Change brand color and logotypes (#18592)

- Add rake task for generating Apple/Android icons and favicons from SVG
- Add rake task for generating PNG icons and logos for e-mails from SVG
- Remove obsolete Microsoft icons and configuration
- Remove PWA shortcut icons

lib/assets/wordmark.dark.css

@@ -0,0 +1 @@
+// Not needed

lib/assets/wordmark.light.css

@@ -0,0 +1 @@
+use { color: #000 !important; }

lib/tasks/branding.rake

@@ -0,0 +1,78 @@
+namespace :branding do
+  desc 'Generate necessary graphic assets for branding from source SVG files'
+  task generate: :environment do
+    Rake::Task['branding:generate_app_icons'].invoke
+    Rake::Task['branding:generate_app_badge'].invoke
+    Rake::Task['branding:generate_github_assets'].invoke
+    Rake::Task['branding:generate_mailer_assets'].invoke
+  end
+
+  desc 'Generate PNG icons and logos for e-mail templates'
+  task generate_mailer_assets: :environment do
+    rsvg_convert = Terrapin::CommandLine.new('rsvg-convert', '-w :w -h :h :input -o :output')
+    output_dest  = Rails.root.join('app', 'javascript', 'images', 'mailer')
+
+    # Displayed size is 64px, at 3x it's 192px
+    Dir[Rails.root.join('app', 'javascript', 'images', 'icons', '*.svg')].each do |path|
+      rsvg_convert.run(input: path, w: 192, h: 192, output: output_dest.join("#{File.basename(path, '.svg')}.png"))
+    end
+
+    # Displayed size is 34px, at 3x it's 102px
+    rsvg_convert.run(input: Rails.root.join('app', 'javascript', 'images', 'logo-symbol-wordmark.svg'), w: (102 * (261.0 / 66)).ceil, h: 102, output: output_dest.join('wordmark.png'))
+
+    # Displayed size is 24px, at 3x it's 72px
+    rsvg_convert.run(input: Rails.root.join('app', 'javascript', 'images', 'logo-symbol-icon.svg'), w: (72 * (79.0 / 75)).ceil, h: 72, output: output_dest.join('logo.png'))
+  end
+
+  desc 'Generate light/dark logotypes for GitHub'
+  task generate_github_assets: :environment do
+    rsvg_convert = Terrapin::CommandLine.new('rsvg-convert', '--stylesheet :stylesheet -w :w -h :h :input -o :output')
+    output_dest  = Rails.root.join('lib', 'assets')
+
+    rsvg_convert.run(stylesheet: Rails.root.join('lib', 'assets', 'wordmark.dark.css'), input: Rails.root.join('app', 'javascript', 'images', 'logo-symbol-wordmark.svg'), w: (102 * (261.0 / 66)).ceil, h: 102, output: output_dest.join('wordmark.dark.png'))
+    rsvg_convert.run(stylesheet: Rails.root.join('lib', 'assets', 'wordmark.light.css'), input: Rails.root.join('app', 'javascript', 'images', 'logo-symbol-wordmark.svg'), w: (102 * (261.0 / 66)).ceil, h: 102, output: output_dest.join('wordmark.light.png'))
+  end
+
+  desc 'Generate favicons and app icons from SVG source files'
+  task generate_app_icons: :environment do
+    favicon_source  = Rails.root.join('app', 'javascript', 'images', 'logo.svg')
+    app_icon_source = Rails.root.join('app', 'javascript', 'images', 'app-icon.svg')
+    output_dest     = Rails.root.join('app', 'javascript', 'icons')
+
+    rsvg_convert = Terrapin::CommandLine.new('rsvg-convert', '-w :size -h :size :input -o :output')
+    convert = Terrapin::CommandLine.new('convert', ':input :output')
+
+    favicon_sizes      = [16, 32, 48]
+    apple_icon_sizes   = [57, 60, 72, 76, 114, 120, 144, 152, 167, 180, 1024]
+    android_icon_sizes = [36, 48, 72, 96, 144, 192, 256, 384, 512]
+
+    favicons = []
+
+    favicon_sizes.each do |size|
+      output_path = output_dest.join("favicon-#{size}x#{size}.png")
+      favicons << output_path
+      rsvg_convert.run(size: size, input: favicon_source, output: output_path)
+    end
+
+    convert.run(input: favicons, output: Rails.root.join('public', 'favicon.ico'))
+
+    apple_icon_sizes.each do |size|
+      rsvg_convert.run(size: size, input: app_icon_source, output: output_dest.join("apple-touch-icon-#{size}x#{size}.png"))
+    end
+
+    android_icon_sizes.each do |size|
+      rsvg_convert.run(size: size, input: app_icon_source, output: output_dest.join("android-chrome-#{size}x#{size}.png"))
+    end
+  end
+
+  desc 'Generate badge icon from SVG source files'
+  task generate_app_badge: :environment do
+    rsvg_convert = Terrapin::CommandLine.new('rsvg-convert', '--stylesheet :stylesheet -w :w -h :h :input -o :output')
+    badge_source = Rails.root.join('app', 'javascript', 'images', 'logo-symbol-icon.svg')
+    source_ratio = 79.0 / 75
+    output_dest  = Rails.root.join('public')
+    stylesheet   = Rails.root.join('lib', 'assets', 'wordmark.light.css')
+
+    rsvg_convert.run(stylesheet: stylesheet, input: badge_source, w: (192 * source_ratio).ceil, h: 192, output: output_dest.join('badge.png'))
+  end
+end