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#include "Font.h"
#include <AK/kmalloc.h>
#include <AK/BufferStream.h>
#include <AK/StdLibExtras.h>
#include <LibC/unistd.h>
#include <LibC/stdio.h>
#include <LibC/fcntl.h>
#include <LibC/errno.h>
#include <LibC/mman.h>
static Font* s_default_font;
static Font* s_default_bold_font;
struct [[gnu::packed]] FontFileHeader {
char magic[4];
byte glyph_width;
byte glyph_height;
byte type;
byte unused[7];
char name[64];
};
Font& Font::default_font()
{
static const char* default_font_path = "/res/fonts/LizaRegular8x10.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_bold_font()
{
static const char* default_bold_font_path = "/res/fonts/LizaBold8x10.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;
}
RetainPtr<Font> Font::clone() const
{
size_t bytes_per_glyph = sizeof(dword) * 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);
return adopt(*new Font(m_name, new_rows, m_glyph_width, m_glyph_height));
}
Font::Font(const String& name, unsigned* rows, byte glyph_width, byte glyph_height)
: m_name(name)
, m_rows(rows)
, m_glyph_width(glyph_width)
, m_glyph_height(glyph_height)
{
}
Font::~Font()
{
if (m_mmap_ptr) {
int rc = munmap(m_mmap_ptr, 4096 * 3);
ASSERT(rc == 0);
}
}
RetainPtr<Font> Font::load_from_memory(const byte* 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;
}
auto* rows = (unsigned*)(data + sizeof(FontFileHeader));
return adopt(*new Font(String(header.name), rows, header.glyph_width, header.glyph_height));
}
RetainPtr<Font> Font::load_from_file(const String& path)
{
int fd = open(path.characters(), O_RDONLY, 0644);
if (fd < 0) {
dbgprintf("open(%s) got fd=%d, failed: %s\n", path.characters(), fd, strerror(errno));
perror("open");
return nullptr;
}
auto* mapped_file = (byte*)mmap(nullptr, 4096 * 3, PROT_READ, MAP_SHARED, fd, 0);
if (mapped_file == MAP_FAILED) {
int rc = close(fd);
ASSERT(rc == 0);
return nullptr;
}
auto font = load_from_memory(mapped_file);
font->m_mmap_ptr = mapped_file;
int rc = close(fd);
ASSERT(rc == 0);
return font;
}
bool Font::write_to_file(const String& path)
{
int fd = open(path.characters(), O_WRONLY | O_CREAT, 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;
memcpy(header.name, m_name.characters(), min(m_name.length(), (size_t)63));
size_t bytes_per_glyph = sizeof(unsigned) * m_glyph_height;
auto buffer = ByteBuffer::create_uninitialized(sizeof(FontFileHeader) + (256 * bytes_per_glyph));
BufferStream stream(buffer);
stream << ByteBuffer::wrap((byte*)&header, sizeof(FontFileHeader));
stream << ByteBuffer::wrap((byte*)m_rows, (256 * bytes_per_glyph));
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;
}
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