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/* GRAPHITE2 LICENSING
Copyright 2012, SIL International
All rights reserved.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of License, or
(at your option) any later version.
This program 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
Lesser General Public License for more details.
You should also have received a copy of the GNU Lesser General Public
License along with this library in the file named "LICENSE".
If not, write to the Free Software Foundation, 51 Franklin Street,
Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
internet at http://www.fsf.org/licenses/lgpl.html.
Alternatively, the contents of this file may be used under the terms of the
Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
License, as published by the Free Software Foundation, either version 2
of the License or (at your option) any later version.
*/
#pragma once
#include "graphite2/Font.h"
#include "inc/Main.h"
#include "inc/Position.h"
#include "inc/GlyphFace.h"
namespace graphite2 {
class Face;
class FeatureVal;
class Segment;
struct SlantBox
{
static const SlantBox empty;
// SlantBox(float psi = 0., float pdi = 0., float psa = 0., float pda = 0.) : si(psi), di(pdi), sa(psa), da(pda) {};
float width() const { return sa - si; }
float height() const { return da - di; }
float si; // min
float di; // min
float sa; // max
float da; // max
};
struct BBox
{
BBox(float pxi = 0, float pyi = 0., float pxa = 0., float pya = 0.) : xi(pxi), yi(pyi), xa(pxa), ya(pya) {};
float width() const { return xa - xi; }
float height() const { return ya - yi; }
float xi; // min
float yi; // min
float xa; // max
float ya; // max
};
class GlyphBox
{
GlyphBox(const GlyphBox &);
GlyphBox & operator = (const GlyphBox &);
public:
GlyphBox(uint8 numsubs, unsigned short bitmap, Rect *slanted) : _num(numsubs), _bitmap(bitmap), _slant(*slanted) {};
void addSubBox(int subindex, int boundary, Rect *val) { _subs[subindex * 2 + boundary] = *val; }
Rect &subVal(int subindex, int boundary) { return _subs[subindex * 2 + boundary]; }
const Rect &slant() const { return _slant; }
uint8 num() const { return _num; }
const Rect *subs() const { return _subs; }
private:
uint8 _num;
unsigned short _bitmap;
Rect _slant;
Rect _subs[1];
};
class GlyphCache
{
class Loader;
GlyphCache(const GlyphCache&);
GlyphCache& operator=(const GlyphCache&);
public:
GlyphCache(const Face & face, const uint32 face_options);
~GlyphCache();
unsigned short numGlyphs() const throw();
unsigned short numAttrs() const throw();
unsigned short unitsPerEm() const throw();
const GlyphFace *glyph(unsigned short glyphid) const; //result may be changed by subsequent call with a different glyphid
const GlyphFace *glyphSafe(unsigned short glyphid) const;
float getBoundingMetric(unsigned short glyphid, uint8 metric) const;
uint8 numSubBounds(unsigned short glyphid) const;
float getSubBoundingMetric(unsigned short glyphid, uint8 subindex, uint8 metric) const;
const Rect & slant(unsigned short glyphid) const { return _boxes[glyphid] ? _boxes[glyphid]->slant() : _empty_slant_box; }
const SlantBox & getBoundingSlantBox(unsigned short glyphid) const;
const BBox & getBoundingBBox(unsigned short glyphid) const;
const SlantBox & getSubBoundingSlantBox(unsigned short glyphid, uint8 subindex) const;
const BBox & getSubBoundingBBox(unsigned short glyphid, uint8 subindex) const;
bool check(unsigned short glyphid) const;
bool hasBoxes() const { return _boxes != 0; }
CLASS_NEW_DELETE;
private:
const Rect _empty_slant_box;
const Loader * _glyph_loader;
const GlyphFace * * _glyphs;
GlyphBox * * _boxes;
unsigned short _num_glyphs,
_num_attrs,
_upem;
};
inline
unsigned short GlyphCache::numGlyphs() const throw()
{
return _num_glyphs;
}
inline
unsigned short GlyphCache::numAttrs() const throw()
{
return _num_attrs;
}
inline
unsigned short GlyphCache::unitsPerEm() const throw()
{
return _upem;
}
inline
bool GlyphCache::check(unsigned short glyphid) const
{
return _boxes && glyphid < _num_glyphs;
}
inline
const GlyphFace *GlyphCache::glyphSafe(unsigned short glyphid) const
{
return glyphid < _num_glyphs ? glyph(glyphid) : NULL;
}
inline
float GlyphCache::getBoundingMetric(unsigned short glyphid, uint8 metric) const
{
if (glyphid >= _num_glyphs) return 0.;
switch (metric) {
case 0: return (float)(glyph(glyphid)->theBBox().bl.x); // x_min
case 1: return (float)(glyph(glyphid)->theBBox().bl.y); // y_min
case 2: return (float)(glyph(glyphid)->theBBox().tr.x); // x_max
case 3: return (float)(glyph(glyphid)->theBBox().tr.y); // y_max
case 4: return (float)(_boxes[glyphid] ? _boxes[glyphid]->slant().bl.x : 0.f); // sum_min
case 5: return (float)(_boxes[glyphid] ? _boxes[glyphid]->slant().bl.y : 0.f); // diff_min
case 6: return (float)(_boxes[glyphid] ? _boxes[glyphid]->slant().tr.x : 0.f); // sum_max
case 7: return (float)(_boxes[glyphid] ? _boxes[glyphid]->slant().tr.y : 0.f); // diff_max
default: return 0.;
}
}
inline const SlantBox &GlyphCache::getBoundingSlantBox(unsigned short glyphid) const
{
return _boxes[glyphid] ? *(SlantBox *)(&(_boxes[glyphid]->slant())) : SlantBox::empty;
}
inline const BBox &GlyphCache::getBoundingBBox(unsigned short glyphid) const
{
return *(BBox *)(&(glyph(glyphid)->theBBox()));
}
inline
float GlyphCache::getSubBoundingMetric(unsigned short glyphid, uint8 subindex, uint8 metric) const
{
GlyphBox *b = _boxes[glyphid];
if (b == NULL || subindex >= b->num()) return 0;
switch (metric) {
case 0: return b->subVal(subindex, 0).bl.x;
case 1: return b->subVal(subindex, 0).bl.y;
case 2: return b->subVal(subindex, 0).tr.x;
case 3: return b->subVal(subindex, 0).tr.y;
case 4: return b->subVal(subindex, 1).bl.x;
case 5: return b->subVal(subindex, 1).bl.y;
case 6: return b->subVal(subindex, 1).tr.x;
case 7: return b->subVal(subindex, 1).tr.y;
default: return 0.;
}
}
inline const SlantBox &GlyphCache::getSubBoundingSlantBox(unsigned short glyphid, uint8 subindex) const
{
GlyphBox *b = _boxes[glyphid];
return *(SlantBox *)(b->subs() + 2 * subindex + 1);
}
inline const BBox &GlyphCache::getSubBoundingBBox(unsigned short glyphid, uint8 subindex) const
{
GlyphBox *b = _boxes[glyphid];
return *(BBox *)(b->subs() + 2 * subindex);
}
inline
uint8 GlyphCache::numSubBounds(unsigned short glyphid) const
{
return _boxes[glyphid] ? _boxes[glyphid]->num() : 0;
}
} // namespace graphite2
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