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/***************************************************************************/
/* */
/* ftrender.h */
/* */
/* FreeType renderer modules public interface (specification). */
/* */
/* Copyright 1996-2018 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#ifndef FTRENDER_H_
#define FTRENDER_H_
#include <ft2build.h>
#include FT_MODULE_H
#include FT_GLYPH_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* module_management */
/* */
/*************************************************************************/
/* create a new glyph object */
typedef FT_Error
(*FT_Glyph_InitFunc)( FT_Glyph glyph,
FT_GlyphSlot slot );
/* destroys a given glyph object */
typedef void
(*FT_Glyph_DoneFunc)( FT_Glyph glyph );
typedef void
(*FT_Glyph_TransformFunc)( FT_Glyph glyph,
const FT_Matrix* matrix,
const FT_Vector* delta );
typedef void
(*FT_Glyph_GetBBoxFunc)( FT_Glyph glyph,
FT_BBox* abbox );
typedef FT_Error
(*FT_Glyph_CopyFunc)( FT_Glyph source,
FT_Glyph target );
typedef FT_Error
(*FT_Glyph_PrepareFunc)( FT_Glyph glyph,
FT_GlyphSlot slot );
/* deprecated */
#define FT_Glyph_Init_Func FT_Glyph_InitFunc
#define FT_Glyph_Done_Func FT_Glyph_DoneFunc
#define FT_Glyph_Transform_Func FT_Glyph_TransformFunc
#define FT_Glyph_BBox_Func FT_Glyph_GetBBoxFunc
#define FT_Glyph_Copy_Func FT_Glyph_CopyFunc
#define FT_Glyph_Prepare_Func FT_Glyph_PrepareFunc
struct FT_Glyph_Class_
{
FT_Long glyph_size;
FT_Glyph_Format glyph_format;
FT_Glyph_InitFunc glyph_init;
FT_Glyph_DoneFunc glyph_done;
FT_Glyph_CopyFunc glyph_copy;
FT_Glyph_TransformFunc glyph_transform;
FT_Glyph_GetBBoxFunc glyph_bbox;
FT_Glyph_PrepareFunc glyph_prepare;
};
typedef FT_Error
(*FT_Renderer_RenderFunc)( FT_Renderer renderer,
FT_GlyphSlot slot,
FT_Render_Mode mode,
const FT_Vector* origin );
typedef FT_Error
(*FT_Renderer_TransformFunc)( FT_Renderer renderer,
FT_GlyphSlot slot,
const FT_Matrix* matrix,
const FT_Vector* delta );
typedef void
(*FT_Renderer_GetCBoxFunc)( FT_Renderer renderer,
FT_GlyphSlot slot,
FT_BBox* cbox );
typedef FT_Error
(*FT_Renderer_SetModeFunc)( FT_Renderer renderer,
FT_ULong mode_tag,
FT_Pointer mode_ptr );
/* deprecated identifiers */
#define FTRenderer_render FT_Renderer_RenderFunc
#define FTRenderer_transform FT_Renderer_TransformFunc
#define FTRenderer_getCBox FT_Renderer_GetCBoxFunc
#define FTRenderer_setMode FT_Renderer_SetModeFunc
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Renderer_Class */
/* */
/* <Description> */
/* The renderer module class descriptor. */
/* */
/* <Fields> */
/* root :: The root @FT_Module_Class fields. */
/* */
/* glyph_format :: The glyph image format this renderer handles. */
/* */
/* render_glyph :: A method used to render the image that is in a */
/* given glyph slot into a bitmap. */
/* */
/* transform_glyph :: A method used to transform the image that is in */
/* a given glyph slot. */
/* */
/* get_glyph_cbox :: A method used to access the glyph's cbox. */
/* */
/* set_mode :: A method used to pass additional parameters. */
/* */
/* raster_class :: For @FT_GLYPH_FORMAT_OUTLINE renderers only. */
/* This is a pointer to its raster's class. */
/* */
typedef struct FT_Renderer_Class_
{
FT_Module_Class root;
FT_Glyph_Format glyph_format;
FT_Renderer_RenderFunc render_glyph;
FT_Renderer_TransformFunc transform_glyph;
FT_Renderer_GetCBoxFunc get_glyph_cbox;
FT_Renderer_SetModeFunc set_mode;
FT_Raster_Funcs* raster_class;
} FT_Renderer_Class;
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Renderer */
/* */
/* <Description> */
/* Retrieve the current renderer for a given glyph format. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* format :: The glyph format. */
/* */
/* <Return> */
/* A renderer handle. 0~if none found. */
/* */
/* <Note> */
/* An error will be returned if a module already exists by that name, */
/* or if the module requires a version of FreeType that is too great. */
/* */
/* To add a new renderer, simply use @FT_Add_Module. To retrieve a */
/* renderer by its name, use @FT_Get_Module. */
/* */
FT_EXPORT( FT_Renderer )
FT_Get_Renderer( FT_Library library,
FT_Glyph_Format format );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Renderer */
/* */
/* <Description> */
/* Set the current renderer to use, and set additional mode. */
/* */
/* <InOut> */
/* library :: A handle to the library object. */
/* */
/* <Input> */
/* renderer :: A handle to the renderer object. */
/* */
/* num_params :: The number of additional parameters. */
/* */
/* parameters :: Additional parameters. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* In case of success, the renderer will be used to convert glyph */
/* images in the renderer's known format into bitmaps. */
/* */
/* This doesn't change the current renderer for other formats. */
/* */
/* Currently, no FreeType renderer module uses `parameters'; you */
/* should thus always pass NULL as the value. */
/* */
FT_EXPORT( FT_Error )
FT_Set_Renderer( FT_Library library,
FT_Renderer renderer,
FT_UInt num_params,
FT_Parameter* parameters );
/* */
FT_END_HEADER
#endif /* FTRENDER_H_ */
/* END */