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Fonts: added comment about the classic AddFontFromMemoryTTF() issue. (#9067, #6916, #6781, #5330, #4307, #2042, #2029, #1734, #1259, #220)

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ocornut
2025-11-13 15:42:19 +01:00
parent e60e5bff63
commit d246850787
1 changed files with 5 additions and 0 deletions
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5
imgui_draw.cpp
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@@ -3633,6 +3633,11 @@ void ImFontAtlasFontSourceAddToFont(ImFontAtlas* atlas, ImFont* font, ImFontConf
void ImFontAtlasFontDestroySourceData(ImFontAtlas* atlas, ImFontConfig* src)
{
IM_UNUSED(atlas);
// IF YOU GET A CRASH IN THE IM_FREE() CALL HERE AND USED AddFontFromMemoryTTF():
// - DUE TO LEGACY REASON AddFontFromMemoryTTF() TRANSFERS MEMORY OWNERSHIP BY DEFAULT.
// - IT WILL THEREFORE CRASH WHEN PASSED DATA WHICH MAY NOT BE FREEED BY IMGUI.
// - USE `ImFontConfig font_cfg; font_cfg.FontDataOwnedByAtlas = false; io.Fonts->AddFontFromMemoryTTF(....., &cfg);` to disable passing ownership/
// WE WILL ADDRESS THIS IN A FUTURE REWORK OF THE API.
if (src->FontDataOwnedByAtlas)
IM_FREE(src->FontData);
src->FontData = NULL;