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The check prevents the Ttf_font from violating the bounding box in the presence of very small scale values. This can happen during the startup of Sculpt. Before the framebuffer driver is up, Sculpt bases its dynamic font-size setting on a screen resolution of 1x1. Issue #3812
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/*
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* \brief TrueType 'Text_painter::Font'
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* \author Norman Feske
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* \date 2018-03-20
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*/
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/*
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* Copyright (C) 2018 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__GEMS__TTF_FONT_T_
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#define _INCLUDE__GEMS__TTF_FONT_T_
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#include <base/allocator.h>
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#include <nitpicker_gfx/text_painter.h>
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class Ttf_font : public Text_painter::Font
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{
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private:
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typedef Genode::int32_t int32_t;
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typedef Genode::Allocator Allocator;
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typedef Text_painter::Codepoint Codepoint;
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typedef Text_painter::Area Area;
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typedef Text_painter::Glyph Glyph;
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struct Stbtt_font_info;
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static Stbtt_font_info &_create_stbtt_font_info(Allocator &, void const *);
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Stbtt_font_info &_stbtt_font_info;
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float const _px;
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float const _scale;
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unsigned const _baseline;
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unsigned const _height;
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Area const _bounding_box;
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struct Glyph_buffer;
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Glyph_buffer &_glyph_buffer;
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public:
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struct Invalid_allocator : Genode::Exception { };
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struct Unsupported_data : Genode::Exception { };
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/**
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* Constructor
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*
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* \param alloc allocator for dynamic allocations
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* \param ttf TrueType font data
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* \param px size in pixels
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*
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* \throw Invalid_allocator 'alloc' is an allocator that needs
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* the block size for freeing a blocki
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* \throw Unsupported_data unable to parse 'ttf' data
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*/
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Ttf_font(Allocator &alloc, void const *ttf, float px);
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~Ttf_font();
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void _apply_glyph(Codepoint, Apply_fn const &) const override;
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Advance_info advance_info(Codepoint) const override;
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unsigned baseline() const override { return _baseline; }
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unsigned height() const override { return _height; }
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Area bounding_box() const override { return _bounding_box; }
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};
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#endif /* _INCLUDE__GEMS__TTF_FONT_T_ */
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