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/**
* @file llfontgl.h
* @author Doug Soo
* @brief Wrapper around FreeType
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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_LLFONTGL_H
#define LL_LLFONTGL_H
#include "llcoord.h"
#include "llfontregistry.h"
#include "llimagegl.h"
#include "llpointer.h"
#include "llrect.h"
#include "v2math.h"
class LLColor4;
// Key used to request a font.
class LLFontDescriptor;
class LLFontFreetype;
// Structure used to store previously requested fonts.
class LLFontRegistry;
class LLFontGL
{
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 = 0x00,
BOLD = 0x01,
ITALIC = 0x02,
UNDERLINE = 0x04
};
enum ShadowType
{
NO_SHADOW,
DROP_SHADOW,
DROP_SHADOW_SOFT
};
LLFontGL();
~LLFontGL();
void reset(); // Reset a font after GL cleanup. ONLY works on an already loaded font.
void destroyGL();
BOOL loadFace(const std::string& filename, F32 point_size, const F32 vert_dpi, const F32 horz_dpi, const S32 components, BOOL is_fallback);
S32 render(const LLWString &text, S32 begin_offset,
const LLRect& rect,
const LLColor4 &color,
HAlign halign = LEFT, VAlign valign = BASELINE,
U8 style = NORMAL, ShadowType shadow = NO_SHADOW,
S32 max_chars = S32_MAX,
F32* right_x=NULL,
BOOL use_ellipses = FALSE) const;
S32 render(const LLWString &text, S32 begin_offset,
const LLRectf& rect,
const LLColor4 &color,
HAlign halign = LEFT, VAlign valign = BASELINE,
U8 style = NORMAL, ShadowType shadow = NO_SHADOW,
S32 max_chars = S32_MAX,
F32* right_x=NULL,
BOOL use_ellipses = FALSE) const;
S32 render(const LLWString &text, S32 begin_offset,
F32 x, F32 y,
const LLColor4 &color,
HAlign halign = LEFT, VAlign valign = BASELINE,
U8 style = NORMAL, ShadowType shadow = NO_SHADOW,
S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX,
F32* right_x=NULL,
BOOL use_ellipses = FALSE) const;
S32 render(const LLWString &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color) const;
// 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, ShadowType shadow, S32 max_chars, S32 max_pixels, F32* right_x, BOOL use_ellipses) const;
S32 renderUTF8(const std::string &text, S32 begin_offset, S32 x, S32 y, const LLColor4 &color) const;
S32 renderUTF8(const std::string &text, S32 begin_offset, S32 x, S32 y, const LLColor4 &color, HAlign halign, VAlign valign, U8 style = NORMAL, ShadowType shadow = NO_SHADOW) const;
// font metrics - override for LLFontFreetype that returns units of virtual pixels
F32 getAscenderHeight() const;
F32 getDescenderHeight() const;
S32 getLineHeight() const;
S32 getWidth(const std::string& utf8text) const;
S32 getWidth(const llwchar* wchars) const;
S32 getWidth(const std::string& utf8text, S32 offset, S32 max_chars ) const;
S32 getWidth(const llwchar* wchars, S32 offset, S32 max_chars) const;
F32 getWidthF32(const std::string& utf8text) const;
F32 getWidthF32(const llwchar* wchars) const;
F32 getWidthF32(const std::string& text, S32 offset, S32 max_chars ) const;
F32 getWidthF32(const llwchar* wchars, S32 offset, S32 max_chars) 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
typedef enum e_word_wrap_style
{
ONLY_WORD_BOUNDARIES,
WORD_BOUNDARY_IF_POSSIBLE,
ANYWHERE
} EWordWrapStyle ;
S32 maxDrawableChars(const llwchar* wchars, F32 max_pixels, S32 max_chars = S32_MAX, EWordWrapStyle end_on_word_boundary = ANYWHERE) 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).
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)
S32 charFromPixelOffset(const llwchar* wchars, S32 char_offset, F32 x, F32 max_pixels=F32_MAX, S32 max_chars = S32_MAX, BOOL round = TRUE) const;
const LLFontDescriptor& getFontDesc() const;
static void initClass(F32 screen_dpi, F32 x_scale, F32 y_scale, const std::string& app_dir, bool create_gl_textures = true);
// Load sans-serif, sans-serif-small, etc.
// Slow, requires multiple seconds to load fonts.
static bool loadDefaultFonts();
static void destroyDefaultFonts();
static void destroyAllGL();
// Takes a string with potentially several flags, i.e. "NORMAL|BOLD|ITALIC"
static U8 getStyleFromString(const std::string &style);
static std::string getStringFromStyle(U8 style);
static std::string nameFromFont(const LLFontGL* fontp);
static std::string sizeFromFont(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; }
static LLFontGL* getFontMonospace();
static LLFontGL* getFontSansSerifSmall();
static LLFontGL* getFontSansSerif();
static LLFontGL* getFontSansSerifBig();
static LLFontGL* getFontSansSerifHuge();
static LLFontGL* getFontSansSerifBold();
static LLFontGL* getFontExtChar();
static LLFontGL* getFont(const LLFontDescriptor& desc);
// Use with legacy names like "SANSSERIF_SMALL" or "OCRA"
static LLFontGL* getFontByName(const std::string& name);
static LLFontGL* getFontDefault(); // default fallback font
static std::string getFontPathLocal();
static std::string getFontPathSystem();
static LLCoordGL sCurOrigin;
static F32 sCurDepth;
static std::vector<std::pair<LLCoordGL, F32> > sOriginStack;
static LLColor4 sShadowColor;
static F32 sVertDPI;
static F32 sHorizDPI;
static F32 sScaleX;
static F32 sScaleY;
static BOOL sDisplayFont ;
static std::string sAppDir; // For loading fonts
private:
friend class LLFontRegistry;
friend class LLTextBillboard;
friend class LLHUDText;
LLFontGL(const LLFontGL &source);
LLFontGL &operator=(const LLFontGL &source);
LLFontDescriptor mFontDescriptor;
LLPointer<LLFontFreetype> mFontFreetype;
void renderQuad(LLVector3* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, F32 slant_amt) const;
void drawGlyph(S32& glyph_count, LLVector3* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, U8 style, ShadowType shadow, F32 drop_shadow_fade) const;
// Registry holds all instantiated fonts.
static LLFontRegistry* sFontRegistry;
};
#endif
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