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Contents
class PSD
class Renderer
# Adapted from
# http://www.hokstad.com/simple-drawing-in-ruby-with-cairo
module CairoHelpers
def cairo_image_surface(w, h, bg=nil)
surface = Cairo::ImageSurface.new(w, h)
cr = Cairo::Context.new(surface)
if bg
cr.set_source_rgba(*bg)
cr.paint
end
yield cr
surface.finish
data = cr.target.data.to_s[0, 4 * w * h]
# Cairo data is stored as BGRA, ugh.
data = data.unpack("N*").map do |color|
color = ChunkyPNG::Color.to_truecolor_alpha_bytes(color)
ChunkyPNG::Color.rgba(color[2], color[1], color[0], color[3])
end
ChunkyPNG::Canvas.new(w, h, data)
end
def cairo_path(cr, *pairs)
first = true
pairs.each do |cmd|
if cmd == :c
cr.close_path
first = true
elsif first
cr.move_to(*cmd)
first = false
else
cr.curve_to(*cmd)
end
end
end
end
end
end
Version data entries
18 entries across 18 versions & 1 rubygems