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Font: Internals: make used page maps smaller. Since it's extremely rarely used and for iterations only. ~34->16 bytes with ImWchar32.

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ocornut 2025-01-16 22:30:43 +01:00
parent f2262eb81a
commit 487d7f9a29
3 changed files with 13 additions and 13 deletions
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20
imgui_draw.cpp
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@ -3689,7 +3689,7 @@ ImFont::ImFont()
Scale = 1.0f;
Ascent = Descent = 0.0f;
MetricsTotalSurface = 0;
memset(Used4kPagesMap, 0, sizeof(Used4kPagesMap));
memset(Used8kPagesMap, 0, sizeof(Used8kPagesMap));
}
ImFont::~ImFont()
@ -3709,7 +3709,7 @@ void ImFont::ClearOutputData()
DirtyLookupTables = true;
Ascent = Descent = 0.0f;
MetricsTotalSurface = 0;
memset(Used4kPagesMap, 0, sizeof(Used4kPagesMap));
memset(Used8kPagesMap, 0, sizeof(Used8kPagesMap));
}
static ImWchar FindFirstExistingGlyph(ImFont* font, const ImWchar* candidate_chars, int candidate_chars_count)
@ -3732,7 +3732,7 @@ void ImFont::BuildLookupTable()
IndexAdvanceX.clear();
IndexLookup.clear();
DirtyLookupTables = false;
memset(Used4kPagesMap, 0, sizeof(Used4kPagesMap));
memset(Used8kPagesMap, 0, sizeof(Used8kPagesMap));
GrowIndex(max_codepoint + 1);
for (int i = 0; i < Glyphs.Size; i++)
{
@ -3741,8 +3741,8 @@ void ImFont::BuildLookupTable()
IndexLookup[codepoint] = (ImWchar)i;
// Mark 4K page as used
const int page_n = codepoint / 4096;
Used4kPagesMap[page_n >> 3] |= 1 << (page_n & 7);
const int page_n = codepoint / 8192;
Used8kPagesMap[page_n >> 3] |= 1 << (page_n & 7);
}
// Create a glyph to handle TAB
@ -3804,15 +3804,15 @@ void ImFont::BuildLookupTable()
}
}
// API is designed this way to avoid exposing the 4K page size
// API is designed this way to avoid exposing the 8K page size
// e.g. use with IsGlyphRangeUnused(0, 255)
bool ImFont::IsGlyphRangeUnused(unsigned int c_begin, unsigned int c_last)
{
unsigned int page_begin = (c_begin / 4096);
unsigned int page_last = (c_last / 4096);
unsigned int page_begin = (c_begin / 8192);
unsigned int page_last = (c_last / 8192);
for (unsigned int page_n = page_begin; page_n <= page_last; page_n++)
if ((page_n >> 3) < sizeof(Used4kPagesMap))
if (Used4kPagesMap[page_n >> 3] & (1 << (page_n & 7)))
if ((page_n >> 3) < sizeof(Used8kPagesMap))
if (Used8kPagesMap[page_n >> 3] & (1 << (page_n & 7)))
return false;
return true;
}