1215 lines
75 KiB
C
1215 lines
75 KiB
C
/***************************************************************************/
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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 1996-2015 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 used to store vectorial coordinates. Depending */
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/* on the context, these can represent distances in integer font */
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/* units, or 16.16, or 26.6 fixed-point 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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/* <Note> */
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/* The bounding box is specified with the coordinates of the lower */
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/* left and the upper right corner. In PostScript, those values are */
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/* often called (llx,lly) and (urx,ury), respectively. */
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/* */
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/* If `yMin' is negative, this value gives the glyph's descender. */
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/* Otherwise, the glyph doesn't descend below the baseline. */
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/* Similarly, if `ymax' is positive, this value gives the glyph's */
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/* ascender. */
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/* */
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/* `xMin' gives the horizontal distance from the glyph's origin to */
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/* the left edge of the glyph's bounding box. If `xMin' is negative, */
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/* the glyph extends to the left of the origin. */
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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 `gray' levels is stored in the `num_grays' field of the */
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/* @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 per pixel bitmap, used to represent embedded */
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/* anti-aliased bitmaps in font files according to the OpenType */
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/* specification. We haven't found a single font using this */
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/* format, however. */
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/* */
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/* FT_PIXEL_MODE_GRAY4 :: */
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/* A 4-bit per pixel bitmap, representing 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, representing RGB or BGR decimated glyph images */
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/* used for display on LCD displays; the bitmap is three times */
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/* 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, representing RGB or BGR decimated glyph images */
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/* used for display on rotated LCD displays; the bitmap is three */
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/* 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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/* FT_PIXEL_MODE_BGRA :: */
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/* An image with four 8-bit channels per pixel, representing a */
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/* color image (such as emoticons) with alpha channel. For each */
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/* pixel, the format is BGRA, which means, the blue channel comes */
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/* first in memory. The color channels are pre-multiplied and in */
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/* the sRGB colorspace. For example, full red at half-translucent */
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/* opacity will be represented as `00,00,80,80', not `00,00,FF,80'. */
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/* See also @FT_LOAD_COLOR. */
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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_BGRA,
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FT_PIXEL_MODE_MAX /* do not remove */
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} FT_Pixel_Mode;
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/* these constants are deprecated; use the corresponding `FT_Pixel_Mode' */
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/* values instead. */
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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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/* */
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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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/* Note that `padding' means the alignment of a */
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/* bitmap to a byte border, and FreeType functions */
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/* normally align to the smallest possible integer */
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/* value. */
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/* */
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/* For the B/W rasterizer, `pitch' is always an even */
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/* number. */
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/* */
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/* To change the pitch of a bitmap (say, to make it a */
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/* multiple of 4), use @FT_Bitmap_Convert. */
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/* Alternatively, you might use callback functions to */
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/* directly render to the application's surface; see */
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/* the file `example2.cpp' in the tutorial for a */
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/* demonstration. */
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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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typedef struct FT_Bitmap_
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{
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unsigned int rows;
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unsigned int width;
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int pitch;
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unsigned char* buffer;
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unsigned short num_grays;
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unsigned char pixel_mode;
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unsigned 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. */
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/* */
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/* If bit~0 is unset, the point is `off' the curve, */
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/* i.e., a Bézier control point, while it is `on' if */
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/* 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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/* If bit~2 is set, bits 5-7 contain the drop-out mode */
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/* (as defined in the OpenType specification; the value */
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/* is the same as the argument to the SCANMODE */
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/* instruction). */
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/* */
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/* Bits 3 and~4 are reserved for internal purposes. */
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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_XXX. */
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/* */
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/* <Note> */
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/* The B/W rasterizer only checks bit~2 in the `tags' array for the */
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/* first point of each contour. The drop-out mode as given with */
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/* @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and */
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/* @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden. */
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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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/* Following limits must be consistent with */
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/* FT_Outline.{n_contours,n_points} */
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#define FT_OUTLINE_CONTOURS_MAX SHRT_MAX
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#define FT_OUTLINE_POINTS_MAX SHRT_MAX
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/*************************************************************************/
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/* */
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/* <Enum> */
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/* FT_OUTLINE_XXX */
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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 :: */
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/* Value~0 is reserved. */
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/* */
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/* FT_OUTLINE_OWNER :: */
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/* If set, this flag indicates that the outline's field arrays */
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/* (i.e., `points', `flags', and `contours') are `owned' by the */
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/* outline object, and should thus be freed when it is destroyed. */
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/* */
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/* FT_OUTLINE_EVEN_ODD_FILL :: */
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/* By default, outlines are filled using the non-zero winding rule. */
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/* If set to 1, the outline will be filled using the even-odd fill */
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/* rule (only works with the smooth rasterizer). */
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/* */
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/* FT_OUTLINE_REVERSE_FILL :: */
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/* By default, outside contours of an outline are oriented in */
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/* clock-wise direction, as defined in the TrueType specification. */
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/* This flag is set if the outline uses the opposite direction */
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/* (typically for Type~1 fonts). This flag is ignored by the scan */
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/* converter. */
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/* */
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/* FT_OUTLINE_IGNORE_DROPOUTS :: */
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/* By default, the scan converter will try to detect drop-outs in */
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/* an outline and correct the glyph bitmap to ensure consistent */
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/* shape continuity. If set, this flag hints the scan-line */
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/* converter to ignore such cases. See below for more information. */
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/* */
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/* FT_OUTLINE_SMART_DROPOUTS :: */
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/* Select smart dropout control. If unset, use simple dropout */
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/* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See */
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/* below for more information. */
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/* */
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/* FT_OUTLINE_INCLUDE_STUBS :: */
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/* If set, turn pixels on for `stubs', otherwise exclude them. */
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/* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See below for */
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/* more information. */
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/* */
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/* FT_OUTLINE_HIGH_PRECISION :: */
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/* This flag indicates that the scan-line converter should try to */
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/* convert this outline to bitmaps with the highest possible */
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/* quality. It is typically set for small character sizes. Note */
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/* that this is only a hint that might be completely ignored by a */
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/* given scan-converter. */
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/* */
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/* FT_OUTLINE_SINGLE_PASS :: */
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/* This flag is set to force a given scan-converter to only use a */
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/* single pass over the outline to render a bitmap glyph image. */
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/* Normally, it is set for very large character sizes. It is only */
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/* a hint that might be completely ignored by a given */
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/* scan-converter. */
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/* */
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/* <Note> */
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/* The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */
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/* and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth */
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/* rasterizer. */
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/* */
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/* There exists a second mechanism to pass the drop-out mode to the */
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/* B/W rasterizer; see the `tags' field in @FT_Outline. */
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/* */
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/* Please refer to the description of the `SCANTYPE' instruction in */
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/* the OpenType specification (in file `ttinst1.doc') how simple */
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/* drop-outs, smart drop-outs, and stubs are defined. */
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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_SMART_DROPOUTS 0x10
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#define FT_OUTLINE_INCLUDE_STUBS 0x20
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#define FT_OUTLINE_HIGH_PRECISION 0x100
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#define FT_OUTLINE_SINGLE_PASS 0x200
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/* these constants are deprecated; use the corresponding */
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/* `FT_OUTLINE_XXX' values instead */
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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_HAS_SCANMODE 4
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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> */
|
|
/* Error code. 0~means success. */
|
|
/* */
|
|
typedef int
|
|
(*FT_Outline_MoveToFunc)( const FT_Vector* to,
|
|
void* user );
|
|
|
|
#define FT_Outline_MoveTo_Func FT_Outline_MoveToFunc
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_Outline_LineToFunc */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function pointer type used to describe the signature of a `line */
|
|
/* to' function during outline walking/decomposition. */
|
|
/* */
|
|
/* A `line to' is emitted to indicate a segment in the outline. */
|
|
/* */
|
|
/* <Input> */
|
|
/* to :: A pointer to the target point of the `line to'. */
|
|
/* */
|
|
/* user :: A typeless pointer, which is passed from the caller of the */
|
|
/* decomposition function. */
|
|
/* */
|
|
/* <Return> */
|
|
/* Error code. 0~means success. */
|
|
/* */
|
|
typedef int
|
|
(*FT_Outline_LineToFunc)( const FT_Vector* to,
|
|
void* user );
|
|
|
|
#define FT_Outline_LineTo_Func FT_Outline_LineToFunc
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_Outline_ConicToFunc */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function pointer type used to describe the signature of a `conic */
|
|
/* to' function during outline walking or decomposition. */
|
|
/* */
|
|
/* A `conic to' is emitted to indicate a second-order Bézier arc in */
|
|
/* the outline. */
|
|
/* */
|
|
/* <Input> */
|
|
/* control :: An intermediate control point between the last position */
|
|
/* and the new target in `to'. */
|
|
/* */
|
|
/* to :: A pointer to the target end point of the conic arc. */
|
|
/* */
|
|
/* user :: A typeless pointer, which is passed from the caller of */
|
|
/* the decomposition function. */
|
|
/* */
|
|
/* <Return> */
|
|
/* Error code. 0~means success. */
|
|
/* */
|
|
typedef int
|
|
(*FT_Outline_ConicToFunc)( const FT_Vector* control,
|
|
const FT_Vector* to,
|
|
void* user );
|
|
|
|
#define FT_Outline_ConicTo_Func FT_Outline_ConicToFunc
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_Outline_CubicToFunc */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function pointer type used to describe the signature of a `cubic */
|
|
/* to' function during outline walking or decomposition. */
|
|
/* */
|
|
/* A `cubic to' is emitted to indicate a third-order Bézier arc. */
|
|
/* */
|
|
/* <Input> */
|
|
/* control1 :: A pointer to the first Bézier control point. */
|
|
/* */
|
|
/* control2 :: A pointer to the second Bézier control point. */
|
|
/* */
|
|
/* to :: A pointer to the target end point. */
|
|
/* */
|
|
/* user :: A typeless pointer, which is passed from the caller of */
|
|
/* the decomposition function. */
|
|
/* */
|
|
/* <Return> */
|
|
/* Error code. 0~means success. */
|
|
/* */
|
|
typedef int
|
|
(*FT_Outline_CubicToFunc)( const FT_Vector* control1,
|
|
const FT_Vector* control2,
|
|
const FT_Vector* to,
|
|
void* user );
|
|
|
|
#define FT_Outline_CubicTo_Func FT_Outline_CubicToFunc
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Outline_Funcs */
|
|
/* */
|
|
/* <Description> */
|
|
/* A structure to hold various function pointers used during outline */
|
|
/* decomposition in order to emit segments, conic, and cubic Béziers. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* move_to :: The `move to' emitter. */
|
|
/* */
|
|
/* line_to :: The segment emitter. */
|
|
/* */
|
|
/* conic_to :: The second-order Bézier arc emitter. */
|
|
/* */
|
|
/* cubic_to :: The third-order Bézier arc emitter. */
|
|
/* */
|
|
/* shift :: The shift that is applied to coordinates before they */
|
|
/* are sent to the emitter. */
|
|
/* */
|
|
/* delta :: The delta that is applied to coordinates before they */
|
|
/* are sent to the emitter, but after the shift. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The point coordinates sent to the emitters are the transformed */
|
|
/* version of the original coordinates (this is important for high */
|
|
/* accuracy during scan-conversion). The transformation is simple: */
|
|
/* */
|
|
/* { */
|
|
/* x' = (x << shift) - delta */
|
|
/* y' = (x << shift) - delta */
|
|
/* } */
|
|
/* */
|
|
/* Set the values of `shift' and `delta' to~0 to get the original */
|
|
/* point coordinates. */
|
|
/* */
|
|
typedef struct FT_Outline_Funcs_
|
|
{
|
|
FT_Outline_MoveToFunc move_to;
|
|
FT_Outline_LineToFunc line_to;
|
|
FT_Outline_ConicToFunc conic_to;
|
|
FT_Outline_CubicToFunc cubic_to;
|
|
|
|
int shift;
|
|
FT_Pos delta;
|
|
|
|
} FT_Outline_Funcs;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Section> */
|
|
/* basic_types */
|
|
/* */
|
|
/*************************************************************************/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Macro> */
|
|
/* FT_IMAGE_TAG */
|
|
/* */
|
|
/* <Description> */
|
|
/* This macro converts four-letter tags to an unsigned long type. */
|
|
/* */
|
|
/* <Note> */
|
|
/* Since many 16-bit compilers don't like 32-bit enumerations, you */
|
|
/* should redefine this macro in case of problems to something like */
|
|
/* this: */
|
|
/* */
|
|
/* { */
|
|
/* #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */
|
|
/* } */
|
|
/* */
|
|
/* to get a simple enumeration without assigning special numbers. */
|
|
/* */
|
|
#ifndef FT_IMAGE_TAG
|
|
#define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \
|
|
value = ( ( (unsigned long)_x1 << 24 ) | \
|
|
( (unsigned long)_x2 << 16 ) | \
|
|
( (unsigned long)_x3 << 8 ) | \
|
|
(unsigned long)_x4 )
|
|
#endif /* FT_IMAGE_TAG */
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Enum> */
|
|
/* FT_Glyph_Format */
|
|
/* */
|
|
/* <Description> */
|
|
/* An enumeration type used to describe the format of a given glyph */
|
|
/* image. Note that this version of FreeType only supports two image */
|
|
/* formats, even though future font drivers will be able to register */
|
|
/* their own format. */
|
|
/* */
|
|
/* <Values> */
|
|
/* FT_GLYPH_FORMAT_NONE :: */
|
|
/* The value~0 is reserved. */
|
|
/* */
|
|
/* FT_GLYPH_FORMAT_COMPOSITE :: */
|
|
/* The glyph image is a composite of several other images. This */
|
|
/* format is _only_ used with @FT_LOAD_NO_RECURSE, and is used to */
|
|
/* report compound glyphs (like accented characters). */
|
|
/* */
|
|
/* FT_GLYPH_FORMAT_BITMAP :: */
|
|
/* The glyph image is a bitmap, and can be described as an */
|
|
/* @FT_Bitmap. You generally need to access the `bitmap' field of */
|
|
/* the @FT_GlyphSlotRec structure to read it. */
|
|
/* */
|
|
/* FT_GLYPH_FORMAT_OUTLINE :: */
|
|
/* The glyph image is a vectorial outline made of line segments */
|
|
/* and Bézier arcs; it can be described as an @FT_Outline; you */
|
|
/* generally want to access the `outline' field of the */
|
|
/* @FT_GlyphSlotRec structure to read it. */
|
|
/* */
|
|
/* FT_GLYPH_FORMAT_PLOTTER :: */
|
|
/* The glyph image is a vectorial path with no inside and outside */
|
|
/* contours. Some Type~1 fonts, like those in the Hershey family, */
|
|
/* contain glyphs in this format. These are described as */
|
|
/* @FT_Outline, but FreeType isn't currently capable of rendering */
|
|
/* them correctly. */
|
|
/* */
|
|
typedef enum FT_Glyph_Format_
|
|
{
|
|
FT_IMAGE_TAG( FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ),
|
|
|
|
FT_IMAGE_TAG( FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ),
|
|
FT_IMAGE_TAG( FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ),
|
|
FT_IMAGE_TAG( FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ),
|
|
FT_IMAGE_TAG( FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' )
|
|
|
|
} FT_Glyph_Format;
|
|
|
|
|
|
/* these constants are deprecated; use the corresponding */
|
|
/* `FT_Glyph_Format' values instead. */
|
|
#define ft_glyph_format_none FT_GLYPH_FORMAT_NONE
|
|
#define ft_glyph_format_composite FT_GLYPH_FORMAT_COMPOSITE
|
|
#define ft_glyph_format_bitmap FT_GLYPH_FORMAT_BITMAP
|
|
#define ft_glyph_format_outline FT_GLYPH_FORMAT_OUTLINE
|
|
#define ft_glyph_format_plotter FT_GLYPH_FORMAT_PLOTTER
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/***** *****/
|
|
/***** R A S T E R D E F I N I T I O N S *****/
|
|
/***** *****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* A raster is a scan converter, in charge of rendering an outline into */
|
|
/* a a bitmap. This section contains the public API for rasters. */
|
|
/* */
|
|
/* Note that in FreeType 2, all rasters are now encapsulated within */
|
|
/* specific modules called `renderers'. See `ftrender.h' for more */
|
|
/* details on renderers. */
|
|
/* */
|
|
/*************************************************************************/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Section> */
|
|
/* raster */
|
|
/* */
|
|
/* <Title> */
|
|
/* Scanline Converter */
|
|
/* */
|
|
/* <Abstract> */
|
|
/* How vectorial outlines are converted into bitmaps and pixmaps. */
|
|
/* */
|
|
/* <Description> */
|
|
/* This section contains technical definitions. */
|
|
/* */
|
|
/* <Order> */
|
|
/* FT_Raster */
|
|
/* FT_Span */
|
|
/* FT_SpanFunc */
|
|
/* */
|
|
/* FT_Raster_Params */
|
|
/* FT_RASTER_FLAG_XXX */
|
|
/* */
|
|
/* FT_Raster_NewFunc */
|
|
/* FT_Raster_DoneFunc */
|
|
/* FT_Raster_ResetFunc */
|
|
/* FT_Raster_SetModeFunc */
|
|
/* FT_Raster_RenderFunc */
|
|
/* FT_Raster_Funcs */
|
|
/* */
|
|
/*************************************************************************/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Type> */
|
|
/* FT_Raster */
|
|
/* */
|
|
/* <Description> */
|
|
/* An opaque handle (pointer) to a raster object. Each object can be */
|
|
/* used independently to convert an outline into a bitmap or pixmap. */
|
|
/* */
|
|
typedef struct FT_RasterRec_* FT_Raster;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Span */
|
|
/* */
|
|
/* <Description> */
|
|
/* A structure used to model a single span of gray pixels when */
|
|
/* rendering an anti-aliased bitmap. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* x :: The span's horizontal start position. */
|
|
/* */
|
|
/* len :: The span's length in pixels. */
|
|
/* */
|
|
/* coverage :: The span color/coverage, ranging from 0 (background) */
|
|
/* to 255 (foreground). */
|
|
/* */
|
|
/* <Note> */
|
|
/* This structure is used by the span drawing callback type named */
|
|
/* @FT_SpanFunc that takes the y~coordinate of the span as a */
|
|
/* parameter. */
|
|
/* */
|
|
/* The coverage value is always between 0 and 255. If you want less */
|
|
/* gray values, the callback function has to reduce them. */
|
|
/* */
|
|
typedef struct FT_Span_
|
|
{
|
|
short x;
|
|
unsigned short len;
|
|
unsigned char coverage;
|
|
|
|
} FT_Span;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_SpanFunc */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function used as a call-back by the anti-aliased renderer in */
|
|
/* order to let client applications draw themselves the gray pixel */
|
|
/* spans on each scan line. */
|
|
/* */
|
|
/* <Input> */
|
|
/* y :: The scanline's y~coordinate. */
|
|
/* */
|
|
/* count :: The number of spans to draw on this scanline. */
|
|
/* */
|
|
/* spans :: A table of `count' spans to draw on the scanline. */
|
|
/* */
|
|
/* user :: User-supplied data that is passed to the callback. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This callback allows client applications to directly render the */
|
|
/* gray spans of the anti-aliased bitmap to any kind of surfaces. */
|
|
/* */
|
|
/* This can be used to write anti-aliased outlines directly to a */
|
|
/* given background bitmap, and even perform translucency. */
|
|
/* */
|
|
/* Note that the `count' field cannot be greater than a fixed value */
|
|
/* defined by the `FT_MAX_GRAY_SPANS' configuration macro in */
|
|
/* `ftoption.h'. By default, this value is set to~32, which means */
|
|
/* that if there are more than 32~spans on a given scanline, the */
|
|
/* callback is called several times with the same `y' parameter in */
|
|
/* order to draw all callbacks. */
|
|
/* */
|
|
/* Otherwise, the callback is only called once per scan-line, and */
|
|
/* only for those scanlines that do have `gray' pixels on them. */
|
|
/* */
|
|
typedef void
|
|
(*FT_SpanFunc)( int y,
|
|
int count,
|
|
const FT_Span* spans,
|
|
void* user );
|
|
|
|
#define FT_Raster_Span_Func FT_SpanFunc
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_Raster_BitTest_Func */
|
|
/* */
|
|
/* <Description> */
|
|
/* Deprecated, unimplemented. */
|
|
/* */
|
|
typedef int
|
|
(*FT_Raster_BitTest_Func)( int y,
|
|
int x,
|
|
void* user );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_Raster_BitSet_Func */
|
|
/* */
|
|
/* <Description> */
|
|
/* Deprecated, unimplemented. */
|
|
/* */
|
|
typedef void
|
|
(*FT_Raster_BitSet_Func)( int y,
|
|
int x,
|
|
void* user );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Enum> */
|
|
/* FT_RASTER_FLAG_XXX */
|
|
/* */
|
|
/* <Description> */
|
|
/* A list of bit flag constants as used in the `flags' field of a */
|
|
/* @FT_Raster_Params structure. */
|
|
/* */
|
|
/* <Values> */
|
|
/* FT_RASTER_FLAG_DEFAULT :: This value is 0. */
|
|
/* */
|
|
/* FT_RASTER_FLAG_AA :: This flag is set to indicate that an */
|
|
/* anti-aliased glyph image should be */
|
|
/* generated. Otherwise, it will be */
|
|
/* monochrome (1-bit). */
|
|
/* */
|
|
/* FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */
|
|
/* rendering. In this mode, client */
|
|
/* applications must provide their own span */
|
|
/* callback. This lets them directly */
|
|
/* draw or compose over an existing bitmap. */
|
|
/* If this bit is not set, the target */
|
|
/* pixmap's buffer _must_ be zeroed before */
|
|
/* rendering. */
|
|
/* */
|
|
/* Direct rendering is only possible with */
|
|
/* anti-aliased glyphs. */
|
|
/* */
|
|
/* FT_RASTER_FLAG_CLIP :: This flag is only used in direct */
|
|
/* rendering mode. If set, the output will */
|
|
/* be clipped to a box specified in the */
|
|
/* `clip_box' field of the */
|
|
/* @FT_Raster_Params structure. */
|
|
/* */
|
|
/* Note that by default, the glyph bitmap */
|
|
/* is clipped to the target pixmap, except */
|
|
/* in direct rendering mode where all spans */
|
|
/* are generated if no clipping box is set. */
|
|
/* */
|
|
#define FT_RASTER_FLAG_DEFAULT 0x0
|
|
#define FT_RASTER_FLAG_AA 0x1
|
|
#define FT_RASTER_FLAG_DIRECT 0x2
|
|
#define FT_RASTER_FLAG_CLIP 0x4
|
|
|
|
/* these constants are deprecated; use the corresponding */
|
|
/* `FT_RASTER_FLAG_XXX' values instead */
|
|
#define ft_raster_flag_default FT_RASTER_FLAG_DEFAULT
|
|
#define ft_raster_flag_aa FT_RASTER_FLAG_AA
|
|
#define ft_raster_flag_direct FT_RASTER_FLAG_DIRECT
|
|
#define ft_raster_flag_clip FT_RASTER_FLAG_CLIP
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Raster_Params */
|
|
/* */
|
|
/* <Description> */
|
|
/* A structure to hold the arguments used by a raster's render */
|
|
/* function. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* target :: The target bitmap. */
|
|
/* */
|
|
/* source :: A pointer to the source glyph image (e.g., an */
|
|
/* @FT_Outline). */
|
|
/* */
|
|
/* flags :: The rendering flags. */
|
|
/* */
|
|
/* gray_spans :: The gray span drawing callback. */
|
|
/* */
|
|
/* black_spans :: Unused. */
|
|
/* */
|
|
/* bit_test :: Unused. */
|
|
/* */
|
|
/* bit_set :: Unused. */
|
|
/* */
|
|
/* user :: User-supplied data that is passed to each drawing */
|
|
/* callback. */
|
|
/* */
|
|
/* clip_box :: An optional clipping box. It is only used in */
|
|
/* direct rendering mode. Note that coordinates here */
|
|
/* should be expressed in _integer_ pixels (and not in */
|
|
/* 26.6 fixed-point units). */
|
|
/* */
|
|
/* <Note> */
|
|
/* An anti-aliased glyph bitmap is drawn if the @FT_RASTER_FLAG_AA */
|
|
/* bit flag is set in the `flags' field, otherwise a monochrome */
|
|
/* bitmap is generated. */
|
|
/* */
|
|
/* If the @FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */
|
|
/* raster will call the `gray_spans' callback to draw gray pixel */
|
|
/* spans. This allows direct composition over a pre-existing bitmap */
|
|
/* through user-provided callbacks to perform the span drawing and */
|
|
/* composition. Not supported by the monochrome rasterizer. */
|
|
/* */
|
|
typedef struct FT_Raster_Params_
|
|
{
|
|
const FT_Bitmap* target;
|
|
const void* source;
|
|
int flags;
|
|
FT_SpanFunc gray_spans;
|
|
FT_SpanFunc black_spans; /* unused */
|
|
FT_Raster_BitTest_Func bit_test; /* unused */
|
|
FT_Raster_BitSet_Func bit_set; /* unused */
|
|
void* user;
|
|
FT_BBox clip_box;
|
|
|
|
} FT_Raster_Params;
|
|
|
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* FT_Raster_NewFunc */
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/* */
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/* <Description> */
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/* A function used to create a new raster object. */
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/* */
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/* <Input> */
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/* memory :: A handle to the memory allocator. */
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/* */
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/* <Output> */
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/* raster :: A handle to the new raster object. */
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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 `memory' parameter is a typeless pointer in order to avoid */
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/* un-wanted dependencies on the rest of the FreeType code. In */
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/* practice, it is an @FT_Memory object, i.e., a handle to the */
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/* standard FreeType memory allocator. However, this field can be */
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/* completely ignored by a given raster implementation. */
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/* */
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typedef int
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(*FT_Raster_NewFunc)( void* memory,
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FT_Raster* raster );
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#define FT_Raster_New_Func FT_Raster_NewFunc
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* FT_Raster_DoneFunc */
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/* */
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/* <Description> */
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/* A function used to destroy a given raster object. */
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/* */
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/* <Input> */
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/* raster :: A handle to the raster object. */
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/* */
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typedef void
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(*FT_Raster_DoneFunc)( FT_Raster raster );
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#define FT_Raster_Done_Func FT_Raster_DoneFunc
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* FT_Raster_ResetFunc */
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/* */
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/* <Description> */
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/* FreeType used to provide an area of memory called the `render */
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/* pool' available to all registered rasters. This was not thread */
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/* safe however and now FreeType never allocates this pool. NULL */
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/* is always passed in as pool_base. */
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/* */
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/* This function is called each time the render pool changes, or just */
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/* after a new raster object is created. */
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/* */
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/* <Input> */
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/* raster :: A handle to the new raster object. */
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/* */
|
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/* pool_base :: The address in memory of the render pool. */
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/* */
|
|
/* pool_size :: The size in bytes of the render pool. */
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/* */
|
|
/* <Note> */
|
|
/* Rasters should ignore the render pool and rely on dynamic or stack */
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/* allocation if they want to (a handle to the memory allocator is */
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/* passed to the raster constructor). */
|
|
/* */
|
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typedef void
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(*FT_Raster_ResetFunc)( FT_Raster raster,
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unsigned char* pool_base,
|
|
unsigned long pool_size );
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#define FT_Raster_Reset_Func FT_Raster_ResetFunc
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/*************************************************************************/
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|
/* */
|
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/* <FuncType> */
|
|
/* FT_Raster_SetModeFunc */
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|
/* */
|
|
/* <Description> */
|
|
/* This function is a generic facility to change modes or attributes */
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|
/* in a given raster. This can be used for debugging purposes, or */
|
|
/* simply to allow implementation-specific `features' in a given */
|
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/* raster module. */
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|
/* */
|
|
/* <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 );
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|
|
|
#define FT_Raster_Set_Mode_Func FT_Raster_SetModeFunc
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|
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/*************************************************************************/
|
|
/* */
|
|
/* <FuncType> */
|
|
/* FT_Raster_RenderFunc */
|
|
/* */
|
|
/* <Description> */
|
|
/* Invoke a given raster to scan-convert a given glyph image into a */
|
|
/* target bitmap. */
|
|
/* */
|
|
/* <Input> */
|
|
/* raster :: A handle to the raster object. */
|
|
/* */
|
|
/* params :: A pointer to an @FT_Raster_Params structure used to */
|
|
/* store the rendering parameters. */
|
|
/* */
|
|
/* <Return> */
|
|
/* Error code. 0~means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The exact format of the source image depends on the raster's glyph */
|
|
/* format defined in its @FT_Raster_Funcs structure. It can be an */
|
|
/* @FT_Outline or anything else in order to support a large array of */
|
|
/* glyph formats. */
|
|
/* */
|
|
/* Note also that the render function can fail and return a */
|
|
/* `FT_Err_Unimplemented_Feature' error code if the raster used does */
|
|
/* not support direct composition. */
|
|
/* */
|
|
/* XXX: For now, the standard raster doesn't support direct */
|
|
/* composition but this should change for the final release (see */
|
|
/* the files `demos/src/ftgrays.c' and `demos/src/ftgrays2.c' */
|
|
/* for examples of distinct implementations that support direct */
|
|
/* composition). */
|
|
/* */
|
|
typedef int
|
|
(*FT_Raster_RenderFunc)( FT_Raster raster,
|
|
const FT_Raster_Params* params );
|
|
|
|
#define FT_Raster_Render_Func FT_Raster_RenderFunc
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Raster_Funcs */
|
|
/* */
|
|
/* <Description> */
|
|
/* A structure used to describe a given raster class to the library. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* glyph_format :: The supported glyph format for this raster. */
|
|
/* */
|
|
/* raster_new :: The raster constructor. */
|
|
/* */
|
|
/* raster_reset :: Used to reset the render pool within the raster. */
|
|
/* */
|
|
/* raster_render :: A function to render a glyph into a given bitmap. */
|
|
/* */
|
|
/* raster_done :: The raster destructor. */
|
|
/* */
|
|
typedef struct FT_Raster_Funcs_
|
|
{
|
|
FT_Glyph_Format glyph_format;
|
|
FT_Raster_NewFunc raster_new;
|
|
FT_Raster_ResetFunc raster_reset;
|
|
FT_Raster_SetModeFunc raster_set_mode;
|
|
FT_Raster_RenderFunc raster_render;
|
|
FT_Raster_DoneFunc raster_done;
|
|
|
|
} FT_Raster_Funcs;
|
|
|
|
/* */
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __FTIMAGE_H__ */
|
|
|
|
|
|
/* END */
|
|
|
|
|
|
/* Local Variables: */
|
|
/* coding: utf-8 */
|
|
/* End: */
|