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