This patch adds three new modes to the brush-tool where it is now
possible to use a dodge or burn function with the brush and a soft mode
where the overdraw is reduced so that the stroke looks much softer.
The dodge and burn functions are used to brighten or darken the colors
in the affected area of the brush. The user can decide if the
highlights, midtones or shadows should be prioritized by the brush.
This patch optimizes how the Brush-Tool modifies the pixels. The new
logic generates a "reference brush" with the required size, falloff
and color only once and uses that for the rawing operations. If no
editing mask is used the reference brush is writen via a blit operation
to the content or mask image. This increases the drawing speed and
therefore also allows bigger brush sizes.
This patch allows a bigger brush tool size of 250 pixels and limits the
cursor bitmap to a reasonable size so that its not much bigger than the
image editor size. If the cursor is bigger as the editor it is rended
with a red edge to indicate that the actual cursor is bigger than
displayed. This change mitigates the OOM conditions when the cursor
gets unusual big.
Gfx::Color is always 4 bytes (it's just a wrapper over u32) it's less
work just to pass the color directly.
This also updates IPCCompiler to prevent from generating
Gfx::Color const &, which makes replacement easier.
This patch mitigates a rough gradient for the brush tool with a low
hardness. Previously the gradient alpha value was truncated by the type
conversion to int. Now the desired alpha value is scaled up to mitigate
the information loss due to type conversion which results in a much
smoother gradient.
This effectively creates a double-buffer for tools to use when modifying
the layer's bitmap (content or mask). Once the changes have been made
the tool reports to the layer that it has made changes along with a Rect
of the changed region. The layer will then merge the changes from the
scratch image to the real bitmap. This merge is done as follows: If a
given pixel is inside the selected region, the pixel from the scratch
bitmap is copied to the real bitmap. If the pixel is not inside the
selected region, the pixel from the real bitmap is copied to the scratch
bitmap.
As an optimization, when there is no selection active, the new method
for getting the scratch bitmap will return the real bitmap and no
merging will need to take place.
The Undo/Redo actions now tell you what kind of action will be
undone/redone. This is achieved by adding an "action text" field to the
ImageUndoCommand and having everyone who calls did_complete_action()
provide this text.
This is in preparation to support masking of Layers. We now distinguish
between the "display_bitmap" which will be the whole Layer with every
effect applied and the "content_bitmap" which contains the actual
unmodified pixels in the Layer.
