QuantizeProcessor does not use sourceRectangle

[Jjagg]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

Description

Title says it all. The OnFrameApply method in QuantizeProcessor does not use the sourceRectangle it gets.

To resolve this the following methods need to support a sourceRectangle:

• IFrameQuantizer<TPixel>.QuantizeFrame
• FrameQuantizerBase<TPixel>.FirstPass and SecondPass

System Configuration

• ImageSharp version: 0d179d6

[JimBobSquarePants]

I forgot we'd added this functionality. Closing now.