498 questions
1
vote
0
answers
22
views
ImageSource updating in Image component => empty image, when launched from tablet
I can't update an Image in a MAUI for Android app : the previous image is replaced by a white box. I use .NET 9.
Here is the code to update the whole component:
[RelayCommand]
public async Task My(...
- 1,707
0
votes
0
answers
54
views
when I upgrade MAUI to version 9, I get this error message : The type or namespace name 'MauiWinUIApplication' could not be found
I have built a demo projet just to display a bitmap with Skiasharp.
Nothing special :
public partial class MainPage : ContentPage
{
SKBitmap mybitmap;
public MainPage()
{
...
- 332
0
votes
1
answer
22
views
SKImage loading image but drawing it as blue, when it has yellow color
Issue
When drawing a PNG image, it is drawn with a blue tint.
Code
updated to include how the canvas is created
SKImageInfo info = new SKImageInfo(2000, 2000);
SKBitmap bitmap = new SKBitmap(info);
...
- 6,274
1
vote
1
answer
84
views
(SOLVED) System.NotSupportedException and System.Reflection.TargetInvocationException while implementing SkiaSharp in .net Maui
Hello i was implementing skiasharp on .net 8.0 Maui and i constantly receive System.NotSupportedException and System.Reflection.TargetInvocationException. I am trying to understand why i keep ...
1
vote
1
answer
170
views
.NET MAUI SkiaSharp SKCanvasView crash when size > 0
this is my first .NET Maui-App and I hope this is the right place to ask.
Right now I have problems using a SKCanvasView from SkiaSharp (Version 3.0.0-preview.4.1) in .NET 8 on Windows 11.
Despite ...
- 13
0
votes
0
answers
39
views
Amazon Linux 2023 and SkiaSharp compatibility issues
My Project is .net core 6 MVC，I use the SkiaSharp package for image compression，The program code is as follows，The version of the relevant installation package is SkiaSharp(2.88.8)、 SkiaSharp....
- 3
0
votes
0
answers
32
views
OxyPlot.SkiaSharp.Wpf zooming if using a touchscreen
I am using a PlotView from OxyPlot.SkiaSharp.Wpf in a WPF application running on a touchscreen device. How can I zoom?
I know that I can zoom with a mouse using the scroll wheel, +/- keys or using the ...
- 405
1
vote
2
answers
101
views
How to convert an ImageSharp Image<> to a SkiaSharp SkImage?
I've got an ImageSharp Image<Rgb24> image which is already loaded in memory, and I need to convert it into a SkiaSharp SkImage object to pass into a library that I'm using. I'd like to use the ...
- 595
2
votes
1
answer
102
views
Decoding an Image with SkiaSharp Results in 90% Black Image
As described in this question, I'm working with the Fortnite API to retrieve an image of their map and some coordinates to place a point on that map. Here's the map image, for reference. As shown in ...
- 12.6k
0
votes
1
answer
326
views
How to draw Skia Svg Path with stroke and fill, but with different stroke color
I want to draw a path using skia in my maui project, but I want to use a different color for the stroke then for the fill, for example I want to draw some path with a black border and filled with red.
...
- 12k
0
votes
0
answers
92
views
What's the performance difference between an SKPath draw and individual line draws?
Technically I'm using SkiaSharp but this is a general Skia query.
Let's say I have hundreds of points and I'm drawing straight lines or arcs between them.
I could either iterate over each one doing ...
- 697
1
vote
0
answers
53
views
How can I apply non-affine transformations to 2D framework elements in WPF?
Historically, WPF is not able to support 2D non-affine transformations out of the box. Typical solutions require setting up a 3D scene. Of course, I'm trying to avoid creating a 3D scene in my ...
- 79
0
votes
1
answer
83
views
Why is my FOV Perspective Matrix4x4 looking Orthographic (DotNet and SkiaSharp)?
Brief overview, you can image I'm drawing points of a 3D schematic onto a Canvas, think CAD.
I have points in 3D XYZ Vector3 coordinates, and I've got a model, view, projection matrix all setup. I've ...
- 697
2
votes
1
answer
261
views
Blazor Hybrid app and SkiaSharp performance improvements
I am trying to make a simple Maui Blazor Hybrid application that would load a picture, and I would be able to adjust brightness in real time. I managed to do it manually just using simple < img >...
- 47
1
vote
0
answers
270
views
Skiasharp is not working on linux platform
I integrated SkiaSharp to generate images within my .Net 8 application . While developing the project on Windows, everything functioned correctly in the local environment. However, upon deployment to ...
1
vote
1
answer
168
views
.NET MAUI Windows 9.0 Preview 5 on Windows/WinUI 3 crashes when using SwapChainPanel via SkiaSharp after a while
The Problem
We are using .NET MAUI 9.0 Preview 5, .NET SDK 9.0 Preview 5, and SkiaSharp 3.0 Preview 3.1 in our game, GnollHack. SKGLView of SkiaSharp uses SwapChainPanel to render GPU accelerated ...
- 141
0
votes
0
answers
139
views
Silk.NET window flickering when using SkiaSharp
My goal is to create SkiaSharp canvas in Silk.Net window. It is simple program to change rects round borders. When I running my code, my window is flickering.
My code:
using Silk.NET.Windowing;
using ...
3
votes
1
answer
685
views
SkiaSharp.SKBitmap as alternative to System.Drawing.Bitmap doesn't work as expected
I have a working c# code that create a System.Drawing.Bitmap:
byte[] logoBytes = decodeBase64SafeWeb(json["logo.png"].ToString());
using (Bitmap bitmapold = (Bitmap)Bitmap.FromStream(new ...
- 31
0
votes
1
answer
550
views
.net MAUI How to get DPi/PPi cross platform
Get DPI/PPI
Hello,
How can one get the DPI or PPI in Maui for every platform?
I could only find DeviceDisplay.MainDisplayInfo.Density, but this gives me only the scaling of the display like 1,2 and so ...
- 3
0
votes
0
answers
263
views
c# Skiasharp finding SKEncodedImageFormat from image read from a Stream
I'm hoping someone can help.
I have an image as a byte array read from a stream.
I don't know the format of the image, which could be one of many.
I want to use the c# SkiaSharp nuget library to read ...
- 1
0
votes
0
answers
47
views
SKBitmap resourceID = SKBitmap.Decode(stream); is throwing a System.ArgumentNullException:
SKBitmap resourceID = SKBitmap.Decode(stream); is throwing a System.ArgumentNullException.
I tried changing the names, but it's not working. I can't understand what the error is. Please tell me. Here'...
- 1
0
votes
0
answers
258
views
How to draw a interactive dynamic image with .Net MAUI Graphics
I want to create an interactive image (tree) in .NET MAUI (Graphics), where customers can hang their fruits on it. To realize this, I played with a grid view, but that didn't really work out.
My ...
- 153
0
votes
0
answers
52
views
Facing the DllNotFoundException with SkiaSharp.dll while converting the document as a PDF after using the hosted AWS service path
We have deployed the ASP.NET Core Web API with AWS Lambda. While using the hosted AWS service path in the fetch API to invoke the server for saving the document as pdf processing, we faced the problem ...
0
votes
1
answer
107
views
mapsui - SkiaSharp error in SkiaSharp.SKPicture in a revit addon
When I use mapsui in a standard wpf mvvm c# project, everything works fine, but when I try to use the mapsui map in a revit addin, I get the following error:
Method not found: "SkiaSharp....
- 327
0
votes
0
answers
155
views
How to Create GPU SkImage in a Background Thread and Draw it on a Main SkSurface with OpenGL and Skia?
I'm integrating Skia with OpenGL and facing a multi-threading challenge. I need to create a SkImage on a GPU in a background thread and render it on a SkSurface in the main thread. How can I safely ...
- 13.1k
0
votes
0
answers
473
views
Maui- Wait CarouselView scrolling is done - The specified child already has a parent. You must call removeView() on the child's parent first
I defined a CarouselView with the use of left and right arrows.
The problem is that in my views, there are graphic elements which take quite a long time to load.
When I press the scroll arrows several ...
1
vote
1
answer
248
views
how do i bind a skiasharp animation based on a string in maui?
i'm creating a weather app and i get as a response from the api the status of the current weather. since it's a string i could store it in a public string currentWeather with the [ObservableProperty] ...
- 15
0
votes
0
answers
163
views
How do I create a gradient transitioning colors from outside to inside of a path using Skia (Skiasharp)?
I am trying to draw a gradient that transitions from one color at the outside of a path to another color on the interior of a path all the way around the path using SKiasharp. I've been playing with ...
- 11
0
votes
0
answers
268
views
Using maui and SkiaSharp to crop an image for a user profile image. unable to center correctly
I have an image with an overlaid Ellipse target that I want to create another image from. The purpose is to create a user profile image. Can pan in all directions and zoom in/out.
I can create an ...
0
votes
0
answers
46
views
SkiaSharp image created on Azure DevOps pipeline is different to image created locally with the same code
I have a unit test which compares at least the bitmaps created by the test and a bitmap saved in the test project - which has been the output of the same test, but only run locally.
It is expected, ...
- 1
0
votes
0
answers
184
views
Comparing Text Rendering in Skia: SkCanvas's drawSimpleText vs. SkParagraph's drawParagraph
Why does painting the text "💯" on an SkSurface using SkCanvas's drawSimpleText method result in the emoji not being painted, while using SkParagraph's drawParagraph method prints everything ...
- 13.1k
0
votes
0
answers
45
views
Selecting Optimal Color Space for SkSurface
I'm currently working on a cross-platform application for iOS and Android, and I'm using Skia to handle graphics rendering. When creating an SkSurface that represents an app window, I'm uncertain ...
- 13.1k
1
vote
0
answers
169
views
Font in SVG not rendering in PDF using Svg.Skia
My goal is to generate a PDF from an SVG, but I am having trouble getting custom (.otf) fonts into the output document. I'm trying to load the custom fonts with an ITypefaceProvider, so that the ...
- 11
1
vote
0
answers
557
views
How to make AVIF codec a dependency of ASP.NET Web project with SkiaSharp?
It looks like SkiSharp supports Avif. I'm on Windows 10. I see in this PR that the Avif enum value was added to the SKEncodedImageFormat enum.
However when I run the code below with ...
- 33.6k
0
votes
0
answers
263
views
How to Convert Xamarin ImageSource to a Format for Pixel Manipulation (e.g., SkiaSharp or GDI)?
I'm working on a Xamarin.Forms project where I need to perform pixel-level manipulation on images loaded through Xamarin's ImageSource. I'm looking for a way to convert the ImageSource to a format ...
user23066555
0
votes
0
answers
196
views
MeasureText SkiaSharp vs WinForms
I need to measure text height and width using SkiaSharp. This is my SkiaSharp code:
SKPaint p = new SKPaint
{
Typeface = font.Typeface,
TextSize = font.Size
...
0
votes
1
answer
69
views
SKBitmap manipulation issue in Xamarin.Forms with SkiaSharp
I'm working on a Xamarin.Forms project and utilizing SkiaSharp for bitmap manipulation. I have a code snippet that directly manipulates an SKBitmap obtained from an ImageButton source, and it works as ...
user22973130
0
votes
0
answers
67
views
Translating WinForms Drawing Code to Xamarin.Forms Without SKPaintSurfaceEventArgs
I came across the following WinForms drawing code that I need to adapt for use in a Xamarin.Forms project. However, the code is originally written within the SKPaintSurfaceEventArgs event handler in a ...
user22973130
1
vote
0
answers
160
views
Fastest way of drawing lots of circles in SkiaSharp
I'm using SkiaSharp in WPF to draw some custom charts that show lots of points in a scatter plot like in the image below :
I'm currently doing this with the canvas.DrawCircle method, but performance ...
- 879
0
votes
1
answer
323
views
Maui.CSharpMath.SkiaSharp Canvas trying to draw too large bitmap
I am using Maui and library CSharpMath.SkiaSharp and MathPainter from there too create latex formulas. I have an editor where the user enters latex. Using MathPainter, I draw the latex formula as a ...
- 89
4
votes
2
answers
3k
views
Error when running/initializing QuestPDF on docker container
I have a .net core application, which uses QuestPDF for generating PDFs, inside a linux docker container.
If the container starts, QuestPDF does a dependency check, which fails with following error:
...
0
votes
0
answers
223
views
Render xaml content to bitmap
I work with avalonia and skiasharp in c# project. Is it possible to render xaml content (userControl) to bitmap?
This is my xaml:
<UserControl xmlns="https://github.com/avaloniaui"
...
- 111
1
vote
1
answer
304
views
SkiaSharp canvas in ScrollView is still scrolling when drawing
I cannot find a solution to this what seems a simple issue. I have created a simple skisharp finger painting area which is at the bottom of a scrollview in android Xamarin Forms.
this works how ever ...
- 37
0
votes
1
answer
617
views
SkiaSharp convert SVG to PNG - image doesn't fit the canvas size entirely
I'm trying to convert a SVG image to PNG using SkiaSharp and return a PdfSharp XImage object with the image so I could add it to the PDF page (since PdfSharp doesn't directly support SVG format).
This ...
- 13.7k
0
votes
0
answers
678
views
SkiaSharp resizing image - high memory usage
We are using .NET 7 web MVC application and SkiaSharp 2.88.5. We have LoadImage controller action which receives imageId and scaleFactor parameters and scales the image according to the scaling factor....
- 2,241
1
vote
0
answers
61
views
Publish videostream from animated frames in c# application
I have a c# program that renders frames on a canvas using SkiaSharp.
For this I use simple functions as canvas.DrawRect().
But instead of drawing the result each frame on an image, I would like to ...
- 193
2
votes
1
answer
856
views
What is the preferred way of loading Lottie files from internal folder in a .NET MAUI app?
I am in process to migrate Xamarin Forms project to MAUI. I am stuck with SkiaSharp lottieFiles json load issue.
In my app, i download json lottiefile at runtime and save in a app's internal folder. ...
- 234
0
votes
0
answers
116
views
Blazor Webassembly: System.TypeInitializationException
I have a problem with static classes from image processing libraries in blazor webassembly. As soon as i use one i get a TypeInitializationException like in this screenshot:
...
2
votes
1
answer
1k
views
How to display an image from an API in Blazor .NET 7?
I have two microservices. One generates images and the second (Blazor) recieves this image. I want then to display that image WITHOUT saving it anywhere (I have bytes of that image and SKBitmap, ...
- 31
6
votes
2
answers
6k
views
SkiaSharp - scale image down and reduce quality (and hence image size)
We are using .NET 7 and SkiaSharp 2.88.3. We have the following controller action which is used to retrieve a .jpg or .png image from disk and scale it according to scaleFactor parameter (1.0 means ...
- 2,241