Blender Git Loki

Polyline strokes could have dabs not belonging to the lines due to the
way dab interpolation for space strokes worked. This commit includes an
simpler implementation based on the initial space stroke code that
corrects this issue.

Allow gradient fill color mixing with the background, now it does a
regular over operation based on gradient alpha. Still no alpha influence
for gradient strokes.

Spacing gradient strokes. The gradient circles after a certain gradient
spacing which is set in the gradient properties.

Fix gradient fill not working with spaced strokes released close to the
start of the stroke

Gradient stroke guided by pressure for 2d and projective texturing.

Merge trunk -r59019 into soc-2013-paint

Allow linking of palettes

Fix secondary color not used in 2d painting for inverted strokes (ctrl-

Merge trunk -r58931 into soc-2013-paint

Gradient fill functional in 2d paint. To use select the fill tool and
tick use gradient. Then drag on the canvas to define the gradient line.

Fix color drag'n'drop so that it is possible to drop colors to both UI
widgets and the main image spae region

Changes to the fill/gradient tools:

Fill is now a paint tool, this is done to get correct cursor drawing for
gradient fill. It also allows to unify the gradient and fill tools to
one and use the appropriate depending on whether gradient is checked or
not.

Gradient fill and strokes are still inactive in this commmit, but I
added another goodie, drag'n'drop of colors in the image editor main
window while paint mode is active will do bucket filling.

Modify polyline drawing to make the last line segment dotted. This
signifies that it won't be used for the final stroke. Also reset line
width value, this made the lines in the UI thicker when using line
strokes.

Merge trunk -r58900 into soc-2013-paint

* Show spacing in UI for polylines
* On Confirm, last line point is dangling, don't use for polyline.

Merge trunk -r58813 into soc-2013-paint

Polyline becomes a separate stroke mode. Rationale for this is that
artists like the quick drag and release for quick lines and requiring
the user to keep the shift key pressed for new line segments would be
cumbersome and inconsistent because it would mean that first line
additionis done on release and subsequent get added on key press.

So, lines now use a drag-release paradigm and polylines use regular
clicking. To confirm, use space or enter like on any operator. Polyline
bit was used for fixed textures on earlier blender versions, meaning
that I'll have to make sure that flag is not used anymore. I will do a
commit for this on trunk.

Merge trunk -r58805 into soc-2013-paint

WIP. gradient code

Merge trunk -r 58803 into soc-2013-paint