picoe/Eto

RAW loading slow on WPF

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#1,863 opened on Jan 4, 2021

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help wanted

Description

Hi Curtis,

I need to process RAW-Images from various cameras.

On the Mac-side, RAW-support is already included in macOS, so we can just open them with  var bmp = new Eto.Drawing.Bitmap(file);   On the Windows-side, there is an extension available: https://www.microsoft.com/en-us/p/raw-image-extension/9nctdw2w1bh8?activetab=pivot:overviewtab

Then just loading the raw into a new Eto.Drawing.Bitmap(file) also works. But its ultra slow...

Where Eto.Mac needs less then a second for a certain image, the same image in Eto.Wpf takes 5 sec to load. I'm not very familiar with bitmap handling in Wpf, thats why I'm asking you, if there might be a faster way then Eto.Wpf is doing it now.

Contributor guide

Tech stack
csharp
Domain
desktopperformance
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C#WPF
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Investigate how Eto.Wpf currently loads RAW images via Bitmap. Compare with Eto.Mac's performance. Consider using Windows Imaging Component (WIC) for faster decoding. Look at relevant files in Eto.Wpf such as BitmapHandler or Bitmap.cs. Check if the slowdown is due to format conversion or loading into memory.