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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_VCL_INC_WIN_WINLAYOUT_HXX
#define INCLUDED_VCL_INC_WIN_WINLAYOUT_HXX
#include <rtl/ustring.hxx>
#include <sallayout.hxx>
#include <svsys.h>
#include <win/salgdi.h>
#include <opengl/PackedTextureAtlas.hxx>
class WinFontInstance;
namespace
{
// Extra space at the top and bottom of the glyph in total = tmHeight / GLYPH_SPACE_RATIO;
const int GLYPH_SPACE_RATIO = 8;
// Border size at the top of the glyph = tmHeight / GLYPH_OFFSET_RATIO;
const int GLYPH_OFFSET_RATIO = GLYPH_SPACE_RATIO * 2;
}
struct OpenGLGlyphDrawElement
{
tools::Rectangle maLocation;
int maLeftOverhangs;
OpenGLTexture maTexture;
int mnBaselineOffset;
int mnHeight;
bool mbVertical;
int getExtraSpace() const
{
return std::max(mnHeight / GLYPH_SPACE_RATIO, 4);
}
int getExtraOffset() const
{
return std::max(mnHeight / GLYPH_OFFSET_RATIO, 2);
}
};
class GlyphCache;
struct GlobalGlyphCache
{
GlobalGlyphCache()
: maPackedTextureAtlas(2048, 2048)
{}
PackedTextureAtlasManager maPackedTextureAtlas;
std::unordered_set<GlyphCache*> maGlyphCaches;
static GlobalGlyphCache * get();
};
class GlyphCache
{
private:
std::unordered_map<int, OpenGLGlyphDrawElement> maOpenGLTextureCache;
public:
GlyphCache()
{
GlobalGlyphCache::get()->maGlyphCaches.insert(this);
}
~GlyphCache()
{
GlobalGlyphCache::get()->maGlyphCaches.erase(this);
}
static bool ReserveTextureSpace(OpenGLGlyphDrawElement& rElement, int nWidth, int nHeight)
{
GlobalGlyphCache* pGlobalGlyphCache = GlobalGlyphCache::get();
rElement.maTexture = pGlobalGlyphCache->maPackedTextureAtlas.Reserve(nWidth, nHeight);
if (!rElement.maTexture)
return false;
std::vector<GLuint> aTextureIDs = pGlobalGlyphCache->maPackedTextureAtlas.ReduceTextureNumber(8);
if (!aTextureIDs.empty())
{
for (auto& pGlyphCache: pGlobalGlyphCache->maGlyphCaches)
{
pGlyphCache->RemoveTextures(aTextureIDs);
}
}
return true;
}
void RemoveTextures(std::vector<GLuint>& rTextureIDs)
{
auto it = maOpenGLTextureCache.begin();
while (it != maOpenGLTextureCache.end())
{
GLuint nTextureID = it->second.maTexture.Id();
if (std::find(rTextureIDs.begin(), rTextureIDs.end(), nTextureID) != rTextureIDs.end())
{
it = maOpenGLTextureCache.erase(it);
}
else
{
++it;
}
}
}
void PutDrawElementInCache(const OpenGLGlyphDrawElement& rElement, int nGlyphIndex)
{
assert(!IsGlyphCached(nGlyphIndex));
maOpenGLTextureCache[nGlyphIndex] = OpenGLGlyphDrawElement(rElement);
}
OpenGLGlyphDrawElement& GetDrawElement(int nGlyphIndex)
{
assert(IsGlyphCached(nGlyphIndex));
return maOpenGLTextureCache[nGlyphIndex];
}
bool IsGlyphCached(int nGlyphIndex) const
{
return maOpenGLTextureCache.find(nGlyphIndex) != maOpenGLTextureCache.end();
}
};
// win32 specific physical font instance
class WinFontInstance : public LogicalFontInstance
{
friend rtl::Reference<LogicalFontInstance> WinFontFace::CreateFontInstance(const FontSelectPatternAttributes&) const;
public:
virtual ~WinFontInstance() override;
bool CacheGlyphToAtlas(HDC hDC, HFONT hFont, int nGlyphIndex, SalGraphics& rGraphics);
GlyphCache& GetGlyphCache() { return maGlyphCache; }
bool hasHScale() const;
void SetHFONT(const HFONT);
HFONT GetHFONT() const { return m_hFont; }
// Prevent deletion of the HFONT in the WinFontInstance destructor
// Used for the ScopedFont handling
void UnsetHFONT() { m_hFont = nullptr; }
private:
explicit WinFontInstance(const PhysicalFontFace&, const FontSelectPatternAttributes&);
virtual hb_font_t* ImplInitHbFont() override;
HFONT m_hFont;
GlyphCache maGlyphCache;
};
class TextOutRenderer
{
protected:
explicit TextOutRenderer() = default;
TextOutRenderer(const TextOutRenderer &) = delete;
TextOutRenderer & operator = (const TextOutRenderer &) = delete;
public:
static TextOutRenderer & get(bool bUseDWrite);
virtual ~TextOutRenderer() = default;
virtual bool operator ()(GenericSalLayout const &rLayout,
SalGraphics &rGraphics,
HDC hDC) = 0;
};
class ExTextOutRenderer : public TextOutRenderer
{
ExTextOutRenderer(const ExTextOutRenderer &) = delete;
ExTextOutRenderer & operator = (const ExTextOutRenderer &) = delete;
public:
explicit ExTextOutRenderer() = default;
bool operator ()(GenericSalLayout const &rLayout,
SalGraphics &rGraphics,
HDC hDC) override;
};
#endif // INCLUDED_VCL_INC_WIN_WINLAYOUT_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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