third_party/freetype/include/ftimage.h - Issue 1413673003: Update bundled freetype to 2.6.1

Unified Diff: third_party/freetype/include/ftimage.h

Issue 1413673003: Update bundled freetype to 2.6.1 (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master

Patch Set: DEPS for corpus Created 5 years, 1 month ago

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Index: third_party/freetype/include/ftimage.h

diff --git a/third_party/freetype/include/ftimage.h b/third_party/freetype/include/ftimage.h

deleted file mode 100644

index 2f7ca2aaf55bd2cbe84da27fcf469cf7633fe6bb..0000000000000000000000000000000000000000

--- a/third_party/freetype/include/ftimage.h

+++ /dev/null

@@ -1,1220 +0,0 @@

-/***************************************************************************/

-/* */

-/* ftimage.h */

-/* */

-/* FreeType glyph image formats and default raster interface */

-/* (specification). */

-/* */

-/* 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 */

- /* FT_Outlines into FT_Bitmaps. */

- /* */

- /*************************************************************************/

-#ifndef __FTIMAGE_H__

-#define __FTIMAGE_H__

- /* _STANDALONE_ is from ftgrays.c */

-#ifndef _STANDALONE_

-#include <ft2build.h>

-#endif

-FT_BEGIN_HEADER

- /*************************************************************************/

- /* */

- /* <Section> */

- /* basic_types */

- /* */

- /*************************************************************************/

- /* */

- /* <Type> */

- /* FT_Pos */

- /* */

- /* <Description> */

- /* The type FT_Pos is used to store vectorial coordinates. Depending */

- /* on the context, these can represent distances in integer font */

- /* units, or 16.16, or 26.6 fixed-point pixel coordinates. */

- /* */

- typedef signed long FT_Pos;

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* FT_Vector */

- /* */

- /* <Description> */

- /* A simple structure used to store a 2D vector; coordinates are of */

- /* the FT_Pos type. */

- /* */

- /* <Fields> */

- /* x :: The horizontal coordinate. */

- /* y :: The vertical coordinate. */

- /* */

- typedef struct FT_Vector_

- {

- FT_Pos x;

- FT_Pos y;

- } FT_Vector;

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* FT_BBox */

- /* */

- /* <Description> */

- /* A structure used to hold an outline's bounding box, i.e., the */

- /* coordinates of its extrema in the horizontal and vertical */

- /* directions. */

- /* */

- /* <Fields> */

- /* xMin :: The horizontal minimum (left-most). */

- /* */

- /* yMin :: The vertical minimum (bottom-most). */

- /* */

- /* xMax :: The horizontal maximum (right-most). */

- /* */

- /* yMax :: The vertical maximum (top-most). */

- /* */

- /* <Note> */

- /* The bounding box is specified with the coordinates of the lower */

- /* left and the upper right corner. In PostScript, those values are */

- /* often called (llx,lly) and (urx,ury), respectively. */

- /* */

- /* If `yMin' is negative, this value gives the glyph's descender. */

- /* Otherwise, the glyph doesn't descend below the baseline. */

- /* Similarly, if `ymax' is positive, this value gives the glyph's */

- /* ascender. */

- /* */

- /* `xMin' gives the horizontal distance from the glyph's origin to */

- /* the left edge of the glyph's bounding box. If `xMin' is negative, */

- /* the glyph extends to the left of the origin. */

- /* */

- typedef struct FT_BBox_

- {

- FT_Pos xMin, yMin;

- FT_Pos xMax, yMax;

- } FT_BBox;

- /*************************************************************************/

- /* */

- /* <Enum> */

- /* FT_Pixel_Mode */

- /* */

- /* <Description> */

- /* An enumeration type used to describe the format of pixels in a */

- /* given bitmap. Note that additional formats may be added in the */

- /* future. */

- /* */

- /* <Values> */

- /* FT_PIXEL_MODE_NONE :: */

- /* Value~0 is reserved. */

- /* */

- /* 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. */

- /* */

- /* 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 `gray' levels is stored in the `num_grays' field of the */

- /* @FT_Bitmap structure (it generally is 256). */

- /* */

- /* FT_PIXEL_MODE_GRAY2 :: */

- /* A 2-bit per 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. */

- /* */

- /* FT_PIXEL_MODE_GRAY4 :: */

- /* A 4-bit per pixel bitmap, representing embedded anti-aliased */

- /* bitmaps in font files according to the OpenType specification. */

- /* We haven't found a single font using this format, however. */

- /* */

- /* FT_PIXEL_MODE_LCD :: */

- /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */

- /* used for display on LCD displays; the bitmap is three times */

- /* wider than the original glyph image. See also */

- /* @FT_RENDER_MODE_LCD. */

- /* */

- /* FT_PIXEL_MODE_LCD_V :: */

- /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */

- /* used for display on rotated LCD displays; the bitmap is three */

- /* times taller than the original glyph image. See also */

- /* @FT_RENDER_MODE_LCD_V. */

- /* */

- /* FT_PIXEL_MODE_BGRA :: */

- /* An image with four 8-bit channels per pixel, representing a */

- /* color image (such as emoticons) with alpha channel. For each */

- /* pixel, the format is BGRA, which means, the blue channel comes */

- /* first in memory. The color channels are pre-multiplied and in */

- /* the sRGB colorspace. For example, full red at half-translucent */

- /* opacity will be represented as `00,00,80,80', not `00,00,FF,80'. */

- /* See also @FT_LOAD_COLOR. */

- /* */

- typedef enum FT_Pixel_Mode_

- {

- FT_PIXEL_MODE_NONE = 0,

- FT_PIXEL_MODE_MONO,

- FT_PIXEL_MODE_GRAY,

- FT_PIXEL_MODE_GRAY2,

- FT_PIXEL_MODE_GRAY4,

- FT_PIXEL_MODE_LCD,

- FT_PIXEL_MODE_LCD_V,

- FT_PIXEL_MODE_BGRA,

- FT_PIXEL_MODE_MAX /* do not remove */

- } FT_Pixel_Mode;

- /* these constants are deprecated; use the corresponding `FT_Pixel_Mode' */

- /* values instead. */

-#define ft_pixel_mode_none FT_PIXEL_MODE_NONE

-#define ft_pixel_mode_mono FT_PIXEL_MODE_MONO

-#define ft_pixel_mode_grays FT_PIXEL_MODE_GRAY

-#define ft_pixel_mode_pal2 FT_PIXEL_MODE_GRAY2

-#define ft_pixel_mode_pal4 FT_PIXEL_MODE_GRAY4

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* FT_Bitmap */

- /* */

- /* <Description> */

- /* 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. */

- /* */

- /* <Fields> */

- /* 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. */

- /* */

- /* Note that `padding' means the alignment of a */

- /* bitmap to a byte border, and FreeType functions */

- /* normally align to the smallest possible integer */

- /* value. */

- /* */

- /* For the B/W rasterizer, `pitch' is always an even */

- /* number. */

- /* */

- /* To change the pitch of a bitmap (say, to make it a */

- /* multiple of 4), use @FT_Bitmap_Convert. */

- /* Alternatively, you might use callback functions to */

- /* directly render to the application's surface; see */

- /* the file `example2.cpp' in the tutorial for a */

- /* demonstration. */

- /* */

- /* 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 */

- /* @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 @FT_Pixel_Mode for possible values. */

- /* */

- /* palette_mode :: This field is intended for paletted pixel modes; */

- /* it indicates how the palette is stored. Not */

- /* used currently. */

- /* */

- /* palette :: A typeless pointer to the bitmap palette; this */

- /* field is intended for paletted pixel modes. Not */

- /* used currently. */

- /* */

- /* <Note> */

- /* For now, the only pixel modes supported by FreeType are mono and */

- /* grays. However, drivers might be added in the future to support */

- /* more `colorful' options. */

- /* */

- typedef struct FT_Bitmap_

- {

- unsigned int rows;

- unsigned int width;

- int pitch;

- unsigned char* buffer;

- unsigned short num_grays;

- unsigned char pixel_mode;

- unsigned char palette_mode;

- void* palette;

- } FT_Bitmap;

- /*************************************************************************/

- /* */

- /* <Section> */

- /* outline_processing */

- /* */

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* FT_Outline */

- /* */

- /* <Description> */

- /* This structure is used to describe an outline to the scan-line */

- /* converter. */

- /* */

- /* <Fields> */

- /* 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' @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 Bézier control point, while it is `on' if */

- /* set. */

- /* */

- /* Bit~1 is meaningful for `off' points only. If set, */

- /* it indicates a third-order Bézier arc control point; */

- /* and a second-order control point if unset. */

- /* */

- /* If bit~2 is set, bits 5-7 contain the drop-out mode */

- /* (as defined in the OpenType specification; the value */

- /* is the same as the argument to the SCANMODE */

- /* instruction). */

- /* */

- /* Bits 3 and~4 are reserved for internal purposes. */

- /* */

- /* 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 @FT_OUTLINE_XXX. */

- /* */

- /* <Note> */

- /* The B/W rasterizer only checks bit~2 in the `tags' array for the */

- /* first point of each contour. The drop-out mode as given with */

- /* @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and */

- /* @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden. */

- /* */

- typedef struct FT_Outline_

- {

- short n_contours; /* number of contours in glyph */

- short n_points; /* number of points in the glyph */

- FT_Vector* points; /* the outline's points */

- char* tags; /* the points flags */

- short* contours; /* the contour end points */

- int flags; /* outline masks */

- } FT_Outline;

- /* */

- /* Following limits must be consistent with */

- /* FT_Outline.{n_contours,n_points} */

-#define FT_OUTLINE_CONTOURS_MAX SHRT_MAX

-#define FT_OUTLINE_POINTS_MAX SHRT_MAX

- /*************************************************************************/

- /* */

- /* <Enum> */

- /* FT_OUTLINE_XXX */

- /* */

- /* <Description> */

- /* A list of bit-field constants use for the flags in an outline's */

- /* `flags' field. */

- /* */

- /* <Values> */

- /* FT_OUTLINE_NONE :: */

- /* Value~0 is reserved. */

- /* */

- /* FT_OUTLINE_OWNER :: */

- /* If set, this flag indicates that the outline's field arrays */

- /* (i.e., `points', `flags', and `contours') are `owned' by the */

- /* outline object, and should thus be freed when it is destroyed. */

- /* */

- /* 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 rasterizer). */

- /* */

- /* 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. */

- /* */

- /* 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. See below for more information. */

- /* */

- /* FT_OUTLINE_SMART_DROPOUTS :: */

- /* Select smart dropout control. If unset, use simple dropout */

- /* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See */

- /* below for more information. */

- /* */

- /* FT_OUTLINE_INCLUDE_STUBS :: */

- /* If set, turn pixels on for `stubs', otherwise exclude them. */

- /* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See below for */

- /* more information. */

- /* */

- /* 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. */

- /* */

- /* 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. */

- /* */

- /* <Note> */

- /* The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */

- /* and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth */

- /* rasterizer. */

- /* */

- /* There exists a second mechanism to pass the drop-out mode to the */

- /* B/W rasterizer; see the `tags' field in @FT_Outline. */

- /* */

- /* Please refer to the description of the `SCANTYPE' instruction in */

- /* the OpenType specification (in file `ttinst1.doc') how simple */

- /* drop-outs, smart drop-outs, and stubs are defined. */

- /* */

-#define FT_OUTLINE_NONE 0x0

-#define FT_OUTLINE_OWNER 0x1

-#define FT_OUTLINE_EVEN_ODD_FILL 0x2

-#define FT_OUTLINE_REVERSE_FILL 0x4

-#define FT_OUTLINE_IGNORE_DROPOUTS 0x8

-#define FT_OUTLINE_SMART_DROPOUTS 0x10

-#define FT_OUTLINE_INCLUDE_STUBS 0x20

-#define FT_OUTLINE_HIGH_PRECISION 0x100

-#define FT_OUTLINE_SINGLE_PASS 0x200

- /* these constants are deprecated; use the corresponding */

- /* `FT_OUTLINE_XXX' values instead */

-#define ft_outline_none FT_OUTLINE_NONE

-#define ft_outline_owner FT_OUTLINE_OWNER

-#define ft_outline_even_odd_fill FT_OUTLINE_EVEN_ODD_FILL

-#define ft_outline_reverse_fill FT_OUTLINE_REVERSE_FILL

-#define ft_outline_ignore_dropouts FT_OUTLINE_IGNORE_DROPOUTS

-#define ft_outline_high_precision FT_OUTLINE_HIGH_PRECISION

-#define ft_outline_single_pass FT_OUTLINE_SINGLE_PASS

- /* */

-#define FT_CURVE_TAG( flag ) ( flag & 3 )

-#define FT_CURVE_TAG_ON 1

-#define FT_CURVE_TAG_CONIC 0

-#define FT_CURVE_TAG_CUBIC 2

-#define FT_CURVE_TAG_HAS_SCANMODE 4

-#define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */

-#define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */

-#define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \

- FT_CURVE_TAG_TOUCH_Y )

-#define FT_Curve_Tag_On FT_CURVE_TAG_ON

-#define FT_Curve_Tag_Conic FT_CURVE_TAG_CONIC

-#define FT_Curve_Tag_Cubic FT_CURVE_TAG_CUBIC

-#define FT_Curve_Tag_Touch_X FT_CURVE_TAG_TOUCH_X

-#define FT_Curve_Tag_Touch_Y FT_CURVE_TAG_TOUCH_Y

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Outline_MoveToFunc */

- /* */

- /* <Description> */

- /* 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. */

- /* */

- /* <Input> */

- /* 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. */

- /* */

- /* <Return> */

- /* Error code. 0~means success. */

- /* */

- typedef int

- (*FT_Outline_MoveToFunc)( const FT_Vector* to,

- void* user );

-#define FT_Outline_MoveTo_Func FT_Outline_MoveToFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Outline_LineToFunc */

- /* */

- /* <Description> */

- /* 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. */

- /* */

- /* <Input> */

- /* 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. */

- /* */

- /* <Return> */

- /* Error code. 0~means success. */

- /* */

- typedef int

- (*FT_Outline_LineToFunc)( const FT_Vector* to,

- void* user );

-#define FT_Outline_LineTo_Func FT_Outline_LineToFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Outline_ConicToFunc */

- /* */

- /* <Description> */

- /* A function pointer type used to describe the signature of a `conic */

- /* to' function during outline walking or decomposition. */

- /* */

- /* A `conic to' is emitted to indicate a second-order Bézier arc in */

- /* the outline. */

- /* */

- /* <Input> */

- /* 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. */

- /* */

- /* <Return> */

- /* Error code. 0~means success. */

- /* */

- typedef int

- (*FT_Outline_ConicToFunc)( const FT_Vector* control,

- const FT_Vector* to,

- void* user );

-#define FT_Outline_ConicTo_Func FT_Outline_ConicToFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Outline_CubicToFunc */

- /* */

- /* <Description> */

- /* A function pointer type used to describe the signature of a `cubic */

- /* to' function during outline walking or decomposition. */

- /* */

- /* A `cubic to' is emitted to indicate a third-order Bézier arc. */

- /* */

- /* <Input> */

- /* control1 :: A pointer to the first Bézier control point. */

- /* */

- /* control2 :: A pointer to the second Bézier control point. */

- /* */

- /* to :: A pointer to the target end point. */

- /* */

- /* user :: A typeless pointer, which is passed from the caller of */

- /* the decomposition function. */

- /* */

- /* <Return> */

- /* Error code. 0~means success. */

- /* */

- typedef int

- (*FT_Outline_CubicToFunc)( const FT_Vector* control1,

- const FT_Vector* control2,

- const FT_Vector* to,

- void* user );

-#define FT_Outline_CubicTo_Func FT_Outline_CubicToFunc

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* FT_Outline_Funcs */

- /* */

- /* <Description> */

- /* A structure to hold various function pointers used during outline */

- /* decomposition in order to emit segments, conic, and cubic Béziers. */

- /* */

- /* <Fields> */

- /* move_to :: The `move to' emitter. */

- /* */

- /* line_to :: The segment emitter. */

- /* */

- /* conic_to :: The second-order Bézier arc emitter. */

- /* */

- /* cubic_to :: The third-order Bézier 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. */

- /* */

- /* <Note> */

- /* 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 values of `shift' and `delta' to~0 to get the original */

- /* point coordinates. */

- /* */

- typedef struct FT_Outline_Funcs_

- {

- FT_Outline_MoveToFunc move_to;

- FT_Outline_LineToFunc line_to;

- FT_Outline_ConicToFunc conic_to;

- FT_Outline_CubicToFunc cubic_to;

- int shift;

- FT_Pos delta;

- } FT_Outline_Funcs;

- /*************************************************************************/

- /* */

- /* <Section> */

- /* basic_types */

- /* */

- /*************************************************************************/

- /* */

- /* <Macro> */

- /* FT_IMAGE_TAG */

- /* */

- /* <Description> */

- /* This macro converts four-letter tags to an unsigned long type. */

- /* */

- /* <Note> */

- /* Since many 16-bit compilers don't like 32-bit enumerations, you */

- /* should redefine this macro in case of problems to something like */

- /* this: */

- /* */

- /* { */

- /* #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */

- /* } */

- /* */

- /* to get a simple enumeration without assigning special numbers. */

- /* */

-#ifndef FT_IMAGE_TAG

-#define 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 /* FT_IMAGE_TAG */

- /*************************************************************************/

- /* */

- /* <Enum> */

- /* FT_Glyph_Format */

- /* */

- /* <Description> */

- /* 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. */

- /* */

- /* <Values> */

- /* FT_GLYPH_FORMAT_NONE :: */

- /* The value~0 is reserved. */

- /* */

- /* FT_GLYPH_FORMAT_COMPOSITE :: */

- /* The glyph image is a composite of several other images. This */

- /* format is _only_ used with @FT_LOAD_NO_RECURSE, and is used to */

- /* report compound glyphs (like accented characters). */

- /* */

- /* FT_GLYPH_FORMAT_BITMAP :: */

- /* The glyph image is a bitmap, and can be described as an */

- /* @FT_Bitmap. You generally need to access the `bitmap' field of */

- /* the @FT_GlyphSlotRec structure to read it. */

- /* */

- /* FT_GLYPH_FORMAT_OUTLINE :: */

- /* The glyph image is a vectorial outline made of line segments */

- /* and Bézier arcs; it can be described as an @FT_Outline; you */

- /* generally want to access the `outline' field of the */

- /* @FT_GlyphSlotRec structure to read it. */

- /* */

- /* FT_GLYPH_FORMAT_PLOTTER :: */

- /* The glyph image is a vectorial path with no inside and outside */

- /* contours. Some Type~1 fonts, like those in the Hershey family, */

- /* contain glyphs in this format. These are described as */

- /* @FT_Outline, but FreeType isn't currently capable of rendering */

- /* them correctly. */

- /* */

- typedef enum FT_Glyph_Format_

- {

- FT_IMAGE_TAG( FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),

- FT_IMAGE_TAG( FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),

- FT_IMAGE_TAG( FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ),

- FT_IMAGE_TAG( FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ),

- FT_IMAGE_TAG( FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' )

- } FT_Glyph_Format;

- /* these constants are deprecated; use the corresponding */

- /* `FT_Glyph_Format' values instead. */

-#define ft_glyph_format_none FT_GLYPH_FORMAT_NONE

-#define ft_glyph_format_composite FT_GLYPH_FORMAT_COMPOSITE

-#define ft_glyph_format_bitmap FT_GLYPH_FORMAT_BITMAP

-#define ft_glyph_format_outline FT_GLYPH_FORMAT_OUTLINE

-#define ft_glyph_format_plotter 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 `ftrender.h' for more */

- /* details on renderers. */

- /* */

- /*************************************************************************/

- /* */

- /* <Section> */

- /* raster */

- /* */

- /* <Title> */

- /* Scanline Converter */

- /* */

- /* <Abstract> */

- /* How vectorial outlines are converted into bitmaps and pixmaps. */

- /* */

- /* <Description> */

- /* This section contains technical definitions. */

- /* */

- /* <Order> */

- /* FT_Raster */

- /* FT_Span */

- /* FT_SpanFunc */

- /* */

- /* FT_Raster_Params */

- /* FT_RASTER_FLAG_XXX */

- /* */

- /* FT_Raster_NewFunc */

- /* FT_Raster_DoneFunc */

- /* FT_Raster_ResetFunc */

- /* FT_Raster_SetModeFunc */

- /* FT_Raster_RenderFunc */

- /* FT_Raster_Funcs */

- /* */

- /*************************************************************************/

- /* */

- /* <Type> */

- /* FT_Raster */

- /* */

- /* <Description> */

- /* An opaque handle (pointer) to a raster object. Each object can be */

- /* used independently to convert an outline into a bitmap or pixmap. */

- /* */

- typedef struct FT_RasterRec_* FT_Raster;

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* FT_Span */

- /* */

- /* <Description> */

- /* A structure used to model a single span of gray pixels when */

- /* rendering an 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). */

- /* */

- /* <Note> */

- /* This structure is used by the span drawing callback type named */

- /* @FT_SpanFunc that takes the y~coordinate of the span as a */

- /* parameter. */

- /* */

- /* The coverage value is always between 0 and 255. If you want less */

- /* gray values, the callback function has to reduce them. */

- /* */

- typedef struct FT_Span_

- {

- short x;

- unsigned short len;

- unsigned char coverage;

- } FT_Span;

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* 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 `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 is 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

- (*FT_SpanFunc)( int y,

- int count,

- const FT_Span* spans,

- void* user );

-#define FT_Raster_Span_Func FT_SpanFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Raster_BitTest_Func */

- /* */

- /* <Description> */

- /* Deprecated, unimplemented. */

- /* */

- typedef int

- (*FT_Raster_BitTest_Func)( int y,

- int x,

- void* user );

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Raster_BitSet_Func */

- /* */

- /* <Description> */

- /* Deprecated, unimplemented. */

- /* */

- typedef void

- (*FT_Raster_BitSet_Func)( int y,

- int x,

- void* user );

- /*************************************************************************/

- /* */

- /* <Enum> */

- /* FT_RASTER_FLAG_XXX */

- /* */

- /* <Description> */

- /* A list of bit flag constants as used in the `flags' field of a */

- /* @FT_Raster_Params structure. */

- /* */

- /* <Values> */

- /* FT_RASTER_FLAG_DEFAULT :: This value is 0. */

- /* */

- /* 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). */

- /* */

- /* 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. */

- /* */

- /* Direct rendering is only possible with */

- /* anti-aliased glyphs. */

- /* */

- /* 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 */

- /* @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 FT_RASTER_FLAG_DEFAULT 0x0

-#define FT_RASTER_FLAG_AA 0x1

-#define FT_RASTER_FLAG_DIRECT 0x2

-#define FT_RASTER_FLAG_CLIP 0x4

- /* these constants are deprecated; use the corresponding */

- /* `FT_RASTER_FLAG_XXX' values instead */

-#define ft_raster_flag_default FT_RASTER_FLAG_DEFAULT

-#define ft_raster_flag_aa FT_RASTER_FLAG_AA

-#define ft_raster_flag_direct FT_RASTER_FLAG_DIRECT

-#define ft_raster_flag_clip FT_RASTER_FLAG_CLIP

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* 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 */

- /* @FT_Outline). */

- /* */

- /* flags :: The rendering flags. */

- /* */

- /* gray_spans :: The gray span drawing callback. */

- /* */

- /* black_spans :: Unused. */

- /* */

- /* bit_test :: Unused. */

- /* */

- /* bit_set :: Unused. */

- /* */

- /* 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 @FT_RASTER_FLAG_AA */

- /* bit flag is set in the `flags' field, otherwise a monochrome */

- /* bitmap is generated. */

- /* */

- /* If the @FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */

- /* raster will call the `gray_spans' callback to draw gray pixel */

- /* spans. This allows direct composition over a pre-existing bitmap */

- /* through user-provided callbacks to perform the span drawing and */

- /* composition. Not supported by the monochrome rasterizer. */

- /* */

- typedef struct FT_Raster_Params_

- {

- const FT_Bitmap* target;

- const void* source;

- int flags;

- FT_SpanFunc gray_spans;

- FT_SpanFunc black_spans; /* unused */

- FT_Raster_BitTest_Func bit_test; /* unused */

- FT_Raster_BitSet_Func bit_set; /* unused */

- void* user;

- FT_BBox clip_box;

- } FT_Raster_Params;

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* 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 an @FT_Memory object, i.e., a handle to the */

- /* standard FreeType memory allocator. However, this field can be */

- /* completely ignored by a given raster implementation. */

- /* */

- typedef int

- (*FT_Raster_NewFunc)( void* memory,

- FT_Raster* raster );

-#define FT_Raster_New_Func FT_Raster_NewFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Raster_DoneFunc */

- /* */

- /* <Description> */

- /* A function used to destroy a given raster object. */

- /* */

- /* <Input> */

- /* raster :: A handle to the raster object. */

- /* */

- typedef void

- (*FT_Raster_DoneFunc)( FT_Raster raster );

-#define FT_Raster_Done_Func FT_Raster_DoneFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* 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

- (*FT_Raster_ResetFunc)( FT_Raster raster,

- unsigned char* pool_base,

- unsigned long pool_size );

-#define FT_Raster_Reset_Func FT_Raster_ResetFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* 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

- (*FT_Raster_SetModeFunc)( FT_Raster raster,

- unsigned long mode,

- void* args );

-#define FT_Raster_Set_Mode_Func FT_Raster_SetModeFunc

- /*************************************************************************/

- /* */

- /* <FuncType> */

- /* FT_Raster_RenderFunc */

- /* */

- /* <Description> */

- /* Invoke 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 an @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 @FT_Raster_Funcs structure. It can be an */

- /* @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 */

- /* `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 that support direct */

- /* composition). */

- /* */

- typedef int

- (*FT_Raster_RenderFunc)( FT_Raster raster,

- const FT_Raster_Params* params );

-#define FT_Raster_Render_Func FT_Raster_RenderFunc

- /*************************************************************************/

- /* */

- /* <Struct> */

- /* 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 FT_Raster_Funcs_

- {

- FT_Glyph_Format glyph_format;

- FT_Raster_NewFunc raster_new;

- FT_Raster_ResetFunc raster_reset;

- FT_Raster_SetModeFunc raster_set_mode;

- FT_Raster_RenderFunc raster_render;

- FT_Raster_DoneFunc raster_done;

- } FT_Raster_Funcs;

- /* */

-FT_END_HEADER

-#endif /* __FTIMAGE_H__ */

-/* END */

-/* Local Variables: */

-/* coding: utf-8 */

-/* End: */

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