Add support for XG_MIME_PNG and NSPasteboardTypePNG in both copy&paste directions.

[rmottola]

PNG support needs to be conditional. How can it done be best? I think a run-time feature check from base (NSImage? NSImageRep?) is best.

[rfm]

PNG support needs to be conditional.

In case you missed by response to this idea elsewhere; in gpbs support for every type should be unconditional (I want to add all the pasteboard types publicly declared in the GUI library). That's because gpbs only deals with declaring types and moving the data around, so unless it's going to do format conversion itself (which it mostly shouldn't, though admittedly it does for strings) the data is opaque and the code doesn't need to be concerned about whether other parts of the system support it or not: if other part of the system don't support a type, they just won't copy items of that type to the pasteboard and they won't try to paste in items of that type form the pasteboard.

This probably means that the issue is a lot simpler than you have been thinking, and you are worrying unnecessarily.

[rfm]

Here is a full list of the pasteboard types I found in the GUI headers. Some of them are duplicates (because Apple changed the type names, eg NSTIFFPboardType is the same as NSPasteboardTypeTIFF), and some of them are unlikely to have an equivalent in X, but we should be able to support things like PDF, URL, HTML, VCard, perhaps Color, Font Ruler

GSMovableToolbarItemPboardType NSColorPboardType NSDataLinkPboardType NSFileContentsPboardType NSFilenamesPboardType NSFilesPromisePboardType NSFontPboardType NSGeneralPboardType NSHTMLPboardType NSPasteboardTypeColor NSPasteboardTypeFont NSPasteboardTypeHTML NSPasteboardTypeMultipleTextSelection NSPasteboardTypePDF NSPasteboardTypePNG NSPasteboardTypeRTF NSPasteboardTypeRTFD NSPasteboardTypeRuler NSPasteboardTypeSound NSPasteboardTypeString NSPasteboardTypeTabularText NSPasteboardTypeTextFinderOptions NSPasteboardTypeTIFF NSPDFPboardType NSPICTPboardType NSPostScriptPboardType NSRTFDPboardType NSRTFPboardType NSRulerPboardType NSStringPboardType NSTabularTextPboardType NSTIFFPboardType NSURLPboardType NSVCardPboardType

[rmottola]

I'm afraid I already made conflicting changes while adding support for text/plain;charset=utf8 (which seems to be a commonly used type) and clearer debug output.

The only actual bug I can see is that the line: xTypes[numTypes++] = XG_MIME_PNG; should be paired with an increase in the size of the xTypes buffer, to avoid any possibility of a buffer overrun.

Well; I found it cleaner to work on a branch, after we hacked deep into the night and I continued... I did some test this morning. Told you I would push a branch.

My changes are now stale, I think this branch is now useless. I think you missed a bit, but I will look twice and just push to master in case.

[rmottola]

Here is a full list of the pasteboard types I found in the GUI headers. Some of them are duplicates (because Apple changed the type names, eg NSTIFFPboardType is the same as NSPasteboardTypeTIFF), and some of them are unlikely to have an equivalent in X, but we should be able to support things like PDF, URL, HTML, VCard, perhaps Color, Font Ruler

Yes, you are probably correct. the pastboard server is just a "messenger" there. As we have seen in Price, both available types in copy and in paste are decided by the application and it can be made dynamic from available types. It is true for Image Reps, for other types I don't know, but there even more it may be app-specific? (e.g. RTF, HTML... different text formats, who could transform UTF8 to e.g. latin1 in the copy?)

[fredkiefer]

I did read the comments from Richard only after I commented myself. I agree with his considerations on PNG and other types. In the end it is the application that decides what it offers or what it wants to consume. The pasteboard server should not interfere with that.