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John Cupitt e4d38d1d3e clip out of bounds GIF images against the canvas 
Some malformed GIFs have images which lie outside or partly outside the canvas.
With this patch, these frames are clipped and rendered.

Previously, these GIFs were rejected.

See https://github.com/libvips/libvips/issues/1701
2020-07-02 16:41:37 +01:00

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# libvips : an image processing library
[![Build Status](https://travis-ci.org/libvips/libvips.svg?branch=master)](https://travis-ci.org/libvips/libvips)
[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/libvips.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=2&q=proj:libvips)
[![Coverity Status](https://scan.coverity.com/projects/6503/badge.svg)](https://scan.coverity.com/projects/jcupitt-libvips)
# Introduction
libvips is a [demand-driven, horizontally
threaded](https://github.com/libvips/libvips/wiki/Why-is-libvips-quick)
image processing library. Compared to similar
libraries, [libvips runs quickly and uses little
memory](https://github.com/libvips/libvips/wiki/Speed-and-memory-use).
libvips is licensed under the [LGPL
2.1+](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html).
It has around [300
operations](http://libvips.github.io/libvips/API/current/func-list.html)
covering arithmetic, histograms, convolution, morphological
operations, frequency filtering, colour, resampling,
statistics and others. It supports a large range of [numeric
types](http://libvips.github.io/libvips/API/current/VipsImage.html#VipsBandFormat),
from 8-bit int to 128-bit complex. Images can have any number of bands.
It supports a good range of image formats, including JPEG, TIFF, PNG,
WebP, HEIC, FITS, Matlab, OpenEXR, PDF, SVG, HDR, PPM / PGM / PFM, CSV,
GIF, Analyze, NIfTI, DeepZoom, and OpenSlide. It can also load images via
ImageMagick or GraphicsMagick, letting it work with formats like DICOM.
It comes with bindings for
[C](http://libvips.github.io/libvips/API/current/using-from-c.html),
[C++](http://libvips.github.io/libvips/API/current/using-from-cpp.html),
and the
[command-line](http://libvips.github.io/libvips/API/current/using-cli.html).
Full bindings are available for [Ruby](https://rubygems.org/gems/ruby-vips),
[Python](https://pypi.python.org/pypi/pyvips),
[PHP](https://github.com/libvips/php-vips),
[C# / .NET](https://www.nuget.org/packages/NetVips),
[Go](https://github.com/davidbyttow/govips), and
[Lua](https://github.com/libvips/lua-vips). libvips
is used as an image processing engine by [sharp
(on node.js)](https://www.npmjs.org/package/sharp),
[bimg](https://github.com/h2non/bimg), [sharp
for Go](https://github.com/DAddYE/vips), [Ruby on
Rails](http://edgeguides.rubyonrails.org/active_storage_overview.html),
[carrierwave-vips](https://github.com/eltiare/carrierwave-vips),
[mediawiki](http://www.mediawiki.org/wiki/Extension:VipsScaler),
[PhotoFlow](https://github.com/aferrero2707/PhotoFlow) and others.
The official libvips GUI is [nip2](https://github.com/libvips/nip2),
a strange combination of a spreadsheet and an photo editor.
# Install
There are packages for most Unix-like operating systems, including
macOS. Check your package manager.
There are binaries for Windows in
[releases](https://github.com/libvips/libvips/releases).
The [libvips website](https://libvips.github.io/libvips) has [detailed
install notes](https://libvips.github.io/libvips/install.html).
# Building libvips from a source tarball
We keep pre-baked tarballs in
[releases](https://github.com/libvips/libvips/releases).
Untar, then in the libvips directory you should just be able to do:
./configure
Check the summary at the end of `configure` carefully. libvips must have
`build-essential`, `pkg-config`, `libglib2.0-dev`, `libexpat1-dev`.
You'll need the dev packages for the file format support you want. For basic
jpeg and tiff support, you'll need `libtiff5-dev`, `libjpeg-turbo8-dev`,
and `libgsf-1-dev`. See the **Dependencies** section below for a full list
of the things that libvips can be configured to use.
Once `configure` is looking OK, compile and install with the usual:
make
sudo make install
By default this will install files to `/usr/local`.
# Testing
Run the test suite with:
make check
Run a specific test with:
pytest test/test-suite/test_foreign.py -k test_tiff
# Building libvips from git
Clone the latest sources with:
git clone git://github.com/libvips/libvips.git
Building from git needs more packages -- you'll need at least `gtk-doc`
and `gobject-introspection`, see the dependencies section below. For example:
brew install gtk-doc
Then generate the build system with:
./autogen.sh --prefix=/home/john/vips
Debug build:
CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" \
./configure --prefix=/home/john/vips --enable-debug
make
make install
# Dependencies
libvips has to have `libglib2.0-dev` and `libexpat1-dev`. Other dependencies
are optional.
## Optional dependencies
If suitable versions are found, libvips will add support for the following
libraries automatically. See `./configure --help` for a set of flags to
control library detection. Packages are generally found with `pkg-config`,
so make sure that is working.
Libraries like giflib and nifti do not use `pkg-config` so libvips will also
look for them in the default path and in `$prefix`. If you have installed
your own versions of these libraries in a different location, libvips will
not see them. Use switches to libvips configure like:
./configure --prefix=/Users/john/vips \
--with-giflib-includes=/opt/local/include \
--with-giflib-libraries=/opt/local/lib
or perhaps:
CFLAGS="-g -Wall -I/opt/local/include -L/opt/local/lib" \
CXXFLAGS="-g -Wall -I/opt/local/include -L/opt/local/lib" \
./configure --prefix=/Users/john/vips
### libjpeg
The IJG JPEG library. Use the `-turbo` version if you can.
### libexif
If available, libvips adds support for EXIF metadata in JPEG files.
### giflib
The standard gif loader. If this is not present, vips will try to load gifs
via imagemagick instead.
### librsvg
The usual SVG loader. If this is not present, vips will try to load SVGs
via imagemagick instead.
### PDFium
If present, libvips will attempt to load PDFs via PDFium. This library must be
packaged by https://github.com/jcupitt/docker-builds/tree/master/pdfium
If PDFium is not detected, libvips will look for poppler-glib instead.
### poppler-glib
The Poppler PDF renderer, with a glib API. If this is not present, vips
will try to load PDFs via imagemagick.
### libgsf-1
If available, libvips adds support for creating image pyramids with `dzsave`.
### libtiff
The TIFF library. It needs to be built with support for JPEG and
ZIP compression. 3.4b037 and later are known to be OK.
### fftw3
If libvips finds this library, it uses it for fourier transforms.
### lcms2
If present, `vips_icc_import()`, `vips_icc_export()` and `vips_icc_transform()`
are available for transforming images with ICC profiles.
### libpng
If present, libvips can load and save png files.
### libimagequant
If present, libvips can write 8-bit palette-ised PNGs.
### ImageMagick, or optionally GraphicsMagick
If available, libvips adds support for loading all libMagick-supported
image file types. Use `--with-magickpackage=GraphicsMagick` to build against
graphicsmagick instead.
Imagemagick 6.9+ needs to have been built with `--with-modules`. Most packaged
IMs are, I think.
If you are going to be using libvips with untrusted images, perhaps in a
web server, for example, you should consider the security implications of
enabling a package with such a large attack surface.
### pangoft2
If available, libvips adds support for text rendering. You need the
package pangoft2 in `pkg-config --list-all`.
### orc-0.4
If available, vips will accelerate some operations with this run-time
compiler.
### matio
If available, vips can load images from Matlab save files.
### cfitsio
If available, vips can load FITS images.
### libwebp
If available, vips can load and save WebP images.
### libniftiio
If available, vips can load and save NIfTI images.
### OpenEXR
If available, libvips will directly read (but not write, sadly)
OpenEXR images.
### OpenSlide
If available, libvips can load OpenSlide-supported virtual slide
files: Aperio, Hamamatsu, Leica, MIRAX, Sakura, Trestle, and Ventana.
### libheif
If available, libvips can load and save HEIC images.
# Contributors
### Code Contributors
This project exists thanks to all the people who contribute.
<a href="https://github.com/libvips/libvips/graphs/contributors"><img src="https://opencollective.com/libvips/contributors.svg?width=890&button=false" /></a>
### Organizations
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