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Clamp Grain Extract, Grain Merge and Divide. 

* app/gegl/gimpoperationpointlayermode.c: Clamp Grain Extract,
Grain Merge and Divide.

svn path=/trunk/; revision=27425
This commit is contained in:
Martin Nordholts 2008-10-26 20:36:25 +00:00
parent ef66f5423f
commit c13cfffad7
2 changed files with 46 additions and 6 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2008-10-26 Martin Nordholts <martinn@svn.gnome.org>
* app/gegl/gimpoperationpointlayermode.c: Clamp Grain Extract,
Grain Merge and Divide.
2008-10-26 Michael Natterer <mitch@gimp.org>
* app/tools/gimptexttool.c: some formatting cleanup.

47
app/gegl/gimpoperationpointlayermode.c
View File

@ -281,17 +281,52 @@ gimp_operation_point_layer_mode_process (GeglOperation *operation,
else
outC = inC + layC - 2 * layC * inA);
/* Derieved from SVG 1.2 formulas, f(Sc, Dc) = Dc - Sc + 0.5 */
/* Custom SVG 1.2:
*
* if Dc - Sc + 0.5 >= 1
* f(Sc, Dc) = 1
* otherwise if Dc - Sc + 0.5 <= 0
* f(Sc, Dc) = 0
* otherwise
* f(Sc, Dc) = f(Sc, Dc) = Dc - Sc + 0.5
*/
BLEND (GIMP_GRAIN_EXTRACT_MODE,
outC = inC + layC - 2 * layC * inA + 0.5 * inA * layA);
if (inC * layA - layC * inA + 0.5 * layA * inA >= layA * inA)
outC = layA * inA + layC * (1 - inA) + inC * (1 - layA);
else if (inC * layA - layC * inA + 0.5 * layA * inA <= 0)
outC = layC * (1 - inA) + inC * (1 - layA);
else
outC = inC + layC - 2 * layC * inA + 0.5 * inA * layA);
/* Derieved from SVG 1.2 formulas, f(Sc, Dc) = Dc + Sc - 0.5 */
/* Custom SVG 1.2:
*
* if Dc + Sc - 0.5 >= 1
* f(Sc, Dc) = 1
* otherwise if Dc + Sc - 0.5 <= 0
* f(Sc, Dc) = 0
* otherwise
* f(Sc, Dc) = f(Sc, Dc) = Dc + Sc - 0.5
*/
BLEND (GIMP_GRAIN_MERGE_MODE,
outC = inC + layC - 0.5 * inA * layA);
if (inC * layA + layC * inA - 0.5 * layA * inA >= layA * inA)
outC = layA * inA + layC * (1 - inA) + inC * (1 - layA);
else if (inC * layA + layC * inA - 0.5 * layA * inA <= 0)
outC = layC * (1 - inA) + inC * (1 - layA);
else
outC = inC + layC - 0.5 * inA * layA);
/* Derieved from SVG 1.2 formulas, f(Sc, Dc) = Dc / Sc */
/* Custom SVG 1.2:
*
* if Dc / Sc > 1
* f(Sc, Dc) = 1
* otherwise
* f(Sc, Dc) = Dc / Sc
*/
BLEND (GIMP_DIVIDE_MODE,
outC = inC * layA * layA / layC + layC * (1 - inA) + inC * (1 - layA));
if (in[c] / lay[c] > in[A] / lay[A])
outC = layA * inA + layC * (1 - inA) + inC * (1 - layA);
else
outC = inC * layA * layA / layC + layC * (1 - inA) + inC * (1 - layA));
case GIMP_HUE_MODE:
case GIMP_SATURATION_MODE: