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LibGfx: Started working on TTF font parser.

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I'm planning to make this a minimal-allocation TTF parser. This will
speed up start-up time for applications, but have some overhead for
rasterizing glyphs. Which should be okay, since rasterized glyph bitmaps
should be cached anyway.

This commit just adds the loading of the HEAD table.
This commit is contained in:
Srimanta Barua 2020-06-04 14:17:39 +05:30 • committed by Andreas Kling
parent 6cec7a2da6
commit be1586850d
3 changed files with 247 additions and 0 deletions
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83
Libraries/LibGfx/TTFont.h Normal file
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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/OwnPtr.h>
#include <AK/Result.h>
#include <AK/StringView.h>
namespace Gfx {
class TTFont;
enum class TTFIndexToLocFormat {
Offset16,
Offset32,
};
class TTFHead {
private:
TTFHead() {}
TTFHead(ByteBuffer&& slice)
: m_slice(move(slice))
{
ASSERT(m_slice.size() >= 54);
dbg() << "HEAD:"
<< "\n units_per_em: " << units_per_em()
<< "\n xmin: " << xmin()
<< "\n ymin: " << ymin()
<< "\n xmax: " << xmax()
<< "\n ymax: " << ymax()
<< "\n lowest_recommended_ppem: " << lowest_recommended_ppem();
}
u16 units_per_em() const;
i16 xmin() const;
i16 ymin() const;
i16 xmax() const;
i16 ymax() const;
u16 lowest_recommended_ppem() const;
Result<TTFIndexToLocFormat, i16> index_to_loc_format() const;
ByteBuffer m_slice;
bool m_is_init;
friend TTFont;
};
class TTFont {
public:
static OwnPtr<TTFont> load_from_file(const StringView& path, unsigned index);
private:
TTFont(AK::ByteBuffer&& buffer, u32 offset);
AK::ByteBuffer m_buffer;
TTFHead m_head;
};
}