| Commit message (Collapse) | Author | Age | Files | Lines |
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Advantages over the old algorithm consist of the following.
* There are no glitches due to full cache clearing.
Items are arranged into linked list ordered by time of last use.
Only the oldest items get deleted at the clearing event.
* Each item now keeps track of number of references.
Referenced cache values are immune to clearing.
* Reduced amount of total cache memory for the same performance.
* Reduced number of memory allocations per cache item.
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Now pre- and post-combining operations are clearly separated,
many parameters in cache keys are no longer necessary due to that.
Also an ambiguous (in case of multiple fonts) text string is replaced
with a list of direct bitmap references in composite cache key.
Fixes #153.
Fixes #82.
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HarfBuzz' FreeType font functions do not cache anything and call
FT_Load_Glyph all the time, which can be slow. Add a cache for metrics
and use it with custom font functions.
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Similarly to the glyph cache, subclass the bitmap cache to allow both
outline bitmaps and clipping mask bitmaps to coexist in the same cache
in a much cleaner way.
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Glyphs and drawings have wildly different hash keys. Subclass the hash
keys of glyphs and drawings in a new, unified outline cache. This also
fixes some issues with drawings in the glyph cache. Now, the textual
description of the drawing is included in the key (the hash value isn't
really good enough, especially not fnv32) and the baseline offset is
saved as well.
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This introduces functions to use and copy pointered outline objects
easily and uses these instead of glyphs everywhere.
Previously the glyph cache was abused for caching vector clipping masks,
but this isn't possible anymore (nor desirable), thus vector clipping
cache has been disabled for the moment.
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- less code, cleaner
- decoupled from ASS_Library
- better data encapsulation
- simpler interface
- avoids a nasty hack
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In hope to make libass as useful as possible, relicense libass to ISC, a
simplified 2-clause BSD license. All contributors who provided
non-trivial changes have granted their permission for this.
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Rename all typedefs from the convention foo_bar_t, which can possibly
conflict with POSIX types, to FooBar (and ASS_FooBar for public
API typedefs). Fix formatting and stray comments while at it.
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Remove useless _s suffix from struct names and remove struct name where
not needed (only the typedef'd struct is used). Clean up API headers.
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libass' cache was basically unmanaged; it would grow without any limits,
depending on how complex the subtitles are. Introduce a simple limiting
that resets the cache if certain limits are exceeded. The bitmap cache
is limited to approx. 50 MB size by default, while the glyph cache
allows storing up to 1000 glyphs by default. A few tests with rather
heavily softsubbed fansubs show that these limits are fine.
The API was extended with the function ass_set_cache_limits which allows
modification of these limits.
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Rename ass_cache_template.c to ass_cache_template.h; add libass.sym to
EXTRA_DIST.
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Introduce functionality for providing a message callback that is used
for passing messages to the controlling application instead of simply
printing them to standard output. The function pointer to the callback
is stored in the ass_library_t instance. ass_msg needs access to it, so
in many places the library instance needs to be passed around now.
The default behavior is the old one: messages of MSGL_INFO or lower
are printed to the standard output, prefixed with "[ass]".
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Finally implement the drawing mode, which allows drawing of custom
vector graphics. Drawings are intercepted in ass_render_event; a hash
of the drawing string is generated which is then used for looking
up drawings and bitmaps of drawings in the cache. The drawings
itself are "fake" glyphs. They are created by parsing the simple
drawing description language, evaluating the curves described (lines,
cubic beziers and/or a special kind of b-splines) and creating vector
outlines. Afterwards, these drawings are (with a few exceptions, e.g.
ascender/descender) exactly handled like regular glyphs.
Support for vector clippings is still missing, but otherwise the
implementation should be complete and compatible with VSFilter.
The libass integration of the drawing parsing/processing code is still a
bit sketchy and should be refactored.
History:
WIP: Drawing mode infrastructure
WIP: Drawing tokenizer
WIP: Parse drawing tokens, call evaluators
WIP: Bezier/b-spline evaluator
WIP: Final pieces for the drawing mode
WIP: Heavy modifications to the drawing parser/tokenizer
WIP: Dynamic outline memory allocation
WIP: Drawing position fixes
WIP: more drawing position fixup (similar to VSFilter now)
WIP: Lots of cleanup and fixes for drawings.
WIP: Drawing mode integration into ass_render_event
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Previously the composite bitmap hash keys were compared and hashed
based on all the bytes in the struct, which could cause problems
because of padding bytes. Change the code to use field-by-field
operations as already done for other hash key types.
The composite hash key contains two bitmap hash keys. The hashing
function currently handles those by calling the function to calculate
the corresponding bitmap hash, and then updating the composite hash by
treating the result of the function call as a byte buffer. An
alternative would be to change the hash functions so that the initial
hash value could be passed as a parameter to the recursively called
function.
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Reindent complete source code (*.c, *.h) with indent, the exact command
line being:
indent -kr -i4 -bap -nut -l76 *.c *.h
From now on, new code should use (more or less) K&R style,
only spaces and no tabs, 4 spaces indent width. Avoid long lines.
Fix function declaration pointer spacing.
Remove spaces that were added to many function declarations by indent,
like some_func(foo_t * bar).
Fix indenting of macros in ass.c
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that is part of ass_renderer.
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The cache code did hash lookups by storing key values in struct fields
and then hashing and comparing the struct as a single memory block. In
at least one case such a struct contained uninitialized padding bytes
which prevented the complete memory area of the struct from matching
even though the fields did. As a result the code failed to find
existing objects in the cache and stored new versions of them, causing
gigabytes of memory use in some circumstances. Initializing the struct
memory to zero before writing the fields avoided such memory use in
tests but is not guaranteed to work if I interpret the C standard
correctly (the compiler is allowed to write garbage over padding bytes
when changing struct member values).
Change the code to use struct-specific hashing and comparison
functions that work field by field to guarantee correct behavior.
Create these by replacing the struct definition with a template that
lists the fields and can be used the generate each of struct
definition, hash function and compare function with some preprocessor
magic (otherwise every field would need to be listed separately in all
three).
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@29305 b3059339-0415-0410-9bf9-f77b7e298cf2
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avoid luminance build-up, which looks ugly.
The resulting, modified bitmaps are stored in separate bitmap cache.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28824 b3059339-0415-0410-9bf9-f77b7e298cf2
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Patch by Grigori G, greg at chown ath cx.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28471 b3059339-0415-0410-9bf9-f77b7e298cf2
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We already use LIBASS_ prefixes for the multiple inclusion guards.
Thus libass can be considered separate enough to warrant this.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26770 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26755 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26170 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25927 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25563 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23709 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23318 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23229 b3059339-0415-0410-9bf9-f77b7e298cf2
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(glyph border obtained with FT_Glyph_StrokeBorder) since r23043.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23188 b3059339-0415-0410-9bf9-f77b7e298cf2
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bitmap glyph key. Result of rotation depends on them because of perspective
transformation. They are only set when some rotation take place.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23046 b3059339-0415-0410-9bf9-f77b7e298cf2
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They are now available from glyph cache.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23044 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23043 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23036 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23035 b3059339-0415-0410-9bf9-f77b7e298cf2
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Reimplement both font cache and glyph cache on top of it.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23034 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@22233 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@22232 b3059339-0415-0410-9bf9-f77b7e298cf2
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glyphs in cache.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21364 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21339 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21337 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21333 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21293 b3059339-0415-0410-9bf9-f77b7e298cf2
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Use it to access the font face.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21283 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21282 b3059339-0415-0410-9bf9-f77b7e298cf2
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face_desc_t -> ass_font_desc_t
face_cache_item_t -> ass_font_t
*face* -> *font*
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21281 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@20014 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19971 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19854 b3059339-0415-0410-9bf9-f77b7e298cf2
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This is required for various bitmap modifications (like blur, outline and shadow).
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19852 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19545 b3059339-0415-0410-9bf9-f77b7e298cf2
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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@18942 b3059339-0415-0410-9bf9-f77b7e298cf2
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