measured font — not working
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#lang racket/base
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(require ffi/unsafe
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ffi/unsafe/define
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racket/draw/private/libs)
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(define-syntax-rule (define+provide id val)
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(begin
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(define id val)
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(provide id)))
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(define-runtime-lib freetype-lib
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[(unix) #f] ; todo: get unix runtime path
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[(macosx) (ffi-lib "libfreetype.6.dylib")]
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[(windows) (ffi-lib "libfreetype-6.dll")])
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(define-ffi-definer define-freetype freetype-lib #:provide provide)
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;; types
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(define _void-pointer (_cpointer 'void-pointer))
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(define _char _byte)
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(define _char-pointer (_cpointer 'char-pointer))
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(define _uchar _ubyte)
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(define _FT_Byte _ubyte)
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(define _FT_Bytes _bytes)
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(define _FT_Char _char)
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(define _FT_Int _int)
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(define _FT_UInt _uint)
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(define _FT_Int16 _short)
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(define _FT_UInt16 _ushort)
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(define _FT_Int32 _int32)
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(define _FT_UInt32 _uint32)
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(define _FT_Short _short)
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(define _FT_UShort _ushort)
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(define _FT_Long _long)
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(define _FT_ULong _ulong)
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(define _FT_Bool _byte)
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(define _FT_Offset _size) ;; equivalent to _size_t?
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(define _FT_PtrDist _ptrdiff) ;; equivalent to _longlong?
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(define _FT_String _char)
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(define _FT_String-pointer (_cpointer 'FT_String-pointer)) ;; char*
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(define _FT_Tag _FT_UInt32)
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(define _FT_Error _int)
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(define _FT_Fixed _long)
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(define _FT_Pointer _void-pointer)
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(define _FT_Pos _long)
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(define _FT_FWord _short)
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(define _FT_UFWord _ushort)
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(define _FT_F26Dot16 _short)
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(define _FT_F26Dot6 _long)
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(define _FT_Glyph_Format _int)
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(define _FT_Encoding _int)
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(define _FT_Generic_Finalizer (_cpointer '_FT_Generic_Finalizer (_fun _void-pointer -> _void)))
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(define _FT_LibraryRec (_cpointer 'FT_LibraryRec))
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(define _FT_Library (_cpointer 'FT_Library))
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(define-cstruct _FT_Bitmap_Size
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([height _FT_Short]
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[width _FT_Short]
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[size _FT_Pos]
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[x_ppem _FT_Pos]
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[y_ppem _FT_Pos]))
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(define-cstruct _FT_CharMapRec
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([face _void-pointer] ; should be FT_Face
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[encoding _FT_Encoding]
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[platform_id _FT_UShort]
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[encoding_id _FT_UShort]))
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(define _FT_Charmap _FT_CharMapRec-pointer)
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(define _FT_CharMap-pointer (_cpointer 'FT_CharMap-pointer))
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(define-cstruct _FT_Generic
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([data _void-pointer]
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[finalizer _FT_Generic_Finalizer]))
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(define-cstruct _FT_BBox
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([xMin _FT_Pos]
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[yMin _FT_Pos]
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[xMax _FT_Pos]
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[yMax _FT_Pos]))
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(define-cstruct _FT_Glyph_Metrics
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([width _FT_Pos]
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[height _FT_Pos]
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[horiBearingX _FT_Pos]
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[horiBearingY _FT_Pos]
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[horiAdvance _FT_Pos]
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[vertBearingX _FT_Pos]
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[vertBearingY _FT_Pos]
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[vertAdvance _FT_Pos]))
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(define-cstruct _FT_Vector
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([x _FT_Pos]
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[y _FT_Pos]))
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(provide (struct-out FT_Vector)
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_FT_Vector _FT_Vector-pointer)
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(define-cstruct _FT_Bitmap
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([rows _int]
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[width _int]
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[pitch _int]
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[buffer (_cpointer 'buffer)]
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[num_grays _short]
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[pixel_mode _ubyte]
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[palette_mode _char]
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[palette _void-pointer]))
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(define-cstruct _FT_Outline
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([n_contours _short]
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[n_points _short]
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[points _FT_Vector-pointer]
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[tags (_cpointer 'tags)]
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[contours (_cpointer 'contours)]
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[flags _int]))
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(define-cstruct _FT_GlyphSlotRec
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([library _FT_Library]
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[face _void-pointer]
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[next _void-pointer]
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[reserved _uint]
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[generic _FT_Generic]
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[metrics _FT_Glyph_Metrics]
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[linearHoriAdvance _FT_Fixed]
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[linearVertAdvance _FT_Fixed]
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[advance _FT_Vector]
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[format _FT_Glyph_Format]
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[bitmap _FT_Bitmap]
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[bitmap_left _FT_Int]
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[bitmap_top _FT_Int]
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[outline _FT_Outline]
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[num_subglyphs _FT_UInt]
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[subglyphs _void-pointer]
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[control_data _void-pointer]
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[control_len _long]
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[lsb_delta _FT_Pos]
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[rsb_delta _FT_Pos]
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[other _void-pointer]
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[internal _void-pointer]))
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(define _FT_GlyphSlot _FT_GlyphSlotRec-pointer)
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(provide (struct-out FT_GlyphSlotRec)
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_FT_GlyphSlotRec _FT_GlyphSlotRec-pointer)
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(define-cstruct _FT_Size_Metrics
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([x_ppem _FT_UShort]
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[y_ppem _FT_UShort]
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[x_scale _FT_Fixed]
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[y_scale _FT_Fixed]
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[ascender _FT_Pos]
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[descender _FT_Pos]
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[height _FT_Pos]
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[max_advance _FT_Pos]))
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(define-cstruct _FT_SizeRec
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([face _void-pointer]
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[generic _FT_Generic]
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[metrics _FT_Size_Metrics]
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[internal _void-pointer]))
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(define _FT_Size _FT_SizeRec-pointer)
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(define-cstruct _FT_FaceRec
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([num_faces _FT_Long]
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[face_index _FT_Long]
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[face_flag _FT_Long]
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[style_flags _FT_Long]
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[num_glyphs _FT_Long]
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[family_name _string] ; probably _string is a better choice
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[style_name _string]
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[num_fixed_sizes _FT_Int]
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[available_sizes _FT_Bitmap_Size-pointer]
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[num_charmaps _FT_Int]
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[charmaps _FT_CharMap-pointer]
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[generic _FT_Generic]
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[bbox _FT_BBox]
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[units_per_EM _FT_UShort]
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[ascender _FT_Short]
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[descender _FT_Short]
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[height _FT_Short]
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[max_advance_width _FT_Short]
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[max_advance_height _FT_Short]
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[underline_position _FT_Short]
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[underline_thickness _FT_Short]
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[glyph _FT_GlyphSlot]
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[size _FT_Size]
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[charmap _FT_Charmap]
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[driver _void-pointer]
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[memory _void-pointer]
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[stream _void-pointer]
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[sizes_list_head _void-pointer]
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[sizes_list_tail _void-pointer]
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[autohint _FT_Generic]
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[extensions _void-pointer]
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[internal _void-pointer]))
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(define _FT_Face _FT_FaceRec-pointer)
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(provide (struct-out FT_FaceRec)
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_FT_FaceRec _FT_FaceRec-pointer)
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(define _full-path
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(make-ctype _path
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path->complete-path
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values))
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(define-freetype FT_Init_FreeType (_fun (ftl : (_ptr o _FT_Library))
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-> (err : _FT_Error)
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-> (if (zero? err) ftl (error 'FT_Init_FreeType))))
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(define-freetype FT_New_Face (_fun _FT_Library _full-path _FT_Long
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(ftf : (_ptr o (_or-null _FT_Face)))
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-> (err : _FT_Error)
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-> (if (zero? err) ftf (error 'FT_New_Face (format "error ~a" err)))))
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(define-freetype FT_Done_Face (_fun _FT_Face
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-> (err : _FT_Error)
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-> (unless (zero? err) (error 'FT_Done_Face (format "error ~a" err)))))
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(define-freetype FT_Done_FreeType (_fun _FT_Library -> (err : _FT_Error) -> (if (zero? err) (void) (error 'FT_Done_FreeType))))
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(define-freetype FT_Get_Kerning (_fun _FT_Face _FT_UInt _FT_UInt _FT_UInt
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(ftv : (_ptr o _FT_Vector))
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-> (err : _FT_Error)
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-> (if (zero? err) ftv (error 'FT_Get_Kerning (format "error ~a" err)))))
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(define-freetype FT_Get_Char_Index (_fun _FT_Face _FT_ULong
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-> _FT_UInt))
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(define-freetype FT_Load_Glyph (_fun _FT_Face _FT_UInt _FT_Int32
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-> (err : _FT_Error)))
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(define-freetype FT_Load_Char (_fun _FT_Face _FT_ULong _FT_Int32
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-> (err : _FT_Error)))
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(define+provide FT_KERNING_UNSCALED 2)
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(define+provide FT_LOAD_DEFAULT 0)
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(define+provide FT_LOAD_RENDER (expt 2 2))
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(define+provide FT_LOAD_LINEAR_DESIGN (expt 2 13))
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(define+provide FT_LOAD_NO_RECURSE (expt 2 10))
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@ -0,0 +1,31 @@
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#lang br
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(require "freetype-ffi.rkt")
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(provide (all-defined-out))
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(define ft-library (FT_Init_FreeType))
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(define ft-face-cache (make-hash))
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(define (font-pathstring->ft-face font-pathstring)
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(hash-ref! ft-face-cache font-pathstring
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(λ ()
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(unless (file-exists? font-pathstring)
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(error 'measure-char (format "font path ~v does not exist" font-pathstring)))
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(FT_New_Face ft-library font-pathstring 0))))
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(define (get-glyph-idx font-pathstring char)
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(FT_Get_Char_Index (font-pathstring->ft-face font-pathstring) (char->integer char)))
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(define (measure-char font-pathstring char)
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(measure-char-idx font-pathstring (get-glyph-idx font-pathstring char)))
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(define (measure-char-idx font-pathstring glyph-idx)
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(define ft-face (font-pathstring->ft-face font-pathstring))
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(FT_Load_Glyph ft-face glyph-idx FT_LOAD_NO_RECURSE) ; loads into FTFace's 'glyph' slot
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(define width (FT_Vector-x (FT_GlyphSlotRec-advance (FT_FaceRec-glyph ft-face))))
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width)
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(module+ test
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(require rackunit)
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(check-equal? (measure-char "miso.otf" #\f) 296)
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(check-equal? (measure-char-idx "miso.otf" 46) 296))
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@ -0,0 +1,87 @@
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#lang at-exp s-exp pitfall/render
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;; catalog object
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(co-io 1 0 (co-catalog #:pages (co-io-ref 2 0)))
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;; pages
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(co-io 2 0 (co-pages #:kids (list (co-io-ref 3 0))
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#:count 1))
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;; page
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(co-io 3 0 (co-page #:parent (co-io-ref 2 0)
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#:mediabox '(0 0 400 400)
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#:resources (co-io-ref 4 0)
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#:contents (co-io-ref 5 0)
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; the value of annots must be an array
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#:annots (co-array (list (co-io-ref 7 0)))
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))
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#;#:annots (co-io-ref 7 0)
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;; resources
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(co-io 4 0
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(make-co-dict
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'ProcSet (co-array '(PDF Text))
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'Font (make-co-dict 'F1 (co-io-ref 6 0))))
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;; contents
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(co-io 5 0
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(make-co-stream
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#"
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BT
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/F1 48 Tf
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(Hello) Tj
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(World) Tj
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ET
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"))
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;; font
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(co-io 6 0
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(make-co-dict
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'Type 'Font
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'Subtype 'Type1
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'Name 'F1
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'BaseFont 'FiraSansOTMedium
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'FontDescriptor (co-io-ref 9 0)
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'FirstChar 0
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'LastChar 1150
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'Widths (co-array (for/list ([i (in-range (add1 1150))])
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(define m (measure-char-idx "fira.otf" i))
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(displayln m)
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m))
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'Encoding 'MacRomanEncoding))
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(co-io 7 0
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(make-co-dict 'Type 'Annot
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'Subtype 'Link
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'Rect (co-array '(100 100 150 125))
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'A (co-io-ref 8 0)))
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(co-io 8 0
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(make-co-dict 'Type 'Action
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'S 'URI
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'URI (co-string "http://practicaltypography.com")))
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(co-io 9 0
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(make-co-dict
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'Type 'FontDescriptor
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'FontName 'FiraSansOTLight
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'FontFile3 (co-io-ref 10 0)
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'Flags 4
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'FontBBox (co-array '(-177 -269 1123 866))
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'MissingWidth 255
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'StemV 105
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'StemH 45
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'CapHeight 660
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'XHeight 394
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'Ascent 720
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'Descent -270
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'Leading 83
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'MaxWidth 1212
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'AvgWidth 478
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'ItalicAngle 0))
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(co-io 10 0 (make-font-co-stream "fira.otf"))
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