freetype.rar ftoutln.h

*/ /* outline_processing */ /* */ /* */ /* Outline Processing */ /* */ /* <Abstract> */ /* Functions to create, transform, and render vectorial glyph images. */ /* */ /* <Description> */ /* This section contains routines used to create and destroy scalable */ /* glyph images known as `outlines'. These can also be measured, */ /* transformed, and converted into bitmaps and pixmaps. */ /* */ /* <Order> */ /* FT_Outline */ /* FT_Outline_Flags */ /* FT_Outline_New */ /* FT_Outline_Done */ /* FT_Outline_Copy */ /* FT_Outline_Translate */ /* FT_Outline_Transform */ /* FT_Outline_Reverse */ /* FT_Outline_Check */ /* */ /* FT_Outline_Get_CBox */ /* FT_Outline_Get_BBox */ /* */ /* FT_Outline_Get_Bitmap */ /* FT_Outline_Render */ /* */ /* FT_Outline_Decompose */ /* FT_Outline_Funcs */ /* FT_Outline_MoveTo_Func */ /* FT_Outline_LineTo_Func */ /* FT_Outline_ConicTo_Func */ /* FT_Outline_CubicTo_Func */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Decompose */ /* */ /* <Description> */ /* Walks over an outline's structure to decompose it into individual */ /* segments and Bezier arcs. This function is also able to emit */ /* `move to' and `close to' operations to indicate the start and end */ /* of new contours in the outline. */ /* */ /* <Input> */ /* outline :: A pointer to the source target. */ /* */ /* func_interface :: A table of `emitters', i.e,. function pointers */ /* called during decomposition to indicate path */ /* operations. */ /* */ /* <InOut> */ /* user :: A typeless pointer which is passed to each */ /* emitter during the decomposition. It can be */ /* used to store the state during the */ /* decomposition. */ /* */ /* <Return> */ /* FreeType error code. 0 means sucess. */ /* */ FT_EXPORT( FT_Error ) FT_Outline_Decompose( FT_Outline* outline, const FT_Outline_Funcs* func_interface, void* user ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_New */ /* */ /* <Description> */ /* Creates a new outline of a given size. */ /* */ /* <Input> */ /* library :: A handle to the library object from where the */ /* outline is allocated. Note however that the new */ /* outline will NOT necessarily be FREED, when */ /* destroying the library, by FT_Done_FreeType(). */ /* */ /* numPoints :: The maximal number of points within the outline. */ /* */ /* numContours :: The maximal number of contours within the outline. */ /* */ /* <Output> */ /* anoutline :: A handle to the new outline. NULL in case of */ /* error. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The reason why this function takes a `library' parameter is simply */ /* to use the library's memory allocator. */ /* */ FT_EXPORT( FT_Error ) FT_Outline_New( FT_Library library, FT_UInt numPoints, FT_Int numContours, FT_Outline *anoutline ); FT_EXPORT( FT_Error ) FT_Outline_New_Internal( FT_Memory memory, FT_UInt numPoints, FT_Int numContours, FT_Outline *anoutline ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Done */ /* */ /* <Description> */ /* Destroys an outline created with FT_Outline_New(). */ /* */ /* <Input> */ /* library :: A handle of the library object used to allocate the */ /* outline. */ /* */ /* outline :: A pointer to the outline object to be discarded. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* If the outline's `owner' field is not set, only the outline */ /* descriptor will be released. */ /* */ /* The reason why this function takes an `library' parameter is */ /* simply to use FT_Free(). */ /* */ FT_EXPORT( FT_Error ) FT_Outline_Done( FT_Library library, FT_Outline* outline ); FT_EXPORT( FT_Error ) FT_Outline_Done_Internal( FT_Memory memory, FT_Outline* outline ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Check */ /* */ /* <Description> */ /* Check the contents of an outline descriptor. */ /* */ /* <Input> */ /* outline :: A handle to a source outline. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FT_Outline_Check( FT_Outline* outline ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Get_CBox */ /* */ /* <Description> */ /* Returns an outline's `control box'. The control box encloses all */ /* the outline's points, including Bezier control points. Though it */ /* coincides with the exact bounding box for most glyphs, it can be */ /* slightly larger in some situations (like when rotating an outline */ /* which contains Bezier outside arcs). */ /* */ /* Computing the control box is very fast, while getting the bounding */ /* box can take much more time as it needs to walk over all segments */ /* and arcs in the outline. To get the latter, you can use the */ /* `ftbbox' component which is dedicated to this single task. */ /* */ /* <Input> */ /* outline :: A pointer to the source outline descriptor. */ /* */ /* <Output> */ /* acbox :: The outline's control box. */ /* */ FT_EXPORT( void ) FT_Outline_Get_CBox( FT_Outline* outline, FT_BBox *acbox ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Translate */ /* */ /* <Description> */ /* Applies a simple translation to the points of an outline. */ /* */ /* <InOut> */ /* outline :: A pointer to the target outline descriptor. */ /* */ /* <Input> */ /* xOffset :: The horizontal offset. */ /* */ /* yOffset :: The vertical offset. */ /* */ FT_EXPORT( void ) FT_Outline_Translate( FT_Outline* outline, FT_Pos xOffset, FT_Pos yOffset ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Copy */ /* */ /* <Description> */ /* Copies an outline into another one. Both objects must have the */ /* same sizes (number of points & number of contours) when this */ /* function is called. */ /* */ /* <Input> */ /* source :: A handle to the source outline. */ /* */ /* <Output> */ /* target :: A handle to the target outline. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FT_Outline_Copy( FT_Outline* source, FT_Outline *target ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Transform */ /* */ /* <Description> */ /* Applies a simple 2x2 matrix to all of an outline's points. Useful */ /* for applying rotations, slanting, flipping, etc. */ /* */ /* <InOut> */ /* outline :: A pointer to the target outline descriptor. */ /* */ /* <Input> */ /* matrix :: A pointer to the transformation matrix. */ /* */ /* <Note> */ /* You can use FT_Outline_Translate() if you need to translate the */ /* outline's points. */ /* */ FT_EXPORT( void ) FT_Outline_Transform( FT_Outline* outline, FT_Matrix* matrix ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Reverse */ /* */ /* <Description> */ /* Reverses the drawing direction of an outline. This is used to */ /* ensure consistent fill conventions for mirrored glyphs. */ /* */ /* <InOut> */ /* outline :: A pointer to the target outline descriptor. */ /* */ /* <Note> */ /* This functions toggles the bit flag `FT_OUTLINE_REVERSE_FILL' in */ /* the outline's `flags' field. */ /* */ /* It shouldn't be used by a normal client application, unless it */ /* knows what it is doing. */ /* */ FT_EXPORT( void ) FT_Outline_Reverse( FT_Outline* outline ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Get_Bitmap */ /* */ /* <Description> */ /* Renders an outline within a bitmap. The outline's image is simply */ /* OR-ed to the target bitmap. */ /* */ /* <Input> */ /* library :: A handle to a FreeType library object. */ /* */ /* outline :: A pointer to the source outline descriptor. */ /* */ /* <Output> */ /* abitmap :: A pointer to the target bitmap descriptor. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* This function does NOT CREATE the bitmap, it only renders an */ /* outline image within the one you pass to it! */ /* */ /* It will use the raster correponding to the default glyph format. */ /* */ FT_EXPORT( FT_Error ) FT_Outline_Get_Bitmap( FT_Library library, FT_Outline* outline, FT_Bitmap *abitmap ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Outline_Render */ /* */ /* <Description> */ /* Renders an outline within a bitmap using the current scan-convert. */ /* This functions uses an FT_Raster_Params structure as an argument, */ /* allowing advanced features like direct composition, translucency, */ /* etc. */ /* */ /* <Input> */ /* library :: A handle to a FreeType library object. */ /* */ /* outline :: A pointer to the source outline descriptor. */ /* */ /* <InOut> */ /* params :: A pointer to a FT_Raster_Params structure used to */ /* describe the rendering operation. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* You should know what you are doing and how FT_Raster_Params works */ /* to use this function. */ /* */ /* The field `params.source' will be set to `outline' before the scan */ /* converter is called, which means that the value you give to it is */ /* actually ignored. */ /* */ FT_EXPORT( FT_Error ) FT_Outline_Render( FT_Library library, FT_Outline* outline, FT_Raster_Params* params ); /* */ FT_END_HEADER #endif /* __FTOUTLN_H__ */ /* END */ </pre> <script src="/inc/gg_read2.js"></script><BR> <script src="http://s117.cnzz.com/stat.php?id=1236358&web_id=1236358&show=pic" language="JavaScript" charset="gb2312"></script> </body></html>