Replaces deprecated method "opacity"

README.md

@@ -1,4 +1,4 @@
-Sprite Factory (v1.7.1)
+Sprite Factory (v1.7.3)
 =======================
 
 The sprite factory is a ruby library that can be used to generate

RELEASE_NOTES.md

@@ -1,3 +1,13 @@
+June 14th 2021 - v1.7.3
+---------------------------
+
+* removed deprecated method `has_rdoc` from gemspec. This method has no replacement and will be removed in Rubygems 4.
+
+February 26th 2021 - v1.7.2
+---------------------------
+
+* replaced deprecated method `opacity`, so that this gem can be used with rmagick >= 4.0.0.
+
 September 9th 2015 - v1.7.1
 ---------------------------
 

lib/sprite_factory.rb

@@ -2,7 +2,7 @@ module SpriteFactory
 
   #----------------------------------------------------------------------------
 
-  VERSION     = "1.7.1"
+  VERSION     = "1.7.3"
   SUMMARY     = "Automatic CSS sprite generator"
   DESCRIPTION = "Combines individual images from a directory into a single sprite image file and creates an appropriate CSS stylesheet"
   LIB         = File.dirname(__FILE__)

lib/sprite_factory/library/rmagick.rb

@@ -20,7 +20,7 @@ def self.load(files)
 
       def self.create(filename, images, width, height)
         target = Magick::Image.new(width,height)
-        target.opacity = Magick::QuantumRange
+        target.alpha(Magick::TransparentAlphaChannel)
         images.each do |image|
           target.composite!(image[:image], image[:x], image[:y], Magick::SrcOverCompositeOp)
         end

sprite_factory.gemspec

@@ -16,7 +16,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rmagick'
   s.add_development_dependency 'chunky_png'
 
-  s.has_rdoc         = false
   s.extra_rdoc_files = ["README.md"]
   s.rdoc_options     = ["--charset=UTF-8"]
   s.files            = `git ls-files `.split("\n")