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103 lines
2.9 KiB
103 lines
2.9 KiB
5 years ago
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================//
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#ifndef FONTTEXTURECACHE_H
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#define FONTTEXTURECACHE_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "vgui_surfacelib/FontManager.h"
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#include "utlrbtree.h"
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#include <vgui/ISurface.h>
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#include "utlmap.h"
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class ITexture;
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//-----------------------------------------------------------------------------
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// Purpose: manages texture memory for unicode fonts in vgui
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//-----------------------------------------------------------------------------
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class CFontTextureCache
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{
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public:
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CFontTextureCache();
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~CFontTextureCache();
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// returns a texture ID and a pointer to an array of 4 texture coords for the given character & font
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// generates+uploads more texture if necessary
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bool GetTextureForChar( vgui::HFont font, vgui::FontDrawType_t type, wchar_t wch, int *textureID, float **texCoords );
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// for each character in an array (not assumed to be a NULL-terminated string), returns a
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// texture ID and a pointer to an array of 4 texture coords for the given character & font
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// generates+uploads more texture if necessary
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bool GetTextureForChars( vgui::HFont font, vgui::FontDrawType_t type, const wchar_t *wch, int *textureID, float **texCoords, int numChars = 1 );
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// clears the cache
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void Clear();
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private:
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// NOTE: If you change this, change s_pFontPageSize
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enum
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{
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FONT_PAGE_SIZE_16,
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FONT_PAGE_SIZE_32,
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FONT_PAGE_SIZE_64,
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FONT_PAGE_SIZE_128,
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FONT_PAGE_SIZE_256,
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FONT_PAGE_SIZE_COUNT,
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};
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// a single character in the cache
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typedef unsigned short HCacheEntry;
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struct CacheEntry_t
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{
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vgui::HFont font;
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wchar_t wch;
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unsigned char page;
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float texCoords[4];
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// doubly-linked list for use in the LRU
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HCacheEntry nextEntry;
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HCacheEntry prevEntry;
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};
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// a single texture page
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struct Page_t
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{
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short textureID[vgui::FONT_DRAW_TYPE_COUNT];
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short maxFontHeight;
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short tallestCharOnLine;
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short wide, tall; // total size of the page
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short nextX, nextY; // position to draw any new character positions
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};
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// allocates a new page for a given character
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bool AllocatePageForChar(int charWide, int charTall, int &pageIndex, int &drawX, int &drawY, int &twide, int &ttall);
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// Creates font materials
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void CreateFontMaterials( Page_t &page, ITexture *pFontTexture, bool bitmapFont = false );
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// Computes the page size given a character height
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int ComputePageType( int charTall ) const;
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static bool CacheEntryLessFunc(const CacheEntry_t &lhs, const CacheEntry_t &rhs);
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CUtlRBTree<CacheEntry_t, HCacheEntry> m_CharCache;
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// cache
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typedef CUtlVector<Page_t> FontPageList_t;
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FontPageList_t m_PageList;
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int m_pCurrPage[FONT_PAGE_SIZE_COUNT];
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HCacheEntry m_LRUListHeadIndex;
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static int s_pFontPageSize[FONT_PAGE_SIZE_COUNT];
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CUtlMap< vgui::HFont, Page_t > m_FontPages;
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};
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#endif // FONTTEXTURECACHE_H
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