void font::measure(string const &text, rectangle &bounds) const
{
float x = 0.0f;
float y = 0.0f;
if (text.size() == 0)
return;
//y += m_common.base;
for (size_t i = 0; i < text.size(); ++i)
{
char c = text[i];
unsigned char uc = static_cast<unsigned char>(c);
ft_char const &font_char = m_chars_256[uc];
if (font_char.width == 0)
continue;
float a = static_cast<float>(font_char.xadvance);
float w = static_cast<float>(font_char.width);
float h = static_cast<float>(font_char.height);
float ox = static_cast<float>(font_char.xoffset);
float oy = static_cast<float>(font_char.yoffset);
bounds.extend_by(x + ox, y + oy);
bounds.extend_by(x + w + ox, y + oy);
bounds.extend_by(x + w + ox, y + h + oy);
bounds.extend_by(x + ox, y + h + oy);
x += a;
x += m_spacing_delta;
if (i + 1 < text.size() - 1)
{
char next = text[i + 1];
kerning search_key(static_cast<unsigned short>(next));
compare_kerning cmp;
auto j = std::lower_bound(
font_char.kernings.cbegin(),
font_char.kernings.cend(),
search_key,
cmp
);
if (j != font_char.kernings.cend())
{
kerning const &k = *j;
x += static_cast<float>(k.amount);
}
}
}
}
size_t font::print(string const &text, rectangle &bounds, float *&ptr, float x, float y, std::size_t max_chars) const
{
slog_trace("font::print(ptr = %p, text = %s, x = % 7.2, y = % 7.2)",
ptr,
text.c_str(),
x,
y);
if (text.size() == 0)
return 0;
size_t chars_printed = 0;
for (size_t i = 0; i < text.size(); ++i)
{
char c = text[i];
unsigned char uc = static_cast<unsigned char>(c);
ft_char const &font_char = m_chars_256[uc];
float a = static_cast<float>(font_char.xadvance);
if (font_char.width != 0)
{
float w = static_cast<float>(font_char.width);
float h = static_cast<float>(font_char.height);
float ox = static_cast<float>(font_char.xoffset);
float oy = static_cast<float>(font_char.yoffset);
#if 0
glTexCoord2f(font_char.u[0], font_char.v[0]); glVertex2f(x + ox, y + oy);
glTexCoord2f(font_char.u[1], font_char.v[1]); glVertex2f(x + ox + w, y + oy);
glTexCoord2f(font_char.u[2], font_char.v[2]); glVertex2f(x + ox + w, y + oy + h);
glTexCoord2f(font_char.u[0], font_char.v[0]); glVertex2f(x + ox, y + oy);
glTexCoord2f(font_char.u[2], font_char.v[2]); glVertex2f(x + ox + w, y + oy + h);
glTexCoord2f(font_char.u[3], font_char.v[3]); glVertex2f(x + ox, y + oy + h);
#else
*ptr++ = x + ox;
*ptr++ = y + oy;
*ptr++ = font_char.u[0];
*ptr++ = font_char.v[0];
*ptr++ = x + ox + w;
*ptr++ = y + oy;
*ptr++ = font_char.u[1];
*ptr++ = font_char.v[1];
*ptr++ = x + ox + w;
*ptr++ = y + oy + h;
*ptr++ = font_char.u[2];
*ptr++ = font_char.v[2];
*ptr++ = x + ox;
*ptr++ = y + oy + h;
*ptr++ = font_char.u[3];
*ptr++ = font_char.v[3];
#endif
bounds.extend_by(x + ox , y + oy);
bounds.extend_by(x + ox + w, y + oy);
bounds.extend_by(x + ox + w, y + oy + h);
bounds.extend_by(x + ox , y + oy + h);
++chars_printed;
if (chars_printed == max_chars)
break;
}
x += a;
x += m_spacing_delta;
if (i + 1 < text.size())
{
char next = text[i + 1];
kerning search_key(static_cast<unsigned short>(next));
compare_kerning cmp;
vector<kerning>::const_iterator j = std::lower_bound(
font_char.kernings.cbegin(),
font_char.kernings.cend(),
search_key,
cmp
);
if (j != font_char.kernings.cend()) {
kerning const &k = *j;
x += (float)(k.amount);
}
}
}
return chars_printed;
}