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/**
* @file llfontgl.h
* @author Andrii Kleshchev
* @brief Buffer storage for font rendering.
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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_LLFONTVERTEXBUFFER_H
#define LL_LLFONTVERTEXBUFFER_H
#include "llfontgl.h"
class LLVertexBufferData;
// Rendering fonts is expensive, this class is intended to store
// vertex buffers for rendered text, so that they can be reused.
// LLFontVertexBuffer tracks font and rendering parameters, but
// expects caller to track text changes and call reset() when
// text changes.
class LLFontVertexBuffer
{
public:
LLFontVertexBuffer();
~LLFontVertexBuffer();
void reset();
S32 render(const LLFontGL* fontp,
const LLWString& text,
S32 begin_offset,
LLRect rect,
const LLColor4& color,
LLFontGL::HAlign halign = LLFontGL::LEFT, LLFontGL::VAlign valign = LLFontGL::BASELINE,
U8 style = LLFontGL::NORMAL,
LLFontGL::ShadowType shadow = LLFontGL::NO_SHADOW,
S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX,
F32* right_x = NULL,
bool use_ellipses = false,
bool use_color = true);
S32 render(const LLFontGL* fontp,
const LLWString& text,
S32 begin_offset,
LLRectf rect,
const LLColor4& color,
LLFontGL::HAlign halign = LLFontGL::LEFT, LLFontGL::VAlign valign = LLFontGL::BASELINE,
U8 style = LLFontGL::NORMAL,
LLFontGL::ShadowType shadow = LLFontGL::NO_SHADOW,
S32 max_chars = S32_MAX,
F32* right_x = NULL,
bool use_ellipses = false,
bool use_color = true);
S32 render(const LLFontGL* fontp,
const LLWString& text,
S32 begin_offset,
F32 x, F32 y,
const LLColor4& color,
LLFontGL::HAlign halign = LLFontGL::LEFT, LLFontGL::VAlign valign = LLFontGL::BASELINE,
U8 style = LLFontGL::NORMAL,
LLFontGL::ShadowType shadow = LLFontGL::NO_SHADOW,
S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX,
F32* right_x = NULL,
bool use_ellipses = false,
bool use_color = true);
static void enableBufferCollection(bool enable) { sEnableBufferCollection = enable; }
private:
void genBuffers(const LLFontGL* fontp,
const LLWString& text,
S32 begin_offset,
F32 x, F32 y,
const LLColor4& color,
LLFontGL::HAlign halign, LLFontGL::VAlign valign,
U8 style,
LLFontGL::ShadowType shadow,
S32 max_chars, S32 max_pixels,
F32* right_x,
bool use_ellipses,
bool use_color);
void renderBuffers();
std::list<LLVertexBufferData> mBufferList;
S32 mChars = 0;
const LLFontGL *mLastFont = nullptr;
S32 mLastOffset = 0;
S32 mLastMaxChars = 0;
S32 mLastMaxPixels = 0;
F32 mLastX = 0.f;
F32 mLastY = 0.f;
LLColor4 mLastColor;
LLFontGL::HAlign mLastHalign = LLFontGL::LEFT;
LLFontGL::VAlign mLastValign = LLFontGL::BASELINE;
U8 mLastStyle = LLFontGL::NORMAL;
LLFontGL::ShadowType mLastShadow = LLFontGL::NO_SHADOW;
F32 mLastRightX = 0.f;
// LLFontGL's statics
F32 mLastScaleX = 1.f;
F32 mLastScaleY = 1.f;
F32 mLastVertDPI = 0.f;
F32 mLastHorizDPI = 0.f;
S32 mLastResGeneration = 0;
LLCoordGL mLastOrigin;
// Adding new characters to bitmap cache can alter value from getBitmapWidth();
// which alters whole string. So rerender when new characters were added to cache.
S32 mLastFontCacheGen = 0;
static bool sEnableBufferCollection;
};
// Extracting width from a font is expensive, and due to
// mechanics of font rendering, we need width separately
// and usually before rendering.
// LLFontWidthBuffer tracks font and rendering parameters,
// but expects caller to track text changes and call reset()
// when text changes.
class LLFontWidthBuffer
{
public:
LLFontWidthBuffer();
~LLFontWidthBuffer();
void reset();
F32 getWidth(const LLFontGL* fontp,
const llwchar* wchars,
S32 begin_offset,
S32 max_chars,
bool no_padding);
static void enableBufferCollection(bool enable) { sEnableBufferCollection = enable; }
private:
const LLFontGL* mLastFont = nullptr;
S32 mLastOffset = 0;
S32 mLastMaxChars = 0;
bool mLastNoPadding = false;
F32 mWidth = -1.f;
// LLFontGL's values that affect width calculation
F32 mLastScaleX = 1.f;
F32 mLastScaleY = 1.f;
F32 mLastVertDPI = 0.f;
F32 mLastHorizDPI = 0.f;
S32 mLastResGeneration = 0;
// Cache generation tracking
S32 mLastFontCacheGen = 0;
static bool sEnableBufferCollection;
};
#endif
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