Stephan Aßmus
fb2c7f9394
Reworked the glyph caching: * It is now glyph index based (a font file has an internal glyph code to index mapping, so that for example the same fallback glyph is used for all unsupported codes). * We do not truncate to uint16 anymore at various places, but support the full 32 bit char codes. * This made it necessary to switch to an OpenHashTable based cache lookup. * In CharacterMap, you can now see that the second Unicode plane does not wrap around anymore. TODO: Remove old entries from the hash table after a while to free up memory. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31780 a95241bf-73f2-0310-859d-f6bbb57e9c96
164 lines
4.6 KiB
C++
164 lines
4.6 KiB
C++
/*
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* Copyright 2007, Haiku. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Maxim Shemanarev <[email protected]>
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* Stephan Aßmus <[email protected]>
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* Andrej Spielmann, <[email protected]>
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*/
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//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: [email protected]
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// [email protected]
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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#ifndef FONT_ENGINE_H
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#define FONT_ENGINE_H
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#include <SupportDefs.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include <agg_scanline_storage_aa.h>
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#include <agg_scanline_storage_bin.h>
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#include <agg_scanline_u.h>
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#include <agg_scanline_bin.h>
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#include <agg_path_storage_integer.h>
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#include <agg_rasterizer_scanline_aa.h>
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#include <agg_conv_curve.h>
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#include <agg_trans_affine.h>
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#include "agg_scanline_storage_subpix.h"
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#include "agg_scanline_u_subpix.h"
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#include "agg_scanline_u_subpix_avrg_filtering.h"
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#include "GlobalSubpixelSettings.h"
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enum glyph_rendering {
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glyph_ren_native_mono,
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glyph_ren_native_gray8,
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glyph_ren_outline,
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glyph_ren_subpix
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};
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enum glyph_data_type {
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glyph_data_invalid = 0,
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glyph_data_mono = 1,
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glyph_data_gray8 = 2,
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glyph_data_outline = 3,
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glyph_data_subpix = 4
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};
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class FontEngine {
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public:
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typedef agg::serialized_scanlines_adaptor_subpix<uint8> SubpixAdapter;
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typedef agg::serialized_scanlines_adaptor_aa<uint8> Gray8Adapter;
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typedef agg::serialized_scanlines_adaptor_bin MonoAdapter;
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typedef agg::scanline_storage_aa8 ScanlineStorageAA;
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typedef agg::scanline_storage_subpix8 ScanlineStorageSubpix;
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typedef agg::scanline_storage_bin ScanlineStorageBin;
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typedef agg::serialized_integer_path_adaptor<int32, 6> PathAdapter;
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FontEngine();
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virtual ~FontEngine();
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bool Init(const char* fontFilePath,
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unsigned face_index, double size,
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FT_Encoding char_map,
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glyph_rendering ren_type,
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bool hinting,
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const char* fontFileBuffer = NULL,
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const long fontFileBufferSize = 0);
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int LastError() const
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{ return fLastError; }
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unsigned CountFaces() const;
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bool Hinting() const
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{ return fHinting; }
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uint32 GlyphIndexForGlyphCode(uint32 glyphCode) const;
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bool PrepareGlyph(uint32 glyphIndex);
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uint32 DataSize() const
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{ return fDataSize; }
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glyph_data_type DataType() const
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{ return fDataType; }
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const agg::rect_i& Bounds() const
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{ return fBounds; }
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double AdvanceX() const
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{ return fAdvanceX; }
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double AdvanceY() const
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{ return fAdvanceY; }
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double InsetLeft() const
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{ return fInsetLeft; }
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double InsetRight() const
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{ return fInsetRight; }
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void WriteGlyphTo(uint8* data) const;
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bool GetKerning(uint32 first, uint32 second,
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double* x, double* y);
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private:
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// disallowed stuff:
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FontEngine(const FontEngine&);
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const FontEngine& operator=(const FontEngine&);
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int fLastError;
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bool fLibraryInitialized;
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FT_Library fLibrary; // handle to library
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FT_Face fFace; // FreeType font face handle
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glyph_rendering fGlyphRendering;
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bool fHinting;
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// members needed to generate individual glyphs according
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// to glyph rendering type
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uint32 fDataSize;
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glyph_data_type fDataType;
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agg::rect_i fBounds;
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double fAdvanceX;
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double fAdvanceY;
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double fInsetLeft;
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double fInsetRight;
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// these members are for caching memory allocations
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// when rendering glyphs
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typedef agg::path_storage_integer<int32, 6> PathStorageType;
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typedef agg::conv_curve<PathStorageType> CurveConverterType;
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PathStorageType fPath;
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CurveConverterType fCurves;
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agg::scanline_u8 fScanlineAA;
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agg::scanline_bin fScanlineBin;
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#ifdef AVERAGE_BASED_SUBPIXEL_FILTERING
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agg::scanline_u8_subpix_avrg_filtering fScanlineSubpix;
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#else
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agg::scanline_u8_subpix fScanlineSubpix;
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#endif
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ScanlineStorageAA fScanlineStorageAA;
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ScanlineStorageBin fScanlineStorageBin;
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ScanlineStorageSubpix fScanlineStorageSubpix;
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};
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#endif // FONT_ENGINE_H
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