💾 Archived View for g.mikf.pl › gemlog › 2023-02-13-compressor.gmi captured on 2024-06-16 at 12:16:44. Gemini links have been rewritten to link to archived content
⬅️ Previous capture (2023-03-20)
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2023-02-13
I went to ComboBox1 properties and opened the Items (Collection) to see just one line "JPG". I replace that with lines: Jpeg JpegCMYK Gif GifCMYK Webp WebpCMYK Heif HeifCMYK
Added to Codec() method:
Dim format
Select Case ComboBox1.SelectedValue
Case "Jpeg", "JpegCMYK"
format = ImageFormat.Jpeg
Case "Gif", "GifCMYK"
format = ImageFormat.Gif
Case "Webp", "WebpCMYK"
format = ImageFormat.Webp
Case "Heif", "HeifCMYK"
format = ImageFormat.Heif
Case ""
format = ImageFormat.Jpeg
ComboBox1.SelectedValue = "Jpeg"
Case Else
Throw New ArgumentException(ComboBox1.SelectedValue)
End Select
Added to Params() method:
Dim formatName As String = ComboBox1.SelectedValue
If formatName.EndsWith("CMYK") Then
Dim cmykTrue As Short = True
param = New EncoderParameter(Encoder.SaveAsCmyk, cmykTrue)
obj.Param(1) = param
End If
It then turned out I may need to add a `Nothing` case to the `""` empty string case. And then it turned out that despite Codec and Params being called to supply argument values in that order, Params seems to be called first or simultaneously. I decided to localize the variable to ensure Codec gets called first.
While trying to test that, I accidentally chose an mp4 file instead of an image: so it turned out, I needed to catch `System.OutOfMemoryException` on the `Image.FromFile` call.
Catch oom As OutOfMemoryException
MessageBox.Show("
The file has given us an OOM because of its sheer size.
Goodbye.
", "File too large", MessageBoxButtons.OK, MessageBoxIcon.Error)
Close()
Return
End Try
I then decided to make the earlier things
`Select Case ComboBox1.SelectedText` (but with setting `ComboBox1.SelectedValue = "Jpeg"`) and `Dim formatName As String = ComboBox1.SelectedText`, respectively.
And only then I debugged and it turns out I should have used `SelectedItem` everywhere, instead.
And I then added a handler for ComboBox1.SelectionChangeCommitted that just calls Render().
I then moved the `Dim formatName` in `Params` to the top and made the EncoderParameters constructor get a
`If(formatName.EndsWith("CMYK"), 2, 1)`
instead, and then I made the IDE abstract the EndsWith into a method along with getting the SelectedItem, and then inlined the variable, just to get
Private Function isCMYK() As Boolean
Return ComboBox1.SelectedItem.EndsWith("CMYK")
End Function
I then made Codec() return
`.FirstOrDefault(CType(Nothing, ImageCodecInfo))`
instead, and that will have to be handled, so
If result Is Nothing Then
format = ImageFormat.Jpeg
MessageBox.Show($"Format has been set to jpeg because {ComboBox1.SelectedItem} was not available in the system.")
ComboBox1.SelectedItem = "Jpeg"
result = getTheFormatFromCodecs(format, codecs)
End If
having had extracted a method out of the Select with FirstOrDefault, but still using the `codecs` array, while I should cache both from the start really.
And we will just have to start with checking which are available and removing them from ComboBox1's Items Collection.
I then decided to add a simple
`ToolStripStatusLabel1.Text = compressed.Length.ToString`
at the end of `Render()`. Worked liked a charm and shown us that the Quality parameter doesn't affect Gif, nor does our CMYK Jpeg option change a thing as the sizes are the same as with non-CMYK. We gotta implement saving to be able to actually inspect things as files.
See me with an external display in a train:
