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// Copyright (c) 2010-2026, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-443271.
//
// This file is part of the GLVis visualization tool and library. For more
// information and source code availability see https://glvis.org.
//
// GLVis is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
#include <vector>
#include "font.hpp"
#include "aux_vis.hpp"
using std::cout;
using std::endl;
struct vert_tex2d
{
float x, y;
float u, v;
vert_tex2d(float x, float y, float u, float v)
: x(x), y(y), u(u), v(v) { }
};
const int font_scale = 64;
bool GlVisFont::LoadFont(const std::string& path, int font_index, int font_size)
{
if (!init)
{
return false;
}
if (font_init)
{
glDeleteTextures(1, &font_tex);
FT_Done_Face(face);
font_init = false;
}
if (FT_New_Face(library, path.c_str(), font_index, &face))
{
cout << "GlVisFont::LoadFont(): Cannot open font file: " << path << endl;
return false;
}
face_has_kerning = FT_HAS_KERNING(face);
int ppi_w, ppi_h;
GetAppWindow()->getDpi(ppi_w, ppi_h);
const bool use_fixed_ppi_h = true;
if (use_fixed_ppi_h)
{
double ratio = double(ppi_w)/ppi_h;
ppi_h = GetAppWindow()->isHighDpi() ? 192 : 96;
ppi_w = ratio*ppi_h + 0.5;
#ifdef GLVIS_DEBUG
cout << "Fonts use fixed ppi: " << ppi_w << " x " << ppi_h << endl;
#endif
}
if (FT_Set_Char_Size(face, 0, font_size*font_scale, ppi_w, ppi_h))
{
cout << "GlVisFont::LoadFont(): Cannot set font height: " << font_size
<< " pts" << endl;
FT_Done_Face(face);
return false;
}
#ifdef GLVIS_DEBUG
cout << "Loaded font: " << path << ", index: " << font_index
<< ", height: " << font_size << endl;
#endif
// generate atlas
size_t w = 0, h = 0;
for (int c = 32; c < 128; c++)
{
if (FT_Load_Char(face, c, FT_LOAD_RENDER))
{
cout << "GlVisFont::LoadFont(): Cannot load glyph: " << (char) c << endl;
continue;
}
w += face->glyph->bitmap.width + 2;
if (h < size_t(face->glyph->bitmap.rows))
{
h = face->glyph->bitmap.rows;
}
}
tex_w = w;
tex_h = h + 2;
#ifdef GLVIS_DEBUG
cout << "GlVisFont::LoadFont(): font texture dimensions are ("
<< tex_w << ", " << tex_h << ")" << endl;
#endif
glGenTextures(1, &font_tex);
glActiveTexture(GL_TEXTURE0 + 1);
glBindTexture(GL_TEXTURE_2D, font_tex);
std::vector<uint8_t> zeros(tex_w * tex_h, 0);
GLenum alpha_internal_fmt = alpha_channel == GL_RED ? GL_R8 : GL_ALPHA;
glTexImage2D(GL_TEXTURE_2D, 0, alpha_internal_fmt, tex_w, tex_h, 0,
alpha_channel,
GL_UNSIGNED_BYTE, zeros.data());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
int x = 0;
for (int c = 32; c < 128; c++)
{
if (FT_Load_Char(face, c, FT_LOAD_RENDER))
{
cout << "GlVisFont::LoadFont(): Cannot load glyph: " << (char) c << endl;
continue;
}
FT_GlyphSlot glyph_slot = face->glyph;
glTexSubImage2D(GL_TEXTURE_2D,
0,
x + 1, 1,
glyph_slot->bitmap.width,
glyph_slot->bitmap.rows,
alpha_channel,
GL_UNSIGNED_BYTE,
glyph_slot->bitmap.buffer);
// To improve the rendering quality in some cases, we can utilize the
// 'lsb_delta' and 'rsb_delta' fields in 'glyph_slot'. These will need to
// be stored in the GlVisFont::glyph struct and used in the method
// bufferToDevice() of class CoreGLDevice and class FFGLDevice.
font_chars[c] =
{
(unsigned)(glyph_slot->bitmap.width + 2),
(unsigned)(glyph_slot->bitmap.rows + 2),
glyph_slot->bitmap_left,
glyph_slot->bitmap_top,
glyph_slot->advance.x / 64.f,
glyph_slot->advance.y / 64.f,
x / (float) w
};
x += glyph_slot->bitmap.width + 2;
}
font_init = true;
// glEnable(GL_TEXTURE_2D);
glActiveTexture(GL_TEXTURE0);
return true;
}
void GlVisFont::getObjectSize(const std::string& text, int& w, int& h)
{
float pen_x = 0.f, pen_y = 0.f;
char prev_c = '\0';
int min_x = INT_MAX, max_x = INT_MIN;
int min_y = INT_MAX, max_y = INT_MIN;
for (char c : text)
{
const glyph &g = GetTexChar(c);
if (!g.w || !g.h) { continue; }
pen_x += GetKerning(prev_c, c);
// note: both g.w and g.h include padding of 2
// note: the x-direction bounds are not pixel-tight (include bear_x/adv_x)
// note: the y-direction bounds are pixel-tight
min_x = std::min(min_x, (int)floorf(pen_x));
max_x = std::max(max_x, (int)ceilf (pen_x + g.adv_x));
min_y = std::min(min_y, (int)floorf(pen_y + g.bear_y - (g.h - 2)));
max_y = std::max(max_y, (int)ceilf (pen_y + g.bear_y));
pen_x += g.adv_x;
pen_y += g.adv_y;
prev_c = c;
}
w = max_x - min_x;
h = max_y - min_y;
}
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