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2018-01-22Use MaybeLocal versions of v8::Script APIsAdam Klein
The non-Maybe versions will soon be deprecated. Where the code was already handling failures, I did the same; where the code was not handling failures, I inserted ToLocalChecked() calls. Thus the behavior before and after this patch should be the same. For consistency, also updated the use of v8::Function::Call in CFXJSE_Context::ExecuteScript() to the Maybe version, so that all code in that function now branches on the non-emptyness of MaybeLocals, rather than TryCatch::HasCaught(). ASSERTs were inserted to sanity-check the API usage. Bug: v8:7269, v8:7273, v8:7274 Change-Id: I59696e63a64a233a9f9c2b72c621a05b5e349a31 Reviewed-on: https://pdfium-review.googlesource.com/23270 Commit-Queue: Jochen Eisinger <jochen@chromium.org> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
2018-01-22Tests for composing CFX_Matrix transforms.Henrique Nakashima
Bug: pdfium:987 Change-Id: Ieee2850ceec12d6fff3ba6e0fb5a775e62c5c76e Reviewed-on: https://pdfium-review.googlesource.com/23230 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
2018-01-19Remove code added in by a bad rebase or mergechromium/3328chromium/3327chromium/3326Ryan Harrison
The guard being removed was moved lower down in the code, but it appears the original creeped back in while I was rebasing at some point. This is causing clusterfuzz failures. BUG=chromium:803732,chromium:803735 Change-Id: I5bcc6046e64d6060a674f390e243dd8eda9d1d17 Reviewed-on: https://pdfium-review.googlesource.com/23250 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-19Fix CFX_Matrix.RotateAt()Henrique Nakashima
The translations were in the opposite order they should be. First the specified (x, y) coord needs to be translated to the origin, then rotation should be applied, then the translation should be reversed. To translate (x, y) to the origin, the initial translation should be Tx = -x, Ty = -y. Bug: pdfium:987 Change-Id: I7f873c6a20858bf7fd03e5fdb49020b196b44a1d Reviewed-on: https://pdfium-review.googlesource.com/23210 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: Nicolás Peña Moreno <npm@chromium.org> Reviewed-by: Shirleen Lou <xlou@chromium.org>
2018-01-19Remove NeedAlpha() in CFX_ImageTransformer.Lei Zhang
WriteColorResult(), which calls NeedAlpha(), runs on a per-pixel basis in CFX_ImageTransformer. NeedAlpha() repeats some conditional calculations. Remove that for a slight speed-up. Change-Id: I0bb3f92001b9ccdb65c4d59c9f832fe9edfa71f4 Reviewed-on: https://pdfium-review.googlesource.com/23175 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-01-18Add jumbo build support for fxge and pwl.Lei Zhang
This completes jumbo build support for non-XFA builds. BUG=pdfium:964 Change-Id: Ife4ed23f9b438623581a863685014e64a06cf0d8 Reviewed-on: https://pdfium-review.googlesource.com/22775 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-18Move XFA_IsCreateWidget to CXFA_ObjectDan Sinclair
This CL removes the free XFA_IsCreateWidget method and moves the functionality into CXFA_Object::HasCreatedUIWidget to clarify the purpose. Change-Id: Icca1f49238040b5d87fbb4eb33340f9309f5e2f3 Reviewed-on: https://pdfium-review.googlesource.com/23133 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-01-18Avoid integer overflows in CJBig2_Image::composeTo_opt2().Lei Zhang
BUG=chromium:802983 Change-Id: I866ece9c370bf05571b76b50ad23598f5038332b Reviewed-on: https://pdfium-review.googlesource.com/23151 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-01-18Declare variables closer to use in CJBig2_Image::composeTo_opt2().Lei Zhang
Change-Id: Ifabaf71bb45ffa7e9af7da4acb21d8757e9596ce Reviewed-on: https://pdfium-review.googlesource.com/23150 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-01-18Remove more unneeded includes and code from headers.Lei Zhang
Change-Id: I0a07dbc9850bef2184ed35ff04b08385fc1bdd17 Reviewed-on: https://pdfium-review.googlesource.com/22891 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-18Move format specific elements out of ContinueDecodeRyan Harrison
Refactoring the big image format switch in ContinueDecode to call separate methods for each image format, instead of having one giant switch block. This should have no functional changes. BUG=pdfium:976 Change-Id: Ide4892526ee823023c233f0e43b1c98ac8bd1477 Reviewed-on: https://pdfium-review.googlesource.com/23134 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Move format specific elements out of StartDecodechromium/3324Ryan Harrison
Refactoring the big image format switch in StartDecode to call separate methods for each image format, instead of having one giant switch block. This should have no functional changes. BUG=pdfium:976 Change-Id: I4e609ecaec0c5d0e173957c0795555b37c38f9a2 Reviewed-on: https://pdfium-review.googlesource.com/23131 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Move format specific elements out of DetectImageTypeRyan Harrison
Refactoring the big image format switch in DetectImageType to call separate methods for each image format, instead of having one giant switch block. This should have no functional changes. BUG=pdfium:976 Change-Id: I52cc83879da20b33d471420016f6b1eb53993f0b Reviewed-on: https://pdfium-review.googlesource.com/23130 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Remove redundant GetNodeDan Sinclair
The WidgetAcc of a node will return the node from GetNode. So, calling GetNode()->GetWidgetAcc()->GetNode() will return the same thing as GetNode(). Change-Id: I82bffb191fd539a6f9b1e4a72e8ffcba1bdc1cc9 Reviewed-on: https://pdfium-review.googlesource.com/23132 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove param checking from StartScanLineRyan Harrison
By catching this early we are now actually returning the wrong value. The bad value should be passed into the jpeg library code, which will cause a fatal error and jump out to the common error handling code for this method. BUG=pdfium:986 Change-Id: Ib3d32939aa38aece887c014c3a477407ee178193 Reviewed-on: https://pdfium-review.googlesource.com/23119 Commit-Queue: Ryan Harrison <rharrison@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Move remaining jpeg error handling up a levelRyan Harrison
This moves the setjmps needed for handling fatal errors in the jpeg library up a level to be in line with how other instances of this are being modified. This additionally reduces the number of times that setjmp needs to be called and documents why it is occurring. This covers the Start and ReadScanLine methods. It also adds in setting the error member, which had been missed in previous CLs. BUG=pdfium:986 Change-Id: I7db87288ffe0ee8b29899d97035c30ad812da76a Reviewed-on: https://pdfium-review.googlesource.com/23117 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Move jpeg header read error handling up a levelRyan Harrison
This move the setjmp needed for handling fatal errors in the jpeg library up a level to be in line with how other instances of this are being modified. This additionally reduces the number of times that setjmp needs to be called and documents why it is occuring. BUG=pdfium:986 Change-Id: Ia57821e1ce65aae811618effb3f2fa6256e1ab8c Reviewed-on: https://pdfium-review.googlesource.com/23115 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Pass Isolate to v8::String::Utf8Value APIAdam Klein
The non-Isolate version will soon be deprecated. Bug: v8:7269, v8:7282 Change-Id: I204e45bd73f5b809d6c44b77bbcf62d32e7ccbec Reviewed-on: https://pdfium-review.googlesource.com/23058 Reviewed-by: dsinclair <dsinclair@chromium.org> Reviewed-by: Jochen Eisinger <jochen@chromium.org> Commit-Queue: Jochen Eisinger <jochen@chromium.org>
2018-01-17Do more forward declarations in cxfa_node.h.Lei Zhang
Including cjx_node.h pulls in v8 headers for many XFA files. Change-Id: I80a32d0a56b8de5787db5275db48c568da6d0144 Reviewed-on: https://pdfium-review.googlesource.com/22890 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-17Fix behavior of FPDF_RenderPageBitmapWithMatrixHenrique Nakashima
This functional part of this CL is mostly a revert of "Change behaviour of FPDF_RenderPageBitmapWithMatrix" 24b0733a72bbc4013bff8628f198b0aea807aa06 Besides the revert, the parameters passed to pPage->GetDisplayMatrix() are changed to fix a bug with the previous implementation: the page was scaled to fit inside the clipping_rect, instead of clipped. Bug: pdfium:849 Change-Id: I95d0a303a979c998026a3bd6963c8684a1209f03 Reviewed-on: https://pdfium-review.googlesource.com/22931 Reviewed-by: Nicolás Peña Moreno <npm@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-01-17Move code related to stroke line dash to CXFA_StrokeDan Sinclair
This CL moves XFA_StrokeTypeSetLineDash into the CXFA_Stroke class and cleans up the unused CXFA_Graphics code for setting line dash values. Change-Id: If6db6c315571dbcea630bc32e0d05dae6c0f10be Reviewed-on: https://pdfium-review.googlesource.com/23114 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Cleanup some CXFA_Box methodsDan Sinclair
Shuffle some code around, make things a little cleaner. Change-Id: I4cbdf4fc7e7d0a372cdc5cb63b45ca196a037543 Reviewed-on: https://pdfium-review.googlesource.com/23113 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Rename box arc methods for clarityDan Sinclair
This CL renames the CXFA_Box arc methods to make it clear they aren't just for handling arcs. Change-Id: Id2fa16c572f9529d6a13a921d59c2dcbf8a50b7a Reviewed-on: https://pdfium-review.googlesource.com/23112 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Move GetFillpath to CXFA_RectangleDan Sinclair
This CL moves the code related to getting the fill path for rectangles to the CXFA_Rectangle class. Change-Id: I83c43c259d2decadaeb99d1f081f3972ddf8294e Reviewed-on: https://pdfium-review.googlesource.com/23111 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Move rectangle drawing code to CXFA_RectangleDan Sinclair
This CL moves code related to drawing rectangles to the CXFA_Rectangle class. This also turns CXFA_Border into a CXFA_Rectangle to share the drawing code. Change-Id: I91e2e73b33ecbcda477cf953cf7609310a01fcd4 Reviewed-on: https://pdfium-review.googlesource.com/23110 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Correctly handle errors when starting jpeg codecRyan Harrison
The current implementation treats both returning false and longjmp'ing out of jpeg_start_decompress as indicating that the decompression has paused and needs more data. This is incorrect, in reality only the false return value indicates this. The longjmp path indicates a fatal error in the processing of the jpeg. The default implementation actually calls exit() in this case, and the documentation explicitly calls out that in this case recovery isn't possible and the decode process will have to start from scratch. This resolves a situation where the progressive decoder would get a malformed jpeg and keep on grabbing blocks from it and try to start decoding it. This would eventually fail when it ran out of data to read, but would cause a large memory leak and a crash on the MSAN fuzzers. BUG=pdfium:986,chromium:798665 Change-Id: Ifd2ed7a2dc46fa20bab34e9c461a8d4c4718c4d7 Reviewed-on: https://pdfium-review.googlesource.com/23072 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-17Pass ios_base::binary so WriteBitmapToPng works on Windows.Henrique Nakashima
Bug: pdfium:981 Change-Id: I87d750cd8de079dfc61923fee58af42518f5b6d1 Reviewed-on: https://pdfium-review.googlesource.com/23090 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-01-17Move fill draw code to fill classesDan Sinclair
This CL moves the code related to drawing fills and the various types of fill to the specific fill classes. Change-Id: Ie151089b00ca96c5fa88d22ab5f697d9425297cd Reviewed-on: https://pdfium-review.googlesource.com/23071 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Move the box drawing code to CXFA_BoxDan Sinclair
This CL moves the code related to drawing boxes from CXFA_FFWidget to CXFA_Box. Change-Id: Ie69c59bb0b1eda1fcedbc26c6f8f30d53e2e268c Reviewed-on: https://pdfium-review.googlesource.com/23070 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-01-17Remove flags param from CXFA_ImageRendererDan Sinclair
The flags are always set to the same value. This CL removes them and inlines the value as needed. Change-Id: I379a053aee31829229d83291d666904564b99aea Reviewed-on: https://pdfium-review.googlesource.com/23057 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove transparency flag from CompositeDIBitmapDan Sinclair
The transparency flag was always false, this CL removes the flag and any code as needed. Change-Id: Ia4aecd7919b17c446c1b59361042e6a7444064af Reviewed-on: https://pdfium-review.googlesource.com/23056 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove m_BlendType from CXFA_ImageRendererDan Sinclair
The m_BlendType flag was never changed from the default. Removed. Change-Id: I0b347369339babf273c43861715d67f2f6bbfb17 Reviewed-on: https://pdfium-review.googlesource.com/23055 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove m_bPrint from CXFA_ImageRendererDan Sinclair
Remove the m_bPrint value from CXFA_ImageRenderer which is always false. Change-Id: Id4b1ea3328d1a7627526a503a8cd94a31e3c6091 Reviewed-on: https://pdfium-review.googlesource.com/23054 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove m_Result from CXFA_ImageRendererDan Sinclair
The m_Result value is set but never used. Remove. Change-Id: Iba9e9a27b5d08072e2f810e0c6f574cb6880c87b Reviewed-on: https://pdfium-review.googlesource.com/23053 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove bitmap ARGB from CFX_ImageRendererDan Sinclair
This CL removes the fill ARGB value from CFX_ImageRenderer which is always set to 0. Change-Id: I445abd6268c14f05184988177b2fa6b80f50d41d Reviewed-on: https://pdfium-review.googlesource.com/23052 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Remove bitmap alpha from CXFA_ImageRendererDan Sinclair
The bitmap alpha value is always set to 255, this CL removes the parameter and passes 255 directly where needed. Change-Id: I435fbdd00121cae4dda0e2a790b339993f5e8a07 Reviewed-on: https://pdfium-review.googlesource.com/23051 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-17Fold CXFA_ImageRenderer::Start into constructorDan Sinclair
This CL moves the code to initialize the variables into the constructor and changes the Start command into the StartDIB command. Change-Id: Iba3c1dcd9a872b4e2a1eadf87050f39c73b8e704 Reviewed-on: https://pdfium-review.googlesource.com/23050 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-16Add asm.js to supported platformsHenrique Nakashima
Change-Id: I46eb5789b303040f4e62d39882f32537f637e01a Reviewed-on: https://pdfium-review.googlesource.com/22970 Reviewed-by: Tom Sepez <tsepez@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-01-16Clean up xfa/fde/cfde_textout.h.Lei Zhang
- Move enums/structs other than CFDE_TextOut to a separate header. - Move CFDE_TTOLine into CFDE_TextOut. Change-Id: I63196ebe6c02bc88d1c20ecb625505013edbfa26 Reviewed-on: https://pdfium-review.googlesource.com/22930 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-01-16Move CXFA_ImageRenderer to own fileDan Sinclair
This CL Splits CL_ImageRenderer out of CXFA_FFWidget and moves to a separate file. Methods in CXFA_FFWidget are shuffled around to put the global methods at the top of the file and static methods in the anonymous namespace. Change-Id: I9887a5c9bf9fda63deead7ff785dc4ef3d7e15c8 Reviewed-on: https://pdfium-review.googlesource.com/23031 Reviewed-by: Henrique Nakashima <hnakashima@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-16Move StrokePath to the CXFA_Stroke classDan Sinclair
This CL moves the code to draw the stroke path to the stroke class. Change-Id: I76ae96e15a166d8bae19618c762d5ad923ed8d8a Reviewed-on: https://pdfium-review.googlesource.com/23030 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-16Remove CXFA_Graphics::StretchImage() and related code.Lei Zhang
It is never used. Change-Id: I46c8202cb9e449317fdc1889ff9a610d5ea15d92 Reviewed-on: https://pdfium-review.googlesource.com/22910 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org>
2018-01-16Rename flag to make usage clearerDan Sinclair
The CXFA_FFWidget::DrawBorderWithFlags method only takes one flag to force rounded drawing. This CL renames the int32_t flags to a simple bool to make the usage clear. Change-Id: I4fb552dc77ce76e35225b15d15f2edbb7f5dcf01 Reviewed-on: https://pdfium-review.googlesource.com/23010 Reviewed-by: Ryan Harrison <rharrison@chromium.org> Commit-Queue: dsinclair <dsinclair@chromium.org>
2018-01-16Add WriteBitmapToPng to EmbedderTest.Henrique Nakashima
This is a util method to output the png to a file for visually validating the result of an embedder test. Once validated, the md5 can be considered correct. Bug: pdfium:981 Change-Id: I544dfbf2e85295e6ca2cdf48d1bc3f0bd5f415e9 Reviewed-on: https://pdfium-review.googlesource.com/22990 Reviewed-by: Nicolás Peña Moreno <npm@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
2018-01-16Add FPDF_GetPageBoundingBox API.chromium/3323Henrique Nakashima
This API returns the intersection of the media box and the crop box of a page. Bug: pdfium:973 Change-Id: I57a19ee526ea6d4cd621e1ad6019e51f69f92308 Reviewed-on: https://pdfium-review.googlesource.com/22810 Commit-Queue: Henrique Nakashima <hnakashima@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org>
2018-01-16Add support for XFA specific FormField typesRyan Harrison
This adds to form field types specific types for XFA form fields to be used instead of the generic XFA value when possible. BUG=pdfium:952,chromium:763129,chromium:592758 Change-Id: I8d1cff6a280d71db348b7c31a251cbe2e398ec79 Reviewed-on: https://pdfium-review.googlesource.com/22677 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Ryan Harrison <rharrison@chromium.org>
2018-01-16Add support for pdfium use partitionalloc on loongson platform.Wang Qing
Because system pagesize is 4K on general system, such as x86 etc. But Loongson have 16K system pagesize and unable to print pages with use print preview. Therefore, the relevant pagesize places needs to be changed. Also refer to: https://chromium.googlesource.com/chromium/src/+/0752dbc988222d7edef2ef7c4e19555089c35fdf Bug: 801045 R= palmer@chromium.org Change-Id: Icc5ceae7b8a66be0ced1abb448a80c23fa518f34 Reviewed-on: https://pdfium-review.googlesource.com/22735 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: dsinclair <dsinclair@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
2018-01-16Rename CXFA_Value methods for clarityDan Sinclair
This CL marks the methods in CXFA_Value to make it clear which can return nullptr and updates callsites as needed. Change-Id: If1f794bcbbddaa57a1efdd67195df58a77b4373a Reviewed-on: https://pdfium-review.googlesource.com/22773 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-01-16Rename CXFA_Validate methods for clarityDan Sinclair
This CL updates GetScript to make clearer it can return nullptr. Change-Id: Ic0cf74b3f592dd413ce6fb7a38b29f70487a8dd5 Reviewed-on: https://pdfium-review.googlesource.com/22772 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2018-01-16Rename CXFA_Line methods to make clearerDan Sinclair
This CL clarifies that he CXFA_Line::GetEdge method can return nullptr. Change-Id: I785d4636126727e07a80afb001489bd00ec9ae9e Reviewed-on: https://pdfium-review.googlesource.com/22771 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
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