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/*
* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/HashMap.h>
#include <AK/Noncopyable.h>
#include <AK/RefCounted.h>
#include <AK/StringView.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Size.h>
#include <LibTTF/Cmap.h>
#include <LibTTF/Glyf.h>
#include <LibTTF/Tables.h>
#define POINTS_PER_INCH 72.0f
#define DEFAULT_DPI 96
namespace TTF {
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 RefPtr<Font> load_from_file(const StringView& path, unsigned index = 0);
static RefPtr<Font> load_from_memory(ByteBuffer&, unsigned index = 0);
ScaledFontMetrics metrics(float x_scale, float y_scale) const;
ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;
RefPtr<Gfx::Bitmap> raster_glyph(u32 glyph_id, float x_scale, float y_scale) const;
u32 glyph_count() const;
u16 units_per_em() const;
u32 glyph_id_for_codepoint(u32 codepoint) const { return m_cmap.glyph_id_for_codepoint(codepoint); }
private:
enum class Offsets {
NumTables = 4,
TableRecord_Offset = 8,
TableRecord_Length = 12,
};
enum class Sizes {
TTCHeaderV1 = 12,
OffsetTable = 12,
TableRecord = 16,
};
static RefPtr<Font> load_from_offset(ByteBuffer&&, unsigned index = 0);
Font(ByteBuffer&& buffer, Head&& head, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf)
: m_buffer(move(buffer))
, m_head(move(head))
, m_hhea(move(hhea))
, m_maxp(move(maxp))
, m_hmtx(move(hmtx))
, m_loca(move(loca))
, m_glyf(move(glyf))
, m_cmap(move(cmap))
{
}
// This owns the font data
ByteBuffer m_buffer;
// These are stateful wrappers around non-owning slices
Head m_head;
Hhea m_hhea;
Maxp m_maxp;
Hmtx m_hmtx;
Loca m_loca;
Glyf m_glyf;
Cmap m_cmap;
};
class ScaledFont {
public:
ScaledFont(RefPtr<Font> font, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI)
: m_font(font)
{
float units_per_em = m_font->units_per_em();
m_x_scale = (point_width * dpi_x) / (POINTS_PER_INCH * units_per_em);
m_y_scale = (point_height * dpi_y) / (POINTS_PER_INCH * units_per_em);
}
u32 glyph_id_for_codepoint(u32 codepoint) const { return m_font->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); }
RefPtr<Gfx::Bitmap> raster_glyph(u32 glyph_id) const;
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 { 0.0 };
float m_y_scale { 0.0 };
mutable AK::HashMap<u32, RefPtr<Gfx::Bitmap>> m_cached_glyph_bitmaps;
};
}
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