Adding upstream version 2.10.22.upstream/2.10.22upstream

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

1 files changed, 313 insertions, 0 deletions

diff --git a/app/core/gimpdrawable-gradient.c b/app/core/gimpdrawable-gradient.c
new file mode 100644
index 0000000..2d7cbe8
--- /dev/null
+++ b/app/core/gimpdrawable-gradient.c
@@ -0,0 +1,313 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "core-types.h"
+
+#include "gegl/gimp-gegl-apply-operation.h"
+#include "gegl/gimp-gegl-loops.h"
+#include "gegl/gimp-gegl-utils.h"
+
+#include "operations/layer-modes/gimp-layer-modes.h"
+
+#include "gimp.h"
+#include "gimpchannel.h"
+#include "gimpcontext.h"
+#include "gimpdrawable-gradient.h"
+#include "gimpgradient.h"
+#include "gimpimage.h"
+#include "gimpprogress.h"
+
+#include "gimp-intl.h"
+
+
+/*  public functions  */
+
+void
+gimp_drawable_gradient (GimpDrawable                *drawable,
+                        GimpContext                 *context,
+                        GimpGradient                *gradient,
+                        GeglDistanceMetric           metric,
+                        GimpLayerMode                paint_mode,
+                        GimpGradientType             gradient_type,
+                        gdouble                      opacity,
+                        gdouble                      offset,
+                        GimpRepeatMode               repeat,
+                        gboolean                     reverse,
+                        GimpGradientBlendColorSpace  blend_color_space,
+                        gboolean                     supersample,
+                        gint                         max_depth,
+                        gdouble                      threshold,
+                        gboolean                     dither,
+                        gdouble                      startx,
+                        gdouble                      starty,
+                        gdouble                      endx,
+                        gdouble                      endy,
+                        GimpProgress                *progress)
+{
+  GimpImage  *image;
+  GeglBuffer *buffer;
+  GeglBuffer *shapeburst = NULL;
+  GeglNode   *render;
+  gint        x, y, width, height;
+
+  g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
+  g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
+  g_return_if_fail (GIMP_IS_CONTEXT (context));
+  g_return_if_fail (GIMP_IS_GRADIENT (gradient));
+  g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
+
+  image = gimp_item_get_image (GIMP_ITEM (drawable));
+
+  if (! gimp_item_mask_intersect (GIMP_ITEM (drawable), &x, &y, &width, &height))
+    return;
+
+  gimp_set_busy (image->gimp);
+
+  /*  Always create an alpha temp buf (for generality) */
+  buffer = gegl_buffer_new (GEGL_RECTANGLE (x, y, width, height),
+                            gimp_drawable_get_format_with_alpha (drawable));
+
+  if (gradient_type >= GIMP_GRADIENT_SHAPEBURST_ANGULAR &&
+      gradient_type <= GIMP_GRADIENT_SHAPEBURST_DIMPLED)
+    {
+      shapeburst =
+        gimp_drawable_gradient_shapeburst_distmap (drawable, metric,
+                                                   GEGL_RECTANGLE (x, y, width, height),
+                                                   progress);
+    }
+
+  gimp_drawable_gradient_adjust_coords (drawable,
+                                        gradient_type,
+                                        GEGL_RECTANGLE (x, y, width, height),
+                                        &startx, &starty, &endx, &endy);
+
+  render = gegl_node_new_child (NULL,
+                                "operation",                  "gimp:gradient",
+                                "context",                    context,
+                                "gradient",                   gradient,
+                                "start-x",                    startx,
+                                "start-y",                    starty,
+                                "end-x",                      endx,
+                                "end-y",                      endy,
+                                "gradient-type",              gradient_type,
+                                "gradient-repeat",            repeat,
+                                "offset",                     offset,
+                                "gradient-reverse",           reverse,
+                                "gradient-blend-color-space", blend_color_space,
+                                "supersample",                supersample,
+                                "supersample-depth",          max_depth,
+                                "supersample-threshold",      threshold,
+                                "dither",                     dither,
+                                NULL);
+
+  gimp_gegl_apply_operation (shapeburst, progress, C_("undo-type", "Gradient"),
+                             render,
+                             buffer, GEGL_RECTANGLE (x, y, width, height),
+                             FALSE);
+
+  g_object_unref (render);
+
+  if (shapeburst)
+    g_object_unref (shapeburst);
+
+  gimp_drawable_apply_buffer (drawable, buffer,
+                              GEGL_RECTANGLE (x, y, width, height),
+                              TRUE, C_("undo-type", "Gradient"),
+                              opacity, paint_mode,
+                              GIMP_LAYER_COLOR_SPACE_AUTO,
+                              GIMP_LAYER_COLOR_SPACE_AUTO,
+                              gimp_layer_mode_get_paint_composite_mode (paint_mode),
+                              NULL, x, y);
+
+  gimp_drawable_update (drawable, x, y, width, height);
+
+  g_object_unref (buffer);
+
+  gimp_unset_busy (image->gimp);
+}
+
+GeglBuffer *
+gimp_drawable_gradient_shapeburst_distmap (GimpDrawable        *drawable,
+                                           GeglDistanceMetric   metric,
+                                           const GeglRectangle *region,
+                                           GimpProgress        *progress)
+{
+  GimpChannel *mask;
+  GimpImage   *image;
+  GeglBuffer  *dist_buffer;
+  GeglBuffer  *temp_buffer;
+  GeglNode    *shapeburst;
+
+  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
+  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
+  g_return_val_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress), NULL);
+
+  image = gimp_item_get_image (GIMP_ITEM (drawable));
+
+  /*  allocate the distance map  */
+  dist_buffer = gegl_buffer_new (region, babl_format ("Y float"));
+
+  /*  allocate the selection mask copy  */
+  temp_buffer = gegl_buffer_new (region, babl_format ("Y float"));
+
+  mask = gimp_image_get_mask (image);
+
+  /*  If the image mask is not empty, use it as the shape burst source  */
+  if (! gimp_channel_is_empty (mask))
+    {
+      gint x, y, width, height;
+      gint off_x, off_y;
+
+      gimp_item_mask_intersect (GIMP_ITEM (drawable), &x, &y, &width, &height);
+      gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
+
+      /*  copy the mask to the temp mask  */
+      gimp_gegl_buffer_copy (
+        gimp_drawable_get_buffer (GIMP_DRAWABLE (mask)),
+        GEGL_RECTANGLE (x + off_x, y + off_y, width, height),
+        GEGL_ABYSS_NONE, temp_buffer, region);
+    }
+  else
+    {
+      /*  If the intended drawable has an alpha channel, use that  */
+      if (gimp_drawable_has_alpha (drawable))
+        {
+          const Babl *component_format;
+
+          component_format = babl_format ("A float");
+
+          /*  extract the aplha into the temp mask  */
+          gegl_buffer_set_format (temp_buffer, component_format);
+          gimp_gegl_buffer_copy (gimp_drawable_get_buffer (drawable), region,
+                                 GEGL_ABYSS_NONE,
+                                 temp_buffer, region);
+          gegl_buffer_set_format (temp_buffer, NULL);
+        }
+      else
+        {
+          GeglColor *white = gegl_color_new ("white");
+
+          /*  Otherwise, just fill the shapeburst to white  */
+          gegl_buffer_set_color (temp_buffer, NULL, white);
+          g_object_unref (white);
+        }
+    }
+
+  shapeburst = gegl_node_new_child (NULL,
+                                    "operation", "gegl:distance-transform",
+                                    "normalize", TRUE,
+                                    "metric",    metric,
+                                    NULL);
+
+  if (progress)
+    gimp_gegl_progress_connect (shapeburst, progress,
+                                _("Calculating distance map"));
+
+  gimp_gegl_apply_operation (temp_buffer, NULL, NULL,
+                             shapeburst,
+                             dist_buffer, region, FALSE);
+
+  g_object_unref (shapeburst);
+
+  g_object_unref (temp_buffer);
+
+  return dist_buffer;
+}
+
+void
+gimp_drawable_gradient_adjust_coords (GimpDrawable        *drawable,
+                                      GimpGradientType     gradient_type,
+                                      const GeglRectangle *region,
+                                      gdouble             *startx,
+                                      gdouble             *starty,
+                                      gdouble             *endx,
+                                      gdouble             *endy)
+{
+  g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
+  g_return_if_fail (region != NULL);
+  g_return_if_fail (startx != NULL);
+  g_return_if_fail (starty != NULL);
+  g_return_if_fail (endx != NULL);
+  g_return_if_fail (endy != NULL);
+
+  /* we potentially adjust the gradient coordinates according to the gradient
+   * type, so that in cases where the gradient span is not related to the
+   * segment length, the gradient cache (in GimpOperationGradient) is big
+   * enough not to produce banding.
+   */
+
+  switch (gradient_type)
+    {
+    /* for conical gradients, use a segment with the original origin and
+     * direction, whose length is the circumference of the largest circle
+     * centered at the origin, passing through one of the regions's vertices.
+     */
+    case GIMP_GRADIENT_CONICAL_SYMMETRIC:
+    case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
+      {
+        gdouble     r = 0.0;
+        GimpVector2 v;
+
+        r = MAX (r, hypot (region->x - *startx,
+                           region->y - *starty));
+        r = MAX (r, hypot (region->x + region->width - *startx,
+                           region->y - *starty));
+        r = MAX (r, hypot (region->x - *startx,
+                           region->y + region->height - *starty));
+        r = MAX (r, hypot (region->x + region->width - *startx,
+                           region->y + region->height - *starty));
+
+        /* symmetric conical gradients only span half a revolution, and
+         * therefore require only half the cache size.
+         */
+        if (gradient_type == GIMP_GRADIENT_CONICAL_SYMMETRIC)
+          r /= 2.0;
+
+        gimp_vector2_set (&v, *endx - *startx, *endy - *starty);
+        gimp_vector2_normalize (&v);
+        gimp_vector2_mul (&v, 2.0 * G_PI * r);
+
+        *endx = *startx + v.x;
+        *endy = *starty + v.y;
+      }
+      break;
+
+    /* for shaped gradients, only the segment's length matters; use the
+     * regions's diagonal, which is the largest possible distance between two
+     * points in the region.
+     */
+    case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
+    case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
+    case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
+      *startx = region->x;
+      *starty = region->y;
+      *endx   = region->x + region->width;
+      *endy   = region->y + region->height;
+      break;
+
+    default:
+      break;
+    }
+}