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ImFontGlyphRangesBuilder: Fixed unnecessarily over-sized buffer, which incidentally was also not fully cleared. Fixed edge case overflow when adding character 0xFFFF. (#2568)

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This commit is contained in:
omar 2019-05-21 12:45:27 +02:00
parent 882d2c3aea
commit 34b881eb12
3 changed files with 11 additions and 7 deletions
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2
docs/CHANGELOG.txt
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@ -50,6 +50,8 @@ Other Changes:
- Scrollbar: Very minor bounding box adjustment to cope with various border size.
- ImFontAtlas: FreeType: Added RasterizerFlags::Monochrome flag to disable font anti-aliasing. (#2545)
Combine with RasterizerFlags::MonoHinting for best results.
- ImFontGlyphRangesBuilder: Fixed unnecessarily over-sized buffer, which incidentally was also not
fully cleared. Fixed edge case overflow when adding character 0xFFFF. (#2568). [@NIKE3500]
- Add native Mac clipboard copy/paste default implementation in core library to match what we are
dealing with Win32, and to facilitate integration in custom engines. (#2546) [@andrewwillmott]
- Examples/Backends: Don't filter characters under 0x10000 before calling io.AddInputCharacter(),

11
imgui.h
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@ -1997,12 +1997,13 @@ struct ImFontGlyph
// This is essentially a tightly packed of vector of 64k booleans = 8KB storage.
struct ImFontGlyphRangesBuilder
{
ImVector<int> UsedChars; // Store 1-bit per Unicode code point (0=unused, 1=used)
ImVector<ImU32> UsedChars; // Store 1-bit per Unicode code point (0=unused, 1=used)
ImFontGlyphRangesBuilder() { UsedChars.resize(0x10000 / sizeof(int)); memset(UsedChars.Data, 0, 0x10000 / sizeof(int)); }
bool GetBit(int n) const { int off = (n >> 5); int mask = 1 << (n & 31); return (UsedChars[off] & mask) != 0; } // Get bit n in the array
void SetBit(int n) { int off = (n >> 5); int mask = 1 << (n & 31); UsedChars[off] |= mask; } // Set bit n in the array
void AddChar(ImWchar c) { SetBit(c); } // Add character
ImFontGlyphRangesBuilder() { Clear(); }
inline void Clear() { int size_in_bytes = 0x10000 / 8; UsedChars.resize(size_in_bytes / (int)sizeof(ImU32)); memset(UsedChars.Data, 0, (size_t)size_in_bytes); }
inline bool GetBit(int n) const { int off = (n >> 5); ImU32 mask = 1u << (n & 31); return (UsedChars[off] & mask) != 0; } // Get bit n in the array
inline void SetBit(int n) { int off = (n >> 5); ImU32 mask = 1u << (n & 31); UsedChars[off] |= mask; } // Set bit n in the array
inline void AddChar(ImWchar c) { SetBit(c); } // Add character
IMGUI_API void AddText(const char* text, const char* text_end = NULL); // Add string (each character of the UTF-8 string are added)
IMGUI_API void AddRanges(const ImWchar* ranges); // Add ranges, e.g. builder.AddRanges(ImFontAtlas::GetGlyphRangesDefault()) to force add all of ASCII/Latin+Ext
IMGUI_API void BuildRanges(ImVector<ImWchar>* out_ranges); // Output new ranges

5
imgui_draw.cpp
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@ -2391,11 +2391,12 @@ void ImFontGlyphRangesBuilder::AddRanges(const ImWchar* ranges)
void ImFontGlyphRangesBuilder::BuildRanges(ImVector<ImWchar>* out_ranges)
{
for (int n = 0; n < 0x10000; n++)
int max_codepoint = 0x10000;
for (int n = 0; n < max_codepoint; n++)
if (GetBit(n))
{
out_ranges->push_back((ImWchar)n);
while (n < 0x10000 && GetBit(n + 1))
while (n < max_codepoint - 1 && GetBit(n + 1))
n++;
out_ranges->push_back((ImWchar)n);
}