David Turner
23 years ago
parent
318f3befc6
commit
b7e18efcd2
4 changed files with 472 additions and 0 deletions
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#ifndef __FT_STROKER_H__ |
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#define __FT_STROKER_H__ |
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#include <ft2build.h> |
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#include FT_OUTLINE_H |
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FT_BEGIN_HEADER |
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/**************************************************************
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* |
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* @type: FT_Stroker |
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* |
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* @description: |
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* opaque handler to a path stroker object |
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*/ |
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typedef struct FT_StrokerRec_* FT_Stroker; |
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/**************************************************************
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* |
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* @enum: FT_Stroker_LineJoin |
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* |
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* @description: |
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* these values determine how two joining lines are rendered |
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* in a stroker. |
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* |
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* @values: |
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* FT_STROKER_LINEJOIN_ROUND :: |
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* used to render rounded line joins. circular arcs are used |
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* to join two lines smoothly |
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* |
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* FT_STROKER_LINEJOIN_BEVEL :: |
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* used to render beveled line joins; i.e. the two joining lines |
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* are extended until they intersect |
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* |
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* FT_STROKER_LINEJOIN_MITER :: |
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* same as beveled rendering, except that an additional line |
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* break is added if the angle between the two joining lines |
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* is too closed (this is useful to avoid unpleasant spikes |
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* in beveled rendering). |
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*/ |
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typedef enum |
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{ |
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FT_STROKER_LINEJOIN_ROUND = 0, |
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FT_STROKER_LINEJOIN_BEVEL, |
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FT_STROKER_LINEJOIN_MITER |
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} FT_Stroker_LineJoin; |
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/**************************************************************
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* |
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* @enum: FT_Stroker_LineCap |
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* |
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* @description: |
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* these values determine how the end of opened sub-paths are |
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* rendered in a stroke |
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* |
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* @values: |
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* FT_STROKER_LINECAP_BUTT :: |
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* the end of lines is rendered as a full stop on the last |
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* point itself |
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* |
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* FT_STROKER_LINECAP_ROUND :: |
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* the end of lines is rendered as a half-circle around the |
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* last point |
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* |
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* FT_STROKER_LINEJOIN_MITER :: |
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* the end of lines is rendered as a square around the |
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* last point |
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*/ |
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typedef enum |
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{ |
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FT_STROKER_LINECAP_BUTT = 0, |
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FT_STROKER_LINECAP_ROUND, |
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FT_STROKER_LINECAP_SQUARE |
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} FT_Stroker_LineCap; |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_New( FT_Memory memory, |
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FT_Stroker *astroker ); |
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FT_EXPORT( void ) |
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FT_Stroker_Set( FT_Stroker stroker, |
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FT_Fixed radius, |
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FT_Stroker_LineCap line_cap, |
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FT_Stroker_LineJoin line_join, |
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FT_Fixed miter_limit ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_BeginSubPath( FT_Stroker stroker, |
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FT_Pos x, |
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FT_Pos y, |
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FT_Bool open ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_EndSubPath( FT_Stroker stroker ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_LineTo( FT_Stroker stroker, |
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FT_Pos to_x, |
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FT_Pos to_y ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_ConicTo( FT_Stroker stroker, |
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FT_Pos control_x, |
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FT_Pos control_y, |
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FT_Pos to_x, |
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FT_Pos to_y ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_CubicTo( FT_Stroker stroker, |
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FT_Pos control1_x, |
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FT_Pos control1_y, |
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FT_Pos control2_x, |
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FT_Pos control2_y, |
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FT_Pos to_x, |
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FT_Pos to_y ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_GetCounts( FT_Stroker stroker, |
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FT_UInt *anum_points, |
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FT_UInt *anum_contours ); |
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FT_EXPORT( void ) |
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FT_Stroker_Export( FT_Stroker stroker, |
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FT_Outliner* outline ); |
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FT_EXPORT( void ) |
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FT_Stroker_Done( FT_Stroker stroker ); |
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FT_EXPORT( FT_Error ) |
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FT_Stroker_ParseOutline( FT_Stroker stroker, |
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FT_Outline* outline, |
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FT_Bool opened ); |
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FT_END_HEADER |
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#endif /* __FT_STROKER_H__ */ |
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@ -0,0 +1,290 @@ |
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#include <ft2build.h> |
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#include FT_STROKER_H |
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#include FT_TRIGONOMETRY_H |
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/***************************************************************************/ |
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/***************************************************************************/ |
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/***** *****/ |
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/***** STROKE BORDERS *****/ |
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/***** *****/ |
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/***************************************************************************/ |
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/***************************************************************************/ |
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typedef enum |
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{ |
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FT_STROKE_TAG_ON = 1, /* on-curve point */ |
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FT_STROKE_TAG_CUBIC = 2, /* cubic off-point */ |
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FT_STROKE_TAG_BEGIN = 4, /* sub-path start */ |
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FT_STROKE_TAG_END = 8 /* sub-path end */ |
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} FT_StrokeTags; |
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typedef struct FT_StrokeBorderRec_ |
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{ |
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FT_UInt num_points; |
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FT_UInt max_points; |
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FT_Vector* points; |
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FT_Byte* tags; |
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FT_Bool movable; |
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FT_Int start; /* index of current sub-path start point */ |
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FT_Memory memory; |
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} FT_StrokeBorderRec, *FT_StrokeBorder; |
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static FT_Error |
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ft_stroke_border_grow( FT_StrokeBorder border, |
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FT_UInt new_points ) |
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{ |
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FT_UInt old_max = border->max_points; |
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FT_UInt new_max = border->num_points + new_points; |
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FT_Error error = 0; |
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if ( new_max > old_max ) |
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{ |
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FT_UInt cur_max = old_max; |
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FT_Memory memory =
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while ( cur_max < new_max ) |
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cur_max += (cur_max >> 1) + 16; |
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if ( FT_RENEW_ARRAY( border->points, old_max, cur_max ) || |
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FT_RENEW_ARRAY( border->tags, old_max, cur_max ) ) |
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goto Exit; |
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border->max_points = cur_max; |
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} |
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Exit: |
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return error; |
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} |
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static void |
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ft_stroke_border_close( FT_StrokeBorder border ) |
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{ |
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FT_ASSERT( border->start >= 0 ); |
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border->tags[ border->start ] |= FT_STROKE_TAG_BEGIN; |
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border->tags[ border->num_points-1 ] |= FT_STROKE_TAG_END; |
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border->start = -1; |
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} |
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static FT_Error |
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ft_stroke_border_lineto( FT_StrokeBorder border, |
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FT_Vector* to ) |
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{ |
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FT_Error error; |
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FT_ASSERT( border->start >= 0 ); |
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error = ft_stroker_border_grow( border, 1 ); |
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if (!error) |
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{ |
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FT_Vector* vec = border->points + border->num_points; |
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FT_Byte* tag = border->tags + border->num_points; |
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vec[0] = *to; |
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tag[0] = FT_STROKE_TAG_ON; |
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border->num_points += 1; |
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} |
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return error; |
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}
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static FT_Error |
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ft_stroke_border_conicto( FT_StrokeBorder border, |
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FT_Vector* control, |
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FT_Vector* to ) |
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{ |
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FT_Error error; |
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FT_ASSERT( border->start >= 0 ); |
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error = ft_stroker_border_grow( border, 2 ); |
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if (!error) |
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{ |
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FT_Vector* vec = border->points + border->num_points; |
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FT_Byte* tag = border->tags + border->num_points; |
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vec[0] = *control; |
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vec[1] = *to; |
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tag[0] = 0; |
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tag[1] = FT_STROKE_TAG_ON; |
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border->num_points += 2; |
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} |
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return error; |
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}
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static FT_Error |
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ft_stroke_border_cubicto( FT_StrokeBorder border, |
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FT_Vector* control1, |
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FT_Vector* control2, |
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FT_Vector* to ) |
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{ |
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FT_Error error; |
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FT_ASSERT( border->start >= 0 ); |
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error = ft_stroker_border_grow( border, 3 ); |
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if (!error) |
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{ |
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FT_Vector* vec = border->points + border->num_points; |
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FT_Byte* tag = border->tags + border->num_points; |
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vec[0] = *control1; |
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vec[1] = *control2; |
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vec[2] = *to; |
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tag[0] = FT_STROKE_TAG_CUBIC; |
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tag[1] = FT_STROKE_TAG_CUBIC; |
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tag[2] = FT_STROKE_TAG_ON; |
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border->num_points += 3; |
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} |
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return error; |
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} |
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static FT_Error |
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ft_stroke_border_moveto( FT_StrokeBorder border, |
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FT_Vector* to ) |
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{ |
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FT_Error error; |
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/* close current open path if any ? */ |
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if ( border->start >= 0 ) |
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ft_stroke_border_close( border ); |
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border->start = border->num_points; |
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return ft_stroke_border_lineto( border, to ); |
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} |
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static void |
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ft_stroke_border_init( FT_StrokeBorder border, |
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FT_Memory memory ) |
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{ |
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border->memory = memory; |
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border->points = NULL; |
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border->tags = NULL; |
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border->num_points = 0; |
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border->max_points = 0; |
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border->start = -1; |
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} |
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static void |
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ft_stroke_border_reset( FT_StrokeBorder border ) |
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{ |
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border->num_points = 0; |
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border->start = -1; |
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} |
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static void |
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ft_stroke_border_done( FT_StrokeBorder border ) |
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{ |
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memory = border->memory; |
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FT_FREE( border->points ); |
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FT_FREE( border->tags ); |
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border->num_points = 0; |
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border->max_points = 0; |
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border->start = -1; |
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} |
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/***************************************************************************/ |
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/***************************************************************************/ |
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/***** *****/ |
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/***** STROKER *****/ |
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/***** *****/ |
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/***************************************************************************/ |
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/***************************************************************************/ |
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#define FT_SIDE_TO_ROTATE(s) (FT_PI2 - (s)*FT_PI) |
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typedef struct FT_StrokerRec_ |
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{ |
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FT_Angle angle_in; |
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FT_Angle angle_out; |
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FT_Vector center; |
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FT_Bool first_point; |
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FT_Bool subpath_open; |
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FT_Angle subpath_angle; |
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FT_Vector subpath_start; |
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FT_Stroker_LineCap line_cap; |
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FT_Stroker_LineJoin line_join; |
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FT_Fixed miter_limit; |
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FT_Fixed radius; |
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FT_StrokeBorderRec borders[2]; |
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FT_Memory memory; |
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} FT_StrokerRec; |
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FT_EXPORT_DEF( FT_Error ) |
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FT_Stroker_New( FT_Memory memory, |
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FT_Stroker *astroker ) |
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{ |
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FT_Error error; |
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FT_Stroker stroker; |
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if ( !FT_NEW( stroker ) ) |
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{ |
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stroker->memory = memory; |
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ft_stroke_border_init( &stroker->borders[0], memory ); |
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ft_stroke_border_init( &stroker->borders[1], memory ); |
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} |
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*astroker = stroker; |
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return error; |
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} |
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FT_EXPORT_DEF( void ) |
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FT_Stroker_Set( FT_Stroker stroker, |
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FT_Fixed radius, |
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FT_Stroker_LineCap line_cap, |
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FT_Stroker_LineJoin line_join, |
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FT_Fixed miter_limit ) |
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{ |
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stroker->radius = radius; |
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stroker->line_cap = line_cap; |
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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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} |
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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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if ( stroker ) |
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{ |
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FT_Memory memory = stroker->memory; |
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ft_stroke_border_done( &stroker->borders[0] ); |
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ft_stroke_border_done( &stroker->borders[1] ); |
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stroker->memory = NULL; |
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FT_FREE( stroker ); |
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} |
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} |
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