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require 'tmpdir'
RSpec.describe Magick::Image, '#get_pixels' do
it 'works' do
image = described_class.new(20, 20)
pixels = image.get_pixels(0, 0, image.columns, 1)
expect(pixels).to be_instance_of(Array)
expect(pixels.length).to eq(image.columns)
expect(pixels.all?(Magick::Pixel)).to be(true)
expect { image.get_pixels(0, 0, -1, 1) }.to raise_error(RangeError)
expect { image.get_pixels(0, 0, image.columns, -1) }.to raise_error(RangeError)
expect { image.get_pixels(0, 0, image.columns + 1, 1) }.to raise_error(RangeError)
expect { image.get_pixels(0, 0, image.columns, image.rows + 1) }.to raise_error(RangeError)
end
it 'supports CMYK color' do
image = described_class.read(File.join(FIXTURE_PATH, 'cmyk.jpg')).first
pixel = image.get_pixels(0, 0, 1, 1).first
# convert cmyk.jpg -format '%[pixel:p{1,1}]' info:-
# => cmyk(49,181,1,183)
expect(pixel.cyan).to equal(49 * 257)
expect(pixel.magenta).to equal(181 * 257)
expect(pixel.yellow).to equal(1 * 257)
expect(pixel.black).to equal(183 * 257)
end
it 'get proper alpha value' do
image = described_class.new(1, 1)
pixel = Magick::Pixel.new
pixel.red = 12 * 257
pixel.green = 34 * 257
pixel.blue = 56 * 257
pixel.alpha = 78 * 257
image.alpha(Magick::SetAlphaChannel)
image.store_pixels(0, 0, 1, 1, [pixel])
temp_file_path = File.join(Dir.tmpdir, 'rmagick_get_pixels.png')
image.write(temp_file_path)
image2 = described_class.read(temp_file_path).first
pixel = image2.get_pixels(0, 0, 1, 1).first
expect(pixel.red).to equal(12 * 257)
expect(pixel.green).to equal(34 * 257)
expect(pixel.blue).to equal(56 * 257)
expect(pixel.alpha).to be_within(78 * 257).of(1)
end
end
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