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ImFont: small optimization to our (incorrect) handling of TAB

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TAB is still handled as 4-spaces width (which is incorrect)
But CalcTextSize is simplified.
This commit is contained in:
ocornut 2015-01-17 22:53:54 +00:00
parent 5ad9a2f119
commit e666920784
1 changed files with 19 additions and 38 deletions
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49
imgui.cpp
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@ -6718,6 +6718,18 @@ void ImFont::BuildLookupTable()
IndexLookup[i] = -1;
for (size_t i = 0; i < Glyphs.size(); i++)
IndexLookup[(int)Glyphs[i].Codepoint] = (int)i;
// Create a glyph to handle TAB
// FIXME: Needs proper TAB handling but it needs to be contextualized (can arbitrary say that each string starts at "column 0"
if (const ImFont::Glyph* space_glyph = FindGlyph((unsigned short)' '))
{
Glyphs.resize(Glyphs.size() + 1);
ImFont::Glyph& tab_glyph = Glyphs.back();
tab_glyph = *space_glyph;
tab_glyph.Codepoint = '\t';
tab_glyph.XAdvance *= 4;
IndexLookup[(int)tab_glyph.Codepoint] = (int)(Glyphs.size()-1);
}
}
const ImFont::Glyph* ImFont::FindGlyph(unsigned short c) const
@ -6930,16 +6942,8 @@ const char* ImFont::CalcWordWrapPositionA(float scale, const char* text, const c
}
float char_width = 0.0f;
if (c == '\t')
{
if (const Glyph* glyph = FindGlyph((unsigned short)' '))
char_width = (glyph->XAdvance * 4) * scale;
}
else
{
if (const Glyph* glyph = FindGlyph((unsigned short)c))
char_width = glyph->XAdvance * scale;
}
if (c == ' ' || c == '\t')
{
@ -7043,16 +7047,8 @@ ImVec2 ImFont::CalcTextSizeA(float size, float max_width, float wrap_width, cons
}
float char_width = 0.0f;
if (c == '\t')
{
// FIXME: Better TAB handling
if (const Glyph* glyph = FindGlyph((unsigned short)' '))
char_width = (glyph->XAdvance * 4) * scale;
}
else if (const Glyph* glyph = FindGlyph((unsigned short)c))
{
if (const Glyph* glyph = FindGlyph((unsigned short)c))
char_width = glyph->XAdvance * scale;
}
if (line_width + char_width >= max_width)
break;
@ -7103,17 +7099,8 @@ ImVec2 ImFont::CalcTextSizeW(float size, float max_width, const ImWchar* text_be
}
float char_width = 0.0f;
if (c == '\t')
{
// FIXME: Better TAB handling
if (const Glyph* glyph = FindGlyph((unsigned short)' '))
char_width = (glyph->XAdvance * 4) * scale;
}
else
{
if (const Glyph* glyph = FindGlyph((unsigned short)c))
char_width = glyph->XAdvance * scale;
}
if (line_width + char_width >= max_width)
break;
@ -7200,16 +7187,10 @@ void ImFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& clip_re
}
float char_width = 0.0f;
if (c == '\t')
{
// FIXME: Better TAB handling
if (const Glyph* glyph = FindGlyph((unsigned short)' '))
char_width += (glyph->XAdvance * 4) * scale;
}
else if (const Glyph* glyph = FindGlyph((unsigned short)c))
if (const Glyph* glyph = FindGlyph((unsigned short)c))
{
char_width = glyph->XAdvance * scale;
if (c != ' ')
if (c != ' ' && c != '\t')
{
// Clipping on Y is more likely
const float y1 = (float)(y + glyph->YOffset * scale);