[sdf] Started the `bsdf' rasterier.
* src/sdf/ftbsdf.c (*): Fix line endings. * src/sdf/ftbsdf.c (bsdf_copy_source_to_target): Added function to copy the source bitmap to the center of the target bitmap and also convert it to normalized 16 bits per pixel bitmap.
This commit is contained in:
Anuj Verma
anujverma
parent
1d51c5ef7b
commit
2c77a8acb2
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@ -1,3 +1,14 @@
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2020-07-24 Anuj Verma <anujv@iitbhilai.ac.in>
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[sdf] Started the `bsdf' rasterier.
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* src/sdf/ftbsdf.c (*): Fix line endings.
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* src/sdf/ftbsdf.c (bsdf_copy_source_to_target): Added
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function to copy the source bitmap to the center of
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the target bitmap and also convert it to normalized
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16 bits per pixel bitmap.
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2020-07-19 Anuj Verma <anujv@iitbhilai.ac.in>
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[sdf] Added interface functions for `bsdf' converter.
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318
src/sdf/ftbsdf.c
318
src/sdf/ftbsdf.c
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@ -1,76 +1,242 @@
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftdebug.h>
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#include "ftsdf.h"
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#include "ftsdferrs.h"
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/**************************************************************************
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*
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* interface functions
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*
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*/
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static FT_Error
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bsdf_raster_new( FT_Memory memory,
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FT_Raster* araster)
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{
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FT_UNUSED( memory );
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FT_UNUSED( araster );
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return FT_Err_Ok;
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}
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static void
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bsdf_raster_reset( FT_Raster raster,
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unsigned char* pool_base,
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unsigned long pool_size )
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{
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/* no use of this function */
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FT_UNUSED( raster );
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FT_UNUSED( pool_base );
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FT_UNUSED( pool_size );
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}
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static FT_Error
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bsdf_raster_set_mode( FT_Raster raster,
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unsigned long mode,
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void* args )
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{
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FT_UNUSED( raster );
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FT_UNUSED( mode );
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FT_UNUSED( args );
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return FT_Err_Ok;
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}
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static FT_Error
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bsdf_raster_render( FT_Raster raster,
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const FT_Raster_Params* params )
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{
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FT_UNUSED( raster );
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FT_UNUSED( params );
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return FT_THROW( Unimplemented_Feature ) ;
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}
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static void
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bsdf_raster_done( FT_Raster raster )
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{
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FT_UNUSED( raster );
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}
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FT_DEFINE_RASTER_FUNCS(
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ft_bitmap_sdf_raster,
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FT_GLYPH_FORMAT_BITMAP,
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(FT_Raster_New_Func) bsdf_raster_new, /* raster_new */
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(FT_Raster_Reset_Func) bsdf_raster_reset, /* raster_reset */
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(FT_Raster_Set_Mode_Func) bsdf_raster_set_mode, /* raster_set_mode */
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(FT_Raster_Render_Func) bsdf_raster_render, /* raster_render */
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(FT_Raster_Done_Func) bsdf_raster_done /* raster_done */
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)
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/* END */
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftdebug.h>
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#include "ftsdf.h"
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#include "ftsdferrs.h"
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/**************************************************************************
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*
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* useful macros
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*
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*/
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/* Convenient macro which calls the function */
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/* and returns if any error occurs. */
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#define FT_CALL( x ) do \
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{ \
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error = ( x ); \
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if ( error != FT_Err_Ok ) \
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goto Exit; \
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} while ( 0 )
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/**************************************************************************
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*
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* rasterizer functions
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*
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*/
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static FT_Error
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bsdf_copy_source_to_target( const FT_Bitmap* source,
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FT_Bitmap* target )
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{
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FT_Error error = FT_Err_Ok;
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FT_Bool is_monochrome = 0;
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FT_Int x_diff, y_diff;
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FT_Int num_channels;
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FT_Byte* t, s;
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/* again check the parameters (probably unnecessary) */
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if ( !source || !target )
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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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/* Because of the way we convert bitmap to SDF */
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/* i.e. aligning the source to the center of the */
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/* target, the target's width/rows must be checked */
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/* before copying. */
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if ( target->width < source->width ||
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target->rows < source->rows )
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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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/* check pixel mode */
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if ( source->pixel_mode == FT_PIXEL_MODE_NONE )
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{
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FT_ERROR(( "[bsdf] bsdf_copy_source_to_target: "
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"Invalid pixel mode of source bitmap" ));
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* make sure target bitmap is 16bpp */
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if ( target->pixel_mode != FT_PIXEL_MODE_GRAY16 )
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{
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FT_ERROR(( "[bsdf] bsdf_copy_source_to_target: "
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"Invalid pixel mode of target bitmap" ));
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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#ifdef FT_DEBUG_LEVEL_TRACE
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if ( source->pixel_mode == FT_PIXEL_MODE_MONO )
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{
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FT_TRACE0(( "[bsdf] bsdf_copy_source_to_target:\n"
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"The `bsdf' renderer can convert monochrome bitmap\n"
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"to SDF, but the results are not perfect because there\n"
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"is no way to approximate actual outline from monochrome\n"
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"bitmap. Consider using anti-aliased bitmap instead.\n" ));
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}
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#endif
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/* Calculate the difference in width and rows */
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/* of the target and source. */
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x_diff = target->width - source->width;
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y_diff = target->rows - source->rows;
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x_diff /= 2;
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y_diff /= 2;
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t = target->buffer;
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s = source->buffer;
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/* For now we only support pixel mode `FT_PIXEL_MODE_MONO' */
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/* and `FT_PIXEL_MODE_GRAY'. More will be added later. */
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/* [NOTE]: We can also use `FT_Bitmap_Convert' to convert */
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/* bitmap to 8bpp. To avoid extra allocation and */
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/* since the target bitmap can be 16bpp we manually */
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/* convert the source bitmap to desired bpp. */
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switch ( source->pixel_mode ) {
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case FT_PIXEL_MODE_MONO:
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/* [TODO] */
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error = FT_THROW( Unimplemented_Feature );
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break;
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case FT_PIXEL_MODE_GRAY:
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/* [TODO] */
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error = FT_THROW( Unimplemented_Feature );
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break;
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default:
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FT_ERROR(( "[bsdf] bsdf_copy_source_to_target: "
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"unsopported pixel mode of source bitmap\n" ));
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error = FT_THROW( Unimplemented_Feature );
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break;
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}
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Exit:
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return error;
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}
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/**************************************************************************
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*
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* interface functions
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*
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*/
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static FT_Error
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bsdf_raster_new( FT_Memory memory,
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FT_Raster* araster)
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{
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FT_UNUSED( memory );
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FT_UNUSED( araster );
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return FT_Err_Ok;
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}
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static void
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bsdf_raster_reset( FT_Raster raster,
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unsigned char* pool_base,
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unsigned long pool_size )
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{
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/* no use of this function */
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FT_UNUSED( raster );
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FT_UNUSED( pool_base );
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FT_UNUSED( pool_size );
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}
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static FT_Error
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bsdf_raster_set_mode( FT_Raster raster,
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unsigned long mode,
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void* args )
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{
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FT_UNUSED( raster );
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FT_UNUSED( mode );
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FT_UNUSED( args );
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return FT_Err_Ok;
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}
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static FT_Error
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bsdf_raster_render( FT_Raster raster,
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const FT_Raster_Params* params )
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{
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FT_Error error = FT_Err_Ok;
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FT_Bitmap* source = NULL;
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FT_Bitmap* target = NULL;
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const SDF_Raster_Params* sdf_params = (const SDF_Raster_Params*)params;
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FT_UNUSED( raster );
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/* check for valid parameters */
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if ( !params )
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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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/* check if the flag is set */
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if ( sdf_params->root.flags != FT_RASTER_FLAG_SDF )
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{
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error = FT_THROW( Raster_Corrupted );
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goto Exit;
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}
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source = sdf_params->root.source;
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target = sdf_params->root.target;
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/* check the source and target bitmap */
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if ( !source || !target )
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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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/* check if spread is set properly */
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if ( sdf_params->spread > MAX_SPREAD ||
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sdf_params->spread < MIN_SPREAD )
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{
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FT_TRACE0((
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"[bsdf] bsdf_raster_render:\n"
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" The `spread' field of `SDF_Raster_Params' is invalid,\n"
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" the value of this field must be within [%d, %d].\n"
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" Also, you must pass `SDF_Raster_Params' instead of the\n"
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" default `FT_Raster_Params' while calling this function\n"
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" and set the fields properly.\n"
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, MIN_SPREAD, MAX_SPREAD) );
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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( bsdf_copy_source_to_target( source, target ) );
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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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bsdf_raster_done( FT_Raster raster )
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{
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FT_UNUSED( raster );
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}
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FT_DEFINE_RASTER_FUNCS(
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ft_bitmap_sdf_raster,
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FT_GLYPH_FORMAT_BITMAP,
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(FT_Raster_New_Func) bsdf_raster_new, /* raster_new */
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(FT_Raster_Reset_Func) bsdf_raster_reset, /* raster_reset */
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(FT_Raster_Set_Mode_Func) bsdf_raster_set_mode, /* raster_set_mode */
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(FT_Raster_Render_Func) bsdf_raster_render, /* raster_render */
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(FT_Raster_Done_Func) bsdf_raster_done /* raster_done */
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)
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/* END */
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