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Implement download/copy ImageFrame layer output (#1194)

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* Implement download/copy ImageFrame layer output

* Add note about black transparency when copying

* Introspect node graph output type to conditionally disable the download button

---------

Co-authored-by: Dennis Kobert <dennis@kobert.dev>
This commit is contained in:
Keavon Chambers 2023-05-03 02:09:07 -07:00
parent 1aaf2a521b
commit ebf67eaa82
17 changed files with 197 additions and 52 deletions
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22
frontend/src/utility-functions/rasterization.ts
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@ -56,6 +56,26 @@ export async function rasterizeSVG(svg: string, width: number, height: number, m
/// Convert an image source (e.g. PNG document) into pixel data, a width, and a height
export async function extractPixelData(imageData: ImageBitmapSource): Promise<ImageData> {
const canvasContext = await imageToCanvasContext(imageData);
const width = canvasContext.canvas.width;
const height = canvasContext.canvas.height;
return canvasContext.getImageData(0, 0, width, height);
}
/// Convert an image source (e.g. BMP document) into a PNG blob
export async function imageToPNG(imageData: ImageBitmapSource): Promise<Blob> {
const canvasContext = await imageToCanvasContext(imageData);
return new Promise((resolve, reject) => {
canvasContext.canvas.toBlob((pngBlob) => {
if (pngBlob) resolve(pngBlob);
else reject("Converting canvas to blob data failed in imageToPNG()");
}, "image/png");
});
}
export async function imageToCanvasContext(imageData: ImageBitmapSource): Promise<CanvasRenderingContext2D> {
// Special handling to rasterize an SVG file
let svgImageData;
if (imageData instanceof File && imageData.type === "image/svg+xml") {
@ -92,5 +112,5 @@ export async function extractPixelData(imageData: ImageBitmapSource): Promise<Im
if (!context) throw new Error("Could not create canvas context");
context.drawImage(image, 0, 0, image.width, image.height, 0, 0, width, height);
return context.getImageData(0, 0, width, height);
return context;
}