From ed7d2f5789c2a2772e965ded51ced909f67185eb Mon Sep 17 00:00:00 2001 From: Anuj Verma Date: Mon, 17 Aug 2020 11:47:26 +0530 Subject: [PATCH] [sdf] Added the `sdf' renderer. * src/sdf/ftsdf.c (*): Added `sdf' renderer along with it's interface functions and functions to set and get properties. --- src/sdf/ftsdfrend.c | 398 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 398 insertions(+) diff --git a/src/sdf/ftsdfrend.c b/src/sdf/ftsdfrend.c index 93a4c65b0..1a2797c88 100644 --- a/src/sdf/ftsdfrend.c +++ b/src/sdf/ftsdfrend.c @@ -1,3 +1,401 @@ +#include +#include +#include +#include +#include +#include "ftsdfrend.h" +#include "ftsdf.h" + +#include "ftsdferrs.h" + + /************************************************************************** + * + * The macro FT_COMPONENT is used in trace mode. It is an implicit + * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log + * messages during execution. + */ + #undef FT_COMPONENT + #define FT_COMPONENT sdf + + /************************************************************************** + * + * macros and default property values + * + */ + + #define SDF_RENDERER( rend ) ( (SDF_Renderer)rend ) + + /************************************************************************** + * + * for setting properties + * + */ + + /* property setter function */ + static FT_Error + sdf_property_set( FT_Module module, + const char* property_name, + const void* value, + FT_Bool value_is_string ) + { + FT_Error error = FT_Err_Ok; + SDF_Renderer render = SDF_RENDERER( FT_RENDERER( module ) ); + + + FT_UNUSED( value_is_string ); + + if ( ft_strcmp( property_name, "spread" ) == 0 ) + { + FT_Int val = *(const FT_Int*)value; + + + if ( val > MAX_SPREAD || val < MIN_SPREAD ) + { + FT_TRACE0(( "[sdf] sdf_property_set: " + "the `spread' property can have a " + "value within range [%d, %d] (value provided %d)\n", + MIN_SPREAD, MAX_SPREAD, val )); + error = FT_THROW( Invalid_Argument ); + goto Exit; + } + render->spread = (FT_UInt)val; + FT_TRACE7(( "[sdf] sdf_property_set: " + "updated property `spread' to %d\n", val )); + } + else if ( ft_strcmp( property_name, "flip_sign" ) == 0 ) + { + FT_Int val = *(const FT_Int*)value; + + + render->flip_sign = val ? 1 : 0; + FT_TRACE7(( "[sdf] sdf_property_set: " + "updated property `flip_sign' to %d\n", val )); + } + else if ( ft_strcmp( property_name, "flip_y" ) == 0 ) + { + FT_Int val = *(const FT_Int*)value; + + + render->flip_y = val ? 1 : 0; + FT_TRACE7(( "[sdf] sdf_property_set: " + "updated property `flip_y' to %d\n", val )); + } + else if ( ft_strcmp( property_name, "overlaps" ) == 0 ) + { + FT_Int val = *(const FT_Int*)value; + + + render->overlaps = val; + FT_TRACE7(( "[sdf] sdf_property_set: " + "updated property `overlaps' to %d\n", val )); + } + else + { + FT_TRACE0(( "[sdf] sdf_property_set: " + "missing property `%s'\n", property_name )); + error = FT_THROW( Missing_Property ); + } + + Exit: + return error; + } + + /* property getter function */ + static FT_Error + sdf_property_get( FT_Module module, + const char* property_name, + void* value ) + { + FT_Error error = FT_Err_Ok; + SDF_Renderer render = SDF_RENDERER( FT_RENDERER( module ) ); + + + if ( ft_strcmp( property_name, "spread" ) == 0 ) + { + FT_Int* val = (FT_Int*)value; + + + *val = render->spread; + } + else if ( ft_strcmp( property_name, "flip_sign" ) == 0 ) + { + FT_Int* val = (FT_Int*)value; + + + *val = render->flip_sign; + } + else if ( ft_strcmp( property_name, "flip_y" ) == 0 ) + { + FT_Int* val = (FT_Int*)value; + + + *val = render->flip_y; + } + else if ( ft_strcmp( property_name, "overlaps" ) == 0 ) + { + FT_Int* val = (FT_Int*)value; + + + *val = render->overlaps; + } + else + { + FT_TRACE0(( "[sdf] sdf_property_get: " + "missing property `%s'\n", property_name )); + error = FT_THROW( Missing_Property ); + } + + return error; + } + + FT_DEFINE_SERVICE_PROPERTIESREC( + sdf_service_properties, + + (FT_Properties_SetFunc)sdf_property_set, /* set_property */ + (FT_Properties_GetFunc)sdf_property_get ) /* get_property */ + + + FT_DEFINE_SERVICEDESCREC1( + sdf_services, + + FT_SERVICE_ID_PROPERTIES, &sdf_service_properties ) + + static FT_Module_Interface + ft_sdf_requester( FT_Renderer render, + const char* module_interface ) + { + FT_UNUSED( render ); + + return ft_service_list_lookup( sdf_services, module_interface ); + } + + /************************************************************************** + * + * interface functions + * + */ + + static FT_Error + ft_sdf_init( FT_Renderer render ) + { + SDF_Renderer sdf_render = SDF_RENDERER( render ); + + + sdf_render->spread = DEFAULT_SPREAD; + sdf_render->flip_sign = 0; + sdf_render->flip_y = 0; + sdf_render->overlaps = 0; + + return FT_Err_Ok; + } + + static FT_Error + ft_sdf_done( FT_Renderer render ) + { + FT_UNUSED( render ); + + return FT_Err_Ok; + } + + /* generate signed distance field from a glyph's slot image */ + static FT_Error + ft_sdf_render( FT_Renderer module, + FT_GlyphSlot slot, + FT_Render_Mode mode, + const FT_Vector* origin ) + { + FT_Error error = FT_Err_Ok; + FT_Outline* outline = &slot->outline; + FT_Bitmap* bitmap = &slot->bitmap; + FT_Memory memory = NULL; + FT_Renderer render = NULL; + FT_Pos x_shift = 0; + FT_Pos y_shift = 0; + + FT_Pos x_pad = 0; + FT_Pos y_pad = 0; + + SDF_Raster_Params params; + SDF_Renderer sdf_module = SDF_RENDERER( module ); + + + render = &sdf_module->root; + memory = render->root.memory; + + /* check if slot format is correct before rendering */ + if ( slot->format != render->glyph_format ) + { + error = FT_THROW( Invalid_Glyph_Format ); + goto Exit; + } + + /* check if render mode is correct */ + if ( mode != FT_RENDER_MODE_SDF ) + { + FT_ERROR(( "[sdf] ft_sdf_render: " + "sdf module only render when " + "using `FT_RENDER_MODE_SDF'\n" )); + error = FT_THROW( Cannot_Render_Glyph ); + goto Exit; + } + + /* deallocate the previously allocated bitmap */ + if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) + { + FT_FREE( bitmap->buffer ); + slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; + } + + /* preset the bitmap using the glyph's outline; */ + /* the sdf bitmap is similar to an antialiased bitmap */ + /* with a slightly bigger size and different pixel mode */ + if ( ft_glyphslot_preset_bitmap( slot, FT_RENDER_MODE_NORMAL, origin ) ) + { + error = FT_THROW( Raster_Overflow ); + goto Exit; + } + + if ( !bitmap->rows || !bitmap->pitch ) + goto Exit; + + /* the padding will simply be equal to the `spread' */ + x_pad = sdf_module->spread; + y_pad = sdf_module->spread; + + /* apply the padding, will be in all the directions */ + bitmap->rows += y_pad * 2; + bitmap->width += x_pad * 2; + + /* ignore the pitch, pixel mode and set custom */ + bitmap->pixel_mode = FT_PIXEL_MODE_GRAY16; + bitmap->pitch = bitmap->width * 2; + bitmap->num_grays = 65535; + + /* allocate new buffer */ + if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) ) + goto Exit; + + slot->internal->flags |= FT_GLYPH_OWN_BITMAP; + + x_shift = 64 * -( slot->bitmap_left - x_pad ); + y_shift = 64 * -( slot->bitmap_top + y_pad ); + y_shift += 64 * (FT_Int)bitmap->rows; + + if ( origin ) + { + x_shift += origin->x; + y_shift += origin->y; + } + + /* translate outline to render it into the bitmap */ + if ( x_shift || y_shift ) + FT_Outline_Translate( outline, x_shift, y_shift ); + + /* set up parameters */ + params.root.target = bitmap; + params.root.source = outline; + params.root.flags = FT_RASTER_FLAG_SDF; + params.spread = sdf_module->spread; + params.flip_sign = sdf_module->flip_sign; + params.flip_y = sdf_module->flip_y; + params.overlaps = sdf_module->overlaps; + + /* render the outline */ + error = render->raster_render( render->raster, (const FT_Raster_Params*)¶ms ); + + Exit: + if ( !error ) + { + /* the glyph is successfully rendered to a bitmap */ + slot->format = FT_GLYPH_FORMAT_BITMAP; + } + else if ( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) + { + FT_FREE( bitmap->buffer ); + slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP; + } + + if ( x_shift || y_shift ) + FT_Outline_Translate( outline, -x_shift, -y_shift ); + + return error; + } + + /* transform the glyph using matrix and/or delta */ + static FT_Error + ft_sdf_transform( FT_Renderer render, + FT_GlyphSlot slot, + const FT_Matrix* matrix, + const FT_Vector* delta ) + { + FT_Error error = FT_Err_Ok; + + + if ( slot->format != render->glyph_format ) + { + error = FT_THROW( Invalid_Argument ); + goto Exit; + } + + if ( matrix ) + FT_Outline_Transform( &slot->outline, matrix ); + + if ( delta ) + FT_Outline_Translate( &slot->outline, delta->x, delta->y ); + + Exit: + return error; + } + + /* returns the control box of glyph's outline */ + static void + ft_sdf_get_cbox( FT_Renderer render, + FT_GlyphSlot slot, + FT_BBox* cbox ) + { + FT_ZERO( cbox ); + + if ( slot->format == render->glyph_format ) + FT_Outline_Get_CBox( &slot->outline, cbox ); + } + + /* set render specific modes or attributes */ + static FT_Error + ft_sdf_set_mode( FT_Renderer render, + FT_ULong mode_tag, + FT_Pointer data ) + { + /* pass it to the rasterizer */ + return render->clazz->raster_class->raster_set_mode( render->raster, + mode_tag, + data ); + } + + FT_DEFINE_RENDERER( + ft_sdf_renderer_class, + + FT_MODULE_RENDERER, + sizeof( SDF_Renderer_Module ), + + "sdf", + 0x10000L, + 0x20000L, + + NULL, + + (FT_Module_Constructor) ft_sdf_init, + (FT_Module_Destructor) ft_sdf_done, + (FT_Module_Requester) ft_sdf_requester, + + FT_GLYPH_FORMAT_OUTLINE, + + (FT_Renderer_RenderFunc) ft_sdf_render, /* render_glyph */ + (FT_Renderer_TransformFunc) ft_sdf_transform, /* transform_glyph */ + (FT_Renderer_GetCBoxFunc) ft_sdf_get_cbox, /* get_glyph_cbox */ + (FT_Renderer_SetModeFunc) ft_sdf_set_mode, /* set_mode */ + + (FT_Raster_Funcs*)&ft_sdf_raster /* raster_class */ + ) /* END */