Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#ifndef FONTTEXTURECACHE_H
#define FONTTEXTURECACHE_H
#ifdef _WIN32
#pragma once
#endif
#include "vgui_surfacelib/FontManager.h"
#include "utlrbtree.h"
#include <vgui/ISurface.h>
#include "utlmap.h"
class ITexture;
//-----------------------------------------------------------------------------
// Purpose: manages texture memory for unicode fonts in vgui
//-----------------------------------------------------------------------------
class CFontTextureCache
{
public:
CFontTextureCache();
~CFontTextureCache();
// returns a texture ID and a pointer to an array of 4 texture coords for the given character & font
// generates+uploads more texture if necessary
bool GetTextureForChar( vgui::HFont font, vgui::FontDrawType_t type, wchar_t wch, int *textureID, float **texCoords );
// for each character in an array (not assumed to be a NULL-terminated string), returns a
// texture ID and a pointer to an array of 4 texture coords for the given character & font
// generates+uploads more texture if necessary
bool GetTextureForChars( vgui::HFont font, vgui::FontDrawType_t type, const wchar_t *wch, int *textureID, float **texCoords, int numChars = 1 );
// clears the cache
void Clear();
private:
// NOTE: If you change this, change s_pFontPageSize
enum
{
FONT_PAGE_SIZE_16,
FONT_PAGE_SIZE_32,
FONT_PAGE_SIZE_64,
FONT_PAGE_SIZE_128,
FONT_PAGE_SIZE_256,
FONT_PAGE_SIZE_COUNT,
};
// a single character in the cache
typedef unsigned short HCacheEntry;
struct CacheEntry_t
{
vgui::HFont font;
wchar_t wch;
unsigned char page;
float texCoords[4];
// doubly-linked list for use in the LRU
HCacheEntry nextEntry;
HCacheEntry prevEntry;
};
// a single texture page
struct Page_t
{
short textureID[vgui::FONT_DRAW_TYPE_COUNT];
short maxFontHeight;
short tallestCharOnLine;
short wide, tall; // total size of the page
short nextX, nextY; // position to draw any new character positions
};
// allocates a new page for a given character
bool AllocatePageForChar(int charWide, int charTall, int &pageIndex, int &drawX, int &drawY, int &twide, int &ttall);
// Creates font materials
void CreateFontMaterials( Page_t &page, ITexture *pFontTexture, bool bitmapFont = false );
// Computes the page size given a character height
int ComputePageType( int charTall ) const;
static bool CacheEntryLessFunc(const CacheEntry_t &lhs, const CacheEntry_t &rhs);
CUtlRBTree<CacheEntry_t, HCacheEntry> m_CharCache;
// cache
typedef CUtlVector<Page_t> FontPageList_t;
FontPageList_t m_PageList;
int m_pCurrPage[FONT_PAGE_SIZE_COUNT];
HCacheEntry m_LRUListHeadIndex;
static int s_pFontPageSize[FONT_PAGE_SIZE_COUNT];
CUtlMap< vgui::HFont, Page_t > m_FontPages;
};
#endif // FONTTEXTURECACHE_H