forked from minhngoc25a/freetype2
[sdf] Added the interface functions for the `sdf' rasterizer.
* src/sdf/ftsdf.c (sdf_raster_): Added interface functions which are called from the FreeType core library to rasterize and do various other stuff with the rasterizer.
This commit is contained in:
Anuj Verma
parent
5cee930937
commit
8359cb3501
180
src/sdf/ftsdf.c
180
src/sdf/ftsdf.c
|
|
@ -3093,4 +3093,184 @@
|
|||
return error;
|
||||
}
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* interface functions
|
||||
*
|
||||
*/
|
||||
|
||||
static FT_Error
|
||||
sdf_raster_new( FT_Memory memory,
|
||||
FT_Raster* araster)
|
||||
{
|
||||
FT_Error error = FT_Err_Ok;
|
||||
SDF_TRaster* raster = NULL;
|
||||
FT_Int line = __LINE__;
|
||||
|
||||
|
||||
/* in non debugging mode this is not used */
|
||||
FT_UNUSED( line );
|
||||
|
||||
*araster = 0;
|
||||
if ( !FT_ALLOC( raster, sizeof( SDF_TRaster ) ) )
|
||||
{
|
||||
raster->memory = memory;
|
||||
*araster = (FT_Raster)raster;
|
||||
}
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
static void
|
||||
sdf_raster_reset( FT_Raster raster,
|
||||
unsigned char* pool_base,
|
||||
unsigned long pool_size )
|
||||
{
|
||||
/* no use of this function */
|
||||
FT_UNUSED( raster );
|
||||
FT_UNUSED( pool_base );
|
||||
FT_UNUSED( pool_size );
|
||||
}
|
||||
|
||||
static FT_Error
|
||||
sdf_raster_set_mode( FT_Raster raster,
|
||||
unsigned long mode,
|
||||
void* args )
|
||||
{
|
||||
FT_UNUSED( raster );
|
||||
FT_UNUSED( mode );
|
||||
FT_UNUSED( args );
|
||||
|
||||
|
||||
return FT_Err_Ok;
|
||||
}
|
||||
|
||||
static FT_Error
|
||||
sdf_raster_render( FT_Raster raster,
|
||||
const FT_Raster_Params* params )
|
||||
{
|
||||
FT_Error error = FT_Err_Ok;
|
||||
SDF_TRaster* sdf_raster = (SDF_TRaster*)raster;
|
||||
FT_Outline* outline = NULL;
|
||||
const SDF_Raster_Params* sdf_params = (const SDF_Raster_Params*)params;
|
||||
|
||||
FT_Memory memory = NULL;
|
||||
SDF_Shape* shape = NULL;
|
||||
SDF_Params internal_params;
|
||||
|
||||
SDF_MEMORY_TRACKER_DECLARE();
|
||||
|
||||
|
||||
/* check for valid arguments */
|
||||
if ( !sdf_raster || !sdf_params )
|
||||
{
|
||||
error = FT_THROW( Invalid_Argument );
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
outline = (FT_Outline*)sdf_params->root.source;
|
||||
|
||||
/* check if the outline is valid or not */
|
||||
if ( !outline )
|
||||
{
|
||||
error = FT_THROW( Invalid_Outline );
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
/* if the outline is empty, return */
|
||||
if ( outline->n_points <= 0 || outline->n_contours <= 0 )
|
||||
goto Exit;
|
||||
|
||||
/* check if the outline has valid fields */
|
||||
if ( !outline->contours || !outline->points )
|
||||
{
|
||||
error = FT_THROW( Invalid_Outline );
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
/* check if spread is set properly */
|
||||
if ( sdf_params->spread > MAX_SPREAD ||
|
||||
sdf_params->spread < MIN_SPREAD )
|
||||
{
|
||||
FT_TRACE0((
|
||||
"[sdf] sdf_raster_render:\n"
|
||||
" The `spread' field of `SDF_Raster_Params' is invalid,\n"
|
||||
" the value of this field must be within [%d, %d].\n"
|
||||
" Also, you must pass `SDF_Raster_Params' instead of the\n"
|
||||
" default `FT_Raster_Params' while calling this function\n"
|
||||
" and set the fields properly.\n"
|
||||
, MIN_SPREAD, MAX_SPREAD) );
|
||||
error = FT_THROW( Invalid_Argument );
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/* setup the params */
|
||||
internal_params.orientation = FT_Outline_Get_Orientation( outline );
|
||||
internal_params.flip_sign = sdf_params->flip_sign;
|
||||
internal_params.flip_y = sdf_params->flip_y;
|
||||
internal_params.overload_sign = 0;
|
||||
|
||||
/* assign a custom user pointer to `FT_Memory' */
|
||||
/* also keep a reference of the old user pointer */
|
||||
/* in order to debug the memory while compiling */
|
||||
/* with `FT_DEBUG_MEMORY'. */
|
||||
SDF_MEMORY_TRACKER_SETUP();
|
||||
|
||||
FT_CALL( sdf_shape_new( memory, &shape ) );
|
||||
|
||||
FT_CALL( sdf_outline_decompose( outline, shape ) );
|
||||
|
||||
if ( sdf_params->overlaps )
|
||||
FT_CALL( sdf_generate_with_overlaps( internal_params,
|
||||
shape, sdf_params->spread,
|
||||
sdf_params->root.target ) );
|
||||
else
|
||||
FT_CALL( sdf_generate_subdivision( internal_params,
|
||||
shape, sdf_params->spread,
|
||||
sdf_params->root.target ) );
|
||||
|
||||
if ( shape )
|
||||
sdf_shape_done( &shape );
|
||||
|
||||
/* restore the memory->user */
|
||||
SDF_MEMORY_TRACKER_DONE();
|
||||
|
||||
Exit:
|
||||
return error;
|
||||
}
|
||||
|
||||
static void
|
||||
sdf_raster_done( FT_Raster raster )
|
||||
{
|
||||
FT_Memory memory = (FT_Memory)((SDF_TRaster*)raster)->memory;
|
||||
FT_Int line = __LINE__;
|
||||
|
||||
/* in non debugging mode this is not used */
|
||||
FT_UNUSED( line );
|
||||
|
||||
FT_FREE( raster );
|
||||
}
|
||||
|
||||
FT_DEFINE_RASTER_FUNCS(
|
||||
ft_sdf_raster,
|
||||
|
||||
FT_GLYPH_FORMAT_OUTLINE,
|
||||
|
||||
(FT_Raster_New_Func) sdf_raster_new, /* raster_new */
|
||||
(FT_Raster_Reset_Func) sdf_raster_reset, /* raster_reset */
|
||||
(FT_Raster_Set_Mode_Func) sdf_raster_set_mode, /* raster_set_mode */
|
||||
(FT_Raster_Render_Func) sdf_raster_render, /* raster_render */
|
||||
(FT_Raster_Done_Func) sdf_raster_done /* raster_done */
|
||||
)
|
||||
|
||||
/* END */
|
||||
|
|
|
|||
Loading…
Reference in New Issue