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# Building PDFium
## Prerequisites
Get the chromium depot tools via the instructions at
http://www.chromium.org/developers/how-tos/install-depot-tools (this provides
the gclient utilty needed below).
Also install Python, Subversion, and Git and make sure they're in your path.
Optionally, you may want to install the [Ninja](http://martine.github.io/ninja/)
build system (recommended) rather than using your platform-specific build
system.
## Get the code
```
mkdir pdfium
cd pdfium
gclient config --name . --unmanaged https://pdfium.googlesource.com/pdfium.git
gclient sync
```
## Generate the build files
Now we use the GYP library to generate the build files.
At this point, you have two options. The first option is to use the [Ninja]
(http://martine.github.io/ninja/) build system. This is the default as of
mid-September, 2015. Previously, the second option was the default. Most PDFium
developers use Ninja, as does our [continuous build system]
(http://build.chromium.org/p/client.pdfium/).
On Windows: `build\gyp_pdfium
` For all other platforms: `build/gyp_pdfium
`
The second option is to generate platform-specific build files, i.e. Makefiles
on Linux, sln files on Windows, and xcodeproj files on Mac. To do so, set the
GYP\_GENERATORS environment variable appropriately (e.g. "make", "msvs", or
"xcode") before running the above command.
## Building the code
If you used Ninja, you can build the sample program by: `ninja -C out/Debug
pdfium_test
` You can build the entire product (which includes a few unit tests) by: `ninja
-C out/Debug
`
If you're not using Ninja, then building is platform-specific.
On Linux: `make pdfium_test
`
On Mac, open build/all.xcodeproj
On Windows, open build\all.sln
## Running the sample program
The pdfium\_test program supports reading, parsing, and rasterizing the pages of
a .pdf file to .ppm or .png output image files (windows supports two other
formats). For example: `out/Debug/pdfium_test --ppm path/to/myfile.pdf
`
## Waterfall
The current health of the source tree can be found at
http://build.chromium.org/p/client.pdfium/console
## Branches
There is a branch for a forthcoming feature called XFA that you can get by
following the steps above, then: `git checkout origin/xfa build/gyp_pdfium ninja
-C out/Debug
`
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