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|
%D \module
%D [ file=meta-imp-bitmaps,
%D version=2021.08.03,
%D title=\METAPOST\ Graphics,
%D subtitle=Bitmap Manipulations,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\registerctxluafile{libs-imp-imagemagick}{autosuffix}
\registerctxluafile{libs-imp-graphicsmagick}{autosuffix}
% todo: load png directly
\startluacode
local char = string.char
local concat = table.concat
local unpack = unpack
graphics.bitmaps.magick = "imagemagick"
function graphics.bitmaps.load(name)
local inputname = name
local outputname = file.replacesuffix("m_k_i_v_mp_" .. name,"pnm")
if file.suffix(inputname) == "pnm" then
-- no need to convert
else
local whattodo = table.setmetatableindex( {
inputname = inputname,
outputname = outputname,
}, specification)
utilities[graphics.bitmaps.magick].convert(whattodo)
end
--
local files = utilities.files
local f = files.open(outputname)
local function read(f)
while true do
local s = files.readcline(f)
if not s then
return ""
elseif string.find(s,"^#") then
-- again
else
return s
end
end
end
local pnm = read(f)
local xy = string.split(read(f)," ")
local xsize = tonumber(xy[1])
local ysize = tonumber(xy[2])
local bsize = tonumber(read(f))
local bitmap, colorspace
if xsize and ysize and bsize then
local read = files.readbytetable
local data = { }
if pnm == "P6" then
colorspace = 2 -- rgb
for i=1,ysize do
local tt = { }
for i=1,xsize do
tt[i] = read(f,3)
end
data[i] = tt
end
elseif pnm == "P5" then
colorspace = 1 -- gray
for i=1,ysize do
data[i] = read(f,xsize)
end
elseif pnm == "P4" then
colorspace = 1
-- todo
end
bitmap = {
xsize = xsize,
ysize = ysize,
bsize = bsize,
inputname = inputname,
outputname = outputname,
colorspace = colorspace,
data = data,
}
end
files.close(f)
return bitmap
end
function graphics.bitmaps.save(b)
local xsize = b.xsize
local ysize = b.ysize
local bsize = b.bsize
local colorspace = b.colorspace
if xsize and ysize and bsize then
local data = b.data
local pnm = nil
if colorspace == 2 then
pnm = "P6"
for i=1,ysize do
local t = data[i]
for i=1,xsize do
t[i] = char(unpack(t[i]))
end
data[i] = concat(t)
end
elseif colorspace == 1 then
pnm = "P5"
if xsize > 1024 then
local t = data[i]
for i=1,xsize do
t[i] = char(t[i])
end
else
for i=1,ysize do
data[i] = char(unpack(data[i]))
end
end
else
return
end
local result = concat {
pnm .. "\r",
xsize .. " " ..
ysize .. "\r",
bsize .. "\r",
concat(data)
}
local outputname = file.replacesuffix(b.outputname,file.suffix(b.inputname))
local inputname = b.outputname
io.savedata(inputname,result)
--
local whattodo = table.setmetatableindex( {
inputname = inputname,
outputname = outputname,
}, specification)
utilities[graphics.bitmaps.magick].convert(whattodo)
b.finalname = outputname
end
end
graphics.bitmaps.manipulators = { }
function graphics.bitmaps.manipulators.invert(b)
local xsize = b.xsize
local ysize = b.ysize
local data = b.data
local colorspace = b.colorspace
if colorspace == 1 then
for r=1,ysize do
local row = data[r]
for c=1,xsize do
row[c] = 255 - row[c]
end
end
elseif colorspace == 2 then
for r=1,ysize do
local row = data[r]
for c=1,xsize do
local column = row[c]
column[1] = 255 - column[1]
column[2] = 255 - column[2]
column[4] = 255 - column[3]
end
end
end
end
\stopluacode
\continueifinputfile{meta-imp-bitmaps.mkxl}
\starttext
\startluacode
local random = math.random
function graphics.bitmaps.manipulators.myframe(b,f)
local xsize = b.xsize
local ysize = b.ysize
local data = b.data
local colorspace = b.colorspace
if colorspace == 1 then
local f = f or 20
local fx = xsize - f + 1
local fy = ysize - f + 1
for c=1,xsize do
for r=1,random(f-5,f+5) do
data[r][c] = random(0,255)
end
for r=ysize,random(fy-5,fy+5),-1 do
data[r][c] = random(0,255)
end
end
for r=1,ysize do
local row = data[r]
for c=1,random(f-5,f+5) do
row[c] = random(0,255)
end
for c=xsize,random(fx-5,fx+5),-1 do
row[c] = random(0,255)
end
end
elseif colorspace == 2 then
local f = f or 20
local fx = xsize - f + 1
local fy = ysize - f + 1
for c=1,xsize do
for r=1,random(f-5,f+5) do
local v = random(0,255)
data[r][c] = { v, v, v }
end
for r=ysize,random(fy-5,fy+5),-1 do
local v = random(0,255)
data[r][c] = { v, v, v }
end
end
for r=1,ysize do
local row = data[r]
for c=1,random(f-5,f+5) do
local v = random(0,255)
row[c] = { v, v, v }
end
for c=xsize,random(fx-5,fx+5),-1 do
local v = random(0,255)
row[c] = { v, v, v }
end
end
end
end
function graphics.bitmaps.manipulators.colorize(b,m)
local xsize = b.xsize
local ysize = b.ysize
local data = b.data
local colorspace = b.colorspace
if colorspace == 1 then
for r=1,ysize do
local row = data[r]
for c=1,xsize do
local v = row[c]
row[c] = m[v] or { v, v, v }
end
end
b.colorspace = 2
end
end
function graphics.bitmaps.manipulators.evening(b,m)
local xsize = b.xsize
local ysize = b.ysize
local data = b.data
local colorspace = b.colorspace
if colorspace == 1 then
for r=1,ysize do
local row = data[r]
for c=1,xsize do
row[c] = row[c] // 2
end
end
end
end
context.startTEXpage()
local b = graphics.bitmaps.load("hacker.jpg")
graphics.bitmaps.manipulators.myframe(b,20)
graphics.bitmaps.save(b)
context.externalfigure { b.finalname }
context.stopTEXpage()
context.startTEXpage()
local b = graphics.bitmaps.load("mill.png")
graphics.bitmaps.manipulators.invert(b)
graphics.bitmaps.manipulators.myframe(b,20)
graphics.bitmaps.tocontext(b,50*65536,nil)
context.stopTEXpage()
do
local m = table.setmetatableindex(function(t,k) local v = { k, k, k } t[k] = v return v end)
-- local c = { 255, 0, 0 } for i=0x00,0x1F do m[i] = c end
-- local c = { 0, 255, 0 } for i=0x20,0x3F do m[i] = c end
-- local c = { 0, 0, 255 } for i=0x40,0x5F do m[i] = c end
-- local c = { 255, 255, 0 } for i=0x60,0x7F do m[i] = c end
-- local c = { 255, 0, 255 } for i=0x80,0x9F do m[i] = c end
-- local c = { 0, 255, 255 } for i=0xA0,0xBF do m[i] = c end
-- local c = { 255, 255, 255 } for i=0xC0,0xDF do m[i] = c end
-- local c = { 0, 0, 0 } for i=0xE0,0xFF do m[i] = c end
local c = { 0, 0, 255 } for i=0x40,0x5F do m[i] = c end
local c = { 0, 255, 0 } for i=0x80,0x9F do m[i] = c end
local c = { 255, 0, 0 } for i=0xB0,0xCF do m[i] = c end
context.startTEXpage()
local b = graphics.bitmaps.load("mill.png")
graphics.bitmaps.manipulators.colorize(b,m)
graphics.bitmaps.tocontext(b,50*65536,nil)
context.stopTEXpage()
end
context.startTEXpage()
local b = graphics.bitmaps.load("mill.png")
graphics.bitmaps.manipulators.evening(b)
graphics.bitmaps.tocontext(b,50*65536,nil)
context.stopTEXpage()
\stopluacode
\protected\def\MyImage#1{\ctxlua{
local b = graphics.bitmaps.load("#1")
graphics.bitmaps.manipulators.invert(b)
graphics.bitmaps.manipulators.myframe(b,20)
graphics.bitmaps.tocontext(b,50*65536,nil)
}}
% This is inefficient because textext processes twice, so a "todo".
\startMPpage
picture p ; p := textext("\MyImage{mill.png}") ;
draw p ;
draw (boundingbox p) enlarged -.5mm
withpen pensquare scaled 1mm
withcolor "darkred"
withtransparency (1,.5)
;
\stopMPpage
\stoptext
|
