Initial apple generator.

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# gem "rails"
+
+gem 'rmagick', '~>4'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    rmagick (4.2.4)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  rmagick (~> 4)
+
+BUNDLED WITH
+   2.3.3

apple_ssd1327.rb

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+require 'bundler'
+
+Bundler::require
+
+require 'rmagick'
+include Magick
+
+IMAGE_DIR='video/128_128'
+OUTPUT_NAME='video/128_128/apple.bin'
+
+COLOR_STEP=(Magick::QuantumRange + 1) / 16
+
+def convert_image(filename)
+    im = Image.read(filename)
+    pix_ary = Array.new(8192, 0)
+    im[0].each_pixel do |pix, col, row|
+        if col.even? then # Low nibble
+                pix_ary[row * 64 + col / 2] &= 0xF0
+                pix_ary[row * 64 + col / 2] |= pix.intensity / COLOR_STEP
+        else # High nibble
+            pix_ary[row * 64 + col / 2] &= 0x0F
+            pix_ary[row * 64 + col / 2] |= (pix.intensity / COLOR_STEP) << 4
+        end
+    end
+    pix_ary
+end
+
+File.open(OUTPUT_NAME, "w+") do |f|
+    Dir.glob("#{IMAGE_DIR}/*.bmp").each_with_index do |img, i|
+        puts "#{i} image processed."
+        f.write(convert_image(img).pack("C*"))
+    end
+end
+

apple_st75256.rb

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+require 'bundler'
+
+Bundler::require
+
+require 'rmagick'
+include Magick
+
+IMAGE_DIR='video/256_128'
+OUTPUT_NAME='video/256_128/apple_st75256.bin'
+
+COLOR_STEP=(Magick::QuantumRange + 1) / 4
+
+def convert_image(filename)
+    im = Image.read(filename)
+    pix_ary = Array.new(8192, 0)
+    im[0].each_pixel do |pix, col, row|
+        color = pix.intensity / COLOR_STEP
+
+        byte_offset = 256 * (row / 4) + col
+        bit_offset = (3 - (row % 4)) * 2
+
+        pix_ary[byte_offset] &= ~(3 << bit_offset)
+        pix_ary[byte_offset] |= (color << bit_offset)
+    end
+    pix_ary
+end
+
+File.open(OUTPUT_NAME, "w+") do |f|
+    Dir.glob("#{IMAGE_DIR}/*.bmp").each_with_index do |img, i|
+        puts "#{i} image processed."
+        f.write(convert_image(img).pack("C*"))
+    end
+end
+