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ImFontConfig: Added GlyphMinAdvanceX/GlyphMaxAdvanceX settings useful to make a font appears monospaced, particularly useful for icon fonts. (#1869)

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omar
2018-06-08 12:46:36 +02:00
parent 8e48ab6b19
commit f5bf9f509c
5 changed files with 31 additions and 12 deletions
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21
misc/freetype/imgui_freetype.cpp
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@ -9,6 +9,7 @@
// - v0.53: (2017/10/22) minor inconsequential change to match change in master (removed an unnecessary statement)
// - v0.54: (2018/01/22) fix for addition of ImFontAtlas::TexUvscale member
// - v0.55: (2018/02/04) moved to main imgui repository (away from http://www.github.com/ocornut/imgui_club)
// - v0.56: (2018/06/08) added support for ImFontConfig::GlyphMinAdvanceX, GlyphMaxAdvanceX
// Gamma Correct Blending:
// FreeType assumes blending in linear space rather than gamma space.
@ -324,8 +325,8 @@ bool ImGuiFreeType::BuildFontAtlas(ImFontAtlas* atlas, unsigned int extra_flags)
const float ascent = font_face.Info.Ascender;
const float descent = font_face.Info.Descender;
ImFontAtlasBuildSetupFont(atlas, dst_font, &cfg, ascent, descent);
const float off_x = cfg.GlyphOffset.x;
const float off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);
const float font_off_x = cfg.GlyphOffset.x;
const float font_off_y = cfg.GlyphOffset.y + (float)(int)(dst_font->Ascent + 0.5f);
bool multiply_enabled = (cfg.RasterizerMultiply != 1.0f);
unsigned char multiply_table[256];
@ -356,17 +357,23 @@ bool ImGuiFreeType::BuildFontAtlas(ImFontAtlas* atlas, unsigned int extra_flags)
font_face.BlitGlyph(ft_glyph_bitmap, blit_dst, atlas->TexWidth, multiply_enabled ? multiply_table : NULL);
FT_Done_Glyph(ft_glyph);
float char_advance_x_org = glyph_info.AdvanceX;
float char_advance_x_mod = ImClamp(char_advance_x_org, cfg.GlyphMinAdvanceX, cfg.GlyphMaxAdvanceX);
float char_off_x = font_off_x;
if (char_advance_x_org != char_advance_x_mod)
char_off_x += cfg.PixelSnapH ? (float)(int)((char_advance_x_mod - char_advance_x_org) * 0.5f) : (char_advance_x_mod - char_advance_x_org) * 0.5f;
// Register glyph
dst_font->AddGlyph((ImWchar)codepoint,
glyph_info.OffsetX + off_x,
glyph_info.OffsetY + off_y,
glyph_info.OffsetX + off_x + glyph_info.Width,
glyph_info.OffsetY + off_y + glyph_info.Height,
glyph_info.OffsetX + char_off_x,
glyph_info.OffsetY + font_off_y,
glyph_info.OffsetX + char_off_x + glyph_info.Width,
glyph_info.OffsetY + font_off_y + glyph_info.Height,
rect.x / (float)atlas->TexWidth,
rect.y / (float)atlas->TexHeight,
(rect.x + glyph_info.Width) / (float)atlas->TexWidth,
(rect.y + glyph_info.Height) / (float)atlas->TexHeight,
glyph_info.AdvanceX);
char_advance_x_mod);
}
}
}