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The check for width and height being stupidly large
solves a SEGV that shows up while fuzzing.
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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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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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With a small dst_w (e.g. 1e-23) the floating point maths governing
scales can go wrong in the weight calculations. MSVC in particular
seems to return 1<<31 for the result of the max_len calculation.
It makes no real sense to scale bitmaps to < 1 pixel, so simply clamp
width and height as required.
Problem found in 2923.pdf.asan.22.2139, 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 extreme ranges (+/- MAX_INT) are passed into the scaler
signed wrap around gives us problems when calculating the patch.
Simply ignore such cases.
Problem found in 1792.pdf.SIGSEGV.387.883, 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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This means that repeated scaling of the same pixmap (or scales of
'stacked' pixmaps) will do less needless recalculation.
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By manually inserting a literal pool, we can avoid the need to
split draw_simple_scale.c out.
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Move the assembly macros into fitz-internal.h.
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This avoids a stall, and saves time on repeated loops.
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Requires android-ndk-profiler to be copied into android and android/jni.
Also requires r8c of the NDK.
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The scale_row_from_temp code was broken. Firstly the rounding was wrong
in the 'bulk' case (not a big deal), but more importantly on
configurations where unaligned loads were not allowed (such as the nook),
we could still crash due to an incorrect test to avoid that code.
Thanks to Kammerer for the report, and testing of fixed version.
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Attempt to separate public API from internal functions.
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On extreme downscales, the weights for each pixel can all round to
zero; this results in no weights being stored at all, and causes
either an exception or a SEGV. The simple fix is to ensure that the
first pixel that's actually in range (and there will always be one)
always has a weight of at least 1.
Thanks to malc for finding the test cases that lead to this bugfix.
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The ARM optimised code relied on the size of the weights structure
which was changed by the addition of a new member as part of the
patch scaling changes. Fix the code here, and add a note to the
structure in the hopes that this will avoid such breakages happening
in future.
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When scaling a bitmap, currently we always scale the entire bitmap,
even if we only need a small section of the result.
This patch changes the code to take an optional 'clip' bbox, and
only scales as many pixels as are required to generate the required
output region.
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This reverts commit 08e84b18e5c1dbe8f3d32dd0aeb4b4c43debce9f.
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When scaling a bitmap, currently we always scale the entire bitmap,
even if we only need a small section of the result.
This patch changes the code to take an optional 'clip' bbox, and
only scales as much of the input as as required for this output
region.
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Also: use 'cannot' instead of 'failed to' in error messages.
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Mostly redoing the xps_context to xps_document change and adding
contexts to newly written code.
Conflicts:
apps/pdfapp.c
apps/pdfapp.h
apps/x11_main.c
apps/xpsdraw.c
draw/draw_device.c
draw/draw_scale.c
fitz/base_object.c
fitz/fitz.h
pdf/mupdf.h
pdf/pdf_interpret.c
pdf/pdf_outline.c
pdf/pdf_page.c
xps/muxps.h
xps/xps_doc.c
xps/xps_xml.c
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Extract the grid fitting code from the scaling code and the affine image
drawing code into it's own separate function. This reduces code
duplication. It also allows us to make better allowance for rounding
errors.
Add a voodoo offset in the draw_affine.c code for painting interpolated
images. This gives us the best possible match between all the different
combinations of scaled/unscaled and interpolated/uninterpolated images.
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draw_simple_scale.c is a cut down version of draw_scale.c, that only
uses filter functions that return values strictly in the 0 to 1 range.
Because of that, we can use bytes rather than ints as intermediate
storage, and have no clipping to do.
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