Bug 26749 - 8.6 unified api: vImageBuffer.Width/Height/BytesPerRow are not nint
Summary: 8.6 unified api: vImageBuffer.Width/Height/BytesPerRow are not nint
Status: RESOLVED ANSWERED
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: XI 8.6.0
Hardware: PC Windows
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-02-04 14:23 UTC by softlion
Modified: 2015-02-05 08:36 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED ANSWERED

Description softlion 2015-02-04 14:23:47 UTC
And the decompiled code is ... very strange.
Look below.
Width is int, but setter casts it to nint.


namespace Accelerate
struct vImageBuffer:

...
    private nint HeightIntPtr;
    private nint WidthIntPtr;
    private nint RowBytesCountIntPtr;
...
    public int Width
    {
      get
      {
        return (int) this.WidthIntPtr;
      }
      set
      {
        this.WidthIntPtr = (nint) value;
      }
    }

...
Comment 1 Rolf Bjarne Kvinge [MSFT] 2015-02-05 08:00:15 UTC
This is by design; it is highly doubtful you'll ever need Height/Width/BytesPerRow > int32.MaxValue, so we've bound it using the 32-bit data types.
Comment 2 softlion 2015-02-05 08:36:39 UTC
Well,
why didn't Apple thought of this then ?

You are creating a potential limitation to Apple's version because you decided to.
If tomorrow Apple's decide to put specific information in the unused high bits of the 64 bit value, what will happen ? Your customers will be stuck until you fix it.

This is not a good direction to follow.