* src/base/ftstroke.c, include/freetype/ftstroke.h: fixing bugs and
adding FT_Glyph_Stroke and FT_Glyph_StrokerBorder APIs
This commit is contained in:
David Turner
parent
cd9f3b3b5a
commit
fa0346d6d9
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@ -21,6 +21,7 @@
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#include <ft2build.h>
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#include FT_OUTLINE_H
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#include FT_GLYPH_H
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FT_BEGIN_HEADER
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@ -128,7 +129,7 @@ FT_BEGIN_HEADER
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{
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FT_STROKER_BORDER_LEFT = 0,
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FT_STROKER_BORDER_RIGHT
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} FT_StrokerBorder;
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@ -173,7 +174,7 @@ FT_BEGIN_HEADER
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FT_EXPORT( FT_StrokerBorder )
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FT_Outline_GetOutsideBorder( FT_Outline* outline );
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/**************************************************************
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*
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* @function:
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@ -234,6 +235,24 @@ FT_BEGIN_HEADER
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FT_Fixed miter_limit );
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/**************************************************************
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*
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* @function:
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* FT_Stroker_Rewind
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*
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* @description:
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* Reset a stroker object without changing its attributes.
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* you should call this function before beginning a new
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* series of calls to @FT_Stroker_BeginSubPath/@FT_Stroker_EndSubPath
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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*/
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FT_EXPORT( void )
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FT_Stroker_Rewind( FT_Stroker stroker );
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/**************************************************************
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*
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* @function:
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@ -264,6 +283,8 @@ FT_BEGIN_HEADER
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*
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* If `opened' is 1, the outline is processed as an open path, and the
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* stroker will generate a single `stroke' outline.
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*
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* this function calls @FT_Stroker_Rewind automatically
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*/
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FT_EXPORT( FT_Error )
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FT_Stroker_ParseOutline( FT_Stroker stroker,
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@ -278,7 +299,7 @@ FT_BEGIN_HEADER
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*
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* @description:
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* Start a new sub-path in the stroker.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -309,7 +330,7 @@ FT_BEGIN_HEADER
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*
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* @description:
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* Close the current sub-path in the stroker.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -334,7 +355,7 @@ FT_BEGIN_HEADER
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* @description:
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* `Draw' a single line segment in the stroker's current sub-path,
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* from the last position.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -362,7 +383,7 @@ FT_BEGIN_HEADER
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* @description:
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* `Draw; a single quadratic bezier in the stroker's current sub-path,
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* from the last position.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -394,7 +415,7 @@ FT_BEGIN_HEADER
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* @description:
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* `Draw' a single cubic Bézier in the stroker's current sub-path,
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* from the last position.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -432,7 +453,7 @@ FT_BEGIN_HEADER
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* with the stroker. It will return the number of points and
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* contours necessary to export one of the `border' or `stroke'
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* outlines generated by the stroker.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -453,7 +474,7 @@ FT_BEGIN_HEADER
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* @note:
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* When an outline, or a sub-path, is `closed', the stroker generates
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* two independent `border' outlines, named `left' and `right'.
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*
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*
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* When the outline, or a sub-path, is `opened', the stroker merges
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* the `border' outlines with caps. The `left' border receives all
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* points, while the `right' border becomes empty.
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@ -477,7 +498,7 @@ FT_BEGIN_HEADER
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* Call this function after @FT_Stroker_GetBorderCounts to
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* export the corresponding border to your own @FT_Outline
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* structure.
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*
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*
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* Note that this function will append the border points and
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* contours to your outline, but will not try to resize its
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* arrays.
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@ -499,7 +520,7 @@ FT_BEGIN_HEADER
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*
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* When an outline, or a sub-path, is `closed', the stroker generates
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* two independent `border' outlines, named `left' and `right'
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*
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*
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* When the outline, or a sub-path, is `opened', the stroker merges
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* the `border' outlines with caps. The `left' border receives all
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* points, while the `right' border becomes empty.
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@ -523,7 +544,7 @@ FT_BEGIN_HEADER
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* with the stroker. It returns the number of points and
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* contours necessary to export all points/borders from the stroked
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* outline/path.
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*
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*
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* @input:
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* stroker ::
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* The target stroker handle.
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@ -552,7 +573,7 @@ FT_BEGIN_HEADER
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* @description:
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* Call this function after @FT_Stroker_GetBorderCounts to
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* export the all borders to your own @FT_Outline structure.
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*
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*
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* Note that this function will append the border points and
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* contours to your outline, but will not try to resize its
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* arrays.
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@ -584,6 +605,73 @@ FT_BEGIN_HEADER
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FT_EXPORT( void )
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FT_Stroker_Done( FT_Stroker stroker );
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/**************************************************************
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*
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* @function:
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* FT_Glyph_Stroke
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*
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* @description:
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* stroke a given outline glyph object with a given stroker
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*
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* @inout:
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* pglyph :: source glyph handle on input, new glyph handle
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* on output.
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*
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* @input:
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* stroker ::
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* A stroker handle.
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*
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* destroy :: boolean. If TRUE, the source glyph object is destroyed
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* on success
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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 source glyph is untouched in case of error.
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*/
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FT_EXPORT( FT_Error )
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FT_Glyph_Stroke( FT_Glyph *pglyph,
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FT_Stroker stroker,
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FT_Bool destroy );
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/**************************************************************
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*
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* @function:
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* FT_Glyph_StrokeBorder
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*
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* @description:
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* stroke a given outline glyph object with a given stroker, but
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* only returns either its inside or outside border
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*
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* @inout:
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* pglyph :: source glyph handle on input, new glyph handle
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* on output.
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*
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* @input:
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* stroker ::
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* A stroker handle.
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*
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* inside :: boolean. If TRUE, return the inside border; otherwise,
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* the outside border
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*
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* destroy :: boolean. If TRUE, the source glyph object is destroyed
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* on success
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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 source glyph is untouched in case of error.
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*/
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FT_EXPORT( FT_Error )
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FT_Glyph_StrokeBorder( FT_Glyph *pglyph,
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FT_Stroker stroker,
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FT_Bool inside,
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FT_Bool destroy );
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/* */
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FT_END_HEADER
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@ -22,7 +22,7 @@
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#include FT_OUTLINE_H
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#include FT_INTERNAL_MEMORY_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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FT_EXPORT_DEF( FT_StrokerBorder )
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FT_Outline_GetInsideBorder( FT_Outline* outline )
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@ -41,8 +41,8 @@
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FT_Orientation o = FT_Outline_Get_Orientation( outline );
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return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_RIGHT
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: FT_STROKER_BORDER_LEFT ;
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return o == FT_ORIENTATION_TRUETYPE ? FT_STROKER_BORDER_LEFT
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: FT_STROKER_BORDER_RIGHT ;
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}
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@ -581,7 +581,8 @@
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{
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/* copy point locations */
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FT_ARRAY_COPY( outline->points + outline->n_points,
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border->points, border->num_points );
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border->points,
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border->num_points );
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/* copy tags */
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{
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@ -689,8 +690,18 @@
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stroker->line_join = line_join;
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stroker->miter_limit = miter_limit;
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ft_stroke_border_reset( &stroker->borders[0] );
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ft_stroke_border_reset( &stroker->borders[1] );
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FT_Stroker_Rewind( stroker );
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}
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FT_EXPORT_DEF( void )
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FT_Stroker_Rewind( FT_Stroker stroker )
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{
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if ( stroker )
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{
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ft_stroke_border_reset( &stroker->borders[0] );
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ft_stroke_border_reset( &stroker->borders[1] );
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}
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}
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@ -1373,7 +1384,6 @@
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{
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FT_Error error = 0;
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if ( stroker->subpath_open )
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{
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FT_StrokeBorder right = stroker->borders;
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@ -1406,6 +1416,15 @@
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FT_Angle turn;
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FT_Int inside_side;
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/* close the path if needed
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*/
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if ( stroker->center.x != stroker->subpath_start.x ||
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stroker->center.y != stroker->subpath_start.y )
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{
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error = FT_Stroker_LineTo( stroker, &stroker->subpath_start );
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if ( error )
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goto Exit;
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}
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/* process the corner */
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stroker->angle_out = stroker->subpath_angle;
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@ -1434,14 +1453,9 @@
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goto Exit;
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}
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/* we will first end our two subpaths */
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/* then end our two subpaths */
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ft_stroke_border_close( stroker->borders + 0 );
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ft_stroke_border_close( stroker->borders + 1 );
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/* now, add the reversed left subpath to "right" */
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error = ft_stroker_add_reverse_left( stroker, 0 );
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if ( error )
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goto Exit;
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}
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Exit:
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@ -1561,6 +1575,8 @@
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if ( !outline || !stroker )
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return FT_Err_Invalid_Argument;
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FT_Stroker_Rewind( stroker );
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first = 0;
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for ( n = 0; n < outline->n_contours; n++ )
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@ -1731,4 +1747,150 @@
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}
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extern const FT_Glyph_Class ft_outline_glyph_class;
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FT_EXPORT_DEF( FT_Error )
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FT_Glyph_Stroke( FT_Glyph *pglyph,
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FT_Stroker stroker,
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FT_Bool destroy )
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{
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FT_Error error = FT_Err_Invalid_Argument;
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FT_Glyph glyph = NULL;
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if ( pglyph == NULL )
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goto Exit;
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glyph = *pglyph;
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if ( glyph == NULL || glyph->clazz != &ft_outline_glyph_class )
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goto Exit;
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{
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FT_Glyph copy;
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error = FT_Glyph_Copy( glyph, © );
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if ( error )
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goto Exit;
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glyph = copy;
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}
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{
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FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph;
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FT_Outline* outline = &oglyph->outline;
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FT_UInt num_points, num_contours;
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error = FT_Stroker_ParseOutline( stroker, outline, 0 );
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if (error)
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goto Fail;
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(void)FT_Stroker_GetCounts( stroker, &num_points, &num_contours );
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FT_Outline_Done( glyph->library, outline );
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error = FT_Outline_New( glyph->library, num_points, num_contours, outline );
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if ( error )
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goto Fail;
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outline->n_points = 0;
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outline->n_contours = 0;
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FT_Stroker_Export( stroker, outline );
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}
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if ( destroy )
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FT_Done_Glyph( *pglyph );
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*pglyph = glyph;
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goto Exit;
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Fail:
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FT_Done_Glyph( glyph );
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glyph = NULL;
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if ( !destroy )
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*pglyph = NULL;
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Exit:
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return error;
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}
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FT_EXPORT_DEF( FT_Error )
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FT_Glyph_StrokeBorder( FT_Glyph *pglyph,
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FT_Stroker stroker,
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FT_Bool inside,
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FT_Bool destroy )
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{
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FT_Error error = FT_Err_Invalid_Argument;
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FT_Glyph glyph = NULL;
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if ( pglyph == NULL )
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goto Exit;
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glyph = *pglyph;
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if ( glyph == NULL || glyph->clazz != &ft_outline_glyph_class )
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goto Exit;
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{
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FT_Glyph copy;
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error = FT_Glyph_Copy( glyph, © );
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if ( error )
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goto Exit;
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glyph = copy;
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}
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{
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FT_OutlineGlyph oglyph = (FT_OutlineGlyph) glyph;
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FT_StrokerBorder border;
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FT_Outline* outline = &oglyph->outline;
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FT_UInt num_points, num_contours;
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border = FT_Outline_GetOutsideBorder( outline );
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if ( inside )
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border = 1-border;
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error = FT_Stroker_ParseOutline( stroker, outline, 0 );
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if (error)
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goto Fail;
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(void)FT_Stroker_GetBorderCounts( stroker, border,
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&num_points, &num_contours );
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FT_Outline_Done( glyph->library, outline );
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error = FT_Outline_New( glyph->library,
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num_points,
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num_contours,
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outline );
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if ( error )
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goto Fail;
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outline->n_points = 0;
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outline->n_contours = 0;
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FT_Stroker_ExportBorder( stroker, border, outline );
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}
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if ( destroy )
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FT_Done_Glyph( *pglyph );
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*pglyph = glyph;
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goto Exit;
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Fail:
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FT_Done_Glyph( glyph );
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glyph = NULL;
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if ( !destroy )
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*pglyph = NULL;
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Exit:
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return error;
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}
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/* END */
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