forked from KolibriOS/kolibrios
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
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/*******************************************************************
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*
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* ttraster.h v 1.4
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*
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* The FreeType glyph rasterizer.
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*
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* Copyright 1996-1999 by
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* David Turner, Robert Wilhelm, and Werner Lemberg
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*
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* This file is part of the FreeType project, and may only be used
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* modified and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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* NOTES:
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*
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* This version supports the following:
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*
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* - direct grayscaling
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* - sub-banding
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* - drop-out modes 4 and 5
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* - second pass for complete drop-out control (bitmap only)
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* - variable precision
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*
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*
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* Changes between 1.4 and 1.3:
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*
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* Mainly performance tunings:
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*
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* - Line_Down() and Bezier_Down() now use the functions Line_Up()
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* and Bezier_Up() to do their work.
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* - optimized Split_Bezier()
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* - optimized linked lists used during sweeps
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*
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* Changes between 1.2 and 1.3:
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*
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* - made the engine optionaly re-entrant. Saves a lot
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* of code for a moderate performance hit.
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*
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******************************************************************/
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#ifndef TTRASTER_H
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#define TTRASTER_H
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#include "ttconfig.h"
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#include "freetype.h" /* for TT_Outline */
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#include "ttengine.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* We provide two different builds of the scan-line converter */
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/* The static build uses global variables and isn't */
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/* re-entrant. */
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/* The indirect build is re-entrant but accesses all variables */
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/* indirectly. */
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/* */
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/* As a consequence, the indirect build is about 10% slower */
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/* than the static one on a _Pentium_ (this could get worse */
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/* on older processors), but the code size is reduced by */
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/* more than 30% ! */
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/* */
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/* The indirect build is now the default, defined in */
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/* ttconfig.h. Be careful if you experiment with this. */
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/* Note also that, though its code can be re-entrant, the */
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/* component is always used in thread-safe mode. This is */
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/* simply due to the fact that we want to use a single */
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/* render pool (of 64 Kb), and not to waste memory. */
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#ifdef TT_STATIC_RASTER
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#define RAS_ARGS /* void */
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#define RAS_ARG /* void */
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#define RAS_VARS /* void */
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#define RAS_VAR /* void */
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#else
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#define RAS_ARGS TRaster_Instance* raster,
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#define RAS_ARG TRaster_Instance* raster
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#define RAS_VARS raster,
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#define RAS_VAR raster
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#endif
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struct TRaster_Instance_;
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typedef struct TRaster_Instance_ TRaster_Instance;
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/* Render one glyph in the target bitmap, using drop-out control */
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/* mode 'scan'. */
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LOCAL_DEF
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TT_Error Render_Glyph( RAS_ARGS TT_Outline* glyph,
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TT_Raster_Map* target );
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#ifdef TT_CONFIG_OPTION_GRAY_SCALING
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/* Render one gray-level glyph in the target pixmap. */
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/* Palette points to an array of 5 colors used for the rendering. */
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/* Use NULL to reuse the last palette. Default is VGA graylevels. */
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LOCAL_DEF
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TT_Error Render_Gray_Glyph( RAS_ARGS TT_Outline* glyph,
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TT_Raster_Map* target,
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Byte* palette );
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#endif
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/* Initialize rasterizer */
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LOCAL_DEF
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TT_Error TTRaster_Init( PEngine_Instance engine );
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/* Finalize it */
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LOCAL_DEF
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TT_Error TTRaster_Done( PEngine_Instance engine );
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#ifdef __cplusplus
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}
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#endif
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#endif /* TTRASTER_H */
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/* END */
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