as a source DC.
Doesn't repair the extra region relative to the operator -- e.g. regions
outside of an ARGB source surface with SOURCE operator should be cleared
to fully transparent black in the destination.
(cherry picked from bc19c5b64b0e38e9d20045907d7b47d79f6afc60 commit)
Adds cairo_win32_surface_create_dib() for creating a win32 DIB-backed
surface with a particular format. Also exposes
cairo_win32_surface_get_dc() to obtain the DC of a win32 surface.
(cherry picked from 0813a1b9b6f35d786fe8cb0d4748771023956cde commit)
mark_dirty will force cairo to set its own clip the next time the cairo clip
is applied after mark_dirty; otherwise we run the risk of cairo's cached
clip and the device clip getting out of sync if any clip-related functions
are used on the native device back-end.
(cherry picked from 1935a28949da8569f924e37714ec19571fa95987 commit)
(cherry picked from ef8b472f0ffab7b8b828d7297c7e454bb22bd5ec commit)
- Save extents at surface creation and always return these
- Simplify clipping paths
(cherry picked from a67722b3d7280e6c2375778c2d46556cca261bfc commit)
(cherry picked from 7ce09732a978749a4da814feb77f50161dc42c91 commit)
