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RSpec.describe Magick::Image, '#constitute' do
it 'returns an equivalent image to the given pixels' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGBA')
result = described_class.constitute(image.columns, image.rows, 'RGBA', pixels)
expect(result.export_pixels).to eq(image.export_pixels)
end
it 'allows constituting with RGBA quantum (integer) pixel values' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
# [R, G, B, A, R, G, B, A, ...]
pixels = [1] * 4 * image.columns * image.rows
result = described_class.constitute(image.columns, image.rows, 'RGBA', pixels)
result_pixels = result.dispatch(0, 0, image.columns, image.rows, 'RGBA')
expect(result_pixels).to all eq(1)
end
it 'allows constituting with RGBA scale (float) pixel values' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
# [R, G, B, A, R, G, B, A, ...]
pixels = [1.0] * 4 * image.columns * image.rows
result = described_class.constitute(image.columns, image.rows, 'RGBA', pixels)
result_pixels = result.dispatch(0, 0, image.columns, image.rows, 'RGBA')
expect(result_pixels).to all eq(65_535)
end
it 'raises an error when invalid RGBA pixel values are given' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = ['x'] * (4 * image.columns * image.rows)
expected_message = 'element 0 in pixel array is String, must be numeric'
expect { described_class.constitute(image.columns, image.rows, 'RGBA', pixels) }
.to raise_error(TypeError, expected_message)
end
it 'raises an error when 0 is passed for columns' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGBA')
expected_message = 'width and height must be greater than zero'
expect { described_class.constitute(0, image.rows, 'RGBA', pixels) }
.to raise_error(ArgumentError, expected_message)
end
it 'raises an error when a negative number is passed for columns' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGBA')
expected_message = 'width and height must be greater than zero'
expect { described_class.constitute(-3, image.rows, 'RGBA', pixels) }
.to raise_error(ArgumentError, expected_message)
end
it 'raises an error when 0 is passed for rows' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGBA')
expected_message = 'width and height must be greater than zero'
expect { described_class.constitute(image.columns, 0, 'RGBA', pixels) }
.to raise_error(ArgumentError, expected_message)
end
it 'raises an error when a negative number is passed for rows' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGBA')
expected_message = 'width and height must be greater than zero'
expect { described_class.constitute(image.columns, -3, 'RGBA', pixels) }
.to raise_error(ArgumentError, expected_message)
end
it 'raises an error given the wrong number of array elements' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
pixels = image.export_pixels(0, 0, image.columns, image.rows, 'RGBA')
expected_message = 'wrong number of array elements (60960 for 72)'
expect { described_class.constitute(3, 6, 'RGBA', pixels) }
.to raise_error(ArgumentError, expected_message)
end
end
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