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1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 ``` ``````/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** \$QT_BEGIN_LICENSE:LGPL\$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** \$QT_END_LICENSE\$ ** ****************************************************************************/ /***************************************************************************/ /* */ /* ftimage.h */ /* */ /* FreeType glyph image formats and default raster interface */ /* (specification). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004 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. */ /* */ /***************************************************************************/ /*************************************************************************/ /* */ /* Note: A `raster' is simply a scan-line converter, used to render */ /* QT_FT_Outlines into QT_FT_Bitmaps. */ /* */ /*************************************************************************/ #ifndef __QT_FTIMAGE_H__ #define __QT_FTIMAGE_H__ /* // W A R N I N G // ------------- // // This file is not part of the Qt API. It exists purely as an // implementation detail. This header file may change from version to // version without notice, or even be removed. // // We mean it. */ QT_FT_BEGIN_HEADER /*************************************************************************/ /* */ /*
*/ /* basic_types */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* QT_FT_Pos */ /* */ /* */ /* The type QT_FT_Pos is a 32-bit integer used to store vectorial */ /* coordinates. Depending on the context, these can represent */ /* distances in integer font units, or 16,16, or 26.6 fixed float */ /* pixel coordinates. */ /* */ typedef signed int QT_FT_Pos; /*************************************************************************/ /* */ /* */ /* QT_FT_Vector */ /* */ /* */ /* A simple structure used to store a 2D vector; coordinates are of */ /* the QT_FT_Pos type. */ /* */ /* */ /* x :: The horizontal coordinate. */ /* y :: The vertical coordinate. */ /* */ typedef struct QT_FT_Vector_ { QT_FT_Pos x; QT_FT_Pos y; } QT_FT_Vector; /*************************************************************************/ /* */ /* */ /* QT_FT_BBox */ /* */ /* */ /* A structure used to hold an outline's bounding box, i.e., the */ /* coordinates of its extrema in the horizontal and vertical */ /* directions. */ /* */ /* */ /* xMin :: The horizontal minimum (left-most). */ /* */ /* yMin :: The vertical minimum (bottom-most). */ /* */ /* xMax :: The horizontal maximum (right-most). */ /* */ /* yMax :: The vertical maximum (top-most). */ /* */ typedef struct QT_FT_BBox_ { QT_FT_Pos xMin, yMin; QT_FT_Pos xMax, yMax; } QT_FT_BBox; /*************************************************************************/ /* */ /* */ /* QT_FT_Pixel_Mode */ /* */ /* */ /* An enumeration type used to describe the format of pixels in a */ /* given bitmap. Note that additional formats may be added in the */ /* future. */ /* */ /* */ /* QT_FT_PIXEL_MODE_NONE :: */ /* Value 0 is reserved. */ /* */ /* QT_FT_PIXEL_MODE_MONO :: */ /* A monochrome bitmap, using 1 bit per pixel. Note that pixels */ /* are stored in most-significant order (MSB), which means that */ /* the left-most pixel in a byte has value 128. */ /* */ /* QT_FT_PIXEL_MODE_GRAY :: */ /* An 8-bit bitmap, generally used to represent anti-aliased glyph */ /* images. Each pixel is stored in one byte. Note that the number */ /* of value "gray" levels is stored in the `num_bytes' field of */ /* the @QT_FT_Bitmap structure (it generally is 256). */ /* */ /* QT_FT_PIXEL_MODE_GRAY2 :: */ /* A 2-bit/pixel bitmap, used to represent embedded anti-aliased */ /* bitmaps in font files according to the OpenType specification. */ /* We haven't found a single font using this format, however. */ /* */ /* QT_FT_PIXEL_MODE_GRAY4 :: */ /* A 4-bit/pixel bitmap, used to represent embedded anti-aliased */ /* bitmaps in font files according to the OpenType specification. */ /* We haven't found a single font using this format, however. */ /* */ /* QT_FT_PIXEL_MODE_LCD :: */ /* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */ /* images used for display on LCD displays; the bitmap's width is */ /* three times wider than the original glyph image. See also */ /* @QT_FT_RENDER_MODE_LCD. */ /* */ /* QT_FT_PIXEL_MODE_LCD_V :: */ /* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */ /* images used for display on rotated LCD displays; the bitmap's */ /* height is three times taller than the original glyph image. */ /* See also @QT_FT_RENDER_MODE_LCD_V. */ /* */ typedef enum QT_FT_Pixel_Mode_ { QT_FT_PIXEL_MODE_NONE = 0, QT_FT_PIXEL_MODE_MONO, QT_FT_PIXEL_MODE_GRAY, QT_FT_PIXEL_MODE_GRAY2, QT_FT_PIXEL_MODE_GRAY4, QT_FT_PIXEL_MODE_LCD, QT_FT_PIXEL_MODE_LCD_V, QT_FT_PIXEL_MODE_MAX /* do not remove */ } QT_FT_Pixel_Mode; /*************************************************************************/ /* */ /* */ /* qt_ft_pixel_mode_xxx */ /* */ /* */ /* A list of deprecated constants. Use the corresponding */ /* @QT_FT_Pixel_Mode values instead. */ /* */ /* */ /* qt_ft_pixel_mode_none :: see @QT_FT_PIXEL_MODE_NONE */ /* qt_ft_pixel_mode_mono :: see @QT_FT_PIXEL_MODE_MONO */ /* qt_ft_pixel_mode_grays :: see @QT_FT_PIXEL_MODE_GRAY */ /* qt_ft_pixel_mode_pal2 :: see @QT_FT_PIXEL_MODE_GRAY2 */ /* qt_ft_pixel_mode_pal4 :: see @QT_FT_PIXEL_MODE_GRAY4 */ /* */ #define qt_ft_pixel_mode_none QT_FT_PIXEL_MODE_NONE #define qt_ft_pixel_mode_mono QT_FT_PIXEL_MODE_MONO #define qt_ft_pixel_mode_grays QT_FT_PIXEL_MODE_GRAY #define qt_ft_pixel_mode_pal2 QT_FT_PIXEL_MODE_GRAY2 #define qt_ft_pixel_mode_pal4 QT_FT_PIXEL_MODE_GRAY4 /* */ #if 0 /*************************************************************************/ /* */ /* */ /* QT_FT_Palette_Mode */ /* */ /* */ /* THIS TYPE IS DEPRECATED. DO NOT USE IT! */ /* */ /* An enumeration type used to describe the format of a bitmap */ /* palette, used with qt_ft_pixel_mode_pal4 and qt_ft_pixel_mode_pal8. */ /* */ /* */ /* qt_ft_palette_mode_rgb :: The palette is an array of 3-bytes RGB */ /* records. */ /* */ /* qt_ft_palette_mode_rgba :: The palette is an array of 4-bytes RGBA */ /* records. */ /* */ /* */ /* As qt_ft_pixel_mode_pal2, pal4 and pal8 are currently unused by */ /* FreeType, these types are not handled by the library itself. */ /* */ typedef enum QT_FT_Palette_Mode_ { qt_ft_palette_mode_rgb = 0, qt_ft_palette_mode_rgba, qt_ft_palettte_mode_max /* do not remove */ } QT_FT_Palette_Mode; /* */ #endif /*************************************************************************/ /* */ /* */ /* QT_FT_Bitmap */ /* */ /* */ /* A structure used to describe a bitmap or pixmap to the raster. */ /* Note that we now manage pixmaps of various depths through the */ /* `pixel_mode' field. */ /* */ /* */ /* rows :: The number of bitmap rows. */ /* */ /* width :: The number of pixels in bitmap row. */ /* */ /* pitch :: The pitch's absolute value is the number of bytes */ /* taken by one bitmap row, including padding. */ /* However, the pitch is positive when the bitmap has */ /* a `down' flow, and negative when it has an `up' */ /* flow. In all cases, the pitch is an offset to add */ /* to a bitmap pointer in order to go down one row. */ /* */ /* buffer :: A typeless pointer to the bitmap buffer. This */ /* value should be aligned on 32-bit boundaries in */ /* most cases. */ /* */ /* num_grays :: This field is only used with */ /* `QT_FT_PIXEL_MODE_GRAY'; it gives the number of gray */ /* levels used in the bitmap. */ /* */ /* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */ /* See @QT_FT_Pixel_Mode for possible values. */ /* */ /* palette_mode :: This field is only used with paletted pixel modes; */ /* it indicates how the palette is stored. */ /* */ /* palette :: A typeless pointer to the bitmap palette; only */ /* used for paletted pixel modes. */ /* */ /* */ /* For now, the only pixel mode supported by FreeType are mono and */ /* grays. However, drivers might be added in the future to support */ /* more `colorful' options. */ /* */ /* When using pixel modes pal2, pal4 and pal8 with a void `palette' */ /* field, a gray pixmap with respectively 4, 16, and 256 levels of */ /* gray is assumed. This, in order to be compatible with some */ /* embedded bitmap formats defined in the TrueType specification. */ /* */ /* Note that no font was found presenting such embedded bitmaps, so */ /* this is currently completely unhandled by the library. */ /* */ typedef struct QT_FT_Bitmap_ { int rows; int width; int pitch; unsigned char* buffer; short num_grays; char pixel_mode; char palette_mode; void* palette; } QT_FT_Bitmap; /*************************************************************************/ /* */ /*
*/ /* outline_processing */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* QT_FT_Outline */ /* */ /* */ /* This structure is used to describe an outline to the scan-line */ /* converter. */ /* */ /* */ /* n_contours :: The number of contours in the outline. */ /* */ /* n_points :: The number of points in the outline. */ /* */ /* points :: A pointer to an array of `n_points' QT_FT_Vector */ /* elements, giving the outline's point coordinates. */ /* */ /* tags :: A pointer to an array of `n_points' chars, giving */ /* each outline point's type. If bit 0 is unset, the */ /* point is `off' the curve, i.e. a Bezier control */ /* point, while it is `on' when set. */ /* */ /* Bit 1 is meaningful for `off' points only. If set, */ /* it indicates a third-order Bezier arc control point; */ /* and a second-order control point if unset. */ /* */ /* contours :: An array of `n_contours' shorts, giving the end */ /* point of each contour within the outline. For */ /* example, the first contour is defined by the points */ /* `0' to `contours[0]', the second one is defined by */ /* the points `contours[0]+1' to `contours[1]', etc. */ /* */ /* flags :: A set of bit flags used to characterize the outline */ /* and give hints to the scan-converter and hinter on */ /* how to convert/grid-fit it. See QT_FT_Outline_Flags. */ /* */ typedef struct QT_FT_Outline_ { int n_contours; /* number of contours in glyph */ int n_points; /* number of points in the glyph */ QT_FT_Vector* points; /* the outline's points */ char* tags; /* the points flags */ int* contours; /* the contour end points */ int flags; /* outline masks */ } QT_FT_Outline; /*************************************************************************/ /* */ /* */ /* QT_FT_OUTLINE_FLAGS */ /* */ /* */ /* A list of bit-field constants use for the flags in an outline's */ /* `flags' field. */ /* */ /* */ /* QT_FT_OUTLINE_NONE :: Value 0 is reserved. */ /* */ /* QT_FT_OUTLINE_OWNER :: If set, this flag indicates that the */ /* outline's field arrays (i.e. */ /* `points', `flags' & `contours') are */ /* `owned' by the outline object, and */ /* should thus be freed when it is */ /* destroyed. */ /* */ /* QT_FT_OUTLINE_EVEN_ODD_FILL :: By default, outlines are filled using */ /* the non-zero winding rule. If set to */ /* 1, the outline will be filled using */ /* the even-odd fill rule (only works */ /* with the smooth raster). */ /* */ /* QT_FT_OUTLINE_REVERSE_FILL :: By default, outside contours of an */ /* outline are oriented in clock-wise */ /* direction, as defined in the TrueType */ /* specification. This flag is set if */ /* the outline uses the opposite */ /* direction (typically for Type 1 */ /* fonts). This flag is ignored by the */ /* scan-converter. However, it is very */ /* important for the auto-hinter. */ /* */ /* QT_FT_OUTLINE_IGNORE_DROPOUTS :: By default, the scan converter will */ /* try to detect drop-outs in an outline */ /* and correct the glyph bitmap to */ /* ensure consistent shape continuity. */ /* If set, this flag hints the scan-line */ /* converter to ignore such cases. */ /* */ /* QT_FT_OUTLINE_HIGH_PRECISION :: This flag indicates that the */ /* scan-line converter should try to */ /* convert this outline to bitmaps with */ /* the highest possible quality. It is */ /* typically set for small character */ /* sizes. Note that this is only a */ /* hint, that might be completely */ /* ignored by a given scan-converter. */ /* */ /* QT_FT_OUTLINE_SINGLE_PASS :: This flag is set to force a given */ /* scan-converter to only use a single */ /* pass over the outline to render a */ /* bitmap glyph image. Normally, it is */ /* set for very large character sizes. */ /* It is only a hint, that might be */ /* completely ignored by a given */ /* scan-converter. */ /* */ #define QT_FT_OUTLINE_NONE 0x0 #define QT_FT_OUTLINE_OWNER 0x1 #define QT_FT_OUTLINE_EVEN_ODD_FILL 0x2 #define QT_FT_OUTLINE_REVERSE_FILL 0x4 #define QT_FT_OUTLINE_IGNORE_DROPOUTS 0x8 #define QT_FT_OUTLINE_HIGH_PRECISION 0x100 #define QT_FT_OUTLINE_SINGLE_PASS 0x200 /************************************************************************* * * @enum: * qt_ft_outline_flags * * @description: * These constants are deprecated. Please use the corresponding * @QT_FT_OUTLINE_FLAGS values. * * @values: * qt_ft_outline_none :: See @QT_FT_OUTLINE_NONE. * qt_ft_outline_owner :: See @QT_FT_OUTLINE_OWNER. * qt_ft_outline_even_odd_fill :: See @QT_FT_OUTLINE_EVEN_ODD_FILL. * qt_ft_outline_reverse_fill :: See @QT_FT_OUTLINE_REVERSE_FILL. * qt_ft_outline_ignore_dropouts :: See @QT_FT_OUTLINE_IGNORE_DROPOUTS. * qt_ft_outline_high_precision :: See @QT_FT_OUTLINE_HIGH_PRECISION. * qt_ft_outline_single_pass :: See @QT_FT_OUTLINE_SINGLE_PASS. */ #define qt_ft_outline_none QT_FT_OUTLINE_NONE #define qt_ft_outline_owner QT_FT_OUTLINE_OWNER #define qt_ft_outline_even_odd_fill QT_FT_OUTLINE_EVEN_ODD_FILL #define qt_ft_outline_reverse_fill QT_FT_OUTLINE_REVERSE_FILL #define qt_ft_outline_ignore_dropouts QT_FT_OUTLINE_IGNORE_DROPOUTS #define qt_ft_outline_high_precision QT_FT_OUTLINE_HIGH_PRECISION #define qt_ft_outline_single_pass QT_FT_OUTLINE_SINGLE_PASS /* */ #define QT_FT_CURVE_TAG( flag ) ( flag & 3 ) #define QT_FT_CURVE_TAG_ON 1 #define QT_FT_CURVE_TAG_CONIC 0 #define QT_FT_CURVE_TAG_CUBIC 2 #define QT_FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ #define QT_FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ #define QT_FT_CURVE_TAG_TOUCH_BOTH ( QT_FT_CURVE_TAG_TOUCH_X | \ QT_FT_CURVE_TAG_TOUCH_Y ) #define QT_FT_Curve_Tag_On QT_FT_CURVE_TAG_ON #define QT_FT_Curve_Tag_Conic QT_FT_CURVE_TAG_CONIC #define QT_FT_Curve_Tag_Cubic QT_FT_CURVE_TAG_CUBIC #define QT_FT_Curve_Tag_Touch_X QT_FT_CURVE_TAG_TOUCH_X #define QT_FT_Curve_Tag_Touch_Y QT_FT_CURVE_TAG_TOUCH_Y /*************************************************************************/ /* */ /* */ /* QT_FT_Outline_MoveToFunc */ /* */ /* */ /* A function pointer type used to describe the signature of a `move */ /* to' function during outline walking/decomposition. */ /* */ /* A `move to' is emitted to start a new contour in an outline. */ /* */ /* */ /* to :: A pointer to the target point of the `move to'. */ /* */ /* user :: A typeless pointer which is passed from the caller of the */ /* decomposition function. */ /* */ /* */ /* Error code. 0 means success. */ /* */ typedef int (*QT_FT_Outline_MoveToFunc)( QT_FT_Vector* to, void* user ); #define QT_FT_Outline_MoveTo_Func QT_FT_Outline_MoveToFunc /*************************************************************************/ /* */ /* */ /* QT_FT_Outline_LineToFunc */ /* */ /* */ /* A function pointer type used to describe the signature of a `line */ /* to' function during outline walking/decomposition. */ /* */ /* A `line to' is emitted to indicate a segment in the outline. */ /* */ /* */ /* to :: A pointer to the target point of the `line to'. */ /* */ /* user :: A typeless pointer which is passed from the caller of the */ /* decomposition function. */ /* */ /* */ /* Error code. 0 means success. */ /* */ typedef int (*QT_FT_Outline_LineToFunc)( QT_FT_Vector* to, void* user ); #define QT_FT_Outline_LineTo_Func QT_FT_Outline_LineToFunc /*************************************************************************/ /* */ /* */ /* QT_FT_Outline_ConicToFunc */ /* */ /* */ /* A function pointer type use to describe the signature of a `conic */ /* to' function during outline walking/decomposition. */ /* */ /* A `conic to' is emitted to indicate a second-order Bezier arc in */ /* the outline. */ /* */ /* */ /* control :: An intermediate control point between the last position */ /* and the new target in `to'. */ /* */ /* to :: A pointer to the target end point of the conic arc. */ /* */ /* user :: A typeless pointer which is passed from the caller of */ /* the decomposition function. */ /* */ /* */ /* Error code. 0 means success. */ /* */ typedef int (*QT_FT_Outline_ConicToFunc)( QT_FT_Vector* control, QT_FT_Vector* to, void* user ); #define QT_FT_Outline_ConicTo_Func QT_FT_Outline_ConicToFunc /*************************************************************************/ /* */ /* */ /* QT_FT_Outline_CubicToFunc */ /* */ /* */ /* A function pointer type used to describe the signature of a `cubic */ /* to' function during outline walking/decomposition. */ /* */ /* A `cubic to' is emitted to indicate a third-order Bezier arc. */ /* */ /* */ /* control1 :: A pointer to the first Bezier control point. */ /* */ /* control2 :: A pointer to the second Bezier control point. */ /* */ /* to :: A pointer to the target end point. */ /* */ /* user :: A typeless pointer which is passed from the caller of */ /* the decomposition function. */ /* */ /* */ /* Error code. 0 means success. */ /* */ typedef int (*QT_FT_Outline_CubicToFunc)( QT_FT_Vector* control1, QT_FT_Vector* control2, QT_FT_Vector* to, void* user ); #define QT_FT_Outline_CubicTo_Func QT_FT_Outline_CubicToFunc /*************************************************************************/ /* */ /* */ /* QT_FT_Outline_Funcs */ /* */ /* */ /* A structure to hold various function pointers used during outline */ /* decomposition in order to emit segments, conic, and cubic Beziers, */ /* as well as `move to' and `close to' operations. */ /* */ /* */ /* move_to :: The `move to' emitter. */ /* */ /* line_to :: The segment emitter. */ /* */ /* conic_to :: The second-order Bezier arc emitter. */ /* */ /* cubic_to :: The third-order Bezier arc emitter. */ /* */ /* shift :: The shift that is applied to coordinates before they */ /* are sent to the emitter. */ /* */ /* delta :: The delta that is applied to coordinates before they */ /* are sent to the emitter, but after the shift. */ /* */ /* */ /* The point coordinates sent to the emitters are the transformed */ /* version of the original coordinates (this is important for high */ /* accuracy during scan-conversion). The transformation is simple: */ /* */ /* x' = (x << shift) - delta */ /* y' = (x << shift) - delta */ /* */ /* Set the value of `shift' and `delta' to 0 to get the original */ /* point coordinates. */ /* */ typedef struct QT_FT_Outline_Funcs_ { QT_FT_Outline_MoveToFunc move_to; QT_FT_Outline_LineToFunc line_to; QT_FT_Outline_ConicToFunc conic_to; QT_FT_Outline_CubicToFunc cubic_to; int shift; QT_FT_Pos delta; } QT_FT_Outline_Funcs; /*************************************************************************/ /* */ /*
*/ /* basic_types */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* QT_FT_IMAGE_TAG */ /* */ /* */ /* This macro converts four letter tags into an unsigned long. */ /* */ /* */ /* Since many 16bit compilers don't like 32bit enumerations, you */ /* should redefine this macro in case of problems to something like */ /* this: */ /* */ /* #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */ /* */ /* to get a simple enumeration without assigning special numbers. */ /* */ #ifndef QT_FT_IMAGE_TAG #define QT_FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \ value = ( ( (unsigned long)_x1 << 24 ) | \ ( (unsigned long)_x2 << 16 ) | \ ( (unsigned long)_x3 << 8 ) | \ (unsigned long)_x4 ) #endif /* QT_FT_IMAGE_TAG */ /*************************************************************************/ /* */ /* */ /* QT_FT_Glyph_Format */ /* */ /* */ /* An enumeration type used to describe the format of a given glyph */ /* image. Note that this version of FreeType only supports two image */ /* formats, even though future font drivers will be able to register */ /* their own format. */ /* */ /* */ /* QT_FT_GLYPH_FORMAT_NONE :: */ /* The value 0 is reserved and does describe a glyph format. */ /* */ /* QT_FT_GLYPH_FORMAT_COMPOSITE :: */ /* The glyph image is a composite of several other images. This */ /* format is _only_ used with @QT_FT_LOAD_NO_RECURSE, and is used to */ /* report compound glyphs (like accented characters). */ /* */ /* QT_FT_GLYPH_FORMAT_BITMAP :: */ /* The glyph image is a bitmap, and can be described as an */ /* @QT_FT_Bitmap. You generally need to access the `bitmap' field of */ /* the @QT_FT_GlyphSlotRec structure to read it. */ /* */ /* QT_FT_GLYPH_FORMAT_OUTLINE :: */ /* The glyph image is a vertorial outline made of line segments */ /* and Bezier arcs; it can be described as an @QT_FT_Outline; you */ /* generally want to access the `outline' field of the */ /* @QT_FT_GlyphSlotRec structure to read it. */ /* */ /* QT_FT_GLYPH_FORMAT_PLOTTER :: */ /* The glyph image is a vectorial path with no inside/outside */ /* contours. Some Type 1 fonts, like those in the Hershey family, */ /* contain glyphs in this format. These are described as */ /* @QT_FT_Outline, but FreeType isn't currently capable of rendering */ /* them correctly. */ /* */ typedef enum QT_FT_Glyph_Format_ { QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ), QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ), QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ), QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ), QT_FT_IMAGE_TAG( QT_FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' ) } QT_FT_Glyph_Format; /*************************************************************************/ /* */ /* */ /* qt_ft_glyph_format_xxx */ /* */ /* */ /* A list of decprecated constants. Use the corresponding */ /* @QT_FT_Glyph_Format values instead. */ /* */ /* */ /* qt_ft_glyph_format_none :: see @QT_FT_GLYPH_FORMAT_NONE */ /* qt_ft_glyph_format_composite :: see @QT_FT_GLYPH_FORMAT_COMPOSITE */ /* qt_ft_glyph_format_bitmap :: see @QT_FT_GLYPH_FORMAT_BITMAP */ /* qt_ft_glyph_format_outline :: see @QT_FT_GLYPH_FORMAT_OUTLINE */ /* qt_ft_glyph_format_plotter :: see @QT_FT_GLYPH_FORMAT_PLOTTER */ /* */ #define qt_ft_glyph_format_none QT_FT_GLYPH_FORMAT_NONE #define qt_ft_glyph_format_composite QT_FT_GLYPH_FORMAT_COMPOSITE #define qt_ft_glyph_format_bitmap QT_FT_GLYPH_FORMAT_BITMAP #define qt_ft_glyph_format_outline QT_FT_GLYPH_FORMAT_OUTLINE #define qt_ft_glyph_format_plotter QT_FT_GLYPH_FORMAT_PLOTTER /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** R A S T E R D E F I N I T I O N S *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* A raster is a scan converter, in charge of rendering an outline into */ /* a a bitmap. This section contains the public API for rasters. */ /* */ /* Note that in FreeType 2, all rasters are now encapsulated within */ /* specific modules called `renderers'. See `freetype/ftrender.h' for */ /* more details on renderers. */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /*
*/ /* raster */ /* */ /* */ /* Scanline converter */ /* */ /* <Abstract> */ /* How vectorial outlines are converted into bitmaps and pixmaps. */ /* */ /* <Description> */ /* This section contains technical definitions. */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Type> */ /* QT_FT_Raster */ /* */ /* <Description> */ /* A handle (pointer) to a raster object. Each object can be used */ /* independently to convert an outline into a bitmap or pixmap. */ /* */ typedef struct TRaster_ *QT_FT_Raster; /*************************************************************************/ /* */ /* <Struct> */ /* QT_FT_Span */ /* */ /* <Description> */ /* A structure used to model a single span of gray (or black) pixels */ /* when rendering a monochrome or anti-aliased bitmap. */ /* */ /* <Fields> */ /* x :: The span's horizontal start position. */ /* */ /* len :: The span's length in pixels. */ /* */ /* coverage :: The span color/coverage, ranging from 0 (background) */ /* to 255 (foreground). Only used for anti-aliased */ /* rendering. */ /* */ /* <Note> */ /* This structure is used by the span drawing callback type named */ /* QT_FT_SpanFunc which takes the y-coordinate of the span as a */ /* a parameter. */ /* */ /* The coverage value is always between 0 and 255, even if the number */ /* of gray levels have been set through QT_FT_Set_Gray_Levels(). */ /* */ typedef struct QT_FT_Span_ { short x; unsigned short len; short y; unsigned char coverage; } QT_FT_Span; /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_SpanFunc */ /* */ /* <Description> */ /* A function used as a call-back by the anti-aliased renderer in */ /* order to let client applications draw themselves the gray pixel */ /* spans on each scan line. */ /* */ /* <Input> */ /* y :: The scanline's y-coordinate. */ /* */ /* count :: The number of spans to draw on this scanline. */ /* */ /* spans :: A table of `count' spans to draw on the scanline. */ /* */ /* user :: User-supplied data that is passed to the callback. */ /* */ /* <Note> */ /* This callback allows client applications to directly render the */ /* gray spans of the anti-aliased bitmap to any kind of surfaces. */ /* */ /* This can be used to write anti-aliased outlines directly to a */ /* given background bitmap, and even perform translucency. */ /* */ /* Note that the `count' field cannot be greater than a fixed value */ /* defined by the QT_FT_MAX_GRAY_SPANS configuration macro in */ /* ftoption.h. By default, this value is set to 32, which means that */ /* if there are more than 32 spans on a given scanline, the callback */ /* will be called several times with the same `y' parameter in order */ /* to draw all callbacks. */ /* */ /* Otherwise, the callback is only called once per scan-line, and */ /* only for those scanlines that do have `gray' pixels on them. */ /* */ typedef void (*QT_FT_SpanFunc)(int count, const QT_FT_Span* spans, void* worker); #define QT_FT_Raster_Span_Func QT_FT_SpanFunc /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_BitTest_Func */ /* */ /* <Description> */ /* THIS TYPE IS DEPRECATED. DO NOT USE IT. */ /* */ /* A function used as a call-back by the monochrome scan-converter */ /* to test whether a given target pixel is already set to the drawing */ /* `color'. These tests are crucial to implement drop-out control */ /* per-se the TrueType spec. */ /* */ /* <Input> */ /* y :: The pixel's y-coordinate. */ /* */ /* x :: The pixel's x-coordinate. */ /* */ /* user :: User-supplied data that is passed to the callback. */ /* */ /* <Return> */ /* 1 if the pixel is `set', 0 otherwise. */ /* */ typedef int (*QT_FT_Raster_BitTest_Func)( int y, int x, void* user ); /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_BitSet_Func */ /* */ /* <Description> */ /* THIS TYPE IS DEPRECATED. DO NOT USE IT. */ /* */ /* A function used as a call-back by the monochrome scan-converter */ /* to set an individual target pixel. This is crucial to implement */ /* drop-out control according to the TrueType specification. */ /* */ /* <Input> */ /* y :: The pixel's y-coordinate. */ /* */ /* x :: The pixel's x-coordinate. */ /* */ /* user :: User-supplied data that is passed to the callback. */ /* */ /* <Return> */ /* 1 if the pixel is `set', 0 otherwise. */ /* */ typedef void (*QT_FT_Raster_BitSet_Func)( int y, int x, void* user ); /*************************************************************************/ /* */ /* <Enum> */ /* QT_FT_RASTER_FLAG_XXX */ /* */ /* <Description> */ /* A list of bit flag constants as used in the `flags' field of a */ /* @QT_FT_Raster_Params structure. */ /* */ /* <Values> */ /* QT_FT_RASTER_FLAG_DEFAULT :: This value is 0. */ /* */ /* QT_FT_RASTER_FLAG_AA :: This flag is set to indicate that an */ /* anti-aliased glyph image should be */ /* generated. Otherwise, it will be */ /* monochrome (1-bit). */ /* */ /* QT_FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */ /* rendering. In this mode, client */ /* applications must provide their own span */ /* callback. This lets them directly */ /* draw or compose over an existing bitmap. */ /* If this bit is not set, the target */ /* pixmap's buffer _must_ be zeroed before */ /* rendering. */ /* */ /* Note that for now, direct rendering is */ /* only possible with anti-aliased glyphs. */ /* */ /* QT_FT_RASTER_FLAG_CLIP :: This flag is only used in direct */ /* rendering mode. If set, the output will */ /* be clipped to a box specified in the */ /* "clip_box" field of the QT_FT_Raster_Params */ /* structure. */ /* */ /* Note that by default, the glyph bitmap */ /* is clipped to the target pixmap, except */ /* in direct rendering mode where all spans */ /* are generated if no clipping box is set. */ /* */ #define QT_FT_RASTER_FLAG_DEFAULT 0x0 #define QT_FT_RASTER_FLAG_AA 0x1 #define QT_FT_RASTER_FLAG_DIRECT 0x2 #define QT_FT_RASTER_FLAG_CLIP 0x4 /* deprecated */ #define qt_ft_raster_flag_default QT_FT_RASTER_FLAG_DEFAULT #define qt_ft_raster_flag_aa QT_FT_RASTER_FLAG_AA #define qt_ft_raster_flag_direct QT_FT_RASTER_FLAG_DIRECT #define qt_ft_raster_flag_clip QT_FT_RASTER_FLAG_CLIP /*************************************************************************/ /* */ /* <Struct> */ /* QT_FT_Raster_Params */ /* */ /* <Description> */ /* A structure to hold the arguments used by a raster's render */ /* function. */ /* */ /* <Fields> */ /* target :: The target bitmap. */ /* */ /* source :: A pointer to the source glyph image (e.g. an */ /* QT_FT_Outline). */ /* */ /* flags :: The rendering flags. */ /* */ /* gray_spans :: The gray span drawing callback. */ /* */ /* black_spans :: The black span drawing callback. */ /* */ /* bit_test :: The bit test callback. UNIMPLEMENTED! */ /* */ /* bit_set :: The bit set callback. UNIMPLEMENTED! */ /* */ /* user :: User-supplied data that is passed to each drawing */ /* callback. */ /* */ /* clip_box :: An optional clipping box. It is only used in */ /* direct rendering mode. Note that coordinates here */ /* should be expressed in _integer_ pixels (and not in */ /* 26.6 fixed-point units). */ /* */ /* <Note> */ /* An anti-aliased glyph bitmap is drawn if the QT_FT_RASTER_FLAG_AA bit */ /* flag is set in the `flags' field, otherwise a monochrome bitmap */ /* will be generated. */ /* */ /* If the QT_FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */ /* raster will call the `gray_spans' callback to draw gray pixel */ /* spans, in the case of an aa glyph bitmap, it will call */ /* `black_spans', and `bit_test' and `bit_set' in the case of a */ /* monochrome bitmap. This allows direct composition over a */ /* pre-existing bitmap through user-provided callbacks to perform the */ /* span drawing/composition. */ /* */ /* Note that the `bit_test' and `bit_set' callbacks are required when */ /* rendering a monochrome bitmap, as they are crucial to implement */ /* correct drop-out control as defined in the TrueType specification. */ /* */ typedef struct QT_FT_Raster_Params_ { QT_FT_Bitmap* target; void* source; int flags; QT_FT_SpanFunc gray_spans; QT_FT_SpanFunc black_spans; QT_FT_Raster_BitTest_Func bit_test; /* doesn't work! */ QT_FT_Raster_BitSet_Func bit_set; /* doesn't work! */ void* user; QT_FT_BBox clip_box; int skip_spans; } QT_FT_Raster_Params; /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_NewFunc */ /* */ /* <Description> */ /* A function used to create a new raster object. */ /* */ /* <Input> */ /* memory :: A handle to the memory allocator. */ /* */ /* <Output> */ /* raster :: A handle to the new raster object. */ /* */ /* <Return> */ /* Error code. 0 means success. */ /* */ /* <Note> */ /* The `memory' parameter is a typeless pointer in order to avoid */ /* un-wanted dependencies on the rest of the FreeType code. In */ /* practice, it is a QT_FT_Memory, i.e., a handle to the standard */ /* FreeType memory allocator. However, this field can be completely */ /* ignored by a given raster implementation. */ /* */ typedef int (*QT_FT_Raster_NewFunc)( QT_FT_Raster* raster ); #define QT_FT_Raster_New_Func QT_FT_Raster_NewFunc /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_DoneFunc */ /* */ /* <Description> */ /* A function used to destroy a given raster object. */ /* */ /* <Input> */ /* raster :: A handle to the raster object. */ /* */ typedef void (*QT_FT_Raster_DoneFunc)( QT_FT_Raster raster ); #define QT_FT_Raster_Done_Func QT_FT_Raster_DoneFunc /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_ResetFunc */ /* */ /* <Description> */ /* FreeType provides an area of memory called the `render pool', */ /* available to all registered rasters. This pool can be freely used */ /* during a given scan-conversion but is shared by all rasters. Its */ /* content is thus transient. */ /* */ /* This function is called each time the render pool changes, or just */ /* after a new raster object is created. */ /* */ /* <Input> */ /* raster :: A handle to the new raster object. */ /* */ /* pool_base :: The address in memory of the render pool. */ /* */ /* pool_size :: The size in bytes of the render pool. */ /* */ /* <Note> */ /* Rasters can ignore the render pool and rely on dynamic memory */ /* allocation if they want to (a handle to the memory allocator is */ /* passed to the raster constructor). However, this is not */ /* recommended for efficiency purposes. */ /* */ typedef void (*QT_FT_Raster_ResetFunc)( QT_FT_Raster raster, unsigned char* pool_base, unsigned long pool_size ); #define QT_FT_Raster_Reset_Func QT_FT_Raster_ResetFunc /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_SetModeFunc */ /* */ /* <Description> */ /* This function is a generic facility to change modes or attributes */ /* in a given raster. This can be used for debugging purposes, or */ /* simply to allow implementation-specific `features' in a given */ /* raster module. */ /* */ /* <Input> */ /* raster :: A handle to the new raster object. */ /* */ /* mode :: A 4-byte tag used to name the mode or property. */ /* */ /* args :: A pointer to the new mode/property to use. */ /* */ typedef int (*QT_FT_Raster_SetModeFunc)( QT_FT_Raster raster, unsigned long mode, void* args ); #define QT_FT_Raster_Set_Mode_Func QT_FT_Raster_SetModeFunc /*************************************************************************/ /* */ /* <FuncType> */ /* QT_FT_Raster_RenderFunc */ /* */ /* <Description> */ /* Invokes a given raster to scan-convert a given glyph image into a */ /* target bitmap. */ /* */ /* <Input> */ /* raster :: A handle to the raster object. */ /* */ /* params :: A pointer to a QT_FT_Raster_Params structure used to store */ /* the rendering parameters. */ /* */ /* <Return> */ /* Error code. 0 means success. */ /* */ /* <Note> */ /* The exact format of the source image depends on the raster's glyph */ /* format defined in its QT_FT_Raster_Funcs structure. It can be an */ /* QT_FT_Outline or anything else in order to support a large array of */ /* glyph formats. */ /* */ /* Note also that the render function can fail and return a */ /* QT_FT_Err_Unimplemented_Feature error code if the raster used does */ /* not support direct composition. */ /* */ /* XXX: For now, the standard raster doesn't support direct */ /* composition but this should change for the final release (see */ /* the files demos/src/ftgrays.c and demos/src/ftgrays2.c for */ /* examples of distinct implementations which support direct */ /* composition). */ /* */ typedef int (*QT_FT_Raster_RenderFunc)( QT_FT_Raster raster, QT_FT_Raster_Params* params ); #define QT_FT_Raster_Render_Func QT_FT_Raster_RenderFunc /*************************************************************************/ /* */ /* <Struct> */ /* QT_FT_Raster_Funcs */ /* */ /* <Description> */ /* A structure used to describe a given raster class to the library. */ /* */ /* <Fields> */ /* glyph_format :: The supported glyph format for this raster. */ /* */ /* raster_new :: The raster constructor. */ /* */ /* raster_reset :: Used to reset the render pool within the raster. */ /* */ /* raster_render :: A function to render a glyph into a given bitmap. */ /* */ /* raster_done :: The raster destructor. */ /* */ typedef struct QT_FT_Raster_Funcs_ { QT_FT_Glyph_Format glyph_format; QT_FT_Raster_NewFunc raster_new; QT_FT_Raster_ResetFunc raster_reset; QT_FT_Raster_SetModeFunc raster_set_mode; QT_FT_Raster_RenderFunc raster_render; QT_FT_Raster_DoneFunc raster_done; } QT_FT_Raster_Funcs; /* */ QT_FT_END_HEADER #endif /* __FTIMAGE_H__ */ /* END */ ``````