Merge branch 'dev' into basis

Turns out TypeScript is there for a reason and shouldn't be bypassed. Fixes #1135

cli/src/index.js

@@ -75,7 +75,9 @@ async function getInputFiles(paths) {
 
   for (const inputPath of paths) {
     const files = (await fsp.lstat(inputPath)).isDirectory()
-      ? (await fsp.readdir(inputPath, {withFileTypes: true})).filter(dirent => dirent.isFile()).map(dirent => path.join(inputPath, dirent.name))
+      ? (await fsp.readdir(inputPath, { withFileTypes: true }))
+          .filter((dirent) => dirent.isFile())
+          .map((dirent) => path.join(inputPath, dirent.name))
       : [inputPath];
     for (const file of files) {
       try {

codecs/basis/LICENSE.codec.md

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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codecs/basis/Makefile

@@ -0,0 +1,83 @@
+CODEC_URL := https://github.com/BinomialLLC/basis_universal/archive/refs/tags/v1.15_rel2.tar.gz
+CODEC_DIR := node_modules/basis
+CODEC_BUILD_DIR := $(CODEC_DIR)/build
+CODEC_LIB := $(CODEC_BUILD_DIR)/basis.a
+ENVIRONMENT = worker
+
+OUT_JS := enc/basis_enc.js dec/basis_dec.js
+OUT_WASM := $(OUT_JS:.js=.wasm)
+
+COMMON_FLAGS := -O3 -fno-strict-aliasing
+
+override 	CXXFLAGS += $(COMMON_FLAGS)
+override 	CFLAGS += $(COMMAN_FLAGS)
+
+CODEC_CPP_SOURCE_FILES := \
+	encoder/basisu_comp.cpp \
+	encoder/basisu_enc.cpp \
+	encoder/basisu_backend.cpp \
+	encoder/basisu_basis_file.cpp \
+	encoder/basisu_etc.cpp \
+	encoder/basisu_uastc_enc.cpp \
+	encoder/basisu_gpu_texture.cpp \
+	encoder/basisu_frontend.cpp \
+	encoder/basisu_bc7enc.cpp \
+	encoder/basisu_pvrtc1_4.cpp \
+	encoder/basisu_astc_decomp.cpp \
+	encoder/basisu_global_selector_palette_helpers.cpp \
+	encoder/basisu_resampler.cpp \
+	encoder/basisu_kernels_sse.cpp \
+	encoder/basisu_resample_filters.cpp \
+	encoder/jpgd.cpp \
+	encoder/lodepng.cpp \
+	transcoder/basisu_transcoder.cpp
+
+CODEC_C_SOURCE_FILES := \
+	encoder/apg_bmp.c \
+	zstd/zstd.c
+
+.PHONY: all clean
+
+all: $(CODEC_DIR) $(OUT_JS)
+
+# Define dependencies for all variations of build artifacts.
+$(filter enc/%,$(OUT_JS)): enc/basis_enc.cpp
+$(filter dec/%,$(OUT_JS)): dec/basis_dec.cpp
+
+# TODO: Make it build for node
+# enc/mozjpeg_node_enc.js dec/mozjpeg_node_dec.js: ENVIRONMENT = node
+
+%.js: $(CODEC_LIB)
+	$(CXX) \
+		-I $(CODEC_DIR)/encoder \
+		-I $(CODEC_DIR)/transcoder \
+		${CXXFLAGS} \
+		${LDFLAGS} \
+		--closure 1 \
+		--bind \
+		-s ALLOW_MEMORY_GROWTH=1 \
+		-s MODULARIZE=1 \
+		-s TEXTDECODER=2 \
+		-s ENVIRONMENT=$(ENVIRONMENT) \
+		-s EXPORT_ES6=1 \
+		-o $@ \
+		$+ 
+
+$(CODEC_LIB): $(CODEC_DIR)
+	mkdir -p $(CODEC_BUILD_DIR)
+	cd $(CODEC_BUILD_DIR) && \
+	$(CXX) \
+		${CXXFLAGS} \
+		-c $(addprefix ../, $(CODEC_CPP_SOURCE_FILES))
+	cd $(CODEC_BUILD_DIR) && \
+	$(CC) \
+		${CFLAGS} \
+		-c $(addprefix ../, $(CODEC_C_SOURCE_FILES))
+	$(AR) rc $(CODEC_LIB) $(CODEC_BUILD_DIR)/*.o
+
+$(CODEC_DIR):
+	mkdir -p $@
+	curl -sL $(CODEC_URL) | tar xz --strip 1 -C $@
+
+clean:
+	$(RM) -r $(OUT_JS) $(OUT_WASM) $(CODEC_BUILD_DIR)

codecs/basis/dec/basis_dec.cpp

@@ -0,0 +1,46 @@
+#include <emscripten/bind.h>
+#include <emscripten/val.h>
+#include <inttypes.h>
+#include <string>
+#include "basisu_global_selector_palette.h"
+#include "basisu_transcoder.h"
+
+using namespace emscripten;
+using namespace basisu;
+
+thread_local const val Uint8ClampedArray = val::global("Uint8ClampedArray");
+thread_local const val ImageData = val::global("ImageData");
+
+val decode(std::string data) {
+  basist::basisu_transcoder_init();
+
+  basist::etc1_global_selector_codebook sel_codebook = basist::etc1_global_selector_codebook(
+      basist::g_global_selector_cb_size, basist::g_global_selector_cb);
+  basist::ktx2_transcoder transcoder = basist::ktx2_transcoder(&sel_codebook);
+
+  const void* dataPtr = reinterpret_cast<const void*>(data.c_str());
+  auto dataSize = data.size();
+  transcoder.init(dataPtr, dataSize);
+
+  auto header = transcoder.get_header();
+  auto image_width = static_cast<uint32_t>(header.m_pixel_width);
+  auto image_height = static_cast<uint32_t>(header.m_pixel_height);
+
+  transcoder.start_transcoding();
+  auto buffer = std::vector<uint8_t>(image_width * image_height * 4);
+  auto ok = transcoder.transcode_image_level(
+      0 /* level_index */, 0 /* layer_index */, 0 /* face_index */, buffer.data(),
+      buffer.size() / 4, basist::transcoder_texture_format::cTFRGBA32, 0 /* decode_flags */,
+      image_width /* output_row_pitch_in_blocks_or_pixels */);
+  if (!ok) {
+    return val(std::string("Could not decode"));
+  }
+
+  auto img_data_data = Uint8ClampedArray.new_(typed_memory_view(buffer.size(), buffer.data()));
+  auto imgData = ImageData.new_(img_data_data, image_width, image_height);
+  return imgData;
+}
+
+EMSCRIPTEN_BINDINGS(my_module) {
+  function("decode", &decode);
+}

codecs/basis/dec/basis_dec.d.ts

@@ -0,0 +1,7 @@
+export interface BasisModule extends EmscriptenWasm.Module {
+  decode(data: BufferSource): ImageData | null;
+}
+
+declare var moduleFactory: EmscriptenWasm.ModuleFactory<BasisModule>;
+
+export default moduleFactory;

codecs/basis/dec/basis_dec.js

@@ -0,0 +1,56 @@
+
+var Module = (function() {
+  var _scriptDir = import.meta.url;
+  
+  return (
+function(Module) {
+  Module = Module || {};
+
+
+var e;e||(e=typeof Module !== 'undefined' ? Module : {});var aa,r;e.ready=new Promise(function(a,b){aa=a;r=b});var t={},u;for(u in e)e.hasOwnProperty(u)&&(t[u]=e[u]);var v="",w;v=self.location.href;_scriptDir&&(v=_scriptDir);0!==v.indexOf("blob:")?v=v.substr(0,v.lastIndexOf("/")+1):v="";w=function(a){var b=new XMLHttpRequest;b.open("GET",a,!1);b.responseType="arraybuffer";b.send(null);return new Uint8Array(b.response)};var ba=e.print||console.log.bind(console),y=e.printErr||console.warn.bind(console);
+for(u in t)t.hasOwnProperty(u)&&(e[u]=t[u]);t=null;var z;e.wasmBinary&&(z=e.wasmBinary);var noExitRuntime=e.noExitRuntime||!0;"object"!==typeof WebAssembly&&A("no native wasm support detected");var C,ca=!1,da=new TextDecoder("utf8");function D(a,b){if(!a)return"";b=a+b;for(var c=a;!(c>=b)&&E[c];)++c;return da.decode(E.subarray(a,c))}
+function ea(a,b,c){var d=E;if(0<c){c=b+c-1;for(var f=0;f<a.length;++f){var g=a.charCodeAt(f);if(55296<=g&&57343>=g){var k=a.charCodeAt(++f);g=65536+((g&1023)<<10)|k&1023}if(127>=g){if(b>=c)break;d[b++]=g}else{if(2047>=g){if(b+1>=c)break;d[b++]=192|g>>6}else{if(65535>=g){if(b+2>=c)break;d[b++]=224|g>>12}else{if(b+3>=c)break;d[b++]=240|g>>18;d[b++]=128|g>>12&63}d[b++]=128|g>>6&63}d[b++]=128|g&63}}d[b]=0}}var fa=new TextDecoder("utf-16le");
+function ha(a,b){var c=a>>1;for(b=c+b/2;!(c>=b)&&F[c];)++c;return fa.decode(E.subarray(a,c<<1))}function ia(a,b,c){void 0===c&&(c=2147483647);if(2>c)return 0;c-=2;var d=b;c=c<2*a.length?c/2:a.length;for(var f=0;f<c;++f)G[b>>1]=a.charCodeAt(f),b+=2;G[b>>1]=0;return b-d}function ja(a){return 2*a.length}function ka(a,b){for(var c=0,d="";!(c>=b/4);){var f=I[a+4*c>>2];if(0==f)break;++c;65536<=f?(f-=65536,d+=String.fromCharCode(55296|f>>10,56320|f&1023)):d+=String.fromCharCode(f)}return d}
+function la(a,b,c){void 0===c&&(c=2147483647);if(4>c)return 0;var d=b;c=d+c-4;for(var f=0;f<a.length;++f){var g=a.charCodeAt(f);if(55296<=g&&57343>=g){var k=a.charCodeAt(++f);g=65536+((g&1023)<<10)|k&1023}I[b>>2]=g;b+=4;if(b+4>c)break}I[b>>2]=0;return b-d}function ma(a){for(var b=0,c=0;c<a.length;++c){var d=a.charCodeAt(c);55296<=d&&57343>=d&&++c;b+=4}return b}var na,oa,E,G,F,I,J,pa,qa;
+function ra(){var a=C.buffer;na=a;e.HEAP8=oa=new Int8Array(a);e.HEAP16=G=new Int16Array(a);e.HEAP32=I=new Int32Array(a);e.HEAPU8=E=new Uint8Array(a);e.HEAPU16=F=new Uint16Array(a);e.HEAPU32=J=new Uint32Array(a);e.HEAPF32=pa=new Float32Array(a);e.HEAPF64=qa=new Float64Array(a)}var L,sa=[],ta=[],ua=[];function va(){var a=e.preRun.shift();sa.unshift(a)}var M=0,wa=null,N=null;e.preloadedImages={};e.preloadedAudios={};
+function A(a){if(e.onAbort)e.onAbort(a);y(a);ca=!0;a=new WebAssembly.RuntimeError("abort("+a+"). Build with -s ASSERTIONS=1 for more info.");r(a);throw a;}var O=(new URL("basis_dec.wasm",import.meta.url)).toString();function xa(){try{if(O==O&&z)return new Uint8Array(z);if(w)return w(O);throw"both async and sync fetching of the wasm failed";}catch(a){A(a)}}
+function ya(){return z||"function"!==typeof fetch?Promise.resolve().then(function(){return xa()}):fetch(O,{credentials:"same-origin"}).then(function(a){if(!a.ok)throw"failed to load wasm binary file at '"+O+"'";return a.arrayBuffer()}).catch(function(){return xa()})}function za(a){for(;0<a.length;){var b=a.shift();if("function"==typeof b)b(e);else{var c=b.M;"number"===typeof c?void 0===b.I?L.get(c)():L.get(c)(b.I):c(void 0===b.I?null:b.I)}}}
+function Aa(a){switch(a){case 1:return 0;case 2:return 1;case 4:return 2;case 8:return 3;default:throw new TypeError("Unknown type size: "+a);}}var Ba=void 0;function P(a){for(var b="";E[a];)b+=Ba[E[a++]];return b}var Q={},R={},S={};function Ca(a){if(void 0===a)return"_unknown";a=a.replace(/[^a-zA-Z0-9_]/g,"$");var b=a.charCodeAt(0);return 48<=b&&57>=b?"_"+a:a}
+function Da(a,b){a=Ca(a);return(new Function("body","return function "+a+'() {\n    "use strict";    return body.apply(this, arguments);\n};\n'))(b)}function Ea(a){var b=Error,c=Da(a,function(d){this.name=a;this.message=d;d=Error(d).stack;void 0!==d&&(this.stack=this.toString()+"\n"+d.replace(/^Error(:[^\n]*)?\n/,""))});c.prototype=Object.create(b.prototype);c.prototype.constructor=c;c.prototype.toString=function(){return void 0===this.message?this.name:this.name+": "+this.message};return c}
+var Fa=void 0;function T(a){throw new Fa(a);}var Ga=void 0;function Ha(a,b){function c(h){h=b(h);if(h.length!==d.length)throw new Ga("Mismatched type converter count");for(var m=0;m<d.length;++m)U(d[m],h[m])}var d=[];d.forEach(function(h){S[h]=a});var f=Array(a.length),g=[],k=0;a.forEach(function(h,m){R.hasOwnProperty(h)?f[m]=R[h]:(g.push(h),Q.hasOwnProperty(h)||(Q[h]=[]),Q[h].push(function(){f[m]=R[h];++k;k===g.length&&c(f)}))});0===g.length&&c(f)}
+function U(a,b,c){c=c||{};if(!("argPackAdvance"in b))throw new TypeError("registerType registeredInstance requires argPackAdvance");var d=b.name;a||T('type "'+d+'" must have a positive integer typeid pointer');if(R.hasOwnProperty(a)){if(c.L)return;T("Cannot register type '"+d+"' twice")}R[a]=b;delete S[a];Q.hasOwnProperty(a)&&(b=Q[a],delete Q[a],b.forEach(function(f){f()}))}var Ia=[],V=[{},{value:void 0},{value:null},{value:!0},{value:!1}];
+function La(a){4<a&&0===--V[a].J&&(V[a]=void 0,Ia.push(a))}function W(a){switch(a){case void 0:return 1;case null:return 2;case !0:return 3;case !1:return 4;default:var b=Ia.length?Ia.pop():V.length;V[b]={J:1,value:a};return b}}function Ma(a){return this.fromWireType(J[a>>2])}function Na(a){if(null===a)return"null";var b=typeof a;return"object"===b||"array"===b||"function"===b?a.toString():""+a}
+function Oa(a,b){switch(b){case 2:return function(c){return this.fromWireType(pa[c>>2])};case 3:return function(c){return this.fromWireType(qa[c>>3])};default:throw new TypeError("Unknown float type: "+a);}}function Pa(a){var b=Function;if(!(b instanceof Function))throw new TypeError("new_ called with constructor type "+typeof b+" which is not a function");var c=Da(b.name||"unknownFunctionName",function(){});c.prototype=b.prototype;c=new c;a=b.apply(c,a);return a instanceof Object?a:c}
+function Qa(a){for(;a.length;){var b=a.pop();a.pop()(b)}}function Ra(a,b){var c=e;if(void 0===c[a].G){var d=c[a];c[a]=function(){c[a].G.hasOwnProperty(arguments.length)||T("Function '"+b+"' called with an invalid number of arguments ("+arguments.length+") - expects one of ("+c[a].G+")!");return c[a].G[arguments.length].apply(this,arguments)};c[a].G=[];c[a].G[d.K]=d}}
+function Sa(a,b,c){e.hasOwnProperty(a)?((void 0===c||void 0!==e[a].G&&void 0!==e[a].G[c])&&T("Cannot register public name '"+a+"' twice"),Ra(a,a),e.hasOwnProperty(c)&&T("Cannot register multiple overloads of a function with the same number of arguments ("+c+")!"),e[a].G[c]=b):(e[a]=b,void 0!==c&&(e[a].O=c))}function Ta(a,b){for(var c=[],d=0;d<a;d++)c.push(I[(b>>2)+d]);return c}
+function Ua(a,b){var c=[];return function(){c.length=arguments.length;for(var d=0;d<arguments.length;d++)c[d]=arguments[d];a.includes("j")?(d=e["dynCall_"+a],d=c&&c.length?d.apply(null,[b].concat(c)):d.call(null,b)):d=L.get(b).apply(null,c);return d}}function Va(a,b){a=P(a);var c=a.includes("j")?Ua(a,b):L.get(b);"function"!==typeof c&&T("unknown function pointer with signature "+a+": "+b);return c}var Wa=void 0;function Xa(a){a=Ya(a);var b=P(a);X(a);return b}
+function Za(a,b){function c(g){f[g]||R[g]||(S[g]?S[g].forEach(c):(d.push(g),f[g]=!0))}var d=[],f={};b.forEach(c);throw new Wa(a+": "+d.map(Xa).join([", "]));}function $a(a,b,c){switch(b){case 0:return c?function(d){return oa[d]}:function(d){return E[d]};case 1:return c?function(d){return G[d>>1]}:function(d){return F[d>>1]};case 2:return c?function(d){return I[d>>2]}:function(d){return J[d>>2]};default:throw new TypeError("Unknown integer type: "+a);}}var ab={};
+function bb(){return"object"===typeof globalThis?globalThis:Function("return this")()}function cb(a,b){var c=R[a];void 0===c&&T(b+" has unknown type "+Xa(a));return c}for(var db={},eb=[null,[],[]],fb=Array(256),Y=0;256>Y;++Y)fb[Y]=String.fromCharCode(Y);Ba=fb;Fa=e.BindingError=Ea("BindingError");Ga=e.InternalError=Ea("InternalError");e.count_emval_handles=function(){for(var a=0,b=5;b<V.length;++b)void 0!==V[b]&&++a;return a};
+e.get_first_emval=function(){for(var a=5;a<V.length;++a)if(void 0!==V[a])return V[a];return null};Wa=e.UnboundTypeError=Ea("UnboundTypeError");
+var hb={a:function(a,b,c,d){A("Assertion failed: "+D(a)+", at: "+[b?D(b):"unknown filename",c,d?D(d):"unknown function"])},g:function(){},r:function(){},x:function(a,b,c,d,f){var g=Aa(c);b=P(b);U(a,{name:b,fromWireType:function(k){return!!k},toWireType:function(k,h){return h?d:f},argPackAdvance:8,readValueFromPointer:function(k){if(1===c)var h=oa;else if(2===c)h=G;else if(4===c)h=I;else throw new TypeError("Unknown boolean type size: "+b);return this.fromWireType(h[k>>g])},H:null})},w:function(a,
+b){b=P(b);U(a,{name:b,fromWireType:function(c){var d=V[c].value;La(c);return d},toWireType:function(c,d){return W(d)},argPackAdvance:8,readValueFromPointer:Ma,H:null})},l:function(a,b,c){c=Aa(c);b=P(b);U(a,{name:b,fromWireType:function(d){return d},toWireType:function(d,f){if("number"!==typeof f&&"boolean"!==typeof f)throw new TypeError('Cannot convert "'+Na(f)+'" to '+this.name);return f},argPackAdvance:8,readValueFromPointer:Oa(b,c),H:null})},o:function(a,b,c,d,f,g){var k=Ta(b,c);a=P(a);f=Va(d,
+f);Sa(a,function(){Za("Cannot call "+a+" due to unbound types",k)},b-1);Ha(k,function(h){var m=a,l=a;h=[h[0],null].concat(h.slice(1));var p=f,q=h.length;2>q&&T("argTypes array size mismatch! Must at least get return value and 'this' types!");for(var x=null!==h[1]&&!1,B=!1,n=1;n<h.length;++n)if(null!==h[n]&&void 0===h[n].H){B=!0;break}var Ja="void"!==h[0].name,H="",K="";for(n=0;n<q-2;++n)H+=(0!==n?", ":"")+"arg"+n,K+=(0!==n?", ":"")+"arg"+n+"Wired";l="return function "+Ca(l)+"("+H+") {\nif (arguments.length !== "+
+(q-2)+") {\nthrowBindingError('function "+l+" called with ' + arguments.length + ' arguments, expected "+(q-2)+" args!');\n}\n";B&&(l+="var destructors = [];\n");var Ka=B?"destructors":"null";H="throwBindingError invoker fn runDestructors retType classParam".split(" ");p=[T,p,g,Qa,h[0],h[1]];x&&(l+="var thisWired = classParam.toWireType("+Ka+", this);\n");for(n=0;n<q-2;++n)l+="var arg"+n+"Wired = argType"+n+".toWireType("+Ka+", arg"+n+"); // "+h[n+2].name+"\n",H.push("argType"+n),p.push(h[n+2]);x&&
+(K="thisWired"+(0<K.length?", ":"")+K);l+=(Ja?"var rv = ":"")+"invoker(fn"+(0<K.length?", ":"")+K+");\n";if(B)l+="runDestructors(destructors);\n";else for(n=x?1:2;n<h.length;++n)q=1===n?"thisWired":"arg"+(n-2)+"Wired",null!==h[n].H&&(l+=q+"_dtor("+q+"); // "+h[n].name+"\n",H.push(q+"_dtor"),p.push(h[n].H));Ja&&(l+="var ret = retType.fromWireType(rv);\nreturn ret;\n");H.push(l+"}\n");h=Pa(H).apply(null,p);n=b-1;if(!e.hasOwnProperty(m))throw new Ga("Replacing nonexistant public symbol");void 0!==e[m].G&&
+void 0!==n?e[m].G[n]=h:(e[m]=h,e[m].K=n);return[]})},c:function(a,b,c,d,f){function g(l){return l}b=P(b);-1===f&&(f=4294967295);var k=Aa(c);if(0===d){var h=32-8*c;g=function(l){return l<<h>>>h}}var m=b.includes("unsigned");U(a,{name:b,fromWireType:g,toWireType:function(l,p){if("number"!==typeof p&&"boolean"!==typeof p)throw new TypeError('Cannot convert "'+Na(p)+'" to '+this.name);if(p<d||p>f)throw new TypeError('Passing a number "'+Na(p)+'" from JS side to C/C++ side to an argument of type "'+b+
+'", which is outside the valid range ['+d+", "+f+"]!");return m?p>>>0:p|0},argPackAdvance:8,readValueFromPointer:$a(b,k,0!==d),H:null})},b:function(a,b,c){function d(g){g>>=2;var k=J;return new f(na,k[g+1],k[g])}var f=[Int8Array,Uint8Array,Int16Array,Uint16Array,Int32Array,Uint32Array,Float32Array,Float64Array][b];c=P(c);U(a,{name:c,fromWireType:d,argPackAdvance:8,readValueFromPointer:d},{L:!0})},m:function(a,b){b=P(b);var c="std::string"===b;U(a,{name:b,fromWireType:function(d){var f=J[d>>2];if(c)for(var g=
+d+4,k=0;k<=f;++k){var h=d+4+k;if(k==f||0==E[h]){g=D(g,h-g);if(void 0===m)var m=g;else m+=String.fromCharCode(0),m+=g;g=h+1}}else{m=Array(f);for(k=0;k<f;++k)m[k]=String.fromCharCode(E[d+4+k]);m=m.join("")}X(d);return m},toWireType:function(d,f){f instanceof ArrayBuffer&&(f=new Uint8Array(f));var g="string"===typeof f;g||f instanceof Uint8Array||f instanceof Uint8ClampedArray||f instanceof Int8Array||T("Cannot pass non-string to std::string");var k=(c&&g?function(){for(var l=0,p=0;p<f.length;++p){var q=
+f.charCodeAt(p);55296<=q&&57343>=q&&(q=65536+((q&1023)<<10)|f.charCodeAt(++p)&1023);127>=q?++l:l=2047>=q?l+2:65535>=q?l+3:l+4}return l}:function(){return f.length})(),h=gb(4+k+1);J[h>>2]=k;if(c&&g)ea(f,h+4,k+1);else if(g)for(g=0;g<k;++g){var m=f.charCodeAt(g);255<m&&(X(h),T("String has UTF-16 code units that do not fit in 8 bits"));E[h+4+g]=m}else for(g=0;g<k;++g)E[h+4+g]=f[g];null!==d&&d.push(X,h);return h},argPackAdvance:8,readValueFromPointer:Ma,H:function(d){X(d)}})},i:function(a,b,c){c=P(c);
+if(2===b){var d=ha;var f=ia;var g=ja;var k=function(){return F};var h=1}else 4===b&&(d=ka,f=la,g=ma,k=function(){return J},h=2);U(a,{name:c,fromWireType:function(m){for(var l=J[m>>2],p=k(),q,x=m+4,B=0;B<=l;++B){var n=m+4+B*b;if(B==l||0==p[n>>h])x=d(x,n-x),void 0===q?q=x:(q+=String.fromCharCode(0),q+=x),x=n+b}X(m);return q},toWireType:function(m,l){"string"!==typeof l&&T("Cannot pass non-string to C++ string type "+c);var p=g(l),q=gb(4+p+b);J[q>>2]=p>>h;f(l,q+4,p+b);null!==m&&m.push(X,q);return q},
+argPackAdvance:8,readValueFromPointer:Ma,H:function(m){X(m)}})},n:function(a,b){b=P(b);U(a,{N:!0,name:b,argPackAdvance:0,fromWireType:function(){},toWireType:function(){}})},e:La,f:function(a){if(0===a)return W(bb());var b=ab[a];a=void 0===b?P(a):b;return W(bb()[a])},j:function(a){4<a&&(V[a].J+=1)},k:function(a,b,c,d){a||T("Cannot use deleted val. handle = "+a);a=V[a].value;var f=db[b];if(!f){f="";for(var g=0;g<b;++g)f+=(0!==g?", ":"")+"arg"+g;var k="return function emval_allocator_"+b+"(constructor, argTypes, args) {\n";
+for(g=0;g<b;++g)k+="var argType"+g+" = requireRegisteredType(Module['HEAP32'][(argTypes >>> 2) + "+g+'], "parameter '+g+'");\nvar arg'+g+" = argType"+g+".readValueFromPointer(args);\nargs += argType"+g+"['argPackAdvance'];\n";f=(new Function("requireRegisteredType","Module","__emval_register",k+("var obj = new constructor("+f+");\nreturn __emval_register(obj);\n}\n")))(cb,e,W);db[b]=f}return f(a,c,d)},p:function(a,b){a=cb(a,"_emval_take_value");a=a.readValueFromPointer(b);return W(a)},d:function(){A()},
+t:function(a,b,c){E.copyWithin(a,b,b+c)},h:function(a){var b=E.length;a>>>=0;if(2147483648<a)return!1;for(var c=1;4>=c;c*=2){var d=b*(1+.2/c);d=Math.min(d,a+100663296);d=Math.max(a,d);0<d%65536&&(d+=65536-d%65536);a:{try{C.grow(Math.min(2147483648,d)-na.byteLength+65535>>>16);ra();var f=1;break a}catch(g){}f=void 0}if(f)return!0}return!1},v:function(){return 0},q:function(){},u:function(a,b,c,d){for(var f=0,g=0;g<c;g++){for(var k=I[b+8*g>>2],h=I[b+(8*g+4)>>2],m=0;m<h;m++){var l=E[k+m],p=eb[a];if(0===
+l||10===l){for(l=0;p[l]&&!(NaN<=l);)++l;l=da.decode(p.subarray?p.subarray(0,l):new Uint8Array(p.slice(0,l)));(1===a?ba:y)(l);p.length=0}else p.push(l)}f+=h}I[d>>2]=f;return 0},s:function(){}};
+(function(){function a(f){e.asm=f.exports;C=e.asm.y;ra();L=e.asm.E;ta.unshift(e.asm.z);M--;e.monitorRunDependencies&&e.monitorRunDependencies(M);0==M&&(null!==wa&&(clearInterval(wa),wa=null),N&&(f=N,N=null,f()))}function b(f){a(f.instance)}function c(f){return ya().then(function(g){return WebAssembly.instantiate(g,d)}).then(f,function(g){y("failed to asynchronously prepare wasm: "+g);A(g)})}var d={a:hb};M++;e.monitorRunDependencies&&e.monitorRunDependencies(M);if(e.instantiateWasm)try{return e.instantiateWasm(d,
+a)}catch(f){return y("Module.instantiateWasm callback failed with error: "+f),!1}(function(){return z||"function"!==typeof WebAssembly.instantiateStreaming||O.startsWith("data:application/octet-stream;base64,")||"function"!==typeof fetch?c(b):fetch(O,{credentials:"same-origin"}).then(function(f){return WebAssembly.instantiateStreaming(f,d).then(b,function(g){y("wasm streaming compile failed: "+g);y("falling back to ArrayBuffer instantiation");return c(b)})})})().catch(r);return{}})();
+e.___wasm_call_ctors=function(){return(e.___wasm_call_ctors=e.asm.z).apply(null,arguments)};var gb=e._malloc=function(){return(gb=e._malloc=e.asm.A).apply(null,arguments)},X=e._free=function(){return(X=e._free=e.asm.B).apply(null,arguments)},Ya=e.___getTypeName=function(){return(Ya=e.___getTypeName=e.asm.C).apply(null,arguments)};e.___embind_register_native_and_builtin_types=function(){return(e.___embind_register_native_and_builtin_types=e.asm.D).apply(null,arguments)};
+e.dynCall_jiji=function(){return(e.dynCall_jiji=e.asm.F).apply(null,arguments)};var Z;N=function ib(){Z||jb();Z||(N=ib)};
+function jb(){function a(){if(!Z&&(Z=!0,e.calledRun=!0,!ca)){za(ta);aa(e);if(e.onRuntimeInitialized)e.onRuntimeInitialized();if(e.postRun)for("function"==typeof e.postRun&&(e.postRun=[e.postRun]);e.postRun.length;){var b=e.postRun.shift();ua.unshift(b)}za(ua)}}if(!(0<M)){if(e.preRun)for("function"==typeof e.preRun&&(e.preRun=[e.preRun]);e.preRun.length;)va();za(sa);0<M||(e.setStatus?(e.setStatus("Running..."),setTimeout(function(){setTimeout(function(){e.setStatus("")},1);a()},1)):a())}}e.run=jb;
+if(e.preInit)for("function"==typeof e.preInit&&(e.preInit=[e.preInit]);0<e.preInit.length;)e.preInit.pop()();jb();
+
+
+  return Module.ready
+}
+);
+})();
+export default Module;

codecs/basis/enc/basis_enc.cpp

@@ -0,0 +1,96 @@
+#include <emscripten/bind.h>
+#include <emscripten/val.h>
+#include <inttypes.h>
+#include "basisu_comp.h"
+#include "basisu_enc.h"
+
+using namespace emscripten;
+using namespace basisu;
+
+struct BasisOptions {
+  float quality;
+  uint8_t compression;
+  bool uastc;
+  bool mipmap;
+  bool srgb_mipmap;
+  std::string mipmap_filter;
+  bool perceptual;
+  bool y_flip;
+  uint32_t mipmap_min_dimension;
+};
+
+thread_local const val Uint8Array = val::global("Uint8Array");
+
+val encode(std::string image_in, int image_width, int image_height, BasisOptions opts) {
+  basisu_encoder_init();
+
+  basist::etc1_global_selector_codebook sel_codebook(basist::g_global_selector_cb_size,
+                                                     basist::g_global_selector_cb);
+  basis_compressor_params params;
+  basis_compressor compressor;
+  image img =
+      image(reinterpret_cast<const uint8_t*>(image_in.c_str()), image_width, image_height, 4);
+  // We don’t need the encoder to read/decode files from the filesystem
+  params.m_read_source_images = false;
+  // Writing is unnecessary, too
+  params.m_write_output_basis_files = false;
+  // No printf pls
+  params.m_status_output = false;
+  // True => UASTC, False => ETC1S
+  params.m_uastc = opts.uastc;
+  // Use the standardized KTX2 format
+  params.m_create_ktx2_file = true;
+  // Codebook, whatever this exactly is or does.
+  params.m_pSel_codebook = &sel_codebook;
+  // No multithreading. It apparently doesn’t work well in Wasm.
+  // But we still need to provide a job pool.
+  params.m_multithreading = false;
+  job_pool jpool(1);
+  params.m_pJob_pool = &jpool;
+
+  params.m_ktx2_uastc_supercompression = basist::KTX2_SS_ZSTANDARD;
+
+  params.m_perceptual = opts.perceptual;
+  params.m_y_flip = opts.y_flip;
+  params.m_mip_gen = opts.mipmap;
+  params.m_mip_srgb = opts.srgb_mipmap;
+  params.m_mip_filter = opts.mipmap_filter;
+  params.m_mip_smallest_dimension = opts.mipmap_min_dimension;
+  params.m_compression_level = opts.compression;
+  params.m_source_images.push_back(img);
+
+  if (opts.uastc) {
+    params.m_rdo_uastc_quality_scalar = opts.quality;
+    params.m_rdo_uastc = opts.quality != 0;
+  } else {
+    params.m_quality_level = static_cast<int>(opts.quality);
+  }
+
+  if (!compressor.init(params)) {
+    return val(std::string("Well something went wrong during init"));
+  }
+
+  if (compressor.process() != 0) {
+    return val(std::string("Well something went wrong during processing"));
+  }
+
+  auto comp_data = compressor.get_output_ktx2_file();
+  auto js_result = Uint8Array.new_(typed_memory_view(comp_data.size(), &comp_data[0]));
+  // Not sure if there is anything to free here
+  return js_result;
+}
+
+EMSCRIPTEN_BINDINGS(my_module) {
+  value_object<BasisOptions>("BasisOptions")
+      .field("quality", &BasisOptions::quality)
+      .field("compression", &BasisOptions::compression)
+      .field("uastc", &BasisOptions::uastc)
+      .field("perceptual", &BasisOptions::perceptual)
+      .field("y_flip", &BasisOptions::y_flip)
+      .field("mipmap", &BasisOptions::mipmap)
+      .field("srgb_mipmap", &BasisOptions::srgb_mipmap)
+      .field("mipmap_filter", &BasisOptions::mipmap_filter)
+      .field("mipmap_min_dimension", &BasisOptions::mipmap_min_dimension);
+
+  function("encode", &encode);
+}

codecs/basis/enc/basis_enc.d.ts

@@ -0,0 +1,24 @@
+export interface EncodeOptions {
+  quality: number;
+  compression: number;
+  uastc: boolean;
+  y_flip: boolean;
+  mipmap: boolean;
+  srgb_mipmap: boolean;
+  perceptual: boolean;
+  mipmap_filter: string;
+  mipmap_min_dimension: number;
+}
+
+export interface BasisModule extends EmscriptenWasm.Module {
+  encode(
+    data: BufferSource,
+    width: number,
+    height: number,
+    options: EncodeOptions,
+  ): Uint8Array | null;
+}
+
+declare var moduleFactory: EmscriptenWasm.ModuleFactory<BasisModule>;
+
+export default moduleFactory;

codecs/basis/enc/basis_enc.js

@@ -0,0 +1,62 @@
+
+var Module = (function() {
+  var _scriptDir = import.meta.url;
+  
+  return (
+function(Module) {
+  Module = Module || {};
+
+
+var f;f||(f=typeof Module !== 'undefined' ? Module : {});var aa,ba;f.ready=new Promise(function(a,b){aa=a;ba=b});var r={},t;for(t in f)f.hasOwnProperty(t)&&(r[t]=f[t]);var u="",ca;u=self.location.href;_scriptDir&&(u=_scriptDir);0!==u.indexOf("blob:")?u=u.substr(0,u.lastIndexOf("/")+1):u="";ca=function(a){var b=new XMLHttpRequest;b.open("GET",a,!1);b.responseType="arraybuffer";b.send(null);return new Uint8Array(b.response)};var da=f.print||console.log.bind(console),v=f.printErr||console.warn.bind(console);
+for(t in r)r.hasOwnProperty(t)&&(f[t]=r[t]);r=null;var ea=0,w;f.wasmBinary&&(w=f.wasmBinary);var noExitRuntime=f.noExitRuntime||!0;"object"!==typeof WebAssembly&&x("no native wasm support detected");var ha,ia=!1,ja=new TextDecoder("utf8");function B(a,b){if(!a)return"";b=a+b;for(var c=a;!(c>=b)&&C[c];)++c;return ja.decode(C.subarray(a,c))}
+function ka(a,b,c){var d=C;if(0<c){c=b+c-1;for(var e=0;e<a.length;++e){var g=a.charCodeAt(e);if(55296<=g&&57343>=g){var k=a.charCodeAt(++e);g=65536+((g&1023)<<10)|k&1023}if(127>=g){if(b>=c)break;d[b++]=g}else{if(2047>=g){if(b+1>=c)break;d[b++]=192|g>>6}else{if(65535>=g){if(b+2>=c)break;d[b++]=224|g>>12}else{if(b+3>=c)break;d[b++]=240|g>>18;d[b++]=128|g>>12&63}d[b++]=128|g>>6&63}d[b++]=128|g&63}}d[b]=0}}var la=new TextDecoder("utf-16le");
+function ma(a,b){var c=a>>1;for(b=c+b/2;!(c>=b)&&D[c];)++c;return la.decode(C.subarray(a,c<<1))}function na(a,b,c){void 0===c&&(c=2147483647);if(2>c)return 0;c-=2;var d=b;c=c<2*a.length?c/2:a.length;for(var e=0;e<c;++e)E[b>>1]=a.charCodeAt(e),b+=2;E[b>>1]=0;return b-d}function oa(a){return 2*a.length}function pa(a,b){for(var c=0,d="";!(c>=b/4);){var e=F[a+4*c>>2];if(0==e)break;++c;65536<=e?(e-=65536,d+=String.fromCharCode(55296|e>>10,56320|e&1023)):d+=String.fromCharCode(e)}return d}
+function qa(a,b,c){void 0===c&&(c=2147483647);if(4>c)return 0;var d=b;c=d+c-4;for(var e=0;e<a.length;++e){var g=a.charCodeAt(e);if(55296<=g&&57343>=g){var k=a.charCodeAt(++e);g=65536+((g&1023)<<10)|k&1023}F[b>>2]=g;b+=4;if(b+4>c)break}F[b>>2]=0;return b-d}function ra(a){for(var b=0,c=0;c<a.length;++c){var d=a.charCodeAt(c);55296<=d&&57343>=d&&++c;b+=4}return b}var sa,H,C,E,D,F,I,ta,ua;
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+var Y=f.stackSave=function(){return(Y=f.stackSave=f.asm.Y).apply(null,arguments)},Z=f.stackRestore=function(){return(Z=f.stackRestore=f.asm.Z).apply(null,arguments)},W=f._setThrew=function(){return(W=f._setThrew=f.asm._).apply(null,arguments)};f.dynCall_jiiii=function(){return(f.dynCall_jiiii=f.asm.aa).apply(null,arguments)};f.dynCall_jiji=function(){return(f.dynCall_jiji=f.asm.ba).apply(null,arguments)};
+function tb(a,b,c){var d=Y();try{J.get(a)(b,c)}catch(e){Z(d);if(e!==e+0&&"longjmp"!==e)throw e;W(1,0)}}function sb(a,b){var c=Y();try{J.get(a)(b)}catch(d){Z(c);if(d!==d+0&&"longjmp"!==d)throw d;W(1,0)}}function qb(a,b,c,d){var e=Y();try{return J.get(a)(b,c,d)}catch(g){Z(e);if(g!==g+0&&"longjmp"!==g)throw g;W(1,0)}}function pb(a,b,c){var d=Y();try{return J.get(a)(b,c)}catch(e){Z(d);if(e!==e+0&&"longjmp"!==e)throw e;W(1,0)}}
+function ob(a,b){var c=Y();try{return J.get(a)(b)}catch(d){Z(c);if(d!==d+0&&"longjmp"!==d)throw d;W(1,0)}}function rb(a,b,c,d,e,g){var k=Y();try{return J.get(a)(b,c,d,e,g)}catch(h){Z(k);if(h!==h+0&&"longjmp"!==h)throw h;W(1,0)}}function ub(a,b,c,d,e){var g=Y();try{J.get(a)(b,c,d,e)}catch(k){Z(g);if(k!==k+0&&"longjmp"!==k)throw k;W(1,0)}}var wb;L=function xb(){wb||yb();wb||(L=xb)};
+function yb(){function a(){if(!wb&&(wb=!0,f.calledRun=!0,!ia)){Da(xa);aa(f);if(f.onRuntimeInitialized)f.onRuntimeInitialized();if(f.postRun)for("function"==typeof f.postRun&&(f.postRun=[f.postRun]);f.postRun.length;){var b=f.postRun.shift();ya.unshift(b)}Da(ya)}}if(!(0<K)){if(f.preRun)for("function"==typeof f.preRun&&(f.preRun=[f.preRun]);f.preRun.length;)za();Da(wa);0<K||(f.setStatus?(f.setStatus("Running..."),setTimeout(function(){setTimeout(function(){f.setStatus("")},1);a()},1)):a())}}f.run=yb;
+if(f.preInit)for("function"==typeof f.preInit&&(f.preInit=[f.preInit]);0<f.preInit.length;)f.preInit.pop()();yb();
+
+
+  return Module.ready
+}
+);
+})();
+export default Module;

codecs/basis/package.json

@@ -0,0 +1,6 @@
+{
+  "type": "module",
+  "scripts": {
+    "build": "../build-cpp.sh"
+  }
+}

codecs/jxl/Makefile

@@ -1,5 +1,5 @@
 CODEC_URL = https://github.com/libjxl/libjxl.git
-CODEC_VERSION = 3f76321a7cbcf4f452894dc173eb7be60f508ecb
+CODEC_VERSION = v0.5
 CODEC_DIR = node_modules/jxl
 CODEC_BUILD_ROOT := $(CODEC_DIR)/build
 CODEC_MT_BUILD_DIR := $(CODEC_BUILD_ROOT)/mt

codecs/mozjpeg/enc/mozjpeg_enc.cpp

@@ -158,6 +158,11 @@ val encode(std::string image_in, int image_width, int image_height, MozJpegOptio
   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.chroma_subsample > 2) {
+      // Otherwise encoding fails.
+      jpeg_c_set_int_param(&cinfo, JINT_DC_SCAN_OPT_MODE, 1);
+    }
   }
 
   if (!opts.baseline && opts.progressive) {

lib/entry-data-plugin.js

@@ -77,7 +77,9 @@ export default function entryDataPlugin() {
             }
 
             return JSON.stringify(
-              getDependencies(chunks, chunk).map((filename) => fileNameToURL(filename)),
+              getDependencies(chunks, chunk).map((filename) =>
+                fileNameToURL(filename),
+              ),
             );
           },
         );

libsquoosh/rollup.config.js

@@ -10,7 +10,7 @@ import { builtinModules } from 'module';
 
 /** @type {import('rollup').RollupOptions} */
 export default {
-  input: 'src/index.js',
+  input: 'src/index.ts',
   output: {
     dir: 'build',
     format: 'cjs',

libsquoosh/src/codecs.ts

@@ -9,6 +9,12 @@ import { cpus } from 'os';
   hardwareConcurrency: cpus().length,
 };
 
+interface DecodeModule extends EmscriptenWasm.Module {
+  decode: (data: Uint8Array) => ImageData;
+}
+
+type DecodeModuleFactory = EmscriptenWasm.ModuleFactory<DecodeModule>;
+
 interface RotateModuleInstance {
   exports: {
     memory: WebAssembly.Memory;
@@ -33,7 +39,7 @@ interface ResizeInstantiateOptions {
 
 declare global {
   // Needed for being able to use ImageData as type in codec types
-  type ImageData = typeof import('./image_data.js');
+  type ImageData = import('./image_data.js').default;
   // Needed for being able to assign to `globalThis.ImageData`
   var ImageData: ImageData['constructor'];
 }
@@ -41,18 +47,21 @@ declare global {
 import type { QuantizerModule } from '../../codecs/imagequant/imagequant.js';
 
 // MozJPEG
+import type { MozJPEGModule as MozJPEGEncodeModule } from '../../codecs/mozjpeg/enc/mozjpeg_enc';
 import mozEnc from '../../codecs/mozjpeg/enc/mozjpeg_node_enc.js';
 import mozEncWasm from 'asset-url:../../codecs/mozjpeg/enc/mozjpeg_node_enc.wasm';
 import mozDec from '../../codecs/mozjpeg/dec/mozjpeg_node_dec.js';
 import mozDecWasm from 'asset-url:../../codecs/mozjpeg/dec/mozjpeg_node_dec.wasm';
 
 // WebP
+import type { WebPModule as WebPEncodeModule } from '../../codecs/webp/enc/webp_enc';
 import webpEnc from '../../codecs/webp/enc/webp_node_enc.js';
 import webpEncWasm from 'asset-url:../../codecs/webp/enc/webp_node_enc.wasm';
 import webpDec from '../../codecs/webp/dec/webp_node_dec.js';
 import webpDecWasm from 'asset-url:../../codecs/webp/dec/webp_node_dec.wasm';
 
 // AVIF
+import type { AVIFModule as AVIFEncodeModule } from '../../codecs/avif/enc/avif_enc';
 import avifEnc from '../../codecs/avif/enc/avif_node_enc.js';
 import avifEncWasm from 'asset-url:../../codecs/avif/enc/avif_node_enc.wasm';
 import avifEncMt from '../../codecs/avif/enc/avif_node_enc_mt.js';
@@ -62,12 +71,14 @@ import avifDec from '../../codecs/avif/dec/avif_node_dec.js';
 import avifDecWasm from 'asset-url:../../codecs/avif/dec/avif_node_dec.wasm';
 
 // JXL
+import type { JXLModule as JXLEncodeModule } from '../../codecs/jxl/enc/jxl_enc';
 import jxlEnc from '../../codecs/jxl/enc/jxl_node_enc.js';
 import jxlEncWasm from 'asset-url:../../codecs/jxl/enc/jxl_node_enc.wasm';
 import jxlDec from '../../codecs/jxl/dec/jxl_node_dec.js';
 import jxlDecWasm from 'asset-url:../../codecs/jxl/dec/jxl_node_dec.wasm';
 
 // WP2
+import type { WP2Module as WP2EncodeModule } from '../../codecs/wp2/enc/wp2_enc';
 import wp2Enc from '../../codecs/wp2/enc/wp2_node_enc.js';
 import wp2EncWasm from 'asset-url:../../codecs/wp2/enc/wp2_node_enc.wasm';
 import wp2Dec from '../../codecs/wp2/dec/wp2_node_dec.js';
@@ -257,15 +268,20 @@ export const preprocessors = {
       numRotations: 0,
     },
   },
-};
+} as const;
 
 export const codecs = {
   mozjpeg: {
     name: 'MozJPEG',
     extension: 'jpg',
     detectors: [/^\xFF\xD8\xFF/],
-    dec: () => instantiateEmscriptenWasm(mozDec, mozDecWasm),
-    enc: () => instantiateEmscriptenWasm(mozEnc, mozEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(mozDec as DecodeModuleFactory, mozDecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        mozEnc as EmscriptenWasm.ModuleFactory<MozJPEGEncodeModule>,
+        mozEncWasm,
+      ),
     defaultEncoderOptions: {
       quality: 75,
       baseline: false,
@@ -294,8 +310,13 @@ export const codecs = {
     name: 'WebP',
     extension: 'webp',
     detectors: [/^RIFF....WEBPVP8[LX ]/s],
-    dec: () => instantiateEmscriptenWasm(webpDec, webpDecWasm),
-    enc: () => instantiateEmscriptenWasm(webpEnc, webpEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(webpDec as DecodeModuleFactory, webpDecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        webpEnc as EmscriptenWasm.ModuleFactory<WebPEncodeModule>,
+        webpEncWasm,
+      ),
     defaultEncoderOptions: {
       quality: 75,
       target_size: 0,
@@ -335,16 +356,20 @@ export const codecs = {
     name: 'AVIF',
     extension: 'avif',
     detectors: [/^\x00\x00\x00 ftypavif\x00\x00\x00\x00/],
-    dec: () => instantiateEmscriptenWasm(avifDec, avifDecWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(avifDec as DecodeModuleFactory, avifDecWasm),
     enc: async () => {
       if (await threads()) {
         return instantiateEmscriptenWasm(
-          avifEncMt,
+          avifEncMt as EmscriptenWasm.ModuleFactory<AVIFEncodeModule>,
           avifEncMtWasm,
           avifEncMtWorker,
         );
       }
-      return instantiateEmscriptenWasm(avifEnc, avifEncWasm);
+      return instantiateEmscriptenWasm(
+        avifEnc as EmscriptenWasm.ModuleFactory<AVIFEncodeModule>,
+        avifEncWasm,
+      );
     },
     defaultEncoderOptions: {
       cqLevel: 33,
@@ -368,8 +393,13 @@ export const codecs = {
     name: 'JPEG-XL',
     extension: 'jxl',
     detectors: [/^\xff\x0a/],
-    dec: () => instantiateEmscriptenWasm(jxlDec, jxlDecWasm),
-    enc: () => instantiateEmscriptenWasm(jxlEnc, jxlEncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(jxlDec as DecodeModuleFactory, jxlDecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        jxlEnc as EmscriptenWasm.ModuleFactory<JXLEncodeModule>,
+        jxlEncWasm,
+      ),
     defaultEncoderOptions: {
       speed: 4,
       quality: 75,
@@ -389,8 +419,13 @@ export const codecs = {
     name: 'WebP2',
     extension: 'wp2',
     detectors: [/^\xF4\xFF\x6F/],
-    dec: () => instantiateEmscriptenWasm(wp2Dec, wp2DecWasm),
-    enc: () => instantiateEmscriptenWasm(wp2Enc, wp2EncWasm),
+    dec: () =>
+      instantiateEmscriptenWasm(wp2Dec as DecodeModuleFactory, wp2DecWasm),
+    enc: () =>
+      instantiateEmscriptenWasm(
+        wp2Enc as EmscriptenWasm.ModuleFactory<WP2EncodeModule>,
+        wp2EncWasm,
+      ),
     defaultEncoderOptions: {
       quality: 75,
       alpha_quality: 75,
@@ -421,7 +456,7 @@ export const codecs = {
       await oxipngPromise;
       return {
         encode: (
-          buffer: Uint8Array,
+          buffer: Uint8ClampedArray | ArrayBuffer,
           width: number,
           height: number,
           opts: { level: number },
@@ -444,4 +479,4 @@ export const codecs = {
       max: 1,
     },
   },
-};
+} as const;

libsquoosh/src/index.ts

@@ -5,10 +5,18 @@ import { promises as fsp } from 'fs';
 import { codecs as encoders, preprocessors } from './codecs.js';
 import WorkerPool from './worker_pool.js';
 import { autoOptimize } from './auto-optimizer.js';
+import type ImageData from './image_data';
 
 export { ImagePool, encoders, preprocessors };
+type EncoderKey = keyof typeof encoders;
+type PreprocessorKey = keyof typeof preprocessors;
+type FileLike = Buffer | ArrayBuffer | string | ArrayBufferView;
 
-async function decodeFile({ file }) {
+async function decodeFile({
+  file,
+}: {
+  file: FileLike;
+}): Promise<{ bitmap: ImageData; size: number }> {
   let buffer;
   if (ArrayBuffer.isView(file)) {
     buffer = Buffer.from(file.buffer);
@@ -16,8 +24,9 @@ async function decodeFile({ file }) {
   } else if (file instanceof ArrayBuffer) {
     buffer = Buffer.from(file);
     file = 'Binary blob';
-  } else if (file instanceof Buffer) {
-    buffer = file;
+  } else if ((file as unknown) instanceof Buffer) {
+    // TODO: Check why we need type assertions here.
+    buffer = (file as unknown) as Buffer;
     file = 'Binary blob';
   } else if (typeof file === 'string') {
     buffer = await fsp.readFile(file);
@@ -28,23 +37,33 @@ async function decodeFile({ file }) {
   const firstChunkString = Array.from(firstChunk)
     .map((v) => String.fromCodePoint(v))
     .join('');
-  const key = Object.entries(encoders).find(([name, { detectors }]) =>
+  const key = Object.entries(encoders).find(([_name, { detectors }]) =>
     detectors.some((detector) => detector.exec(firstChunkString)),
-  )?.[0];
+  )?.[0] as EncoderKey | undefined;
   if (!key) {
     throw Error(`${file} has an unsupported format`);
   }
-  const rgba = (await encoders[key].dec()).decode(new Uint8Array(buffer));
+  const encoder = encoders[key];
+  const mod = await encoder.dec();
+  const rgba = mod.decode(new Uint8Array(buffer));
   return {
     bitmap: rgba,
     size: buffer.length,
   };
 }
 
-async function preprocessImage({ preprocessorName, options, image }) {
+async function preprocessImage({
+  preprocessorName,
+  options,
+  image,
+}: {
+  preprocessorName: PreprocessorKey;
+  options: any;
+  image: { bitmap: ImageData };
+}) {
   const preprocessor = await preprocessors[preprocessorName].instantiate();
   image.bitmap = await preprocessor(
-    image.bitmap.data,
+    Uint8Array.from(image.bitmap.data),
     image.bitmap.width,
     image.bitmap.height,
     options,
@@ -58,26 +77,39 @@ async function encodeImage({
   encConfig,
   optimizerButteraugliTarget,
   maxOptimizerRounds,
+}: {
+  bitmap: ImageData;
+  encName: EncoderKey;
+  encConfig: any;
+  optimizerButteraugliTarget: number;
+  maxOptimizerRounds: number;
 }) {
-  let binary;
+  let binary: Uint8Array;
   let optionsUsed = encConfig;
   const encoder = await encoders[encName].enc();
   if (encConfig === 'auto') {
     const optionToOptimize = encoders[encName].autoOptimize.option;
     const decoder = await encoders[encName].dec();
-    const encode = (bitmapIn, quality) =>
+    const encode = (bitmapIn: ImageData, quality: number) =>
       encoder.encode(
         bitmapIn.data,
         bitmapIn.width,
         bitmapIn.height,
-        Object.assign({}, encoders[encName].defaultEncoderOptions, {
+        Object.assign({}, encoders[encName].defaultEncoderOptions as any, {
           [optionToOptimize]: quality,
         }),
       );
-    const decode = (binary) => decoder.decode(binary);
+    const decode = (binary: Uint8Array) => decoder.decode(binary);
+    const nonNullEncode = (bitmap: ImageData, quality: number): Uint8Array => {
+      const result = encode(bitmap, quality);
+      if (!result) {
+        throw new Error('There was an error while encoding');
+      }
+      return result;
+    };
     const { binary: optimizedBinary, quality } = await autoOptimize(
       bitmapIn,
-      encode,
+      nonNullEncode,
       decode,
       {
         min: encoders[encName].autoOptimize.min,
@@ -92,12 +124,18 @@ async function encodeImage({
       [optionToOptimize]: Math.round(quality * 10000) / 10000,
     };
   } else {
-    binary = encoder.encode(
+    const result = encoder.encode(
       bitmapIn.data.buffer,
       bitmapIn.width,
       bitmapIn.height,
       encConfig,
     );
+
+    if (!result) {
+      throw new Error('There was an error while encoding');
+    }
+
+    binary = result;
   }
   return {
     optionsUsed,
@@ -107,10 +145,15 @@ async function encodeImage({
   };
 }
 
-// both decoding and encoding go through the worker pool
-function handleJob(params) {
-  const { operation } = params;
-  switch (operation) {
+type EncodeParams = { operation: 'encode' } & Parameters<typeof encodeImage>[0];
+type DecodeParams = { operation: 'decode' } & Parameters<typeof decodeFile>[0];
+type PreprocessParams = { operation: 'preprocess' } & Parameters<
+  typeof preprocessImage
+>[0];
+type JobMessage = EncodeParams | DecodeParams | PreprocessParams;
+
+function handleJob(params: JobMessage) {
+  switch (params.operation) {
     case 'encode':
       return encodeImage(params);
     case 'decode':
@@ -118,7 +161,7 @@ function handleJob(params) {
     case 'preprocess':
       return preprocessImage(params);
     default:
-      throw Error(`Invalid job "${operation}"`);
+      throw Error(`Invalid job "${(params as any).operation}"`);
   }
 }
 
@@ -126,7 +169,12 @@ function handleJob(params) {
  * Represents an ingested image.
  */
 class Image {
-  constructor(workerPool, file) {
+  public file: FileLike;
+  public workerPool: WorkerPool<JobMessage, any>;
+  public decoded: Promise<{ bitmap: ImageData }>;
+  public encodedWith: { [key: string]: any };
+
+  constructor(workerPool: WorkerPool<JobMessage, any>, file: FileLike) {
     this.file = file;
     this.workerPool = workerPool;
     this.decoded = workerPool.dispatchJob({ operation: 'decode', file });
@@ -143,14 +191,15 @@ class Image {
       if (!Object.keys(preprocessors).includes(name)) {
         throw Error(`Invalid preprocessor "${name}"`);
       }
+      const preprocessorName = name as PreprocessorKey;
       const preprocessorOptions = Object.assign(
         {},
-        preprocessors[name].defaultOptions,
+        preprocessors[preprocessorName].defaultOptions,
         options,
       );
       this.decoded = this.workerPool.dispatchJob({
         operation: 'preprocess',
-        preprocessorName: name,
+        preprocessorName,
         image: await this.decoded,
         options: preprocessorOptions,
       });
@@ -161,14 +210,22 @@ class Image {
   /**
    * Define one or several encoders to use on the image.
    * @param {object} encodeOptions - An object with encoders to use, and their settings.
-   * @returns {Promise<undefined>} - A promise that resolves when the image has been encoded with all the specified encoders.
+   * @returns {Promise<void>} - A promise that resolves when the image has been encoded with all the specified encoders.
    */
-  async encode(encodeOptions = {}) {
+  async encode(
+    encodeOptions: {
+      optimizerButteraugliTarget?: number;
+      maxOptimizerRounds?: number;
+    } & {
+      [key in EncoderKey]?: any; // any is okay for now
+    } = {},
+  ): Promise<void> {
     const { bitmap } = await this.decoded;
-    for (const [encName, options] of Object.entries(encodeOptions)) {
-      if (!Object.keys(encoders).includes(encName)) {
+    for (const [name, options] of Object.entries(encodeOptions)) {
+      if (!Object.keys(encoders).includes(name)) {
         continue;
       }
+      const encName = name as EncoderKey;
       const encRef = encoders[encName];
       const encConfig =
         typeof options === 'string'
@@ -193,28 +250,30 @@ class Image {
  * A pool where images can be ingested and squooshed.
  */
 class ImagePool {
+  public workerPool: WorkerPool<JobMessage, any>;
+
   /**
    * Create a new pool.
    * @param {number} [threads] - Number of concurrent image processes to run in the pool. Defaults to the number of CPU cores in the system.
    */
-  constructor(threads) {
+  constructor(threads: number) {
     this.workerPool = new WorkerPool(threads || cpus().length, __filename);
   }
 
   /**
    * Ingest an image into the image pool.
-   * @param {string | Buffer | URL | object} image - The image or path to the image that should be ingested and decoded.
+   * @param {FileLike} image - The image or path to the image that should be ingested and decoded.
    * @returns {Image} - A custom class reference to the decoded image.
    */
-  ingestImage(image) {
+  ingestImage(image: FileLike): Image {
     return new Image(this.workerPool, image);
   }
 
   /**
    * Closes the underlying image processing pipeline. The already processed images will still be there, but no new processing can start.
-   * @returns {Promise<undefined>} - A promise that resolves when the underlying pipeline has closed.
+   * @returns {Promise<void>} - A promise that resolves when the underlying pipeline has closed.
    */
-  async close() {
+  async close(): Promise<void> {
     await this.workerPool.join();
   }
 }

libsquoosh/src/worker_pool.ts

@@ -7,26 +7,19 @@ function uuid() {
   ).join('');
 }
 
-function jobPromise(worker, msg) {
-  return new Promise((resolve, reject) => {
-    const id = uuid();
-    worker.postMessage({ msg, id });
-    worker.on('message', function f({ error, result, id: rid }) {
-      if (rid !== id) {
-        return;
-      }
-      if (error) {
-        reject(error);
-        return;
-      }
-      worker.off('message', f);
-      resolve(result);
-    });
-  });
+interface Job<I> {
+  msg: I;
+  resolve: Function;
+  reject: Function;
 }
 
-export default class WorkerPool {
-  constructor(numWorkers, workerFile) {
+export default class WorkerPool<I, O> {
+  public numWorkers: number;
+  public jobQueue: TransformStream<Job<I>, Job<I>>;
+  public workerQueue: TransformStream<Worker, Worker>;
+  public done: Promise<void>;
+
+  constructor(numWorkers: number, workerFile: string) {
     this.numWorkers = numWorkers;
     this.jobQueue = new TransformStream();
     this.workerQueue = new TransformStream();
@@ -48,9 +41,14 @@ export default class WorkerPool {
         await this._terminateAll();
         return;
       }
+
+      if (!value) {
+        throw new Error('Reader did not return any value');
+      }
+
       const { msg, resolve, reject } = value;
       const worker = await this._nextWorker();
-      jobPromise(worker, msg)
+      this.jobPromise(worker, msg)
         .then((result) => resolve(result))
         .catch((reason) => reject(reason))
         .finally(() => {
@@ -66,6 +64,10 @@ export default class WorkerPool {
     const reader = this.workerQueue.readable.getReader();
     const { value } = await reader.read();
     reader.releaseLock();
+    if (!value) {
+      throw new Error('No worker left');
+    }
+
     return value;
   }
 
@@ -82,7 +84,7 @@ export default class WorkerPool {
     await this.done;
   }
 
-  dispatchJob(msg) {
+  dispatchJob(msg: I): Promise<O> {
     return new Promise((resolve, reject) => {
       const writer = this.jobQueue.writable.getWriter();
       writer.write({ msg, resolve, reject });
@@ -90,14 +92,32 @@ export default class WorkerPool {
     });
   }
 
-  static useThisThreadAsWorker(cb) {
-    parentPort.on('message', async (data) => {
+  private jobPromise(worker: Worker, msg: I) {
+    return new Promise((resolve, reject) => {
+      const id = uuid();
+      worker.postMessage({ msg, id });
+      worker.on('message', function f({ error, result, id: rid }) {
+        if (rid !== id) {
+          return;
+        }
+        if (error) {
+          reject(error);
+          return;
+        }
+        worker.off('message', f);
+        resolve(result);
+      });
+    });
+  }
+
+  static useThisThreadAsWorker<I, O>(cb: (msg: I) => O) {
+    parentPort!.on('message', async (data) => {
       const { msg, id } = data;
       try {
         const result = await cb(msg);
-        parentPort.postMessage({ result, id });
+        parentPort!.postMessage({ result, id });
       } catch (e) {
-        parentPort.postMessage({ error: e.message, id });
+        parentPort!.postMessage({ error: e.message, id });
       }
     });
   }

src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/index.ts

@@ -112,18 +112,23 @@ class RangeInputElement extends HTMLElement {
     this.dispatchEvent(retargetted);
   };
 
+  private _formatDisplayValue(value: number): string {
+    const labelPrecision =
+      Number(this.labelPrecision) || getPrescision(this.step) || 0;
+    if (labelPrecision) {
+      return value.toFixed(labelPrecision);
+    }
+    return Math.round(value).toString();
+  }
+
   private _update = () => {
     // Not connected?
     if (!this._valueDisplay) return;
     const value = Number(this.value) || 0;
     const min = Number(this.min) || 0;
     const max = Number(this.max) || 100;
-    const labelPrecision =
-      Number(this.labelPrecision) || getPrescision(this.step) || 0;
     const percent = (100 * (value - min)) / (max - min);
-    const displayValue = labelPrecision
-      ? value.toFixed(labelPrecision)
-      : Math.round(value).toString();
+    const displayValue = this._formatDisplayValue(value);
 
     this._valueDisplay!.textContent = displayValue;
     this.style.setProperty('--value-percent', percent + '%');

src/client/lazy-app/Compress/Options/style.css

@@ -1,6 +1,7 @@
 .options-scroller {
   --horizontal-padding: 15px;
   border-radius: var(--scroller-radius);
+  overflow: hidden;
 
   /* At smaller widths, the multi-panel handles the scrolling */
   @media (min-width: 600px) {

src/client/lazy-app/Compress/Output/custom-els/PinchZoom/index.ts

@@ -81,6 +81,7 @@ function createPoint(): SVGPoint {
 }
 
 const MIN_SCALE = 0.01;
+const MAX_SCALE = 100000;
 
 export default class PinchZoom extends HTMLElement {
   // The element that we'll transform.
@@ -244,6 +245,9 @@ export default class PinchZoom extends HTMLElement {
     // Avoid scaling to zero
     if (scale < MIN_SCALE) return;
 
+    // Avoid scaling to very large values
+    if (scale > MAX_SCALE) return;
+
     // Return if there's no change
     if (scale === this.scale && x === this.x && y === this.y) return;
 
@@ -296,9 +300,13 @@ export default class PinchZoom extends HTMLElement {
       deltaY *= 15;
     }
 
+    const zoomingOut = deltaY > 0;
+
     // ctrlKey is true when pinch-zooming on a trackpad.
     const divisor = ctrlKey ? 100 : 300;
-    const scaleDiff = 1 - deltaY / divisor;
+    // when zooming out, invert the delta and the ratio to keep zoom stable
+    const ratio = 1 - (zoomingOut ? -deltaY : deltaY) / divisor;
+    const scaleDiff = zoomingOut ? 1 / ratio : ratio;
 
     this._applyChange({
       scaleDiff,

src/client/lazy-app/Compress/index.tsx

@@ -100,6 +100,9 @@ async function decodeImage(
 
   try {
     if (!canDecode) {
+      if (mimeType === 'image/ktx2') {
+        return await workerBridge.basisDecode(signal, blob);
+      }
       if (mimeType === 'image/avif') {
         return await workerBridge.avifDecode(signal, blob);
       }

src/client/lazy-app/util/index.ts

@@ -100,6 +100,7 @@ const magicNumberMapInput = [
   [/^\x00\x00\x00 ftypavif\x00\x00\x00\x00/, 'image/avif'],
   [/^\xff\x0a/, 'image/jxl'],
   [/^\x00\x00\x00\x0cJXL \x0d\x0a\x87\x0a/, 'image/jxl'],
+  [/^«KTX 20»\r\n/, 'image/ktx2'],
 ] as const;
 
 export type ImageMimeTypes = typeof magicNumberMapInput[number][1];
@@ -295,3 +296,16 @@ export async function abortable<T>(
     }),
   ]);
 }
+
+/**
+ * Clamp a value `v` between `min` and `max`.
+ */
+export function clamp(min: number, v: number, max: number): number {
+  if (v < min) {
+    return min;
+  }
+  if (v > max) {
+    return max;
+  }
+  return v;
+}

src/features/decoders/basis/worker/basisDecode.ts

@@ -0,0 +1,32 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import type { BasisModule } from 'codecs/basis/dec/basis_dec';
+import { initEmscriptenModule, blobToArrayBuffer } from 'features/worker-utils';
+
+let emscriptenModule: Promise<BasisModule>;
+
+export default async function decode(blob: Blob): Promise<ImageData> {
+  if (!emscriptenModule) {
+    const decoder = await import('codecs/basis/dec/basis_dec');
+    emscriptenModule = initEmscriptenModule(decoder.default);
+  }
+
+  const [module, data] = await Promise.all([
+    emscriptenModule,
+    blobToArrayBuffer(blob),
+  ]);
+
+  const result = module.decode(data);
+  if (!result) throw new Error('Decoding error');
+  return result;
+}

src/features/encoders/basis/client/index.tsx

@@ -0,0 +1,214 @@
+import { EncodeOptions, defaultOptions } from '../shared/meta';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
+import { h, Component, Fragment } from 'preact';
+import {
+  inputFieldChecked,
+  inputFieldValueAsNumber,
+  preventDefault,
+  clamp,
+} from 'client/lazy-app/util';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import linkState from 'linkstate';
+import Range from 'client/lazy-app/Compress/Options/Range';
+import Checkbox from 'client/lazy-app/Compress/Options/Checkbox';
+import Expander from 'client/lazy-app/Compress/Options/Expander';
+import Select from 'client/lazy-app/Compress/Options/Select';
+import Revealer from 'client/lazy-app/Compress/Options/Revealer';
+
+export function encode(
+  signal: AbortSignal,
+  workerBridge: WorkerBridge,
+  imageData: ImageData,
+  options: EncodeOptions,
+) {
+  return workerBridge.basisEncode(signal, imageData, options);
+}
+
+interface Props {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+}
+
+interface State {
+  showAdvanced: boolean;
+}
+
+export class Options extends Component<Props, State> {
+  state: State = {
+    showAdvanced: false,
+  };
+
+  onChange = (event: Event) => {
+    const form = (event.currentTarget as HTMLInputElement).closest(
+      'form',
+    ) as HTMLFormElement;
+    const { options } = this.props;
+
+    const uastc = form.mode.value === '1';
+    let quality = inputFieldValueAsNumber(form.quality, options.quality);
+    if (uastc) {
+      quality = clamp(0, quality, 4);
+    } else {
+      quality = Math.floor(clamp(0, quality, 255));
+    }
+
+    const newOptions: EncodeOptions = {
+      ...this.props.options,
+      uastc,
+      quality,
+      y_flip: inputFieldChecked(form.y_flip, options.y_flip),
+      perceptual: inputFieldChecked(form.perceptual, options.perceptual),
+      mipmap: inputFieldChecked(form.mipmap, options.mipmap),
+      srgb_mipmap: inputFieldChecked(form.srgb_mipmap, options.srgb_mipmap),
+      mipmap_filter: form.mipmap_filter?.value ?? defaultOptions.mipmap_filter,
+      // FIXME: We really should support range remapping
+      // in the range-slider component. For now I’ll
+      // shoe-horn it into the state management.
+      mipmap_min_dimension:
+        2 **
+        inputFieldValueAsNumber(
+          form.mipmap_min_dimension,
+          Math.floor(Math.log2(options.mipmap_min_dimension)),
+        ),
+      compression: inputFieldValueAsNumber(
+        form.compression,
+        options.compression,
+      ),
+    };
+    this.props.onChange(newOptions);
+  };
+
+  render({ options }: Props, { showAdvanced }: State) {
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <label class={style.optionTextFirst}>
+          Mode:
+          <Select
+            name="mode"
+            value={options.uastc ? '1' : '0'}
+            onChange={this.onChange}
+          >
+            <option value="0">Compression (ETC1S)</option>
+            <option value="1">Quality (UASTC)</option>
+          </Select>
+        </label>
+        <div class={style.optionOneCell}>
+          <Range
+            name="quality"
+            min={options.uastc ? '0' : '1'}
+            max={options.uastc ? '4' : '255'}
+            step={options.uastc ? '0.1' : '1'}
+            value={options.quality}
+            onInput={this.onChange}
+          >
+            Quality:
+          </Range>
+        </div>
+        <div class={style.optionOneCell}>
+          <Range
+            name="compression"
+            min="0"
+            max="4"
+            value={options.compression}
+            onInput={this.onChange}
+          >
+            Compression:
+          </Range>
+        </div>
+        <label class={style.optionToggle}>
+          Flip Y Axis
+          <Checkbox
+            name="y_flip"
+            checked={options.y_flip}
+            onChange={this.onChange}
+          />
+        </label>
+        <label class={style.optionReveal}>
+          <Revealer
+            checked={showAdvanced}
+            onChange={linkState(this, 'showAdvanced')}
+          />
+          Advanced settings
+        </label>
+        <Expander>
+          {showAdvanced ? (
+            <div>
+              <label class={style.optionToggle}>
+                Perceptual distance metric
+                <Checkbox
+                  name="perceptual"
+                  checked={options.perceptual}
+                  onChange={this.onChange}
+                />
+              </label>
+              <label class={style.optionToggle}>
+                Embed Mipmaps
+                <Checkbox
+                  name="mipmap"
+                  checked={options.mipmap}
+                  onChange={this.onChange}
+                />
+              </label>
+              <Expander>
+                {options.mipmap ? (
+                  <Fragment>
+                    <div class={style.optionOneCell}>
+                      <Range
+                        min="0"
+                        max="10"
+                        name="mipmap_min_dimension"
+                        value={Math.floor(
+                          Math.log2(options.mipmap_min_dimension),
+                        )}
+                        onInput={this.onChange}
+                      >
+                        Log2 of smallest mipmap:
+                      </Range>
+                    </div>
+                    <label class={style.optionTextFirst}>
+                      Resampling filter:
+                      <Select
+                        name="mipmap_filter"
+                        value={options.mipmap_filter}
+                        onChange={this.onChange}
+                      >
+                        <option value="box">Box</option>
+                        <option value="tent">Tent</option>
+                        <option value="bell">Bell</option>
+                        <option value="b-spline">B-Spline</option>
+                        <option value="mitchell">Mitchell</option>
+                        <option value="blackman">Blackman</option>
+                        <option value="lanczos3">Lanczos3</option>
+                        <option value="lanczos4">Lanczos4</option>
+                        <option value="lanczos6">Lanczos6</option>
+                        <option value="lanczos12">Lanczos12</option>
+                        <option value="kaiser">Kaiser</option>
+                        <option value="gaussian">Gaussian</option>
+                        <option value="catmullrom">Catmullrom</option>
+                        <option value="quadratic_interp">
+                          Quadratic Interpolation
+                        </option>
+                        <option value="quadratic_approx">
+                          Quadratic Approx
+                        </option>
+                        <option value="quadratic_mix">Quadratic Mix</option>
+                      </Select>
+                    </label>
+                    <label class={style.optionToggle}>
+                      sRGB Mipmapping
+                      <Checkbox
+                        name="srgb_mipmap"
+                        checked={options.srgb_mipmap}
+                        onChange={this.onChange}
+                      />
+                    </label>
+                  </Fragment>
+                ) : null}
+              </Expander>
+            </div>
+          ) : null}
+        </Expander>
+      </form>
+    );
+  }
+}

src/features/encoders/basis/shared/meta.ts

@@ -0,0 +1,30 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { EncodeOptions } from 'codecs/basis/enc/basis_enc';
+
+export { EncodeOptions };
+
+export const label = 'KTX2 (Basis Universal)';
+export const mimeType = 'image/ktx2';
+export const extension = 'ktx2';
+export const defaultOptions: EncodeOptions = {
+  quality: 128,
+  compression: 2,
+  uastc: false,
+  mipmap: false,
+  srgb_mipmap: false,
+  perceptual: true,
+  y_flip: false,
+  mipmap_filter: 'kaiser',
+  mipmap_min_dimension: 1,
+};

src/features/encoders/basis/shared/missing-types.d.ts

@@ -0,0 +1,13 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/// <reference path="../../../../../missing-types.d.ts" />

src/features/encoders/basis/worker/basisEncode.ts

@@ -0,0 +1,36 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import type { BasisModule } from 'codecs/basis/enc/basis_enc';
+import type { EncodeOptions } from '../shared/meta';
+import { initEmscriptenModule } from 'features/worker-utils';
+
+let emscriptenModule: Promise<BasisModule>;
+
+async function init() {
+  const basisEncoder = await import('codecs/basis/enc/basis_enc.js');
+  return initEmscriptenModule(basisEncoder.default);
+}
+
+export default async function encode(
+  data: ImageData,
+  options: EncodeOptions,
+): Promise<ArrayBuffer> {
+  if (!emscriptenModule) emscriptenModule = init();
+
+  const module = await emscriptenModule;
+  const result = module.encode(data.data, data.width, data.height, options);
+
+  if (!result) throw new Error('Encoding error');
+
+  return result.buffer;
+}

src/features/encoders/basis/worker/missing-types.d.ts

@@ -0,0 +1,13 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/// <reference path="../../../../../missing-types.d.ts" />

src/shared/prerendered-app/Intro/SlideOnScroll/index.tsx

@@ -0,0 +1,51 @@
+import { h, Component, RenderableProps } from 'preact';
+
+interface Props {}
+interface State {}
+
+export default class SlideOnScroll extends Component<Props, State> {
+  private observer?: IntersectionObserver;
+
+  componentDidMount() {
+    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;
+
+    const base = this.base as HTMLElement;
+    let wasOutOfView = false;
+
+    this.observer = new IntersectionObserver(
+      (entries, observer) => {
+        for (const entry of entries) {
+          if (!entry.isIntersecting) {
+            wasOutOfView = true;
+            base.style.opacity = '0';
+            return;
+          }
+
+          // Only transition in if the element was at some point out of view.
+          if (wasOutOfView) {
+            base.style.opacity = '';
+            base.animate(
+              { offset: 0, opacity: '0', transform: 'translateY(40px)' },
+              { duration: 300, easing: 'ease' },
+            );
+          }
+          observer.unobserve(entry.target);
+        }
+      },
+      { threshold: 0.2 },
+    );
+
+    this.observer.observe(base);
+  }
+
+  componentWillUnmount() {
+    // Have to manually disconnect due to memory leaks in browsers.
+    // One day we'll be able to remove this, and the private property.
+    // https://twitter.com/jaffathecake/status/1405437361643790337
+    if (this.observer) this.observer.disconnect();
+  }
+
+  render({ children }: RenderableProps<Props>) {
+    return <div>{children}</div>;
+  }
+}

src/shared/prerendered-app/Intro/imgs/info-content/secure.svg

@@ -0,0 +1 @@
+<svg width="498" height="333" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M401.17 125.52C387.072 53.923 324.253.173 248.787.173c-59.916 0-111.954 34.035-137.869 83.841C48.513 90.655 0 143.574 0 207.7c0 68.692 55.77 124.516 124.394 124.516h269.519c57.221 0 103.662-46.486 103.662-103.763 0-54.787-42.502-99.198-96.405-102.933z" fill="#91D3FF" fill-opacity=".3"/><path d="M187.247 121.321l-3.987-3.987-3.481 4.434c-11.519 14.67-18.366 33.15-18.366 53.242 0 48.003 38.882 86.885 86.885 86.885 20.091 0 38.572-6.848 53.242-18.366l4.434-3.482-3.987-3.986-114.74-114.74zM309.348 228.7l3.987 3.986 3.481-4.434c11.519-14.669 18.366-33.15 18.366-53.242 0-48.002-38.882-86.884-86.884-86.884-20.092 0-38.573 6.847-53.242 18.365l-4.435 3.482 3.987 3.986L309.348 228.7zm-158.406-53.69c0-53.739 43.617-97.355 97.356-97.355 53.738 0 97.355 43.616 97.355 97.355 0 53.739-43.617 97.356-97.355 97.356-53.739 0-97.356-43.617-97.356-97.356z" fill="#FF3385" stroke="#FF3385" stroke-width="10"/></svg>

src/shared/prerendered-app/Intro/index.tsx

@@ -10,12 +10,16 @@ import deviceScreen from 'url:./imgs/demos/demo-device-screen.png';
 import largePhotoIcon from 'url:./imgs/demos/icon-demo-large-photo.jpg';
 import artworkIcon from 'url:./imgs/demos/icon-demo-artwork.jpg';
 import deviceScreenIcon from 'url:./imgs/demos/icon-demo-device-screen.jpg';
+import smallSectionAsset from 'url:./imgs/info-content/small.svg';
+import simpleSectionAsset from 'url:./imgs/info-content/simple.svg';
+import secureSectionAsset from 'url:./imgs/info-content/secure.svg';
 import logoIcon from 'url:./imgs/demos/icon-demo-logo.png';
 import logoWithText from 'url:./imgs/logo-with-text.svg';
 import * as style from './style.css';
 import type SnackBarElement from 'shared/custom-els/snack-bar';
 import 'shared/custom-els/snack-bar';
 import { startBlobs } from './blob-anim/meta';
+import SlideOnScroll from './SlideOnScroll';
 
 const demos = [
   {
@@ -336,37 +340,125 @@ export default class Intro extends Component<Props, State> {
             </ul>
           </div>
         </div>
-        <div class={style.footer}>
+
+        <div class={style.bottomWave}>
           <svg viewBox="0 0 1920 79" class={style.topWave}>
             <path
               d="M0 59l64-11c64-11 192-34 320-43s256-5 384 4 256 23 384 34 256 21 384 14 256-30 320-41l64-11v94H0z"
-              class={style.footerWave}
+              class={style.infoWave}
             />
           </svg>
-          <div class={style.contentPadding}>
-            <footer class={style.footerItems}>
-              <a
-                class={style.footerLink}
-                href="https://github.com/GoogleChromeLabs/squoosh/blob/dev/README.md#privacy"
-              >
-                Privacy
-              </a>
-              <a
-                class={style.footerLink}
-                href="https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli"
-              >
-                Squoosh CLI
-              </a>
-              <a
-                class={style.footerLinkWithLogo}
-                href="https://github.com/GoogleChromeLabs/squoosh"
-              >
-                <img src={githubLogo} alt="" width="10" height="10" />
-                Source on Github
-              </a>
-            </footer>
-          </div>
         </div>
+
+        <section class={style.info}>
+          <div class={style.infoContainer}>
+            <SlideOnScroll>
+              <div class={style.infoContent}>
+                <div class={style.infoTextWrapper}>
+                  <h2 class={style.infoTitle}>Small</h2>
+                  <p class={style.infoCaption}>
+                    Smaller images mean faster load times. Squoosh can reduce
+                    file size and maintain high quality.
+                  </p>
+                </div>
+                <div class={style.infoImgWrapper}>
+                  <img
+                    class={style.infoImg}
+                    src={smallSectionAsset}
+                    alt="silhouette of a large 1.4 megabyte image shrunk into a smaller 80 kilobyte image"
+                    width="536"
+                    height="522"
+                  />
+                </div>
+              </div>
+            </SlideOnScroll>
+          </div>
+        </section>
+
+        <section class={style.info}>
+          <div class={style.infoContainer}>
+            <SlideOnScroll>
+              <div class={style.infoContent}>
+                <div class={style.infoTextWrapper}>
+                  <h2 class={style.infoTitle}>Simple</h2>
+                  <p class={style.infoCaption}>
+                    Open your image, inspect the differences, then save
+                    instantly. Feeling adventurous? Adjust the settings for even
+                    smaller files.
+                  </p>
+                </div>
+                <div class={style.infoImgWrapper}>
+                  <img
+                    class={style.infoImg}
+                    src={simpleSectionAsset}
+                    alt="grid of multiple shrunk images displaying various options"
+                    width="538"
+                    height="384"
+                  />
+                </div>
+              </div>
+            </SlideOnScroll>
+          </div>
+        </section>
+
+        <section class={style.info}>
+          <div class={style.infoContainer}>
+            <SlideOnScroll>
+              <div class={style.infoContent}>
+                <div class={style.infoTextWrapper}>
+                  <h2 class={style.infoTitle}>Secure</h2>
+                  <p class={style.infoCaption}>
+                    Worried about privacy? Images never leave your device since
+                    Squoosh does all the work locally.
+                  </p>
+                </div>
+                <div class={style.infoImgWrapper}>
+                  <img
+                    class={style.infoImg}
+                    src={secureSectionAsset}
+                    alt="silhouette of a cloud with a 'no' symbol on top"
+                    width="498"
+                    height="333"
+                  />
+                </div>
+              </div>
+            </SlideOnScroll>
+          </div>
+        </section>
+
+        <footer class={style.footer}>
+          <div class={style.footerContainer}>
+            <svg viewBox="0 0 1920 79" class={style.topWave}>
+              <path
+                d="M0 59l64-11c64-11 192-34 320-43s256-5 384 4 256 23 384 34 256 21 384 14 256-30 320-41l64-11v94H0z"
+                class={style.footerWave}
+              />
+            </svg>
+            <div class={style.footerPadding}>
+              <footer class={style.footerItems}>
+                <a
+                  class={style.footerLink}
+                  href="https://github.com/GoogleChromeLabs/squoosh/blob/dev/README.md#privacy"
+                >
+                  Privacy
+                </a>
+                <a
+                  class={style.footerLink}
+                  href="https://github.com/GoogleChromeLabs/squoosh/tree/dev/cli"
+                >
+                  Squoosh CLI
+                </a>
+                <a
+                  class={style.footerLinkWithLogo}
+                  href="https://github.com/GoogleChromeLabs/squoosh"
+                >
+                  <img src={githubLogo} alt="" width="10" height="10" />
+                  Source on Github
+                </a>
+              </footer>
+            </div>
+          </div>
+        </footer>
         {beforeInstallEvent && (
           <button class={style.installBtn} onClick={this.onInstallClick}>
             Install

src/shared/prerendered-app/Intro/style.css

@@ -118,7 +118,114 @@
   fill: var(--light-blue);
 }
 
+.bottom-wave {
+  position: relative;
+}
+
+.info {
+  background: var(--white);
+  position: relative;
+  padding: 5em 2em;
+
+  @media (min-width: 1200px) {
+    padding: 5em 0;
+  }
+}
+
+.info-container {
+  max-width: 1000px;
+  margin: 0 auto;
+}
+
+.info-content {
+  display: grid;
+  align-items: center;
+  grid-template-columns: 1fr;
+  gap: 1em;
+
+  grid-template-areas:
+    'text'
+    'img';
+
+  @media (min-width: 712px) {
+    grid-template-columns: 1fr 1fr;
+    grid-template-areas: 'text img';
+
+    .info:nth-child(even) & {
+      grid-template-areas: 'img text';
+    }
+  }
+}
+
+.info-title {
+  color: var(--pink);
+  font-size: 3em;
+  margin: 0;
+}
+
+.info-caption {
+  font-size: 1.5em;
+  line-height: 1.75;
+  margin: 1em 0 0.5em 0;
+}
+
+.info-link {
+  font-size: 1.25em;
+  text-underline-offset: 0.25em;
+  color: var(--off-black);
+  transition: color 400ms ease-in-out;
+  margin-top: 1em;
+  &:hover {
+    color: var(--dim-blue);
+  }
+}
+
+.info-text-wrapper {
+  display: flex;
+  flex-flow: column wrap;
+  max-width: 27em;
+  justify-self: center;
+  grid-area: text;
+
+  @media (min-width: 712px) {
+    justify-self: start;
+    .info:nth-child(even) & {
+      text-align: right;
+      justify-self: end;
+    }
+  }
+}
+
+.info-img-wrapper {
+  grid-area: img;
+}
+
+.info-img {
+  display: block;
+  width: 100%;
+  height: auto;
+  max-width: 400px;
+  margin: 0 auto;
+
+  @media (min-width: 768px) {
+    margin: 0 0 0 auto;
+
+    .info:nth-child(even) & {
+      margin: 0;
+    }
+  }
+}
+
+.info-wave {
+  fill: var(--white);
+}
+
 .footer {
+  background: var(--white);
+  padding-top: 5em;
+}
+
+.footer-container {
   position: relative;
   background: var(--light-gray);
 }
@@ -128,7 +235,11 @@
 }
 
 .content-padding {
-  padding: 2rem;
+  padding: 2em 0;
+}
+
+.footer-padding {
+  padding: 2em;
 }
 
 .footer-items {

src/static-build/pages/index/index.tsx

@@ -59,6 +59,7 @@ const Index: FunctionalComponent<Props> = () => (
       <link rel="shortcut icon" href={favicon} />
       <meta name="theme-color" content="#ff3385" />
       <link rel="manifest" href="/manifest.json" />
+      <link rel="canonical" href={siteOrigin} />
       <style
         dangerouslySetInnerHTML={{ __html: escapeStyleScriptContent(baseCss) }}
       />

static-build-tsconfig.json

@@ -1,7 +1,7 @@
 {
   "extends": "./generic-tsconfig.json",
   "compilerOptions": {
-    "lib": ["esnext", "dom"],
+    "lib": ["esnext", "dom", "dom.iterable"],
     "types": ["node"]
   },
   "include": ["src/shared/**/*", "src/static-build/**/*"]