change api and fix incorrect caclulation

i changed the api to not have a global wasm instance anymore. now
initWasm returns a WASM instance you have to pass down to the functions.
i feel like this is the best as it means you wont deal with a race
condition if you're messing with it more then once at the same time,
like i'm doing with tests.

i also accounted for the height given as that was the original
calculation that the Blurhash C implmentation used, not width * width,
width * height.
This commit is contained in:
Fries 2023-08-21 18:58:23 -07:00
parent c84aa5cb2c
commit 548ef52ab7
8 changed files with 419 additions and 45 deletions

1
.gitignore vendored
View file

@ -2,3 +2,4 @@ node_modules
src/blurhash-decode.wasm src/blurhash-decode.wasm
dist dist
*.tgz *.tgz
coverage

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@ -14,3 +14,5 @@ pnpm-lock.yaml
rollup.config.js rollup.config.js
tsconfig.json tsconfig.json
spec spec
coverage
.nycrc

6
.nycrc Normal file
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@ -0,0 +1,6 @@
{
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"exclude": [
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}

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@ -1,14 +1,15 @@
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"description": "A WASM module using the Blurhash C library", "description": "A WASM module using the Blurhash C library",
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resolution: {integrity: sha512-IJ4uwUTi2qCccrioU6g9g/5rvvVl13bsdczUUcqbciD9iLr095yj8DQKdObriEvuNSx325N1rV1O0sJFszx75g==} resolution: {integrity: sha512-IJ4uwUTi2qCccrioU6g9g/5rvvVl13bsdczUUcqbciD9iLr095yj8DQKdObriEvuNSx325N1rV1O0sJFszx75g==}
engines: {node: 14 || >=16.14} engines: {node: 14 || >=16.14}
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engines: {node: '>=10'}
dependencies:
yallist: 4.0.0
dev: true
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engines: {node: '>=10'}
dependencies:
semver: 7.5.4
dev: true
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dependencies:
brace-expansion: 1.1.11
dev: true
/minimatch@9.0.3: /minimatch@9.0.3:
resolution: {integrity: sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==} resolution: {integrity: sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==}
engines: {node: '>=16 || 14 >=14.17'} engines: {node: '>=16 || 14 >=14.17'}
@ -263,6 +448,36 @@ packages:
engines: {node: '>=16 || 14 >=14.17'} engines: {node: '>=16 || 14 >=14.17'}
dev: true dev: true
/once@1.4.0:
resolution: {integrity: sha512-lNaJgI+2Q5URQBkccEKHTQOPaXdUxnZZElQTZY0MFUAuaEqe1E+Nyvgdz/aIyNi6Z9MzO5dv1H8n58/GELp3+w==}
dependencies:
wrappy: 1.0.2
dev: true
/p-limit@3.1.0:
resolution: {integrity: sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ==}
engines: {node: '>=10'}
dependencies:
yocto-queue: 0.1.0
dev: true
/p-locate@5.0.0:
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engines: {node: '>=10'}
dependencies:
p-limit: 3.1.0
dev: true
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engines: {node: '>=8'}
dev: true
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engines: {node: '>=0.10.0'}
dev: true
/path-key@3.1.1: /path-key@3.1.1:
resolution: {integrity: sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==} resolution: {integrity: sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==}
engines: {node: '>=8'} engines: {node: '>=8'}
@ -285,6 +500,11 @@ packages:
engines: {node: '>=8.6'} engines: {node: '>=8.6'}
dev: true dev: true
/require-directory@2.1.1:
resolution: {integrity: sha512-fGxEI7+wsG9xrvdjsrlmL22OMTTiHRwAMroiEeMgq8gzoLC/PQr7RsRDSTLUg/bZAZtF+TVIkHc6/4RIKrui+Q==}
engines: {node: '>=0.10.0'}
dev: true
/resolve@1.22.4: /resolve@1.22.4:
resolution: {integrity: sha512-PXNdCiPqDqeUou+w1C2eTQbNfxKSuMxqTCuvlmmMsk1NWHL5fRrhY6Pl0qEYYc6+QqGClco1Qj8XnjPego4wfg==} resolution: {integrity: sha512-PXNdCiPqDqeUou+w1C2eTQbNfxKSuMxqTCuvlmmMsk1NWHL5fRrhY6Pl0qEYYc6+QqGClco1Qj8XnjPego4wfg==}
hasBin: true hasBin: true
@ -294,6 +514,13 @@ packages:
supports-preserve-symlinks-flag: 1.0.0 supports-preserve-symlinks-flag: 1.0.0
dev: true dev: true
/rimraf@3.0.2:
resolution: {integrity: sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==}
hasBin: true
dependencies:
glob: 7.2.3
dev: true
/rollup@3.28.0: /rollup@3.28.0:
resolution: {integrity: sha512-d7zhvo1OUY2SXSM6pfNjgD5+d0Nz87CUp4mt8l/GgVP3oBsPwzNvSzyu1me6BSG9JIgWNTVcafIXBIyM8yQ3yw==} resolution: {integrity: sha512-d7zhvo1OUY2SXSM6pfNjgD5+d0Nz87CUp4mt8l/GgVP3oBsPwzNvSzyu1me6BSG9JIgWNTVcafIXBIyM8yQ3yw==}
engines: {node: '>=14.18.0', npm: '>=8.0.0'} engines: {node: '>=14.18.0', npm: '>=8.0.0'}
@ -302,6 +529,14 @@ packages:
fsevents: 2.3.2 fsevents: 2.3.2
dev: true dev: true
/semver@7.5.4:
resolution: {integrity: sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==}
engines: {node: '>=10'}
hasBin: true
dependencies:
lru-cache: 6.0.0
dev: true
/shebang-command@2.0.0: /shebang-command@2.0.0:
resolution: {integrity: sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==} resolution: {integrity: sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==}
engines: {node: '>=8'} engines: {node: '>=8'}
@ -314,6 +549,10 @@ packages:
engines: {node: '>=8'} engines: {node: '>=8'}
dev: true dev: true
/signal-exit@3.0.7:
resolution: {integrity: sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==}
dev: true
/signal-exit@4.1.0: /signal-exit@4.1.0:
resolution: {integrity: sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==} resolution: {integrity: sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==}
engines: {node: '>=14'} engines: {node: '>=14'}
@ -351,11 +590,27 @@ packages:
ansi-regex: 6.0.1 ansi-regex: 6.0.1
dev: true dev: true
/supports-color@7.2.0:
resolution: {integrity: sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==}
engines: {node: '>=8'}
dependencies:
has-flag: 4.0.0
dev: true
/supports-preserve-symlinks-flag@1.0.0: /supports-preserve-symlinks-flag@1.0.0:
resolution: {integrity: sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==} resolution: {integrity: sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==}
engines: {node: '>= 0.4'} engines: {node: '>= 0.4'}
dev: true dev: true
/test-exclude@6.0.0:
resolution: {integrity: sha512-cAGWPIyOHU6zlmg88jwm7VRyXnMN7iV68OGAbYDk/Mh/xC/pzVPlQtY6ngoIH/5/tciuhGfvESU8GrHrcxD56w==}
engines: {node: '>=8'}
dependencies:
'@istanbuljs/schema': 0.1.3
glob: 7.2.3
minimatch: 3.1.2
dev: true
/tslib@2.6.1: /tslib@2.6.1:
resolution: {integrity: sha512-t0hLfiEKfMUoqhG+U1oid7Pva4bbDPHYfJNiB7BiIjRkj1pyC++4N3huJfqY6aRH6VTB0rvtzQwjM4K6qpfOig==} resolution: {integrity: sha512-t0hLfiEKfMUoqhG+U1oid7Pva4bbDPHYfJNiB7BiIjRkj1pyC++4N3huJfqY6aRH6VTB0rvtzQwjM4K6qpfOig==}
dev: true dev: true
@ -366,6 +621,15 @@ packages:
hasBin: true hasBin: true
dev: true dev: true
/v8-to-istanbul@9.1.0:
resolution: {integrity: sha512-6z3GW9x8G1gd+JIIgQQQxXuiJtCXeAjp6RaPEPLv62mH3iPHPxV6W3robxtCzNErRo6ZwTmzWhsbNvjyEBKzKA==}
engines: {node: '>=10.12.0'}
dependencies:
'@jridgewell/trace-mapping': 0.3.19
'@types/istanbul-lib-coverage': 2.0.4
convert-source-map: 1.9.0
dev: true
/which@2.0.2: /which@2.0.2:
resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==} resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==}
engines: {node: '>= 8'} engines: {node: '>= 8'}
@ -391,3 +655,39 @@ packages:
string-width: 5.1.2 string-width: 5.1.2
strip-ansi: 7.1.0 strip-ansi: 7.1.0
dev: true dev: true
/wrappy@1.0.2:
resolution: {integrity: sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==}
dev: true
/y18n@5.0.8:
resolution: {integrity: sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==}
engines: {node: '>=10'}
dev: true
/yallist@4.0.0:
resolution: {integrity: sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==}
dev: true
/yargs-parser@21.1.1:
resolution: {integrity: sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==}
engines: {node: '>=12'}
dev: true
/yargs@17.7.2:
resolution: {integrity: sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==}
engines: {node: '>=12'}
dependencies:
cliui: 8.0.1
escalade: 3.1.1
get-caller-file: 2.0.5
require-directory: 2.1.1
string-width: 4.2.3
y18n: 5.0.8
yargs-parser: 21.1.1
dev: true
/yocto-queue@0.1.0:
resolution: {integrity: sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==}
engines: {node: '>=10'}
dev: true

View file

@ -9,7 +9,7 @@ const dirname = path.dirname(url.fileURLToPath(import.meta.url));
export default [ export default [
defineConfig({ defineConfig({
plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })], plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })],
input: path.resolve(dirname, "src/library.ts"), input: path.resolve(dirname, "src/blurhash-c-wasm.ts"),
output: [ output: [
{ {
name: "blurhash-c-wasm", name: "blurhash-c-wasm",
@ -22,7 +22,7 @@ export default [
}), }),
defineConfig({ defineConfig({
plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })], plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })],
input: path.resolve(dirname, "src/library.ts"), input: path.resolve(dirname, "src/blurhash-c-wasm.ts"),
output: [ output: [
{ {
name: "blurhash-c-wasm", name: "blurhash-c-wasm",

View file

@ -3,48 +3,102 @@
import * as blurhash from "../dist/blurhash-c-wasm.js"; import * as blurhash from "../dist/blurhash-c-wasm.js";
describe("blurhash-c-wasm tests", () => { describe("blurhash-c-wasm tests", () => {
/** @type {import("../dist/blurhash-c-wasm").BlurhashInstanceType} */
let instance;
beforeAll(async () => { beforeAll(async () => {
await blurhash.initWasm(); instance =
/** @type {import("../dist/blurhash-c-wasm").BlurhashInstanceType} */ (
/** @type {unknown} */ await blurhash.initWasm()
);
}); });
it("detects valid blurhash", () => { it("detects valid blurhash", () => {
expect(blurhash.isValidBlurhash("LEHLk~WB2yk8pyo0adR*.7kCMdnj")).toBe(true); expect(
expect(blurhash.isValidBlurhash("LGF5]+Yk^6#M@-5c,1J5@[or[Q6.")).toBe(true); blurhash.isValidBlurhash(instance, "LEHLk~WB2yk8pyo0adR*.7kCMdnj")
expect(blurhash.isValidBlurhash("L6PZfSjE.AyE_3t7t7R**0o#DgR4")).toBe(true); ).toBe(true);
expect(blurhash.isValidBlurhash("LKO2:N%2Tw=w]~RBVZRi};RPxuwH")).toBe(true); expect(
blurhash.isValidBlurhash(instance, "LGF5]+Yk^6#M@-5c,1J5@[or[Q6.")
).toBe(true);
expect(
blurhash.isValidBlurhash(instance, "L6PZfSjE.AyE_3t7t7R**0o#DgR4")
).toBe(true);
expect(
blurhash.isValidBlurhash(instance, "LKO2:N%2Tw=w]~RBVZRi};RPxuwH")
).toBe(true);
}); });
it("generates valid blurhash images", () => { it("generates valid 1:1 blurhash images", () => {
expect(blurhash.decode("LEHLk~WB2yk8pyo0adR*.7kCMdnj", 1, 1)).toEqual( expect(
Uint8ClampedArray.of(134, 164, 176, 255) blurhash.decode(instance, "LEHLk~WB2yk8pyo0adR*.7kCMdnj", 1, 1)
); ).toEqual(Uint8ClampedArray.of(134, 164, 176, 255));
expect(blurhash.decode("LGF5]+Yk^6#M@-5c,1J5@[or[Q6.", 1, 1)).toEqual( expect(
Uint8ClampedArray.of(176, 118, 163, 255) blurhash.decode(instance, "LGF5]+Yk^6#M@-5c,1J5@[or[Q6.", 1, 1)
); ).toEqual(Uint8ClampedArray.of(176, 118, 163, 255));
expect(blurhash.decode("L6PZfSjE.AyE_3t7t7R**0o#DgR4", 1, 1)).toEqual( expect(
Uint8ClampedArray.of(229, 228, 226, 255) blurhash.decode(instance, "L6PZfSjE.AyE_3t7t7R**0o#DgR4", 1, 1)
); ).toEqual(Uint8ClampedArray.of(229, 228, 226, 255));
expect(blurhash.decode("LKO2:N%2Tw=w]~RBVZRi};RPxuwH", 1, 1)).toEqual( expect(
Uint8ClampedArray.of(251, 192, 161, 255) blurhash.decode(instance, "LKO2:N%2Tw=w]~RBVZRi};RPxuwH", 1, 1)
); ).toEqual(Uint8ClampedArray.of(251, 192, 161, 255));
});
it("generates valid non 1:1 blurhash images", () => {
expect(
blurhash.decode(instance, "LEHLk~WB2yk8pyo0adR*.7kCMdnj", 1, 2)
).toEqual(Uint8ClampedArray.of(134, 164, 176, 255, 119, 148, 161, 255));
expect(
blurhash.decode(instance, "LGF5]+Yk^6#M@-5c,1J5@[or[Q6.", 1, 2)
).toEqual(Uint8ClampedArray.of(176, 118, 163, 255, 137, 155, 177, 255));
expect(
blurhash.decode(instance, "L6PZfSjE.AyE_3t7t7R**0o#DgR4", 1, 2)
).toEqual(Uint8ClampedArray.of(229, 228, 226, 255, 226, 223, 223, 255));
expect(
blurhash.decode(instance, "LKO2:N%2Tw=w]~RBVZRi};RPxuwH", 1, 2)
).toEqual(Uint8ClampedArray.of(251, 192, 161, 255, 200, 187, 180, 255));
}); });
it("detects invalid blurhash", () => { it("detects invalid blurhash", () => {
expect(blurhash.isValidBlurhash("1234")).toBe(false); expect(blurhash.isValidBlurhash(instance, "1234")).toBe(false);
expect(blurhash.isValidBlurhash("sus")).toBe(false); expect(blurhash.isValidBlurhash(instance, "sus")).toBe(false);
});
it("fails on invalid blurhash", () => {
const decodingHasFailed = "Decoding the Blurhash string has failed.";
expect(() => blurhash.decode(instance, "1234", 1, 1)).toThrow(
new Error(decodingHasFailed)
);
expect(() => blurhash.decode(instance, "sus", 1, 1)).toThrow(
new Error(decodingHasFailed)
);
});
it("don't accept less then the required parameters in the isValidBlurhash function", () => {
// @ts-expect-error
expect(() => blurhash.isValidBlurhash(undefined)).toThrow(
new Error("You are required to give the WASM Module.")
);
// @ts-expect-error
expect(() => blurhash.isValidBlurhash(instance, undefined)).toThrow(
new Error("You are required to give the Blurhash string.")
);
}); });
it("don't accept less then the required paramaters in the decode function", () => { it("don't accept less then the required paramaters in the decode function", () => {
// @ts-expect-error // @ts-expect-error
expect(() => blurhash.decode(undefined)).toThrow( expect(() => blurhash.decode(undefined)).toThrow(
new Error("You are required to give the WASM Module.")
);
// @ts-expect-error
expect(() => blurhash.decode(instance, undefined)).toThrow(
new Error("You are required to give the Blurhash string.") new Error("You are required to give the Blurhash string.")
); );
// @ts-expect-error // @ts-expect-error
expect(() => blurhash.decode("test")).toThrow( expect(() => blurhash.decode(instance, "test")).toThrow(
new Error("You are required to give the width.") new Error("You are required to give the width.")
); );
// @ts-expect-error // @ts-expect-error
expect(() => blurhash.decode("test", 32)).toThrow( expect(() => blurhash.decode(instance, "test", 32)).toThrow(
new Error("You are required to give the height.") new Error("You are required to give the height.")
); );
}); });

View file

@ -1,7 +1,7 @@
// @ts-ignore // @ts-ignore
import wasm from "./blurhash-decode.wasm"; import wasm from "./blurhash-decode.wasm";
type InstanceType = { export type BlurhashInstanceType = {
memory: WebAssembly.Memory; memory: WebAssembly.Memory;
malloc: (bytes: number) => number; malloc: (bytes: number) => number;
free: (ptr: number) => void; free: (ptr: number) => void;
@ -16,16 +16,16 @@ type InstanceType = {
isValidBlurhash: (stringPtr: number) => number; isValidBlurhash: (stringPtr: number) => number;
}; };
const wasmInitializationError = "The WASM module has not been initialized";
const failed = -1; const failed = -1;
const youAreRequiredToGiveThe = (thing: string) => const youAreRequiredToGiveThe = (thing: string) =>
`You are required to give the ${thing}.`; `You are required to give the ${thing}.`;
const blurHashStringRequiredError = youAreRequiredToGiveThe("Blurhash string"); const blurhashStringRequiredError = youAreRequiredToGiveThe("Blurhash string");
let wasmInstance: WebAssembly.Instance | undefined; const wasmMissingError = youAreRequiredToGiveThe("WASM Module");
let instance: InstanceType | undefined;
function encodeStringToWasmArray(string: string): number { function encodeStringToWasmArray(
if (!instance) throw Error(wasmInitializationError); instance: BlurhashInstanceType,
string: string
): number {
const encoder = new TextEncoder(); const encoder = new TextEncoder();
const encodedString = encoder.encode(string); const encodedString = encoder.encode(string);
const stringPtr: number = instance.malloc(encodedString.byteLength + 1); const stringPtr: number = instance.malloc(encodedString.byteLength + 1);
@ -42,49 +42,55 @@ function encodeStringToWasmArray(string: string): number {
} }
/** /**
* Initialize the WASM instance. This is to support browsers without top level await. * Initialize a WASM instance.
* @returns A Blurhash WASM instance.
*/ */
export async function initWasm() { export async function initWasm(): Promise<BlurhashInstanceType> {
wasmInstance = await WebAssembly.instantiate( const wasmInstance = await WebAssembly.instantiate(
(await wasm()) as WebAssembly.Module, (await wasm()) as WebAssembly.Module,
{ {
env: { env: {
// stub for a emscripten import // stub for a emscripten import
/* c8 ignore next */
emscripten_notify_memory_growth: () => {}, emscripten_notify_memory_growth: () => {},
}, },
} }
); );
instance = wasmInstance.exports as InstanceType; return wasmInstance.exports as unknown as BlurhashInstanceType;
} }
/** /**
* Decode a Blurhash string into a Pixel Array that you can use to generate a Blurhash image. * Decode a Blurhash string into a Pixel Array that you can use to generate a Blurhash image.
* @param instance A Blurhash WASM instance.
* @param blurhashString A valid Blurhash string. * @param blurhashString A valid Blurhash string.
* @param width The width of the image you want to generate. * @param width The width of the image you want to generate.
* @param height The height of the image you want to generate. * @param height The height of the image you want to generate.
* @returns A `Uint8ClampedArray` pixel array. * @returns A `Uint8ClampedArray` pixel array.
*/ */
export function decode( export function decode(
instance: BlurhashInstanceType,
blurhashString: string, blurhashString: string,
width: number, width: number,
height: number height: number
): Uint8ClampedArray { ): Uint8ClampedArray {
if (!instance) throw Error(wasmInitializationError); if (!instance) throw Error(wasmMissingError);
if (!blurhashString) { if (!blurhashString) {
throw Error(blurHashStringRequiredError); throw Error(blurhashStringRequiredError);
} }
if (!width) { if (!width) {
throw Error(youAreRequiredToGiveThe("width")); throw Error(youAreRequiredToGiveThe("width"));
} }
if (!height) { if (!height) {
throw Error(youAreRequiredToGiveThe("height")); throw Error(youAreRequiredToGiveThe("height"));
} }
const pixelsPtrSize = width * 4 * width; const pixelsPtrSize = width * 4 * height;
const pixelsPtr = instance.malloc(pixelsPtrSize); const pixelsPtr = instance.malloc(pixelsPtrSize);
const stringPtr = encodeStringToWasmArray(blurhashString); const stringPtr = encodeStringToWasmArray(instance, blurhashString);
const result = instance.decodeToArray( const result = instance.decodeToArray(
stringPtr, stringPtr,
@ -118,14 +124,17 @@ export function decode(
* @param blurhashString A Blurhash string. * @param blurhashString A Blurhash string.
* @returns `true` if your string is valid, `false` elsewise. * @returns `true` if your string is valid, `false` elsewise.
*/ */
export function isValidBlurhash(blurhashString: string) { export function isValidBlurhash(
if (!instance) throw Error(wasmInitializationError); instance: BlurhashInstanceType,
blurhashString: string
) {
if (!instance) throw Error(wasmMissingError);
if (!blurhashString) { if (!blurhashString) {
throw Error(blurHashStringRequiredError); throw Error(blurhashStringRequiredError);
} }
const stringPtr = encodeStringToWasmArray(blurhashString); const stringPtr = encodeStringToWasmArray(instance, blurhashString);
const result: number = instance.isValidBlurhash(stringPtr); const result: number = instance.isValidBlurhash(stringPtr);
instance.free(stringPtr); instance.free(stringPtr);
return Boolean(result); return Boolean(result);