diff options
Diffstat (limited to 'tex/context/base/mkxl/lpdf-grp.lmt')
| -rw-r--r-- | tex/context/base/mkxl/lpdf-grp.lmt | 201 |
1 files changed, 143 insertions, 58 deletions
diff --git a/tex/context/base/mkxl/lpdf-grp.lmt b/tex/context/base/mkxl/lpdf-grp.lmt index 7c4001467..48853ab83 100644 --- a/tex/context/base/mkxl/lpdf-grp.lmt +++ b/tex/context/base/mkxl/lpdf-grp.lmt @@ -106,70 +106,155 @@ end -- we could derive the colorspace if we strip the data -- and divide by x*y -local template = "q BI %s ID %s > EI Q" -local factor = 72/300 +-- todo: map onto png -function nodeinjections.injectbitmap(t) - -- encoding is ascii hex, no checking here - local xresolution, yresolution = t.xresolution or 0, t.yresolution or 0 - if xresolution == 0 or yresolution == 0 then - return -- fatal error - end - local colorspace = t.colorspace - if colorspace ~= "rgb" and colorspace ~= "cmyk" and colorspace ~= "gray" then - -- not that efficient but ok - local d = gsub(t.data,"[^0-9a-f]","") - local b = math.round(#d / (xresolution * yresolution)) - if b == 2 then - colorspace = "gray" - elseif b == 6 then - colorspace = "rgb" - elseif b == 8 then - colorspace = "cmyk" + +do + + local template = "q BI %s ID %s > EI Q" + local factor = 72/300 + + local methods = { } + + methods.hex = function(t) + -- encoding is ascii hex, no checking here + local xresolution, yresolution = t.xresolution or 0, t.yresolution or 0 + if xresolution == 0 or yresolution == 0 then + return -- fatal error + end + local colorspace = t.colorspace + if colorspace ~= "rgb" and colorspace ~= "cmyk" and colorspace ~= "gray" then + -- not that efficient but ok + local d = gsub(t.data,"[^0-9a-f]","") + local b = round(#d / (xresolution * yresolution)) + if b == 2 then + colorspace = "gray" + elseif b == 6 then + colorspace = "rgb" + elseif b == 8 then + colorspace = "cmyk" + end + end + colorspace = lpdf.colorspaceconstants[colorspace] + if not colorspace then + return -- fatal error end + --the original length L is required for pdf 2.0 (4096 max) + local d = pdfdictionary { + W = xresolution, + H = yresolution, + CS = colorspace, + BPC = 8, + F = pdfconstant("AHx"), + -- CS = nil, + -- BPC = 1, + -- IM = true, + } + -- for some reasons it only works well if we take a 1bp boundingbox + local urx, ury = 1/basepoints, 1/basepoints + -- urx = (xresolution/300)/basepoints + -- ury = (yresolution/300)/basepoints + local width, height = t.width or 0, t.height or 0 + if width == 0 and height == 0 then + width = factor * xresolution / basepoints + height = factor * yresolution / basepoints + elseif width == 0 then + width = height * xresolution / yresolution + elseif height == 0 then + height = width * yresolution / xresolution + end + local a = pdfdictionary { + BBox = pdfarray { 0, 0, round(urx * basepoints), round(ury * basepoints) } + } + local image = createimage { + stream = formatters[template](d(),t.data), + width = width, + height = height, + bbox = { 0, 0, round(urx), round(ury) }, + attr = a(), + nobbox = true, + } + return wrapimage(image) end - colorspace = lpdf.colorspaceconstants[colorspace] - if not colorspace then - return -- fatal error + + local zlibcompress = xzip.compress + local lpegmatch = lpeg.match + local compresslevel = 3 + local pattern = lpeg.Cs((lpeg.patterns.space/"" + lpeg.patterns.hextobyte)^0) + + methods.png = function(t) + -- encoding is ascii hex, no checking here + local xresolution = t.xresolution or 0 + local yresolution = t.yresolution or 0 + local data = t.data or "" + if xresolution == 0 or yresolution == 0 or data == "" then + return -- fatal error + end + local colorspace = t.colorspace + local colordepth = 8 + local colors = 1 + if colorspace ~= "rgb" and colorspace ~= "gray" then + -- not that efficient but ok + local d = gsub(t.data,"[^0-9a-f]","") + local b = round(#d / (xresolution * yresolution)) + if b == 2 then + colorspace = "gray" + colors = 1 + elseif b == 6 then + colorspace = "rgb" + colors = 3 + elseif b == 8 then + return -- for now, todo: convert + end + end + colorspace = lpdf.colorspaceconstants[colorspace] + if not colorspace then + return -- fatal error + end + local width = t.width + local height = t.height + if width == 0 and height == 0 then + width = factor * xresolution / basepoints + height = factor * yresolution / basepoints + elseif width == 0 then + width = height * xresolution / yresolution + elseif height == 0 then + height = width * yresolution / xresolution + end + data = zlibcompress(lpegmatch(pattern,data),compresslevel) + local xobject = pdfdictionary { + Type = pdfconstant("XObject"), + Subtype = pdfconstant("Image"), + Width = xresolution, + Height = yresolution, + BitsPerComponent = 8, + ColorSpace = colorspace, + Length = #data, + Filter = pdfconstant("FlateDecode"), + } + local image = createimage { +-- bbox = { 0, 0, round(width/xresolution), round(height/yresolution) }, -- mandate + bbox = { 0, 0, round(width), round(height) }, -- mandate + width = round(width), + height = round(height), + nolength = true, + nobbox = true, + notype = true, + stream = data, + attr = xobject(), + } + return wrapimage(image) end - local d = pdfdictionary { - W = xresolution, - H = yresolution, - CS = colorspace, - BPC = 8, - F = pdfconstant("AHx"), - -- CS = nil, - -- BPC = 1, - -- IM = true, - } - -- for some reasons it only works well if we take a 1bp boundingbox - local urx, ury = 1/basepoints, 1/basepoints - -- urx = (xresolution/300)/basepoints - -- ury = (yresolution/300)/basepoints - local width, height = t.width or 0, t.height or 0 - if width == 0 and height == 0 then - width = factor * xresolution / basepoints - height = factor * yresolution / basepoints - elseif width == 0 then - width = height * xresolution / yresolution - elseif height == 0 then - height = width * yresolution / xresolution + + function nodeinjections.injectbitmap(t) + if t.colorspace == "cmyk" then + return methods.hex(t) + else + return (methods[t.format or "hex"] or methods.hex)(t) + end end - local a = pdfdictionary { - BBox = pdfarray { 0, 0, urx * basepoints, ury * basepoints } - } - local image = createimage { - stream = formatters[template](d(),t.data), - width = width, - height = height, - bbox = { 0, 0, urx, ury }, - attr = a(), - nobbox = true, - } - return wrapimage(image) -end --- general graphic helpers +end function codeinjections.setfigurealternative(data,figure) local request = data.request |