2015-11-06 19:29:06 +00:00
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Skia Debugger
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=============
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Introduction
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------------
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The Skia Debugger is a graphical tool used to step through and analyze the
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contents of the Skia picture format. Pre-requisites include installing the Qt
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Library and downloading the Skia code base.
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Qt is available here: http://qt-project.org/downloads.
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It can also be installed on linux using
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<!--?prettify?-->
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~~~~
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sudo apt-get install libqt4-dev
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~~~~
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Note that the debugger has been tested with Qt 4.8.6; it is known not to work
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with Qt 5.0RC1 on the Mac.
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Design Documents:
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https://docs.google.com/a/google.com/document/d/1b8muqVzfbJmYbno9nTv5721V2nlFMfnqXYLNHiSQ4ws/pub
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How to build and run
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--------------------
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Because the debugger uses Qt, you'll need to build skia in 64 bit mode:
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<!--?prettify?-->
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2015-11-13 12:29:59 +00:00
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GYP_DEFINES="skia_arch_width=64" python bin/sync-and-gyp
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ninja -C out/Debug debugger
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out/Debug/debugger
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2015-11-06 19:29:06 +00:00
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For Windows, Qt ships as 32 bit libraries so to build and run one should just be
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able to:
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<!--?prettify?-->
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~~~~
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cd trunk
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make clean gyp
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<open solution in VS2010 and build everything>
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~~~~
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Depending on how your Qt is installed you may also need to define an environment
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variable like:
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~~~~
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GYP_DEFINES=qt_sdk='C:\Qt\4.8.6\'
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~~~~
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(which needs to be set before you execute 'make gyp')
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On Windows, you may need to copy several DLL and PDB files from %QTDIR%\bin into
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your executable directory (out/Debug or out/Release):
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QtCore4.dll QtCored4.dll QtCored4.pdb
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QtGui4.dll QtGuid4.dll QtGuid4.pdb
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QtOpenGL4.dll QtOpenGLd4.dll QtOpenGLd4.pdb
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Producing SKPs for usage
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------------------------
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You may either use the Skia testing images (GMs) for use in the debugger or
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create your own via chromium.
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To create SKPs from Chromium you must download and build chromium on your
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platform of choice: http://www.chromium.org/Home
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<!--?prettify?-->
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~~~~
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cd src
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make chrome
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out/Debug/chrome --no-sandbox --enable-gpu-benchmarking --force-compositing-mode
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~~~~
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After which go to Tools, Settings, Javascript Console and type:
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<!--?prettify?-->
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~~~~
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chrome.gpuBenchmarking.printToSkPicture(dirname)
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~~~~
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Using the Debugger
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------------------
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The debugger is fairly straight forward to use once a picture is loaded in. We
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can step through different commands via the up and down keys, and clicking on
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the command in the list. We can pause execution of commands with the pause
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button in order to inspect the details of the command in the inspector tabs
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down below.
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Command | Function
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-------------|-----------------------------------------------
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x | toggles the visibility of the selected command
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alt-x | clears all hidden commands
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ctrl-x | shows all deleted commands
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b | creates a breakpoint on a command
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alt-b | clears all breakpoints
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ctrl-b | shows all breakpoints
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ctrl-r | rewinds the picture to the first command
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ctrl-p | plays to the next breakpoint or last command
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ctrl-i | Toggles the inspector and settings widgets
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ctrl-d | Toggles the directory widget
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space | Pauses drawing execution
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ctrl-o | Opens a file dialog for loading pictures
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ctrl-s | Saves the skp if you deleted any commands
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ctrl-shift-s | Saves the skp under the new specified name
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ctrl-q | Quits
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