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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /******************************************************************* |
| 2 | * |
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| 3 | * ttraster.h v 1.4 |
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| 4 | * |
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| 5 | * The FreeType glyph rasterizer. |
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| 6 | * |
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| 7 | * Copyright 1996-1999 by |
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| 8 | * David Turner, Robert Wilhelm, and Werner Lemberg |
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| 9 | * |
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| 10 | * This file is part of the FreeType project, and may only be used |
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| 11 | * modified and distributed under the terms of the FreeType project |
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| 12 | * license, LICENSE.TXT. By continuing to use, modify, or distribute |
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| 13 | * this file you indicate that you have read the license and |
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| 14 | * understand and accept it fully. |
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| 15 | * |
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| 16 | * NOTES: |
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| 17 | * |
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| 18 | * This version supports the following: |
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| 19 | * |
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| 20 | * - direct grayscaling |
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| 21 | * - sub-banding |
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| 22 | * - drop-out modes 4 and 5 |
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| 23 | * - second pass for complete drop-out control (bitmap only) |
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| 24 | * - variable precision |
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| 25 | * |
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| 26 | * |
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| 27 | * Changes between 1.4 and 1.3: |
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| 28 | * |
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| 29 | * Mainly performance tunings: |
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| 30 | * |
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| 31 | * - Line_Down() and Bezier_Down() now use the functions Line_Up() |
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| 32 | * and Bezier_Up() to do their work. |
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| 33 | * - optimized Split_Bezier() |
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| 34 | * - optimized linked lists used during sweeps |
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| 35 | * |
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| 36 | * Changes between 1.2 and 1.3: |
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| 37 | * |
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| 38 | * - made the engine optionaly re-entrant. Saves a lot |
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| 39 | * of code for a moderate performance hit. |
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| 40 | * |
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| 41 | ******************************************************************/ |
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| 42 | |||
| 43 | #ifndef TTRASTER_H |
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| 44 | #define TTRASTER_H |
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| 45 | |||
| 46 | #include "ttconfig.h" |
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| 47 | #include "freetype.h" /* for TT_Outline */ |
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| 48 | #include "ttengine.h" |
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| 49 | |||
| 50 | #ifdef __cplusplus |
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| 51 | extern "C" { |
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| 52 | #endif |
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| 53 | |||
| 54 | /* We provide two different builds of the scan-line converter */ |
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| 55 | /* The static build uses global variables and isn't */ |
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| 56 | /* re-entrant. */ |
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| 57 | /* The indirect build is re-entrant but accesses all variables */ |
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| 58 | /* indirectly. */ |
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| 59 | /* */ |
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| 60 | /* As a consequence, the indirect build is about 10% slower */ |
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| 61 | /* than the static one on a _Pentium_ (this could get worse */ |
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| 62 | /* on older processors), but the code size is reduced by */ |
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| 63 | /* more than 30% ! */ |
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| 64 | /* */ |
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| 65 | /* The indirect build is now the default, defined in */ |
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| 66 | /* ttconfig.h. Be careful if you experiment with this. */ |
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| 67 | |||
| 68 | /* Note also that, though its code can be re-entrant, the */ |
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| 69 | /* component is always used in thread-safe mode. This is */ |
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| 70 | /* simply due to the fact that we want to use a single */ |
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| 71 | /* render pool (of 64 Kb), and not to waste memory. */ |
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| 72 | |||
| 73 | #ifdef TT_STATIC_RASTER |
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| 74 | |||
| 75 | #define RAS_ARGS /* void */ |
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| 76 | #define RAS_ARG /* void */ |
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| 77 | |||
| 78 | #define RAS_VARS /* void */ |
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| 79 | #define RAS_VAR /* void */ |
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| 80 | |||
| 81 | #else |
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| 82 | |||
| 83 | #define RAS_ARGS TRaster_Instance* raster, |
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| 84 | #define RAS_ARG TRaster_Instance* raster |
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| 85 | |||
| 86 | #define RAS_VARS raster, |
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| 87 | #define RAS_VAR raster |
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| 88 | |||
| 89 | #endif |
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| 90 | |||
| 91 | |||
| 92 | struct TRaster_Instance_; |
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| 93 | typedef struct TRaster_Instance_ TRaster_Instance; |
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| 94 | |||
| 95 | /* Render one glyph in the target bitmap, using drop-out control */ |
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| 96 | /* mode 'scan'. */ |
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| 97 | LOCAL_DEF |
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| 98 | TT_Error Render_Glyph( RAS_ARGS TT_Outline* glyph, |
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| 99 | TT_Raster_Map* target ); |
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| 100 | |||
| 101 | #ifdef TT_CONFIG_OPTION_GRAY_SCALING |
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| 102 | /* Render one gray-level glyph in the target pixmap. */ |
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| 103 | /* Palette points to an array of 5 colors used for the rendering. */ |
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| 104 | /* Use NULL to reuse the last palette. Default is VGA graylevels. */ |
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| 105 | LOCAL_DEF |
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| 106 | TT_Error Render_Gray_Glyph( RAS_ARGS TT_Outline* glyph, |
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| 107 | TT_Raster_Map* target, |
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| 108 | Byte* palette ); |
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| 109 | #endif |
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| 110 | |||
| 111 | /* Initialize rasterizer */ |
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| 112 | LOCAL_DEF |
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| 113 | TT_Error TTRaster_Init( PEngine_Instance engine ); |
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| 114 | |||
| 115 | /* Finalize it */ |
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| 116 | LOCAL_DEF |
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| 117 | TT_Error TTRaster_Done( PEngine_Instance engine ); |
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| 118 | |||
| 119 | |||
| 120 | #ifdef __cplusplus |
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| 121 | } |
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| 122 | #endif |
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| 123 | |||
| 124 | #endif /* TTRASTER_H */ |
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| 125 | |||
| 126 | |||
| 127 | /* END */ |