It's a dev package

fixing a deps issue.
Updating based on changes to filedrop element.
2018-11-06 13:50:50 +00:00 · 2018-11-06 13:50:49 +00:00 · 2018-11-06 13:50:49 +00:00 · 2018-11-06 13:50:48 +00:00 · 2018-11-06 13:47:18 +00:00 · 2018-11-06 13:47:18 +00:00
38 changed files with 1053 additions and 831 deletions
--- a/codecs/mozjpeg_enc/README.md
+++ b/codecs/mozjpeg_enc/README.md
@@ -39,5 +39,9 @@ struct MozJpegOptions {
  bool trellis_opt_zero;
  bool trellis_opt_table;
  int trellis_loops;
+  bool auto_subsample;
+  int chroma_subsample;
+  bool separate_chroma_quality;
+  int chroma_quality;
 };
 ```
--- a/codecs/mozjpeg_enc/example.html
+++ b/codecs/mozjpeg_enc/example.html
@@ -21,7 +21,7 @@
    console.log('Version:', module.version().toString(16));
    const image = await loadImage('../example.png');
    const result = module.encode(image.data, image.width, image.height, {
-      quality: 40,
+      quality: 75,
      baseline: false,
      arithmetic: false,
      progressive: true,
@@ -29,10 +29,14 @@
      smoothing: 0,
      color_space: 3,
      quant_table: 3,
-      trellis_multipass: true,
-      trellis_opt_zero: true,
-      trellis_opt_table: true,
+      trellis_multipass: false,
+      trellis_opt_zero: false,
+      trellis_opt_table: false,
      trellis_loops: 1,
+      auto_subsample: true,
+      chroma_subsample: 2,
+      separate_chroma_quality: false,
+      chroma_quality: 75,
    });

    const blob = new Blob([result], {type: 'image/jpeg'});
--- a/codecs/mozjpeg_enc/mozjpeg_enc.cpp
+++ b/codecs/mozjpeg_enc/mozjpeg_enc.cpp
@@ -29,6 +29,10 @@ struct MozJpegOptions {
  bool trellis_opt_zero;
  bool trellis_opt_table;
  int trellis_loops;
+  bool auto_subsample;
+  int chroma_subsample;
+  bool separate_chroma_quality;
+  int chroma_quality;
 };

 int version() {
@@ -119,9 +123,6 @@ val encode(std::string image_in, int image_width, int image_height, MozJpegOptio
   */
  jpeg_set_defaults(&cinfo);

-  /* Now you can set any non-default parameters you wish to.
-   * Here we just illustrate the use of quality (quantization table) scaling:
-   */
  jpeg_set_colorspace(&cinfo, (J_COLOR_SPACE) opts.color_space);

  if (opts.quant_table != -1) {
@@ -142,11 +143,23 @@ val encode(std::string image_in, int image_width, int image_height, MozJpegOptio
  jpeg_c_set_bool_param(&cinfo, JBOOLEAN_TRELLIS_Q_OPT, opts.trellis_opt_table);
  jpeg_c_set_int_param(&cinfo, JINT_TRELLIS_NUM_LOOPS, opts.trellis_loops);

+  // A little hacky to build a string for this, but it means we can use set_quality_ratings which
+  // does some useful heuristic stuff.
  std::string quality_str = std::to_string(opts.quality);
+
+  if (opts.separate_chroma_quality && opts.color_space == JCS_YCbCr) {
+    quality_str += "," + std::to_string(opts.chroma_quality);
+  }
+
  char const *pqual = quality_str.c_str();

  set_quality_ratings(&cinfo, (char*) pqual, opts.baseline);

+  if (!opts.auto_subsample && opts.color_space == JCS_YCbCr) {
+    cinfo.comp_info[0].h_samp_factor = opts.chroma_subsample;
+    cinfo.comp_info[0].v_samp_factor = opts.chroma_subsample;
+  }
+
  if (!opts.baseline && opts.progressive) {
    jpeg_simple_progression(&cinfo);
  } else {
@@ -209,6 +222,10 @@ EMSCRIPTEN_BINDINGS(my_module) {
    .field("trellis_opt_zero", &MozJpegOptions::trellis_opt_zero)
    .field("trellis_opt_table", &MozJpegOptions::trellis_opt_table)
    .field("trellis_loops", &MozJpegOptions::trellis_loops)
+    .field("chroma_subsample", &MozJpegOptions::chroma_subsample)
+    .field("auto_subsample", &MozJpegOptions::auto_subsample)
+    .field("separate_chroma_quality", &MozJpegOptions::separate_chroma_quality)
+    .field("chroma_quality", &MozJpegOptions::chroma_quality)
    ;

  function("version", &version);
--- a/codecs/mozjpeg_enc/mozjpeg_enc.js
+++ b/codecs/mozjpeg_enc/mozjpeg_enc.js
--- a/codecs/mozjpeg_enc/mozjpeg_enc.wasm
+++ b/codecs/mozjpeg_enc/mozjpeg_enc.wasm
--- a/package-lock.json
+++ b/package-lock.json
@@ -59,9 +59,9 @@
      "dev": true
    },
    "@types/node": {
-      "version": "9.6.31",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-9.6.31.tgz",
-      "integrity": "sha512-kIVlvUBizL51ALNMPbmcZoM7quHyB7J6fLRwQe22JsMp39nrVSHdBeVVS3fnQCK1orxI3O8LScmb8cuiihkAfA==",
+      "version": "9.6.35",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-9.6.35.tgz",
+      "integrity": "sha512-h5zvHS8wXHGa+Gcqs9K8vqCgOtqjr0+NqG/DDJmQIX1wpR9HivAfgV8bjcD3mGM4bPfQw5Aneb2Pn8355L83jA==",
      "dev": true
    },
    "@types/pretty-bytes": {
@@ -254,9 +254,9 @@
      }
    },
    "@webcomponents/custom-elements": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/@webcomponents/custom-elements/-/custom-elements-1.2.0.tgz",
-      "integrity": "sha512-KegC4y9/xlZNlEcKNtMmKXxNNMMLROzVntX55NfSgMhaXjwNf8EG8ypA2lt20ZQ/LoL0QuGxMZnf3kO5DdQjEQ==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@webcomponents/custom-elements/-/custom-elements-1.2.1.tgz",
+      "integrity": "sha512-flmTp4rVbBkcUIF3eBO3LNoAaYvleTdhPZKzdzr6iztWLLrxCctcK+7MAQeC3/SPjc3JDdC3jYLMRF4R6C3f9g==",
      "dev": true
    },
    "@xtuc/ieee754": {
@@ -339,9 +339,9 @@
      "dev": true
    },
    "ansi-colors": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.0.5.tgz",
-      "integrity": "sha512-VVjWpkfaphxUBFarydrQ3n26zX5nIK7hcbT3/ielrvwDDyBBjuh2vuSw1P9zkPq0cfqvdw7lkYHnu+OLSfIBsg==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.1.0.tgz",
+      "integrity": "sha512-hTv1qPdi+sVEk3jYsdjox5nQI0C9HTbjKShbCdYLKb1LOfNbb7wsF4d7OEKIZoxIHx02tSp3m94jcPW2EfMjmA==",
      "dev": true
    },
    "ansi-escapes": {
@@ -904,67 +904,67 @@
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      "version": "6.13.0",
-      "resolved": "http://registry.npmjs.org/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz",
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-      "resolved": "http://registry.npmjs.org/babel-plugin-syntax-async-generators/-/babel-plugin-syntax-async-generators-6.13.0.tgz",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-async-generators/-/babel-plugin-syntax-async-generators-6.13.0.tgz",
      "integrity": "sha1-a8lj67FuzLrmuStZbrfzXDQqi5o=",
      "dev": true
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    "babel-plugin-syntax-class-constructor-call": {
      "version": "6.18.0",
-      "resolved": "http://registry.npmjs.org/babel-plugin-syntax-class-constructor-call/-/babel-plugin-syntax-class-constructor-call-6.18.0.tgz",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-class-constructor-call/-/babel-plugin-syntax-class-constructor-call-6.18.0.tgz",
      "integrity": "sha1-nLnTn+Q8hgC+yBRkVt3L1OGnZBY=",
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    "babel-plugin-syntax-class-properties": {
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-      "resolved": "http://registry.npmjs.org/babel-plugin-syntax-class-properties/-/babel-plugin-syntax-class-properties-6.13.0.tgz",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-class-properties/-/babel-plugin-syntax-class-properties-6.13.0.tgz",
      "integrity": "sha1-1+sjt5oxf4VDlixQW4J8fWysJ94=",
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    "babel-plugin-syntax-decorators": {
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-      "resolved": "http://registry.npmjs.org/babel-plugin-syntax-jsx/-/babel-plugin-syntax-jsx-6.18.0.tgz",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-jsx/-/babel-plugin-syntax-jsx-6.18.0.tgz",
      "integrity": "sha1-CvMqmm4Tyno/1QaeYtew9Y0NiUY=",
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@@ -1339,9 +1339,9 @@
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+      "version": "0.4.19",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-react-remove-prop-types/-/babel-plugin-transform-react-remove-prop-types-0.4.19.tgz",
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@@ -1639,7 +1639,6 @@
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@@ -1795,7 +1794,7 @@
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-      "resolved": "http://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
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@@ -1832,7 +1831,7 @@
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-      "resolved": "http://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
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@@ -1876,7 +1875,7 @@
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-      "resolved": "http://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz",
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@@ -2604,9 +2603,9 @@
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@@ -2672,7 +2671,7 @@
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@@ -2685,7 +2684,7 @@
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@@ -3139,7 +3138,7 @@
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@@ -3209,7 +3208,7 @@
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@@ -3275,7 +3274,7 @@
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@@ -3896,6 +3894,12 @@
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@@ -4829,13 +4833,13 @@
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-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.1.0.tgz",
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-      "integrity": "sha1-xvxhZIo9nE52T9P8306hBeSSupg=",
+      "version": "1.15.1",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.15.1.tgz",
+      "integrity": "sha512-mSdgNUaidk+dRU5MhYtN9zebdzF2iG0cNPWy8HG+W8y+fT1JnSkh0fzzpjOa0L7P8i1Rscz38t0h4gPcKz43xA==",
      "dev": true,
      "requires": {
        "asn1": "~0.2.3",
@@ -10330,7 +10341,7 @@
      "dependencies": {
        "rimraf": {
          "version": "2.2.8",
-          "resolved": "http://registry.npmjs.org/rimraf/-/rimraf-2.2.8.tgz",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.2.8.tgz",
          "integrity": "sha1-5Dm+Kq7jJzIZUnMPmaiSnk/FBYI=",
          "dev": true
        }
@@ -10350,7 +10361,7 @@
    },
    "through": {
      "version": "2.3.8",
-      "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
      "dev": true
    },
@@ -10455,11 +10466,12 @@
      "dev": true
    },
    "tough-cookie": {
-      "version": "2.3.4",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
-      "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
      "dev": true,
      "requires": {
+        "psl": "^1.1.24",
        "punycode": "^1.4.1"
      },
      "dependencies": {
@@ -10756,8 +10768,7 @@
      "version": "0.14.5",
      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true,
-      "optional": true
+      "dev": true
    },
    "type-is": {
      "version": "1.6.16",
@@ -10924,18 +10935,18 @@
      "dev": true
    },
    "unique-filename": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.0.tgz",
-      "integrity": "sha1-0F8v5AMlYIcfMOk8vnNe6iAVFPM=",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.1.tgz",
+      "integrity": "sha512-Vmp0jIp2ln35UTXuryvjzkjGdRyf9b2lTXuSYUiPmzRcl3FDtYqAwOnTJkAngD9SWhnoJzDbTKwaOrZ+STtxNQ==",
      "dev": true,
      "requires": {
        "unique-slug": "^2.0.0"
      }
    },
    "unique-slug": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-2.0.0.tgz",
-      "integrity": "sha1-22Z258fMBimHj/GWCXx4hVrp9Ks=",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-2.0.1.tgz",
+      "integrity": "sha512-n9cU6+gITaVu7VGj1Z8feKMmfAjEAQGhwD9fE3zvpRRa0wEIx8ODYkVGfSc94M2OX00tUFV8wH3zYbm1I8mxFg==",
      "dev": true,
      "requires": {
        "imurmurhash": "^0.1.4"
@@ -11038,12 +11049,6 @@
        }
      }
    },
-    "url-join": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/url-join/-/url-join-4.0.0.tgz",
-      "integrity": "sha1-TTNA6AfTdzvamZH4MFrNzCpmXSo=",
-      "dev": true
-    },
    "url-parse": {
      "version": "1.4.3",
      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.4.3.tgz",
@@ -11689,17 +11694,14 @@
      }
    },
    "webpack-dev-middleware": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/webpack-dev-middleware/-/webpack-dev-middleware-3.2.0.tgz",
-      "integrity": "sha512-YJLMF/96TpKXaEQwaLEo+Z4NDK8aV133ROF6xp9pe3gQoS7sxfpXh4Rv9eC+8vCvWfmDjRQaMSlRPbO+9G6jgA==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/webpack-dev-middleware/-/webpack-dev-middleware-3.4.0.tgz",
+      "integrity": "sha512-Q9Iyc0X9dP9bAsYskAVJ/hmIZZQwf/3Sy4xCAZgL5cUkjZmUZLt4l5HpbST/Pdgjn3u6pE7u5OdGd1apgzRujA==",
      "dev": true,
      "requires": {
-        "loud-rejection": "^1.6.0",
        "memory-fs": "~0.4.1",
        "mime": "^2.3.1",
-        "path-is-absolute": "^1.0.0",
        "range-parser": "^1.0.3",
-        "url-join": "^4.0.0",
        "webpack-log": "^2.0.0"
      },
      "dependencies": {
@@ -11712,9 +11714,9 @@
      }
    },
    "webpack-dev-server": {
-      "version": "3.1.8",
-      "resolved": "https://registry.npmjs.org/webpack-dev-server/-/webpack-dev-server-3.1.8.tgz",
-      "integrity": "sha512-c+tcJtDqnPdxCAzEEZKdIPmg3i5i7cAHe+B+0xFNK0BlCc2HF/unYccbU7xTgfGc5xxhCztCQzFmsqim+KhI+A==",
+      "version": "3.1.9",
+      "resolved": "https://registry.npmjs.org/webpack-dev-server/-/webpack-dev-server-3.1.9.tgz",
+      "integrity": "sha512-fqPkuNalLuc/hRC2QMkVYJkgNmRvxZQo7ykA2e1XRg/tMJm3qY7ZaD6d89/Fqjxtj9bOrn5wZzLD2n84lJdvWg==",
      "dev": true,
      "requires": {
        "ansi-html": "0.0.7",
@@ -11742,7 +11744,7 @@
        "spdy": "^3.4.1",
        "strip-ansi": "^3.0.0",
        "supports-color": "^5.1.0",
-        "webpack-dev-middleware": "3.2.0",
+        "webpack-dev-middleware": "3.4.0",
        "webpack-log": "^2.0.0",
        "yargs": "12.0.2"
      },
@@ -11795,9 +11797,9 @@
          }
        },
        "debug": {
-          "version": "3.2.5",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.5.tgz",
-          "integrity": "sha512-D61LaDQPQkxJ5AUM2mbSJRbPkNs/TmdmOeLAi1hgDkpDfIfetSrjmWhccwtuResSwMbACjx/xXQofvM9CE/aeg==",
+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
          "dev": true,
          "requires": {
            "ms": "^2.1.1"
@@ -12122,7 +12124,7 @@
    },
    "wrap-ansi": {
      "version": "2.1.0",
-      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
      "dev": true,
      "requires": {
@@ -12518,7 +12520,7 @@
        },
        "minimist": {
          "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
          "dev": true
        },
--- a/package.json
+++ b/package.json
@@ -15,10 +15,10 @@
    }
  },
  "devDependencies": {
-    "@types/node": "^9.6.23",
+    "@types/node": "^9.6.35",
    "@types/pretty-bytes": "^5.1.0",
    "@types/webassembly-js-api": "0.0.1",
-    "@webcomponents/custom-elements": "^1.2.0",
+    "@webcomponents/custom-elements": "^1.2.1",
    "babel-loader": "^7.1.5",
    "babel-plugin-jsx-pragmatic": "^1.0.2",
    "babel-plugin-syntax-dynamic-import": "^6.18.0",
@@ -27,20 +27,20 @@
    "babel-plugin-transform-object-rest-spread": "^6.26.0",
    "babel-plugin-transform-react-constant-elements": "^6.23.0",
    "babel-plugin-transform-react-jsx": "^6.24.1",
-    "babel-plugin-transform-react-remove-prop-types": "^0.4.14",
+    "babel-plugin-transform-react-remove-prop-types": "^0.4.19",
    "babel-preset-env": "^1.7.0",
    "babel-register": "^6.26.0",
    "clean-webpack-plugin": "^0.1.19",
-    "copy-webpack-plugin": "^4.5.2",
+    "copy-webpack-plugin": "^4.5.3",
    "css-loader": "^0.28.11",
    "exports-loader": "^0.7.0",
    "file-loader": "^1.1.11",
    "html-webpack-plugin": "^3.2.0",
-    "husky": "^1.0.0-rc.13",
+    "husky": "^1.1.2",
    "if-env": "^1.0.4",
    "loader-utils": "^1.1.0",
    "mini-css-extract-plugin": "^0.3.0",
-    "node-sass": "^4.9.3",
+    "node-sass": "^4.9.4",
    "optimize-css-assets-webpack-plugin": "^4.0.3",
    "progress-bar-webpack-plugin": "^1.11.0",
    "raw-loader": "^0.5.1",
@@ -55,7 +55,7 @@
    "tslint-react": "^3.6.0",
    "typescript": "^2.9.2",
    "typings-for-css-modules-loader": "^1.7.0",
-    "webpack": "^4.19.1",
+    "webpack": "=4.19.1",
    "webpack-bundle-analyzer": "^2.13.1",
    "webpack-cli": "^2.1.5",
    "webpack-dev-server": "^3.1.5",
@@ -65,6 +65,7 @@
    "linkstate": "^1.1.1",
    "preact": "^8.3.1",
    "pretty-bytes": "^5.1.0",
-    "worker-plugin": "^1.1.1"
+    "worker-plugin": "^1.1.1",
+    "file-drop-element": "0.0.7"
  }
 }
--- a/src/codecs/mozjpeg/encoder-meta.ts
+++ b/src/codecs/mozjpeg/encoder-meta.ts
@@ -17,6 +17,10 @@ export interface EncodeOptions {
  trellis_opt_zero: boolean;
  trellis_opt_table: boolean;
  trellis_loops: number;
+  auto_subsample: boolean;
+  chroma_subsample: number;
+  separate_chroma_quality: boolean;
+  chroma_quality: number;
 }

 export interface EncoderState { type: typeof type; options: EncodeOptions; }
@@ -38,4 +42,8 @@ export const defaultOptions: EncodeOptions = {
  trellis_opt_zero: false,
  trellis_opt_table: false,
  trellis_loops: 1,
+  auto_subsample: true,
+  chroma_subsample: 2,
+  separate_chroma_quality: false,
+  chroma_quality: 75,
 };
--- a/src/codecs/mozjpeg/options.tsx
+++ b/src/codecs/mozjpeg/options.tsx
@@ -39,8 +39,13 @@ export default class MozJPEGEncoderOptions extends Component<Props, State> {
      trellis_multipass: inputFieldChecked(form.trellis_multipass, options.trellis_multipass),
      trellis_opt_zero: inputFieldChecked(form.trellis_opt_zero, options.trellis_opt_zero),
      trellis_opt_table: inputFieldChecked(form.trellis_opt_table, options.trellis_opt_table),
+      auto_subsample: inputFieldChecked(form.auto_subsample, options.auto_subsample),
+      separate_chroma_quality:
+        inputFieldChecked(form.separate_chroma_quality, options.separate_chroma_quality),
      // .value
      quality: inputFieldValueAsNumber(form.quality, options.quality),
+      chroma_quality: inputFieldValueAsNumber(form.chroma_quality, options.chroma_quality),
+      chroma_subsample: inputFieldValueAsNumber(form.chroma_subsample, options.chroma_subsample),
      smoothing: inputFieldValueAsNumber(form.smoothing, options.smoothing),
      color_space: inputFieldValueAsNumber(form.color_space, options.color_space),
      quant_table: inputFieldValueAsNumber(form.quant_table, options.quant_table),
@@ -75,6 +80,72 @@ export default class MozJPEGEncoderOptions extends Component<Props, State> {
        <Expander>
          {showAdvanced ?
            <div>
+              <label class={style.optionTextFirst}>
+                Channels:
+                <Select
+                  name="color_space"
+                  value={options.color_space}
+                  onChange={this.onChange}
+                >
+                  <option value={MozJpegColorSpace.GRAYSCALE}>Grayscale</option>
+                  <option value={MozJpegColorSpace.RGB}>RGB</option>
+                  <option value={MozJpegColorSpace.YCbCr}>YCbCr</option>
+                </Select>
+              </label>
+              <Expander>
+                {options.color_space === MozJpegColorSpace.YCbCr ?
+                  <div>
+                    <label class={style.optionInputFirst}>
+                      <Checkbox
+                        name="auto_subsample"
+                        checked={options.auto_subsample}
+                        onChange={this.onChange}
+                      />
+                      Auto subsample chroma
+                    </label>
+                    <Expander>
+                      {options.auto_subsample ? null :
+                        <div class={style.optionOneCell}>
+                          <Range
+                            name="chroma_subsample"
+                            min="1"
+                            max="4"
+                            value={options.chroma_subsample}
+                            onInput={this.onChange}
+                          >
+                            Subsample chroma by:
+                          </Range>
+                        </div>
+                      }
+                    </Expander>
+                    <label class={style.optionInputFirst}>
+                      <Checkbox
+                        name="separate_chroma_quality"
+                        checked={options.separate_chroma_quality}
+                        onChange={this.onChange}
+                      />
+                      Separate chroma quality
+                    </label>
+                    <Expander>
+                      {options.separate_chroma_quality ?
+                        <div class={style.optionOneCell}>
+                          <Range
+                            name="chroma_quality"
+                            min="0"
+                            max="100"
+                            value={options.chroma_quality}
+                            onInput={this.onChange}
+                          >
+                            Chroma quality:
+                          </Range>
+                        </div>
+                        : null
+                      }
+                    </Expander>
+                  </div>
+                  : null
+                }
+              </Expander>
              <label class={style.optionInputFirst}>
                <Checkbox
                  name="baseline"
@@ -119,18 +190,6 @@ export default class MozJPEGEncoderOptions extends Component<Props, State> {
                  Smoothing:
                </Range>
              </div>
-              <label class={style.optionTextFirst}>
-                Channels:
-                <Select
-                  name="color_space"
-                  value={options.color_space}
-                  onChange={this.onChange}
-                >
-                  <option value={MozJpegColorSpace.GRAYSCALE}>Grayscale</option>
-                  <option value={MozJpegColorSpace.RGB}>RGB</option>
-                  <option value={MozJpegColorSpace.YCbCr}>YCbCr</option>
-                </Select>
-              </label>
              <label class={style.optionTextFirst}>
                Quantization:
                <Select
--- a/src/codecs/webp/options.tsx
+++ b/src/codecs/webp/options.tsx
@@ -26,8 +26,10 @@ const losslessPresets:[number, number][] = [
 ];
 const losslessPresetDefault = 6;

-function determineLosslessQuality(quality: number): number {
-  const index = losslessPresets.findIndex(item => item[1] === quality);
+function determineLosslessQuality(quality: number, method: number): number {
+  const index = losslessPresets.findIndex(
+    ([presetMethod, presetQuality]) => presetMethod === method && presetQuality === quality,
+  );
  if (index !== -1) return index;
  // Quality doesn't match one of the presets.
  // This can happen when toggling 'lossless'.
@@ -45,7 +47,7 @@ export default class WebPEncoderOptions extends Component<Props, State> {
    const lossless = inputFieldCheckedAsNumber(form.lossless);
    const { options } = this.props;
    const losslessPresetValue = inputFieldValueAsNumber(
-      form.lossless_preset, determineLosslessQuality(options.quality),
+      form.lossless_preset, determineLosslessQuality(options.quality, options.method),
    );

    const newOptions: EncodeOptions = {
@@ -97,7 +99,7 @@ export default class WebPEncoderOptions extends Component<Props, State> {
            name="lossless_preset"
            min="0"
            max="9"
-            value={determineLosslessQuality(options.quality)}
+            value={determineLosslessQuality(options.quality, options.method)}
            onInput={this.onChange}
          >
            Effort:
--- a/src/components/App/custom-els/FileDrop/index.ts
+++ b/src/components/App/custom-els/FileDrop/index.ts
@@ -1,153 +0,0 @@
-import { bind } from '../../../../lib/initial-util';
-import './styles.css';
-
-// tslint:disable-next-line:max-line-length
-function firstMatchingItem(list: DataTransferItemList, acceptVal: string): DataTransferItem | undefined {
-  // Split accepts values by ',' then by '/'. Trim everything & lowercase.
-  const accepts = acceptVal.toLowerCase().split(',').map((accept) => {
-    return accept.trim().split('/').map(part => part.trim());
-  }).filter(acceptParts => acceptParts.length === 2); // Filter invalid values
-
-  return Array.from(list).find((item) => {
-    if (item.kind !== 'file') return false;
-
-    // 'Parse' the type.
-    const [typeMain, typeSub] = item.type.toLowerCase().split('/').map(s => s.trim());
-
-    for (const [acceptMain, acceptSub] of accepts) {
-      // Look for an exact match, or a partial match if * is accepted, eg image/*.
-      if (typeMain === acceptMain && (acceptSub === '*' || typeSub === acceptSub)) {
-        return true;
-      }
-    }
-    return false;
-  });
-}
-
-function getFileData(data: DataTransfer, accept: string): File | undefined {
-  const dragDataItem = firstMatchingItem(data.items, accept);
-  if (!dragDataItem) return;
-
-  return dragDataItem.getAsFile() || undefined;
-}
-
-interface FileDropEventInit extends EventInit {
-  action: FileDropAccept;
-  file: File;
-}
-
-type FileDropAccept = 'drop' | 'paste';
-
-// Safari and Edge don't quite support extending Event, this works around it.
-function fixExtendedEvent(instance: Event, type: Function) {
-  if (!(instance instanceof type)) {
-    Object.setPrototypeOf(instance, type.prototype);
-  }
-}
-
-export class FileDropEvent extends Event {
-  private _action: FileDropAccept;
-  private _file: File;
-  constructor(typeArg: string, eventInitDict: FileDropEventInit) {
-    super(typeArg, eventInitDict);
-    fixExtendedEvent(this, FileDropEvent);
-    this._file = eventInitDict.file;
-    this._action = eventInitDict.action;
-  }
-
-  get action() {
-    return this._action;
-  }
-
-  get file() {
-    return this._file;
-  }
-}
-
-/*
-  Example Usage.
-  <file-drop
-    accept='image/*'
-    class='drop-valid|drop-invalid'
-  >
-   [everything in here is a drop target.]
-  </file-drop>
-
-  dropElement.addEventListner('dropfile', (event) => console.log(event.detail))
-*/
-export class FileDrop extends HTMLElement {
-
-  private _dragEnterCount = 0;
-
-  constructor() {
-    super();
-    this.addEventListener('dragover', event => event.preventDefault());
-    this.addEventListener('drop', this._onDrop);
-    this.addEventListener('dragenter', this._onDragEnter);
-    this.addEventListener('dragend', () => this._reset());
-    this.addEventListener('dragleave', this._onDragLeave);
-    this.addEventListener('paste', this._onPaste);
-  }
-
-  get accept() {
-    return this.getAttribute('accept') || '';
-  }
-
-  set accept(val: string) {
-    this.setAttribute('accept', val);
-  }
-
-  @bind
-  private _onDragEnter(event: DragEvent) {
-    this._dragEnterCount += 1;
-    if (this._dragEnterCount > 1) return;
-
-    // We don't have data, attempt to get it and if it matches, set the correct state.
-    const validDrop: boolean = event.dataTransfer.items.length ?
-      !!firstMatchingItem(event.dataTransfer.items, this.accept) :
-      // Safari doesn't give file information on drag enter, so the best we can do is return valid.
-      true;
-
-    if (validDrop) {
-      this.classList.add('drop-valid');
-    } else {
-      this.classList.add('drop-invalid');
-    }
-  }
-
-  @bind
-  private _onDragLeave() {
-    this._dragEnterCount -= 1;
-    if (this._dragEnterCount === 0) {
-      this._reset();
-    }
-  }
-
-  @bind
-  private _onDrop(event: DragEvent) {
-    event.preventDefault();
-    this._reset();
-    const action = 'drop';
-    const file = getFileData(event.dataTransfer, this.accept);
-    if (file === undefined) return;
-
-    this.dispatchEvent(new FileDropEvent('filedrop', { action, file }));
-  }
-
-  @bind
-  private _onPaste(event: ClipboardEvent) {
-    const action = 'paste';
-    const file = getFileData(event.clipboardData, this.accept);
-    if (file === undefined) return;
-
-    this.dispatchEvent(new FileDropEvent('filedrop', { action, file }));
-  }
-
-  private _reset() {
-    this._dragEnterCount = 0;
-    this.classList.remove('drop-valid');
-    this.classList.remove('drop-invalid');
-  }
-}
-
-customElements.define('file-drop', FileDrop);
--- a/src/components/App/custom-els/FileDrop/missing-types.d.ts
+++ b/src/components/App/custom-els/FileDrop/missing-types.d.ts
@@ -1,19 +0,0 @@
-import { FileDropEvent, FileDrop } from '.';
-
-declare global {
-
-  interface HTMLElementEventMap {
-    'filedrop': FileDropEvent;
-  }
-
-  namespace JSX {
-    interface IntrinsicElements {
-      'file-drop': FileDropAttributes;
-    }
-
-    interface FileDropAttributes extends HTMLAttributes {
-      accept?: string;
-      onfiledrop?: ((this: FileDrop, ev: FileDropEvent) => any) | null;
-    }
-  }
-}
--- a/src/components/App/custom-els/FileDrop/styles.css
+++ b/src/components/App/custom-els/FileDrop/styles.css
@@ -1,3 +0,0 @@
-file-drop {
-  display: block;
-}
--- a/src/components/App/index.tsx
+++ b/src/components/App/index.tsx
@@ -2,9 +2,9 @@ import { h, Component } from 'preact';

 import { bind, linkRef, Fileish } from '../../lib/initial-util';
 import * as style from './style.scss';
-import { FileDropEvent } from './custom-els/FileDrop';
-import './custom-els/FileDrop';
-import SnackBarElement from '../../lib/SnackBar';
+import { FileDropEvent } from 'file-drop-element';
+import 'file-drop-element';
+import SnackBarElement, { SnackOptions } from '../../lib/SnackBar';
 import '../../lib/SnackBar';
 import Intro from '../intro';
 import '../custom-els/LoadingSpinner';
@@ -39,7 +39,7 @@ export default class App extends Component<Props, State> {
    import('../compress').then((module) => {
      this.setState({ Compress: module.default });
    }).catch(() => {
-      this.showError('Failed to load app');
+      this.showSnack('Failed to load app');
    });

    // In development, persist application state across hot reloads:
@@ -66,9 +66,9 @@ export default class App extends Component<Props, State> {
  }

  @bind
-  private showError(error: string) {
+  private showSnack(message: string, options: SnackOptions = {}): Promise<string> {
    if (!this.snackbar) throw Error('Snackbar missing');
-    this.snackbar.showSnackbar({ message: error });
+    return this.snackbar.showSnackbar(message, options);
  }

  render({}: Props, { file, Compress }: State) {
@@ -76,9 +76,9 @@ export default class App extends Component<Props, State> {
      <div id="app" class={style.app}>
        <file-drop accept="image/*" onfiledrop={this.onFileDrop} class={style.drop}>
          {(!file)
-            ? <Intro onFile={this.onIntroPickFile} onError={this.showError} />
+            ? <Intro onFile={this.onIntroPickFile} showSnack={this.showSnack} />
            : (Compress)
-              ? <Compress file={file} onError={this.showError} />
+              ? <Compress file={file} showSnack={this.showSnack} />
              : <loading-spinner class={style.appLoader}/>
          }
          <snack-bar ref={linkRef(this, 'snackbar')} />
--- a/src/components/Options/index.tsx
+++ b/src/components/Options/index.tsx
@@ -1,7 +1,7 @@
 import { h, Component } from 'preact';

 import * as style from './style.scss';
-import { bind, Fileish } from '../../lib/initial-util';
+import { bind } from '../../lib/initial-util';
 import { cleanSet, cleanMerge } from '../../lib/clean-modify';
 import OptiPNGEncoderOptions from '../../codecs/optipng/options';
 import MozJpegEncoderOptions from '../../codecs/mozjpeg/options';
@@ -35,13 +35,10 @@ import {
 import { QuantizeOptions } from '../../codecs/imagequant/processor-meta';
 import { ResizeOptions } from '../../codecs/resize/processor-meta';
 import { PreprocessorState } from '../../codecs/preprocessors';
-import FileSize from './FileSize';
-import { DownloadIcon } from '../../lib/icons';
 import { SourceImage } from '../App';
 import Checkbox from '../checkbox';
 import Expander from '../expander';
 import Select from '../select';
-import '../custom-els/LoadingSpinner';

 const encoderOptionsComponentMap = {
  [identity.type]: undefined,
@@ -60,55 +57,29 @@ const encoderOptionsComponentMap = {
 };

 interface Props {
-  orientation: 'horizontal' | 'vertical';
-  loading: boolean;
+  mobileView: boolean;
  source?: SourceImage;
-  imageIndex: number;
-  imageFile?: Fileish;
-  downloadUrl?: string;
  encoderState: EncoderState;
  preprocessorState: PreprocessorState;
  onEncoderTypeChange(newType: EncoderType): void;
  onEncoderOptionsChange(newOptions: EncoderOptions): void;
  onPreprocessorOptionsChange(newOptions: PreprocessorState): void;
-  onCopyToOtherClick(): void;
 }

 interface State {
  encoderSupportMap?: EncoderSupportMap;
-  showLoadingState: boolean;
 }

-const loadingReactionDelay = 500;
-
 export default class Options extends Component<Props, State> {
  state: State = {
    encoderSupportMap: undefined,
-    showLoadingState: false,
  };

-  /** The timeout ID between entering the loading state, and changing UI */
-  private loadingTimeoutId: number = 0;
-
  constructor() {
    super();
    encodersSupported.then(encoderSupportMap => this.setState({ encoderSupportMap }));
  }

-  componentDidUpdate(prevProps: Props, prevState: State) {
-    if (prevProps.loading && !this.props.loading) {
-      // Just stopped loading
-      clearTimeout(this.loadingTimeoutId);
-      this.setState({ showLoadingState: false });
-    } else if (!prevProps.loading && this.props.loading) {
-      // Just started loading
-      this.loadingTimeoutId = self.setTimeout(
-        () => this.setState({ showLoadingState: true }),
-        loadingReactionDelay,
-      );
-    }
-  }
-
  @bind
  onEncoderTypeChange(event: Event) {
    const el = event.currentTarget as HTMLSelectElement;
@@ -143,30 +114,20 @@ export default class Options extends Component<Props, State> {
    );
  }

-  @bind
-  onCopyToOtherClick(event: Event) {
-    event.preventDefault();
-    this.props.onCopyToOtherClick();
-  }
-
  render(
    {
      source,
-      imageIndex,
-      imageFile,
-      downloadUrl,
-      orientation,
      encoderState,
      preprocessorState,
      onEncoderOptionsChange,
    }: Props,
-    { encoderSupportMap, showLoadingState }: State,
+    { encoderSupportMap }: State,
  ) {
    // tslint:disable variable-name
    const EncoderOptionComponent = encoderOptionsComponentMap[encoderState.type];

    return (
-      <div class={style.options}>
+      <div class={style.optionsScroller}>
        <Expander>
          {encoderState.type === identity.type ? null :
            <div>
@@ -211,67 +172,30 @@ export default class Options extends Component<Props, State> {

        <h3 class={style.optionsTitle}>Compress</h3>

-        <div class={style.optionsScroller}>
-          <section class={`${style.optionOneCell} ${style.optionsSection}`}>
-            {encoderSupportMap ?
-              <Select value={encoderState.type} onChange={this.onEncoderTypeChange} large>
-                {encoders.filter(encoder => encoderSupportMap[encoder.type]).map(encoder => (
-                  <option value={encoder.type}>{encoder.label}</option>
-                ))}
-              </Select>
-              :
-              <Select large><option>Loading…</option></Select>
-            }
-          </section>
-
-          <Expander>
-            {EncoderOptionComponent ?
-              <EncoderOptionComponent
-                options={
-                  // Casting options, as encoderOptionsComponentMap[encodeData.type] ensures
-                  // the correct type, but typescript isn't smart enough.
-                  encoderState.options as any
-                }
-                onChange={onEncoderOptionsChange}
-              />
-            : null}
-          </Expander>
-        </div>
-
-        <div class={style.optionsCopy}>
-          <button onClick={this.onCopyToOtherClick} class={style.copyButton}>
-            {imageIndex === 1 && '← '}
-            Copy settings across
-            {imageIndex === 0 && ' →'}
-          </button>
-        </div>
-
-        <div class={style.results}>
-          <div class={style.resultData}>
-            {!imageFile || showLoadingState ? 'Working…' :
-              <FileSize
-                blob={imageFile}
-                compareTo={(source && imageFile !== source.file) ? source.file : undefined}
-              />
-            }
-          </div>
-
-          <div class={style.download}>
-            {(downloadUrl && imageFile) && (
-              <a
-                class={`${style.downloadLink} ${showLoadingState ? style.downloadLinkDisable : ''}`}
-                href={downloadUrl}
-                download={imageFile.name}
-                title="Download"
-              >
-                <DownloadIcon class={style.downloadIcon} />
-              </a>
-            )}
-            {showLoadingState && <loading-spinner class={style.spinner} />}
-          </div>
-
-        </div>
+        <section class={`${style.optionOneCell} ${style.optionsSection}`}>
+          {encoderSupportMap ?
+            <Select value={encoderState.type} onChange={this.onEncoderTypeChange} large>
+              {encoders.filter(encoder => encoderSupportMap[encoder.type]).map(encoder => (
+                <option value={encoder.type}>{encoder.label}</option>
+              ))}
+            </Select>
+            :
+            <Select large><option>Loading…</option></Select>
+          }
+        </section>

+        <Expander>
+          {EncoderOptionComponent ?
+            <EncoderOptionComponent
+              options={
+                // Casting options, as encoderOptionsComponentMap[encodeData.type] ensures
+                // the correct type, but typescript isn't smart enough.
+                encoderState.options as any
+              }
+              onChange={onEncoderOptionsChange}
+            />
+          : null}
+        </Expander>
      </div>
    );
  }
--- a/src/components/Options/style.scss
+++ b/src/components/Options/style.scss
@@ -1,15 +1,5 @@
 $horizontalPadding: 15px;

-.options {
-  color: #fff;
-  width: 300px;
-  opacity: 0.9;
-  font-size: 1.2rem;
-  max-height: 100%;
-  display: flex;
-  flex-flow: column;
-}
-
 .options-title {
  background: rgba(0, 0, 0, 0.9);
  margin: 0;
@@ -65,102 +55,3 @@ $horizontalPadding: 15px;
  overflow-x: hidden;
  overflow-y: auto;
 }
-
-.results {
-  display: grid;
-  grid-template-columns: 1fr auto;
-  background: rgba(0, 0, 0, 0.9);
-  font-size: 1.4rem;
-}
-
-.result-data {
-  display: flex;
-  align-items: center;
-  padding: 0 $horizontalPadding;
-}
-
-.size-delta {
-  font-size: 1.1rem;
-  font-style: italic;
-  position: relative;
-  top: -1px;
-  margin-left: 0.3em;
-}
-
-.size-increase {
-  color: #e35050;
-}
-
-.size-decrease {
-  color: #50e3c2;
-}
-
-.options-copy {
-  display: grid;
-  background: rgba(0, 0, 0, 0.9);
-  padding: 5px;
-}
-
-.copy-button {
-  composes: unbutton from '../../lib/util.scss';
-  background: #484848;
-  border-radius: 4px;
-  color: #fff;
-  text-align: left;
-  padding: 5px 10px;
-}
-
-@keyframes action-enter {
-  from {
-    transform: rotate(-90deg);
-    opacity: 0;
-    animation-timing-function: ease-out;
-  }
-}
-
-@keyframes action-leave {
-  from {
-    transform: rotate(0deg);
-    opacity: 1;
-    animation-timing-function: ease-out;
-  }
-}
-
-.download {
-  background: #34B9EB;
-  --size: 38px;
-  width: var(--size);
-  height: var(--size);
-  display: grid;
-  align-items: center;
-  justify-items: center;
-}
-
-.download-link {
-  animation: action-enter 0.2s;
-  grid-area: 1/1;
-}
-
-.download-link-disable {
-  pointer-events: none;
-  opacity: 0;
-  transform: rotate(90deg);
-  animation: action-leave 0.2s;
-}
-
-.download-icon {
-  color: #fff;
-  display: block;
-  --size: 24px;
-  width: var(--size);
-  height: var(--size);
-  padding: 7px;
-  filter: drop-shadow(0 1px 0 rgba(0, 0, 0, 0.7));
-}
-
-.spinner {
-  --color: #fff;
-  --delay: 0;
-  --size: 22px;
-  grid-area: 1/1;
-}
--- a/src/components/Output/custom-els/TwoUp/styles.css
+++ b/src/components/Output/custom-els/TwoUp/styles.css
@@ -56,7 +56,7 @@ two-up[legacy-clip-compat] > :not(.two-up-handle) {
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
  color: var(--thumb-color);
  box-sizing: border-box;
-  padding: 0 48%;
+  padding: 0 calc(var(--thumb-size) * 0.24);
 }

 .scrubber svg {
--- a/src/components/Output/index.tsx
+++ b/src/components/Output/index.tsx
@@ -10,7 +10,7 @@ import { twoUpHandle } from './custom-els/TwoUp/styles.css';

 interface Props {
  originalImage?: ImageData;
-  orientation: 'horizontal' | 'vertical';
+  mobileView: boolean;
  leftCompressed?: ImageData;
  rightCompressed?: ImageData;
  leftImgContain: boolean;
@@ -180,10 +180,7 @@ export default class Output extends Component<Props, State> {
  }

  render(
-    {
-      orientation, leftCompressed, rightCompressed, leftImgContain, rightImgContain,
-      originalImage,
-    }: Props,
+    { mobileView, leftImgContain, rightImgContain, originalImage }: Props,
    { scale, editingScale, altBackground }: State,
  ) {
    const leftDraw = this.leftDrawable();
@@ -194,7 +191,7 @@ export default class Output extends Component<Props, State> {
        <two-up
          legacy-clip-compat
          class={style.twoUp}
-          orientation={orientation}
+          orientation={mobileView ? 'vertical' : 'horizontal'}
          // Event redirecting. See onRetargetableEvent.
          onTouchStartCapture={this.onRetargetableEvent}
          onTouchEndCapture={this.onRetargetableEvent}
--- a/src/components/Output/style.scss
+++ b/src/components/Output/style.scss
@@ -1,7 +1,3 @@
-/*
-Note: These styles are temporary. They will be replaced before going live.
-*/
-
 .output {
  composes: abs-fill from '../../lib/util.scss';

@@ -47,6 +43,12 @@ Note: These styles are temporary. They will be replaced before going live.
  flex-wrap: wrap;
  contain: content;

+  // Allow clicks to fall through to the pinch zoom area
+  pointer-events: none;
+  & > * {
+    pointer-events: auto;
+  }
+
  @media (min-width: 860px) {
    top: auto;
    left: 320px;
@@ -127,4 +129,8 @@ Note: These styles are temporary. They will be replaced before going live.

 .output-canvas {
  flex-shrink: 0;
+  // This fixes a severe painting bug in Chrome.
+  // We should try to remove this once the issue is fixed.
+  // https://bugs.chromium.org/p/chromium/issues/detail?id=870222#c10
+  will-change: auto;
 }
--- a/src/components/compress/custom-els/MultiPanel/index.ts
+++ b/src/components/compress/custom-els/MultiPanel/index.ts
@@ -1,19 +1,75 @@
-import './styles.css';
+import * as style from './styles.css';
+import { transitionHeight } from '../../../../lib/util';

-function getClosestHeading(el: Element) {
-  const closestEl = el.closest('multi-panel > *');
-  if (closestEl && closestEl.classList.contains('panel-heading')) {
-    return closestEl;
+interface CloseAllOptions {
+  exceptFirst?: boolean;
+}
+
+const openOneOnlyAttr = 'open-one-only';
+
+function getClosestHeading(el: Element): HTMLElement | undefined {
+  // Look for the child of multi-panel, but stop at interactive elements like links & buttons
+  const closestEl = el.closest('multi-panel > *, a, button');
+  if (closestEl && closestEl.classList.contains(style.panelHeading)) {
+    return closestEl as HTMLElement;
  }
  return undefined;
 }

+async function close(heading: HTMLElement) {
+  const content = heading.nextElementSibling as HTMLElement;
+
+  // if there is no content, nothing to expand
+  if (!content) return;
+
+  const from = content.getBoundingClientRect().height;
+
+  heading.removeAttribute('content-expanded');
+  content.setAttribute('aria-expanded', 'false');
+
+  // Wait a microtask so other calls to open/close can get the final sizes.
+  await null;
+
+  await transitionHeight(content, {
+    from,
+    to: 0,
+    duration: 300,
+  });
+
+  content.style.height = '';
+}
+
+async function open(heading: HTMLElement) {
+  const content = heading.nextElementSibling as HTMLElement;
+
+  // if there is no content, nothing to expand
+  if (!content) return;
+
+  const from = content.getBoundingClientRect().height;
+
+  heading.setAttribute('content-expanded', '');
+  content.setAttribute('aria-expanded', 'true');
+
+  const to = content.getBoundingClientRect().height;
+
+  // Wait a microtask so other calls to open/close can get the final sizes.
+  await null;
+
+  await transitionHeight(content, {
+    from, to,
+    duration: 300,
+  });
+
+  content.style.height = '';
+}
+
 /**
 * A multi-panel view that the user can add any number of 'panels'.
 * 'a panel' consists of two elements. Even index element becomes heading,
 * and odd index element becomes the expandable content.
 */
 export default class MultiPanel extends HTMLElement {
+  static get observedAttributes() { return [openOneOnlyAttr]; }

  constructor() {
    super();
@@ -31,12 +87,18 @@ export default class MultiPanel extends HTMLElement {
    this._childrenChange();
  }

+  attributeChangedCallback(name: string, oldValue: string | null, newValue: string | null) {
+    if (name === openOneOnlyAttr && newValue === null) {
+      this._closeAll({ exceptFirst: true });
+    }
+  }
+
  // Click event handler
  private _onClick(event: MouseEvent) {
-    const el = event.target as Element;
+    const el = event.target as HTMLElement;
    const heading = getClosestHeading(el);
    if (!heading) return;
-    this._expand(heading);
+    this._toggle(heading);
  }

  // KeyDown event handler
@@ -53,7 +115,8 @@ export default class MultiPanel extends HTMLElement {
    // don’t handle modifier shortcuts used by assistive technology.
    if (event.altKey) return;

-    let newHeading:HTMLElement | undefined;
+    let newHeading: HTMLElement | undefined;
+
    switch (event.key) {
      case 'ArrowLeft':
      case 'ArrowUp':
@@ -77,7 +140,7 @@ export default class MultiPanel extends HTMLElement {
      case 'Enter':
      case ' ':
      case 'Spacebar':
-        this._expand(heading);
+        this._toggle(heading);
        break;

      // Any other key press is ignored and passed back to the browser.
@@ -93,26 +156,32 @@ export default class MultiPanel extends HTMLElement {
    }
  }

-  private _expand(heading: Element) {
+  private _toggle(heading: HTMLElement) {
    if (!heading) return;
-    const content = heading.nextElementSibling;
-
-    // if there is no content, nothing to expand
-    if (!content) return;

    // toggle expanded and aria-expanded attributes
-    if (content.hasAttribute('expanded')) {
-      content.removeAttribute('expanded');
-      content.setAttribute('aria-expanded', 'false');
+    if (heading.hasAttribute('content-expanded')) {
+      close(heading);
    } else {
-      content.setAttribute('expanded', '');
-      content.setAttribute('aria-expanded', 'true');
+      if (this.openOneOnly) this._closeAll();
+      open(heading);
    }
  }

+  private _closeAll(options: CloseAllOptions = {}): void {
+    const { exceptFirst = false } = options;
+    let els = [...this.children].filter(el => el.matches('[content-expanded]')) as HTMLElement[];
+
+    if (exceptFirst) {
+      els = els.slice(1);
+    }
+
+    for (const el of els) close(el);
+  }
+
  // children of multi-panel should always be even number (heading/content pair)
  private _childrenChange() {
-    let preserveTabIndex : boolean = false;
+    let preserveTabIndex = false;
    let heading = this.firstElementChild;

    while (heading) {
@@ -123,31 +192,23 @@ export default class MultiPanel extends HTMLElement {
      // it means it has odd number of elements. log error and set heading to end the loop.
      if (!content) {
        console.error('<multi-panel> requires an even number of element children.');
-        heading = null;
-        continue;
+        break;
      }

      // When odd number of elements were inserted in the middle,
      // what was heading before may become content after the insertion.
      // Remove classes and attributes to prepare for this change.
-      heading.classList.remove('panel-content');
-
-      if (content.classList.contains('panel-heading')) {
-        content.classList.remove('panel-heading');
-      }
-      if (heading.hasAttribute('expanded') && heading.hasAttribute('aria-expanded')) {
-        heading.removeAttribute('expanded');
-        heading.removeAttribute('aria-expanded');
-      }
+      heading.classList.remove(style.panelContent);
+      content.classList.remove(style.panelHeading);
+      heading.removeAttribute('aria-expanded');
+      heading.removeAttribute('content-expanded');

      // If appreciable, remove tabindex from content which used to be header.
-      if (content.hasAttribute('tabindex')) {
-        content.removeAttribute('tabindex');
-      }
+      content.removeAttribute('tabindex');

      // Assign heading and content classes
-      heading.classList.add('panel-heading');
-      content.classList.add('panel-content');
+      heading.classList.add(style.panelHeading);
+      content.classList.add(style.panelContent);

      // Assign ids and aria-X for heading/content pair.
      heading.id = `panel-heading-${randomId}`;
@@ -163,6 +224,13 @@ export default class MultiPanel extends HTMLElement {
        heading.setAttribute('tabindex', '-1');
      }

+      // It's possible that the heading & content expanded attributes are now out of sync. Resync
+      // them using the heading as the source of truth.
+      content.setAttribute(
+        'aria-expanded',
+        heading.hasAttribute('content-expanded') ? 'true' : 'false',
+      );
+
      // next sibling of content = next heading
      heading = content.nextElementSibling;
    }
@@ -171,6 +239,9 @@ export default class MultiPanel extends HTMLElement {
    if (!preserveTabIndex && this.firstElementChild) {
      this.firstElementChild.setAttribute('tabindex', '0');
    }
+
+    // In case we're openOneOnly, and an additional open item has been added:
+    if (this.openOneOnly) this._closeAll({ exceptFirst: true });
  }

  // returns heading that is before currently selected one.
@@ -208,7 +279,7 @@ export default class MultiPanel extends HTMLElement {
  private _lastHeading() {
    // if the last element is heading, return last element
    const lastEl = this.lastElementChild as HTMLElement;
-    if (lastEl && lastEl.classList.contains('panel-heading')) {
+    if (lastEl && lastEl.classList.contains(style.panelHeading)) {
      return lastEl;
    }
    // otherwise return 2nd from the last
@@ -217,6 +288,21 @@ export default class MultiPanel extends HTMLElement {
      return lastContent.previousElementSibling as HTMLElement;
    }
  }
+
+  /**
+   * If true, only one panel can be open at once. When one opens, others close.
+   */
+  get openOneOnly() {
+    return this.hasAttribute(openOneOnlyAttr);
+  }
+
+  set openOneOnly(val: boolean) {
+    if (val) {
+      this.setAttribute(openOneOnlyAttr, '');
+    } else {
+      this.removeAttribute(openOneOnlyAttr);
+    }
+  }
 }

 customElements.define('multi-panel', MultiPanel);
--- a/src/components/compress/custom-els/MultiPanel/missing-types.d.ts
+++ b/src/components/compress/custom-els/MultiPanel/missing-types.d.ts
@@ -0,0 +1,9 @@
+interface MultiPanelAttributes extends JSX.HTMLAttributes {
+  'open-one-only'?: boolean;
+}
+
+declare namespace JSX {
+  interface IntrinsicElements {
+    'multi-panel': MultiPanelAttributes;
+  }
+}
--- a/src/components/compress/custom-els/MultiPanel/styles.css
+++ b/src/components/compress/custom-els/MultiPanel/styles.css
@@ -0,0 +1,10 @@
+.panel-heading {
+  background: gray;
+}
+.panel-content {
+  height: 0px;
+  overflow: auto;
+}
+.panel-content[aria-expanded=true] {
+  height: auto;
+}
--- a/src/components/compress/index.tsx
+++ b/src/components/compress/index.tsx
@@ -24,18 +24,18 @@ import {
    EncoderOptions,
    encoderMap,
 } from '../../codecs/encoders';
-
 import {
  PreprocessorState,
  defaultPreprocessorState,
 } from '../../codecs/preprocessors';
-
 import { decodeImage } from '../../codecs/decoders';
 import { cleanMerge, cleanSet } from '../../lib/clean-modify';
 import Processor from '../../codecs/processor';
 import { VectorResizeOptions, BitmapResizeOptions } from '../../codecs/resize/processor-meta';
-
-type Orientation = 'horizontal' | 'vertical';
+import './custom-els/MultiPanel';
+import Results from '../results';
+import { ExpandIcon, CopyAcrossIconProps } from '../../lib/icons';
+import SnackBarElement from 'src/lib/SnackBar';

 export interface SourceImage {
  file: File | Fileish;
@@ -59,7 +59,7 @@ interface EncodedImage {

 interface Props {
  file: File | Fileish;
-  onError: (msg: string) => void;
+  showSnack: SnackBarElement['showSnackbar'];
 }

 interface State {
@@ -69,7 +69,7 @@ interface State {
  loading: boolean;
  loadingCounter: number;
  error?: string;
-  orientation: Orientation;
+  mobileView: boolean;
 }

 interface UpdateImageOptions {
@@ -137,7 +137,7 @@ async function processSvg(blob: Blob): Promise<HTMLImageElement> {
  const parser = new DOMParser();
  const text = await blobToText(blob);
  const document = parser.parseFromString(text, 'image/svg+xml');
-  const svg = document.documentElement;
+  const svg = document.documentElement!;

  if (svg.hasAttribute('width') && svg.hasAttribute('height')) {
    return blobToImg(blob);
@@ -155,8 +155,14 @@ async function processSvg(blob: Blob): Promise<HTMLImageElement> {
  return blobToImg(new Blob([newSource], { type: 'image/svg+xml' }));
 }

+// These are only used in the mobile view
+const resultTitles = ['Top', 'Bottom'];
+// These are only used in the desktop view
+const buttonPositions =
+  ['download-left', 'download-right'] as ('download-left' | 'download-right')[];
+
 export default class Compress extends Component<Props, State> {
-  widthQuery = window.matchMedia('(min-width: 500px)');
+  widthQuery = window.matchMedia('(max-width: 599px)');

  state: State = {
    source: undefined,
@@ -178,7 +184,7 @@ export default class Compress extends Component<Props, State> {
        loading: false,
      },
    ],
-    orientation: this.widthQuery.matches ? 'horizontal' : 'vertical',
+    mobileView: this.widthQuery.matches,
  };

  private readonly encodeCache = new ResultCache();
@@ -193,7 +199,7 @@ export default class Compress extends Component<Props, State> {

  @bind
  private onMobileWidthChange() {
-    this.setState({ orientation: this.widthQuery.matches ? 'horizontal' : 'vertical' });
+    this.setState({ mobileView: this.widthQuery.matches });
  }

  private onEncoderTypeChange(index: 0 | 1, newType: EncoderType): void {
@@ -245,12 +251,24 @@ export default class Compress extends Component<Props, State> {
    }
  }

-  private onCopyToOtherClick(index: 0 | 1) {
+  private async onCopyToOtherClick(index: 0 | 1) {
    const otherIndex = (index + 1) % 2;
+    const oldSettings = this.state.images[otherIndex];

    this.setState({
      images: cleanSet(this.state.images, otherIndex, this.state.images[index]),
    });
+
+    const result = await this.props.showSnack('Settings copied across', {
+      timeout: 5000,
+      actions: ['undo', 'dismiss'],
+    });
+
+    if (result !== 'undo') return;
+
+    this.setState({
+      images: cleanSet(this.state.images, otherIndex, oldSettings),
+    });
  }

  @bind
@@ -313,7 +331,7 @@ export default class Compress extends Component<Props, State> {
      console.error(err);
      // Another file has been opened before this one processed.
      if (this.state.loadingCounter !== loadingCounter) return;
-      this.props.onError('Invalid image');
+      this.props.showSnack('Invalid image');
      this.setState({ loading: false });
    }
  }
@@ -372,7 +390,7 @@ export default class Compress extends Component<Props, State> {
        }
      } catch (err) {
        if (err.name === 'AbortError') return;
-        this.props.onError(`Processing error (type=${image.encoderState.type}): ${err}`);
+        this.props.showSnack(`Processing error (type=${image.encoderState.type}): ${err}`);
        throw err;
      }
    }
@@ -395,36 +413,73 @@ export default class Compress extends Component<Props, State> {
    this.setState({ images });
  }

-  render({ }: Props, { loading, images, source, orientation }: State) {
+  render({ }: Props, { loading, images, source, mobileView }: State) {
    const [leftImage, rightImage] = images;
    const [leftImageData, rightImageData] = images.map(i => i.data);

+    const options = images.map((image, index) => (
+      <Options
+        source={source}
+        mobileView={mobileView}
+        preprocessorState={image.preprocessorState}
+        encoderState={image.encoderState}
+        onEncoderTypeChange={this.onEncoderTypeChange.bind(this, index)}
+        onEncoderOptionsChange={this.onEncoderOptionsChange.bind(this, index)}
+        onPreprocessorOptionsChange={this.onPreprocessorOptionsChange.bind(this, index)}
+      />
+    ));
+
+    const copyDirections =
+      (mobileView ? ['down', 'up'] : ['right', 'left']) as CopyAcrossIconProps['copyDirection'][];
+
+    const results = images.map((image, index) => (
+      <Results
+        downloadUrl={image.downloadUrl}
+        imageFile={image.file}
+        source={source}
+        loading={loading || image.loading}
+        copyDirection={copyDirections[index]}
+        onCopyToOtherClick={this.onCopyToOtherClick.bind(this, index)}
+        buttonPosition={mobileView ? 'stack-right' : buttonPositions[index]}
+      >
+        {!mobileView ? null : [
+          <ExpandIcon class={style.expandIcon} key="expand-icon"/>,
+          `${resultTitles[index]} (${encoderMap[image.encoderState.type].label})`,
+        ]}
+      </Results>
+    ));
+
    return (
-      <div class={`${style.compress} ${style[orientation]}`}>
+      <div class={style.compress}>
        <Output
          originalImage={source && source.data}
-          orientation={orientation}
+          mobileView={mobileView}
          leftCompressed={leftImageData}
          rightCompressed={rightImageData}
          leftImgContain={leftImage.preprocessorState.resize.fitMethod === 'cover'}
          rightImgContain={rightImage.preprocessorState.resize.fitMethod === 'cover'}
        />
-        {images.map((image, index) => (
-          <Options
-            loading={loading || image.loading}
-            source={source}
-            orientation={orientation}
-            imageIndex={index}
-            imageFile={image.file}
-            downloadUrl={image.downloadUrl}
-            preprocessorState={image.preprocessorState}
-            encoderState={image.encoderState}
-            onEncoderTypeChange={this.onEncoderTypeChange.bind(this, index)}
-            onEncoderOptionsChange={this.onEncoderOptionsChange.bind(this, index)}
-            onPreprocessorOptionsChange={this.onPreprocessorOptionsChange.bind(this, index)}
-            onCopyToOtherClick={this.onCopyToOtherClick.bind(this, index)}
-          />
-        ))}
+        {mobileView
+          ? (
+            <div class={style.options}>
+              <multi-panel class={style.multiPanel} open-one-only>
+                {results[0]}
+                {options[0]}
+                {results[1]}
+                {options[1]}
+              </multi-panel>
+            </div>
+          ) : ([
+            <div class={style.options} key="options0">
+              {options[0]}
+              {results[0]}
+            </div>,
+            <div class={style.options} key="options1">
+              {options[1]}
+              {results[1]}
+            </div>,
+          ])
+        }
      </div>
    );
  }
--- a/src/components/compress/style.scss
+++ b/src/components/compress/style.scss
@@ -3,20 +3,72 @@
  height: 100%;
  contain: strict;
  display: grid;
+  align-items: end;
+  align-content: end;
+  grid-template-rows: 1fr auto;

-  &.horizontal {
+  @media (min-width: 600px) {
    grid-template-columns: 1fr auto;
-    grid-template-rows: calc(100% - 75px);
-
-    @media (min-width: 860px) {
-      grid-template-rows: 100%;
-    }
-    align-items: end;
-    align-content: end;
-  }
-
-  &.vertical {
-    // TODO: make the mobile view work
-    background: red;
+    grid-template-rows: 100%;
  }
 }
+
+.options {
+  color: #fff;
+  opacity: 0.9;
+  font-size: 1.2rem;
+  display: flex;
+  flex-flow: column;
+  max-width: 400px;
+  margin: 0 auto;
+  width: calc(100% - 60px);
+  max-height: calc(100% - 143px);
+  overflow: hidden;
+
+  @media (min-width: 600px) {
+    max-height: calc(100% - 75px);
+    width: 300px;
+    margin: 0;
+  }
+
+  @media (min-width: 860px) {
+    max-height: 100%;
+  }
+}
+
+.multi-panel {
+  position: relative;
+  display: flex;
+  flex-flow: column;
+
+  // Reorder so headings appear after content:
+  & > :nth-child(1) {
+    order: 2;
+    margin-bottom: 10px;
+  }
+
+  & > :nth-child(2) {
+    order: 1;
+  }
+
+  & > :nth-child(3) {
+    order: 4;
+  }
+
+  & > :nth-child(4) {
+    order: 3;
+  }
+}
+
+.expand-icon {
+  transform: rotate(180deg);
+  margin-left: -12px;
+}
+
+[content-expanded] .expand-icon {
+  transform: none;
+}
+
+:focus .expand-icon {
+  fill: #34B9EB;
+}
--- a/src/components/expander/index.tsx
+++ b/src/components/expander/index.tsx
@@ -1,6 +1,6 @@
 import { h, Component, ComponentChild, ComponentChildren } from 'preact';
 import * as style from './style.scss';
-import { linkRef } from '../../lib/initial-util';
+import { transitionHeight } from '../../lib/util';

 interface Props {
  children: ComponentChildren;
@@ -13,7 +13,6 @@ export default class Expander extends Component<Props, State> {
  state: State = {
    outgoingChildren: [],
  };
-  private el?: HTMLDivElement;
  private lastElHeight: number = 0;

  componentWillReceiveProps(nextProps: Props) {
@@ -32,10 +31,10 @@ export default class Expander extends Component<Props, State> {

    // Only interested if going from empty to not-empty, or not-empty to empty.
    if ((children[0] && nextChildren[0]) || (!children[0] && !nextChildren[0])) return;
-    this.lastElHeight = this.el!.getBoundingClientRect().height;
+    this.lastElHeight = this.base!.getBoundingClientRect().height;
  }

-  componentDidUpdate(previousProps: Props) {
+  async componentDidUpdate(previousProps: Props) {
    const children = this.props.children as ComponentChild[];
    const previousChildren = previousProps.children as ComponentChild[];

@@ -43,37 +42,20 @@ export default class Expander extends Component<Props, State> {
    if ((children[0] && previousChildren[0]) || (!children[0] && !previousChildren[0])) return;

    // What height do we need to transition to?
-    this.el!.style.transition = 'none';
-    this.el!.style.height = '';
-    const newHeight = children[0] ? this.el!.getBoundingClientRect().height : 0;
+    this.base!.style.height = '';
+    this.base!.style.overflow = 'hidden';
+    const newHeight = children[0] ? this.base!.getBoundingClientRect().height : 0;

-    if (this.lastElHeight === newHeight) {
-      this.el!.style.transition = '';
-      return;
-    }
+    await transitionHeight(this.base!, {
+      duration: 300,
+      from: this.lastElHeight,
+      to: newHeight,
+    });

-    // Set the currently rendered height absolutely.
-    this.el!.style.height = this.lastElHeight + 'px';
-    this.el!.style.transition = '';
-    this.el!.style.overflow = 'hidden';
-    // Force a style calc so the browser picks up the start value.
-    getComputedStyle(this.el!).height;
-    // Animate to the new height.
-    this.el!.style.height = newHeight + 'px';
-
-    const listener = () => {
-      // Unset the height & overflow, so element changes do the right thing.
-      this.el!.style.height = '';
-      this.el!.style.overflow = '';
-      this.el!.removeEventListener('transitionend', listener);
-      this.el!.removeEventListener('transitioncancel', listener);
-      if (this.state.outgoingChildren[0]) {
-        this.setState({ outgoingChildren: [] });
-      }
-    };
-
-    this.el!.addEventListener('transitionend', listener);
-    this.el!.addEventListener('transitioncancel', listener);
+    // Unset the height & overflow, so element changes do the right thing.
+    this.base!.style.height = '';
+    this.base!.style.overflow = '';
+    if (this.state.outgoingChildren[0]) this.setState({ outgoingChildren: [] });
  }

  render(props: Props, { outgoingChildren }: State) {
@@ -81,10 +63,7 @@ export default class Expander extends Component<Props, State> {
    const childrenExiting = !children[0] && outgoingChildren[0];

    return (
-      <div
-        ref={linkRef(this, 'el')}
-        class={`${style.expander} ${childrenExiting ? style.childrenExiting : ''}`}
-      >
+      <div class={childrenExiting ? style.childrenExiting : ''}>
        {children[0] ? children : outgoingChildren}
      </div>
    );
--- a/src/components/expander/style.scss
+++ b/src/components/expander/style.scss
@@ -1,7 +1,3 @@
-.expander {
-  transition: height 200ms ease-in-out;
-}
-
 .children-exiting {
  & > * {
    pointer-events: none;
--- a/src/components/intro/index.tsx
+++ b/src/components/intro/index.tsx
@@ -12,6 +12,7 @@ import artworkIcon from './imgs/demos/artwork-icon.jpg';
 import deviceScreenIcon from './imgs/demos/device-screen-icon.jpg';
 import logoIcon from './imgs/demos/logo-icon.png';
 import * as style from './style.scss';
+import SnackBarElement from '../../lib/SnackBar';

 const demos = [
  {
@@ -42,7 +43,7 @@ const demos = [

 interface Props {
  onFile: (file: File | Fileish) => void;
-  onError: (error: string) => void;
+  showSnack: SnackBarElement['showSnackbar'];
 }
 interface State {
  fetchingDemoIndex?: number;
@@ -79,7 +80,7 @@ export default class Intro extends Component<Props, State> {
      this.props.onFile(file);
    } catch (err) {
      this.setState({ fetchingDemoIndex: undefined });
-      this.props.onError("Couldn't fetch demo image");
+      this.props.showSnack("Couldn't fetch demo image");
    }
  }

--- a/src/components/output/custom-els/MultiPanel/styles.css
+++ b/src/components/output/custom-els/MultiPanel/styles.css
@@ -1,11 +0,0 @@
-multi-panel > .panel-heading {
-  background:gray;
-}
-multi-panel > .panel-content {
-  height:0px;
-  overflow:scroll;
-  transition: height 1s;
-}
-multi-panel > .panel-content[expanded] {
-  height:auto;
-}
--- a/src/components/results/FileSize.tsx
+++ b/src/components/results/FileSize.tsx
--- a/src/components/results/index.tsx
+++ b/src/components/results/index.tsx
@@ -0,0 +1,105 @@
+import { h, Component, ComponentChildren, ComponentChild } from 'preact';
+
+import * as style from './style.scss';
+import FileSize from './FileSize';
+import { DownloadIcon, CopyAcrossIcon, CopyAcrossIconProps } from '../../lib/icons';
+import '../custom-els/LoadingSpinner';
+import { SourceImage } from '../compress';
+import { Fileish, bind } from '../../lib/initial-util';
+
+interface Props {
+  loading: boolean;
+  source?: SourceImage;
+  imageFile?: Fileish;
+  downloadUrl?: string;
+  children: ComponentChildren;
+  copyDirection: CopyAcrossIconProps['copyDirection'];
+  buttonPosition: keyof typeof buttonPositionClass;
+  onCopyToOtherClick(): void;
+}
+
+interface State {
+  showLoadingState: boolean;
+}
+
+const buttonPositionClass = {
+  'stack-right': style.stackRight,
+  'download-right': style.downloadRight,
+  'download-left': style.downloadLeft,
+};
+
+const loadingReactionDelay = 500;
+
+export default class Results extends Component<Props, State> {
+  state: State = {
+    showLoadingState: false,
+  };
+
+  /** The timeout ID between entering the loading state, and changing UI */
+  private loadingTimeoutId: number = 0;
+
+  componentDidUpdate(prevProps: Props, prevState: State) {
+    if (prevProps.loading && !this.props.loading) {
+      // Just stopped loading
+      clearTimeout(this.loadingTimeoutId);
+      this.setState({ showLoadingState: false });
+    } else if (!prevProps.loading && this.props.loading) {
+      // Just started loading
+      this.loadingTimeoutId = self.setTimeout(
+        () => this.setState({ showLoadingState: true }),
+        loadingReactionDelay,
+      );
+    }
+  }
+
+  @bind
+  private onCopyToOtherClick(event: Event) {
+    event.preventDefault();
+    this.props.onCopyToOtherClick();
+  }
+
+  render(
+    { source, imageFile, downloadUrl, children, copyDirection, buttonPosition }: Props,
+    { showLoadingState }: State,
+  ) {
+
+    return (
+      <div class={`${style.results} ${buttonPositionClass[buttonPosition]}`}>
+        <div class={style.resultData}>
+          {(children as ComponentChild[])[0]
+            ? <div class={style.resultTitle}>{children}</div>
+            : null
+          }
+          {!imageFile || showLoadingState ? 'Working…' :
+            <FileSize
+              blob={imageFile}
+              compareTo={(source && imageFile !== source.file) ? source.file : undefined}
+            />
+          }
+        </div>
+
+        <button
+          class={style.copyToOther}
+          title="Copy settings to other side"
+          onClick={this.onCopyToOtherClick}
+        >
+          <CopyAcrossIcon class={style.copyIcon} copyDirection={copyDirection} />
+        </button>
+
+        <div class={style.download}>
+          {(downloadUrl && imageFile) && (
+            <a
+              class={`${style.downloadLink} ${showLoadingState ? style.downloadLinkDisable : ''}`}
+              href={downloadUrl}
+              download={imageFile.name}
+              title="Download"
+            >
+              <DownloadIcon class={style.downloadIcon} />
+            </a>
+          )}
+          {showLoadingState && <loading-spinner class={style.spinner} />}
+        </div>
+      </div>
+    );
+  }
+}
--- a/src/components/results/style.scss
+++ b/src/components/results/style.scss
@@ -0,0 +1,131 @@
+@keyframes action-enter {
+  from {
+    transform: rotate(-90deg);
+    opacity: 0;
+    animation-timing-function: ease-out;
+  }
+}
+
+@keyframes action-leave {
+  from {
+    transform: rotate(0deg);
+    opacity: 1;
+    animation-timing-function: ease-out;
+  }
+}
+
+.results {
+  display: grid;
+  grid-template-columns: [text] 1fr [copy-button] auto [download-button] auto;
+  background: rgba(0, 0, 0, 0.9);
+  font-size: 1rem;
+
+  @media (min-width: 400px) {
+    font-size: 1.2rem;
+  }
+
+  @media (min-width: 600px) {
+    font-size: 1.4rem;
+  }
+
+  &:focus {
+    outline: none;
+  }
+}
+
+.result-data {
+  grid-row: 1;
+  grid-column: text;
+  display: flex;
+  align-items: center;
+  padding: 0 10px;
+  white-space: nowrap;
+  overflow: hidden;
+}
+
+.download-right {
+  grid-template-columns: [copy-button] auto [text] 1fr [download-button] auto;
+}
+
+.download-left {
+  grid-template-columns: [download-button] auto [text] 1fr [copy-button] auto;
+}
+
+.stack-right {
+  & .result-data {
+    padding: 0 15px;
+  }
+}
+
+.result-title {
+  display: flex;
+  align-items: center;
+  margin-right: 0.4em;
+}
+
+.size-delta {
+  font-size: 0.8em;
+  font-style: italic;
+  position: relative;
+  top: -1px;
+  margin-left: 0.3em;
+}
+
+.size-increase {
+  color: #e35050;
+}
+
+.size-decrease {
+  color: #50e3c2;
+}
+
+.download {
+  grid-row: 1;
+  grid-column: download-button;
+  background: #34B9EB;
+  --size: 38px;
+  width: var(--size);
+  height: var(--size);
+  display: grid;
+  align-items: center;
+  justify-items: center;
+}
+
+.download-link {
+  animation: action-enter 0.2s;
+  grid-area: 1/1;
+}
+
+.download-link-disable {
+  pointer-events: none;
+  opacity: 0;
+  transform: rotate(90deg);
+  animation: action-leave 0.2s;
+}
+
+.download-icon,
+.copy-icon {
+  color: #fff;
+  display: block;
+  --size: 24px;
+  width: var(--size);
+  height: var(--size);
+  padding: 7px;
+  filter: drop-shadow(0 1px 0 rgba(0, 0, 0, 0.7));
+}
+
+.spinner {
+  --color: #fff;
+  --delay: 0;
+  --size: 22px;
+  grid-area: 1/1;
+}
+
+.copy-to-other {
+  grid-row: 1;
+  grid-column: copy-button;
+  composes: unbutton from '../../lib/util.scss';
+  composes: download;
+
+  background: #656565;
+}
--- a/src/custom-els/RangeInput/index.ts
+++ b/src/custom-els/RangeInput/index.ts
@@ -1,5 +1,6 @@
 import { bind } from '../../lib/initial-util';
 import * as style from './styles.css';
+import { PointerTracker } from '../../lib/PointerTracker';

 const RETARGETED_EVENTS = ['focus', 'blur'];
 const UPDATE_EVENTS = ['input', 'change'];
@@ -26,6 +27,17 @@ class RangeInputElement extends HTMLElement {
    this._input.type = 'range';
    this._input.className = style.input;

+    const tracker = new PointerTracker(this._input, {
+      start: (): boolean => {
+        if (tracker.currentPointers.length !== 0) return false;
+        this._input.classList.add(style.touchActive);
+        return true;
+      },
+      end: () => {
+        this._input.classList.remove(style.touchActive);
+      },
+    });
+
    for (const event of RETARGETED_EVENTS) {
      this._input.addEventListener(event, this._retargetEvent, true);
    }
@@ -45,6 +57,8 @@ class RangeInputElement extends HTMLElement {

    this.insertBefore(this._input, this.firstChild);
    this._valueDisplay = this.querySelector('.' + style.valueDisplay) as HTMLDivElement;
+    // Set inline styles (this is useful when used with frameworks which might clear inline styles)
+    this._update();
  }

  get labelPrecision(): string {
--- a/src/custom-els/RangeInput/styles.css
+++ b/src/custom-els/RangeInput/styles.css
@@ -84,11 +84,11 @@ range-input::before {
  overflow: hidden;
 }

-.input:active + .thumb-wrapper .value-display {
+.touch-active + .thumb-wrapper .value-display {
  opacity: 1;
  transform: scale(1);
 }

-.input:active + .thumb-wrapper .thumb {
+.touch-active + .thumb-wrapper .thumb {
  box-shadow: 0 1px 3px rgba(0,0,0,0.5);
 }
--- a/src/lib/SnackBar/index.ts
+++ b/src/lib/SnackBar/index.ts
@@ -1,114 +1,96 @@
-import './styles.css';
-
-const DEFAULT_TIMEOUT = 2750;
+import * as style from './styles.css';

 export interface SnackOptions {
-  message: string;
  timeout?: number;
-  actionText?: string;
-  actionHandler?: () => boolean | null;
+  actions?: string[];
 }

-export interface SnackShowResult {
-  action: boolean;
-}
+function createSnack(message: string, options: SnackOptions): [Element, Promise<string>] {
+  const {
+    timeout = 0,
+    actions = [],
+  } = options;

-class Snack {
-  private _onremove: ((result: SnackShowResult) => void)[] = [];
-  private _options: SnackOptions;
-  private _element: Element = document.createElement('div');
-  private _text: Element = document.createElement('div');
-  private _button: Element = document.createElement('button');
-  private _showing = false;
-  private _closeTimer?: number;
-  private _result: SnackShowResult = {
-    action: false,
-  };
+  // Provide a default 'dismiss' action
+  if (!timeout && actions.length === 0) actions.push('dismiss');

-  constructor (options: SnackOptions, callback?: (result: SnackShowResult) => void) {
-    this._options = options;
+  const el = document.createElement('div');
+  el.className = style.snackbar;
+  el.setAttribute('aria-live', 'assertive');
+  el.setAttribute('aria-atomic', 'true');
+  el.setAttribute('aria-hidden', 'false');

-    this._element.className = 'snackbar';
-    this._element.setAttribute('aria-live', 'assertive');
-    this._element.setAttribute('aria-atomic', 'true');
-    this._element.setAttribute('aria-hidden', 'true');
+  const text = document.createElement('div');
+  text.className = style.text;
+  text.textContent = message;
+  el.appendChild(text);

-    this._text.className = 'snackbar--text';
-    this._text.textContent = options.message;
-    this._element.appendChild(this._text);
+  const result = new Promise<string>((resolve) => {
+    let timeoutId: number;

-    if (options.actionText) {
-      this._button.className = 'snackbar--button';
-      this._button.textContent = options.actionText;
-      this._button.addEventListener('click', () => {
-        if (this._showing) {
-          if (options.actionHandler && options.actionHandler() === false) return;
-          this._result.action = true;
-        }
-        this.hide();
+    // Add action buttons
+    for (const action of actions) {
+      const button = document.createElement('button');
+      button.className = style.button;
+      button.textContent = action;
+      button.addEventListener('click', () => {
+        clearTimeout(timeoutId);
+        resolve(action);
      });
-      this._element.appendChild(this._button);
+      el.appendChild(button);
    }

-    if (callback) {
-      this._onremove.push(callback);
+    // Add timeout
+    if (timeout) {
+      timeoutId = self.setTimeout(
+        () => resolve(''),
+        timeout,
+      );
    }
-  }
+  });

-  cancelTimer () {
-    if (this._closeTimer != null) clearTimeout(this._closeTimer);
-  }
-
-  show (parent: Element): Promise<SnackShowResult> {
-    if (this._showing) return Promise.resolve(this._result);
-    this._showing = true;
-    this.cancelTimer();
-    if (parent !== this._element.parentNode) {
-      parent.appendChild(this._element);
-    }
-    this._element.removeAttribute('aria-hidden');
-    this._closeTimer = setTimeout(this.hide.bind(this), this._options.timeout || DEFAULT_TIMEOUT);
-    return new Promise((resolve) => {
-      this._onremove.push(resolve);
-    });
-  }
-
-  hide () {
-    if (!this._showing) return;
-    this._showing = false;
-    this.cancelTimer();
-    this._element.addEventListener('animationend', this.remove.bind(this));
-    this._element.setAttribute('aria-hidden', 'true');
-  }
-
-  remove () {
-    this.cancelTimer();
-    const parent = this._element.parentNode;
-    if (parent) parent.removeChild(this._element);
-    this._onremove.forEach(f => f(this._result));
-    this._onremove = [];
-  }
+  return [el, result];
 }

 export default class SnackBarElement extends HTMLElement {
-  private _snackbars: Snack[] = [];
-  private _processingStack = false;
+  private _snackbars: [string, SnackOptions, (action: Promise<string>) => void][] = [];
+  private _processingQueue = false;

-  showSnackbar (options: SnackOptions): Promise<SnackShowResult> {
-    return new Promise((resolve) => {
-      const snack = new Snack(options, resolve);
-      this._snackbars.push(snack);
-      this._processStack();
+  /**
+   * Show a snackbar. Returns a promise for the name of the action clicked, or an empty string if no
+   * action is clicked.
+   */
+  showSnackbar(message: string, options: SnackOptions = {}): Promise<string> {
+    return new Promise<string>((resolve) => {
+      this._snackbars.push([message, options, resolve]);
+      if (!this._processingQueue) this._processQueue();
    });
  }

-  private async _processStack () {
-    if (this._processingStack === true || this._snackbars.length === 0) return;
-    this._processingStack = true;
-    await this._snackbars[0].show(this);
-    this._snackbars.shift();
-    this._processingStack = false;
-    this._processStack();
+  private async _processQueue() {
+    this._processingQueue = true;
+
+    while (this._snackbars[0]) {
+      const [message, options, resolver] = this._snackbars[0];
+      const [el, result] = createSnack(message, options);
+      // Pass the result back to the original showSnackbar call.
+      resolver(result);
+      this.appendChild(el);
+
+      // Wait for the user to click an action, or for the snack to timeout.
+      await result;
+
+      // Transition the snack away.
+      el.setAttribute('aria-hidden', 'true');
+      await new Promise((resolve) => {
+        el.addEventListener('animationend', () => resolve());
+      });
+      el.remove();
+
+      this._snackbars.shift();
+    }
+
+    this._processingQueue = false;
  }
 }

--- a/src/lib/SnackBar/styles.css
+++ b/src/lib/SnackBar/styles.css
@@ -22,7 +22,6 @@ snack-bar {
  transform-origin: center;
  color: #eee;
  z-index: 100;
-  pointer-events: none;
  cursor: default;
  will-change: transform;
  animation: snackbar-show 300ms ease forwards 1;
@@ -53,13 +52,13 @@ snack-bar {
  }
 }

-.snackbar--text {
+.text {
  flex: 1 1 auto;
  padding: 16px;
  font-size: 100%;
 }

-.snackbar--button {
+.button {
  position: relative;
  flex: 0 1 auto;
  padding: 8px;
@@ -75,16 +74,15 @@ snack-bar {
  font-size: 100%;
  text-transform: uppercase;
  text-align: center;
-  pointer-events: all;
  cursor: pointer;
  overflow: hidden;
  transition: background-color 200ms ease;
  outline: none;
 }
-.snackbar--button:hover {
+.button:hover {
  background-color: rgba(0,0,0,0.15);
 }
-.snackbar--button:focus:before {
+.button:focus:before {
  content: '';
  position: absolute;
  left: 50%;
--- a/src/lib/icons.tsx
+++ b/src/lib/icons.tsx
@@ -41,3 +41,34 @@ export const CheckedIcon = (props: JSX.HTMLAttributes) => (
    <path d="M21.3 0H2.7A2.7 2.7 0 0 0 0 2.7v18.6A2.7 2.7 0 0 0 2.7 24h18.6a2.7 2.7 0 0 0 2.7-2.7V2.7A2.7 2.7 0 0 0 21.3 0zm-12 18.7L2.7 12l1.8-1.9L9.3 15 19.5 4.8l1.8 1.9z"/>
  </Icon>
 );
+
+export const ExpandIcon = (props: JSX.HTMLAttributes) => (
+  <Icon {...props}>
+    <path d="M16.6 8.6L12 13.2 7.4 8.6 6 10l6 6 6-6z"/>
+  </Icon>
+);
+
+const copyAcrossRotations = {
+  up: 90, right: 180, down: -90, left: 0,
+};
+
+export interface CopyAcrossIconProps extends JSX.HTMLAttributes {
+  copyDirection: keyof typeof copyAcrossRotations;
+}
+
+export const CopyAcrossIcon = (props: CopyAcrossIconProps) => {
+  const { copyDirection, ...otherProps } = props;
+  const id = 'point-' + copyDirection;
+  const rotation = copyAcrossRotations[copyDirection];
+
+  return (
+    <Icon {...otherProps}>
+      <defs>
+        <clipPath id={id}>
+          <path d="M-12-12v24h24v-24zM4.5 2h-4v3l-5-5 5-5v3h4z" transform={`translate(12 13) rotate(${rotation})`}/>
+        </clipPath>
+      </defs>
+      <path clip-path={`url(#${id})`} d="M19 3h-4.2c-.4-1.2-1.5-2-2.8-2s-2.4.8-2.8 2H5a2 2 0 0 0-2 2v14c0 1.1.9 2 2 2h14a2 2 0 0 0 2-2V5a2 2 0 0 0-2-2zm-7 0a1 1 0 0 1 0 2c-.6 0-1-.4-1-1s.4-1 1-1z"/>
+    </Icon>
+  );
+};
--- a/src/lib/util.ts
+++ b/src/lib/util.ts
@@ -258,3 +258,43 @@ export function konami(): Promise<void> {
    window.addEventListener('keydown', listener);
  });
 }
+
+interface TransitionOptions {
+  from?: number;
+  to?: number;
+  duration?: number;
+  easing?: string;
+}
+
+export async function transitionHeight(el: HTMLElement, opts: TransitionOptions): Promise<void> {
+  const {
+    from = el.getBoundingClientRect().height,
+    to = el.getBoundingClientRect().height,
+    duration = 1000,
+    easing = 'ease-in-out',
+  } = opts;
+
+  if (from === to || duration === 0) {
+    el.style.height = to + 'px';
+    return;
+  }
+
+  el.style.height = from + 'px';
+  // Force a style calc so the browser picks up the start value.
+  getComputedStyle(el).transform;
+  el.style.transition = `height ${duration}ms ${easing}`;
+  el.style.height = to + 'px';
+
+  return new Promise<void>((resolve) => {
+    const listener = (event: Event) => {
+      if (event.target !== el) return;
+      el.style.transition = '';
+      el.removeEventListener('transitionend', listener);
+      el.removeEventListener('transitioncancel', listener);
+      resolve();
+    };
+
+    el.addEventListener('transitionend', listener);
+    el.addEventListener('transitioncancel', listener);
+  });
+}
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -25,6 +25,7 @@ module.exports = function (_, env) {
    path.join(__dirname, 'src/components'),
    path.join(__dirname, 'src/codecs'),
    path.join(__dirname, 'src/custom-els'),
+    path.join(__dirname, 'src/lib'),
  ];

  return {
@@ -107,7 +108,7 @@ module.exports = function (_, env) {
              loader: 'typings-for-css-modules-loader',
              options: {
                modules: true,
-                localIdentName: '[local]__[hash:base64:5]',
+                localIdentName: isProd ? '[hash:base64:5]' : '[local]__[hash:base64:5]',
                namedExport: true,
                camelCase: true,
                importLoaders: 1,
@@ -199,8 +200,11 @@ module.exports = function (_, env) {

      new OptimizeCssAssetsPlugin({
        cssProcessorOptions: {
-          zindex: false,
-          discardComments: { removeAll: true }
+          postcssReduceIdents: {
+            counterStyle: false,
+            gridTemplate: false,
+            keyframes: false
+          }
        }
      }),
Author	SHA1	Message	Date
Jake Archibald	150e704d20	It's a dev package	2018-11-06 13:50:50 +00:00
Paul Kinlan	b2d47f0fb8	fixing a deps issue.	2018-11-06 13:50:49 +00:00
Paul Kinlan	bd3d33296d	Updating based on changes to filedrop element.	2018-11-06 13:50:49 +00:00
Paul Kinlan	f4c82ced97	#199 - Removes the file-drop custom element + Removes the custom element from the project + Replaces it with the externally maintined custom element	2018-11-06 13:50:48 +00:00
Jake Archibald	76188df0d3	Destructuring args.	2018-11-06 13:47:18 +00:00
Jake Archibald	9a58e4d339	Fixing lossless slider for webP. Previously you couldn't select "9" :D	2018-11-06 13:47:18 +00:00
Jake Archibald	f396a5b784	MozJPEG chroma subsampling and quality (#235 ) * Adding chroma subsampling for mozjpeg * Adding separate chroma quality. * Preact sometimes removes the inline styles, this fixes it. * Simplifying chroma subsample * Adding comments	2018-11-06 13:46:52 +00:00
Jake Archibald	e572b853e2	Snackbar defaults & copy undo (#233 ) * Fix snackbar defaults. Fixes #205. * Undo copy settings across. * Oops * Fixing stupid minification bug * Something weird happened with the last commit	2018-11-06 13:44:15 +00:00
Jake Archibald	726c2f195a	Fixing graphics glitch. Fixes #166 (#232 )	2018-11-06 13:41:08 +00:00
Jake Archibald	4599e51b1e	Copy to side ui (#229 ) * Copy settings to other side button * Download button on the outside. * Whoops	2018-11-06 13:39:03 +00:00
Jake Archibald	d93169cc5a	Mobile ui (#227 ) * Basic grid setup * Fixing thumb on two-up * Adding margin so you can still access the two-up * Allow multi-panel to keep one open only * Edge cases for one-open * Abstracting results so it can be used as a heading. * Ordering of items in mobile view. Changing scrolling element. * Adding labels to collapsed view * Adding height animation to multi-panel * Fixing animation bugs * Expand/collapse icon * Allow two-up and pinch-zoom to work beneath controls * Range bubble now behaves properly on mobile * No longer need this. * Prevent options overflow at larger widths	2018-11-06 13:37:52 +00:00