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path: root/core/fxcodec/gif/cfx_gifcontext.cpp
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2017-10-23Return error when attempting to load frame with 0 heightRyan Harrison
A frame with 0 height will have no data, so there is not point in attempting to load it. Additionally some of the loading code assumes a non-zero height implicitly. BUG=chromium:770470 Change-Id: I38b222b46b43ce5d47924526913285510be40603 Reviewed-on: https://pdfium-review.googlesource.com/16551 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-10-05Make GIF decoder more standards complaintRyan Harrison
Fixed issue with unit tests that was causing raw data to be backwards and reverted related LSB -> MSB change that was introduced due to this. If global palette not set then the background colour index should be 0. Check that background colour index is valid when global palette exists. Check if transparency index is valid for the palette of the frame it is being applied to. BUG=chromium:770337 Change-Id: I5d9b648f45bbb4c93218664a7035e4d01dbeb627 Reviewed-on: https://pdfium-review.googlesource.com/15453 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-10-03Rewrite how GIF headers are readRyan Harrison
Break up reading the signature and local screen descriptors into seperate functions. Fix a bug in how matching in the signature validation works. Move LSD value assignment to after sufficient data has been confirmed. Convert LSB to MSB methods where they were just wrong. Add unit tests for ReadData, SetInputBuffer, ReadSignature, ReadLocalScreenDescriptor, and ReadHeader. BUG=pdfium:913,chromium:770470 Change-Id: I1683b8aefc11300625b9be8087c6988549308a8f Reviewed-on: https://pdfium-review.googlesource.com/15250 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2017-10-02Replace GetWord_LSBFirst with FXWORD_GET_LSBFIRSTchromium/3231Ryan Harrison
The existing implementation of a LSB first word method was incorrect, in addition it was implemented to the BMP code, but also used in the GIF code. Thus is should be moved to a common location. Also added in an implementation for FXWORD_GET_MSBFIRST, since the GIF code will need this. BUG=pdfium:914 Change-Id: I0e84813356fbd456b293a190da3c2cde01a6580b Reviewed-on: https://pdfium-review.googlesource.com/15210 Reviewed-by: Tom Sepez <tsepez@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2017-09-27Cleaning up naming of GIF files/classes/variablesRyan Harrison
Moved everything from core/fxcodec/lgif to core/fxcodec/gif Converted CGifContext -> CFX_GifContext Removed _ptr suffixes from CXF_GifContext Movef fx_gif.* -> cfx_gif.* Renamed structs in cfx_gif.h Renamed members of CFX_GifImage Renamed members of CFX_GifContext Renamed CFX_LZWDecoder -> CFX_LZWDecompressor BUG=pdfium:903 Change-Id: I537e905e935da26832e6bbdc03e0373ed5500bcb Reviewed-on: https://pdfium-review.googlesource.com/14990 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>