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ImDrawList::AddPolyline stack overflow on large polylines #5704
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…ck size limitation (ocornut/imgui#5704)
Now that we have access to a shared ImDrawListSharedData instance I think it would be reasonable to turn this into a reused ImVector and use reserve_discard(). I may investigate this. Also note #1811 could still potentially apply but is a separate task. |
Pushed this change f2a522d, no notable change. I even forgot to use reserve_discard() (instead of Note we do not have a policy for freeing that shared buffer, so if you throw a million points at it it won't be freed. We could use a moving-average approximation (without storage) to shrink back |
commit 5884219 Author: cfillion <[email protected]> Date: Wed Sep 28 23:37:39 2022 -0400 imgui_freetype: Assert if bitmap size exceed chunk size to avoid buffer overflow. (ocornut#5731) commit f2a522d Author: ocornut <[email protected]> Date: Fri Sep 30 15:43:27 2022 +0200 ImDrawList: Not using alloca() anymore, lift single polygon size limits. (ocornut#5704, ocornut#1811) commit cc5058e Author: ocornut <[email protected]> Date: Thu Sep 29 21:59:32 2022 +0200 IO: Filter duplicate input events during the AddXXX() calls. (ocornut#5599, ocornut#4921) commit fac8295 Author: ocornut <[email protected]> Date: Thu Sep 29 21:31:36 2022 +0200 IO: remove ImGuiInputEvent::IgnoredAsSame (revert part of 839c310), will filter earlier in next commit. (ocornut#5599) Making it a separate commit as this leads to much indentation change. commit 9e7f460 Author: ocornut <[email protected]> Date: Thu Sep 29 20:42:45 2022 +0200 Fixed GetKeyName() for ImGuiMod_XXX values, made invalid MousePos display in log nicer. (ocornut#4921, ocornut#456) Amend fd408c9 commit 0749453 Author: ocornut <[email protected]> Date: Thu Sep 29 19:51:54 2022 +0200 Menus, Nav: Fixed not being able to close a menu with Left arrow when parent is not a popup. (ocornut#5730) commit 9f6aae3 Author: ocornut <[email protected]> Date: Thu Sep 29 19:48:27 2022 +0200 Nav: Fixed race condition pressing Esc during popup opening frame causing crash. commit bd2355a Author: ocornut <[email protected]> Date: Thu Sep 29 19:25:26 2022 +0200 Menus, Nav: Fixed using left/right navigation when appending to an existing menu (multiple BeginMenu() call with same names). (ocornut#1207) commit 3532ed1 Author: ocornut <[email protected]> Date: Thu Sep 29 18:07:35 2022 +0200 Menus, Nav: Fixed keyboard/gamepad navigation occasionally erroneously landing on menu-item in parent when the parent is not a popup. (ocornut#5730) Replace BeginMenu/MenuItem swapping g.NavWindow with a more adequate ImGuiItemFlags_NoWindowHoverableCheck. Expecting more subtle issues to stem from this. Note that NoWindowHoverableCheck is not supported by IsItemHovered() but then IsItemHovered() on BeginMenu() never worked: fix should be easy in BeginMenu() + add test is IsItemHovered(), will do later commit d5d7050 Author: ocornut <[email protected]> Date: Thu Sep 29 17:26:52 2022 +0200 Various comments As it turns out, functions like IsItemHovered() won't work on an open BeginMenu() because LastItemData is overriden by BeginPopup(). Probably an easy fix. commit e74a50f Author: Andrew D. Zonenberg <[email protected]> Date: Wed Sep 28 08:19:34 2022 -0700 Added GetGlyphRangesGreek() helper for Greek & Coptic glyph range. (ocornut#5676, ocornut#5727) commit d17627b Author: ocornut <[email protected]> Date: Wed Sep 28 17:38:41 2022 +0200 InputText: leave state->Flags uncleared for the purpose of backends emitting an on-screen keyboard for passwords. (ocornut#5724) commit 0a7054c Author: ocornut <[email protected]> Date: Wed Sep 28 17:00:45 2022 +0200 Backends: Win32: Convert WM_CHAR values with MultiByteToWideChar() when window class was registered as MBCS (not Unicode). (ocornut#5725, ocornut#1807, ocornut#471, ocornut#2815, ocornut#1060) commit a229a7f Author: ocornut <[email protected]> Date: Wed Sep 28 16:57:09 2022 +0200 Examples: Win32: Always use RegisterClassW() to ensure windows are Unicode. (ocornut#5725) commit e0330c1 Author: ocornut <[email protected]> Date: Wed Sep 28 14:54:38 2022 +0200 Fonts, Text: Fixed wrapped-text not doing a fast-forward on lines above the clipping region. (ocornut#5720) which would result in an abnormal number of vertices created. commit 4d4889b Author: ocornut <[email protected]> Date: Wed Sep 28 12:42:06 2022 +0200 Refactor CalcWordWrapPositionA() to take on the responsability of minimum character display. Add CalcWordWrapNextLineStartA(), simplify caller code. Should be no-op but incrementing IMGUI_VERSION_NUM just in case. Preparing for ocornut#5720 commit 5c4426c Author: ocornut <[email protected]> Date: Wed Sep 28 12:22:34 2022 +0200 Demo: Fixed Log & Console from losing scrolling position with Auto-Scroll when child is clipped. (ocornut#5721) commit 12c0246 Author: ocornut <[email protected]> Date: Wed Sep 28 12:07:43 2022 +0200 Removed support for 1.42-era IMGUI_DISABLE_INCLUDE_IMCONFIG_H / IMGUI_INCLUDE_IMCONFIG_H. (ocornut#255) commit 73efcec Author: ocornut <[email protected]> Date: Tue Sep 27 22:21:47 2022 +0200 Examples: disable GL related warnings on Mac + amend to ignore list. commit a725db1 Author: ocornut <[email protected]> Date: Tue Sep 27 18:47:20 2022 +0200 Comments for flags discoverability + add to debug log (ocornut#3795, ocornut#4559) commit 325299f Author: ocornut <[email protected]> Date: Wed Sep 14 15:46:27 2022 +0200 Backends: OpenGL: Add ability to #define IMGUI_IMPL_OPENGL_DEBUG. (ocornut#4468, ocornut#4825, ocornut#4832, ocornut#5127, ocornut#5655, ocornut#5709) commit 56c3eae Author: ocornut <[email protected]> Date: Tue Sep 27 14:24:21 2022 +0200 ImDrawList: asserting on incorrect value for CurveTessellationTol (ocornut#5713) commit 04316bd Author: ocornut <[email protected]> Date: Mon Sep 26 16:32:09 2022 +0200 ColorEdit3: fixed id collision leading to an assertion. (ocornut#5707) commit c261dac Author: ocornut <[email protected]> Date: Mon Sep 26 14:50:46 2022 +0200 Demo: moved ShowUserGuide() lower in the file, to make main demo entry point more visible + fix using IMGUI_DEBUG_LOG() macros in if/else. commit 51bbc70 Author: ocornut <[email protected]> Date: Mon Sep 26 14:44:26 2022 +0200 Backends: SDL: Disable SDL 2.0.22 new "auto capture" which prevents drag and drop across windows, and don't capture mouse when drag and dropping. (ocornut#5710) commit 7a9045d Author: ocornut <[email protected]> Date: Mon Sep 26 11:55:07 2022 +0200 Backends: WGPU: removed Emscripten version check (currently failing on CI, ensure why, and tbh its redundant/unnecessary with changes of wgpu api nowadays) commit 83a0030 Author: ocornut <[email protected]> Date: Mon Sep 26 10:33:44 2022 +0200 Added ImGuiMod_Shortcut which is ImGuiMod_Super on Mac and ImGuiMod_Ctrl otherwise. (ocornut#456) commit fd408c9 Author: ocornut <[email protected]> Date: Thu Sep 22 18:58:33 2022 +0200 Renamed and merged keyboard modifiers key enums and flags into a same set:. ImGuiKey_ModXXX -> ImGuiMod_XXX and ImGuiModFlags_XXX -> ImGuiMod_XXX. (ocornut#4921, ocornut#456) Changed signature of GetKeyChordName() to use ImGuiKeyChord. Additionally SetActiveIdUsingAllKeyboardKeys() doesn't set ImGuiKey_ModXXX but we never need/use those and the system will be changed in upcoming commits. # Conflicts: # docs/CHANGELOG.txt # imgui.h # imgui_demo.cpp
The AddPolyline() function uses alloca() for temporary variables even with very large polylines (tens of thousands to millions of segments). This can lead to stack overflows.
This is not a major blocker for my application, which will be using custom shaders for large graphs in the future. I tried to use ImDrawList as a temporary debug visualization and apparently it can't handle it :)
But there should be, at minimum, a better failure mode such as throwing an assertion or falling back to malloc()'d memory. And any hard limits on primitive count should be documented somewhere.
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