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require "spec_helper"
RSpec.describe Vips::Source, version: [8, 9] do
it "can create a source from a descriptor" do
source = Vips::Source.new_from_descriptor(0)
expect(source)
end
it "can create a source from a filename" do
source = Vips::Source.new_from_file simg("wagon.jpg")
expect(source)
end
it "can't create a source from a bad filename" do
expect {
Vips::Source.new_from_file simg("banana.jpg")
}.to raise_exception(Vips::Error)
end
it "can create a source from an area of memory" do
str = File.open(simg("wagon.jpg"), "rb").read
source = Vips::Source.new_from_memory str
expect(source)
end
it "sources have filenames and nicks" do
source = Vips::Source.new_from_file simg("wagon.jpg")
expect(source.filename).to eq(simg("wagon.jpg"))
expect(source.nick)
end
it "can load an image from filename source" do
source = Vips::Source.new_from_file simg("wagon.jpg")
image = Vips::Image.new_from_source source, ""
expect(image)
expect(image.width).to eq(685)
expect(image.height).to eq(478)
expect(image.bands).to eq(3)
expect(image.avg).to be_within(0.001).of(109.789)
end
end
RSpec.describe Vips::Target, version: [8, 9] do
it "can create a target to a filename" do
target = Vips::Target.new_to_file timg("x.jpg")
expect(target)
end
it "can create a target to a descriptor" do
target = Vips::Target.new_to_descriptor 1
expect(target)
end
it "can create a target to a memory area" do
target = Vips::Target.new_to_memory
expect(target)
end
it "can't create a target to a bad filename" do
expect {
Vips::Target.new_to_file "/banana/monkey"
}.to raise_exception(Vips::Error)
end
it "can save an image to a filename target" do
source = Vips::Source.new_from_file simg("wagon.jpg")
image = Vips::Image.new_from_source source, ""
filename = timg("x4.png")
target = Vips::Target.new_to_file filename
image.write_to_target target, ".png"
image = Vips::Image.new_from_file filename
expect(image)
expect(image.width).to eq(685)
expect(image.height).to eq(478)
expect(image.bands).to eq(3)
expect(image.avg).to be_within(0.001).of(109.789)
end
it "can save an image to a memory target" do
source = Vips::Source.new_from_file simg("wagon.jpg")
image = Vips::Image.new_from_source source, ""
target = Vips::Target.new_to_memory
image.write_to_target target, ".png"
memory = target.get("blob")
image = Vips::Image.new_from_buffer memory, ""
expect(image)
expect(image.width).to eq(685)
expect(image.height).to eq(478)
expect(image.bands).to eq(3)
expect(image.avg).to be_within(0.001).of(109.789)
end
end
RSpec.describe Vips::SourceCustom, version: [8, 9] do
it "can create a custom source" do
source = Vips::SourceCustom.new
expect(source)
end
it "can load a custom source" do
file = File.open simg("wagon.jpg"), "rb"
source = Vips::SourceCustom.new
source.on_read { |length| file.read length }
source.on_seek { |offset, whence| file.seek(offset, whence) }
image = Vips::Image.new_from_source source, ""
expect(image)
expect(image.width).to eq(685)
expect(image.height).to eq(478)
expect(image.bands).to eq(3)
expect(image.avg).to be_within(0.001).of(109.789)
end
it "on_seek is optional" do
file = File.open simg("wagon.jpg"), "rb"
source = Vips::SourceCustom.new
source.on_read { |length| file.read length }
image = Vips::Image.new_from_source source, ""
expect(image)
expect(image.width).to eq(685)
expect(image.height).to eq(478)
expect(image.bands).to eq(3)
expect(image.avg).to be_within(0.001).of(109.789)
end
it "can create a user output stream" do
target = Vips::TargetCustom.new
expect(target)
end
it "can write an image to a user output stream" do
filename = timg("x5.png")
file = File.open filename, "wb"
target = Vips::TargetCustom.new
target.on_write { |chunk| file.write(chunk) }
target.on_finish { file.close }
image = Vips::Image.new_from_file simg("wagon.jpg")
image.write_to_target target, ".png"
image = Vips::Image.new_from_file filename
expect(image)
expect(image.width).to eq(685)
expect(image.height).to eq(478)
expect(image.bands).to eq(3)
expect(image.avg).to be_within(0.5).of(109.789)
end
end
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