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/**
* @file llfontfreetype.h
* @brief Font library wrapper
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* This library 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 have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLFONTFREETYPE_H
#define LL_LLFONTFREETYPE_H
#include <boost/unordered_map.hpp>
#include "llpointer.h"
#include "llstl.h"
#include "llimagegl.h"
#include "llfontbitmapcache.h"
// Hack. FT_Face is just a typedef for a pointer to a struct,
// but there's no simple forward declarations file for FreeType,
// and the main include file is 200K.
// We'll forward declare the struct here. JC
struct FT_FaceRec_;
typedef struct FT_FaceRec_* LLFT_Face;
struct FT_StreamRec_;
typedef struct FT_StreamRec_ LLFT_Stream;
class LLFontManager
{
public:
static void initClass();
static void cleanupClass();
private:
LLFontManager();
~LLFontManager();
};
struct LLFontGlyphInfo
{
LLFontGlyphInfo(U32 index);
U32 mGlyphIndex;
// Metrics
S32 mWidth; // In pixels
S32 mHeight; // In pixels
F32 mXAdvance; // In pixels
F32 mYAdvance; // In pixels
// Information for actually rendering
S32 mXBitmapOffset; // Offset to the origin in the bitmap
S32 mYBitmapOffset; // Offset to the origin in the bitmap
S32 mXBearing; // Distance from baseline to left in pixels
S32 mYBearing; // Distance from baseline to top in pixels
S32 mBitmapNum; // Which bitmap in the bitmap cache contains this glyph
};
extern LLFontManager *gFontManagerp;
class LLFontFreetype : public LLRefCount
{
public:
LLFontFreetype();
~LLFontFreetype();
// is_fallback should be true for fallback fonts that aren't used
// to render directly (Unicode backup, primarily)
bool loadFace(const std::string& filename, F32 point_size, F32 vert_dpi, F32 horz_dpi, S32 components, bool is_fallback, S32 face_n = 0);
S32 getNumFaces(const std::string& filename);
#ifdef LL_WINDOWS
S32 ftOpenFace(const std::string& filename, S32 face_n);
void clearFontStreams();
#endif
typedef std::vector<LLPointer<LLFontFreetype> > font_vector_t;
void setFallbackFonts(const font_vector_t &font);
const font_vector_t &getFallbackFonts() const;
// Global font metrics - in units of pixels
F32 getLineHeight() const;
F32 getAscenderHeight() const;
F32 getDescenderHeight() const;
// For a lowercase "g":
//
// ------------------------------
// ^ ^
// | |
// xxx x |Ascender
// x x v |
// --------- xxxx-------------- Baseline
// ^ x |
// | Descender x |
// v xxxx |LineHeight
// ----------------------- |
// v
// ------------------------------
enum
{
FIRST_CHAR = 32,
NUM_CHARS = 127 - 32,
LAST_CHAR_BASIC = 127,
// Need full 8-bit ascii range for spanish
NUM_CHARS_FULL = 255 - 32,
LAST_CHAR_FULL = 255
};
F32 getXAdvance(llwchar wc) const;
F32 getXAdvance(const LLFontGlyphInfo* glyph) const;
F32 getXKerning(llwchar char_left, llwchar char_right) const; // Get the kerning between the two characters
F32 getXKerning(const LLFontGlyphInfo* left_glyph_info, const LLFontGlyphInfo* right_glyph_info) const; // Get the kerning between the two characters
LLFontGlyphInfo* getGlyphInfo(llwchar wch) const;
void reset(F32 vert_dpi, F32 horz_dpi);
void destroyGL();
const std::string& getName() const;
const LLFontBitmapCache* getFontBitmapCache() const;
void setStyle(U8 style);
U8 getStyle() const;
private:
void resetBitmapCache();
void setSubImageLuminanceAlpha(U32 x, U32 y, U32 bitmap_num, U32 width, U32 height, U8 *data, S32 stride = 0) const;
bool hasGlyph(llwchar wch) const; // Has a glyph for this character
LLFontGlyphInfo* addGlyph(llwchar wch) const; // Add a new character to the font if necessary
LLFontGlyphInfo* addGlyphFromFont(const LLFontFreetype *fontp, llwchar wch, U32 glyph_index) const; // Add a glyph from this font to the other (returns the glyph_index, 0 if not found)
void renderGlyph(U32 glyph_index) const;
void insertGlyphInfo(llwchar wch, LLFontGlyphInfo* gi) const;
std::string mName;
U8 mStyle;
F32 mPointSize;
F32 mAscender;
F32 mDescender;
F32 mLineHeight;
LLFT_Face mFTFace;
#ifdef LL_WINDOWS
llifstream *pFileStream;
LLFT_Stream *pFtStream;
#endif
bool mIsFallback;
font_vector_t mFallbackFonts; // A list of fallback fonts to look for glyphs in (for Unicode chars)
typedef boost::unordered_map<llwchar, LLFontGlyphInfo*> char_glyph_info_map_t;
mutable char_glyph_info_map_t mCharGlyphInfoMap; // Information about glyph location in bitmap
mutable LLFontBitmapCache* mFontBitmapCachep;
mutable S32 mRenderGlyphCount;
mutable S32 mAddGlyphCount;
};
#endif // LL_FONTFREETYPE_H
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