LibGfx: Font, extend fonts to 384 character to support LatinExtendedA

2 files changed, 104 insertions, 29 deletions

diff --git a/Libraries/LibGfx/Font.cpp b/Libraries/LibGfx/Font.cpp
index 75488bda3d..1f882bace3 100644
--- a/Libraries/LibGfx/Font.cpp
+++ b/Libraries/LibGfx/Font.cpp
@@ -103,29 +103,31 @@ NonnullRefPtr<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));
+    auto* new_rows = static_cast<unsigned*>(kmalloc(bytes_per_glyph * m_glyph_count));
+    memcpy(new_rows, m_rows, bytes_per_glyph * m_glyph_count);
+    auto* new_widths = static_cast<u8*>(kmalloc(m_glyph_count));
     if (m_glyph_widths)
-        memcpy(new_widths, m_glyph_widths, 256);
+        memcpy(new_widths, m_glyph_widths, m_glyph_count);
     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, m_glyph_spacing));
+        memset(new_widths, m_glyph_width, m_glyph_count);
+    return adopt(*new Font(m_name, new_rows, new_widths, m_fixed_width, m_glyph_width, m_glyph_height, m_glyph_spacing, m_type));
 }
 
-NonnullRefPtr<Font> Font::create(u8 glyph_height, u8 glyph_width, bool fixed)
+NonnullRefPtr<Font> Font::create(u8 glyph_height, u8 glyph_width, bool fixed, FontTypes type)
 {
     size_t bytes_per_glyph = sizeof(u32) * glyph_height;
     // FIXME: This is leaked!
-    auto* new_rows = static_cast<unsigned*>(malloc(bytes_per_glyph * 256));
-    memset(new_rows, 0, bytes_per_glyph * 256);
-    auto* new_widths = static_cast<u8*>(malloc(256));
-    memset(new_widths, glyph_width, 256);
-    return adopt(*new Font("Untitled", new_rows, new_widths, fixed, glyph_width, glyph_height, 1));
+    size_t count = glyph_count_by_type(type);
+    auto* new_rows = static_cast<unsigned*>(malloc(bytes_per_glyph * count));
+    memset(new_rows, 0, bytes_per_glyph * count);
+    auto* new_widths = static_cast<u8*>(malloc(count));
+    memset(new_widths, glyph_width, count);
+    return adopt(*new Font("Untitled", new_rows, new_widths, fixed, glyph_width, glyph_height, 1, type));
 }
 
-Font::Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height, u8 glyph_spacing)
+Font::Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height, u8 glyph_spacing, FontTypes type)
     : m_name(name)
+    , m_type(type)
     , m_rows(rows)
     , m_glyph_widths(widths)
     , m_glyph_width(glyph_width)
@@ -135,10 +137,12 @@ Font::Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_wid
     , m_glyph_spacing(glyph_spacing)
     , m_fixed_width(is_fixed_width)
 {
+    m_glyph_count = glyph_count_by_type(m_type);
+
     if (!m_fixed_width) {
         u8 maximum = 0;
         u8 minimum = 255;
-        for (int i = 0; i < 256; ++i) {
+        for (size_t i = 0; i < m_glyph_count; ++i) {
             minimum = min(minimum, m_glyph_widths[i]);
             maximum = max(maximum, m_glyph_widths[i]);
         }
@@ -163,13 +167,34 @@ RefPtr<Font> Font::load_from_memory(const u8* data)
         return nullptr;
     }
 
+    FontTypes type;
+    if (header.type == 0)
+        type = FontTypes::Default;
+    else if (header.type == 1)
+        type = FontTypes::LatinExtendedA;
+    else
+        ASSERT_NOT_REACHED();
+
+    size_t count = glyph_count_by_type(type);
     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, header.glyph_spacing));
+        widths = (u8*)(rows) + count * bytes_per_glyph;
+    return adopt(*new Font(String(header.name), rows, widths, !header.is_variable_width, header.glyph_width, header.glyph_height, header.glyph_spacing, type));
+}
+
+size_t Font::glyph_count_by_type(FontTypes type)
+{
+    if (type == FontTypes::Default)
+        return 256;
+
+    if (type == FontTypes::LatinExtendedA)
+        return 384;
+
+    dbg() << "Unknown font type:" << type;
+    ASSERT_NOT_REACHED();
 }
 
 RefPtr<Font> Font::load_from_file(const StringView& path)
@@ -199,19 +224,20 @@ bool Font::write_to_file(const StringView& path)
     memcpy(header.magic, "!Fnt", 4);
     header.glyph_width = m_glyph_width;
     header.glyph_height = m_glyph_height;
-    header.type = 0;
+    header.type = m_type;
     header.is_variable_width = !m_fixed_width;
     header.glyph_spacing = m_glyph_spacing;
     memcpy(header.name, m_name.characters(), min(m_name.length(), (size_t)63));
 
     size_t bytes_per_glyph = sizeof(unsigned) * m_glyph_height;
+    size_t count = glyph_count_by_type(m_type);
 
-    auto buffer = ByteBuffer::create_uninitialized(sizeof(FontFileHeader) + (256 * bytes_per_glyph) + 256);
+    auto buffer = ByteBuffer::create_uninitialized(sizeof(FontFileHeader) + (count * bytes_per_glyph) + count);
     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);
+    stream << ByteBuffer::wrap(m_rows, (count * bytes_per_glyph));
+    stream << ByteBuffer::wrap(m_glyph_widths, count);
 
     ASSERT(stream.at_end());
     ssize_t nwritten = write(fd, buffer.data(), buffer.size());
@@ -221,10 +247,15 @@ bool Font::write_to_file(const StringView& path)
     return true;
 }
 
+GlyphBitmap Font::glyph_bitmap(u32 codepoint) const
+{
+    return GlyphBitmap(&m_rows[codepoint * m_glyph_height], { glyph_width(codepoint), m_glyph_height });
+}
+
 int Font::glyph_or_emoji_width(u32 codepoint) const
 {
-    if (codepoint < 256)
-        return glyph_width((char)codepoint);
+    if (codepoint < m_glyph_count)
+        return glyph_width(codepoint);
 
     if (m_fixed_width)
         return m_glyph_width;
@@ -266,4 +297,39 @@ int Font::width(const Utf32View& view) const
     return width;
 }
 
+void Font::set_type(FontTypes type)
+{
+    if (type == m_type)
+        return;
+
+    if (type == FontTypes::Default)
+        return;
+
+    size_t new_glyph_count = glyph_count_by_type(type);
+    if (new_glyph_count <= m_glyph_count) {
+        m_glyph_count = new_glyph_count;
+        return;
+    }
+
+    int item_count_to_copy = min(m_glyph_count, new_glyph_count);
+
+    size_t bytes_per_glyph = sizeof(u32) * glyph_height();
+
+    auto* new_rows = static_cast<unsigned*>(kmalloc(bytes_per_glyph * new_glyph_count));
+    memset(new_rows, (unsigned)0, bytes_per_glyph * new_glyph_count);
+    memcpy(new_rows, m_rows, bytes_per_glyph * item_count_to_copy);
+
+    auto* new_widths = static_cast<u8*>(kmalloc(new_glyph_count));
+    memset(new_widths, (u8)0, new_glyph_count);
+    memcpy(new_widths, m_glyph_widths, item_count_to_copy);
+
+    kfree(m_rows);
+    kfree(m_glyph_widths);
+
+    m_type = type;
+    m_glyph_count = new_glyph_count;
+    m_rows = new_rows;
+    m_glyph_widths = new_widths;
+}
+
 }
diff --git a/Libraries/LibGfx/Font.h b/Libraries/LibGfx/Font.h
index 8bbec4c830..2dae06f4b8 100644
--- a/Libraries/LibGfx/Font.h
+++ b/Libraries/LibGfx/Font.h
@@ -35,6 +35,11 @@
 
 namespace Gfx {
 
+enum FontTypes {
+    Default = 0,
+    LatinExtendedA = 1
+};
+
 // FIXME: Make a MutableGlyphBitmap buddy class for FontEditor instead?
 class GlyphBitmap {
     friend class Font;
@@ -77,16 +82,16 @@ public:
     static Font& default_bold_fixed_width_font();
 
     NonnullRefPtr<Font> clone() const;
-    static NonnullRefPtr<Font> create(u8 glyph_height, u8 glyph_width, bool fixed);
+    static NonnullRefPtr<Font> create(u8 glyph_height, u8 glyph_width, bool fixed, FontTypes type);
 
     static RefPtr<Font> load_from_file(const StringView& path);
     bool write_to_file(const StringView& path);
 
     ~Font();
 
-    GlyphBitmap glyph_bitmap(char ch) const { return GlyphBitmap(&m_rows[(u8)ch * m_glyph_height], { glyph_width(ch), m_glyph_height }); }
+    GlyphBitmap glyph_bitmap(u32 codepoint) const;
 
-    u8 glyph_width(char ch) const { return m_fixed_width ? m_glyph_width : m_glyph_widths[(u8)ch]; }
+    u8 glyph_width(size_t ch) const { return m_fixed_width ? m_glyph_width : m_glyph_widths[ch]; }
     int glyph_or_emoji_width(u32 codepoint) const;
     u8 glyph_height() const { return m_glyph_height; }
     u8 min_glyph_width() const { return m_min_glyph_width; }
@@ -106,20 +111,24 @@ public:
     u8 glyph_spacing() const { return m_glyph_spacing; }
     void set_glyph_spacing(u8 spacing) { m_glyph_spacing = spacing; }
 
-    void set_glyph_width(char ch, u8 width)
+    void set_glyph_width(size_t ch, u8 width)
     {
         ASSERT(m_glyph_widths);
-        m_glyph_widths[(u8)ch] = width;
+        m_glyph_widths[ch] = width;
     }
 
-    int glyph_count() { return m_glyph_count; }
+    int glyph_count() const { return m_glyph_count; }
 
+    FontTypes type() { return m_type; }
+    void set_type(FontTypes type);
 private:
-    Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height, u8 glyph_spacing);
+    Font(const StringView& name, unsigned* rows, u8* widths, bool is_fixed_width, u8 glyph_width, u8 glyph_height, u8 glyph_spacing, FontTypes type);
 
     static RefPtr<Font> load_from_memory(const u8*);
+    static size_t glyph_count_by_type(FontTypes type);
 
     String m_name;
+    FontTypes m_type;
     size_t m_glyph_count { 256 };
 
     unsigned* m_rows { nullptr };