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Libraries: Move to Userland/Libraries/
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1857 changed files with 266 additions and 274 deletions
140
Userland/Libraries/LibTTF/Font.h
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140
Userland/Libraries/LibTTF/Font.h
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/*
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* Copyright (c) 2020, Srimanta Barua <srimanta.barua1@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/HashMap.h>
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#include <AK/Noncopyable.h>
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#include <AK/RefCounted.h>
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#include <AK/StringView.h>
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Size.h>
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#include <LibTTF/Cmap.h>
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#include <LibTTF/Glyf.h>
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#include <LibTTF/Tables.h>
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#define POINTS_PER_INCH 72.0f
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#define DEFAULT_DPI 96
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namespace TTF {
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struct ScaledFontMetrics {
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int ascender;
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int descender;
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int line_gap;
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int advance_width_max;
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int height() const
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{
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return ascender - descender;
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}
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};
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struct ScaledGlyphMetrics {
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int ascender;
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int descender;
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int advance_width;
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int left_side_bearing;
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};
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class Font : public RefCounted<Font> {
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AK_MAKE_NONCOPYABLE(Font);
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public:
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static RefPtr<Font> load_from_file(const StringView& path, unsigned index = 0);
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static RefPtr<Font> load_from_memory(ByteBuffer&, unsigned index = 0);
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ScaledFontMetrics metrics(float x_scale, float y_scale) const;
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ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;
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RefPtr<Gfx::Bitmap> raster_glyph(u32 glyph_id, float x_scale, float y_scale) const;
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u32 glyph_count() const;
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u16 units_per_em() const;
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u32 glyph_id_for_codepoint(u32 codepoint) const { return m_cmap.glyph_id_for_codepoint(codepoint); }
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private:
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enum class Offsets {
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NumTables = 4,
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TableRecord_Offset = 8,
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TableRecord_Length = 12,
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};
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enum class Sizes {
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TTCHeaderV1 = 12,
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OffsetTable = 12,
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TableRecord = 16,
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};
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static RefPtr<Font> load_from_offset(ByteBuffer&&, unsigned index = 0);
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Font(ByteBuffer&& buffer, Head&& head, Hhea&& hhea, Maxp&& maxp, Hmtx&& hmtx, Cmap&& cmap, Loca&& loca, Glyf&& glyf)
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: m_buffer(move(buffer))
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, m_head(move(head))
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, m_hhea(move(hhea))
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, m_maxp(move(maxp))
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, m_hmtx(move(hmtx))
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, m_loca(move(loca))
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, m_glyf(move(glyf))
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, m_cmap(move(cmap))
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{
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}
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// This owns the font data
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ByteBuffer m_buffer;
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// These are stateful wrappers around non-owning slices
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Head m_head;
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Hhea m_hhea;
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Maxp m_maxp;
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Hmtx m_hmtx;
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Loca m_loca;
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Glyf m_glyf;
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Cmap m_cmap;
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};
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class ScaledFont {
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public:
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ScaledFont(RefPtr<Font> font, float point_width, float point_height, unsigned dpi_x = DEFAULT_DPI, unsigned dpi_y = DEFAULT_DPI)
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: m_font(font)
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{
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float units_per_em = m_font->units_per_em();
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m_x_scale = (point_width * dpi_x) / (POINTS_PER_INCH * units_per_em);
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m_y_scale = (point_height * dpi_y) / (POINTS_PER_INCH * units_per_em);
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}
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u32 glyph_id_for_codepoint(u32 codepoint) const { return m_font->glyph_id_for_codepoint(codepoint); }
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ScaledFontMetrics metrics() const { return m_font->metrics(m_x_scale, m_y_scale); }
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ScaledGlyphMetrics glyph_metrics(u32 glyph_id) const { return m_font->glyph_metrics(glyph_id, m_x_scale, m_y_scale); }
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RefPtr<Gfx::Bitmap> raster_glyph(u32 glyph_id) const;
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u32 glyph_count() const { return m_font->glyph_count(); }
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int width(const StringView&) const;
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int width(const Utf8View&) const;
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int width(const Utf32View&) const;
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private:
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RefPtr<Font> m_font;
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float m_x_scale { 0.0 };
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float m_y_scale { 0.0 };
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mutable AK::HashMap<u32, RefPtr<Gfx::Bitmap>> m_cached_glyph_bitmaps;
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};
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}
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