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require 'spec_helper'
describe OilyPNG::PNGDecoding do
it "should call ChunkyPNG::Color.pixel_bytesize in the pure ruby version" do
ChunkyPNG::Color.should_receive(:pixel_bytesize).and_return(3)
ChunkyPNG::Canvas.from_file(resource_file('square.png'))
end
it "should not call ChunkyPNG::Color.pixel_bytesize in the native version" do
ChunkyPNG::Color.should_not_receive(:pixel_bytesize)
OilyPNG::Canvas.from_file(resource_file('square.png'))
end
context 'decoding different filtering methods' do
before(:all) { @reference = ChunkyPNG::Canvas.from_file(resource_file('nonsquare.png'))}
it "should decode NONE filtering exactly the same as ChunkyPNG" do
filtered_data = @reference.to_blob(:filtering => ChunkyPNG::FILTER_NONE)
ChunkyPNG::Canvas.from_blob(filtered_data).should == OilyPNG::Canvas.from_blob(filtered_data)
end
it "should decode SUB filtering exactly the same as ChunkyPNG" do
filtered_data = @reference.to_blob(:filtering => ChunkyPNG::FILTER_SUB)
ChunkyPNG::Canvas.from_blob(filtered_data).should == OilyPNG::Canvas.from_blob(filtered_data)
end
it "should decode UP filtering exactly the same as ChunkyPNG" do
filtered_data = @reference.to_blob(:filtering => ChunkyPNG::FILTER_UP)
ChunkyPNG::Canvas.from_blob(filtered_data).should == OilyPNG::Canvas.from_blob(filtered_data)
end
it "should decode AVERAGE filtering exactly the same as ChunkyPNG" do
filtered_data = @reference.to_blob(:filtering => ChunkyPNG::FILTER_AVERAGE)
ChunkyPNG::Canvas.from_blob(filtered_data).should == OilyPNG::Canvas.from_blob(filtered_data)
end
it "should decode PAETH filtering exactly the same as ChunkyPNG" do
filtered_data = @reference.to_blob(:filtering => ChunkyPNG::FILTER_PAETH)
ChunkyPNG::Canvas.from_blob(filtered_data).should == OilyPNG::Canvas.from_blob(filtered_data)
end
end
context 'decoding compatibility with ChunkyPNG' do
resource_files.each do |file|
it "should #{File.basename(file)} the same as ChunkyPNG" do
OilyPNG::Canvas.from_file(file).pixels.should == ChunkyPNG::Canvas.from_file(file).pixels
end
end
end
end
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