[sdf] Added functions to decompose `FT_Outline'.
* src/sdf/ftsdf.c (sdf_outline_decompose): Added a function which decompose a `FT_Outline' using `FT_Outline_Decompose' and adds the outline data to a `SDF_Shape' for easier handling later on.
This commit is contained in:
Anuj Verma
parent
286fc7e42c
commit
e4e81c0168
195
src/sdf/ftsdf.c
195
src/sdf/ftsdf.c
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@ -602,4 +602,199 @@
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SDF_FREE( *shape );
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}
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/**************************************************************************
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*
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* shape decomposition functions
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*
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*/
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/* This function is called when walking along a new contour */
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/* so add a new contour to the shape's list. */
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static FT_Error
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sdf_move_to( const FT_26D6_Vec* to,
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void* user )
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{
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SDF_Shape* shape = ( SDF_Shape* )user;
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SDF_Contour* contour = NULL;
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FT_Error error = FT_Err_Ok;
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FT_Memory memory = shape->memory;
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if ( !to || !user )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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FT_CALL( sdf_contour_new( memory, &contour ) );
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contour->last_pos = *to;
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contour->next = shape->contours;
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shape->contours = contour;
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Exit:
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return error;
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}
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/* This function is called when there is a line in the */
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/* contour. The line is from the previous edge point to */
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/* the parameter `to'. */
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static FT_Error
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sdf_line_to( const FT_26D6_Vec* to,
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void* user )
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{
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SDF_Shape* shape = ( SDF_Shape* )user;
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SDF_Edge* edge = NULL;
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SDF_Contour* contour = NULL;
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FT_Error error = FT_Err_Ok;
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FT_Memory memory = shape->memory;
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if ( !to || !user )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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contour = shape->contours;
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if ( contour->last_pos.x == to->x &&
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contour->last_pos.y == to->y )
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goto Exit;
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FT_CALL( sdf_edge_new( memory, &edge ) );
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edge->edge_type = SDF_EDGE_LINE;
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edge->start_pos = contour->last_pos;
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edge->end_pos = *to;
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edge->next = contour->edges;
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contour->edges = edge;
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contour->last_pos = *to;
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Exit:
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return error;
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}
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/* This function is called when there is a conic bezier */
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/* curve in the contour. The bezier is from the previous */
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/* edge point to the parameter `to' with the control */
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/* point being `control_1'. */
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static FT_Error
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sdf_conic_to( const FT_26D6_Vec* control_1,
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const FT_26D6_Vec* to,
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void* user )
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{
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SDF_Shape* shape = ( SDF_Shape* )user;
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SDF_Edge* edge = NULL;
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SDF_Contour* contour = NULL;
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FT_Error error = FT_Err_Ok;
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FT_Memory memory = shape->memory;
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if ( !control_1 || !to || !user )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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contour = shape->contours;
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FT_CALL( sdf_edge_new( memory, &edge ) );
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edge->edge_type = SDF_EDGE_CONIC;
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edge->start_pos = contour->last_pos;
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edge->control_a = *control_1;
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edge->end_pos = *to;
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edge->next = contour->edges;
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contour->edges = edge;
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contour->last_pos = *to;
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Exit:
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return error;
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}
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/* This function is called when there is a cubic bezier */
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/* curve in the contour. The bezier is from the previous */
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/* edge point to the parameter `to' with one control */
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/* point being `control_1' and another `control_2'. */
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static FT_Error
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sdf_cubic_to( const FT_26D6_Vec* control_1,
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const FT_26D6_Vec* control_2,
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const FT_26D6_Vec* to,
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void* user )
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{
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SDF_Shape* shape = ( SDF_Shape* )user;
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SDF_Edge* edge = NULL;
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SDF_Contour* contour = NULL;
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FT_Error error = FT_Err_Ok;
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FT_Memory memory = shape->memory;
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if ( !control_2 || !control_1 || !to || !user )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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contour = shape->contours;
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FT_CALL( sdf_edge_new( memory, &edge ) );
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edge->edge_type = SDF_EDGE_CUBIC;
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edge->start_pos = contour->last_pos;
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edge->control_a = *control_1;
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edge->control_b = *control_2;
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edge->end_pos = *to;
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edge->next = contour->edges;
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contour->edges = edge;
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contour->last_pos = *to;
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Exit:
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return error;
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}
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/* Construct the struct to hold all four outline */
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/* decomposition functions. */
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FT_DEFINE_OUTLINE_FUNCS(
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sdf_decompose_funcs,
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(FT_Outline_MoveTo_Func) sdf_move_to, /* move_to */
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(FT_Outline_LineTo_Func) sdf_line_to, /* line_to */
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(FT_Outline_ConicTo_Func) sdf_conic_to, /* conic_to */
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(FT_Outline_CubicTo_Func) sdf_cubic_to, /* cubic_to */
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0, /* shift */
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0 /* delta */
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)
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/* The function decomposes the outline and puts it */
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/* into the `shape' struct. */
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static FT_Error
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sdf_outline_decompose( FT_Outline* outline,
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SDF_Shape* shape )
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{
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FT_Error error = FT_Err_Ok;
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if ( !outline || !shape )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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error = FT_Outline_Decompose( outline,
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&sdf_decompose_funcs,
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(void*)shape );
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Exit:
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return error;
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}
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/* END */
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