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It now allows to transparently select between FreeType and HarfBuzz layouting. The new class is built only if USE_HARFBUZZ is enabled.pull/278/head
Vladimír Vondruš
13 years ago
7 changed files with 204 additions and 75 deletions
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/*
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Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
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This file is part of Magnum. |
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Magnum is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License version 3 |
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only, as published by the Free Software Foundation. |
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Magnum is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Lesser General Public License version 3 for more details. |
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*/ |
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#include "HarfBuzzFont.h" |
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#include <hb-ft.h> |
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namespace Magnum { namespace Text { |
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namespace { |
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class HarfBuzzLayouter: public AbstractLayouter { |
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public: |
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HarfBuzzLayouter(HarfBuzzFont& font, const Float size, const std::string& text); |
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~HarfBuzzLayouter(); |
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std::tuple<Rectangle, Rectangle, Vector2> renderGlyph(const Vector2& cursorPosition, const UnsignedInt i) override; |
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private: |
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const HarfBuzzFont& font; |
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hb_buffer_t* buffer; |
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hb_glyph_info_t* glyphInfo; |
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hb_glyph_position_t* glyphPositions; |
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const Float size; |
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}; |
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} |
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HarfBuzzFont::HarfBuzzFont(FreeTypeFontRenderer& renderer, const std::string& fontFile, Float size): FreeTypeFont(renderer, fontFile, size) { |
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finishConstruction(); |
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} |
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HarfBuzzFont::HarfBuzzFont(FreeTypeFontRenderer& renderer, const unsigned char* data, std::size_t dataSize, Float size): FreeTypeFont(renderer, data, dataSize, size) { |
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finishConstruction(); |
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} |
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void HarfBuzzFont::finishConstruction() { |
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/* Create Harfbuzz font */ |
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_hbFont = hb_ft_font_create(_ftFont, nullptr); |
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} |
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HarfBuzzFont::~HarfBuzzFont() { |
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hb_font_destroy(_hbFont); |
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} |
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AbstractLayouter* HarfBuzzFont::layout(const Float size, const std::string& text) { |
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return new HarfBuzzLayouter(*this, size, text); |
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} |
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namespace { |
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HarfBuzzLayouter::HarfBuzzLayouter(HarfBuzzFont& font, const Float size, const std::string& text): font(font), size(size) { |
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/* Prepare HarfBuzz buffer */ |
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buffer = hb_buffer_create(); |
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hb_buffer_set_direction(buffer, HB_DIRECTION_LTR); |
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hb_buffer_set_script(buffer, HB_SCRIPT_LATIN); |
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hb_buffer_set_language(buffer, hb_language_from_string("en", 2)); |
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/* Layout the text */ |
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hb_buffer_add_utf8(buffer, text.c_str(), -1, 0, -1); |
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hb_shape(font.font(), buffer, nullptr, 0); |
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glyphInfo = hb_buffer_get_glyph_infos(buffer, &_glyphCount); |
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glyphPositions = hb_buffer_get_glyph_positions(buffer, &_glyphCount); |
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} |
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HarfBuzzLayouter::~HarfBuzzLayouter() { |
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/* Destroy HarfBuzz buffer */ |
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hb_buffer_destroy(buffer); |
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} |
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std::tuple<Rectangle, Rectangle, Vector2> HarfBuzzLayouter::renderGlyph(const Vector2& cursorPosition, const UnsignedInt i) { |
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/* Position of the texture in the resulting glyph, texture coordinates */ |
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Rectangle texturePosition, textureCoordinates; |
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std::tie(texturePosition, textureCoordinates) = font[glyphInfo[i].codepoint]; |
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/* Glyph offset and advance to next glyph in normalized coordinates */ |
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Vector2 offset = Vector2(glyphPositions[i].x_offset, |
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glyphPositions[i].y_offset)/(64*font.size()); |
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Vector2 advance = Vector2(glyphPositions[i].x_advance, |
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glyphPositions[i].y_advance)/(64*font.size()); |
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/* Absolute quad position, composed from cursor position, glyph offset
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and texture position, denormalized to requested text size */ |
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Rectangle quadPosition = Rectangle::fromSize( |
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(cursorPosition + offset + Vector2(texturePosition.left(), texturePosition.bottom()))*size, |
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texturePosition.size()*size); |
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return std::make_tuple(quadPosition, textureCoordinates, advance); |
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} |
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} |
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}} |
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@ -0,0 +1,75 @@ |
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#ifndef Magnum_Text_HarfBuzzFont_h |
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#define Magnum_Text_HarfBuzzFont_h |
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/*
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Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
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This file is part of Magnum. |
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Magnum is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License version 3 |
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only, as published by the Free Software Foundation. |
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Magnum is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Lesser General Public License version 3 for more details. |
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*/ |
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/** @file
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* @brief Class Magnum::Text::HarfBuzzFont |
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*/ |
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#include "Text/FreeTypeFont.h" |
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#ifndef DOXYGEN_GENERATING_OUTPUT |
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struct hb_font_t; |
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#endif |
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#ifndef MAGNUM_USE_HARFBUZZ |
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#error Magnum is not compiled with HarfBuzz support |
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#endif |
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namespace Magnum { namespace Text { |
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/**
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@brief HarfBuzz font |
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Improves FreeTypeFont with [HarfBuzz](http://www.freedesktop.org/wiki/Software/HarfBuzz)
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text layouting capabilities, such as kerning, ligatures etc. See FreeTypeFont |
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class documentation for more information about usage. |
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*/ |
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class MAGNUM_TEXT_EXPORT HarfBuzzFont: public FreeTypeFont { |
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public: |
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/**
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* @brief Create font from file |
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* @param renderer %Font renderer |
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* @param fontFile %Font file |
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* @param size %Font size |
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*/ |
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explicit HarfBuzzFont(FreeTypeFontRenderer& renderer, const std::string& fontFile, Float size); |
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/**
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* @brief Create font from memory |
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* @param renderer %Font renderer |
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* @param data %Font data |
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* @param dataSize %Font data size |
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* @param size %Font size |
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*/ |
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explicit HarfBuzzFont(FreeTypeFontRenderer& renderer, const unsigned char* data, std::size_t dataSize, Float size); |
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~HarfBuzzFont(); |
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/** @brief HarfBuzz font handle */ |
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inline hb_font_t* font() { return _hbFont; } |
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AbstractLayouter* layout(const Float size, const std::string& text) override; |
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private: |
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void MAGNUM_TEXT_LOCAL finishConstruction(); |
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hb_font_t* _hbFont; |
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}; |
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}} |
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#endif |
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