Picture.Graphics is Nil?

Getting Started
1

Hello

I open a picture on my computer, and want to access the graphics. The picture is not nil, but the graphics are Nil. How is this possible?

[code] Dim picFile As FolderItem
picFile = GetOpenFolderItem()

If picFile <> Nil Then
Dim pic As Picture
pic = Picture.Open(picFile)

pic = ModernizePicture(pic)

pic.Graphics.ForeColor = &cFFFFFF
pic.Graphics.TextUnit = FontUnits.Pixel
pic.Graphics.TextSize = 50[/code]
2

some pictures are read only and than graphics is nil.

4

Just tested, picFile.IsWriteable returns true.

5

What does “ModernizePicture” do? Can you post the Code please?

6

Hello

It was the ModernizePicture function from this page: http://documentation.xojo.com/index.php/Picture

But I found out what was wrong. It had something to do with HiDPI support.

ModernizePicture was:

[code] If input.hasAlphaChannel Then Return input

Dim result As New Picture( input.Width, input.Height )
result.HorizontalResolution = input.HorizontalResolution
result.VerticalResolution = input.VerticalResolution
result.Graphics.DrawPicture( input, 0, 0 )
Return result[/code]

I deleted the first line, now it ALWAYS makes a new copy of the image. Now it works. I totally don’t understand why an image would be immutable because of HiDPI, but apparently, it is.

Read here: http://blog.xojo.com/2016/04/05/xojo-retinahidpi-the-journey-of-a-thousand-pixels/

Thanks for thinking with me!