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| -rw-r--r-- | TODO | 121 |
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@@ -56,3 +56,124 @@ From which we can determine the maximum error: abs( max(e(t)) ) = 4/27 * (sin^6 (A/4)) / (cos^2 (A/4)) t in [0,1] +A comparison with PostScript +============================ +Here's a list of several classes of PostScript operators indicating +which operators have equivalents in Cairo and which do not. If the Cairo + +Oerators that are not yet in Cairo, but probably should be: arc, +arcto, strokepath, user path operators, rectclip?, clipsave/restore?, +setstrokeadjust?, currentdash, grestoreall?, initgraphics?, +currentgstate?, setgstate?, insideness testing?, showpage, copypage?, +erasepage?, setsmoothness? + +Painting operators +------------------ +in Cairo: stroke, fill, eofill (set_fill_rule/fill), image +(show_surface) + +not in Cairo: erasepage, rectstroke, rectfill, shfill, colorimage, +imagemask + +Path construction operators +--------------------------- +in Cairo: newpath, moveto, rmoveto (rel_move_to), lineto, rlineto +(rel_line_to), curveto, rcurveto (rel_curve_to), closepath, +currentpoint, charpath (text_path) + +not in Cairo: arc, arcn, arct, arcto, flattenpath, reversepath, +strokepath, clippath, pathbbox, pathforall + +User path operators +------------------- +not in Cairo: ustroke, ufill, ueofill, uappend, upath, ustrokepath, +setbbox, ucache + +Clipping +-------- +in Cairo: clip, eoclip (set_fill_rule/clip) + +not in Cairo: initclip, rectclip, clipsave, cliprestore + +Graphics state operators +------------------------ +in Cairo: setlinewidth, currentlinewidth, setlinecap, currentlinecap, +setlinejoin, currentlinejoin, setmiterlimit, currentmiterlimit, +setdash + +not in Cairo: setstrokeadjust, currentstrokeadjust, currentdash + +Color specification operators +----------------------------- +in Cairo: setrgbcolor, currentcolor + +not in Cairo: setcolor, setgray, currentgray, currentrgbcolor, +sethsbcolor, currenthsbcolor, setcmykcolor, currentcmykcolor, +setcolorspace, currentcolorspace + +Form and pattern operators +-------------------------- +in Cairo: setpattern, makepattern (lock_pattern) + +not in Cairo: execform + +Whole-state manipulation +------------------------ +in Cairo: gsave (save), grestore (restore) + +not in Cairo: grestoreall, initgraphics, gstate, currentgstate, +setgstate + +Coordinate system and matrix operators +-------------------------------------- +in Cairo: identmatrix (identity_matrix), initmatrix (default_matrix), +setmatrix, translate, scale, rotate, concatmatrix, currentmatrix, +transform (transform_point), dtransform (transform_distance) + +not in Cairo: matrix, defaultmatrix, concat, itransform, idtransform, +invertmatrix + +Insideness testing +------------------ +not in Cairo: infill, instroke, inufill, inustroke, ineofill, +inueofill + +Device setup +------------ +not in Cairo: showpage, copypage, setpagedevice, currentpagedevice, +nulldevice + +Glyph and font operators +------------------------ +in Cairo: currentfont, definefont (font_create_for_ft_face), +undefine_font (font_destroy), findfont (font_create), makefont +(transform_font), setfont, scalefont, selectfont, show (show_text), +stringwidth (x/y in text_extents), xyshow (glyph_show -- but ignoring +current_point and using absolute positions) + +not in Cairo, (and likely not needed): composefont, rootfont, ashow, +widthshow, awidthshow, xshow, xyshow, yshow, glyphshow, cshow, kshow, +FontDirectory, GlobalFontDirectory, StandardEncoding, +ISOLatin1Encoding, findencoding, setcachedevice, setcachedevice2, +setcharwidth + +Graphics state operators (device-dependent) +------------------------------------------- +in Cairo: setflat (set_tolerance), currentflat (current_tolerance) + +not in Cairo: sethalftone, currenthalftone, setscreen, currentscreen, +setcolorscreen, currentcolorscreen, settransfer, currenttransfer, +setcolortransfer, currentcolortransfer, setblackgeneration, +currentblackgeneration, setundercolorremoval, +currentundercolorremoval, setcolorrendering, currentcolorrendering, +setoverprint, currentoverprint, setsmoothness, currentsmoothness + +PostScript operators never to be in Cairo +----------------------------------------- +Operator Stack Manipulation Operators, Arithmetic and Math Operators, +Array Operators, Packed Array Operators, Dictionary Operators, String +Operators, Rational,Boolean,and Bitwise Operators, Control Operators, +Type,Attribute,and Conversion Operators, File Operators, Resource +Operators, Virtual Memory Operators, Miscellaneous Operators, +Interpreter Parameter Operators, Errors + |