234 lines
11 KiB
C
234 lines
11 KiB
C
/***************************************************************************/
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/* */
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/* ftrender.h */
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/* */
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/* FreeType renderer modules public interface (specification). */
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/* */
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/* Copyright 1996-2017 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 FTRENDER_H_
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#define FTRENDER_H_
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#include <ft2build.h>
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#include FT_MODULE_H
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#include FT_GLYPH_H
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <Section> */
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/* module_management */
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/* */
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/*************************************************************************/
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/* create a new glyph object */
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typedef FT_Error
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(*FT_Glyph_InitFunc)( FT_Glyph glyph,
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FT_GlyphSlot slot );
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/* destroys a given glyph object */
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typedef void
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(*FT_Glyph_DoneFunc)( FT_Glyph glyph );
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typedef void
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(*FT_Glyph_TransformFunc)( FT_Glyph glyph,
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const FT_Matrix* matrix,
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const FT_Vector* delta );
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typedef void
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(*FT_Glyph_GetBBoxFunc)( FT_Glyph glyph,
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FT_BBox* abbox );
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typedef FT_Error
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(*FT_Glyph_CopyFunc)( FT_Glyph source,
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FT_Glyph target );
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typedef FT_Error
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(*FT_Glyph_PrepareFunc)( FT_Glyph glyph,
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FT_GlyphSlot slot );
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/* deprecated */
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#define FT_Glyph_Init_Func FT_Glyph_InitFunc
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#define FT_Glyph_Done_Func FT_Glyph_DoneFunc
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#define FT_Glyph_Transform_Func FT_Glyph_TransformFunc
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#define FT_Glyph_BBox_Func FT_Glyph_GetBBoxFunc
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#define FT_Glyph_Copy_Func FT_Glyph_CopyFunc
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#define FT_Glyph_Prepare_Func FT_Glyph_PrepareFunc
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struct FT_Glyph_Class_
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{
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FT_Long glyph_size;
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FT_Glyph_Format glyph_format;
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FT_Glyph_InitFunc glyph_init;
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FT_Glyph_DoneFunc glyph_done;
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FT_Glyph_CopyFunc glyph_copy;
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FT_Glyph_TransformFunc glyph_transform;
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FT_Glyph_GetBBoxFunc glyph_bbox;
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FT_Glyph_PrepareFunc glyph_prepare;
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};
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typedef FT_Error
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(*FT_Renderer_RenderFunc)( FT_Renderer renderer,
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FT_GlyphSlot slot,
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FT_Render_Mode mode,
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const FT_Vector* origin );
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typedef FT_Error
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(*FT_Renderer_TransformFunc)( FT_Renderer renderer,
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FT_GlyphSlot slot,
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const FT_Matrix* matrix,
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const FT_Vector* delta );
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typedef void
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(*FT_Renderer_GetCBoxFunc)( FT_Renderer renderer,
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FT_GlyphSlot slot,
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FT_BBox* cbox );
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typedef FT_Error
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(*FT_Renderer_SetModeFunc)( FT_Renderer renderer,
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FT_ULong mode_tag,
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FT_Pointer mode_ptr );
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/* deprecated identifiers */
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#define FTRenderer_render FT_Renderer_RenderFunc
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#define FTRenderer_transform FT_Renderer_TransformFunc
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#define FTRenderer_getCBox FT_Renderer_GetCBoxFunc
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#define FTRenderer_setMode FT_Renderer_SetModeFunc
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_Renderer_Class */
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/* */
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/* <Description> */
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/* The renderer module class descriptor. */
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/* */
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/* <Fields> */
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/* root :: The root @FT_Module_Class fields. */
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/* */
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/* glyph_format :: The glyph image format this renderer handles. */
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/* */
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/* render_glyph :: A method used to render the image that is in a */
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/* given glyph slot into a bitmap. */
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/* */
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/* transform_glyph :: A method used to transform the image that is in */
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/* a given glyph slot. */
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/* */
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/* get_glyph_cbox :: A method used to access the glyph's cbox. */
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/* */
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/* set_mode :: A method used to pass additional parameters. */
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/* */
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/* raster_class :: For @FT_GLYPH_FORMAT_OUTLINE renderers only. */
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/* This is a pointer to its raster's class. */
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/* */
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typedef struct FT_Renderer_Class_
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{
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FT_Module_Class root;
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FT_Glyph_Format glyph_format;
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FT_Renderer_RenderFunc render_glyph;
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FT_Renderer_TransformFunc transform_glyph;
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FT_Renderer_GetCBoxFunc get_glyph_cbox;
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FT_Renderer_SetModeFunc set_mode;
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FT_Raster_Funcs* raster_class;
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} FT_Renderer_Class;
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Get_Renderer */
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/* */
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/* <Description> */
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/* Retrieve the current renderer for a given glyph format. */
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/* */
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/* <Input> */
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/* library :: A handle to the library object. */
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/* */
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/* format :: The glyph format. */
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/* */
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/* <Return> */
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/* A renderer handle. 0~if none found. */
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/* */
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/* <Note> */
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/* An error will be returned if a module already exists by that name, */
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/* or if the module requires a version of FreeType that is too great. */
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/* */
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/* To add a new renderer, simply use @FT_Add_Module. To retrieve a */
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/* renderer by its name, use @FT_Get_Module. */
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/* */
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FT_EXPORT( FT_Renderer )
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FT_Get_Renderer( FT_Library library,
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FT_Glyph_Format format );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Set_Renderer */
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/* */
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/* <Description> */
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/* Set the current renderer to use, and set additional mode. */
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/* */
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/* <InOut> */
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/* library :: A handle to the library object. */
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/* */
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/* <Input> */
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/* renderer :: A handle to the renderer object. */
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/* */
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/* num_params :: The number of additional parameters. */
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/* */
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/* parameters :: Additional parameters. */
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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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/* In case of success, the renderer will be used to convert glyph */
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/* images in the renderer's known format into bitmaps. */
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/* */
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/* This doesn't change the current renderer for other formats. */
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/* */
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/* Currently, no FreeType renderer module uses `parameters'; you */
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/* should thus always pass NULL as the value. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Set_Renderer( FT_Library library,
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FT_Renderer renderer,
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FT_UInt num_params,
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FT_Parameter* parameters );
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/* */
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FT_END_HEADER
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#endif /* FTRENDER_H_ */
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/* END */
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