mozIColorAnalyzer 编辑

toolkit/components/places/mozIColorAnalyzer.idlScriptable Provides methods to analyze colors in an image 1.0 66 Introduced Gecko 17.0 Inherits from: nsISupports Last changed in Gecko 17.0 (Firefox 17.0 / Thunderbird 17.0 / SeaMonkey 2.14)

Method overview

void findRepresentativeColor(in nsIURI imageURI, in mozIRepresentativeColorCallback callback);

Methods

findRepresentativeColor()

Given an image URI, find the most representative color for that image based on the frequency of each color. Preference is given to colors that are more interesting. It avoids the background color if it can be discerned and ignores sufficiently transparent colors.

This is intended to be used on favicon images. Larger images take longer to process, especially those with a larger number of unique colors. If imageURI points to an image that has more than 128^2 pixels, this method will fail for performance reasons before analyzing it.

void findRepresentativeColor(
  in nsIURI imageURI,
  in mozIRepresentativeColorCallback callback
);

Parameters

imageURI

A URI pointing to the image - ideally a data: URI, but any scheme that will load when setting the src attribute of a DOM img element should work.

callback

Function to call when the representative color is found or an error occurs.

Remarks

Below are some images with the result of findRepresentativeColor:

Image	Representative color
		0xB28D3A
		0x502E1E
		0x53BA3F
		0x00A400

See also

• mozIRepresentativeColorCallback
• bug 634139