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Contents
require File.expand_path(File.dirname(__FILE__) + '/spec_helper')
NEW_IMG_WIDTH = 20
NEW_IMG_HEIGHT = 10
describe ZPNG::Image do
describe "new" do
let!(:img){ ZPNG::Image.new :width => NEW_IMG_WIDTH, :height => NEW_IMG_HEIGHT }
it "returns ZPNG::Image" do
img.should be_instance_of(ZPNG::Image)
end
it "creates new image of specified size" do
img.width.should == NEW_IMG_WIDTH
img.height.should == NEW_IMG_HEIGHT
end
describe "exported image" do
let!(:eimg){ img.export }
it "has PNG header" do
eimg.should start_with(ZPNG::Image::PNG_HDR)
end
describe "parsed again" do
let!(:img2){ ZPNG::Image.new(eimg) }
it "is a ZPNG::Image" do
img2.should be_instance_of(ZPNG::Image)
end
it "should be of specified size" do
img2.width.should == NEW_IMG_WIDTH
img2.height.should == NEW_IMG_HEIGHT
end
it "should have bpp = 32" do
img2.hdr.bpp.should == 32
end
it "should have 3 chunks: IHDR, IDAT, IEND" do
img2.chunks.map(&:type).should == %w'IHDR IDAT IEND'
end
it "should have all pixels transparent" do
NEW_IMG_HEIGHT.times do |y|
NEW_IMG_WIDTH.times do |x|
img2[x,y].should be_transparent
end
end
end
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems