Some minor llfont cleanup..more to come
This commit is contained in:
Drake Arconis
197
indra/llrender/llfontfreetype.h
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197
indra/llrender/llfontfreetype.h
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/**
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* @file llfont.h
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* @brief Font library wrapper
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*
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* $LicenseInfo:firstyear=2002&license=viewergpl$
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*
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* Copyright (c) 2002-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLFONTFREETYPE_H
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#define LL_LLFONTFREETYPE_H
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#include <map>
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#include "llmemory.h"
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#include "llstl.h"
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#include "llimagegl.h"
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#include "llfontbitmapcache.h"
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class LLImageRaw;
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class LLFontManager;
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class LLFontFreetype;
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// Hack. FT_Face is just a typedef for a pointer to a struct,
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// but there's no simple forward declarations file for FreeType,
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// and the main include file is 200K.
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// We'll forward declare the struct here. JC
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struct FT_FaceRec_;
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typedef struct FT_FaceRec_* LLFT_Face;
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extern LLFontManager *gFontManagerp;
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class LLFontManager
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{
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public:
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static void initClass();
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static void cleanupClass();
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public:
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LLFontManager();
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virtual ~LLFontManager();
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};
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class LLFontGlyphInfo
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{
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public:
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LLFontGlyphInfo(U32 index);
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public:
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U32 mGlyphIndex;
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// Metrics
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S32 mWidth; // In pixels
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S32 mHeight; // In pixels
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F32 mXAdvance; // In pixels
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F32 mYAdvance; // In pixels
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BOOL mMetricsValid; // We have up-to-date metrics for this glyph
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// Information for actually rendering
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BOOL mIsRendered; // We actually have rendered this glyph
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S32 mXBitmapOffset; // Offset to the origin in the bitmap
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S32 mYBitmapOffset; // Offset to the origin in the bitmap
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S32 mXBearing; // Distance from baseline to left in pixels
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S32 mYBearing; // Distance from baseline to top in pixels
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S32 mBitmapNum; // Which bitmap in the bitmap cache contains this glyph
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};
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// Used for lists of fallback fonts
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class LLFontList : public std::vector<LLFontFreetype*>
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{
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public:
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LLFontList();
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~LLFontList();
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void addAtEnd(LLFontFreetype *font);
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};
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class LLFontFreetype
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{
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public:
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LLFontFreetype();
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~LLFontFreetype();
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// is_fallback should be true for fallback fonts that aren't used
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// to render directly (Unicode backup, primarily)
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virtual BOOL loadFace(const std::string& filename,
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const F32 point_size,
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const F32 vert_dpi,
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const F32 horz_dpi,
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const S32 components,
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BOOL is_fallback);
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void setFallbackFont(LLFontList *fontp) { mFallbackFontp = fontp; }
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void setCharToGlyphMap(llwchar wch, U32 glyph_index) const;
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// Global font metrics - in units of pixels
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virtual F32 getLineHeight() const;
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virtual F32 getAscenderHeight() const;
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virtual F32 getDescenderHeight() const;
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// For a lowercase "g":
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//
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// ------------------------------
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// ^ ^
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// | |
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// xxx x |Ascender
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// x x v |
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// --------- xxxx-------------- Baseline
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// ^ x |
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// | Descender x |
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// v xxxx |LineHeight
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// ----------------------- |
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// v
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// ------------------------------
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enum
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{
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FIRST_CHAR = 32,
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NUM_CHARS = 127 - 32,
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LAST_CHAR_BASIC = 127,
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// Need full 8-bit ascii range for spanish
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NUM_CHARS_FULL = 255 - 32,
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LAST_CHAR_FULL = 255
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};
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const LLFontGlyphInfo &getMetrics(const llwchar wc) const;
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F32 getXAdvance(const llwchar wc) const;
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F32 getXKerning(const llwchar char_left, const llwchar char_right) const; // Get the kerning between the two characters
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virtual void reset() = 0;
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static bool sOpenGLcrashOnRestart;
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protected:
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virtual BOOL hasGlyph(const llwchar wch) const; // Has a glyph for this character
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virtual BOOL addChar(const llwchar wch) const; // Add a new character to the font if necessary
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virtual BOOL addGlyph(const llwchar wch, const U32 glyph_index) const; // Add a new glyph to the existing font
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virtual BOOL addGlyphFromFont(const LLFontFreetype *fontp, const llwchar wch, const U32 glyph_index) const; // Add a glyph from this font to the other (returns the glyph_index, 0 if not found)
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virtual LLFontGlyphInfo* getGlyphInfo(const llwchar wch) const;
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void insertGlyphInfo(llwchar wch, LLFontGlyphInfo* gi) const;
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void renderGlyph(const U32 glyph_index) const;
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void resetBitmapCache();
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protected:
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std::string mName;
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F32 mPointSize;
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F32 mAscender;
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F32 mDescender;
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F32 mLineHeight;
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mutable LLPointer<LLFontBitmapCache> mFontBitmapCachep;
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LLFT_Face mFTFace;
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BOOL mIsFallback;
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LLFontList *mFallbackFontp; // A list of fallback fonts to look for glyphs in (for Unicode chars)
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typedef std::map<llwchar, LLFontGlyphInfo*> char_glyph_info_map_t;
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mutable char_glyph_info_map_t mCharGlyphInfoMap; // Information about glyph location in bitmap
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BOOL mValid;
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void setSubImageLuminanceAlpha(const U32 x,
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const U32 y,
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const U32 bitmap_num,
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const U32 width,
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const U32 height,
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const U8 *data,
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S32 stride = 0) const;
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mutable S32 mRenderGlyphCount;
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mutable S32 mAddGlyphCount;
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};
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#endif // LL_FONTFREETYPE_H
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