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* src/sdf/ftsdf.c: Manually iterate through the lists.

This commit is contained in:
Anuj Verma 2020-06-28 17:02:28 +05:30 committed by anujverma
parent e9fce03032
commit 186cc478ae
2 changed files with 101 additions and 47 deletions
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9
[GSoC]ChangeLog
View File

@ -1,3 +1,12 @@
2020-06-27 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (SDF_Iterator_IO): Removed.
* src/sdf/ftsdf.c (sdf_edge_iterator_func => sdf_edge_get_min_distance
sdf_contour_iterator_func => sdf_contour_get_min_distance): Renamed.
Manually iterate through the lists instead of `FT_List_Iterate' to
avoid io structs and looks a bit cleaner.
2020-06-27 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added basic outline of the functions required to

139
src/sdf/ftsdf.c
View File

@ -14,6 +14,16 @@
#define FT_INT_26D6( x ) ( x * 64 ) /* convert int to 26.6 fixed point */
/* Convenient macro which calls the function */
/* and returns if any error occurs. */
#define FT_CALL( x ) do \
{ \
error = ( x ); \
if ( error != FT_Err_Ok ) \
goto Exit; \
} while ( 0 )
/**************************************************************************
*
* typedefs
@ -102,15 +112,6 @@
} SDF_Signed_Distance;
/* This struct servers as both input and output while */
/* iterating through the contours and edges. */
typedef struct SDF_Iterator_IO_
{
FT_26D6_Vec current_point; /* input */
SDF_Signed_Distance shortest_point; /* output */
} SDF_Iterator_IO;
/**************************************************************************
*
* constants, initializer and destructor
@ -132,8 +133,8 @@
const SDF_Shape null_shape = { NULL, { NULL, NULL } };
static
const SDF_Signed_Distance max_sdf_dist = { { 0, 0 }, { 0, 0 },
FT_INT_MAX, 0 };
const SDF_Signed_Distance max_sdf = { { 0, 0 }, { 0, 0 },
INT_MAX, 0 };
/* Creates a new `SDF_Edge' on the heap and assigns the `edge' */
/* pointer to the newly allocated memory. */
@ -606,14 +607,11 @@
/**************************************************************************
*
* @Function:
* sdf_edge_iterator_func
* sdf_edge_get_min_distance
*
* @Description:
* This function find the shortest distance from a point to
* a given point. The function assign the output if current edge
* distance is smaller than the output. Make sure to assign max
* distance to io.shortest_point before calling the iterator first
* time.
* This function find the shortest distance from the `edge' to
* a given `point' and assigns it to `out'.
*
* @Input:
* [TODO]
@ -622,19 +620,28 @@
* [TODO]
*/
static FT_Error
sdf_edge_iterator_func( FT_ListNode node,
void* user )
sdf_edge_get_min_distance( SDF_Edge* edge,
FT_26D6_Vec point,
SDF_Signed_Distance* out)
{
FT_Error error = FT_Err_Ok;
SDF_Iterator_IO* io = (SDF_Iterator_IO*)user;
if ( !node || !user )
if ( !edge || !out )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* edge specific distance calculation */
switch ( edge->edge_type ) {
case SDF_EDGE_LINE:
case SDF_EDGE_CONIC:
case SDF_EDGE_CUBIC:
default:
error = FT_THROW( Invalid_Argument );
}
Exit:
return error;
}
@ -642,14 +649,12 @@
/**************************************************************************
*
* @Function:
* sdf_contour_iterator_func
* sdf_contour_get_min_distance
*
* @Description:
* This function iterate through all the edges that make up
* the contour and find the shortest distance from a point to
* this contour. The function assign the output if any edge distance
* is smaller than the output. Make sure to assign max distance to
* io.shortest_point before calling the iterator for the first time.
* this contour and assigns it to `out'.
*
* @Input:
* [TODO]
@ -658,18 +663,39 @@
* [TODO]
*/
static FT_Error
sdf_contour_iterator_func( FT_ListNode node,
void* user )
sdf_contour_get_min_distance( SDF_Contour* contuor,
FT_26D6_Vec point,
SDF_Signed_Distance* out)
{
FT_Error error = FT_Err_Ok;
SDF_Iterator_IO* io = (SDF_Iterator_IO*)user;
FT_Error error = FT_Err_Ok;
SDF_Signed_Distance min_dist = max_sdf;
FT_ListRec edge_list;
if ( !node || !user )
if ( !contuor || !out )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
edge_list = contuor->edges;
/* iterate through all the edges manually */
while ( edge_list.head ) {
SDF_Signed_Distance current_dist = max_sdf;
FT_CALL( sdf_edge_get_min_distance(
(SDF_Edge*)edge_list.head->data,
point, &current_dist ) );
/* [TODO]: *IMPORTANT* Add corner checking function. */
if ( current_dist.distance < min_dist.distance )
min_dist = current_dist;
edge_list.head = edge_list.head->next;
}
Exit:
return error;
}
@ -740,7 +766,8 @@
/* from this point to the entire shape. */
FT_26D6_Vec grid_point = { FT_INT_26D6( x ),
FT_INT_26D6( y ) };
SDF_Iterator_IO arg;
SDF_Signed_Distance min_dist = max_sdf;
FT_ListRec contour_list;
/* This `grid_point' is at the corner, but we */
@ -748,18 +775,27 @@
grid_point.x += FT_INT_26D6( 1 ) / 2;
grid_point.y += FT_INT_26D6( 1 ) / 2;
arg.current_point = grid_point;
arg.shortest_point = max_sdf_dist;
contour_list = shape->contours;
/* [TODO]: iterate through all the contours */
/* iterate through all the contours manually */
while ( contour_list.head ) {
SDF_Signed_Distance current_dist = max_sdf;
/* [TODO]: Now check the returned distance and assign */
/* the values to the bitmap. */
FT_CALL( sdf_contour_get_min_distance(
(SDF_Contour*)contour_list.head->data,
grid_point, &current_dist ) );
if ( current_dist.distance < min_dist.distance )
min_dist = current_dist;
contour_list.head = contour_list.head->next;
}
}
}
Exit:
return FT_THROW( Unimplemented_Feature );
return error;
}
/**************************************************************************
@ -819,6 +855,9 @@
FT_Outline* outline = NULL;
const SDF_Raster_Params* sdf_params = (const SDF_Raster_Params*)params;
FT_Memory memory = NULL;
SDF_Shape* shape = NULL;
/* check for valid arguments */
if ( !sdf_raster || !sdf_params )
@ -863,23 +902,29 @@
goto Exit;
}
/* temporary */
memory = sdf_raster->memory;
if ( !memory )
{
FT_TRACE0(( "[sdf] sdf_raster_render:\n"
" Raster not setup properly, "
"unable to find memory handle.\n" ));
error = FT_THROW( Invalid_Handle );
goto Exit;
}
FT_Memory memory = sdf_raster->memory;
FT_CALL( sdf_shape_new( memory, &shape ) );
SDF_Shape * shape = NULL;
sdf_shape_new( memory, &shape );
FT_CALL( sdf_outline_decompose( outline, shape ) );
sdf_outline_decompose( outline, shape );
FT_CALL( sdf_generate( shape, sdf_params->spread,
sdf_params->root.target ) );
sdf_shape_dump( shape );
sdf_shape_done( memory, &shape );
/* --------- */
Exit:
error = FT_THROW( Unimplemented_Feature );
if ( shape )
sdf_shape_done( memory, &shape );
return error;
}