[gimp/blend-tool-fun: 4/8] app: Add a gegl op to render gradients
- From: Michael Henning <mhenning src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gimp/blend-tool-fun: 4/8] app: Add a gegl op to render gradients
- Date: Mon, 23 Jun 2014 02:00:28 +0000 (UTC)
commit efec6a1fb1cb66c55616682e325379e5be76f430
Author: Michael Henning <drawoc darkrefraction com>
Date: Thu Jun 12 20:57:26 2014 -0400
app: Add a gegl op to render gradients
app/operations/Makefile.am | 2 +
app/operations/gimp-operations.c | 2 +
app/operations/gimpoperationblend.c | 1132 +++++++++++++++++++++++++++++++++++
app/operations/gimpoperationblend.h | 66 ++
4 files changed, 1202 insertions(+), 0 deletions(-)
---
diff --git a/app/operations/Makefile.am b/app/operations/Makefile.am
index d5998fd..e46001f 100644
--- a/app/operations/Makefile.am
+++ b/app/operations/Makefile.am
@@ -44,6 +44,8 @@ libappoperations_generic_a_sources = \
gimpthresholdconfig.c \
gimpthresholdconfig.h \
\
+ gimpoperationblend.c \
+ gimpoperationblend.h \
gimpoperationborder.c \
gimpoperationborder.h \
gimpoperationcagecoefcalc.c \
diff --git a/app/operations/gimp-operations.c b/app/operations/gimp-operations.c
index 6b35ec9..1e81e47 100644
--- a/app/operations/gimp-operations.c
+++ b/app/operations/gimp-operations.c
@@ -27,6 +27,7 @@
#include "gimp-operations.h"
+#include "gimpoperationblend.h"
#include "gimpoperationborder.h"
#include "gimpoperationcagecoefcalc.h"
#include "gimpoperationcagetransform.h"
@@ -82,6 +83,7 @@
void
gimp_operations_init (void)
{
+ g_type_class_ref (GIMP_TYPE_OPERATION_BLEND);
g_type_class_ref (GIMP_TYPE_OPERATION_BORDER);
g_type_class_ref (GIMP_TYPE_OPERATION_CAGE_COEF_CALC);
g_type_class_ref (GIMP_TYPE_OPERATION_CAGE_TRANSFORM);
diff --git a/app/operations/gimpoperationblend.c b/app/operations/gimpoperationblend.c
new file mode 100644
index 0000000..69d4305
--- /dev/null
+++ b/app/operations/gimpoperationblend.c
@@ -0,0 +1,1132 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * Largely based on gimpdrawable-blend.c
+ *
+ * gimpoperationblend.c
+ * Copyright (C) 2014 Michael Henning <drawoc darkrefraction com>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpgradient.h"
+
+#include "gimpoperationblend.h"
+
+#include "gimp-intl.h"
+
+//#define USE_GRADIENT_CACHE 1
+
+enum
+{
+ PROP_0,
+ PROP_GRADIENT,
+ PROP_START_X,
+ PROP_START_Y,
+ PROP_END_X,
+ PROP_END_Y,
+ PROP_GRADIENT_TYPE,
+ PROP_REPEAT_MODE,
+ PROP_OFFSET,
+ PROP_REVERSE,
+ PROP_SUPERSAMPLE,
+ PROP_MAX_DEPTH,
+ PROP_THRESHOLD,
+ PROP_DITHER
+};
+
+typedef struct
+{
+ GimpGradient *gradient;
+ gboolean reverse;
+#ifdef USE_GRADIENT_CACHE
+ GimpRGB *gradient_cache;
+ gint gradient_cache_size;
+#endif
+ gdouble offset;
+ gdouble sx, sy;
+ GimpGradientType gradient_type;
+ gdouble dist;
+ gdouble vec[2];
+ GimpRepeatMode repeat;
+ GRand *seed;
+ GeglBuffer *dist_buffer;
+} RenderBlendData;
+
+
+typedef struct
+{
+ GeglBuffer *buffer;
+ gfloat *row_data;
+ gint roi_x;
+ gint width;
+ GRand *dither_rand;
+} PutPixelData;
+
+
+/* local function prototypes */
+
+static void gimp_operation_blend_dispose (GObject *gobject);
+static void gimp_operation_blend_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_blend_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_operation_blend_prepare (GeglOperation *operation);
+
+static GeglRectangle gimp_operation_blend_get_bounding_box (GeglOperation *operation);
+
+static gdouble gradient_calc_conical_sym_factor (gdouble dist,
+ gdouble *axis,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_conical_asym_factor (gdouble dist,
+ gdouble *axis,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_square_factor (gdouble dist,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_radial_factor (gdouble dist,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_linear_factor (gdouble dist,
+ gdouble *vec,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_bilinear_factor (gdouble dist,
+ gdouble *vec,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_spiral_factor (gdouble dist,
+ gdouble *axis,
+ gdouble offset,
+ gdouble x,
+ gdouble y,
+ gboolean clockwise);
+
+static gdouble gradient_calc_shapeburst_angular_factor (GeglBuffer *dist_buffer,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_shapeburst_spherical_factor (GeglBuffer *dist_buffer,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_shapeburst_dimpled_factor (GeglBuffer *dist_buffer,
+ gdouble x,
+ gdouble y);
+
+static void gradient_render_pixel (gdouble x,
+ gdouble y,
+ GimpRGB *color,
+ gpointer render_data);
+
+static void gradient_put_pixel (gint x,
+ gint y,
+ GimpRGB *color,
+ gpointer put_pixel_data);
+
+static gboolean gimp_operation_blend_process (GeglOperation *operation,
+ GeglBuffer *output,
+ const GeglRectangle *result,
+ gint level);
+
+G_DEFINE_TYPE (GimpOperationBlend, gimp_operation_blend,
+ GEGL_TYPE_OPERATION_SOURCE)
+
+#define parent_class gimp_operation_blend_parent_class
+
+static void
+gimp_operation_blend_class_init (GimpOperationBlendClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+ GeglOperationSourceClass *source_class = GEGL_OPERATION_SOURCE_CLASS (klass);
+
+ object_class->dispose = gimp_operation_blend_dispose;
+ object_class->set_property = gimp_operation_blend_set_property;
+ object_class->get_property = gimp_operation_blend_get_property;
+
+ operation_class->prepare = gimp_operation_blend_prepare;
+ operation_class->get_bounding_box = gimp_operation_blend_get_bounding_box;
+
+ source_class->process = gimp_operation_blend_process;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:blend",
+ "categories", "gimp",
+ "description", "GIMP Blend operation",
+ NULL);
+
+ g_object_class_install_property (object_class, PROP_GRADIENT,
+ g_param_spec_object ("gradient",
+ "Gradient",
+ "A GimpGradient to render",
+ GIMP_TYPE_OBJECT,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_START_X,
+ g_param_spec_double ("start_x",
+ "Start X",
+ "X coordinate of the first point",
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_START_Y,
+ g_param_spec_double ("start_y",
+ "Start Y",
+ "Y coordinate of the first point",
+ -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_END_X,
+ g_param_spec_double ("end_x",
+ "End X",
+ "X coordinate of the second point",
+ -G_MAXDOUBLE, G_MAXDOUBLE, 200,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_END_Y,
+ g_param_spec_double ("end_y",
+ "End Y",
+ "Y coordinate of the second point",
+ -G_MAXDOUBLE, G_MAXDOUBLE, 200,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_GRADIENT_TYPE,
+ g_param_spec_enum ("gradient_type",
+ "Gradient Type",
+ "The type of gradient to render",
+ GIMP_TYPE_GRADIENT_TYPE,
+ GIMP_GRADIENT_LINEAR,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_REPEAT_MODE,
+ g_param_spec_enum ("repeat",
+ "Repeat mode",
+ "Repeat mode",
+ GIMP_TYPE_REPEAT_MODE,
+ GIMP_REPEAT_NONE,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_OFFSET,
+ g_param_spec_double ("offset",
+ "Offset",
+ "Offset relates to the starting and ending
coordinates "
+ "specified for the blend. This parameter is mode
dependent.",
+ 0, G_MAXDOUBLE, 0,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_REVERSE,
+ g_param_spec_boolean ("reverse",
+ "Reverse",
+ "Reverse the gradient",
+ FALSE,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_SUPERSAMPLE,
+ g_param_spec_boolean ("supersample",
+ "Supersample",
+ "Do adaptive supersampling",
+ FALSE,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_MAX_DEPTH,
+ g_param_spec_int ("max_depth",
+ "Max depth",
+ "Maximum recursion levels for supersampling",
+ 1, 9, 3,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_THRESHOLD,
+ g_param_spec_double ("threshold",
+ "Threshold",
+ "Supersampling threshold",
+ 0, 4, 0.20,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_DITHER,
+ g_param_spec_boolean ("dither",
+ "Dither",
+ "Use dithering to reduce banding",
+ FALSE,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_blend_init (GimpOperationBlend *self)
+{
+}
+
+static void
+gimp_operation_blend_dispose (GObject *object)
+{
+ GimpOperationBlend *self = GIMP_OPERATION_BLEND (object);
+ g_clear_object (&self->gradient);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_blend_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationBlend *self = GIMP_OPERATION_BLEND (object);
+
+ switch (property_id)
+ {
+ case PROP_GRADIENT:
+ g_value_set_object (value, self->gradient);
+ break;
+
+ case PROP_START_X:
+ g_value_set_double (value, self->start_x);
+ break;
+
+ case PROP_START_Y:
+ g_value_set_double (value, self->start_y);
+ break;
+
+ case PROP_END_X:
+ g_value_set_double (value, self->end_x);
+ break;
+
+ case PROP_END_Y:
+ g_value_set_double (value, self->end_y);
+ break;
+
+ case PROP_GRADIENT_TYPE:
+ g_value_set_enum (value, self->gradient_type);
+ break;
+
+ case PROP_REPEAT_MODE:
+ g_value_set_enum (value, self->repeat);
+ break;
+
+ case PROP_OFFSET:
+ g_value_set_double (value, self->offset);
+ break;
+
+ case PROP_REVERSE:
+ g_value_set_boolean (value, self->reverse);
+ break;
+
+ case PROP_SUPERSAMPLE:
+ g_value_set_boolean (value, self->supersample);
+ break;
+
+ case PROP_MAX_DEPTH:
+ g_value_set_int (value, self->max_depth);
+ break;
+
+ case PROP_THRESHOLD:
+ g_value_set_double (value, self->threshold);
+ break;
+
+ case PROP_DITHER:
+ g_value_set_boolean (value, self->dither);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_blend_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationBlend *self = GIMP_OPERATION_BLEND (object);
+
+ switch (property_id)
+ {
+ case PROP_GRADIENT:
+ {
+ GimpGradient *gradient = g_value_dup_object (value);
+ if (gradient && gimp_gradient_has_fg_bg_segments (gradient))
+ {
+ g_warning ("gimp:blend can't handle gradients with foreground or "
+ "background segments. Call gimp_gradient_flatten on "
+ "the gradient first");
+ g_object_unref (gradient);
+ }
+ else
+ {
+ if (self->gradient)
+ g_object_unref (self->gradient);
+
+ self->gradient = gradient;
+ }
+ }
+ break;
+
+ case PROP_START_X:
+ self->start_x = g_value_get_double (value);
+ break;
+
+ case PROP_START_Y:
+ self->start_y = g_value_get_double (value);
+ break;
+
+ case PROP_END_X:
+ self->end_x = g_value_get_double (value);
+ break;
+
+ case PROP_END_Y:
+ self->end_y = g_value_get_double (value);
+ break;
+
+ case PROP_GRADIENT_TYPE:
+ self->gradient_type = g_value_get_enum (value);
+ break;
+
+ case PROP_REPEAT_MODE:
+ self->repeat = g_value_get_enum (value);
+ break;
+
+ case PROP_OFFSET:
+ self->offset = g_value_get_double (value);
+ break;
+
+ case PROP_REVERSE:
+ self->reverse = g_value_get_boolean (value);
+ break;
+
+ case PROP_SUPERSAMPLE:
+ self->supersample = g_value_get_boolean (value);
+ break;
+
+ case PROP_MAX_DEPTH:
+ self->max_depth = g_value_get_int (value);
+ break;
+
+ case PROP_THRESHOLD:
+ self->threshold = g_value_get_double (value);
+ break;
+
+ case PROP_DITHER:
+ self->dither = g_value_get_boolean (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_blend_prepare (GeglOperation *operation)
+{
+ gegl_operation_set_format (operation, "output", babl_format ("R'G'B'A float"));
+}
+
+static GeglRectangle
+gimp_operation_blend_get_bounding_box (GeglOperation *operation)
+{
+ return gegl_rectangle_infinite_plane ();
+}
+
+static gdouble
+gradient_calc_conical_sym_factor (gdouble dist,
+ gdouble *axis,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else if ((x != 0) || (y != 0))
+ {
+ gdouble vec[2];
+ gdouble r;
+ gdouble rat;
+
+ /* Calculate offset from the start in pixels */
+
+ r = sqrt (SQR (x) + SQR (y));
+
+ vec[0] = x / r;
+ vec[1] = y / r;
+
+ rat = axis[0] * vec[0] + axis[1] * vec[1]; /* Dot product */
+
+ if (rat > 1.0)
+ rat = 1.0;
+ else if (rat < -1.0)
+ rat = -1.0;
+
+ /* This cool idea is courtesy Josh MacDonald,
+ * Ali Rahimi --- two more XCF losers. */
+
+ rat = acos (rat) / G_PI;
+ rat = pow (rat, (offset / 10.0) + 1.0);
+
+ return CLAMP (rat, 0.0, 1.0);
+ }
+ else
+ {
+ return 0.5;
+ }
+}
+
+static gdouble
+gradient_calc_conical_asym_factor (gdouble dist,
+ gdouble *axis,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else if (x != 0 || y != 0)
+ {
+ gdouble ang0, ang1;
+ gdouble ang;
+ gdouble rat;
+
+ ang0 = atan2 (axis[0], axis[1]) + G_PI;
+
+ ang1 = atan2 (x, y) + G_PI;
+
+ ang = ang1 - ang0;
+
+ if (ang < 0.0)
+ ang += (2.0 * G_PI);
+
+ rat = ang / (2.0 * G_PI);
+ rat = pow (rat, (offset / 10.0) + 1.0);
+
+ return CLAMP (rat, 0.0, 1.0);
+ }
+ else
+ {
+ return 0.5; /* We are on middle point */
+ }
+}
+
+static gdouble
+gradient_calc_square_factor (gdouble dist,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else
+ {
+ gdouble r;
+ gdouble rat;
+
+ /* Calculate offset from start as a value in [0, 1] */
+
+ offset = offset / 100.0;
+
+ r = MAX (abs (x), abs (y));
+ rat = r / dist;
+
+ if (rat < offset)
+ return 0.0;
+ else if (offset == 1.0)
+ return (rat >= 1.0) ? 1.0 : 0.0;
+ else
+ return (rat - offset) / (1.0 - offset);
+ }
+}
+
+static gdouble
+gradient_calc_radial_factor (gdouble dist,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else
+ {
+ gdouble r;
+ gdouble rat;
+
+ /* Calculate radial offset from start as a value in [0, 1] */
+
+ offset = offset / 100.0;
+
+ r = sqrt (SQR (x) + SQR (y));
+ rat = r / dist;
+
+ if (rat < offset)
+ return 0.0;
+ else if (offset == 1.0)
+ return (rat >= 1.0) ? 1.0 : 0.0;
+ else
+ return (rat - offset) / (1.0 - offset);
+ }
+}
+
+static gdouble
+gradient_calc_linear_factor (gdouble dist,
+ gdouble *vec,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else
+ {
+ gdouble r;
+ gdouble rat;
+
+ offset = offset / 100.0;
+
+ r = vec[0] * x + vec[1] * y;
+ rat = r / dist;
+
+ if (rat >= 0.0 && rat < offset)
+ return 0.0;
+ else if (offset == 1.0)
+ return (rat >= 1.0) ? 1.0 : 0.0;
+ else if (rat < 0.0)
+ return rat / (1.0 - offset);
+ else
+ return (rat - offset) / (1.0 - offset);
+ }
+}
+
+static gdouble
+gradient_calc_bilinear_factor (gdouble dist,
+ gdouble *vec,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else
+ {
+ gdouble r;
+ gdouble rat;
+
+ /* Calculate linear offset from the start line outward */
+
+ offset = offset / 100.0;
+
+ r = vec[0] * x + vec[1] * y;
+ rat = r / dist;
+
+ if (fabs (rat) < offset)
+ return 0.0;
+ else if (offset == 1.0)
+ return (rat == 1.0) ? 1.0 : 0.0;
+ else
+ return (fabs (rat) - offset) / (1.0 - offset);
+ }
+}
+
+static gdouble
+gradient_calc_spiral_factor (gdouble dist,
+ gdouble *axis,
+ gdouble offset,
+ gdouble x,
+ gdouble y,
+ gboolean clockwise)
+{
+ if (dist == 0.0)
+ {
+ return 0.0;
+ }
+ else if (x != 0.0 || y != 0.0)
+ {
+ gdouble ang0, ang1;
+ gdouble ang;
+ double r;
+
+ ang0 = atan2 (axis[0], axis[1]) + G_PI;
+ ang1 = atan2 (x, y) + G_PI;
+
+ if (clockwise)
+ ang = ang1 - ang0;
+ else
+ ang = ang0 - ang1;
+
+ if (ang < 0.0)
+ ang += (2.0 * G_PI);
+
+ r = sqrt (SQR (x) + SQR (y)) / dist;
+
+ return fmod (ang / (2.0 * G_PI) + r + offset, 1.0);
+ }
+ else
+ {
+ return 0.5 ; /* We are on the middle point */
+ }
+}
+
+static gdouble
+gradient_calc_shapeburst_angular_factor (GeglBuffer *dist_buffer,
+ gdouble x,
+ gdouble y)
+{
+ gint ix = CLAMP (x, 0.0, gegl_buffer_get_width (dist_buffer) - 0.7);
+ gint iy = CLAMP (y, 0.0, gegl_buffer_get_height (dist_buffer) - 0.7);
+ gfloat value;
+
+ gegl_buffer_get (dist_buffer, GEGL_RECTANGLE (ix, iy, 1, 1), 1.0,
+ NULL, &value,
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+ value = 1.0 - value;
+
+ return value;
+}
+
+
+static gdouble
+gradient_calc_shapeburst_spherical_factor (GeglBuffer *dist_buffer,
+ gdouble x,
+ gdouble y)
+{
+ gint ix = CLAMP (x, 0.0, gegl_buffer_get_width (dist_buffer) - 0.7);
+ gint iy = CLAMP (y, 0.0, gegl_buffer_get_height (dist_buffer) - 0.7);
+ gfloat value;
+
+ gegl_buffer_get (dist_buffer, GEGL_RECTANGLE (ix, iy, 1, 1), 1.0,
+ NULL, &value,
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+ value = 1.0 - sin (0.5 * G_PI * value);
+
+ return value;
+}
+
+
+static gdouble
+gradient_calc_shapeburst_dimpled_factor (GeglBuffer *dist_buffer,
+ gdouble x,
+ gdouble y)
+{
+ gint ix = CLAMP (x, 0.0, gegl_buffer_get_width (dist_buffer) - 0.7);
+ gint iy = CLAMP (y, 0.0, gegl_buffer_get_height (dist_buffer) - 0.7);
+ gfloat value;
+
+ gegl_buffer_get (dist_buffer, GEGL_RECTANGLE (ix, iy, 1, 1), 1.0,
+ NULL, &value,
+ GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+ value = cos (0.5 * G_PI * value);
+
+ return value;
+}
+
+static void
+gradient_render_pixel (gdouble x,
+ gdouble y,
+ GimpRGB *color,
+ gpointer render_data)
+{
+ RenderBlendData *rbd = render_data;
+ gdouble factor;
+
+ /* Calculate blending factor */
+
+ switch (rbd->gradient_type)
+ {
+ case GIMP_GRADIENT_LINEAR:
+ factor = gradient_calc_linear_factor (rbd->dist,
+ rbd->vec, rbd->offset,
+ x - rbd->sx, y - rbd->sy);
+ break;
+
+ case GIMP_GRADIENT_BILINEAR:
+ factor = gradient_calc_bilinear_factor (rbd->dist,
+ rbd->vec, rbd->offset,
+ x - rbd->sx, y - rbd->sy);
+ break;
+
+ case GIMP_GRADIENT_RADIAL:
+ factor = gradient_calc_radial_factor (rbd->dist,
+ rbd->offset,
+ x - rbd->sx, y - rbd->sy);
+ break;
+
+ case GIMP_GRADIENT_SQUARE:
+ factor = gradient_calc_square_factor (rbd->dist, rbd->offset,
+ x - rbd->sx, y - rbd->sy);
+ break;
+
+ case GIMP_GRADIENT_CONICAL_SYMMETRIC:
+ factor = gradient_calc_conical_sym_factor (rbd->dist,
+ rbd->vec, rbd->offset,
+ x - rbd->sx, y - rbd->sy);
+ break;
+
+ case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
+ factor = gradient_calc_conical_asym_factor (rbd->dist,
+ rbd->vec, rbd->offset,
+ x - rbd->sx, y - rbd->sy);
+ break;
+
+ case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
+ factor = gradient_calc_shapeburst_angular_factor (rbd->dist_buffer, x, y);
+ break;
+
+ case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
+ factor = gradient_calc_shapeburst_spherical_factor (rbd->dist_buffer, x, y);
+ break;
+
+ case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
+ factor = gradient_calc_shapeburst_dimpled_factor (rbd->dist_buffer, x, y);
+ break;
+
+ case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
+ factor = gradient_calc_spiral_factor (rbd->dist,
+ rbd->vec, rbd->offset,
+ x - rbd->sx, y - rbd->sy, TRUE);
+ break;
+
+ case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
+ factor = gradient_calc_spiral_factor (rbd->dist,
+ rbd->vec, rbd->offset,
+ x - rbd->sx, y - rbd->sy, FALSE);
+ break;
+
+ default:
+ g_return_if_reached ();
+ break;
+ }
+
+ /* Adjust for repeat */
+
+ switch (rbd->repeat)
+ {
+ case GIMP_REPEAT_TRUNCATE:
+ break;
+
+ case GIMP_REPEAT_NONE:
+ factor = CLAMP (factor, 0.0, 1.0);
+ break;
+
+ case GIMP_REPEAT_SAWTOOTH:
+ factor = factor - floor (factor);
+ break;
+
+ case GIMP_REPEAT_TRIANGULAR:
+ {
+ guint ifactor;
+
+ if (factor < 0.0)
+ factor = -factor;
+
+ ifactor = (guint) factor;
+ factor = factor - floor (factor);
+
+ if (ifactor & 1)
+ factor = 1.0 - factor;
+ }
+ break;
+ }
+
+ /* Blend the colors */
+
+ if (factor < 0.0 || factor > 1.0)
+ {
+ color->r = color->g = color->b = 0;
+ color->a = GIMP_OPACITY_TRANSPARENT;
+ }
+ else
+ {
+#ifdef USE_GRADIENT_CACHE
+ *color = rbd->gradient_cache[(gint) (factor * (rbd->gradient_cache_size - 1))];
+#else
+ gimp_gradient_get_color_at (rbd->gradient, NULL, NULL,
+ factor, rbd->reverse, color);
+#endif
+ }
+}
+
+static void
+gradient_put_pixel (gint x,
+ gint y,
+ GimpRGB *color,
+ gpointer put_pixel_data)
+{
+ PutPixelData *ppd = put_pixel_data;
+ const gint index = x - ppd->roi_x;
+ gfloat *dest = ppd->row_data + 4 * index;
+
+ if (ppd->dither_rand)
+ {
+ gint i = g_rand_int (ppd->dither_rand);
+
+ *dest++ = color->r + (gdouble) (i & 0xff) / 256.0 / 256.0; i >>= 8;
+ *dest++ = color->g + (gdouble) (i & 0xff) / 256.0 / 256.0; i >>= 8;
+ *dest++ = color->b + (gdouble) (i & 0xff) / 256.0 / 256.0; i >>= 8;
+ *dest++ = color->a + (gdouble) (i & 0xff) / 256.0 / 256.0;
+ }
+ else
+ {
+ *dest++ = color->r;
+ *dest++ = color->g;
+ *dest++ = color->b;
+ *dest++ = color->a;
+ }
+
+ /* Paint whole row if we are on the rightmost pixel */
+ if (index == (ppd->width - 1))
+ gegl_buffer_set (ppd->buffer, GEGL_RECTANGLE (ppd->roi_x, y, ppd->width, 1),
+ 0, babl_format ("R'G'B'A float"), ppd->row_data,
+ GEGL_AUTO_ROWSTRIDE);
+}
+
+static gboolean
+gimp_operation_blend_process (GeglOperation *operation,
+ GeglBuffer *output,
+ const GeglRectangle *result,
+ gint level)
+{
+ GimpOperationBlend *self = GIMP_OPERATION_BLEND (operation);
+
+ const gdouble sx = self->start_x;
+ const gdouble sy = self->start_y;
+ const gdouble ex = self->end_x;
+ const gdouble ey = self->end_y;
+
+ RenderBlendData rbd = { 0, };
+
+ rbd.gradient = NULL;
+ rbd.reverse = self->reverse;
+
+ if (self->gradient)
+ rbd.gradient = g_object_ref (self->gradient);
+ else
+ rbd.gradient = GIMP_GRADIENT (gimp_gradient_new (NULL, "Blend-Temp"));
+
+#ifdef USE_GRADIENT_CACHE
+ {
+ gint i;
+
+ rbd.gradient_cache_size = ceil (sqrt (SQR (sx - ex) + SQR (sy - ey)));
+ rbd.gradient_cache = g_new0 (GimpRGB, rbd.gradient_cache_size);
+
+ for (i = 0; i < rbd.gradient_cache_size; i++)
+ {
+ gdouble factor = (gdouble) i / (gdouble) (rbd.gradient_cache_size - 1);
+
+ gimp_gradient_get_color_at (rbd.gradient, NULL, NULL,
+ factor, rbd.reverse,
+ rbd.gradient_cache + i);
+ }
+ }
+#endif
+
+ /* Calculate type-specific parameters */
+
+ switch (self->gradient_type)
+ {
+ case GIMP_GRADIENT_RADIAL:
+ rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
+ break;
+
+ case GIMP_GRADIENT_SQUARE:
+ rbd.dist = MAX (fabs (ex - sx), fabs (ey - sy));
+ break;
+
+ case GIMP_GRADIENT_CONICAL_SYMMETRIC:
+ case GIMP_GRADIENT_CONICAL_ASYMMETRIC:
+ case GIMP_GRADIENT_SPIRAL_CLOCKWISE:
+ case GIMP_GRADIENT_SPIRAL_ANTICLOCKWISE:
+ case GIMP_GRADIENT_LINEAR:
+ case GIMP_GRADIENT_BILINEAR:
+ rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
+
+ if (rbd.dist > 0.0)
+ {
+ rbd.vec[0] = (ex - sx) / rbd.dist;
+ rbd.vec[1] = (ey - sy) / rbd.dist;
+ }
+
+ break;
+
+ case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
+ case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
+ case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
+ rbd.dist = sqrt (SQR (ex - sx) + SQR (ey - sy));
+ /*rbd.dist_buffer = gradient_precalc_shapeburst (image, drawable,
+ buffer_region,
+ rbd.dist, progress);*/
+ /* FIXME */
+ g_return_val_if_reached (FALSE);
+ break;
+
+ default:
+ g_return_val_if_reached (FALSE);
+ break;
+ }
+
+ /* Initialize render data */
+
+ rbd.offset = self->offset;
+ rbd.sx = self->start_x;
+ rbd.sy = self->start_y;
+ rbd.gradient_type = self->gradient_type;
+ rbd.repeat = self->repeat;
+
+ /* Render the gradient! */
+
+ if (self->supersample)
+ {
+ PutPixelData ppd = {0, };
+
+ ppd.buffer = output;
+ ppd.row_data = g_malloc (sizeof (float) * 4 * result->width);
+ ppd.roi_x = result->x;
+ ppd.width = result->width;
+ if (self->dither)
+ ppd.dither_rand = g_rand_new ();
+
+ gimp_adaptive_supersample_area (result->x, result->y,
+ result->x + result->width - 1,
+ result->y + result->height - 1,
+ self->max_depth, self->threshold,
+ gradient_render_pixel, &rbd,
+ gradient_put_pixel, &ppd,
+ NULL,
+ NULL);
+
+ if (self->dither)
+ g_rand_free (ppd.dither_rand);
+ g_free (ppd.row_data);
+ }
+ else
+ {
+ GeglBufferIterator *iter;
+ GeglRectangle *roi;
+
+ iter = gegl_buffer_iterator_new (output, result, 0,
+ babl_format ("R'G'B'A float"),
+ GEGL_BUFFER_WRITE, GEGL_ABYSS_NONE);
+ roi = &iter->roi[0];
+
+ if (self->dither)
+ rbd.seed = g_rand_new ();
+
+ while (gegl_buffer_iterator_next (iter))
+ {
+ gfloat *dest = iter->data[0];
+ gint endx = roi->x + roi->width;
+ gint endy = roi->y + roi->height;
+ gint x, y;
+
+ if (rbd.seed)
+ {
+ GRand *dither_rand = g_rand_new_with_seed (g_rand_int (rbd.seed));
+
+ for (y = roi->y; y < endy; y++)
+ for (x = roi->x; x < endx; x++)
+ {
+ GimpRGB color = { 0.0, 0.0, 0.0, 1.0 };
+ gint i = g_rand_int (dither_rand);
+
+ gradient_render_pixel (x, y, &color, &rbd);
+
+ *dest++ = color.r + (gdouble) (i & 0xff) / 256.0 / 256.0; i >>= 8;
+ *dest++ = color.g + (gdouble) (i & 0xff) / 256.0 / 256.0; i >>= 8;
+ *dest++ = color.b + (gdouble) (i & 0xff) / 256.0 / 256.0; i >>= 8;
+ *dest++ = color.a + (gdouble) (i & 0xff) / 256.0 / 256.0;
+ }
+
+ g_rand_free (dither_rand);
+ }
+ else
+ {
+ for (y = roi->y; y < endy; y++)
+ for (x = roi->x; x < endx; x++)
+ {
+ GimpRGB color = { 0.0, 0.0, 0.0, 1.0 };
+
+ gradient_render_pixel (x, y, &color, &rbd);
+
+ *dest++ = color.r;
+ *dest++ = color.g;
+ *dest++ = color.b;
+ *dest++ = color.a;
+ }
+ }
+ }
+
+ if (self->dither)
+ g_rand_free (rbd.seed);
+ }
+
+#ifdef USE_GRADIENT_CACHE
+ g_free (rbd.gradient_cache);
+#endif
+
+ g_object_unref (rbd.gradient);
+
+ if (rbd.dist_buffer)
+ g_object_unref (rbd.dist_buffer);
+
+ return TRUE;
+}
diff --git a/app/operations/gimpoperationblend.h b/app/operations/gimpoperationblend.h
new file mode 100644
index 0000000..1af972e
--- /dev/null
+++ b/app/operations/gimpoperationblend.h
@@ -0,0 +1,66 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationblend.h
+ * Copyright (C) 2014 Michael Henning <drawoc darkrefraction com>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_OPERATION_BLEND_H__
+#define __GIMP_OPERATION_BLEND_H__
+
+
+#include <gegl-plugin.h>
+
+
+#define GIMP_TYPE_OPERATION_BLEND (gimp_operation_blend_get_type ())
+#define GIMP_OPERATION_BLEND(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_OPERATION_BLEND,
GimpOperationBlend))
+#define GIMP_OPERATION_BLEND_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_OPERATION_BLEND,
GimpOperationBlendClass))
+#define GIMP_IS_OPERATION_BLEND(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_OPERATION_BLEND))
+#define GIMP_IS_OPERATION_BLEND_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_OPERATION_BLEND))
+#define GIMP_OPERATION_BLEND_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_OPERATION_BLEND,
GimpOperationBlendClass))
+
+
+typedef struct _GimpOperationBlend GimpOperationBlend;
+typedef struct _GimpOperationBlendClass GimpOperationBlendClass;
+
+struct _GimpOperationBlend
+{
+ GeglOperationSource parent_instance;
+
+ GimpGradient *gradient;
+ gdouble start_x, start_y, end_x, end_y;
+ GimpGradientType gradient_type;
+ GimpRepeatMode repeat;
+ gdouble offset;
+ gboolean reverse;
+
+ gboolean supersample;
+ gint max_depth;
+ gdouble threshold;
+
+ gboolean dither;
+};
+
+struct _GimpOperationBlendClass
+{
+ GeglOperationSourceClass parent_class;
+};
+
+
+GType gimp_operation_blend_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_OPERATION_BLEND_H__ */
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