svg to temp bitmap

classes/InputFilter.rb

@@ -1,5 +1,10 @@
 require File.dirname(__FILE__) + '/Filter.rb'
 
 class InputFilter < Filter
-  OutputFilename = "tmp.png"
+  attr_accessor :output_filename
+
+  def initialize
+    super
+    @output_filename = "tmp.png"
+  end
 end

classes/SVGToTempBitmap.rb

@@ -14,7 +14,7 @@ class SVGToTempBitmap < InputFilter
   # process a single input file, possibly splitting it into two output files if it's a spread
   #
   def single(input)
-    filename = Dir.pwd + '/' + OutputFilename
+    filename = Dir.pwd + '/' + @output_filename
     inkscape(input, filename)
     @cleanup << filename
 
@@ -24,7 +24,7 @@ class SVGToTempBitmap < InputFilter
       return targets
     end
 
-    return filename
+    filename
   end
 
   def build_spread(filename)
@@ -46,7 +46,7 @@ class SVGToTempBitmap < InputFilter
       targets << target
     end
 
-    return targets
+    targets
   end
 
   #
@@ -58,32 +58,53 @@ class SVGToTempBitmap < InputFilter
     if @config['spread']; raise "Spreads and grids combined do not make sense"; end
 
     width, height = @config['grid'].split("x").collect { |f| f.to_f }
-    joined_files = []
 
     page_width, page_height = calculate_page_size
 
     grid_width = page_width / width
     grid_height = page_height / height
 
-    0.upto(files.length - 1) do |i|
-      x = i % width
-      y = (i / width).floor
-
-      if files[i].split('/').last != "blank"
-        tmp_svg_output = OutputFilename + "-#{i}.png"
-        inkscape(Dir.pwd + '/' + files[i], tmp_svg_output)
-
-        joined_files << [ tmp_svg_output, x, y ]
-        @cleanup << tmp_svg_output
-      end
-    end
+    joined_files = join_files(files, width)
 
     command = [
       "-size #{page_width}x#{page_height}",
       "xc:white"
     ]
 
-    joined_files.each do |file, x, y|
+    command.concat generate_joined_files_command(joined_files, grid_width, grid_height)
+
+    command << "\"#{@output_filename}\""
+
+    convert(command)
+
+    @cleanup.concat joined_files.collect { |file, x, y| file }
+    @cleanup << @output_filename
+
+    @output_filename
+  end
+
+  def join_files(files, width)
+    joined_files = []
+
+    files.each_index do |i|
+      x = i % width
+      y = (i / width).floor
+
+      if files[i].split('/').last != "blank"
+        tmp_file = @output_filename + "-#{i}.png"
+        inkscape(Dir.pwd + '/' + files[i], tmp_file)
+
+        joined_files << [ tmp_file, x, y ]
+      end
+    end
+
+    joined_files
+  end
+
+  def generate_joined_files_command(files, grid_width, grid_height)
+    command = []
+
+    files.each do |file, x, y|
       image_width, image_height = get_dimensions(file)
 
       x_offset = (grid_width - image_width) / 2
@@ -92,11 +113,6 @@ class SVGToTempBitmap < InputFilter
       command << "\"#{file}\" -geometry +#{x * grid_width + x_offset}+#{y * grid_height + y_offset} -composite"
     end
 
-    command << OutputFilename
-
-    convert(command)
-
-    @cleanup << OutputFilename
-    OutputFilename
+    command
   end
 end

tests/TestSVGToTempBitmap.rb

@@ -25,4 +25,98 @@ class TestSVGToTempBitmap < Test::Unit::TestCase
 
     assert_equal [ 'filename-left.png', 'filename-right.png' ], @filter.build_spread('filename')
   end
+
+  def test_join_files
+    @filter.output_filename = 'test'
+    [
+      [ [], 1, [] ],
+      [ ['file'], 1, [
+        [ 'test-0.png', 0, 0 ]
+      ] ],
+      [ ['file', 'file2'], 1, [
+        [ 'test-0.png', 0, 0 ],
+        [ 'test-1.png', 0, 1 ],
+      ] ],
+      [ ['file', 'file2'], 2, [
+        [ 'test-0.png', 0, 0 ],
+        [ 'test-1.png', 1, 0 ],
+      ] ],
+      [ ['blank', 'file2'], 2, [
+        [ 'test-1.png', 1, 0 ],
+      ] ],
+    ].each do |files, width, expected_output|
+      @filter.stubs(:inkscape)
+      assert_equal expected_output, @filter.join_files(files, width)
+    end
+  end
+
+  def test_generate_joined_files_command
+    [
+      [ [], 100, 50, [], [] ],
+      [
+        [
+          [ 'file', 0, 0 ]
+        ], 100, 50, [
+          [ 50, 25 ]
+        ], [
+          '"file" -geometry +25+12 -composite'
+        ]
+      ],
+    ].each do |files, grid_width, grid_height, image_size_returns, expected_command|
+      @filter.stubs(:get_dimensions).returns(*image_size_returns)
+
+      assert_equal expected_command, @filter.generate_joined_files_command(files, grid_width, grid_height)
+    end
+  end
+
+  def test_single_no_spread
+    @filter.output_filename = 'test'
+    @filter.expects(:inkscape).with('file', Dir.pwd + '/test')
+    assert_equal Dir.pwd + '/test', @filter.single('file')
+    assert_equal [ Dir.pwd + '/test' ], @filter.cleanup
+  end
+
+  def test_single_spread
+    @filter.stubs(:recalc_pixels)
+    @filter.output_filename = 'test'
+    @filter.config = {
+      'spread' => true
+    }
+
+    @filter.expects(:inkscape).with('file', Dir.pwd + '/test')
+    @filter.expects(:build_spread).with(Dir.pwd + '/test').returns(['target1', 'target2'])
+
+    @filter.single('file')
+  end
+
+  def test_multiple
+    @filter.stubs(:recalc_pixels)
+    @filter.output_filename = 'test'
+    @filter.config = {
+      'grid' => '2x1'
+    }
+    @filter.stubs(:calculate_page_size).returns([100,50])
+
+    joined_files = [
+      [ 'test-0.png', 0, 0 ],
+      [ 'test-1.png', 1, 0 ]
+    ]
+
+    @filter.expects(:join_files).with(['file1', 'file2'], 2).returns(joined_files)
+    @filter.expects(:generate_joined_files_command).with(joined_files, 50, 50).returns([
+      'command-1', 'command-2'
+    ])
+
+    @filter.expects(:convert).with([
+      '-size 100x50',
+      'xc:white',
+      'command-1',
+      'command-2',
+      '"test"'
+    ])
+
+    assert_equal 'test', @filter.multiple(['file1', 'file2'])
+    assert_equal [ 'test-0.png', 'test-1.png', 'test' ], @filter.cleanup
+  end
+
 end