Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 434 insertions, 0 deletions

diff --git a/app/operations/layer-modes/gimpoperationlayermode-composite.c b/app/operations/layer-modes/gimpoperationlayermode-composite.c
new file mode 100644
index 0000000..4275818
--- /dev/null
+++ b/app/operations/layer-modes/gimpoperationlayermode-composite.c
@@ -0,0 +1,434 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlayermode-composite.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *               2017 Øyvind Kolås <pippin@gimp.org>
+ *               2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl-plugin.h>
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "../operations-types.h"
+
+#include "gimpoperationlayermode-composite.h"
+
+
+/*  non-subtractive compositing functions.  these functions expect comp[ALPHA]
+ *  to be the same as layer[ALPHA].  when in[ALPHA] or layer[ALPHA] are zero,
+ *  the value of comp[RED..BLUE] is unconstrained (in particular, it may be
+ *  NaN).
+ */
+
+
+void
+gimp_operation_layer_mode_composite_union (const gfloat *in,
+                                           const gfloat *layer,
+                                           const gfloat *comp,
+                                           const gfloat *mask,
+                                           gfloat        opacity,
+                                           gfloat       *out,
+                                           gint          samples)
+{
+  while (samples--)
+    {
+      gfloat new_alpha;
+      gfloat in_alpha    = in[ALPHA];
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      new_alpha = layer_alpha + (1.0f - layer_alpha) * in_alpha;
+
+      if (layer_alpha == 0.0f || new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in_alpha == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gfloat ratio = layer_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = ratio * (in_alpha * (comp[b] - layer[b]) + layer[b] - in[b]) + in[b];
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_backdrop (const gfloat *in,
+                                                      const gfloat *layer,
+                                                      const gfloat *comp,
+                                                      const gfloat *mask,
+                                                      gfloat        opacity,
+                                                      gfloat       *out,
+                                                      gint          samples)
+{
+  while (samples--)
+    {
+      gfloat layer_alpha = comp[ALPHA] * opacity;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      if (in[ALPHA] == 0.0f || layer_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * layer_alpha + in[b] * (1.0f - layer_alpha);
+        }
+
+      out[ALPHA] = in[ALPHA];
+
+      in   += 4;
+      comp += 4;
+      out  += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_layer (const gfloat *in,
+                                                   const gfloat *layer,
+                                                   const gfloat *comp,
+                                                   const gfloat *mask,
+                                                   gfloat        opacity,
+                                                   gfloat       *out,
+                                                   gint          samples)
+{
+  while (samples--)
+    {
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      if (layer_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in[ALPHA] == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gint b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * in[ALPHA] + layer[b] * (1.0f - in[ALPHA]);
+        }
+
+      out[ALPHA] = layer_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_intersection (const gfloat *in,
+                                                  const gfloat *layer,
+                                                  const gfloat *comp,
+                                                  const gfloat *mask,
+                                                  gfloat        opacity,
+                                                  gfloat       *out,
+                                                  gint          samples)
+{
+  while (samples--)
+    {
+      gfloat new_alpha = in[ALPHA] * comp[ALPHA] * opacity;
+
+      if (mask)
+        new_alpha *= *mask;
+
+      if (new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          out[RED]   = comp[RED];
+          out[GREEN] = comp[GREEN];
+          out[BLUE]  = comp[BLUE];
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in   += 4;
+      comp += 4;
+      out  += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+/*  subtractive compositing functions.  these functions expect comp[ALPHA] to
+ *  specify the modified alpha of the overlapping content, as a fraction of the
+ *  original overlapping content (i.e., an alpha of 1.0 specifies that no
+ *  content is subtracted.)  when in[ALPHA] or layer[ALPHA] are zero, the value
+ *  of comp[RED..BLUE] is unconstrained (in particular, it may be NaN).
+ */
+
+void
+gimp_operation_layer_mode_composite_union_sub (const gfloat *in,
+                                               const gfloat *layer,
+                                               const gfloat *comp,
+                                               const gfloat *mask,
+                                               gfloat        opacity,
+                                               gfloat       *out,
+                                               gint          samples)
+{
+  while (samples--)
+    {
+      gfloat in_alpha    = in[ALPHA];
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+      gfloat comp_alpha  = comp[ALPHA];
+      gfloat new_alpha;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      new_alpha = in_alpha + layer_alpha -
+                  (2.0f - comp_alpha) * in_alpha * layer_alpha;
+
+      if (layer_alpha == 0.0f || new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in_alpha == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gfloat ratio       = in_alpha / new_alpha;
+          gfloat layer_coeff = 1.0f / in_alpha - 1.0f;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = ratio * (layer_alpha * (comp_alpha * comp[b] + layer_coeff * layer[b] - in[b]) + in[b]);
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_backdrop_sub (const gfloat *in,
+                                                          const gfloat *layer,
+                                                          const gfloat *comp,
+                                                          const gfloat *mask,
+                                                          gfloat        opacity,
+                                                          gfloat       *out,
+                                                          gint          samples)
+{
+  while (samples--)
+    {
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+      gfloat comp_alpha  = comp[ALPHA];
+      gfloat new_alpha;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      comp_alpha *= layer_alpha;
+
+      new_alpha = 1.0f - layer_alpha + comp_alpha;
+
+      if (in[ALPHA] == 0.0f || comp_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * ratio + in[b] * (1.0f - ratio);
+        }
+
+      new_alpha *= in[ALPHA];
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_clip_to_layer_sub (const gfloat *in,
+                                                       const gfloat *layer,
+                                                       const gfloat *comp,
+                                                       const gfloat *mask,
+                                                       gfloat        opacity,
+                                                       gfloat       *out,
+                                                       gint          samples)
+{
+  while (samples--)
+    {
+      gfloat in_alpha    = in[ALPHA];
+      gfloat layer_alpha = layer[ALPHA] * opacity;
+      gfloat comp_alpha  = comp[ALPHA];
+      gfloat new_alpha;
+
+      if (mask)
+        layer_alpha *= *mask;
+
+      comp_alpha *= in_alpha;
+
+      new_alpha = 1.0f - in_alpha + comp_alpha;
+
+      if (layer_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else if (in_alpha == 0.0f)
+        {
+          out[RED]   = layer[RED];
+          out[GREEN] = layer[GREEN];
+          out[BLUE]  = layer[BLUE];
+        }
+      else
+        {
+          gfloat ratio = comp_alpha / new_alpha;
+          gint   b;
+
+          for (b = RED; b < ALPHA; b++)
+            out[b] = comp[b] * ratio + layer[b] * (1.0f - ratio);
+        }
+
+      new_alpha *= layer_alpha;
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}
+
+void
+gimp_operation_layer_mode_composite_intersection_sub (const gfloat *in,
+                                                      const gfloat *layer,
+                                                      const gfloat *comp,
+                                                      const gfloat *mask,
+                                                      gfloat        opacity,
+                                                      gfloat       *out,
+                                                      gint          samples)
+{
+  while (samples--)
+    {
+      gfloat new_alpha = in[ALPHA] * layer[ALPHA] * comp[ALPHA] * opacity;
+
+      if (mask)
+        new_alpha *= *mask;
+
+      if (new_alpha == 0.0f)
+        {
+          out[RED]   = in[RED];
+          out[GREEN] = in[GREEN];
+          out[BLUE]  = in[BLUE];
+        }
+      else
+        {
+          out[RED]   = comp[RED];
+          out[GREEN] = comp[GREEN];
+          out[BLUE]  = comp[BLUE];
+        }
+
+      out[ALPHA] = new_alpha;
+
+      in    += 4;
+      layer += 4;
+      comp  += 4;
+      out   += 4;
+
+      if (mask)
+        mask++;
+    }
+}