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#include "bdf_import.hh"
#include "importtools.hh"
#include <sstream>
#include <string>
#include <cctype>
#include <stdexcept>
namespace mcufont {
static std::string toupper(const std::string &input)
{
std::string result;
for (char c: input) result.push_back(::toupper(c));
return result;
}
static int hextoint(char c)
{
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
throw std::domain_error("Hex digit not in range");
}
static void parse_fontinfo(std::istream &file, DataFile::fontinfo_t &fontinfo)
{
std::string line;
while (std::getline(file, line))
{
std::istringstream s(line);
std::string tag;
s >> tag;
tag = toupper(tag);
if (tag == "FONT")
{
while (isspace(s.peek())) s.get();
std::getline(s, fontinfo.name);
}
else if (tag == "FONTBOUNDINGBOX")
{
int x, y;
s >> fontinfo.max_width >> fontinfo.max_height;
s >> x >> y;
fontinfo.baseline_x = - x;
fontinfo.baseline_y = fontinfo.max_height + y;
}
else if (tag == "STARTCHAR")
{
break;
}
}
}
static bool parse_glyph(std::istream &file, DataFile::glyphentry_t &glyph,
const DataFile::fontinfo_t &fontinfo)
{
glyph.chars.clear();
glyph.width = 0;
// Initialize the character contents to all 0 with proper size.
glyph.data.clear();
glyph.data.resize(fontinfo.max_width * fontinfo.max_height, 0);
int bbx_w = fontinfo.max_width;
int bbx_h = fontinfo.max_height;
int bbx_x = - fontinfo.baseline_x;
int bbx_y = fontinfo.baseline_y - fontinfo.max_height;
// Read glyph metadata
std::string line;
std::string tag;
while (std::getline(file, line))
{
std::istringstream s(line);
s >> tag;
tag = toupper(tag);
if (tag == "ENCODING")
{
int c;
s >> c;
glyph.chars.push_back(c);
}
else if (tag == "DWIDTH")
{
s >> glyph.width;
}
else if (tag == "BBX")
{
s >> bbx_w >> bbx_h >> bbx_x >> bbx_y;
}
else if (tag == "BITMAP")
{
break;
}
}
if (tag != "BITMAP")
return false;
// Read glyph bits
int x0 = fontinfo.baseline_x + bbx_x;
int y = fontinfo.baseline_y - bbx_y - bbx_h;
for (int i = 0; i < bbx_h; i++)
{
std::getline(file, line);
line = toupper(line);
for (int x = 0; x < bbx_w; x++)
{
int nibble = hextoint(line.at(x / 4));
uint8_t pixel = 0;
if (nibble & (8 >> (x % 4)))
pixel = 15;
glyph.data.at(y * fontinfo.max_width + x0 + x) = pixel;
}
y++;
}
std::getline(file, line);
line = toupper(line);
if (line.compare(0, 7, "ENDCHAR") == 0)
return true;
else
return false;
}
std::unique_ptr<DataFile> LoadBDF(std::istream &file)
{
DataFile::fontinfo_t fontinfo = {};
std::vector<DataFile::glyphentry_t> glyphtable;
std::vector<DataFile::dictentry_t> dictionary;
parse_fontinfo(file, fontinfo);
while (file)
{
DataFile::glyphentry_t glyph = {};
if (parse_glyph(file, glyph, fontinfo))
glyphtable.push_back(glyph);
}
eliminate_duplicates(glyphtable);
crop_glyphs(glyphtable, fontinfo);
detect_flags(glyphtable, fontinfo);
fontinfo.line_height = fontinfo.max_height;
std::unique_ptr<DataFile> result(new DataFile(
dictionary, glyphtable, fontinfo));
return result;
}
}
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