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-rw-r--r--app/paint/gimpconvolve.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/app/paint/gimpconvolve.c b/app/paint/gimpconvolve.c
new file mode 100644
index 0000000..f2eea47
--- /dev/null
+++ b/app/paint/gimpconvolve.c
@@ -0,0 +1,277 @@
+/* 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 <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "paint-types.h"
+
+#include "gegl/gimp-gegl-loops.h"
+
+#include "core/gimp.h"
+#include "core/gimpbrush.h"
+#include "core/gimpdrawable.h"
+#include "core/gimpdynamics.h"
+#include "core/gimpimage.h"
+#include "core/gimppickable.h"
+#include "core/gimpsymmetry.h"
+#include "core/gimptempbuf.h"
+
+#include "gimpconvolve.h"
+#include "gimpconvolveoptions.h"
+
+#include "gimp-intl.h"
+
+
+#define FIELD_COLS 4
+#define MIN_BLUR 64 /* (8/9 original pixel) */
+#define MAX_BLUR 0.25 /* (1/33 original pixel) */
+#define MIN_SHARPEN -512
+#define MAX_SHARPEN -64
+
+
+static void gimp_convolve_paint (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ GimpPaintState paint_state,
+ guint32 time);
+static void gimp_convolve_motion (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym);
+
+static void gimp_convolve_calculate_matrix (GimpConvolve *convolve,
+ GimpConvolveType type,
+ gint radius_x,
+ gint radius_y,
+ gdouble rate);
+static gdouble gimp_convolve_sum_matrix (const gfloat *matrix);
+
+
+G_DEFINE_TYPE (GimpConvolve, gimp_convolve, GIMP_TYPE_BRUSH_CORE)
+
+
+void
+gimp_convolve_register (Gimp *gimp,
+ GimpPaintRegisterCallback callback)
+{
+ (* callback) (gimp,
+ GIMP_TYPE_CONVOLVE,
+ GIMP_TYPE_CONVOLVE_OPTIONS,
+ "gimp-convolve",
+ _("Convolve"),
+ "gimp-tool-blur");
+}
+
+static void
+gimp_convolve_class_init (GimpConvolveClass *klass)
+{
+ GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
+
+ paint_core_class->paint = gimp_convolve_paint;
+}
+
+static void
+gimp_convolve_init (GimpConvolve *convolve)
+{
+ gint i;
+
+ for (i = 0; i < 9; i++)
+ convolve->matrix[i] = 1.0;
+
+ convolve->matrix_divisor = 9.0;
+}
+
+static void
+gimp_convolve_paint (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ GimpPaintState paint_state,
+ guint32 time)
+{
+ switch (paint_state)
+ {
+ case GIMP_PAINT_STATE_MOTION:
+ gimp_convolve_motion (paint_core, drawable, paint_options, sym);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void
+gimp_convolve_motion (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym)
+{
+ GimpConvolve *convolve = GIMP_CONVOLVE (paint_core);
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
+ GimpConvolveOptions *options = GIMP_CONVOLVE_OPTIONS (paint_options);
+ GimpContext *context = GIMP_CONTEXT (paint_options);
+ GimpDynamics *dynamics = GIMP_BRUSH_CORE (paint_core)->dynamics;
+ GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
+ GeglBuffer *paint_buffer;
+ gint paint_buffer_x;
+ gint paint_buffer_y;
+ GimpTempBuf *temp_buf;
+ GeglBuffer *convolve_buffer;
+ gdouble fade_point;
+ gdouble opacity;
+ gdouble rate;
+ const GimpCoords *coords;
+ gint paint_width, paint_height;
+ gint n_strokes;
+ gint i;
+
+ fade_point = gimp_paint_options_get_fade (paint_options, image,
+ paint_core->pixel_dist);
+
+ coords = gimp_symmetry_get_origin (sym);
+ opacity = gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_OPACITY,
+ coords,
+ paint_options,
+ fade_point);
+ if (opacity == 0.0)
+ return;
+
+ gimp_brush_core_eval_transform_dynamics (GIMP_BRUSH_CORE (paint_core),
+ drawable,
+ paint_options,
+ coords);
+ n_strokes = gimp_symmetry_get_size (sym);
+ for (i = 0; i < n_strokes; i++)
+ {
+ coords = gimp_symmetry_get_coords (sym, i);
+
+ gimp_brush_core_eval_transform_symmetry (brush_core, sym, i);
+
+ paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
+ paint_options,
+ GIMP_LAYER_MODE_NORMAL,
+ coords,
+ &paint_buffer_x,
+ &paint_buffer_y,
+ &paint_width,
+ &paint_height);
+ if (! paint_buffer)
+ continue;
+
+ rate = (options->rate *
+ gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_RATE,
+ coords,
+ paint_options,
+ fade_point));
+
+ gimp_convolve_calculate_matrix (convolve, options->type,
+ gimp_brush_get_width (brush_core->brush) / 2,
+ gimp_brush_get_height (brush_core->brush) / 2,
+ rate);
+
+ /* need a linear buffer for gimp_gegl_convolve() */
+ temp_buf = gimp_temp_buf_new (gegl_buffer_get_width (paint_buffer),
+ gegl_buffer_get_height (paint_buffer),
+ gegl_buffer_get_format (paint_buffer));
+ convolve_buffer = gimp_temp_buf_create_buffer (temp_buf);
+ gimp_temp_buf_unref (temp_buf);
+
+ gimp_gegl_buffer_copy (
+ gimp_drawable_get_buffer (drawable),
+ GEGL_RECTANGLE (paint_buffer_x,
+ paint_buffer_y,
+ gegl_buffer_get_width (paint_buffer),
+ gegl_buffer_get_height (paint_buffer)),
+ GEGL_ABYSS_NONE,
+ convolve_buffer,
+ GEGL_RECTANGLE (0, 0, 0, 0));
+
+ gimp_gegl_convolve (convolve_buffer,
+ GEGL_RECTANGLE (0, 0,
+ gegl_buffer_get_width (convolve_buffer),
+ gegl_buffer_get_height (convolve_buffer)),
+ paint_buffer,
+ GEGL_RECTANGLE (0, 0,
+ gegl_buffer_get_width (paint_buffer),
+ gegl_buffer_get_height (paint_buffer)),
+ convolve->matrix, 3, convolve->matrix_divisor,
+ GIMP_NORMAL_CONVOL, TRUE);
+
+ g_object_unref (convolve_buffer);
+
+ gimp_brush_core_replace_canvas (brush_core, drawable,
+ coords,
+ MIN (opacity, GIMP_OPACITY_OPAQUE),
+ gimp_context_get_opacity (context),
+ gimp_paint_options_get_brush_mode (paint_options),
+ 1.0,
+ GIMP_PAINT_INCREMENTAL);
+ }
+}
+
+static void
+gimp_convolve_calculate_matrix (GimpConvolve *convolve,
+ GimpConvolveType type,
+ gint radius_x,
+ gint radius_y,
+ gdouble rate)
+{
+ /* find percent of tool pressure */
+ const gdouble percent = MIN (rate / 100.0, 1.0);
+
+ convolve->matrix[0] = (radius_x && radius_y) ? 1.0 : 0.0;
+ convolve->matrix[1] = (radius_y) ? 1.0 : 0.0;
+ convolve->matrix[2] = (radius_x && radius_y) ? 1.0 : 0.0;
+ convolve->matrix[3] = (radius_x) ? 1.0 : 0.0;
+
+ /* get the appropriate convolution matrix and size and divisor */
+ switch (type)
+ {
+ case GIMP_CONVOLVE_BLUR:
+ convolve->matrix[4] = MIN_BLUR + percent * (MAX_BLUR - MIN_BLUR);
+ break;
+
+ case GIMP_CONVOLVE_SHARPEN:
+ convolve->matrix[4] = MIN_SHARPEN + percent * (MAX_SHARPEN - MIN_SHARPEN);
+ break;
+ }
+
+ convolve->matrix[5] = (radius_x) ? 1.0 : 0.0;
+ convolve->matrix[6] = (radius_x && radius_y) ? 1.0 : 0.0;
+ convolve->matrix[7] = (radius_y) ? 1.0 : 0.0;
+ convolve->matrix[8] = (radius_x && radius_y) ? 1.0 : 0.0;
+
+ convolve->matrix_divisor = gimp_convolve_sum_matrix (convolve->matrix);
+}
+
+static gdouble
+gimp_convolve_sum_matrix (const gfloat *matrix)
+{
+ gdouble sum = 0.0;
+ gint i;
+
+ for (i = 0; i < 9; i++)
+ sum += matrix[i];
+
+ return sum;
+}
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