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LibGfx: Finally render simple TTF outlines.

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This commit is contained in:
Srimanta Barua 2020-06-06 02:06:46 +05:30 • committed by Andreas Kling
parent b70c1fe181
commit 0e9fb803c8
2 changed files with 216 additions and 42 deletions
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85
Libraries/LibGfx/TTFont.h
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@ -29,6 +29,7 @@
#include <AK/ByteBuffer.h>
#include <AK/Noncopyable.h>
#include <AK/OwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/StringView.h>
#include <LibGfx/Size.h>
@ -54,14 +55,40 @@ private:
OwnPtr<u8> m_data;
};
class Font {
class ScaledFont;
struct ScaledFontMetrics {
int ascender;
int descender;
int line_gap;
int advance_width_max;
int height() const
{
return ascender - descender;
}
};
struct ScaledGlyphMetrics {
int ascender;
int descender;
int advance_width;
int left_side_bearing;
};
class Font : public RefCounted<Font> {
AK_MAKE_NONCOPYABLE(Font);
public:
static OwnPtr<Font> load_from_file(const StringView& path, unsigned index);
AABitmap raster_codepoint(u32 codepoint, float x_scale, float y_scale) const;
static RefPtr<Font> load_from_file(const StringView& path, unsigned index);
private:
Font(ByteBuffer&& buffer, u32 offset);
ScaledFontMetrics metrics(float x_scale, float y_scale) const;
ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;
AABitmap raster_glyph(u32 glyph_id, float x_scale, float y_scale) const;
u32 glyph_count() const { return m_maxp.num_glyphs(); }
enum class IndexToLocFormat {
Offset16,
Offset32,
@ -95,6 +122,10 @@ private:
{
ASSERT(m_slice.size() >= 36);
}
i16 ascender() const;
i16 descender() const;
i16 line_gap() const;
u16 advance_width_max() const;
u16 number_of_h_metrics() const;
private:
@ -232,6 +263,24 @@ private:
static Glyph simple(const ByteBuffer& slice, u16 num_contours, i16 xmin, i16 ymin, i16 xmax, i16 ymax);
static Glyph composite(const ByteBuffer& slice); // FIXME: This is currently just a dummy. Need to add support for composite glyphs.
AABitmap raster(float x_scale, float y_scale) const;
int ascender() const
{
if (m_type == Type::Simple) {
return m_meta.simple.ymax;
} else {
// FIXME: Support composite outlines.
ASSERT_NOT_REACHED();
}
}
int descender() const
{
if (m_type == Type::Simple) {
return m_meta.simple.ymin;
} else {
// FIXME: Support composite outlines.
ASSERT_NOT_REACHED();
}
}
private:
enum class Type {
@ -274,8 +323,6 @@ private:
ByteBuffer m_slice;
};
Font(ByteBuffer&& buffer, u32 offset);
ByteBuffer m_buffer;
Head m_head;
Hhea m_hhea;
@ -284,6 +331,34 @@ private:
Cmap m_cmap;
Loca m_loca;
Glyf m_glyf;
friend ScaledFont;
};
class ScaledFont {
public:
ScaledFont(RefPtr<Font> font, float point_width, float point_height, unsigned dpi_x = 96, unsigned dpi_y = 96)
: m_font(font)
{
float units_per_em = m_font->m_head.units_per_em();
m_x_scale = (point_width * dpi_x) / (72.0 * units_per_em);
m_y_scale = (point_height * dpi_y) / (72.0 * units_per_em);
}
u32 glyph_id_for_codepoint(u32 codepoint) const { return m_font->m_cmap.glyph_id_for_codepoint(codepoint); }
ScaledFontMetrics metrics() const { return m_font->metrics(m_x_scale, m_y_scale); }
ScaledGlyphMetrics glyph_metrics(u32 glyph_id) const { return m_font->glyph_metrics(glyph_id, m_x_scale, m_y_scale); }
AABitmap raster_glyph(u32 glyph_id) const { return m_font->raster_glyph(glyph_id, m_x_scale, m_y_scale); }
u32 glyph_count() const { return m_font->glyph_count(); }
int width(const StringView&) const;
int width(const Utf8View&) const;
int width(const Utf32View&) const;
private:
RefPtr<Font> m_font;
float m_x_scale;
float m_y_scale;
friend Font;
};
}