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110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
11 years ago
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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file gfx_layout.h Functions related to laying out the texts. */
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#ifndef GFX_LAYOUT_H
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#define GFX_LAYOUT_H
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#include "fontcache.h"
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#include "gfx_func.h"
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#include "core/smallmap_type.hpp"
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/**
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* Container with information about a font.
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*/
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class Font {
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public:
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FontCache *fc; ///< The font we are using.
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TextColour colour; ///< The colour this font has to be.
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Font(FontSize size, TextColour colour);
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};
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/** Mapping from index to font. */
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typedef SmallMap<int, Font *> FontMap;
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/**
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* Class handling the splitting of a paragraph of text into lines and
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* visual runs.
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*
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* One constructs this class with the text that needs to be split into
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* lines. Then nextLine is called with the maximum with until NULL is
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* returned. Each nextLine call creates VisualRuns which contain the
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* length of text that are to be drawn with the same font. In other
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* words, the result of this class is a list of sub strings with their
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* font. The sub strings are then already fully laid out, and only
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* need actual drawing.
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*
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* The positions in a visual run are sequential pairs of X,Y of the
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* begin of each of the glyphs plus an extra pair to mark the end.
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*
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* @note This variant does not handle left-to-right properly. This
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* is supported in the one ParagraphLayout coming from ICU.
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* @note Does not conform to function naming style as it provides a
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* fallback for the ICU class.
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*/
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class ParagraphLayout {
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public:
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/** Visual run contains data about the bit of text with the same font. */
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class VisualRun {
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Font *font; ///< The font used to layout these.
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GlyphID *glyphs; ///< The glyphs we're drawing.
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float *positions; ///< The positions of the glyphs.
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int glyph_count; ///< The number of glyphs.
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public:
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VisualRun(Font *font, const WChar *chars, int glyph_count, int x);
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~VisualRun();
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Font *getFont() const;
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int getGlyphCount() const;
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const GlyphID *getGlyphs() const;
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float *getPositions() const;
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int getLeading() const;
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};
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/** A single line worth of VisualRuns. */
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class Line : public AutoDeleteSmallVector<VisualRun *, 4> {
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public:
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int getLeading() const;
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int getWidth() const;
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int countRuns() const;
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VisualRun *getVisualRun(int run) const;
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};
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const WChar *buffer_begin; ///< Begin of the buffer.
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WChar *buffer; ///< The current location in the buffer.
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FontMap &runs; ///< The fonts we have to use for this paragraph.
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ParagraphLayout(WChar *buffer, int length, FontMap &runs);
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Line *nextLine(int max_width);
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};
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/**
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* The layouter performs all the layout work.
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*
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* It also accounts for the memory allocations and frees.
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*/
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class Layouter : public AutoDeleteSmallVector<ParagraphLayout::Line *, 4> {
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typedef WChar CharType; ///< The type of character used within the layouter.
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size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, WChar c);
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ParagraphLayout *GetParagraphLayout(CharType *buff);
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CharType buffer[DRAW_STRING_BUFFER]; ///< Buffer for the text that is going to be drawn.
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FontMap fonts; ///< The fonts needed for drawing.
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public:
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Layouter(const char *str, int maxw = INT32_MAX, TextColour colour = TC_FROMSTRING, FontSize fontsize = FS_NORMAL);
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~Layouter();
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Dimension GetBounds();
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};
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#endif /* GFX_LAYOUT_H */
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