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5496 | leency | 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 */ |