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#include "Font.h"
#include <AK/BufferStream.h>
#include <AK/MappedFile.h>
#include <AK/StdLibExtras.h>
#include <AK/kmalloc.h>
#include <LibC/errno.h>
#include <LibC/fcntl.h>
#include <LibC/mman.h>
#include <LibC/stdio.h>
#include <LibC/unistd.h>
struct [[gnu::packed]] FontFileHeader
{
char magic[4];
u8 glyph_width;
u8 glyph_height;
u8 type;
u8 is_variable_width;
u8 unused[6];
char name[64];
};
Font& Font::default_font()
{
static Font* s_default_font;
static const char* default_font_path = "/res/fonts/Katica10.font";
if (!s_default_font) {
s_default_font = Font::load_from_file(default_font_path).leak_ref();
ASSERT(s_default_font);
}
return *s_default_font;
}
Font& Font::default_fixed_width_font()
{
static Font* s_default_fixed_width_font;
static const char* default_fixed_width_font_path = "/res/fonts/CsillaThin7x10.font";
if (!s_default_fixed_width_font) {
s_default_fixed_width_font = Font::load_from_file(default_fixed_width_font_path).leak_ref();
ASSERT(s_default_fixed_width_font);
}
return *s_default_fixed_width_font;
}
Font& Font::default_bold_font()
{
static Font* s_default_bold_font;
static const char* default_bold_font_path = "/res/fonts/KaticaBold10.font";
if (!s_default_bold_font) {
s_default_bold_font = Font::load_from_file(default_bold_font_path).leak_ref();
ASSERT(s_default_bold_font);
}
return *s_default_bold_font;
}
RefPtr<Font> Font::clone() const
{
size_t bytes_per_glyph = sizeof(u32) * glyph_height();
// FIXME: This is leaked!
auto* new_rows = static_cast<unsigned*>(kmalloc(bytes_per_glyph * 256));
memcpy(new_rows, m_rows, bytes_per_glyph * 256);
auto* new_widths = static_cast<u8*>(kmalloc(256));
if (m_glyph_widths)
memcpy(new_widths, m_glyph_widths, 256);
else
memset(new_widths, m_glyph_width, 256);
return adopt(*new Font(m_name, new_rows, new_widths, m_fixed_width, m_glyph_width, m_glyph_height));
}
Font::Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height)
: m_name(name)
, m_rows(rows)
, m_glyph_widths(widths)
, m_glyph_width(glyph_width)
, m_glyph_height(glyph_height)
, m_min_glyph_width(glyph_width)
, m_max_glyph_width(glyph_width)
, m_fixed_width(is_fixed_width)
{
if (!m_fixed_width) {
u8 maximum = 0;
u8 minimum = 255;
for (int i = 0; i < 256; ++i) {
minimum = min(minimum, m_glyph_widths[i]);
maximum = max(maximum, m_glyph_widths[i]);
}
m_min_glyph_width = minimum;
m_max_glyph_width = maximum;
}
}
Font::~Font()
{
}
RefPtr<Font> Font::load_from_memory(const u8* data)
{
auto& header = *reinterpret_cast<const FontFileHeader*>(data);
if (memcmp(header.magic, "!Fnt", 4)) {
dbgprintf("header.magic != '!Fnt', instead it's '%c%c%c%c'\n", header.magic[0], header.magic[1], header.magic[2], header.magic[3]);
return nullptr;
}
if (header.name[63] != '\0') {
dbgprintf("Font name not fully null-terminated\n");
return nullptr;
}
size_t bytes_per_glyph = sizeof(unsigned) * header.glyph_height;
auto* rows = const_cast<unsigned*>((const unsigned*)(data + sizeof(FontFileHeader)));
u8* widths = nullptr;
if (header.is_variable_width)
widths = (u8*)(rows) + 256 * bytes_per_glyph;
return adopt(*new Font(String(header.name), rows, widths, !header.is_variable_width, header.glyph_width, header.glyph_height));
}
RefPtr<Font> Font::load_from_file(const StringView& path)
{
MappedFile mapped_file(path);
if (!mapped_file.is_valid())
return nullptr;
auto font = load_from_memory((const u8*)mapped_file.pointer());
font->m_mapped_file = move(mapped_file);
return font;
}
bool Font::write_to_file(const StringView& path)
{
int fd = creat(String(path).characters(), 0644);
if (fd < 0) {
perror("open");
return false;
}
FontFileHeader header;
memset(&header, 0, sizeof(FontFileHeader));
memcpy(header.magic, "!Fnt", 4);
header.glyph_width = m_glyph_width;
header.glyph_height = m_glyph_height;
header.type = 0;
header.is_variable_width = !m_fixed_width;
memcpy(header.name, m_name.characters(), min(m_name.length(), 63));
size_t bytes_per_glyph = sizeof(unsigned) * m_glyph_height;
auto buffer = ByteBuffer::create_uninitialized(sizeof(FontFileHeader) + (256 * bytes_per_glyph) + 256);
BufferStream stream(buffer);
stream << ByteBuffer::wrap(&header, sizeof(FontFileHeader));
stream << ByteBuffer::wrap(m_rows, (256 * bytes_per_glyph));
stream << ByteBuffer::wrap(m_glyph_widths, 256);
ASSERT(stream.at_end());
ssize_t nwritten = write(fd, buffer.pointer(), buffer.size());
ASSERT(nwritten == (ssize_t)buffer.size());
int rc = close(fd);
ASSERT(rc == 0);
return true;
}
int Font::width(const StringView& string) const
{
if (!string.length())
return 0;
if (m_fixed_width)
return string.length() * m_glyph_width;
int width = 0;
for (int i = 0; i < string.length(); ++i)
width += glyph_width(string.characters_without_null_termination()[i]) + 1;
return width - 1;
}
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