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Thread: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/DLL

  1. #1

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    Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/DLL

    Shell Image Interfaces

    Project Description
    Windows provides a good bit of image functionality built in and accessible through simple interfaces rather than fairly complicated API. A number of these were added to the latest release of oleexp. This projects demonstrates several of these interfaces:

    IShellImageData
    Easy to create with ShellImageDataFactory object.
    Set pFact = New ShellImageDataFactory
    pFact.CreateImageFromFile StrPtr(sISID), pShImg
    pShImg.Decode SHIMGDEC_DEFAULT, 10, 10

    This is the most useful interface, it can:
    -Display basic info about an image (see picture)
    -Step frame-by-frame through an animated GIF, or use a timer to 'play' it - I added this feature in after I took the screen shot-- it's included in the attached project
    -View multi-page TIFF images
    -Scale images with different algorithm options e.g. bicubic
    -Scaling icons first loads the closest size
    -Rotate an image at multiples of 90 degrees
    -Draw onto a picturebox with transparency
    -Save changed image (supports user-defined encoder parameters, but not shown in demo)
    ...all through single-line calls,
    Code:
    pShImg.ScaleImage CLng(Text5.Text), CLng(Text6.Text), InterpolationModeBicubic
    pShImg.NextFrame
    pShImg.Rotate CLng(Text4.Text)
    'saving is equally easy:
    Dim ipf As IPersistFile
    Set ipf = pShImg
    ipf.Save sFullPath, 1
    IImageTranscode
    This interface allows you to convert any image file supported by Windows into a JPG or BMP with only a few lines of code:
    Code:
    Private Sub DoTranscode(psiSrc As IShellItem, psiDest As IShellItem, nTo As TI_FLAGS)
    'The included module provides a standalone implemention of this routine if you're starting
    'from only the file paths. This version uses a number of shortcuts getting an IShellItem
    'directly from FileOpenDialog gives us
    
    Dim lpDest As Long
    Dim pStrm As IStream
    Dim pTI As ImageTranscode
    Dim pwi As Long, phg As Long
    
    Set pTI = New ImageTranscode
    
    psiDest.GetDisplayName SIGDN_FILESYSPATH, lpDest
    
    Call SHCreateStreamOnFileEx(lpDest, STGM_CREATE Or STGM_READWRITE, FILE_ATTRIBUTE_NORMAL, 1, 0, pStrm)
    pTI.TranscodeImage psiSrc, 0, 0, nTo, pStrm, pwi, phg
    pStrm.Commit STGC_DEFAULT
    
    Set pStrm = Nothing
    Set pTI = Nothing
    Call CoTaskMemFree(lpDest)
    
    End Sub
    IImageList/IImageList2
    These interfaces are very similar to API imagelists (and indeed you can get an API imagelist handle you can use with those functions or assign to a control just by using ObjPtr(pIML)), but apart from being slightly easier to work with also allow resizing on the fly, instead of having to reconstruct. This is also the only way to scale up, because as with API imagelists, you cannot add images smaller than the size the imagelist was created as.
    It's important to note than you can create one from scratch, but not with = New ImageList, you need to use ImageList_CoCreateInstance, as shown in the sample project.

    Project Requirements
    -Windows Vista or higher
    -oleexp.tlb version 4.0 or higher (released 24 Nov 2016). Only required for the IDE, you don't need to include it with the compiled program.
    -Working with IImageList/IImageList2 requires that your app (and the IDE to run from there) is manifested for the 6.0 common controls

    Project Update
    -Added icons/cursors to the Open dialog for IShellImageData
    -Added more complete navigation for multipage TIFFs, and added a sample 6-page LZW compressed image
    -----
    Some sample images to play around with are included in the ZIP; I didn't make them.
    Attached Files Attached Files

  2. #2
    VB-aholic & Lovin' It LaVolpe's Avatar
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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    fafalone, got my interest. I'll download and play a bit, research a bit, for possible inclusion into my image control. From your short descriptions, sounds like the interface may wrap GDI+ on Vista and WIA on Win7+?

    One MSDN comment concerns me about longevity of the interface:
    IShellImageDataFactory
    This interface is not expected to be available in later versions of Windows. It is recommended that Windows GDI+ APIs be used in place of IShellImageDataFactory methods.
    Edited. Think I'll pass. This statement made up my mind. However, appreciate your effort showing usage of the interfaces. Thanx.

    IShellImageData
    [This interface will eventually be unsupported. It is recommended that Windows GDI+ APIs be used in place of IShellImageData methods.]
    Upon further review, IShellImageData definitely wraps GDI+, or more specifically, a subset of GDI+ methods
    Last edited by LaVolpe; Sep 25th, 2015 at 09:31 PM.
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    {Alpha Image Control} {Memory Leak FAQ} {Unicode Open/Save Dialog} {Resource Image Viewer/Extractor}
    {VB and DPI Tutorial} {Manifest Creator} {UserControl Button Template} {stdPicture Render Usage}

  3. #3

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    Yeah they say that about a lot of things, but it's very rare they actually remove something like this. It was only just introduced in Vista, it's not like a Win98 legacy thing. It's available in 10, so it disappearing isn't something to worry about in the next decade.

    I'd worry about the VB runtime, and especially IDE, breaking before this. VB lives in the deprecated world. They'll deprecate it, not support it, but they won't remove it for decades.

  4. #4
    VB-aholic & Lovin' It LaVolpe's Avatar
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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    If it's in Win10, then it'll be around for at least as long as Win10, and longer if carried with VB runtimes into future operating systems.

    In my case, I wouldn't find it useful because the functions are too limited for my needs. For example, rotation is restricted to 90 degree angles, among other points. It could be easier for people that want to support PNG,TIFF and animated GIFs in VB without need to know much about GDI+. Though anyone with GDI+ experience will find they could easily whip up a class that wraps the same functionality as those interfaces. I am be curious as to what GDI+ version it uses in Vista, but not that curious.
    Insomnia is just a byproduct of, "It can't be done"

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    {Alpha Image Control} {Memory Leak FAQ} {Unicode Open/Save Dialog} {Resource Image Viewer/Extractor}
    {VB and DPI Tutorial} {Manifest Creator} {UserControl Button Template} {stdPicture Render Usage}

  5. #5

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    Yeah IShellImageData isn't meant for serious work; it's just handy if all you need are the basics; and for what it does do, it's by far the easiest way.

    IImageList on the other hand, is the most modern and advanced way of handling imagelists

  6. #6

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    I noticed something very interesting... not only does IShellImageData load icons (and support alpha-blended 256x256 (probably higher too in later Windows) icons), but when you use the Scale function, it actually loads the icon index closest to the requested size. When I first loaded an icon, it showed the 16x16 version. When I scaled to 128x128 and 127x127, I got the full quality icon, definitely not the 16x16 scaled up. The only slight issue is that entering odd sizes and re-scaling may break this; so ideally to show a larger size always reload and scale up.

    So project was updated to add icons/cursors into the Open dialog's default filter, and to have more complete navigation options for multi-page TIFFs. And to remove some embarrassing inappropriate debug comments, sorry.

  7. #7
    VB-aholic & Lovin' It LaVolpe's Avatar
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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    The function likely has code similar to what I and others use. When a specific size is requested, locate the best match. Best match is defined as closest to size and color depth. For closest in size, error to next larger size. Images look far better scaled down than scaled up.

    Windows functions don't seem to do that, opting for scale down vs scale up. Depends on which icon is closest in size, numerically. Vista introduced a new API: LoadIconWithScaleDown (quote below). Is it possible the shell interface is using that? or is it doing what it would normally do.
    This function will first search the icon file for an icon having exactly the same size. If a match is not found, then unless both cx and cy match one of the standard icon sizes—16, 32, 48, or 256 pixels— the next largest icon is selected and then scaled down to the desired size. For example, if an icon with an x dimension of 40 pixels is requested by the callign application, the 48-pixel icon is used and scaled down to 40 pixels. In contrast, the LoadImage function selects the 32-pixel icon and scales it up to 40 pixels.

    If the function is unable to locate a larger icon, it defaults to the standard behavior of finding the next smallest icon and scaling it up to the desired size.
    You can test if curious the new API is being used or the default methods:
    1) Create icon file with a 256x256 and 32x32 icon only, preferably different visual design
    2) Choose a size of 64x64. Either the 32x32 was scaled up or the 256x256 was scaled down

    Now, if the interface loads 24 bit icons on XP/Vista, then it appears it may be using v1.1 of GDI+. GDI+1 v1.0 had several issues with loading various image formats, including: JPG, GIF, ICO, CUR, TIFF. Won't recognize alpha channel of 32bpp bitmap. No known issues with metafiles.

    Regarding toggling back & forth breaking things? That class has an 'undo' type method. It should probably be called before rescaling a second time.
    Insomnia is just a byproduct of, "It can't be done"

    Classics Enthusiast? Here's my 1969 Mustang Mach I Fastback. Her sister '67 Coupe has been adopted

    Newbie? Novice? Bored? Spend a few minutes browsing the FAQ section of the forum.
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    {Alpha Image Control} {Memory Leak FAQ} {Unicode Open/Save Dialog} {Resource Image Viewer/Extractor}
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  8. #8

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    I'll look into it in more detail later, but the icon I was testing with had 48x48 and then nothing until 256x256. If I requested 100x100, it scaled up the 48x48, but if I request 128x128, then it scaled down the 256x256 icon (but only if I reloaded first, otherwise it scaled up more).

  9. #9

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    So apart from the sizing issue; it doesn't even recognize the alpha channel on a bitmap under Win7 (I am running manifested for GDI+ 1.1). Are you saying that means it's using 1.0? Because even using the APIs directly I could never get transparent bmps. (png/jpg work)

  10. #10
    VB-aholic & Lovin' It LaVolpe's Avatar
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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    Are you saying that means it's using 1.0?
    No, not at all. GDI+ doesn't do 32bpp bitmaps at all as far as I know.

    Win7 and above, GDI+ 1.1 is always loaded. One would have to manifest for v1.0 if they wanted it for some reason & that option to downgrade disappeared in Win8.1 from what I've read.

    Here's a JPG (zipped). On Vista, if it fails to open, likely v1.1. If it opens on Vista & reports 0x0 width,height then likely v1.0. P.S. That JPG should load fine on Win7+
    Attached Files Attached Files
    Insomnia is just a byproduct of, "It can't be done"

    Classics Enthusiast? Here's my 1969 Mustang Mach I Fastback. Her sister '67 Coupe has been adopted

    Newbie? Novice? Bored? Spend a few minutes browsing the FAQ section of the forum.
    Read the HitchHiker's Guide to Getting Help on the Forums.
    Here is the list of TAGs you can use to format your posts
    Here are VB6 Help Files online


    {Alpha Image Control} {Memory Leak FAQ} {Unicode Open/Save Dialog} {Resource Image Viewer/Extractor}
    {VB and DPI Tutorial} {Manifest Creator} {UserControl Button Template} {stdPicture Render Usage}

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    Hi fafalone,

    "ImageList_CoCreateInstance entrypoint not found"
    Different comctl32.dll on win 7 ?

  12. #12

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    Your app (and the IDE to run from there) needs to be manifested for the 6.0 common controls ... I'll make a note of that in the main post too.

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    Re: Easy image disp/edit; scale/rotate, show animated gifs, conv2JPG, +more; No GDI+/

    OK fafalone and thanks you so much.

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