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Apr 15, 2014

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    Get Image -> Crop to Selection working with layers

    I've been dreading this, but it ended up being a great chance to revisit
    some old code, written before PD switched to its current "always
    premultiply alpha" approach.  Because of that, I was able to not only
    get Crop to Selection working with layers, but also to greatly improve
    the performance of cropping in general, as well as retrieving a chunk of
    the image as processed by a selection (yay!).
    Note that cropping an image to a selection may cause some layers to
    become fully transparent, if they lie off completely off the selection.
    So it's not a bug if layers suddenly don't have thumbnails after the
    authored April 15, 2014
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    Remove Image -> Isometric menu

    In the future  I may add this feature back as a plugin of some sort, but
    right now it would require an unfortunate amount of of work to make it
    layers-friendly (and given its niche appeal, I'd rather spend that time
    authored April 15, 2014
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    Get Image -> Resize working with layers

    Another key step on the path to "full layers support".  As part of
    revisiting this function, I also removed the old custom resampling code
    (which worked well, but was enormous) in favor of leaning on GDI+ if
    FreeImage can't be located.
    authored April 15, 2014
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    Greatly improve the pdDIB .renderToPictureBox function for 32bpp images

    This function is only used a handful of places (such as the Unsaved
    Changes dialog, where a preview of the image is needed), but its
    previous results were quite poor due to StretchBlt mangling RGBA data.
    GDI+ is now used for high-quality resampling.
    authored April 14, 2014
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    Get Image -> Rotate arbitrary working with layers

    This is the big one!  To my knowledge, no other free photo editor
    (including biggies like GIMP and Paint.NET) allow arbitrary rotation of
    layered images.  They all require you to flatten the image first.
    But we are better than that.  ;)  Large images might take some time to
    rotate, but the results will be perfectly aligned (and by perfectly I
    mean with sub-pixel accuracy!).
    Also, I got live previews working again.
    authored April 14, 2014
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    Get Image -> Rotate 90/270 working with layers

    Unpleasant project; glad to have it over.
    authored April 14, 2014

Apr 14, 2014

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    Improve comments

    authored April 14, 2014
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    Get effect previews + selections working again

    With this commit, all items in the Adjustment and Effects menus should
    be working 100% correctly.  If something is not working, please report
    it as a bug.
    authored April 14, 2014
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    Get selection/effect interaction working again

    PD is awesome because it manages all layer boundaries automatically,
    rather than forcing them to the size of the image like other photo
    editors *cough* Paint.NET *cough*, or making the user manually enlarge
    layers when they do something that lies outside layer boundaries *cough*
    GIMP *cough*.  This makes PD both user-friendly and very light on RAM.
    Unfortunately, it also creates some ugly programming situations.  This
    commit tackles one such area.  Selections can exist anywhere on an
    image, including completely outside the active layer's boundaries, which
    causes a conundrum when the user tries to apply an action to the
    selected area.
    I've now solved the problem for final adjustment and effect actions, but
    previews remain to be done.  They are even messier on account of the
    dynamic scroll/zoom considerations.
    authored April 14, 2014
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    Improve comments

    authored April 14, 2014
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    Rewrite Image -> Indexed color to support layers

    I wanted to tackle this operation next because it requires a flat image,
    which is kind of a unique challenge.  Fortunately, finding a
    Layers-friendly solution wasn't too difficult.
    Basically, the dialog now warns the user that it will flatten the image
    before proceeding (but the image can still be previewed to get an idea
    of how it would look at 8bpp).  Previews work similar to the JPEG export
    dialog, by requesting a non-standard preview source - in this case, the
    composited image.
    I also cleaned up the code a bit, thanks to more familiarity with
    FreeImage these days, and added a progress bar so the user has some idea
    of how long the function may take.
    authored April 14, 2014
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    Fix severe Flatten Image bug

    Typed ID when I meant Index, ugh.
    authored April 14, 2014
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    Rewrite Image -> Canvas Size to support layers

    Arguably the easiest function to rewrite, as no pixel data has to be
    modified - just the virtual bounding box around the layer collection.
    authored April 14, 2014
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    Rewrite Image -> Flip horizontal/vertical to support layers

    Technically, these functions are simple enough that they could be
    written using custom math.  However they provided an easy way to test
    the new null-padding layer transformation system - which works
    authored April 14, 2014
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    Write null padding trim function for layers

    This is key to fixing the Image menu.
    One of the big difficulties with Layers support is how to apply
    image-wide transforms.  Some software outright disallows this (for
    example, GIMP does not allow arbitrary rotation without first flattening
    an image) because of the nasty math involved.  But PD is better than
    My solution is as follows: before applying an image-wide transform, like
    "rotate image", we must first pad all layers with transparent pixels so
    that they are the size of the full image.  Then, apply the
    transformation to each layer individually.  When the transformation is
    complete, auto-crop all layers using this new "null padding trim"
    function.  (In effect, look for fully transparent rows and columns, and
    remove them from the image.)
    My approach provides a universal way to process any full-image
    transforms, without needing ugly custom-transform code for each
    transformation.  Hopefully this means I can get the Image menu back in
    working order sooner rather than later...
    authored April 14, 2014
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    Rewrite Image -> Duplicate to work with layers

    One of the great things about PD's Layers rewrite is that it forced me
    to rework a lot of the existing codebase, which in turn gave me an
    excuse to clean-up some of PD's oldest infrastructure bits.  The new
    infrastructure makes it much easier for me to do complex things (like
    duplicate an image).
    Anyway, the new "Duplicate Image" function is significantly smaller than
    the old one, but with much better performance and elegance.  It also
    supports full duplication of multilayered images.
    authored April 14, 2014
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    Rewrite 32bpp image effect previews to use GDI+ for resizing

    Better results, better performance, everyone wins.
    authored April 13, 2014
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    Fix Transparency menu options to work with layers

    All transparency options should now work just fine with Layers.
    (Note also that all transparency options are now located in the Layers
    menu instead of the Image menu.)
    authored April 13, 2014
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    Update viewport code with new GDI+ profiling results

    After a bunch of profiling on my Win 7 PC, I can state with great
    confidence that the HighQualityBicubic interpolation mode is the fastest
    mode for downsizing 32bpp images via GDI+.  I have no idea why this is,
    but many, many iterative tests confirmed it.
    Stranger still, in descending order, the fastest algorithms are as
    follows.  (Testing done on a 6 megapixel, 5 layer image with tons of
    varying alpha.)
    NearestNeighbor (obviously) - < 10 ms per frame
    HighQualityBicubic - mid 40's
    HighQualityBilinear - mid 50's
    Bilinear - low 60's
    Bicubic - 150+ ms per frame
    Regular bicubic interpolation is some 4x slower than the high quality
    mode, which makes NO FRIGGIN' SENSE.  Also, how badly do you have to
    write a bilinear interpolation algorithm to have it outperformed
    significantly by a bicubic one??
    Anyway, I'm happy to put this matter to rest.  It's possible that
    different hardware/software combinations could cause a different result,
    but I'm content to stick with HighQualityBicubic for now, especially
    since it makes the viewport noticeably smoother while also improving
    render quality while zoomed out.
    authored April 13, 2014

Apr 13, 2014

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    "Raise layer to top" and "Lower layer to bottom" now implemented

    authored April 13, 2014
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    "Delete hidden layers" now implemented

    Also, a number of fixes and edge-cases added to the menu enable/disable
    authored April 13, 2014
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    "Merge visible layers" now implemented

    More nuances to this than I expected, as you can have cases where the
    number of visible (and by extension, hidden layers) extends from 0 to
    numOfLayers, in any conceivable pattern.
    This function required new helper functions for counting visible/hidden
    layers, and those allowed me to knock out more "menu state synching"
    issues, e.g. only allow "Merge Visible Layers" if there is more than one
    layer visible.
    authored April 13, 2014
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    "Flatten image" now implemented

    authored April 13, 2014
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    Rewrite clipboard Copy support to account for layers

    Both Copy and Copy Merged are now available, and both work with
    selections active or inactive.  (If no selection is present, Copy will
    copy the active layer, while Copy Merged will copy a composited version
    of the full image.)
    authored April 13, 2014
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    Rewrite Paste support to account for layers

    There are now two supported Paste operations:
    - Paste as new layer
    - Paste as new image
    "Paste as new layer" supports nearly all the same features as "Paste as
    new image" - e.g. 32bpp data and file paths are handled just fine
    (including multiple file copies from Explorer; each file will be loaded
    as a new layer).
    The one exception is URL paths.  This is not currently supported for
    "Paste as new layer", but it's on my to-do list.
    authored April 13, 2014

Apr 12, 2014

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    Add placeholder message boxes for incomplete Layer menu items

    authored April 12, 2014
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    Temporarily disable undo/redo when raising/lowering layers

    There are pros and cons to including non-destructive actions like layer
    order changes in the undo/redo chain.
    At present, undo file creation remains slow on very large images, so I'm
    disabling it for basic "raise or lower layer" actions.
    authored April 12, 2014
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    Improve undo/redo performance

    There's a ton of work to do on undo/redo performance (right now, a full
    copy of the entire layer stack is saved to file for every action), but
    it's quite unpleasant and complicated work.
    In the meantime, this commit will help a little bit.  When working with
    undo data, PD now:
    - skips compression
    - skips checksum calculation (when saving) and reading (when loading)
    authored April 12, 2014
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    Mirror all layer box functionality in the Layer menu

    Also, layer stack order changes now triggers Undo/Redo creation
    authored April 12, 2014
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    Get layer menu enable/disable state worked out

    It's fairly complicated, as things like layer position and count affect
    what options are available (e.g. no Merge options for single-layer
    images).  Hopefully it's all working as it should...
    authored April 12, 2014
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    Add layer menu placeholder code

    All the layer menus are now ready to have processor calls plugged in.
    authored April 12, 2014
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    Flesh out layer menu

    Not completely, just yet - Layer transforms (resize, rotate, etc) will
    be done later.  For now, I mostly wanted a framework so I could start
    plugging in various Layer menu actions.
    authored April 12, 2014
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    Add destructive layer actions to central Processor

    Duplicate, Merge Down, Merge Up, and Delete Layer are now processed by
    PD's central processor, which means they trigger Undo/Redo handling, and
    can be recorded as part of macros.
    authored April 12, 2014
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    Strip file extensions from layer names

    authored April 12, 2014
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    When a layer is copied, automatically increment its name with a trail…

    …ing number
    e.g. "<base layer name> (2)".  The new support function that handles
    this is generalized around any string, and it's smart enough to
    automatically detect an existing number.  Thus a string like "<base
    layer name> (2)" gets incremented to "<base layer name> (3)", as opposed
    to "<base layer name> (2) (2)".
    I like how GIMP calls duplicate layers "<base layer name> Copy", "<base
    layer name> Copy 2", etc, but that approach has ugly translation
    implications, so for now I'm just going with a numeric indicator when
    duplicating layers.
    authored April 12, 2014
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