1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
RSpec.describe Magick::Image, '#export_pixels' do
def fimport(image, pixels, type)
image = Magick::Image.new(image.columns, image.rows)
image.import_pixels(0, 0, image.columns, image.rows, 'RGB', pixels, type)
_, diff = image.compare_channel(image, Magick::MeanAbsoluteErrorMetric)
expect(diff).to be_within(50.0).of(0.0)
end
it 'works' do
image = described_class.new(20, 20)
result = image.export_pixels
expect(result).to be_instance_of(Array)
expect(result.length).to eq(image.columns * image.rows * 'RGB'.length)
expect(result).to all(be_kind_of(Integer))
expect { image.export_pixels(0) }.not_to raise_error
expect { image.export_pixels(0, 0) }.not_to raise_error
expect { image.export_pixels(0, 0, 10) }.not_to raise_error
expect { image.export_pixels(0, 0, 10, 10) }.not_to raise_error
result = image.export_pixels(0, 0, 10, 10, 'RGBA')
expect(result.length).to eq(10 * 10 * 'RGBA'.length)
result = image.export_pixels(0, 0, 10, 10, 'I')
expect(result.length).to eq(10 * 10 * 'I'.length)
# too many arguments
expect { image.export_pixels(0, 0, 10, 10, 'I', 2) }.to raise_error(ArgumentError)
end
it 'works with float types' do
image = described_class.read(File.join(IMAGES_DIR, 'Flower_Hat.jpg')).first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGB')
fpixels = pixels.map { |pixel| pixel.to_f / Magick::QuantumRange }
packed_pixels = fpixels.pack('F*')
fimport(image, packed_pixels, Magick::FloatPixel)
packed_pixels = fpixels.pack('D*')
fimport(image, packed_pixels, Magick::DoublePixel)
end
end
|
