change up api, and bump down version

the api now requires you to call an async function initWasm to make the
functions work instead of using top level await. i also optimized the
wasm module to have O3 and fast-math (which the original blurhash
makefile had and the results do seem to be the same with the javascript
blurhash).

I also gave the wasm instance functions inside typescript types and i
fixed a bug where i didnt free the pointers in order so if you called
decode too many times, you will run out of memory.
This commit is contained in:
Fries 2023-08-14 19:24:20 -07:00
parent bb4f5b32e8
commit f7bbb92d85
14 changed files with 184 additions and 1012 deletions

3
.clang-format Normal file
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@ -0,0 +1,3 @@
BasedOnStyle: WebKit
UseTab: Always
TabWidth: 4

1
.gitignore vendored
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@ -1,3 +1,4 @@
node_modules
src/blurhash-decode.wasm
dist
*.tgz

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@ -1,4 +1,15 @@
node_modules
blurhash
*.tgz
blurhash/*.c
blurhash/*.h
src
.clang-format
.editorconfig
.gitignore
.npmignore
.npmrc
.prettierrc.json
Makefile
pnpm-lock.yaml
rollup.config.js
tsconfig.json

1
.npmrc Normal file
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@ -0,0 +1 @@
@fries:registry=https://git.fries.gay/api/packages/fries/npm/

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@ -1,6 +1,6 @@
LIBRARY=src/blurhash-decode.wasm
$(LIBRARY): blurhash/decode.c
emcc --no-entry -Wl,--export,decodeToArray -Wl,--export,malloc -Wl,--export,free -Wl,--export,isValidBlurhash -o $@ blurhash/decode.c
emcc -ffast-math -O3 --no-entry -Wl,--export,decodeToArray -Wl,--export,malloc -Wl,--export,free -Wl,--export,isValidBlurhash -o $@ blurhash/decode.c
.PHONY: clean
clean:

View file

@ -1,25 +1,32 @@
#ifndef __BLURHASH_COMMON_H__
#define __BLURHASH_COMMON_H__
#include<math.h>
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
static inline int linearTosRGB(float value) {
static inline int linearTosRGB(float value)
{
float v = fmaxf(0, fminf(1, value));
if(v <= 0.0031308) return v * 12.92 * 255 + 0.5;
else return (1.055 * powf(v, 1 / 2.4) - 0.055) * 255 + 0.5;
if (v <= 0.0031308)
return v * 12.92 * 255 + 0.5;
else
return (1.055 * powf(v, 1 / 2.4) - 0.055) * 255 + 0.5;
}
static inline float sRGBToLinear(int value) {
static inline float sRGBToLinear(int value)
{
float v = (float)value / 255;
if(v <= 0.04045) return v / 12.92;
else return powf((v + 0.055) / 1.055, 2.4);
if (v <= 0.04045)
return v / 12.92;
else
return powf((v + 0.055) / 1.055, 2.4);
}
static inline float signPow(float value, float exp) {
static inline float signPow(float value, float exp)
{
return copysignf(powf(fabsf(value), exp), value);
}

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@ -4,54 +4,58 @@
static char chars[83] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~";
static inline uint8_t clampToUByte(int * src) {
if( *src >= 0 && *src <= 255 )
static inline uint8_t clampToUByte(int* src)
{
if (*src >= 0 && *src <= 255)
return *src;
return (*src < 0) ? 0 : 255;
}
static inline uint8_t * createByteArray(int size) {
return (uint8_t *)malloc(size * sizeof(uint8_t));
}
int decodeToInt(uint8_t * string, int start, int end) {
int decodeToInt(uint8_t* string, int start, int end)
{
int value = 0, iter1 = 0, iter2 = 0;
for( iter1 = start; iter1 < end; iter1 ++) {
for (iter1 = start; iter1 < end; iter1++) {
int index = -1;
for(iter2 = 0; iter2 < 83; iter2 ++) {
for (iter2 = 0; iter2 < 83; iter2++) {
if (chars[iter2] == string[iter1]) {
index = iter2;
break;
}
}
if (index == -1) return -1;
if (index == -1)
return -1;
value = value * 83 + index;
}
return value;
}
bool isValidBlurhash(uint8_t* blurhash)
{
const int hashLength = strlen((const char*)blurhash);
bool isValidBlurhash(uint8_t * blurhash) {
const int hashLength = strlen((const char *)blurhash);
if (!blurhash || strlen((const char*)blurhash) < 6)
return false;
if (!blurhash || strlen((const char *)blurhash) < 6) return false;
// Get size from first character
int sizeFlag = decodeToInt(blurhash, 0, 1);
int sizeFlag = decodeToInt(blurhash, 0, 1); //Get size from first character
int numY = (int)floorf(sizeFlag / 9) + 1;
int numX = (sizeFlag % 9) + 1;
if (hashLength != 4 + 2 * numX * numY) return false;
if (hashLength != 4 + 2 * numX * numY)
return false;
return true;
}
void decodeDC(int value, float * r, float * g, float * b) {
*r = sRGBToLinear(value >> 16); // R-component
void decodeDC(int value, float* r, float* g, float* b)
{
*r = sRGBToLinear(value >> 16); // R-component
*g = sRGBToLinear((value >> 8) & 255); // G-Component
*b = sRGBToLinear(value & 255); // B-Component
*b = sRGBToLinear(value & 255); // B-Component
}
void decodeAC(int value, float maximumValue, float * r, float * g, float * b) {
void decodeAC(int value, float maximumValue, float* r, float* g, float* b)
{
int quantR = (int)floorf(value / (19 * 19));
int quantG = (int)floorf(value / 19) % 19;
int quantB = (int)value % 19;
@ -61,9 +65,12 @@ void decodeAC(int value, float maximumValue, float * r, float * g, float * b) {
*b = signPow(((float)quantB - 9) / 9, 2.0) * maximumValue;
}
int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nChannels, uint8_t * pixelArray) {
if (!isValidBlurhash(blurhash)) return -1;
if (punch < 1) punch = 1;
int decodeToArray(uint8_t* blurhash, int width, int height, int punch, int nChannels, uint8_t* pixelArray)
{
if (!isValidBlurhash(blurhash))
return -1;
if (punch < 1)
punch = 1;
int sizeFlag = decodeToInt(blurhash, 0, 1);
int numY = (int)floorf(sizeFlag / 9) + 1;
@ -72,17 +79,19 @@ int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nCha
float r = 0, g = 0, b = 0;
int quantizedMaxValue = decodeToInt(blurhash, 1, 2);
if (quantizedMaxValue == -1) return -1;
if (quantizedMaxValue == -1)
return -1;
float maxValue = ((float)(quantizedMaxValue + 1)) / 166;
int colors_size = numX * numY;
float colors[colors_size][3];
for(iter = 0; iter < colors_size; iter ++) {
for (iter = 0; iter < colors_size; iter++) {
if (iter == 0) {
int value = decodeToInt(blurhash, 2, 6);
if (value == -1) return -1;
if (value == -1)
return -1;
decodeDC(value, &r, &g, &b);
colors[iter][0] = r;
colors[iter][1] = g;
@ -90,7 +99,8 @@ int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nCha
} else {
int value = decodeToInt(blurhash, 4 + iter * 2, 6 + iter * 2);
if (value == -1) return -1;
if (value == -1)
return -1;
decodeAC(value, maxValue * punch, &r, &g, &b);
colors[iter][0] = r;
colors[iter][1] = g;
@ -102,13 +112,13 @@ int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nCha
int x = 0, y = 0, i = 0, j = 0;
int intR = 0, intG = 0, intB = 0;
for(y = 0; y < height; y ++) {
for(x = 0; x < width; x ++) {
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
float r = 0, g = 0, b = 0;
for(j = 0; j < numY; j ++) {
for(i = 0; i < numX; i ++) {
for (j = 0; j < numY; j++) {
for (i = 0; i < numX; i++) {
float basics = cos((M_PI * x * i) / width) * cos((M_PI * y * j) / height);
int idx = i + j * numX;
r += colors[idx][0] * basics;
@ -126,8 +136,8 @@ int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nCha
pixelArray[nChannels * x + 2 + y * bytesPerRow] = clampToUByte(&intB);
if (nChannels == 4)
pixelArray[nChannels * x + 3 + y * bytesPerRow] = 255; // If nChannels=4, treat each pixel as RGBA instead of RGB
// If nChannels=4, treat each pixel as RGBA instead of RGB
pixelArray[nChannels * x + 3 + y * bytesPerRow] = 255;
}
}

View file

@ -4,9 +4,9 @@
#include <math.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
/*
decodeToArray : Decodes the blurhash and copies the pixels to pixelArray,
@ -21,7 +21,7 @@
pixelArray : Pointer to memory region where pixels needs to be copied.
Returns : int, -1 if error 0 if successful
*/
int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nChannels, uint8_t * pixelArray);
int decodeToArray(uint8_t* blurhash, int width, int height, int punch, int nChannels, uint8_t* pixelArray);
/*
isValidBlurhash : Checks if the Blurhash is valid or not.
@ -29,6 +29,6 @@ int decodeToArray(uint8_t * blurhash, int width, int height, int punch, int nCha
blurhash : A string representing the blurhash
Returns : bool (true if it is a valid blurhash, else false)
*/
bool isValidBlurhash(uint8_t * blurhash);
bool isValidBlurhash(uint8_t* blurhash);
#endif

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@ -1,21 +1,21 @@
{
"type": "module",
"name": "@fries/blurhash-c-wasm",
"version": "1.0.0",
"description": "",
"main": "dist/library.js",
"types": "dist/library.d.ts",
"scripts": {
"build": "make && rollup -c rollup.config.js",
"prepublishOnly": "pnpm build"
},
"keywords": [],
"author": "",
"devDependencies": {
"@rollup/plugin-typescript": "^11.1.2",
"@rollup/plugin-wasm": "^6.1.3",
"rollup": "^3.28.0",
"typescript": "^5.1.6",
"tslib": "^2.6.1"
}
"type": "module",
"name": "@fries/blurhash-c-wasm",
"version": "0.1.0",
"description": "A WASM module using the Blurhash C library",
"main": "dist/blurhash-c-wasm.cjs",
"module": "dist/blurhash-c-wasm.js",
"types": "dist/library.d.ts",
"scripts": {
"build": "make && rollup -c rollup.config.js",
"prepublishOnly": "pnpm build"
},
"author": "Fries",
"devDependencies": {
"@rollup/plugin-typescript": "^11.1.2",
"@rollup/plugin-wasm": "^6.1.3",
"rollup": "^3.28.0",
"typescript": "^5.1.6",
"tslib": "^2.6.1"
}
}

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version: 5.1.6
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version: 4.4.9
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vite-plugin-top-level-await:
specifier: ^1.3.1
version: 1.3.1(rollup@3.28.0)(vite@4.4.9)
vite-plugin-wasm:
specifier: ^3.2.2
version: 3.2.2(vite@4.4.9)
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picocolors: 1.0.0
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dev: true
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dev: true
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dependencies:
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path-parse: 1.0.7
dev: true
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hasBin: true
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fsevents: 2.3.2
dev: true
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engines: {node: '>=10'}
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lru-cache: 6.0.0
dev: true
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engines: {node: '>=0.10.0'}
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engines: {node: '>=0.10.0'}
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dev: true
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engines: {node: '>=0.6.19'}
dev: true
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engines: {node: '>=8'}
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engines: {node: '>= 0.4'}
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punycode: 2.3.0
dev: true
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vite: '*'
peerDependenciesMeta:
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'@rollup/pluginutils': 5.0.2(rollup@3.28.0)
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hasBin: true
peerDependencies:
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less: '*'
lightningcss: ^1.21.0
sass: '*'
stylus: '*'
sugarss: '*'
terser: ^5.4.0
peerDependenciesMeta:
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lightningcss:
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sass:
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stylus:
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dev: true

View file

@ -1,17 +1,36 @@
import { defineConfig } from "rollup";
import path from "node:path";
import url from "node:url"
import url from "node:url";
import Typescript from "@rollup/plugin-typescript";
import Wasm from "@rollup/plugin-wasm";
const dirname = path.dirname(url.fileURLToPath(import.meta.url))
const dirname = path.dirname(url.fileURLToPath(import.meta.url));
export default defineConfig({
plugins: [Typescript(), Wasm({targetEnv: "auto-inline"})],
input: path.resolve(dirname, "src/library.ts"),
output: {
dir: "dist",
format: "es",
sourcemap: "inline"
}
})
export default [
defineConfig({
plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })],
input: path.resolve(dirname, "src/library.ts"),
output: [
{
name: "blurhash-c-wasm",
entryFileNames: "blurhash-c-wasm.js",
dir: "dist",
format: "module",
sourcemap: "inline",
},
],
}),
defineConfig({
plugins: [Typescript(), Wasm({ targetEnv: "auto-inline" })],
input: path.resolve(dirname, "src/library.ts"),
output: [
{
name: "blurhash-c-wasm",
entryFileNames: "blurhash-c-wasm.cjs",
dir: "dist",
format: "cjs",
sourcemap: "inline",
},
],
}),
];

View file

@ -3,21 +3,34 @@ import wasm from "./blurhash-decode.wasm";
type InstanceType = {
memory: WebAssembly.Memory;
malloc: CallableFunction;
free: CallableFunction;
decodeToArray: CallableFunction;
isValidBlurhash: CallableFunction;
malloc: (bytes: number) => number;
free: (ptr: number) => void;
decodeToArray: (
stringPtr: number,
width: number,
height: number,
punch: number,
nChannels: number,
pixelsArrayPtr: number
) => number;
isValidBlurhash: (stringPtr: number) => number;
};
const wasmInstance = new WebAssembly.Instance(await wasm());
const instance = wasmInstance.exports as InstanceType;
const wasmInitializationError = "The WASM module has not been initialized";
const failed = -1;
const youAreRequiredToGiveThe = (thing: string) =>
`You are required to give the ${thing}.`;
const blurHashStringRequiredError = youAreRequiredToGiveThe("Blurhash string");
let wasmInstance: WebAssembly.Instance | undefined;
let instance: InstanceType | undefined;
function encodeStringToWasmArray(string: string): number {
if (!instance) throw Error(wasmInitializationError);
const encoder = new TextEncoder();
const encodedString = encoder.encode(string);
const stringPtr: number = instance.malloc(encodedString.byteLength);
const stringBuf = new Uint8Array(
<ArrayBuffer>instance.memory.buffer,
instance.memory.buffer,
stringPtr,
encodedString.byteLength + 1
);
@ -28,6 +41,16 @@ function encodeStringToWasmArray(string: string): number {
return stringPtr;
}
/**
* Initialize the WASM instance. This is to support browsers without top level await.
*/
export async function initWasm() {
wasmInstance = await WebAssembly.instantiate(
(await wasm()) as WebAssembly.Module
);
instance = wasmInstance.exports as InstanceType;
}
/**
* Decode a Blurhash string into a Pixel Array that you can use to generate a Blurhash image.
* @param blurhashString A valid Blurhash string.
@ -40,19 +63,27 @@ export function decode(
width: number,
height: number
): Uint8ClampedArray {
if (!width || !height) {
throw Error("You are required to give the width or height.")
if (!instance) throw Error(wasmInitializationError);
if (!blurhashString) {
throw Error(blurHashStringRequiredError);
}
if (!width) {
throw Error(youAreRequiredToGiveThe("width"));
}
if (!height) {
throw Error(youAreRequiredToGiveThe("height"));
}
const pixelsPtrSize = width * 4 * width;
const pixelsPtr = instance.malloc(pixelsPtrSize);
const pixelsBuf = new Uint8ClampedArray(
<ArrayBuffer>instance.memory.buffer,
instance.memory.buffer,
pixelsPtr,
pixelsPtrSize
);
const stringPtr: number = encodeStringToWasmArray(blurhashString);
const stringPtr = encodeStringToWasmArray(blurhashString);
const result = instance.decodeToArray(
stringPtr,
@ -62,16 +93,16 @@ export function decode(
4,
pixelsPtr
);
if (result == -1) {
instance.free(pixelsPtr);
if (result == failed) {
instance.free(stringPtr);
instance.free(pixelsPtr);
throw Error("Decoding the Blurhash string has failed.");
}
const clonedBuffer = pixelsBuf.slice(0);
instance.free(pixelsPtr);
instance.free(stringPtr);
instance.free(pixelsPtr);
return clonedBuffer;
}
@ -82,6 +113,12 @@ export function decode(
* @returns `true` if your string is valid, `false` elsewise.
*/
export function isValidBlurhash(blurhashString: string) {
if (!instance) throw Error(wasmInitializationError);
if (!blurhashString) {
throw Error(blurHashStringRequiredError);
}
const stringPtr = encodeStringToWasmArray(blurhashString);
const result: number = instance.isValidBlurhash(stringPtr);
instance.free(stringPtr);

View file

@ -25,7 +25,7 @@
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "ES2022", /* Specify what module code is generated. */
"module": "ES2015", /* Specify what module code is generated. */
"rootDir": "./src", /* Specify the root folder within your source files. */
"moduleResolution": "NodeNext",
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */

View file

@ -1,27 +0,0 @@
import { defineConfig } from "vite";
import path from "node:path";
import Wasm from "vite-plugin-wasm";
import TopLevelAwait from "vite-plugin-top-level-await";
import Dts from "vite-plugin-dts";
import Typescript from "@rollup/plugin-typescript";
export default defineConfig({
plugins: [Wasm(), TopLevelAwait(), Dts()],
build: {
// lib: {
// entry: path.resolve(__dirname, "src/library.ts"),
// name: "blurhash-c-wasm",
// formats: ["es"],
// },
minify: false,
sourcemap: true,
rollupOptions: {
input: path.resolve(__dirname, "src/library.ts"),
output: {
dir: "dist",
format: "es",
sourcemap: "inline"
}
}
},
});