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-rw-r--r--app/core/gimpdrawable-gradient.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/app/core/gimpdrawable-gradient.c b/app/core/gimpdrawable-gradient.c
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+++ b/app/core/gimpdrawable-gradient.c
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+/* 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;
+ }
+}
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