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if not modules then modules = { } end modules ['grph-bmp'] = {
version = 1.001,
comment = "companion to grph-inc.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local random = math.random
local context = context
local report_bitmap = logs.reporter("graphics","bitmap")
local bitmaps = { }
graphics.bitmaps = bitmaps
local wrapimage = images.wrap
function bitmaps.new(xsize,ysize,colorspace,colordepth,mask)
if not xsize or not ysize or xsize == 0 or ysize == 0 then
report_bitmap("provide 'xsize' and 'ysize' larger than zero")
return
end
if not colorspace then
report_bitmap("provide 'colorspace' (1, 2, 3, 'gray', 'rgb', 'cmyk'")
return
end
if not colordepth then
report_bitmap("provide 'colordepth' (1, 2)")
return
end
return graphics.identifiers.bitmap {
colorspace = colorspace,
colordepth = colordepth,
xsize = xsize,
ysize = ysize,
mask = mask and true or nil,
}
end
local function flush(bitmap)
return wrapimage(lpdf.injectors.bitmap(bitmap))
end
bitmaps.flush = flush
function bitmaps.tocontext(bitmap,width,height)
if type(width) == "number" then
width = width .. "sp"
end
if type(height) == "number" then
height = height .. "sp"
end
if width or height then
context.scale (
{
width = width,
height = height,
},
flush(bitmap)
)
else
context(flush(bitmap))
end
end
local function placeholder(nx,ny)
local nx = nx or 8
local ny = ny or nx
local bitmap = bitmaps.new(nx,ny,"gray",1)
local data = bitmap.data
for i=1,ny do
local d = data[i]
for j=1,nx do
d[j] = random(100,199)
end
end
return lpdf.injectors.bitmap(bitmap)
end
bitmaps.placeholder = placeholder
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