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author | tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2009-01-12 22:47:43 +0000 |
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committer | tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2009-01-12 22:47:43 +0000 |
commit | c61a339ad465ecb43897975538a77c3eb87110be (patch) | |
tree | 7d5fb0f26cacb301d251c133801390b0fb0bdf95 /unicode/src/lib/freetype/ftimage.inc | |
parent | b11259674b78bc872c08d3f2d554ede56543e954 (diff) | |
download | usdx-c61a339ad465ecb43897975538a77c3eb87110be.tar.gz usdx-c61a339ad465ecb43897975538a77c3eb87110be.tar.xz usdx-c61a339ad465ecb43897975538a77c3eb87110be.zip |
freetype update
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@1569 b956fd51-792f-4845-bead-9b4dfca2ff2c
Diffstat (limited to '')
-rw-r--r-- | unicode/src/lib/freetype/ftimage.inc | 801 |
1 files changed, 801 insertions, 0 deletions
diff --git a/unicode/src/lib/freetype/ftimage.inc b/unicode/src/lib/freetype/ftimage.inc new file mode 100644 index 00000000..a6babc98 --- /dev/null +++ b/unicode/src/lib/freetype/ftimage.inc @@ -0,0 +1,801 @@ +(***************************************************************************) +(* *) +(* ftimage.h *) +(* *) +(* FreeType glyph image formats and default raster interface *) +(* (specification). *) +(* *) +(* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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. *) +(* *) +(***************************************************************************) +(***************************************************************************) +(* Pascal port by the UltraStar Deluxe Team *) +(***************************************************************************) + + (*************************************************************************) + (* *) + (* Note: A `raster' is simply a scan-line converter, used to render *) + (* FT_Outlines into FT_Bitmaps. *) + (* *) + (*************************************************************************) + +{$IFDEF TYPE_DECL} + + (*************************************************************************) + (* *) + (* <Type> *) + (* FT_Pos *) + (* *) + (* <Description> *) + (* The type 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. *) + (* *) + FT_Pos = cslong; + + + (*************************************************************************) + (* *) + (* <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. *) + (* *) + PFT_Vector = ^FT_Vector; + FT_Vector = record + x , + y : FT_Pos; + end; + + + (*************************************************************************) + (* *) + (* <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). *) + (* *) + PFT_BBox = ^FT_BBox; + FT_BBox = record + xMin, yMin : FT_Pos; + xMax, yMax : FT_Pos; + end; + + + (*************************************************************************) + (* *) + (* <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 value `gray' levels is stored in the `num_bytes' field of *) + (* the @FT_Bitmap structure (it generally is 256). *) + (* *) + (* 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. *) + (* *) + (* 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. *) + (* *) + (* 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 is three *) + (* times wider than the original glyph image. See also *) + (* @FT_RENDER_MODE_LCD. *) + (* *) + (* 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 *) + (* is three times taller than the original glyph image. See also *) + (* @FT_RENDER_MODE_LCD_V. *) + (* *) + FT_Pixel_Mode = cint; +{$ELSE TYPE_DECL} +const + FT_PIXEL_MODE_NONE = 0; + FT_PIXEL_MODE_MONO = FT_PIXEL_MODE_NONE + 1; + FT_PIXEL_MODE_GRAY = FT_PIXEL_MODE_MONO + 1; + FT_PIXEL_MODE_GRAY2 = FT_PIXEL_MODE_GRAY + 1; + FT_PIXEL_MODE_GRAY4 = FT_PIXEL_MODE_GRAY2 + 1; + FT_PIXEL_MODE_LCD = FT_PIXEL_MODE_GRAY4 + 1; + FT_PIXEL_MODE_LCD_V = FT_PIXEL_MODE_LCD + 1; + + FT_PIXEL_MODE_MAX = FT_PIXEL_MODE_LCD_V + 1; (* do not remove *) +{$ENDIF TYPE_DECL} +{$IFDEF TYPE_DECL} + + (*************************************************************************) + (* *) + (* <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. *) + (* *) + (* 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 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. *) + (* *) + (* <Note> *) + (* 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. *) + (* *) + PFT_Bitmap = ^FT_Bitmap; + FT_Bitmap = record + rows: FT_Int; + width: FT_Int; + pitch: FT_Int; + buffer: PByteArray; + num_grays: FT_Short; + pixel_mode: byte; + palette_mode: byte; + palette: pointer; + end; + + + (*************************************************************************) + (* *) + (* <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 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 FT_Outline_Flags. *) + (* *) + PFT_Outline = ^FT_Outline; + FT_Outline = record + n_contours: FT_Short; (* number of contours in glyph *) + n_points: FT_Short; (* number of points in the glyph *) + + points: PFT_Vector; (* the outline's points *) + tags: PChar; (* the points flags *) + contours: PFT_Short; (* the contour end points *) + + flags: FT_Int; (* outline masks *) + end; + +{$ELSE TYPE_DECL} + + (*************************************************************************) + (* *) + (* @macro: *) + (* FT_CURVE_TAG ( flag ) *) + (* *) + function FT_CURVE_TAG(flag: byte): byte; + +const + FT_CURVE_TAG_ON = 1; + FT_CURVE_TAG_CONIC = 0; + FT_CURVE_TAG_CUBIC = 2; + + FT_CURVE_TAG_TOUCH_X = 8; // reserved for the TrueType hinter + FT_CURVE_TAG_TOUCH_Y = 16; // reserved for the TrueType hinter + + FT_CURVE_TAG_TOUCH_BOTH = ( FT_CURVE_TAG_TOUCH_X or + FT_CURVE_TAG_TOUCH_Y ); +{$ENDIF TYPE_DECL} +{$IFDEF TYPE_DECL} + + (*************************************************************************) + (* *) + (* <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. *) + (* *) + FT_Outline_MoveToFunc = function(to_: {const} PFT_Vector; + user: Pointer): cint; cdecl; + + + (*************************************************************************) + (* *) + (* <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. *) + (* *) + FT_Outline_LineToFunc = function(to_: {const} PFT_Vector; + user: Pointer): cint; cdecl; + + + (*************************************************************************) + (* *) + (* <FuncType> *) + (* FT_Outline_ConicToFunc *) + (* *) + (* <Description> *) + (* 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 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. *) + (* *) + FT_Outline_ConicToFunc = function(control: {const} PFT_Vector; + to_: {const} PFT_Vector; + user: Pointer): cint; cdecl; + + + (*************************************************************************) + (* *) + (* <FuncType> *) + (* FT_Outline_CubicToFunc *) + (* *) + (* <Description> *) + (* 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 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. *) + (* *) + FT_Outline_CubicToFunc = function( control1: {const} PFT_Vector; + control2: {const} PFT_Vector; + to_: {const} PFT_Vector; + user: Pointer ): cint; cdecl; + + + (*************************************************************************) + (* *) + (* <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, *) + (* as well as `move to' and `close to' operations. *) + (* *) + (* <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 value of `shift' and `delta' to 0 to get the original *) + (* point coordinates. *) + (* *) + PFT_Outline_Funcs = ^FT_Outline_Funcs; + FT_Outline_Funcs = record + move_to: FT_Outline_MoveToFunc; + line_to: FT_Outline_LineToFunc; + conic_to: FT_Outline_ConicToFunc; + cubic_to: FT_Outline_CubicToFunc; + + shift: cint; + delta: FT_Pos; + end; + + + (*************************************************************************) + (* *) + (* <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 and does describe a glyph format. *) + (* *) + (* 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 vertorial outline made of line segments *) + (* and Bezier 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/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. *) + (* *) + FT_Glyph_Format = array[0..3] of char; +{$ELSE TYPE_DECL} +const + FT_GLYPH_FORMAT_NONE: FT_Glyph_Format = (#0, #0, #0, #0 ); + + FT_GLYPH_FORMAT_COMPOSITE: FT_Glyph_Format = ('c', 'o', 'm', 'p' ); + FT_GLYPH_FORMAT_BITMAP: FT_Glyph_Format = ('b', 'i', 't', 's' ); + FT_GLYPH_FORMAT_OUTLINE: FT_Glyph_Format = ('o', 'u', 't', 'l' ); + FT_GLYPH_FORMAT_PLOTTER: FT_Glyph_Format = ('p', 'l', 'o', 't' ); + +{$ENDIF TYPE_DECL} + + (*************************************************************************) + (*************************************************************************) + (*************************************************************************) + (***** *****) + (***** R A S T E R D E F I N I T I O N S *****) + (***** *****) + (*************************************************************************) + (*************************************************************************) + (*************************************************************************) + + + (*************************************************************************) + (* *) + (* A raster is a scan converter, in charge of rendering an outline into *) + (* a a bitmap. This section contains the public API for rasters. *) + (* *) + (* Note that in FreeType 2, all rasters are now encapsulated within *) + (* specific modules called `renderers'. See `freetype/ftrender.h' for *) + (* more details on renderers. *) + (* *) + (*************************************************************************) + + + (*************************************************************************) + (* *) + (* <Section> *) + (* raster *) + (* *) + (* <Title> *) + (* Scanline Converter *) + (* *) + (* <Abstract> *) + (* How vectorial outlines are converted into bitmaps and pixmaps. *) + (* *) + (* <Description> *) + (* This section contains technical definitions. *) + (* *) + (*************************************************************************) + +{$IFDEF TYPE_DECL} + + (*************************************************************************) + (* *) + (* <Type> *) + (* 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. *) + (* *) + FT_Raster = Pointer; + + + (*************************************************************************) + (* *) + (* <Struct> *) + (* 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 *) + (* @FT_SpanFunc which takes the y-coordinate of the span as a *) + (* a parameter. *) + (* *) + (* The coverage value is always between 0 and 255. *) + (* *) + PFT_Span = ^FT_Span; + FT_Span = record + x: cshort; + len: cushort; + coverage: cuchar; + end; + + + (*************************************************************************) + (* *) + (* <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. *) + (* *) + FT_SpanFunc = procedure(y: cint; + count: cint; + spans: {const} PFT_Span; + user: Pointer ); cdecl; + + + (*************************************************************************) + (* *) + (* <FuncType> *) + (* 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. *) + (* *) + FT_Raster_BitTest_Func = function(y: cint; + x: cint; + user: Pointer): cint; cdecl; + + + (*************************************************************************) + (* *) + (* <FuncType> *) + (* 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. *) + (* *) + FT_Raster_BitSet_Func = procedure(y: cint; + x: cint; + user: Pointer ); cdecl; + + + (*************************************************************************) + (* *) + (* <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. *) + (* *) + (* Note that for now, 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. *) + (* *) +{$ELSE TYPE_DECL} +const + FT_RASTER_FLAG_DEFAULT = $0; + FT_RASTER_FLAG_AA = $1; + FT_RASTER_FLAG_DIRECT = $2; + FT_RASTER_FLAG_CLIP = $4; + +{$ENDIF TYPE_DECL} +{$IFDEF TYPE_DECL} + + (*************************************************************************) + (* *) + (* <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 :: 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 @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, 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. *) + (* *) + PFT_Raster_Params = ^FT_Raster_Params; + FT_Raster_Params = record + target: {const} PFT_Bitmap; + source: {const} Pointer; + flags: cint; + gray_spans: FT_SpanFunc; + black_spans: FT_SpanFunc; + bit_test: FT_Raster_BitTest_Func; (* doesn't work! *) + bit_set: FT_Raster_BitSet_Func; (* doesn't work! *) + user: Pointer; + clip_box: FT_BBox; + end; + +{$ENDIF TYPE_DECL} + + |