440 lines
17 KiB
C++
440 lines
17 KiB
C++
////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2007-2018 Laurent Gomila (laurent@sfml-dev.org)
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//
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// This software is provided 'as-is', without any express or implied warranty.
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it freely,
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// subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented;
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// you must not claim that you wrote the original software.
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// If you use this software in a product, an acknowledgment
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// in the product documentation would be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such,
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// and must not be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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////////////////////////////////////////////////////////////
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#ifndef SFML_FONT_HPP
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#define SFML_FONT_HPP
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////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics/Export.hpp>
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#include <SFML/Graphics/Glyph.hpp>
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#include <SFML/Graphics/Texture.hpp>
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#include <SFML/Graphics/Rect.hpp>
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#include <SFML/System/Vector2.hpp>
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#include <SFML/System/String.hpp>
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#include <map>
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#include <string>
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#include <vector>
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namespace sf
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{
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class InputStream;
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////////////////////////////////////////////////////////////
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/// \brief Class for loading and manipulating character fonts
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///
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////////////////////////////////////////////////////////////
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class SFML_GRAPHICS_API Font
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{
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public:
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////////////////////////////////////////////////////////////
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/// \brief Holds various information about a font
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///
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////////////////////////////////////////////////////////////
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struct Info
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{
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std::string family; ///< The font family
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};
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public:
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////////////////////////////////////////////////////////////
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/// \brief Default constructor
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///
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/// This constructor defines an empty font
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///
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////////////////////////////////////////////////////////////
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Font();
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////////////////////////////////////////////////////////////
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/// \brief Copy constructor
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///
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/// \param copy Instance to copy
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///
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////////////////////////////////////////////////////////////
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Font(const Font& copy);
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////////////////////////////////////////////////////////////
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/// \brief Destructor
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///
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/// Cleans up all the internal resources used by the font
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///
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////////////////////////////////////////////////////////////
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~Font();
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////////////////////////////////////////////////////////////
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/// \brief Load the font from a file
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///
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/// The supported font formats are: TrueType, Type 1, CFF,
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/// OpenType, SFNT, X11 PCF, Windows FNT, BDF, PFR and Type 42.
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/// Note that this function knows nothing about the standard
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/// fonts installed on the user's system, thus you can't
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/// load them directly.
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///
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/// \warning SFML cannot preload all the font data in this
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/// function, so the file has to remain accessible until
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/// the sf::Font object loads a new font or is destroyed.
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///
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/// \param filename Path of the font file to load
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromMemory, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromFile(const std::string& filename);
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////////////////////////////////////////////////////////////
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/// \brief Load the font from a file in memory
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///
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/// The supported font formats are: TrueType, Type 1, CFF,
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/// OpenType, SFNT, X11 PCF, Windows FNT, BDF, PFR and Type 42.
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///
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/// \warning SFML cannot preload all the font data in this
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/// function, so the buffer pointed by \a data has to remain
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/// valid until the sf::Font object loads a new font or
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/// is destroyed.
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///
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/// \param data Pointer to the file data in memory
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/// \param sizeInBytes Size of the data to load, in bytes
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromStream
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///
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////////////////////////////////////////////////////////////
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bool loadFromMemory(const void* data, std::size_t sizeInBytes);
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////////////////////////////////////////////////////////////
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/// \brief Load the font from a custom stream
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///
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/// The supported font formats are: TrueType, Type 1, CFF,
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/// OpenType, SFNT, X11 PCF, Windows FNT, BDF, PFR and Type 42.
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/// Warning: SFML cannot preload all the font data in this
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/// function, so the contents of \a stream have to remain
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/// valid as long as the font is used.
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///
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/// \warning SFML cannot preload all the font data in this
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/// function, so the stream has to remain accessible until
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/// the sf::Font object loads a new font or is destroyed.
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///
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/// \param stream Source stream to read from
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///
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/// \return True if loading succeeded, false if it failed
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///
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/// \see loadFromFile, loadFromMemory
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///
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////////////////////////////////////////////////////////////
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bool loadFromStream(InputStream& stream);
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////////////////////////////////////////////////////////////
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/// \brief Get the font information
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///
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/// \return A structure that holds the font information
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///
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////////////////////////////////////////////////////////////
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const Info& getInfo() const;
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////////////////////////////////////////////////////////////
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/// \brief Retrieve a glyph of the font
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///
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/// If the font is a bitmap font, not all character sizes
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/// might be available. If the glyph is not available at the
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/// requested size, an empty glyph is returned.
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///
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/// Be aware that using a negative value for the outline
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/// thickness will cause distorted rendering.
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///
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/// \param codePoint Unicode code point of the character to get
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/// \param characterSize Reference character size
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/// \param bold Retrieve the bold version or the regular one?
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/// \param outlineThickness Thickness of outline (when != 0 the glyph will not be filled)
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///
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/// \return The glyph corresponding to \a codePoint and \a characterSize
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///
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////////////////////////////////////////////////////////////
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const Glyph& getGlyph(Uint32 codePoint, unsigned int characterSize, bool bold, float outlineThickness = 0) const;
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////////////////////////////////////////////////////////////
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/// \brief Get the kerning offset of two glyphs
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///
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/// The kerning is an extra offset (negative) to apply between two
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/// glyphs when rendering them, to make the pair look more "natural".
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/// For example, the pair "AV" have a special kerning to make them
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/// closer than other characters. Most of the glyphs pairs have a
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/// kerning offset of zero, though.
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///
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/// \param first Unicode code point of the first character
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/// \param second Unicode code point of the second character
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/// \param characterSize Reference character size
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///
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/// \return Kerning value for \a first and \a second, in pixels
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///
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////////////////////////////////////////////////////////////
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float getKerning(Uint32 first, Uint32 second, unsigned int characterSize) const;
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////////////////////////////////////////////////////////////
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/// \brief Get the line spacing
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///
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/// Line spacing is the vertical offset to apply between two
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/// consecutive lines of text.
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///
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/// \param characterSize Reference character size
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///
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/// \return Line spacing, in pixels
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///
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////////////////////////////////////////////////////////////
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float getLineSpacing(unsigned int characterSize) const;
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////////////////////////////////////////////////////////////
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/// \brief Get the position of the underline
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///
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/// Underline position is the vertical offset to apply between the
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/// baseline and the underline.
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///
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/// \param characterSize Reference character size
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///
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/// \return Underline position, in pixels
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///
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/// \see getUnderlineThickness
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///
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////////////////////////////////////////////////////////////
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float getUnderlinePosition(unsigned int characterSize) const;
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////////////////////////////////////////////////////////////
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/// \brief Get the thickness of the underline
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///
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/// Underline thickness is the vertical size of the underline.
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///
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/// \param characterSize Reference character size
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///
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/// \return Underline thickness, in pixels
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///
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/// \see getUnderlinePosition
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///
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////////////////////////////////////////////////////////////
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float getUnderlineThickness(unsigned int characterSize) const;
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////////////////////////////////////////////////////////////
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/// \brief Retrieve the texture containing the loaded glyphs of a certain size
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///
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/// The contents of the returned texture changes as more glyphs
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/// are requested, thus it is not very relevant. It is mainly
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/// used internally by sf::Text.
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///
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/// \param characterSize Reference character size
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///
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/// \return Texture containing the glyphs of the requested size
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///
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////////////////////////////////////////////////////////////
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const Texture& getTexture(unsigned int characterSize) const;
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////////////////////////////////////////////////////////////
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/// \brief Overload of assignment operator
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///
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/// \param right Instance to assign
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///
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/// \return Reference to self
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///
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////////////////////////////////////////////////////////////
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Font& operator =(const Font& right);
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private:
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////////////////////////////////////////////////////////////
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/// \brief Structure defining a row of glyphs
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///
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////////////////////////////////////////////////////////////
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struct Row
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{
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Row(unsigned int rowTop, unsigned int rowHeight) : width(0), top(rowTop), height(rowHeight) {}
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unsigned int width; ///< Current width of the row
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unsigned int top; ///< Y position of the row into the texture
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unsigned int height; ///< Height of the row
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};
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////////////////////////////////////////////////////////////
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// Types
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////////////////////////////////////////////////////////////
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typedef std::map<Uint64, Glyph> GlyphTable; ///< Table mapping a codepoint to its glyph
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////////////////////////////////////////////////////////////
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/// \brief Structure defining a page of glyphs
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///
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////////////////////////////////////////////////////////////
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struct Page
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{
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Page();
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GlyphTable glyphs; ///< Table mapping code points to their corresponding glyph
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Texture texture; ///< Texture containing the pixels of the glyphs
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unsigned int nextRow; ///< Y position of the next new row in the texture
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std::vector<Row> rows; ///< List containing the position of all the existing rows
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};
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////////////////////////////////////////////////////////////
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/// \brief Free all the internal resources
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///
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////////////////////////////////////////////////////////////
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void cleanup();
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////////////////////////////////////////////////////////////
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/// \brief Load a new glyph and store it in the cache
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///
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/// \param codePoint Unicode code point of the character to load
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/// \param characterSize Reference character size
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/// \param bold Retrieve the bold version or the regular one?
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/// \param outlineThickness Thickness of outline (when != 0 the glyph will not be filled)
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///
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/// \return The glyph corresponding to \a codePoint and \a characterSize
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///
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////////////////////////////////////////////////////////////
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Glyph loadGlyph(Uint32 codePoint, unsigned int characterSize, bool bold, float outlineThickness) const;
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////////////////////////////////////////////////////////////
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/// \brief Find a suitable rectangle within the texture for a glyph
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///
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/// \param page Page of glyphs to search in
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/// \param width Width of the rectangle
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/// \param height Height of the rectangle
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///
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/// \return Found rectangle within the texture
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///
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////////////////////////////////////////////////////////////
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IntRect findGlyphRect(Page& page, unsigned int width, unsigned int height) const;
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////////////////////////////////////////////////////////////
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/// \brief Make sure that the given size is the current one
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///
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/// \param characterSize Reference character size
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///
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/// \return True on success, false if any error happened
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///
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////////////////////////////////////////////////////////////
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bool setCurrentSize(unsigned int characterSize) const;
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////////////////////////////////////////////////////////////
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// Types
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////////////////////////////////////////////////////////////
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typedef std::map<unsigned int, Page> PageTable; ///< Table mapping a character size to its page (texture)
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////////////////////////////////////////////////////////////
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// Member data
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////////////////////////////////////////////////////////////
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void* m_library; ///< Pointer to the internal library interface (it is typeless to avoid exposing implementation details)
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void* m_face; ///< Pointer to the internal font face (it is typeless to avoid exposing implementation details)
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void* m_streamRec; ///< Pointer to the stream rec instance (it is typeless to avoid exposing implementation details)
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void* m_stroker; ///< Pointer to the stroker (it is typeless to avoid exposing implementation details)
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int* m_refCount; ///< Reference counter used by implicit sharing
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Info m_info; ///< Information about the font
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mutable PageTable m_pages; ///< Table containing the glyphs pages by character size
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mutable std::vector<Uint8> m_pixelBuffer; ///< Pixel buffer holding a glyph's pixels before being written to the texture
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#ifdef SFML_SYSTEM_ANDROID
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void* m_stream; ///< Asset file streamer (if loaded from file)
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#endif
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};
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} // namespace sf
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#endif // SFML_FONT_HPP
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////////////////////////////////////////////////////////////
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/// \class sf::Font
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/// \ingroup graphics
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///
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/// Fonts can be loaded from a file, from memory or from a custom
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/// stream, and supports the most common types of fonts. See
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/// the loadFromFile function for the complete list of supported formats.
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///
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/// Once it is loaded, a sf::Font instance provides three
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/// types of information about the font:
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/// \li Global metrics, such as the line spacing
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/// \li Per-glyph metrics, such as bounding box or kerning
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/// \li Pixel representation of glyphs
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///
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/// Fonts alone are not very useful: they hold the font data
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/// but cannot make anything useful of it. To do so you need to
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/// use the sf::Text class, which is able to properly output text
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/// with several options such as character size, style, color,
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/// position, rotation, etc.
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/// This separation allows more flexibility and better performances:
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/// indeed a sf::Font is a heavy resource, and any operation on it
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/// is slow (often too slow for real-time applications). On the other
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/// side, a sf::Text is a lightweight object which can combine the
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/// glyphs data and metrics of a sf::Font to display any text on a
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/// render target.
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/// Note that it is also possible to bind several sf::Text instances
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/// to the same sf::Font.
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///
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/// It is important to note that the sf::Text instance doesn't
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/// copy the font that it uses, it only keeps a reference to it.
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/// Thus, a sf::Font must not be destructed while it is
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/// used by a sf::Text (i.e. never write a function that
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/// uses a local sf::Font instance for creating a text).
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///
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/// Usage example:
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/// \code
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/// // Declare a new font
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/// sf::Font font;
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///
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/// // Load it from a file
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/// if (!font.loadFromFile("arial.ttf"))
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/// {
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/// // error...
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/// }
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///
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/// // Create a text which uses our font
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/// sf::Text text1;
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/// text1.setFont(font);
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/// text1.setCharacterSize(30);
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/// text1.setStyle(sf::Text::Regular);
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///
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/// // Create another text using the same font, but with different parameters
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/// sf::Text text2;
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/// text2.setFont(font);
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/// text2.setCharacterSize(50);
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/// text2.setStyle(sf::Text::Italic);
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/// \endcode
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///
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/// Apart from loading font files, and passing them to instances
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/// of sf::Text, you should normally not have to deal directly
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/// with this class. However, it may be useful to access the
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/// font metrics or rasterized glyphs for advanced usage.
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///
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/// Note that if the font is a bitmap font, it is not scalable,
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/// thus not all requested sizes will be available to use. This
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/// needs to be taken into consideration when using sf::Text.
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/// If you need to display text of a certain size, make sure the
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/// corresponding bitmap font that supports that size is used.
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///
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/// \see sf::Text
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///
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////////////////////////////////////////////////////////////
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