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require "spec_helper"
RSpec.describe Vips::MutableImage do
it "can set! metadata in mutate" do
image = Vips::Image.black(16, 16)
image = image.mutate { |x|
x.set_type! GObject::GINT_TYPE, "banana", 12
}
expect(image.get("banana")).to eq(12)
end
it "can remove! metadata in mutate" do
image = Vips::Image.black(16, 16)
image = image.mutate { |x|
x.set_type! GObject::GINT_TYPE, "banana", 12
}
image = image.mutate { |x|
x.remove! "banana"
}
expect(image.get_typeof("banana")).to eq(0)
end
it "can call destructive operations in mutate" do
image = Vips::Image.black(16, 16)
image = image.mutate { |x|
x.draw_line! 255, 0, 0, x.width, x.height
}
expect(image.avg).to be > 0
end
it "cannot call non-destructive operations in mutate" do
image = Vips::Image.black(16, 16)
expect {
image = image.mutate { |x|
x.invert
}
}.to raise_exception(Vips::Error)
end
it "cannot use mutable images as arguments in mutate" do
image = Vips::Image.black(16, 16)
expect {
image = image.mutate { |x|
x.draw_image! x, 10, 10
}
}.to raise_exception(Vips::Error)
end
it "cannot call destructive operations outside mutate" do
image = Vips::Image.black(16, 16)
expect {
image.draw_line! 255, 0, 0, image.width, image.height
}.to raise_exception(Vips::Error)
end
end
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