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magick-image-collection.ts
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magick-image-collection.ts
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// Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
// Licensed under the Apache License, Version 2.0.
import { ImageMagick } from "./image-magick.ts";
import { Exception } from "./internal/exception/exception.ts";
import { IMagickImage } from "./magick-image.ts";
import { MagickError } from "./magick-error.ts";
import { MagickFormat } from "./magick-format.ts";
import { MagickImage } from "./magick-image.ts";
import { MagickReadSettings } from "./settings/magick-read-settings.ts";
import { MagickSettings } from "./settings/magick-settings.ts";
import { Pointer } from "./internal/pointer/pointer.ts";
export interface IMagickImageCollection extends Array<IMagickImage> {
/** @internal */
_use(func: (images: IMagickImageCollection) => void): void;
/** @internal */
_use(func: (images: IMagickImageCollection) => Promise<void>): Promise<void>;
dispose(): void;
read(fileName: string, settings?: MagickReadSettings): void;
read(array: Uint8Array, settings?: MagickReadSettings): void;
write(func: (data: Uint8Array) => void, format?: MagickFormat): void;
write(
func: (data: Uint8Array) => Promise<void>,
format?: MagickFormat,
): Promise<void>;
}
export class MagickImageCollection extends Array<MagickImage>
implements IMagickImageCollection {
private constructor() {
super();
}
dispose(): void {
let image = this.pop();
while (image !== undefined) {
image.dispose();
image = this.pop();
}
}
read(fileName: string, settings?: MagickReadSettings): void;
read(array: Uint8Array, settings?: MagickReadSettings): void;
read(
fileNameOrArray: string | Uint8Array,
settings?: MagickReadSettings,
): void {
this.dispose();
Exception.use((exception) => {
const readSettings = MagickImageCollection.createSettings(settings);
if (fileNameOrArray instanceof Uint8Array) {
readSettings._use((settings) => {
const length = fileNameOrArray.byteLength;
let data = 0;
try {
data = ImageMagick._api._malloc(length);
ImageMagick._api.HEAPU8.set(fileNameOrArray, data);
const instances = ImageMagick._api._MagickImageCollection_ReadBlob(
settings._instance,
data,
0,
length,
exception.ptr,
);
this.addImages(instances, readSettings);
} finally {
if (data !== 0) {
ImageMagick._api._free(data);
}
}
});
} else {
readSettings._fileName = fileNameOrArray;
readSettings._use((settings) => {
const instances = ImageMagick._api._MagickImageCollection_ReadFile(
settings._instance,
exception.ptr,
);
this.addImages(instances, readSettings);
});
}
});
}
write(func: (data: Uint8Array) => void, format?: MagickFormat): void;
write(
func: (data: Uint8Array) => Promise<void>,
format?: MagickFormat,
): Promise<void>;
write(
func: (data: Uint8Array) => void | Promise<void>,
format?: MagickFormat,
): void | Promise<void> {
this.throwIfEmpty();
let data = 0;
let bytes = new Uint8Array();
Exception.use((exception) => {
Pointer.use((pointer) => {
const image = this[0];
const settings = this[0]._getSettings()._clone();
if (format !== undefined) {
settings.format = format;
} else {
settings.format = image.format;
}
settings._use((nativeSettings) => {
try {
this.attachImages();
data = ImageMagick._api._MagickImage_WriteBlob(
image._instance,
nativeSettings._instance,
pointer.ptr,
exception.ptr,
);
if (data !== 0) {
bytes = ImageMagick._api.HEAPU8.subarray(
data,
data + pointer.value,
);
}
} catch {
if (data !== 0) {
data = ImageMagick._api._MagickMemory_Relinquish(data);
}
} finally {
this.detachImages();
}
});
});
});
try {
let result = func(bytes);
if (!!result && typeof result.then === "function") {
result = result.finally(() => {
if (data !== 0) {
data = ImageMagick._api._MagickMemory_Relinquish(data);
}
});
}
return result;
} finally {
if (data !== 0) {
data = ImageMagick._api._MagickMemory_Relinquish(data);
}
}
}
static create(): IMagickImageCollection {
return MagickImageCollection.createObject();
}
/** @internal */
static _createFromImages(
images: number,
settings: MagickSettings,
): IMagickImageCollection {
const collection = MagickImageCollection.createObject();
collection.addImages(images, settings);
return collection;
}
/** @internal */
_use(func: (images: IMagickImageCollection) => void): void;
_use(func: (images: IMagickImageCollection) => Promise<void>): Promise<void>;
_use(
func: (images: IMagickImageCollection) => void | Promise<void>,
): void | Promise<void> {
try {
return func(this);
} finally {
this.dispose();
}
}
private addImages(images: number, settings: MagickSettings) {
settings.format = MagickFormat.Unknown;
let image = images;
while (image !== 0) {
const next = ImageMagick._api._MagickImage_GetNext(image);
ImageMagick._api._MagickImage_SetNext(image, 0);
this.push(MagickImage._createFromImage(image, settings));
image = next;
}
}
private attachImages() {
for (let i = 0; i < this.length - 1; i++) {
ImageMagick._api._MagickImage_SetNext(
this[i]._instance,
this[i + 1]._instance,
);
}
}
private static createObject(): MagickImageCollection {
return Object.create(MagickImageCollection.prototype);
}
private static createSettings(settings?: MagickReadSettings): MagickSettings {
if (settings == null) {
return new MagickSettings();
}
return new MagickReadSettings(settings);
}
private detachImages() {
for (let i = 0; i < this.length - 1; i++) {
ImageMagick._api._MagickImage_SetNext(this[i]._instance, 0);
}
}
private throwIfEmpty() {
if (this.length === 0) {
throw new MagickError("operation requires at least one image");
}
}
}