When the source alpha is zero, we don't calculate the blended color,
so `comp[b]` can be infinite or NaN, in which case the expression
`in[ALPHA] * (comp[b] - layer[b])` is NaN, rather than the expected
value of zero.
and to operations/layer-modes/, respectively.
Add gimp_layer_modes_init() which asserts on the correct order of the
GimpLayerModeInfo array, and switch to accessing the array directly in
gimp_layer_mode_info().
Similar to the Photoshop mode of the same name. Assigns
either 0 or 1 to each of the channels, depending on whether the
sum of source and destination channel values is less than, or
greater than (or equals to), one, respectively.
This is equivalent to inverting the source, and using it to perform
per-pixel, per-channel threshold against the destination, which is
useful for various effects.
Stuff like passing "input" directly if "aux"'s opacity is 0, etc.
Used to be partly handled by normal mode, even though it applies
to other modes too.
Adjust the logic for the new compositing modes.
Add a GimpLayerModeAffectMask enum, and a corresponding
get_affect_mask() function to GimpOperationLayerMode, which
specifies which of the op's inputs, if any, are affected by the
mode, apart from the overlapping regions. Most modes affect only
the overlapping regions, but dissolve and replace also affect the
rest of the input. This information is used for determining if
the optimizations are applicable.
Some of the generic files still contain SSE2 code, in particular
gimpoperationlayermode.c. The reason why it often works without is that
native gcc will usually pre-define SSE macros by default.
To check this: gcc -dM -E - < /dev/null | grep SSE
Yet I had a case on a small netbook where the SSE macros were not
pre-defined even though supported. Consequently the build failed.
Autoconf doc says: "Note that the source is evaluated exactly once, like
regular Autoconf macro arguments, and therefore (i) you may pass a macro
invocation, (ii) if not, be sure to double quote if needed."
move core photo/light adjustment ops like exposure and color temperature to the
topmost section of the menu, and move the more artistic threshold, colorize and
posterize options to the bottom section.
Largely based on a patch by Ell, with the enum type renamed and
various small changes. Adds another axis of configurability to the
existing layer mode madness, and is WIP too.
Commit e518b97 broke Win32 compilation with a non-defined variable
"monitor". I made a dirty "fix" by using shootvals->monitor.
Apparently, seeing previous comment, that is probably not the right
value but Mitch is on it and I leave him work it out.
At least now it builds.
We can actually group modules together to mark their relationship,
and easily deactivate them together if needed.
I grouped all Python modules, Exiv2 under GEXiv2, ilmbase under
openEXR, and finally libpng and lcms2 under a "duplicate-dependencies"
module to indicate that these modules are available in the runtime
(under a lower version, below our requirements) so we should check
whether to remove them, upon runtime update.
Ell