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| 1 | /***************************************************************************/
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| 2 | /* */
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| 3 | /* ftgasp.h */
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| 4 | /* */
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| 5 | /* Access of TrueType's `gasp' table (specification). */
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| 6 | /* */
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| 7 | /* Copyright 2007 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 | /***************************************************************************/
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| 17 | |
| 18 | |
| 19 | #ifndef _FT_GASP_H_
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| 20 | #define _FT_GASP_H_
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| 21 | |
| 22 | #include <ft2build.h> |
| 23 | #include FT_FREETYPE_H |
| 24 | |
| 25 | /***************************************************************************
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| 26 | * |
| 27 | * @section: |
| 28 | * gasp_table |
| 29 | * |
| 30 | * @title: |
| 31 | * Gasp Table |
| 32 | * |
| 33 | * @abstract: |
| 34 | * Retrieving TrueType `gasp' table entries |
| 35 | * |
| 36 | * @description: |
| 37 | * The function @FT_Get_Gasp can be used to query a TrueType or OpenType |
| 38 | * font for specific entries in their `gasp' table, if any. This is |
| 39 | * mainly useful when implementing native TrueType hinting with the |
| 40 | * bytecode interpreter to duplicate the Windows text rendering results. |
| 41 | */ |
| 42 | |
| 43 | /*************************************************************************
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| 44 | * |
| 45 | * @enum: |
| 46 | * FT_GASP_XXX |
| 47 | * |
| 48 | * @description: |
| 49 | * A list of values and/or bit-flags returned by the @FT_Get_Gasp |
| 50 | * function. |
| 51 | * |
| 52 | * @values: |
| 53 | * FT_GASP_NO_TABLE :: |
| 54 | * This special value means that there is no GASP table in this face. |
| 55 | * It is up to the client to decide what to do. |
| 56 | * |
| 57 | * FT_GASP_DO_GRIDFIT :: |
| 58 | * Grid-fitting and hinting should be performed at the specified ppem. |
| 59 | * This *really* means TrueType bytecode interpretation. |
| 60 | * |
| 61 | * FT_GASP_DO_GRAY :: |
| 62 | * Anti-aliased rendering should be performed at the specified ppem. |
| 63 | * |
| 64 | * FT_GASP_SYMMETRIC_SMOOTHING :: |
| 65 | * Smoothing along multiple axes must be used with ClearType. |
| 66 | * |
| 67 | * FT_GASP_SYMMETRIC_GRIDFIT :: |
| 68 | * Grid-fitting must be used with ClearType's symmetric smoothing. |
| 69 | * |
| 70 | * @note: |
| 71 | * `ClearType' is Microsoft's implementation of LCD rendering, partly |
| 72 | * protected by patents. |
| 73 | * |
| 74 | * @since: |
| 75 | * 2.3.0 |
| 76 | */ |
| 77 | #define FT_GASP_NO_TABLE -1 |
| 78 | #define FT_GASP_DO_GRIDFIT 0x01 |
| 79 | #define FT_GASP_DO_GRAY 0x02 |
| 80 | #define FT_GASP_SYMMETRIC_SMOOTHING 0x08 |
| 81 | #define FT_GASP_SYMMETRIC_GRIDFIT 0x10 |
| 82 | |
| 83 | |
| 84 | /*************************************************************************
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| 85 | * |
| 86 | * @func: |
| 87 | * FT_Get_Gasp |
| 88 | * |
| 89 | * @description: |
| 90 | * Read the `gasp' table from a TrueType or OpenType font file and |
| 91 | * return the entry corresponding to a given character pixel size. |
| 92 | * |
| 93 | * @input: |
| 94 | * face :: The source face handle. |
| 95 | * ppem :: The vertical character pixel size. |
| 96 | * |
| 97 | * @return: |
| 98 | * Bit flags (see @FT_GASP_XXX), or @FT_GASP_NO_TABLE is there is no |
| 99 | * `gasp' table in the face. |
| 100 | * |
| 101 | * @since: |
| 102 | * 2.3.0 |
| 103 | */ |
| 104 | FT_EXPORT( FT_Int ) |
| 105 | FT_Get_Gasp( FT_Face face, |
| 106 | FT_UInt ppem ); |
| 107 | |
| 108 | /* */
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| 109 | |
| 110 | #endif /* _FT_GASP_H_ */ |
| 111 | |
| 112 | |
| 113 | /* END */
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