Each tool can have its own set of properties that can be modified
through a panel on the right side.
The tools I've added properties for are:
Pen:
Thickness
Brush:
Size
Hardness
Spray:
Thickness
Density
Bucket:
Threshold
By allowing to specify a separate source bitmap when calling Filter::apply
the same filter can be applied to multiple areas, and also doesn't need
to use a temporary bitmap. This also enables us to apply the filter to
multiple regions properly, even if they are (almost) adjacent.
If no separate source bitmap is supplied then a temporary bitmap is still
necessary.
By moving the Bitmap and Rect out of Filter::Parameters we can re-use
the parameters more efficiently, allowing the filter to be applied
to many bitmaps without having to re-create the filter every time.
Indexed bitmaps used to allocate four times the required amount of memory.
Also, we should acknowledge that the underlying data is not always RGBA32,
and instead cast it only when the true type is known.
Since the vast majority of message boxes should be modal, require
the parent window to be passed in, which can be nullptr for the
rare case that they don't. By it being the first argument, the
default arguments also don't need to be explicitly stated in most
cases, and it encourages passing in a parent window handle.
Fix up several message boxes that should have been modal.
During app teardown, the Application object may be destroyed before
something else, and so having Application::the() return a reference was
obscuring the truth about its lifetime.
This patch makes the API more honest by returning a pointer. While
this makes call sites look a bit more sketchy, do note that the global
Application pointer only becomes null during app teardown.
We use this to automatically update the thumbnail in LayerListWidget
when you draw into a layer. We also use it to repaint the ImageEditor
when the image changes somehow. :^)
Instead of using a TableView to show the layer stack, let's build a new
custom widget for this purpose and give it some neat features!
This patch also introduces an ImageClient interface for Image to notify
interested parties about things happening. The LayerListWidget is the
first ImageClient and listens for "layer added" and "layer removed"
notifications. :^)
ImageEditor now supports panning (Ctrl+MiddleMouse) and scaling (Wheel)
the image. This took a lot of unpleasant coordinate math, but now it
actually kinda works and feels awesome! :^)
