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c110cf193d
Instead of computing the path length inside the syscall handler, let the caller do that work. This allows us to implement to new variants of open() and creat(), called open_with_path_length() and creat_with_path_length(). These are suitable for use with e.g StringView.
175 lines
5.3 KiB
C++
175 lines
5.3 KiB
C++
#include "Font.h"
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#include <AK/BufferStream.h>
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#include <AK/MappedFile.h>
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#include <AK/StdLibExtras.h>
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#include <AK/kmalloc.h>
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#include <LibC/errno.h>
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#include <LibC/fcntl.h>
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#include <LibC/mman.h>
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#include <LibC/stdio.h>
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#include <LibC/unistd.h>
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struct [[gnu::packed]] FontFileHeader
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{
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char magic[4];
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u8 glyph_width;
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u8 glyph_height;
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u8 type;
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u8 is_variable_width;
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u8 unused[6];
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char name[64];
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};
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Font& Font::default_font()
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{
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static Font* s_default_font;
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static const char* default_font_path = "/res/fonts/Katica10.font";
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if (!s_default_font) {
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s_default_font = Font::load_from_file(default_font_path).leak_ref();
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ASSERT(s_default_font);
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}
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return *s_default_font;
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}
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Font& Font::default_fixed_width_font()
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{
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static Font* s_default_fixed_width_font;
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static const char* default_fixed_width_font_path = "/res/fonts/CsillaThin7x10.font";
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if (!s_default_fixed_width_font) {
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s_default_fixed_width_font = Font::load_from_file(default_fixed_width_font_path).leak_ref();
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ASSERT(s_default_fixed_width_font);
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}
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return *s_default_fixed_width_font;
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}
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Font& Font::default_bold_font()
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{
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static Font* s_default_bold_font;
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static const char* default_bold_font_path = "/res/fonts/KaticaBold10.font";
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if (!s_default_bold_font) {
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s_default_bold_font = Font::load_from_file(default_bold_font_path).leak_ref();
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ASSERT(s_default_bold_font);
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}
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return *s_default_bold_font;
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}
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RefPtr<Font> Font::clone() const
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{
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size_t bytes_per_glyph = sizeof(u32) * glyph_height();
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// FIXME: This is leaked!
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auto* new_rows = static_cast<unsigned*>(kmalloc(bytes_per_glyph * 256));
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memcpy(new_rows, m_rows, bytes_per_glyph * 256);
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auto* new_widths = static_cast<u8*>(kmalloc(256));
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if (m_glyph_widths)
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memcpy(new_widths, m_glyph_widths, 256);
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else
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memset(new_widths, m_glyph_width, 256);
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return adopt(*new Font(m_name, new_rows, new_widths, m_fixed_width, m_glyph_width, m_glyph_height));
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}
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Font::Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height)
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: m_name(name)
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, m_rows(rows)
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, m_glyph_widths(widths)
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, m_glyph_width(glyph_width)
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, m_glyph_height(glyph_height)
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, m_min_glyph_width(glyph_width)
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, m_max_glyph_width(glyph_width)
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, m_fixed_width(is_fixed_width)
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{
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if (!m_fixed_width) {
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u8 maximum = 0;
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u8 minimum = 255;
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for (int i = 0; i < 256; ++i) {
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minimum = min(minimum, m_glyph_widths[i]);
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maximum = max(maximum, m_glyph_widths[i]);
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}
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m_min_glyph_width = minimum;
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m_max_glyph_width = maximum;
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}
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}
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Font::~Font()
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{
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}
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RefPtr<Font> Font::load_from_memory(const u8* data)
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{
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auto& header = *reinterpret_cast<const FontFileHeader*>(data);
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if (memcmp(header.magic, "!Fnt", 4)) {
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dbgprintf("header.magic != '!Fnt', instead it's '%c%c%c%c'\n", header.magic[0], header.magic[1], header.magic[2], header.magic[3]);
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return nullptr;
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}
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if (header.name[63] != '\0') {
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dbgprintf("Font name not fully null-terminated\n");
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return nullptr;
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}
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size_t bytes_per_glyph = sizeof(unsigned) * header.glyph_height;
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auto* rows = const_cast<unsigned*>((const unsigned*)(data + sizeof(FontFileHeader)));
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u8* widths = nullptr;
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if (header.is_variable_width)
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widths = (u8*)(rows) + 256 * bytes_per_glyph;
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return adopt(*new Font(String(header.name), rows, widths, !header.is_variable_width, header.glyph_width, header.glyph_height));
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}
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RefPtr<Font> Font::load_from_file(const StringView& path)
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{
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MappedFile mapped_file(path);
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if (!mapped_file.is_valid())
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return nullptr;
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auto font = load_from_memory((const u8*)mapped_file.pointer());
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font->m_mapped_file = move(mapped_file);
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return font;
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}
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bool Font::write_to_file(const StringView& path)
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{
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int fd = creat_with_path_length(path.characters_without_null_termination(), path.length(), 0644);
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if (fd < 0) {
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perror("open");
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return false;
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}
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FontFileHeader header;
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memset(&header, 0, sizeof(FontFileHeader));
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memcpy(header.magic, "!Fnt", 4);
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header.glyph_width = m_glyph_width;
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header.glyph_height = m_glyph_height;
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header.type = 0;
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header.is_variable_width = !m_fixed_width;
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memcpy(header.name, m_name.characters(), min(m_name.length(), 63));
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size_t bytes_per_glyph = sizeof(unsigned) * m_glyph_height;
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auto buffer = ByteBuffer::create_uninitialized(sizeof(FontFileHeader) + (256 * bytes_per_glyph) + 256);
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BufferStream stream(buffer);
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stream << ByteBuffer::wrap(&header, sizeof(FontFileHeader));
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stream << ByteBuffer::wrap(m_rows, (256 * bytes_per_glyph));
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stream << ByteBuffer::wrap(m_glyph_widths, 256);
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ASSERT(stream.at_end());
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ssize_t nwritten = write(fd, buffer.pointer(), buffer.size());
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ASSERT(nwritten == (ssize_t)buffer.size());
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int rc = close(fd);
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ASSERT(rc == 0);
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return true;
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}
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int Font::width(const StringView& string) const
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{
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if (!string.length())
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return 0;
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if (m_fixed_width)
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return string.length() * m_glyph_width;
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int width = 0;
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for (int i = 0; i < string.length(); ++i)
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width += glyph_width(string.characters_without_null_termination()[i]) + 1;
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return width - 1;
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}
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