Bucket Fill is slow

[s-egge]

Filling large areas with the bucket-fill tool is slow when there are a lot of pixels. Currently, each pixel is filled individually:

    c.beginPath();
    c.fillStyle = pixelColor;
    c.fillRect(x, y, pixelLength, pixelLength);
    c.fill();

This can likely be sped up by first getting all pixels that need to be filled that are touching each other in a line and filling them all at once, and going up/down from there to check for more lines of pixels or individual pixels to fill.