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Fonts: Fixed crash when manually specifying an EllipsisChar that doesn't exist. (#6480)

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This commit is contained in:
ocornut 2023-05-31 14:44:29 +02:00
parent b476184574
commit 075b975fed
2 changed files with 20 additions and 20 deletions
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1
docs/CHANGELOG.txt
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@ -73,6 +73,7 @@ Other changes:
- Menus: Fixed an issue when opening a menu hierarchy in a given menu-bar would allow
opening another via simple hovering. (#3496, #4797)
- Fonts: Fixed crash when merging fonts and the first font has no valid glyph. (#6446) [@JaedanC]
- Fonts: Fixed crash when manually specifying an EllipsisChar that doesn't exist. (#6480)
- Misc: Added ImVec2 unary minus operator. (#6368) [@Koostosh]
- Debug Tools: Debug Log: Fixed not parsing 0xXXXXXXXX values for geo-locating on mouse
hover hover when the identifier is at the end of the line. (#5855)

39
imgui_draw.cpp
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@ -3200,7 +3200,25 @@ void ImFont::BuildLookupTable()
SetGlyphVisible((ImWchar)' ', false);
SetGlyphVisible((ImWchar)'\t', false);
// Ellipsis character is required for rendering elided text. We prefer using U+2026 (horizontal ellipsis).
// Setup Fallback character
const ImWchar fallback_chars[] = { (ImWchar)IM_UNICODE_CODEPOINT_INVALID, (ImWchar)'?', (ImWchar)' ' };
FallbackGlyph = FindGlyphNoFallback(FallbackChar);
if (FallbackGlyph == NULL)
{
FallbackChar = FindFirstExistingGlyph(this, fallback_chars, IM_ARRAYSIZE(fallback_chars));
FallbackGlyph = FindGlyphNoFallback(FallbackChar);
if (FallbackGlyph == NULL)
{
FallbackGlyph = &Glyphs.back();
FallbackChar = (ImWchar)FallbackGlyph->Codepoint;
}
}
FallbackAdvanceX = FallbackGlyph->AdvanceX;
for (int i = 0; i < max_codepoint + 1; i++)
if (IndexAdvanceX[i] < 0.0f)
IndexAdvanceX[i] = FallbackAdvanceX;
// Setup Ellipsis character. It is required for rendering elided text. We prefer using U+2026 (horizontal ellipsis).
// However some old fonts may contain ellipsis at U+0085. Here we auto-detect most suitable ellipsis character.
// FIXME: Note that 0x2026 is rarely included in our font ranges. Because of this we are more likely to use three individual dots.
const ImWchar ellipsis_chars[] = { (ImWchar)0x2026, (ImWchar)0x0085 };
@ -3221,25 +3239,6 @@ void ImFont::BuildLookupTable()
EllipsisCharStep = (glyph->X1 - glyph->X0) + 1.0f;
EllipsisWidth = EllipsisCharStep * 3.0f - 1.0f;
}
// Setup fallback character
const ImWchar fallback_chars[] = { (ImWchar)IM_UNICODE_CODEPOINT_INVALID, (ImWchar)'?', (ImWchar)' ' };
FallbackGlyph = FindGlyphNoFallback(FallbackChar);
if (FallbackGlyph == NULL)
{
FallbackChar = FindFirstExistingGlyph(this, fallback_chars, IM_ARRAYSIZE(fallback_chars));
FallbackGlyph = FindGlyphNoFallback(FallbackChar);
if (FallbackGlyph == NULL)
{
FallbackGlyph = &Glyphs.back();
FallbackChar = (ImWchar)FallbackGlyph->Codepoint;
}
}
FallbackAdvanceX = FallbackGlyph->AdvanceX;
for (int i = 0; i < max_codepoint + 1; i++)
if (IndexAdvanceX[i] < 0.0f)
IndexAdvanceX[i] = FallbackAdvanceX;
}
// API is designed this way to avoid exposing the 4K page size