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1237 lines
76 KiB
1237 lines
76 KiB
/***************************************************************************/ |
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/* */ |
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/* ftimage.h */ |
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/* */ |
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/* FreeType glyph image formats and default raster interface */ |
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/* (specification). */ |
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/* */ |
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/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 by */ |
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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/* */ |
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/* This file is part of the FreeType project, and may only be used, */ |
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/* modified, and distributed under the terms of the FreeType project */ |
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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/* this file you indicate that you have read the license and */ |
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/* understand and accept it fully. */ |
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/* */ |
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/***************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* Note: A `raster' is simply a scan-line converter, used to render */ |
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/* FT_Outlines into FT_Bitmaps. */ |
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/* */ |
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/*************************************************************************/ |
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#ifndef __FTIMAGE_H__ |
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#define __FTIMAGE_H__ |
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/* _STANDALONE_ is from ftgrays.c */ |
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#ifndef _STANDALONE_ |
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#include <ft2build.h> |
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#endif |
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FT_BEGIN_HEADER |
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/*************************************************************************/ |
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/* */ |
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/* <Section> */ |
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/* basic_types */ |
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/* */ |
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/*************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* <Type> */ |
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/* FT_Pos */ |
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/* */ |
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/* <Description> */ |
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/* The type FT_Pos is a 32-bit integer used to store vectorial */ |
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/* coordinates. Depending on the context, these can represent */ |
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/* distances in integer font units, or 16,16, or 26.6 fixed float */ |
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/* pixel coordinates. */ |
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/* */ |
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typedef signed long FT_Pos; |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* FT_Vector */ |
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/* */ |
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/* <Description> */ |
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/* A simple structure used to store a 2D vector; coordinates are of */ |
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/* the FT_Pos type. */ |
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/* */ |
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/* <Fields> */ |
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/* x :: The horizontal coordinate. */ |
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/* y :: The vertical coordinate. */ |
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/* */ |
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typedef struct FT_Vector_ |
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{ |
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FT_Pos x; |
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FT_Pos y; |
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} FT_Vector; |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* FT_BBox */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to hold an outline's bounding box, i.e., the */ |
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/* coordinates of its extrema in the horizontal and vertical */ |
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/* directions. */ |
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/* */ |
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/* <Fields> */ |
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/* xMin :: The horizontal minimum (left-most). */ |
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/* */ |
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/* yMin :: The vertical minimum (bottom-most). */ |
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/* */ |
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/* xMax :: The horizontal maximum (right-most). */ |
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/* */ |
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/* yMax :: The vertical maximum (top-most). */ |
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/* */ |
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typedef struct FT_BBox_ |
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{ |
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FT_Pos xMin, yMin; |
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FT_Pos xMax, yMax; |
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} FT_BBox; |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* FT_Pixel_Mode */ |
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/* */ |
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/* <Description> */ |
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/* An enumeration type used to describe the format of pixels in a */ |
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/* given bitmap. Note that additional formats may be added in the */ |
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/* future. */ |
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/* */ |
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/* <Values> */ |
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/* FT_PIXEL_MODE_NONE :: */ |
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/* Value 0 is reserved. */ |
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/* */ |
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/* FT_PIXEL_MODE_MONO :: */ |
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/* A monochrome bitmap, using 1 bit per pixel. Note that pixels */ |
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/* are stored in most-significant order (MSB), which means that */ |
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/* the left-most pixel in a byte has value 128. */ |
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/* */ |
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/* FT_PIXEL_MODE_GRAY :: */ |
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/* An 8-bit bitmap, generally used to represent anti-aliased glyph */ |
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/* images. Each pixel is stored in one byte. Note that the number */ |
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/* of value `gray' levels is stored in the `num_bytes' field of */ |
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/* the @FT_Bitmap structure (it generally is 256). */ |
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/* */ |
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/* FT_PIXEL_MODE_GRAY2 :: */ |
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/* A 2-bit/pixel bitmap, used to represent embedded anti-aliased */ |
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/* bitmaps in font files according to the OpenType specification. */ |
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/* We haven't found a single font using this format, however. */ |
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/* */ |
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/* FT_PIXEL_MODE_GRAY4 :: */ |
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/* A 4-bit/pixel bitmap, used to represent embedded anti-aliased */ |
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/* bitmaps in font files according to the OpenType specification. */ |
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/* We haven't found a single font using this format, however. */ |
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/* */ |
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/* FT_PIXEL_MODE_LCD :: */ |
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/* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */ |
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/* images used for display on LCD displays; the bitmap is three */ |
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/* times wider than the original glyph image. See also */ |
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/* @FT_RENDER_MODE_LCD. */ |
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/* */ |
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/* FT_PIXEL_MODE_LCD_V :: */ |
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/* An 8-bit bitmap, used to represent RGB or BGR decimated glyph */ |
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/* images used for display on rotated LCD displays; the bitmap */ |
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/* is three times taller than the original glyph image. See also */ |
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/* @FT_RENDER_MODE_LCD_V. */ |
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/* */ |
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typedef enum FT_Pixel_Mode_ |
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{ |
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FT_PIXEL_MODE_NONE = 0, |
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FT_PIXEL_MODE_MONO, |
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FT_PIXEL_MODE_GRAY, |
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FT_PIXEL_MODE_GRAY2, |
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FT_PIXEL_MODE_GRAY4, |
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FT_PIXEL_MODE_LCD, |
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FT_PIXEL_MODE_LCD_V, |
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FT_PIXEL_MODE_MAX /* do not remove */ |
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} FT_Pixel_Mode; |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* ft_pixel_mode_xxx */ |
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/* */ |
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/* <Description> */ |
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/* A list of deprecated constants. Use the corresponding */ |
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/* @FT_Pixel_Mode values instead. */ |
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/* */ |
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/* <Values> */ |
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/* ft_pixel_mode_none :: See @FT_PIXEL_MODE_NONE. */ |
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/* ft_pixel_mode_mono :: See @FT_PIXEL_MODE_MONO. */ |
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/* ft_pixel_mode_grays :: See @FT_PIXEL_MODE_GRAY. */ |
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/* ft_pixel_mode_pal2 :: See @FT_PIXEL_MODE_GRAY2. */ |
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/* ft_pixel_mode_pal4 :: See @FT_PIXEL_MODE_GRAY4. */ |
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/* */ |
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#define ft_pixel_mode_none FT_PIXEL_MODE_NONE |
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#define ft_pixel_mode_mono FT_PIXEL_MODE_MONO |
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#define ft_pixel_mode_grays FT_PIXEL_MODE_GRAY |
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#define ft_pixel_mode_pal2 FT_PIXEL_MODE_GRAY2 |
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#define ft_pixel_mode_pal4 FT_PIXEL_MODE_GRAY4 |
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/* */ |
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#if 0 |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* FT_Palette_Mode */ |
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/* */ |
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/* <Description> */ |
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/* THIS TYPE IS DEPRECATED. DO NOT USE IT! */ |
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/* */ |
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/* An enumeration type to describe the format of a bitmap palette, */ |
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/* used with ft_pixel_mode_pal4 and ft_pixel_mode_pal8. */ |
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/* */ |
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/* <Fields> */ |
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/* ft_palette_mode_rgb :: The palette is an array of 3-bytes RGB */ |
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/* records. */ |
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/* */ |
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/* ft_palette_mode_rgba :: The palette is an array of 4-bytes RGBA */ |
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/* records. */ |
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/* */ |
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/* <Note> */ |
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/* As ft_pixel_mode_pal2, pal4 and pal8 are currently unused by */ |
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/* FreeType, these types are not handled by the library itself. */ |
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/* */ |
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typedef enum FT_Palette_Mode_ |
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{ |
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ft_palette_mode_rgb = 0, |
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ft_palette_mode_rgba, |
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ft_palettte_mode_max /* do not remove */ |
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} FT_Palette_Mode; |
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/* */ |
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#endif |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* FT_Bitmap */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to describe a bitmap or pixmap to the raster. */ |
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/* Note that we now manage pixmaps of various depths through the */ |
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/* `pixel_mode' field. */ |
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/* */ |
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/* <Fields> */ |
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/* rows :: The number of bitmap rows. */ |
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/* */ |
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/* width :: The number of pixels in bitmap row. */ |
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/* */ |
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/* pitch :: The pitch's absolute value is the number of bytes */ |
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/* taken by one bitmap row, including padding. */ |
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/* However, the pitch is positive when the bitmap has */ |
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/* a `down' flow, and negative when it has an `up' */ |
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/* flow. In all cases, the pitch is an offset to add */ |
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/* to a bitmap pointer in order to go down one row. */ |
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/* */ |
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/* buffer :: A typeless pointer to the bitmap buffer. This */ |
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/* value should be aligned on 32-bit boundaries in */ |
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/* most cases. */ |
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/* */ |
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/* num_grays :: This field is only used with */ |
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/* @FT_PIXEL_MODE_GRAY; it gives the number of gray */ |
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/* levels used in the bitmap. */ |
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/* */ |
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/* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */ |
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/* See @FT_Pixel_Mode for possible values. */ |
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/* */ |
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/* palette_mode :: This field is intended for paletted pixel modes; */ |
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/* it indicates how the palette is stored. Not */ |
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/* used currently. */ |
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/* */ |
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/* palette :: A typeless pointer to the bitmap palette; this */ |
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/* field is intended for paletted pixel modes. Not */ |
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/* used currently. */ |
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/* */ |
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/* <Note> */ |
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/* For now, the only pixel modes supported by FreeType are mono and */ |
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/* grays. However, drivers might be added in the future to support */ |
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/* more `colorful' options. */ |
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/* */ |
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typedef struct FT_Bitmap_ |
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{ |
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int rows; |
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int width; |
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int pitch; |
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unsigned char* buffer; |
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short num_grays; |
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char pixel_mode; |
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char palette_mode; |
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void* palette; |
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} FT_Bitmap; |
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/*************************************************************************/ |
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/* */ |
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/* <Section> */ |
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/* outline_processing */ |
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/* */ |
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/*************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* FT_Outline */ |
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/* */ |
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/* <Description> */ |
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/* This structure is used to describe an outline to the scan-line */ |
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/* converter. */ |
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/* */ |
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/* <Fields> */ |
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/* n_contours :: The number of contours in the outline. */ |
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/* */ |
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/* n_points :: The number of points in the outline. */ |
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/* */ |
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/* points :: A pointer to an array of `n_points' @FT_Vector */ |
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/* elements, giving the outline's point coordinates. */ |
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/* */ |
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/* tags :: A pointer to an array of `n_points' chars, giving */ |
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/* each outline point's type. If bit 0 is unset, the */ |
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/* point is `off' the curve, i.e., a Bézier control */ |
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/* point, while it is `on' when set. */ |
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/* */ |
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/* Bit 1 is meaningful for `off' points only. If set, */ |
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/* it indicates a third-order Bézier arc control point; */ |
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/* and a second-order control point if unset. */ |
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/* */ |
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/* contours :: An array of `n_contours' shorts, giving the end */ |
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/* point of each contour within the outline. For */ |
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/* example, the first contour is defined by the points */ |
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/* `0' to `contours[0]', the second one is defined by */ |
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/* the points `contours[0]+1' to `contours[1]', etc. */ |
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/* */ |
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/* flags :: A set of bit flags used to characterize the outline */ |
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/* and give hints to the scan-converter and hinter on */ |
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/* how to convert/grid-fit it. See @FT_OUTLINE_FLAGS. */ |
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/* */ |
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typedef struct FT_Outline_ |
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{ |
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short n_contours; /* number of contours in glyph */ |
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short n_points; /* number of points in the glyph */ |
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FT_Vector* points; /* the outline's points */ |
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char* tags; /* the points flags */ |
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short* contours; /* the contour end points */ |
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int flags; /* outline masks */ |
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} FT_Outline; |
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/*************************************************************************/ |
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/* */ |
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/* <Enum> */ |
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/* FT_OUTLINE_FLAGS */ |
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/* */ |
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/* <Description> */ |
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/* A list of bit-field constants use for the flags in an outline's */ |
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/* `flags' field. */ |
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/* */ |
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/* <Values> */ |
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/* FT_OUTLINE_NONE :: Value 0 is reserved. */ |
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/* */ |
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/* FT_OUTLINE_OWNER :: If set, this flag indicates that the */ |
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/* outline's field arrays (i.e., */ |
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/* `points', `flags' & `contours') are */ |
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/* `owned' by the outline object, and */ |
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/* should thus be freed when it is */ |
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/* destroyed. */ |
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/* */ |
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/* FT_OUTLINE_EVEN_ODD_FILL :: By default, outlines are filled using */ |
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/* the non-zero winding rule. If set to */ |
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/* 1, the outline will be filled using */ |
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/* the even-odd fill rule (only works */ |
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/* with the smooth raster). */ |
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/* */ |
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/* FT_OUTLINE_REVERSE_FILL :: By default, outside contours of an */ |
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/* outline are oriented in clock-wise */ |
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/* direction, as defined in the TrueType */ |
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/* specification. This flag is set if */ |
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/* the outline uses the opposite */ |
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/* direction (typically for Type 1 */ |
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/* fonts). This flag is ignored by the */ |
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/* scan-converter. */ |
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/* */ |
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/* FT_OUTLINE_IGNORE_DROPOUTS :: By default, the scan converter will */ |
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/* try to detect drop-outs in an outline */ |
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/* and correct the glyph bitmap to */ |
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/* ensure consistent shape continuity. */ |
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/* If set, this flag hints the scan-line */ |
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/* converter to ignore such cases. */ |
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/* */ |
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/* FT_OUTLINE_HIGH_PRECISION :: This flag indicates that the */ |
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/* scan-line converter should try to */ |
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/* convert this outline to bitmaps with */ |
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/* the highest possible quality. It is */ |
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/* typically set for small character */ |
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/* sizes. Note that this is only a */ |
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/* hint, that might be completely */ |
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/* ignored by a given scan-converter. */ |
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/* */ |
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/* FT_OUTLINE_SINGLE_PASS :: This flag is set to force a given */ |
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/* scan-converter to only use a single */ |
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/* pass over the outline to render a */ |
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/* bitmap glyph image. Normally, it is */ |
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/* set for very large character sizes. */ |
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/* It is only a hint, that might be */ |
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/* completely ignored by a given */ |
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/* scan-converter. */ |
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/* */ |
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#define FT_OUTLINE_NONE 0x0 |
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#define FT_OUTLINE_OWNER 0x1 |
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#define FT_OUTLINE_EVEN_ODD_FILL 0x2 |
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#define FT_OUTLINE_REVERSE_FILL 0x4 |
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#define FT_OUTLINE_IGNORE_DROPOUTS 0x8 |
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#define FT_OUTLINE_HIGH_PRECISION 0x100 |
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#define FT_OUTLINE_SINGLE_PASS 0x200 |
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/************************************************************************* |
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* |
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* @enum: |
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* ft_outline_flags |
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* |
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* @description: |
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* These constants are deprecated. Please use the corresponding |
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* @FT_OUTLINE_FLAGS values. |
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* |
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* @values: |
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* ft_outline_none :: See @FT_OUTLINE_NONE. |
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* ft_outline_owner :: See @FT_OUTLINE_OWNER. |
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* ft_outline_even_odd_fill :: See @FT_OUTLINE_EVEN_ODD_FILL. |
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* ft_outline_reverse_fill :: See @FT_OUTLINE_REVERSE_FILL. |
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* ft_outline_ignore_dropouts :: See @FT_OUTLINE_IGNORE_DROPOUTS. |
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* ft_outline_high_precision :: See @FT_OUTLINE_HIGH_PRECISION. |
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* ft_outline_single_pass :: See @FT_OUTLINE_SINGLE_PASS. |
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*/ |
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#define ft_outline_none FT_OUTLINE_NONE |
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#define ft_outline_owner FT_OUTLINE_OWNER |
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#define ft_outline_even_odd_fill FT_OUTLINE_EVEN_ODD_FILL |
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#define ft_outline_reverse_fill FT_OUTLINE_REVERSE_FILL |
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#define ft_outline_ignore_dropouts FT_OUTLINE_IGNORE_DROPOUTS |
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#define ft_outline_high_precision FT_OUTLINE_HIGH_PRECISION |
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#define ft_outline_single_pass FT_OUTLINE_SINGLE_PASS |
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/* */ |
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#define FT_CURVE_TAG( flag ) ( flag & 3 ) |
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#define FT_CURVE_TAG_ON 1 |
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#define FT_CURVE_TAG_CONIC 0 |
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#define FT_CURVE_TAG_CUBIC 2 |
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#define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ |
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#define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ |
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#define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \ |
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FT_CURVE_TAG_TOUCH_Y ) |
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#define FT_Curve_Tag_On FT_CURVE_TAG_ON |
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#define FT_Curve_Tag_Conic FT_CURVE_TAG_CONIC |
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#define FT_Curve_Tag_Cubic FT_CURVE_TAG_CUBIC |
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#define FT_Curve_Tag_Touch_X FT_CURVE_TAG_TOUCH_X |
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#define FT_Curve_Tag_Touch_Y FT_CURVE_TAG_TOUCH_Y |
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/*************************************************************************/ |
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/* */ |
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/* <FuncType> */ |
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/* FT_Outline_MoveToFunc */ |
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/* */ |
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/* <Description> */ |
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/* A function pointer type used to describe the signature of a `move */ |
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/* to' function during outline walking/decomposition. */ |
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/* */ |
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/* A `move to' is emitted to start a new contour in an outline. */ |
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/* */ |
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/* <Input> */ |
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/* to :: A pointer to the target point of the `move to'. */ |
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/* */ |
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/* user :: A typeless pointer which is passed from the caller of the */ |
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/* decomposition function. */ |
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/* */ |
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/* <Return> */ |
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/* Error code. 0 means success. */ |
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/* */ |
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typedef int |
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(*FT_Outline_MoveToFunc)( const FT_Vector* to, |
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void* user ); |
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#define FT_Outline_MoveTo_Func FT_Outline_MoveToFunc |
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/*************************************************************************/ |
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/* */ |
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/* <FuncType> */ |
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/* FT_Outline_LineToFunc */ |
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/* */ |
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/* <Description> */ |
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/* A function pointer type used to describe the signature of a `line */ |
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/* to' function during outline walking/decomposition. */ |
|
/* */ |
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/* A `line to' is emitted to indicate a segment in the outline. */ |
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/* */ |
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/* <Input> */ |
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/* to :: A pointer to the target point of the `line to'. */ |
|
/* */ |
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/* user :: A typeless pointer which is passed from the caller of the */ |
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/* decomposition function. */ |
|
/* */ |
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/* <Return> */ |
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/* Error code. 0 means success. */ |
|
/* */ |
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typedef int |
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(*FT_Outline_LineToFunc)( const FT_Vector* to, |
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void* user ); |
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#define FT_Outline_LineTo_Func FT_Outline_LineToFunc |
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|
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/*************************************************************************/ |
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/* */ |
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/* <FuncType> */ |
|
/* FT_Outline_ConicToFunc */ |
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/* */ |
|
/* <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 */ |
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/* 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> */ |
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/* Error code. 0 means success. */ |
|
/* */ |
|
typedef int |
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(*FT_Outline_ConicToFunc)( const FT_Vector* control, |
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const FT_Vector* to, |
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void* user ); |
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|
#define FT_Outline_ConicTo_Func FT_Outline_ConicToFunc |
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|
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/*************************************************************************/ |
|
/* */ |
|
/* <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. */ |
|
/* */ |
|
typedef int |
|
(*FT_Outline_CubicToFunc)( const FT_Vector* control1, |
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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, */ |
|
/* 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. */ |
|
/* */ |
|
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 16bit compilers don't like 32bit 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; |
|
|
|
|
|
/*************************************************************************/ |
|
/* */ |
|
/* <Enum> */ |
|
/* ft_glyph_format_xxx */ |
|
/* */ |
|
/* <Description> */ |
|
/* A list of deprecated constants. Use the corresponding */ |
|
/* @FT_Glyph_Format values instead. */ |
|
/* */ |
|
/* <Values> */ |
|
/* ft_glyph_format_none :: See @FT_GLYPH_FORMAT_NONE. */ |
|
/* ft_glyph_format_composite :: See @FT_GLYPH_FORMAT_COMPOSITE. */ |
|
/* ft_glyph_format_bitmap :: See @FT_GLYPH_FORMAT_BITMAP. */ |
|
/* ft_glyph_format_outline :: See @FT_GLYPH_FORMAT_OUTLINE. */ |
|
/* ft_glyph_format_plotter :: See @FT_GLYPH_FORMAT_PLOTTER. */ |
|
/* */ |
|
#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 `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. */ |
|
/* */ |
|
/*************************************************************************/ |
|
|
|
|
|
/*************************************************************************/ |
|
/* */ |
|
/* <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; |
|
|
|
|
|
/*************************************************************************/ |
|
/* */ |
|
/* <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. */ |
|
/* */ |
|
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> */ |
|
/* 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 |
|
(*FT_Raster_BitTest_Func)( int y, |
|
int x, |
|
void* user ); |
|
|
|
|
|
/*************************************************************************/ |
|
/* */ |
|
/* <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. */ |
|
/* */ |
|
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. */ |
|
/* */ |
|
/* 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. */ |
|
/* */ |
|
#define FT_RASTER_FLAG_DEFAULT 0x0 |
|
#define FT_RASTER_FLAG_AA 0x1 |
|
#define FT_RASTER_FLAG_DIRECT 0x2 |
|
#define FT_RASTER_FLAG_CLIP 0x4 |
|
|
|
/* deprecated */ |
|
#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 :: 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. */ |
|
/* */ |
|
typedef struct FT_Raster_Params_ |
|
{ |
|
const FT_Bitmap* target; |
|
const void* source; |
|
int flags; |
|
FT_SpanFunc gray_spans; |
|
FT_SpanFunc black_spans; |
|
FT_Raster_BitTest_Func bit_test; /* doesn't work! */ |
|
FT_Raster_BitSet_Func bit_set; /* doesn't work! */ |
|
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> */ |
|
/* 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 an @FT_Raster_Params structure used to */ |
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/* store the rendering parameters. */ |
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/* */ |
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/* <Return> */ |
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/* Error code. 0 means success. */ |
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/* */ |
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/* <Note> */ |
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/* The exact format of the source image depends on the raster's glyph */ |
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/* format defined in its @FT_Raster_Funcs structure. It can be an */ |
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/* @FT_Outline or anything else in order to support a large array of */ |
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/* glyph formats. */ |
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/* */ |
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/* Note also that the render function can fail and return a */ |
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/* `FT_Err_Unimplemented_Feature' error code if the raster used does */ |
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/* not support direct composition. */ |
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/* */ |
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/* XXX: For now, the standard raster doesn't support direct */ |
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/* composition but this should change for the final release (see */ |
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/* the files `demos/src/ftgrays.c' and `demos/src/ftgrays2.c' */ |
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/* for examples of distinct implementations which support direct */ |
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/* composition). */ |
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/* */ |
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typedef int |
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(*FT_Raster_RenderFunc)( FT_Raster raster, |
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const FT_Raster_Params* params ); |
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|
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#define FT_Raster_Render_Func FT_Raster_RenderFunc |
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|
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* FT_Raster_Funcs */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to describe a given raster class to the library. */ |
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/* */ |
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/* <Fields> */ |
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/* glyph_format :: The supported glyph format for this raster. */ |
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/* */ |
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/* raster_new :: The raster constructor. */ |
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/* */ |
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/* raster_reset :: Used to reset the render pool within the raster. */ |
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/* */ |
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/* raster_render :: A function to render a glyph into a given bitmap. */ |
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/* */ |
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/* raster_done :: The raster destructor. */ |
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/* */ |
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typedef struct FT_Raster_Funcs_ |
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{ |
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FT_Glyph_Format glyph_format; |
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FT_Raster_NewFunc raster_new; |
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FT_Raster_ResetFunc raster_reset; |
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FT_Raster_SetModeFunc raster_set_mode; |
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FT_Raster_RenderFunc raster_render; |
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FT_Raster_DoneFunc raster_done; |
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|
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} FT_Raster_Funcs; |
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/* */ |
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FT_END_HEADER |
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#endif /* __FTIMAGE_H__ */ |
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/* END */ |
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/* Local Variables: */ |
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/* coding: utf-8 */ |
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/* End: */
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