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#include "Font.h"
#include <AK/kmalloc.h>
#include <AK/BufferStream.h>
#include <AK/StdLibExtras.h>
#ifdef KERNEL
#include <Kernel/FileDescriptor.h>
#include <Kernel/VirtualFileSystem.h>
#endif
#ifdef USERLAND
#include <LibC/unistd.h>
#include <LibC/stdio.h>
#include <LibC/fcntl.h>
#include <LibC/errno.h>
#include <LibC/mman.h>
#endif
static const byte error_glyph_width = 8;
static const byte error_glyph_height = 10;
static constexpr const char* error_glyph {
" #### "
" # # "
" # # "
" # ## # "
" # ## # "
" #### "
" ## "
" ###### "
" ## "
" ## ",
};
static Font* s_default_font;
static Font* s_default_bold_font;
void Font::initialize()
{
s_default_font = nullptr;
s_default_bold_font = nullptr;
}
Font& Font::default_font()
{
static const char* default_font_path = "/res/fonts/Liza8x10.font";
if (!s_default_font) {
#ifdef USERLAND
s_default_font = Font::load_from_file(default_font_path).leak_ref();
#else
int error;
auto descriptor = VFS::the().open(default_font_path, error, 0, 0, *VFS::the().root_inode());
if (!descriptor) {
kprintf("Failed to open default font (%s)\n", default_font_path);
ASSERT_NOT_REACHED();
}
auto buffer = descriptor->read_entire_file(*current);
ASSERT(buffer);
s_default_font = Font::load_from_memory(buffer.pointer()).leak_ref();
#endif
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) {
#ifdef USERLAND
s_default_bold_font = Font::load_from_file(default_bold_font_path).leak_ref();
#else
int error;
auto descriptor = VFS::the().open(default_bold_font_path, error, 0, 0, *VFS::the().root_inode());
if (!descriptor) {
kprintf("Failed to open default font (%s)\n", default_bold_font_path);
ASSERT_NOT_REACHED();
}
auto buffer = descriptor->read_entire_file(*current);
ASSERT(buffer);
s_default_bold_font = Font::load_from_memory(buffer.pointer()).leak_ref();
#endif
ASSERT(s_default_bold_font);
}
return *s_default_bold_font;
}
RetainPtr<Font> Font::clone() const
{
size_t bytes_per_glyph = glyph_width() * glyph_height();
// FIXME: This is leaked!
char** new_glyphs = static_cast<char**>(kmalloc(sizeof(char*) * 256));
for (unsigned i = 0; i < 256; ++i) {
new_glyphs[i] = static_cast<char*>(kmalloc(bytes_per_glyph));
if (i >= m_first_glyph && i <= m_last_glyph) {
memcpy(new_glyphs[i], m_glyphs[i - m_first_glyph], bytes_per_glyph);
} else {
memset(new_glyphs[i], ' ', bytes_per_glyph);
}
}
return adopt(*new Font(m_name, new_glyphs, m_glyph_width, m_glyph_height, 0, 255));
}
Font::Font(const String& name, const char* const* glyphs, byte glyph_width, byte glyph_height, byte first_glyph, byte last_glyph)
: m_name(name)
, m_glyphs(glyphs)
, m_glyph_width(glyph_width)
, m_glyph_height(glyph_height)
, m_first_glyph(first_glyph)
, m_last_glyph(last_glyph)
{
ASSERT(m_glyph_width == error_glyph_width);
ASSERT(m_glyph_height == error_glyph_height);
m_error_bitmap = CharacterBitmap::create_from_ascii(error_glyph, error_glyph_width, error_glyph_height);
for (unsigned ch = 0; ch < 256; ++ch) {
if (ch < m_first_glyph || ch > m_last_glyph) {
m_bitmaps[ch] = m_error_bitmap.copy_ref();
continue;
}
const char* data = m_glyphs[(unsigned)ch - m_first_glyph];
m_bitmaps[ch] = CharacterBitmap::create_from_ascii(data, m_glyph_width, m_glyph_height);
}
}
Font::~Font()
{
}
struct FontFileHeader {
char magic[4];
byte glyph_width;
byte glyph_height;
byte type;
byte unused[7];
char name[64];
} PACKED;
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* glyphs_ptr = reinterpret_cast<const unsigned*>(data + sizeof(FontFileHeader));
char** new_glyphs = static_cast<char**>(kmalloc(sizeof(char*) * 256));
for (unsigned glyph_index = 0; glyph_index < 256; ++glyph_index) {
new_glyphs[glyph_index] = static_cast<char*>(kmalloc(header.glyph_width * header.glyph_height));
char* bitptr = new_glyphs[glyph_index];
for (unsigned y = 0; y < header.glyph_height; ++y) {
unsigned pattern = *(glyphs_ptr++);
for (unsigned x = 0; x < header.glyph_width; ++x) {
if (pattern & (1u << x)) {
*(bitptr++) = '#';
} else {
*(bitptr++) = ' ';
}
}
}
}
return adopt(*new Font(String(header.name), new_glyphs, header.glyph_width, header.glyph_height, 0, 255));
}
#ifdef USERLAND
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);
int rc = munmap(mapped_file, 4096 * 3);
ASSERT(rc == 0);
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(), 63u));
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));
for (unsigned glyph_index = 0; glyph_index < 256; ++glyph_index) {
auto* glyph_bits = (byte*)m_glyphs[glyph_index];
for (unsigned y = 0; y < m_glyph_height; ++y) {
unsigned pattern = 0;
for (unsigned x = 0; x < m_glyph_width; ++x) {
if (glyph_bits[y * m_glyph_width + x] == '#') {
pattern |= 1 << x;
}
}
stream << pattern;
}
}
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;
}
#endif
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