92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
#include "Font.h"
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#define round_up_26_6(val) (((val) + 63) >> 6u)
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static FT_Library ft_library_handle;
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static bool ft_initialized;
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bool Initialize_FreeType()
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{
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if (ft_initialized)
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{
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return true;
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}
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if (FT_Init_FreeType(&ft_library_handle) != 0)
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{
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return false;
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}
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ft_initialized = true;
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return true;
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}
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bool Font::load(const char * fname, int size)
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{
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if (!Initialize_FreeType())
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{
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return false;
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}
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if (FT_New_Face(ft_library_handle, fname, 0, &m_face) != 0)
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{
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return false;
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}
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FT_Set_Pixel_Sizes(m_face, 0, size);
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return preload_glyphs();
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}
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bool Font::preload_glyphs()
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{
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static const char preload_glyph_list[] = "HMgjqxy_|^";
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int max_top = -9999;
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int min_bottom = 9999;
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m_advance = 0;
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for (size_t i = 0u; i < sizeof(preload_glyph_list) - 1u; i++)
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{
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std::shared_ptr<Glyph> g = get_glyph(preload_glyph_list[i]);
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if (g == NULL)
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{
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return false;
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}
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if (m_face->glyph->bitmap_top > max_top)
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{
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max_top = m_face->glyph->bitmap_top;
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}
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int bitmap_bottom = m_face->glyph->bitmap_top - m_face->glyph->bitmap.rows;
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if (bitmap_bottom < min_bottom)
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{
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min_bottom = bitmap_bottom;
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}
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if (g->get_advance() > m_advance)
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{
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m_advance = g->get_advance();
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}
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}
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m_line_height = round_up_26_6(m_face->size->metrics.height);
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m_baseline_offset = (m_line_height - (max_top - min_bottom)) / 2 - min_bottom;
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return true;
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}
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std::shared_ptr<Glyph> Font::get_glyph(FT_ULong character)
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{
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auto it = m_glyphs.find(character);
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if (it != m_glyphs.end())
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{
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return it->second;
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}
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std::shared_ptr<Glyph> glyph = std::make_shared<Glyph>();
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if (!glyph->load(m_face, character))
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{
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glyph = nullptr;
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}
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m_glyphs[character] = glyph;
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return glyph;
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}
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