| /***************************************************************************/ |
| /* */ |
| /* ftimage.h */ |
| /* */ |
| /* This file defines the glyph image formats recognized by FreeType, as */ |
| /* well as the default raster interface. */ |
| /* */ |
| /* Copyright 1996-1999 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. */ |
| /* */ |
| /***************************************************************************/ |
| |
| #ifndef FTIMAGE_H |
| #define FTIMAGE_H |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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 26.6 fixed float 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; |
| |
| |
| /************************************************************************* |
| * |
| * <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. |
| * |
| * <Fields> |
| * ft_pixel_mode_mono :: a monochrome bitmap (1 bit/pixel) |
| * |
| * ft_pixel_mode_grays :: an 8-bit gray-levels bitmap. Note that |
| * the total number of gray levels is given |
| * in the `num_grays' field of the FT_Bitmap |
| * structure. |
| * |
| * ft_pixel_mode_pal2 :: a 2-bit paletted bitmap. |
| * currently unused by FreeType. |
| * |
| * ft_pixel_mode_pal4 :: a 4-bit paletted bitmap. |
| * currently unused by FreeType. |
| * |
| * ft_pixel_mode_pal8 :: an 8-bit paletted bitmap. |
| * currently unused by FreeType. |
| * |
| * ft_pixel_mode_rgb15 :: a 15-bit RGB bitmap. Uses 5:5:5 encoding |
| * currently unused by FreeType. |
| * |
| * ft_pixel_mode_rgb16 :: a 16-bit RGB bitmap. Uses 5:6:5 encoding |
| * currently unused by FreeType. |
| * |
| * ft_pixel_mode_rgb24 :: a 24-bit RGB bitmap. |
| * currently unused by FreeType. |
| * |
| * ft_pixel_mode_rgb32 :: a 32-bit RGB bitmap. |
| * currently unused by FreeType. |
| * |
| * <Note> |
| * Some anti-aliased bitmaps might be embedded in TrueType fonts |
| * using formats pal2 or pal4, though no fonts presenting those |
| * have been found to date.. |
| * |
| *************************************************************************/ |
| |
| typedef enum FT_Pixel_Mode_ |
| { |
| ft_pixel_mode_none = 0, |
| ft_pixel_mode_mono, |
| ft_pixel_mode_grays, |
| ft_pixel_mode_pal2, |
| ft_pixel_mode_pal4, |
| ft_pixel_mode_pal8, |
| ft_pixel_mode_rgb15, |
| ft_pixel_mode_rgb16, |
| ft_pixel_mode_rgb24, |
| ft_pixel_mode_rgb32, |
| |
| ft_pixel_mode_max /* do not remove */ |
| |
| } FT_Pixel_Mode; |
| |
| |
| |
| /************************************************************************* |
| * |
| * <Enum> |
| * FT_Palette_Mode |
| * |
| * <Description> |
| * An enumeration type used to describe the format of a bitmap |
| * palette, used with ft_pixel_mode_pal4 and ft_pixel_mode_pal8 |
| * |
| * <Fields> |
| * ft_palette_mode_rgb :: the palette is an array of 3-bytes RGB records |
| * |
| * ft_palette_mode_rgba :: the palette is an array of 4-bytes RGBA records |
| * |
| * <Note> |
| * As ft_pixel_mode_pal2, pal4 and pal8 are currently unused by |
| * FreeType, these types are not handled by the library itself. |
| * |
| *************************************************************************/ |
| |
| typedef enum FT_Palette_Mode_ |
| { |
| ft_palette_mode_rgb = 0, |
| ft_palette_mode_rgba, |
| |
| ft_palettte_mode_max /* do not remove */ |
| |
| } FT_Palette_Mode; |
| |
| |
| /************************************************************************* |
| * |
| * <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_grays, |
| * it gives the number of gray levels used in the |
| * bitmap. |
| * |
| * pixel_mode :: the pixel_mode, i.e. how pixel bits are stored |
| * |
| * 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> |
| * 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 spec. |
| * |
| * Note that no font was found presenting such embedded bitmaps, so this |
| * is currently completely unhandled by the library. |
| * |
| * |
| *************************************************************************/ |
| |
| typedef struct FT_Bitmap_ |
| { |
| int rows; |
| int width; |
| int pitch; |
| void* buffer; |
| short num_grays; |
| char pixel_mode; |
| char palette_mode; |
| void* palette; |
| |
| } FT_Bitmap; |
| |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Struct> */ |
| /* FT_Outline */ |
| /* */ |
| /* <Description> */ |
| /* This structure is used to describe an outline to the scan-line */ |
| /* converter. It's a copy of the TT_Outline type that was defined */ |
| /* in FreeType 1.x. */ |
| /* */ |
| /* <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. */ |
| /* */ |
| /* flags :: A pointer to an array of `n_points' chars, */ |
| /* giving each outline point's type. If bit 0 is */ |
| /* set, the point is `off' the curve, i.e., a */ |
| /* Bezier control point, while it is `on' when */ |
| /* unset. */ |
| /* */ |
| /* 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. */ |
| /* */ |
| /* owner :: This flag is a boolean which is set whenever the */ |
| /* outline structure/object owns the arrays it */ |
| /* refers to in the fields `points', `flags', and */ |
| /* `contours'. */ |
| /* */ |
| /* high_precision :: This flag is set automatically by the FreeType */ |
| /* library. It indicates that the scan-line */ |
| /* converter should use a higher precision when */ |
| /* rendering the outline. This is useful at small */ |
| /* pixel sizes to get adequate results, though at */ |
| /* the price of slower rendering. Don't try to */ |
| /* render large outlines with this flag set. Note */ |
| /* that it may be ignored in later implementations. */ |
| /* */ |
| /* second_pass :: A boolean which is set when the scan-line */ |
| /* converter should perform a second pass to */ |
| /* eliminate vertical drop-outs (only vertical */ |
| /* drop-outs are checked on the first pass). This */ |
| /* field may be ignored by later implementations. */ |
| /* */ |
| /* dropout_mode :: Specifies the drop-out control mode to use while */ |
| /* rendering an outline. Valid values are 0 (no */ |
| /* drop out check), 1, 2, 4, and 5. See the */ |
| /* TrueType specification for more details. A */ |
| /* value of 2 is usually an excellent generic */ |
| /* choice. This field may be ignored by some */ |
| /* raster implementations. */ |
| /* */ |
| /* */ |
| 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* flags; /* the points flags */ |
| short* contours; /* the contour end points */ |
| |
| char owner; /* the outline owns the coordinates, */ |
| /* flags, and contours array it uses */ |
| |
| char high_precision; /* high precision rendering */ |
| char second_pass; /* two sweeps rendering */ |
| char dropout_mode; /* dropout mode */ |
| |
| } FT_Outline; |
| |
| |
| #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_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) |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* FT_Outline_MoveTo_Func */ |
| /* */ |
| /* <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_MoveTo_Func)( FT_Vector* to, |
| void* user ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* FT_Outline_LineTo_Func */ |
| /* */ |
| /* <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_LineTo_Func)( FT_Vector* to, |
| void* user ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* FT_Outline_ConicTo_Func */ |
| /* */ |
| /* <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 Bezier 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_ConicTo_Func)( FT_Vector* control, |
| FT_Vector* to, |
| void* user ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* FT_Outline_CubicTo_Func */ |
| /* */ |
| /* <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 Bezier arc. */ |
| /* */ |
| /* <Input> */ |
| /* 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. */ |
| /* */ |
| /* <Return> */ |
| /* Error code. 0 means success. */ |
| /* */ |
| typedef int (*FT_Outline_CubicTo_Func)( FT_Vector* control1, |
| FT_Vector* control2, |
| FT_Vector* to, |
| void* user ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Struct> */ |
| /* FT_Outline_Funcs */ |
| /* */ |
| /* <Description> */ |
| /* 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. */ |
| /* */ |
| /* <Fields> */ |
| /* 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. */ |
| /* */ |
| typedef struct FT_Outline_Funcs_ |
| { |
| FT_Outline_MoveTo_Func move_to; |
| FT_Outline_LineTo_Func line_to; |
| FT_Outline_ConicTo_Func conic_to; |
| FT_Outline_CubicTo_Func cubic_to; |
| |
| } FT_Outline_Funcs; |
| |
| |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <Macro> */ |
| /* FT_IMAGE_TAG */ |
| /* */ |
| /* <Description> */ |
| /* This macro converts four letter tags which are used to label */ |
| /* TrueType tables into an unsigned long to be used within FreeType. */ |
| /* */ |
| #define FT_IMAGE_TAG( _x1, _x2, _x3, _x4 ) \ |
| (((unsigned long)_x1 << 24) | \ |
| ((unsigned long)_x2 << 16) | \ |
| ((unsigned long)_x3 << 8) | \ |
| (unsigned long)_x4) |
| |
| |
| /*********************************************************************** |
| * |
| * <Enum> |
| * FT_Glyph_Tag |
| * |
| * <Description> |
| * An enumeration type used to describethe 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. |
| * |
| * <Fields> |
| * ft_glyph_format_bitmap :: the glyph image is a bitmap, and can |
| * be described as a FT_Bitmap |
| * |
| * ft_glyph_format_outline :: the glyph image is a vectorial image |
| * made of bezier control points, and can |
| * be described as a FT_Outline |
| * |
| ***********************************************************************/ |
| |
| typedef enum FT_Glyph_Tag_ |
| { |
| ft_glyph_format_none = 0, |
| ft_glyph_format_composite = FT_IMAGE_TAG('c','o','m','p'), |
| ft_glyph_format_bitmap = FT_IMAGE_TAG('b','i','t','s'), |
| ft_glyph_format_outline = FT_IMAGE_TAG('o','u','t','l') |
| |
| } FT_Glyph_Tag; |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <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. */ |
| /* */ |
| typedef struct FT_RasterRec_* FT_Raster; |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* FT_Raster_Init_Proc */ |
| /* */ |
| /* <Description> */ |
| /* Initializes a fresh raster object which should have been allocated */ |
| /* by client applications. This function is also used to set the */ |
| /* object's render pool. It can be used repeatedly on a single */ |
| /* object if one wants to change the pool's address or size. */ |
| /* */ |
| /* Note that the render pool has no state and is only used during a */ |
| /* call to FT_Raster_Render(). It is thus theorically possible to */ |
| /* share it between several non-concurrent components of your */ |
| /* applications when memory is a scarce resource. */ |
| /* */ |
| /* <Input> */ |
| /* raster :: a handle to the target raster object. */ |
| /* pool_base :: the render pool's base address in memory */ |
| /* pool_size :: the render pool's size in bytes. this must be at */ |
| /* least 4 kByte. */ |
| /* <Return> */ |
| /* An error condition, used as a FT_Error in the FreeType library. */ |
| /* 0 means success. */ |
| /* */ |
| typedef int (*FT_Raster_Init_Proc)( FT_Raster raster, |
| const char* pool_base, |
| long pool_size ); |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* <FuncType> */ |
| /* FT_Raster_Set_Mode_Proc */ |
| /* */ |
| /* <Description> */ |
| /* Some raster implementations may have several modes of operation. */ |
| /* This function is used to select one of them, as well as pass some */ |
| /* arguments. */ |
| /* */ |
| /* <Input> */ |
| /* raster :: The target raster object. */ |
| /* */ |
| /* mode :: A pointer used to describe the mode to set. This is */ |
| /* completely raster-specific, and could be, for example, */ |
| /* a text string. */ |
| /* */ |
| /* args :: An argument to the set_mode command. This is completely */ |
| /* specific to the raster and the mode used. */ |
| /* */ |
| /* <Return> */ |
| /* An error code, used as a FT_Error by the FreeType library. */ |
| /* 0 means success. */ |
| /* */ |
| typedef int (*FT_Raster_Set_Mode_Proc)( FT_Raster raster, |
| const char* mode, |
| const char* args ); |
| |
| |
| /************************************************************************* |
| * |
| * <FuncType> |
| * FT_Raster_Render_Proc |
| * |
| * <Description> |
| * Renders an outline into a target bitmap/pixmap. |
| * |
| * <Input> |
| * raster :: A handle to a raster object used during rendering. |
| * |
| * source_image :: a typeless pointer to the source glyph image. |
| * (usually a FT_Outline*). |
| * |
| * target_bitmap :: descriptor to the target bitmap. |
| * |
| * <Return> |
| * Error code, interpreted as a FT_Error by FreeType library. |
| * 0 means success. |
| * |
| *************************************************************************/ |
| |
| typedef int (*FT_Raster_Render_Proc)( FT_Raster raster, |
| void* source_image, |
| FT_Bitmap* target_bitmap ); |
| |
| |
| /************************************************************************** |
| * |
| * <Struct> |
| * FT_Raster_Interface |
| * |
| * <Description> |
| * A structure used to model the default raster interface. A raster |
| * is a module in charge of converting a glyph image into a bitmap. |
| * |
| * <Fields> |
| * size :: the size in bytes of the given raster object. This |
| * is used to allocate a new raster when calling |
| * `FT_Set_Raster'. |
| * |
| * format :: the source glyph image format this raster is able to |
| * handle. |
| * |
| * init :: the raster's initialisation routine |
| * |
| * set_mode :: the raster's mode set routine |
| * |
| * render :: the raster's rendering routine |
| * |
| **************************************************************************/ |
| |
| typedef struct FT_Raster_Interface_ |
| { |
| long size; |
| FT_Glyph_Tag format_tag; |
| FT_Raster_Init_Proc init; |
| FT_Raster_Set_Mode_Proc set_mode; |
| FT_Raster_Render_Proc render; |
| |
| |
| } FT_Raster_Interface; |
| |
| |
| #endif /* FTIMAGE_H */ |
| |
| |
