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# encoding: utf-8
require File.join(File.expand_path(File.dirname(__FILE__)), "spec_helper")
module BlendModeHelper
def make_blend_mode(blend_mode)
@pdf.blend_mode(blend_mode) do
yield if block_given?
end
end
end
describe "Document with with blend_mode" do
include BlendModeHelper
it "the PDF version should be at least 1.4" do
create_pdf
make_blend_mode(:Multiply)
str = @pdf.render
expect(str[0, 8]).to eq("%PDF-1.4")
end
it "a new extended graphics state should be created for " \
"each unique blend mode setting" do
create_pdf
make_blend_mode(:Multiply) do
make_blend_mode(:Screen)
end
extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
expect(extgstates.length).to eq(2)
end
it "a new extended graphics state should not be created for " \
"each duplicate blend mode setting" do
create_pdf
make_blend_mode(:Multiply) do
make_blend_mode(:Multiply)
end
extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
expect(extgstates.length).to eq(1)
end
it "setting the blend mode with only one parameter sets a single blend mode value" do
create_pdf
make_blend_mode(:Multiply)
extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates.first
expect(extgstate[:blend_mode]).to eq(:Multiply)
end
it "setting the blend mode with multiple parameters sets an array of blend modes" do
create_pdf
make_blend_mode([:Multiply, :Screen, :Overlay])
extgstate = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates.first
expect(extgstate[:blend_mode]).to eq([:Multiply, :Screen, :Overlay])
end
describe "with more than one page" do
include BlendModeHelper
it "the extended graphic state resource should be added to both pages" do
create_pdf
make_blend_mode(:Multiply)
@pdf.start_new_page
make_blend_mode(:Multiply)
extgstates = PDF::Inspector::ExtGState.analyze(@pdf.render).extgstates
extgstate = extgstates[0]
expect(extgstates.length).to eq(2)
expect(extgstate[:blend_mode]).to eq(:Multiply)
end
end
end
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