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/**
* @file llfontgl.h
* @author Doug Soo
* @brief Wrapper around FreeType
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLFONTGL_H
#define LL_LLFONTGL_H
#include "llfont.h"
#include "llimagegl.h"
#include "v2math.h"
#include "llcoord.h"
#include "llrect.h"
#include "llfontregistry.h"
class LLColor4;
// Key used to request a font.
class LLFontDescriptor;
// Structure used to store previously requested fonts.
class LLFontRegistry;
class LLFontGL : public LLFont
{
public:
enum HAlign
{
// Horizontal location of x,y coord to render.
LEFT = 0, // Left align
RIGHT = 1, // Right align
HCENTER = 2, // Center
};
enum VAlign
{
// Vertical location of x,y coord to render.
TOP = 3, // Top align
VCENTER = 4, // Center
BASELINE = 5, // Baseline
BOTTOM = 6 // Bottom
};
enum StyleFlags
{
// text style to render. May be combined (these are bit flags)
NORMAL = 0,
BOLD = 1,
ITALIC = 2,
UNDERLINE = 4,
DROP_SHADOW = 8,
DROP_SHADOW_SOFT = 16
};
// Takes a string with potentially several flags, i.e. "NORMAL|BOLD|ITALIC"
static U8 getStyleFromString(const std::string &style);
LLFontGL();
LLFontGL(const LLFontGL &source);
~LLFontGL();
void init(); // Internal init, or reinitialization
void reset(); // Reset a font after GL cleanup. ONLY works on an already loaded font.
LLFontGL &operator=(const LLFontGL &source);
static BOOL initDefaultFonts(F32 screen_dpi, F32 x_scale, F32 y_scale,
const std::string& app_dir,
const std::vector<std::string>& xui_paths);
static void destroyDefaultFonts();
static void destroyAllGL();
void destroyGL();
/* virtual*/ BOOL loadFace(const std::string& filename,
const F32 point_size, const F32 vert_dpi, const F32 horz_dpi,
const S32 components, BOOL is_fallback);
S32 renderUTF8(const std::string &text, const S32 begin_offset,
S32 x, S32 y,
const LLColor4 &color) const
{
return renderUTF8(text, begin_offset, (F32)x, (F32)y, color,
LEFT, BASELINE, NORMAL,
S32_MAX, S32_MAX, NULL, FALSE);
}
S32 renderUTF8(const std::string &text, const S32 begin_offset,
S32 x, S32 y,
const LLColor4 &color,
HAlign halign, VAlign valign, U8 style = NORMAL) const
{
return renderUTF8(text, begin_offset, (F32)x, (F32)y, color,
halign, valign, style,
S32_MAX, S32_MAX, NULL, FALSE);
}
// renderUTF8 does a conversion, so is slower!
S32 renderUTF8(const std::string &text,
S32 begin_offset,
F32 x, F32 y,
const LLColor4 &color,
HAlign halign,
VAlign valign,
U8 style,
S32 max_chars,
S32 max_pixels,
F32* right_x,
BOOL use_ellipses) const;
S32 render(const LLWString &text, const S32 begin_offset,
F32 x, F32 y,
const LLColor4 &color) const
{
return render(text, begin_offset, x, y, color,
LEFT, BASELINE, NORMAL,
S32_MAX, S32_MAX, NULL, FALSE, FALSE);
}
S32 render(const LLWString &text,
S32 begin_offset,
F32 x, F32 y,
const LLColor4 &color,
HAlign halign = LEFT,
VAlign valign = BASELINE,
U8 style = NORMAL,
S32 max_chars = S32_MAX,
S32 max_pixels = S32_MAX,
F32* right_x=NULL,
BOOL use_embedded = FALSE,
BOOL use_ellipses = FALSE) const;
// font metrics - override for LLFont that returns units of virtual pixels
/*virtual*/ F32 getLineHeight() const { return (F32)llround(mLineHeight / sScaleY); }
/*virtual*/ F32 getAscenderHeight() const { return (F32)llround(mAscender / sScaleY); }
/*virtual*/ F32 getDescenderHeight() const { return (F32)llround(mDescender / sScaleY); }
virtual S32 getWidth(const std::string& utf8text) const;
virtual S32 getWidth(const llwchar* wchars) const;
virtual S32 getWidth(const std::string& utf8text, const S32 offset, const S32 max_chars ) const;
virtual S32 getWidth(const llwchar* wchars, const S32 offset, const S32 max_chars, BOOL use_embedded = FALSE) const;
virtual F32 getWidthF32(const std::string& utf8text) const;
virtual F32 getWidthF32(const llwchar* wchars) const;
virtual F32 getWidthF32(const std::string& text, const S32 offset, const S32 max_chars ) const;
virtual F32 getWidthF32(const llwchar* wchars, const S32 offset, const S32 max_chars, BOOL use_embedded = FALSE ) const;
// The following are called often, frequently with large buffers, so do not use a string interface
// Returns the max number of complete characters from text (up to max_chars) that can be drawn in max_pixels
virtual S32 maxDrawableChars(const llwchar* wchars, F32 max_pixels, S32 max_chars = S32_MAX,
BOOL end_on_word_boundary = FALSE, const BOOL use_embedded = FALSE,
F32* drawn_pixels = NULL) const;
// Returns the index of the first complete characters from text that can be drawn in max_pixels
// given that the character at start_pos should be the last character (or as close to last as possible).
virtual S32 firstDrawableChar(const llwchar* wchars, F32 max_pixels, S32 text_len, S32 start_pos=S32_MAX, S32 max_chars = S32_MAX) const;
// Returns the index of the character closest to pixel position x (ignoring text to the right of max_pixels and max_chars)
virtual S32 charFromPixelOffset(const llwchar* wchars, const S32 char_offset,
F32 x, F32 max_pixels=F32_MAX, S32 max_chars = S32_MAX,
BOOL round = TRUE, BOOL use_embedded = FALSE) const;
LLImageGL *getImageGL() const;
void addEmbeddedChar( llwchar wc, LLImageGL* image, const std::string& label) const;
void addEmbeddedChar( llwchar wc, LLImageGL* image, const LLWString& label) const;
void removeEmbeddedChar( llwchar wc ) const;
static std::string nameFromFont(const LLFontGL* fontp);
static std::string nameFromHAlign(LLFontGL::HAlign align);
static LLFontGL::HAlign hAlignFromName(const std::string& name);
static std::string nameFromVAlign(LLFontGL::VAlign align);
static LLFontGL::VAlign vAlignFromName(const std::string& name);
static void setFontDisplay(BOOL flag) { sDisplayFont = flag ; }
protected:
struct embedded_data_t
{
embedded_data_t(LLImageGL* image, const LLWString& label) : mImage(image), mLabel(label) {}
LLPointer<LLImageGL> mImage;
LLWString mLabel;
};
const embedded_data_t* getEmbeddedCharData(const llwchar wch) const;
F32 getEmbeddedCharAdvance(const embedded_data_t* ext_data) const;
void clearEmbeddedChars();
void renderQuad(const LLRectf& screen_rect, const LLRectf& uv_rect, F32 slant_amt) const;
void drawGlyph(const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4& color, U8 style, F32 drop_shadow_fade) const;
public:
static F32 sVertDPI;
static F32 sHorizDPI;
static F32 sScaleX;
static F32 sScaleY;
static BOOL sDisplayFont ;
static std::string sAppDir; // For loading fonts
static LLFontGL* getFontMonospace();
static LLFontGL* getFontSansSerifSmall();
static LLFontGL* getFontSansSerif();
static LLFontGL* getFontSansSerifBigger();
static LLFontGL* getFontSansSerifLarge();
static LLFontGL* getFontSansSerifHuge();
static LLFontGL* getFontSansSerifBold();
static LLFontGL* getFontExtChar();
static LLFontGL* getFont(const LLFontDescriptor& desc);
static LLColor4 sShadowColor;
friend class LLTextBillboard;
friend class LLHUDText;
protected:
/*virtual*/ BOOL addChar(const llwchar wch) const;
protected:
typedef std::map<llwchar,embedded_data_t*> embedded_map_t;
mutable embedded_map_t mEmbeddedChars;
LLFontDescriptor mFontDesc;
// Registry holds all instantiated fonts.
static LLFontRegistry* sFontRegistry;
public:
static std::string getFontPathLocal();
static std::string getFontPathSystem();
static LLCoordFont sCurOrigin;
static std::vector<LLCoordFont> sOriginStack;
const LLFontDescriptor &getFontDesc() const { return mFontDesc; }
void setFontDesc(const LLFontDescriptor& font_desc) { mFontDesc = font_desc; }
};
#endif
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