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[sdf] Add functions to decompose FT_Outline.

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* src/sdf/ftsdf.c (sdf_move_to, sdf_line_to, sdf_conic_to,
sdf_cubic_to): New auxiliary decomposition functions.
(sdf_compose_funcs): New structure.
(sdf_outline_decompose): New function.
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Anuj Verma 2020-08-17 16:36:30 +05:30 committed by Werner Lemberg
parent cf0464d855
commit 2de1b5630d
2 changed files with 208 additions and 0 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2020-08-17 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Add functions to decompose `FT_Outline`.
* src/sdf/ftsdf.c (sdf_move_to, sdf_line_to, sdf_conic_to,
sdf_cubic_to): New auxiliary decomposition functions.
(sdf_compose_funcs): New structure.
(sdf_outline_decompose): New function.
2020-08-17 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Structs, enums, macros, and functions for 'sdf' rasterizer.

199
src/sdf/ftsdf.c
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@ -643,4 +643,203 @@
SDF_FREE( *shape );
}
/**************************************************************************
*
* shape decomposition functions
*
*/
/* This function is called when starting a new contour at `to`, */
/* which gets added to the shape's list. */
static FT_Error
sdf_move_to( const FT_26D6_Vec* to,
void* user )
{
SDF_Shape* shape = ( SDF_Shape* )user;
SDF_Contour* contour = NULL;
FT_Error error = FT_Err_Ok;
FT_Memory memory = shape->memory;
if ( !to || !user )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
FT_CALL( sdf_contour_new( memory, &contour ) );
contour->last_pos = *to;
contour->next = shape->contours;
shape->contours = contour;
Exit:
return error;
}
/* This function is called when there is a line in the */
/* contour. The line starts at the previous edge point and */
/* stops at `to`. */
static FT_Error
sdf_line_to( const FT_26D6_Vec* to,
void* user )
{
SDF_Shape* shape = ( SDF_Shape* )user;
SDF_Edge* edge = NULL;
SDF_Contour* contour = NULL;
FT_Error error = FT_Err_Ok;
FT_Memory memory = shape->memory;
if ( !to || !user )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
contour = shape->contours;
if ( contour->last_pos.x == to->x &&
contour->last_pos.y == to->y )
goto Exit;
FT_CALL( sdf_edge_new( memory, &edge ) );
edge->edge_type = SDF_EDGE_LINE;
edge->start_pos = contour->last_pos;
edge->end_pos = *to;
edge->next = contour->edges;
contour->edges = edge;
contour->last_pos = *to;
Exit:
return error;
}
/* This function is called when there is a conic Bezier curve */
/* in the contour. The curve starts at the previous edge point */
/* and stops at `to`, with control point `control_1`. */
static FT_Error
sdf_conic_to( const FT_26D6_Vec* control_1,
const FT_26D6_Vec* to,
void* user )
{
SDF_Shape* shape = ( SDF_Shape* )user;
SDF_Edge* edge = NULL;
SDF_Contour* contour = NULL;
FT_Error error = FT_Err_Ok;
FT_Memory memory = shape->memory;
if ( !control_1 || !to || !user )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
contour = shape->contours;
FT_CALL( sdf_edge_new( memory, &edge ) );
edge->edge_type = SDF_EDGE_CONIC;
edge->start_pos = contour->last_pos;
edge->control_a = *control_1;
edge->end_pos = *to;
edge->next = contour->edges;
contour->edges = edge;
contour->last_pos = *to;
Exit:
return error;
}
/* This function is called when there is a cubic Bezier curve */
/* in the contour. The curve starts at the previous edge point */
/* and stops at `to`, with two control points `control_1` and */
/* `control_2`. */
static FT_Error
sdf_cubic_to( const FT_26D6_Vec* control_1,
const FT_26D6_Vec* control_2,
const FT_26D6_Vec* to,
void* user )
{
SDF_Shape* shape = ( SDF_Shape* )user;
SDF_Edge* edge = NULL;
SDF_Contour* contour = NULL;
FT_Error error = FT_Err_Ok;
FT_Memory memory = shape->memory;
if ( !control_2 || !control_1 || !to || !user )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
contour = shape->contours;
FT_CALL( sdf_edge_new( memory, &edge ) );
edge->edge_type = SDF_EDGE_CUBIC;
edge->start_pos = contour->last_pos;
edge->control_a = *control_1;
edge->control_b = *control_2;
edge->end_pos = *to;
edge->next = contour->edges;
contour->edges = edge;
contour->last_pos = *to;
Exit:
return error;
}
/* Construct the structure to hold all four outline */
/* decomposition functions. */
FT_DEFINE_OUTLINE_FUNCS(
sdf_decompose_funcs,
(FT_Outline_MoveTo_Func) sdf_move_to, /* move_to */
(FT_Outline_LineTo_Func) sdf_line_to, /* line_to */
(FT_Outline_ConicTo_Func)sdf_conic_to, /* conic_to */
(FT_Outline_CubicTo_Func)sdf_cubic_to, /* cubic_to */
0, /* shift */
0 /* delta */
)
/* Decompose `outline` and put it into the `shape` structure. */
static FT_Error
sdf_outline_decompose( FT_Outline* outline,
SDF_Shape* shape )
{
FT_Error error = FT_Err_Ok;
if ( !outline || !shape )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
error = FT_Outline_Decompose( outline,
&sdf_decompose_funcs,
(void*)shape );
Exit:
return error;
}
/* END */