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import { RefObject } from 'react';
import { bgColor, canvasSize } from './generativeFillConstants';
export interface APISuccess {
status: 'success';
urls: string[];
}
export interface APIError {
status: 'error';
message: string;
}
export class ImageUtility {
static canvasToBlob = (canvas: HTMLCanvasElement): Promise<Blob> => {
return new Promise(resolve => {
canvas.toBlob(blob => {
if (blob) {
resolve(blob);
}
}, 'image/png');
});
};
// given a square api image, get the cropped img
static getCroppedImg = (img: HTMLImageElement, width: number, height: number): HTMLCanvasElement | undefined => {
// Create a new canvas element
const canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext('2d');
if (ctx) {
// Clear the canvas
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (width < height) {
// horizontal padding, x offset
const xOffset = (canvasSize - width) / 2;
console.log(xOffset);
ctx.drawImage(img, xOffset, 0, canvas.width, canvas.height, 0, 0, canvas.width, canvas.height);
} else {
// vertical padding, y offset
const yOffset = (canvasSize - height) / 2;
ctx.drawImage(img, 0, yOffset, canvas.width, canvas.height, 0, 0, canvas.width, canvas.height);
}
return canvas;
}
};
static convertImageToCanvasDataURL = async (imageSrc: string, width: number, height: number): Promise<string> => {
return new Promise<string>((resolve, reject) => {
const img = new Image();
img.onload = () => {
const canvas = this.getCroppedImg(img, width, height);
if (canvas) {
const dataUrl = canvas.toDataURL();
resolve(dataUrl);
}
};
img.onerror = error => {
reject(error);
};
img.src = imageSrc;
});
};
static getEdit = async (imgBlob: Blob, maskBlob: Blob, prompt: string, n?: number): Promise<APISuccess | APIError> => {
const apiUrl = 'https://api.openai.com/v1/images/edits';
const fd = new FormData();
fd.append('image', imgBlob, 'image.png');
fd.append('mask', maskBlob, 'mask.png');
fd.append('prompt', prompt);
fd.append('size', '512x512');
fd.append('n', n ? JSON.stringify(n) : '1');
fd.append('response_format', 'b64_json');
try {
const res = await fetch(apiUrl, {
method: 'POST',
headers: {
Authorization: `Bearer ${process.env.OPENAI_KEY}`,
},
body: fd,
});
const data = await res.json();
console.log(data.data);
return {
status: 'success',
urls: (data.data as { b64_json: string }[]).map(data => `data:image/png;base64,${data.b64_json}`),
};
} catch (err) {
console.log(err);
return { status: 'error', message: 'API error.' };
}
};
static mockGetEdit = async (mockSrc: string): Promise<APISuccess | APIError> => {
return {
status: 'success',
urls: [mockSrc, mockSrc, mockSrc],
};
};
static getCanvasContext = (canvasRef: RefObject<HTMLCanvasElement>): CanvasRenderingContext2D | null => {
if (!canvasRef.current) return null;
const ctx = canvasRef.current.getContext('2d');
if (!ctx) return null;
return ctx;
};
static downloadCanvas = (canvas: HTMLCanvasElement) => {
const url = canvas.toDataURL();
const downloadLink = document.createElement('a');
downloadLink.href = url;
downloadLink.download = 'canvas';
downloadLink.click();
downloadLink.remove();
};
static downloadImageCanvas = (imgUrl: string) => {
const img = new Image();
img.src = imgUrl;
img.onload = () => {
const canvas = document.createElement('canvas');
canvas.width = canvasSize;
canvas.height = canvasSize;
const ctx = canvas.getContext('2d');
ctx?.drawImage(img, 0, 0, canvasSize, canvasSize);
this.downloadCanvas(canvas);
};
};
static clearCanvas = (canvasRef: React.RefObject<HTMLCanvasElement>) => {
const ctx = this.getCanvasContext(canvasRef);
if (!ctx || !canvasRef.current) return;
ctx.clearRect(0, 0, canvasRef.current.width, canvasRef.current.height);
};
static drawImgToCanvas = (img: HTMLImageElement, canvasRef: React.RefObject<HTMLCanvasElement>, width: number, height: number) => {
const drawImg = (img: HTMLImageElement) => {
const ctx = this.getCanvasContext(canvasRef);
if (!ctx) return;
ctx.globalCompositeOperation = 'source-over';
ctx.clearRect(0, 0, width, height);
ctx.drawImage(img, 0, 0, width, height);
};
if (img.complete) {
drawImg(img);
} else {
console.log('loading image');
img.onload = () => {
drawImg(img);
};
}
};
// The image must be loaded!
static getCanvasMask = (srcCanvas: HTMLCanvasElement): HTMLCanvasElement | undefined => {
const canvas = document.createElement('canvas');
canvas.width = canvasSize;
canvas.height = canvasSize;
const ctx = canvas.getContext('2d');
if (!ctx) return;
ctx?.clearRect(0, 0, canvasSize, canvasSize);
ctx.fillStyle = bgColor;
ctx.fillRect(0, 0, canvasSize, canvasSize);
// extract and set padding data
if (srcCanvas.height > srcCanvas.width) {
// horizontal padding, x offset
const xOffset = (canvasSize - srcCanvas.width) / 2;
ctx?.clearRect(xOffset, 0, srcCanvas.width, srcCanvas.height);
ctx.drawImage(srcCanvas, xOffset, 0, srcCanvas.width, srcCanvas.height);
} else {
// vertical padding, y offset
const yOffset = (canvasSize - srcCanvas.height) / 2;
ctx?.clearRect(0, yOffset, srcCanvas.width, srcCanvas.height);
ctx.drawImage(srcCanvas, 0, yOffset, srcCanvas.width, srcCanvas.height);
}
return canvas;
};
// The image must be loaded!
static getCanvasImg = (img: HTMLImageElement): HTMLCanvasElement | undefined => {
const canvas = document.createElement('canvas');
canvas.width = canvasSize;
canvas.height = canvasSize;
const ctx = canvas.getContext('2d');
if (!ctx) return;
// fix scaling
const scale = Math.min(canvasSize / img.width, canvasSize / img.height);
const width = img.width * scale;
const height = img.height * scale;
ctx?.clearRect(0, 0, canvasSize, canvasSize);
ctx.fillStyle = bgColor;
ctx.fillRect(0, 0, canvasSize, canvasSize);
// extract and set padding data
if (img.naturalHeight > img.naturalWidth) {
// horizontal padding, x offset
const xOffset = (canvasSize - width) / 2;
ctx.drawImage(img, xOffset, 0, width, height);
} else {
// vertical padding, y offset
const yOffset = (canvasSize - height) / 2;
ctx.drawImage(img, 0, yOffset, width, height);
}
return canvas;
};
}
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