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This requires a slight change to the device interface.
Callers that use fz_begin_tile will see no change (and no caching
will be done). We add a new fz_begin_tile_id function that takes an
extra 'id' parameter, and returns 0 or 1. If the id is 0 then the
function behaves exactly as fz_being_tile does, and always returns 0.
The PDF and XPS code continues to call the old (uncached) version.
The display list code however generates a unique id for every
BEGIN_TILE node, and passes this in.
If the id is non zero, then it is taken to be a unique identifier
for this tile; the implementer of the fz_begin_tile_id entry point
can choose to use this to implement caching. If it chooses to ignore
the id (and do no caching), it returns 0.
If the device implements caching, then it can check on entry for a
previously rendered tile with the appropriate matrix and a matching id.
If it finds one, then it returns 1. It is the callers responsibility
to then skip over all the device calls that would usually happen to
render the tiles (i.e. to skip forward to the matching 'END_TILE'
operation).
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When running under Windows, replace fopen with our own fopen_utf8
that converts from utf8 to unicode before calling the unicode
version of fopen.
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Use of the bbox device to derive the area of the display list can lead
to bad results because of heuristics used to handle corners of stroked
paths.
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Thanks to zeniko.
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Also, move fz_is_infinite_rect and fz_is_empty_rect to be a static
inline rather than a macro. (Static inlines are preferred over
macros by at least one customers).
We appear to be calling them with bboxes too, so add fz_is_infinite_bbox
and fz_is_empty_bbox to solve this.
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This is faster on ARM in particular. The primary changes involve
fz_matrix, fz_rect and fz_bbox.
Rather than passing 'fz_rect r' into a function, we now consistently
pass 'const fz_rect *r'. Where a rect is passed in and modified, we
miss the 'const' off. Where possible, we return the pointer to the
modified structure to allow 'chaining' of expressions.
The basic upshot of this work is that we do far fewer copies of
rectangle/matrix structures, and all the copies we do are explicit.
This has opened the way to other optimisations, also performed in
this commit.
Rather than using expressions like:
fz_concat(fz_scale(sx, sy), fz_translate(tx, ty))
we now have fz_pre_{scale,translate,rotate} functions. These
can be implemented much more efficiently than doing the fully
fledged matrix multiplication that fz_concat requires.
We add fz_rect_{min,max} functions to return pointers to the
min/max points of a rect. These can be used to in transformations
to directly manipulate values.
With a little casting in the path transformation code we can avoid
more needless copying.
We rename fz_widget_bbox to the more consistent fz_bound_widget.
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Various functions in the code output to FILE *, when there are times
we'd like them to output to other things, such as fz_buffers.
Add an fz_output type, together with fz_printf to allow things to
output to this.
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It used to be called fz_bbox_covering_rect. It does exact rounding outwards
of a rect, so that the resulting irect will always cover the entire
area of the input rect.
Use fz_round_rect for fuzzy rounding where near-integer values are
rounded inwards.
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Inside the renderer we often deal with integer sized areas, for
pixmaps and scissoring regions. Use a new fz_irect type in these
places.
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Simple patch to replace const char * with char *. I made the patch
myself, but I suspect it's extremely close to the one submitted
by Evgeniy A Dushistov, who reported the bug - many thanks!
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While investigating samples_mupdf_001/2599.pdf.asan.58.1778, a leak
showed up while cleaning the file, due to not dropping an object in
an error case.
mutool clean -dif samples_mupdf_001/2599.pdf.asan.58.1778 leak.pdf
Simple Fix. Also extend PDF writing so that it can cope with skipping
errors so we at least get something out at the end.
Problem found in a test file supplied by Mateusz "j00ru" Jurczyk and
Gynvael Coldwind of the Google Security Team using Address Sanitizer.
Many thanks!
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Two problems with tiling are fixed here.
Firstly, if the tiling bounds are huge, the 'patch' region (the region
we are writing into), can overflow, causing a SEGV due to the paint code
being very confused by pixmaps that go from just under INT_MAX to just
over INT_MIN. Fix this by checking explicitly for overflow in these
bounds.
If the tiles are stupidly huge, but the scissor is small, we can end up
looping many more times than we need to. We fix mapping the scissor
region back through the inverse transform, and intersecting this
with the pattern area.
Problem found in 4201.pdf.SIGSEGV.622.3560, a test file supplied by
Mateusz "j00ru" Jurczyk and Gynvael Coldwind of the Google Security
Team using Address Sanitizer. Many thanks!
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When calculating the bbox for draw_glyph, if the x and y origins of
the glyph are extreme (too large to fit in an int), we get overflows
of the bbox; empty bboxes are transformed to large ones.
The fix is to introduce an fz_translate_bbox function that checks for
such things.
Also, we update various bbox/rect functions to check for empty bboxes
before they check for infinite ones (as a bbox of x0=0 x1=0 y0=0 y1=-1
will be detected both as infinite and empty).
Problem found in 2485.pdf.SIGSEGV.2a.1652, a test file supplied by
Mateusz "j00ru" Jurczyk and Gynvael Coldwind of the Google Security
Team using Address Sanitizer. Many thanks!
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Whenever we have an error while pushing a gstate, we run the risk of
getting confused over how many pops we need etc.
With this commit we introduce some checking at the dev_null level that
attempts to make this behaviour consistent.
Any caller may now assume that calling an operation that pushes a clip
will always succeed. This means the only error cleanup they need to
do is to ensure that if they have pushed a clip (or begun a group, or
a mask etc) is to pop it too.
Any callee may now assume that if it throws an error during the call
to a device entrypoint that would create a group/clip/mask then no more
calls will be forthcoming until after the caller has completely finished
with that group.
This is achieved by the dev_null layer (the layer that indirects from
device calls through the device structure to the function pointers)
swallowing errors and regurgitating them later as required. A count is
kept of the number of pushes that have happened since an error
occurred during a push (including that initial one). When this count
reaches zero, the original error is regurgitated. This allows the
caller to keep the cookie correctly updated.
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Throwing from within the always block is bad practice, but attempt
to cope with it gracefully.
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Thanks to zeniko for these.
Use otf as extension for opentype fonts.
fz_clampi should take ints, not floats!
Fix typo in prototype.
Squash unwanted warning.
Remove magic number in favour of #define.
Reset generation numbers when renumbering.
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Regenerate dirty appearance streams and report changed annotations since
last call.
Also include a partial revert of changes in 96f335bc, that turn out not
to be necessary.
fz_update_page must now be called between each document-changing event and
the next render. pdfapp.c and the android app have been updated to do so,
but do not yet take advantage of the possibility to render only the updated
areas of the screen.
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Only Fade, Wipe and Blinds supported so far.
Hit 'p' in the viewer to go into 'presentation' mode. Page swaps
then transition from page to page. Pages auto advance until key
or mouse is used.
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Also add a function to report whether the core has javascript support,
so that the additional features can be enabled only when the javascript
engine is present
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app.execDialog looks very difficult to support. Hopefully we wont have to
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The name of the menu item is passed, so presumably the app could respond
to some of the possibilities.
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Conflicts:
pdf/pdf_xref_aux.c
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Conflicts:
cbz/mucbz.c
pdf/pdf_parse.c
pdf/pdf_form.c
xps/xps_zip.c
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Use a "magic" string for filetype detection: filename or mime-type.
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Mountian Lion causes various different warnings to be given,
possibly because a change to clang by default. Fix them here.
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Conflicts:
Makefile
apps/mudraw.c
pdf/pdf_write.c
win32/libmupdf-v8.vcproj
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Rather than specifically checking for the nesting getting too deep and
hence throwing an error, the error handling should do this for itself.
Make it so that we spot the depth being too great in the fz_try() and
throw to the fz_catch().
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Previously we would run out of error stacks in the context and fail abruptly.
Now, throw an exception and hope for the best. At least this plugs any memory
leaks.
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