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/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file gfx_layout.h Functions related to laying out the texts. */
#ifndef GFX_LAYOUT_H
#define GFX_LAYOUT_H
#include "fontcache.h"
#include "gfx_func.h"
#include "core/smallmap_type.hpp"
#include <map>
#include <string>
#include <stack>
#include <vector>
#ifdef WITH_ICU_LX
#include "layout/ParagraphLayout.h"
#define ICU_FONTINSTANCE : public icu::LEFontInstance
#else /* WITH_ICU_LX */
#define ICU_FONTINSTANCE
#endif /* WITH_ICU_LX */
/**
* Text drawing parameters, which can change while drawing a line, but are kept between multiple parts
* of the same text, e.g. on line breaks.
*/
struct FontState {
FontSize fontsize; ///< Current font size.
TextColour cur_colour; ///< Current text colour.
std::stack<TextColour, std::vector<TextColour>> colour_stack; ///< Stack of colours to assist with colour switching.
FontState() : fontsize(FS_END), cur_colour(TC_INVALID) {}
FontState(TextColour colour, FontSize fontsize) : fontsize(fontsize), cur_colour(colour) {}
/**
* Switch to new colour \a c.
* @param c New colour to use.
*/
inline void SetColour(TextColour c)
{
assert(c >= TC_BLUE && c <= TC_BLACK);
if ((this->cur_colour & TC_FORCED) == 0) this->cur_colour = c;
}
/**
* Switch to and pop the last saved colour on the stack.
*/
inline void PopColour()
{
if (colour_stack.empty()) return;
SetColour(colour_stack.top());
colour_stack.pop();
}
/**
* Push the current colour on to the stack.
*/
inline void PushColour()
{
colour_stack.push(this->cur_colour);
}
/**
* Switch to using a new font \a f.
* @param f New font to use.
*/
inline void SetFontSize(FontSize f)
{
this->fontsize = f;
}
};
/**
* Container with information about a font.
*/
class Font ICU_FONTINSTANCE {
public:
FontCache *fc; ///< The font we are using.
TextColour colour; ///< The colour this font has to be.
Font(FontSize size, TextColour colour);
#ifdef WITH_ICU_LX
/* Implementation details of LEFontInstance */
le_int32 getUnitsPerEM() const;
le_int32 getAscent() const;
le_int32 getDescent() const;
le_int32 getLeading() const;
float getXPixelsPerEm() const;
float getYPixelsPerEm() const;
float getScaleFactorX() const;
float getScaleFactorY() const;
const void *getFontTable(LETag tableTag) const;
const void *getFontTable(LETag tableTag, size_t &length) const;
LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;
void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
#endif /* WITH_ICU_LX */
};
/** Mapping from index to font. */
typedef SmallMap<int, Font *> FontMap;
/**
* Interface to glue fallback and normal layouter into one.
*/
class ParagraphLayouter {
public:
virtual ~ParagraphLayouter() {}
/** Visual run contains data about the bit of text with the same font. */
class VisualRun {
public:
virtual ~VisualRun() {}
virtual const Font *GetFont() const = 0;
virtual int GetGlyphCount() const = 0;
virtual const GlyphID *GetGlyphs() const = 0;
virtual const float *GetPositions() const = 0;
virtual int GetLeading() const = 0;
virtual const int *GetGlyphToCharMap() const = 0;
};
/** A single line worth of VisualRuns. */
class Line {
public:
virtual ~Line() {}
virtual int GetLeading() const = 0;
virtual int GetWidth() const = 0;
virtual int CountRuns() const = 0;
virtual const VisualRun &GetVisualRun(int run) const = 0;
virtual int GetInternalCharLength(WChar c) const = 0;
};
virtual void Reflow() = 0;
virtual std::unique_ptr<const Line> NextLine(int max_width) = 0;
};
/**
* The layouter performs all the layout work.
*
* It also accounts for the memory allocations and frees.
*/
class Layouter : public std::vector<std::unique_ptr<const ParagraphLayouter::Line>> {
const char *string; ///< Pointer to the original string.
/** Key into the linecache */
struct LineCacheKey {
FontState state_before; ///< Font state at the beginning of the line.
std::string str; ///< Source string of the line (including colour and font size codes).
/** Comparison operator for std::map */
bool operator<(const LineCacheKey &other) const
{
if (this->state_before.fontsize != other.state_before.fontsize) return this->state_before.fontsize < other.state_before.fontsize;
if (this->state_before.cur_colour != other.state_before.cur_colour) return this->state_before.cur_colour < other.state_before.cur_colour;
if (this->state_before.colour_stack != other.state_before.colour_stack) return this->state_before.colour_stack < other.state_before.colour_stack;
return this->str < other.str;
}
};
public:
/** Item in the linecache */
struct LineCacheItem {
/* Stuff that cannot be freed until the ParagraphLayout is freed */
void *buffer; ///< Accessed by both ICU's and our ParagraphLayout::nextLine.
FontMap runs; ///< Accessed by our ParagraphLayout::nextLine.
FontState state_after; ///< Font state after the line.
ParagraphLayouter *layout; ///< Layout of the line.
LineCacheItem() : buffer(nullptr), layout(nullptr) {}
~LineCacheItem() { delete layout; free(buffer); }
};
private:
typedef std::map<LineCacheKey, LineCacheItem> LineCache;
static LineCache *linecache;
static LineCacheItem &GetCachedParagraphLayout(const char *str, size_t len, const FontState &state);
typedef SmallMap<TextColour, Font *> FontColourMap;
static FontColourMap fonts[FS_END];
public:
static Font *GetFont(FontSize size, TextColour colour);
Layouter(const char *str, int maxw = INT32_MAX, TextColour colour = TC_FROMSTRING, FontSize fontsize = FS_NORMAL);
Dimension GetBounds();
Point GetCharPosition(const char *ch) const;
const char *GetCharAtPosition(int x) const;
static void ResetFontCache(FontSize size);
static void ResetLineCache();
static void ReduceLineCache();
};
#endif /* GFX_LAYOUT_H */
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