forked from minhngoc25a/freetype2
241 lines
14 KiB
C
241 lines
14 KiB
C
/***************************************************************************/
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/* */
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/* ftbitmap.h */
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/* */
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/* FreeType utility functions for bitmaps (specification). */
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/* */
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/* Copyright 2004-2017 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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#ifndef FTBITMAP_H_
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#define FTBITMAP_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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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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/* bitmap_handling */
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/* */
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/* <Title> */
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/* Bitmap Handling */
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/* */
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/* <Abstract> */
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/* Handling FT_Bitmap objects. */
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/* */
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/* <Description> */
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/* This section contains functions for handling @FT_Bitmap objects. */
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/* Note that none of the functions changes the bitmap's `flow' (as */
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/* indicated by the sign of the `pitch' field in `FT_Bitmap'). */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Bitmap_Init */
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/* */
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/* <Description> */
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/* Initialize a pointer to an @FT_Bitmap structure. */
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/* */
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/* <InOut> */
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/* abitmap :: A pointer to the bitmap structure. */
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/* */
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/* <Note> */
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/* A deprecated name for the same function is `FT_Bitmap_New'. */
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/* */
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FT_EXPORT( void )
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FT_Bitmap_Init( FT_Bitmap *abitmap );
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/* deprecated */
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FT_EXPORT( void )
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FT_Bitmap_New( FT_Bitmap *abitmap );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Bitmap_Copy */
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/* */
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/* <Description> */
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/* Copy a bitmap into another one. */
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/* */
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/* <Input> */
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/* library :: A handle to a library object. */
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/* */
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/* source :: A handle to the source bitmap. */
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/* */
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/* <Output> */
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/* target :: A handle to the target bitmap. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Bitmap_Copy( FT_Library library,
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const FT_Bitmap *source,
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FT_Bitmap *target );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Bitmap_Embolden */
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/* */
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/* <Description> */
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/* Embolden a bitmap. The new bitmap will be about `xStrength' */
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/* pixels wider and `yStrength' pixels higher. The left and bottom */
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/* borders are kept unchanged. */
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/* */
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/* <Input> */
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/* library :: A handle to a library object. */
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/* */
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/* xStrength :: How strong the glyph is emboldened horizontally. */
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/* Expressed in 26.6 pixel format. */
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/* */
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/* yStrength :: How strong the glyph is emboldened vertically. */
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/* Expressed in 26.6 pixel format. */
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/* */
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/* <InOut> */
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/* bitmap :: A handle to the target bitmap. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* The current implementation restricts `xStrength' to be less than */
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/* or equal to~8 if bitmap is of pixel_mode @FT_PIXEL_MODE_MONO. */
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/* */
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/* If you want to embolden the bitmap owned by a @FT_GlyphSlotRec, */
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/* you should call @FT_GlyphSlot_Own_Bitmap on the slot first. */
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/* */
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/* Bitmaps in @FT_PIXEL_MODE_GRAY2 and @FT_PIXEL_MODE_GRAY@ format */
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/* are converted to @FT_PIXEL_MODE_GRAY format (i.e., 8bpp). */
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/* */
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FT_EXPORT( FT_Error )
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FT_Bitmap_Embolden( FT_Library library,
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FT_Bitmap* bitmap,
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FT_Pos xStrength,
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FT_Pos yStrength );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Bitmap_Convert */
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/* */
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/* <Description> */
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/* Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, 8bpp or 32bpp */
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/* to a bitmap object with depth 8bpp, making the number of used */
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/* bytes line (a.k.a. the `pitch') a multiple of `alignment'. */
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/* */
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/* <Input> */
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/* library :: A handle to a library object. */
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/* */
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/* source :: The source bitmap. */
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/* */
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/* alignment :: The pitch of the bitmap is a multiple of this */
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/* parameter. Common values are 1, 2, or 4. */
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/* */
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/* <Output> */
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/* target :: The target bitmap. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* It is possible to call @FT_Bitmap_Convert multiple times without */
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/* calling @FT_Bitmap_Done (the memory is simply reallocated). */
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/* */
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/* Use @FT_Bitmap_Done to finally remove the bitmap object. */
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/* */
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/* The `library' argument is taken to have access to FreeType's */
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/* memory handling functions. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Bitmap_Convert( FT_Library library,
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const FT_Bitmap *source,
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FT_Bitmap *target,
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FT_Int alignment );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_GlyphSlot_Own_Bitmap */
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/* */
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/* <Description> */
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/* Make sure that a glyph slot owns `slot->bitmap'. */
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/* */
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/* <Input> */
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/* slot :: The glyph slot. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* This function is to be used in combination with */
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/* @FT_Bitmap_Embolden. */
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/* */
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FT_EXPORT( FT_Error )
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FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot slot );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Bitmap_Done */
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/* */
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/* <Description> */
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/* Destroy a bitmap object initialized with @FT_Bitmap_Init. */
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/* */
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/* <Input> */
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/* library :: A handle to a library object. */
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/* */
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/* bitmap :: The bitmap object to be freed. */
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/* */
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/* <Return> */
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/* FreeType error code. 0~means success. */
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/* */
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/* <Note> */
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/* The `library' argument is taken to have access to FreeType's */
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/* memory handling functions. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Bitmap_Done( FT_Library library,
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FT_Bitmap *bitmap );
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/* */
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FT_END_HEADER
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#endif /* FTBITMAP_H_ */
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/* END */
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