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-rw-r--r--app/operations/gimpoperationgradient.c1283
1 files changed, 1283 insertions, 0 deletions
diff --git a/app/operations/gimpoperationgradient.c b/app/operations/gimpoperationgradient.c
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+++ b/app/operations/gimpoperationgradient.c
@@ -0,0 +1,1283 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * Largely based on gimpdrawable-gradient.c
+ *
+ * gimpoperationgradient.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 <https://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/gimpgradient.h"
+
+#include "gimpoperationgradient.h"
+
+
+#define GRADIENT_CACHE_N_SUPERSAMPLES 4
+#define GRADIENT_CACHE_MAX_SIZE ((1 << 20) / sizeof (GimpRGB))
+
+
+enum
+{
+ PROP_0,
+ PROP_CONTEXT,
+ PROP_GRADIENT,
+ PROP_START_X,
+ PROP_START_Y,
+ PROP_END_X,
+ PROP_END_Y,
+ PROP_GRADIENT_TYPE,
+ PROP_GRADIENT_REPEAT,
+ PROP_OFFSET,
+ PROP_GRADIENT_REVERSE,
+ PROP_GRADIENT_BLEND_COLOR_SPACE,
+ PROP_SUPERSAMPLE,
+ PROP_SUPERSAMPLE_DEPTH,
+ PROP_SUPERSAMPLE_THRESHOLD,
+ PROP_DITHER
+};
+
+typedef struct
+{
+ GimpGradient *gradient;
+ gboolean reverse;
+ GimpGradientBlendColorSpace blend_color_space;
+ GimpRGB *gradient_cache;
+ gint gradient_cache_size;
+ GimpGradientSegment *last_seg;
+ gdouble offset;
+ gdouble sx, sy;
+ GimpGradientType gradient_type;
+ gdouble dist;
+ gdouble vec[2];
+ GimpRepeatMode repeat;
+ GeglSampler *dist_sampler;
+} RenderBlendData;
+
+
+typedef struct
+{
+ gfloat *data;
+ GeglRectangle roi;
+ GRand *dither_rand;
+} PutPixelData;
+
+
+/* local function prototypes */
+
+static void gimp_operation_gradient_dispose (GObject *gobject);
+static void gimp_operation_gradient_finalize (GObject *gobject);
+static void gimp_operation_gradient_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_gradient_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static void gimp_operation_gradient_prepare (GeglOperation *operation);
+
+static GeglRectangle gimp_operation_gradient_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 (GeglSampler *dist_sampler,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_shapeburst_spherical_factor (GeglSampler *dist_sampler,
+ gdouble offset,
+ gdouble x,
+ gdouble y);
+static gdouble gradient_calc_shapeburst_dimpled_factor (GeglSampler *dist_sampler,
+ gdouble offset,
+ 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 void gradient_dither_pixel (GimpRGB *color,
+ GRand *dither_rand,
+ gfloat *dest);
+
+static gboolean gimp_operation_gradient_process (GeglOperation *operation,
+ GeglBuffer *input,
+ GeglBuffer *output,
+ const GeglRectangle *result,
+ gint level);
+
+static void gimp_operation_gradient_invalidate_cache (GimpOperationGradient *self);
+static void gimp_operation_gradient_validate_cache (GimpOperationGradient *self);
+
+
+G_DEFINE_TYPE (GimpOperationGradient, gimp_operation_gradient,
+ GEGL_TYPE_OPERATION_FILTER)
+
+#define parent_class gimp_operation_gradient_parent_class
+
+
+static void
+gimp_operation_gradient_class_init (GimpOperationGradientClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+ GeglOperationFilterClass *filter_class = GEGL_OPERATION_FILTER_CLASS (klass);
+
+ object_class->dispose = gimp_operation_gradient_dispose;
+ object_class->finalize = gimp_operation_gradient_finalize;
+ object_class->set_property = gimp_operation_gradient_set_property;
+ object_class->get_property = gimp_operation_gradient_get_property;
+
+ operation_class->prepare = gimp_operation_gradient_prepare;
+ operation_class->get_bounding_box = gimp_operation_gradient_get_bounding_box;
+
+ filter_class->process = gimp_operation_gradient_process;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:gradient",
+ "categories", "gimp",
+ "description", "GIMP Gradient operation",
+ NULL);
+
+ g_object_class_install_property (object_class, PROP_CONTEXT,
+ g_param_spec_object ("context",
+ "Context",
+ "A GimpContext",
+ GIMP_TYPE_OBJECT,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ 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_GRADIENT_REPEAT,
+ g_param_spec_enum ("gradient-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_GRADIENT_REVERSE,
+ g_param_spec_boolean ("gradient-reverse",
+ "Reverse",
+ "Reverse the gradient",
+ FALSE,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_GRADIENT_BLEND_COLOR_SPACE,
+ g_param_spec_enum ("gradient-blend-color-space",
+ "Blend Color Space",
+ "Which color space to use when blending RGB gradient segments",
+ GIMP_TYPE_GRADIENT_BLEND_COLOR_SPACE,
+ GIMP_GRADIENT_BLEND_RGB_PERCEPTUAL,
+ 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_SUPERSAMPLE_DEPTH,
+ g_param_spec_int ("supersample-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_SUPERSAMPLE_THRESHOLD,
+ g_param_spec_double ("supersample-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_gradient_init (GimpOperationGradient *self)
+{
+ g_mutex_init (&self->gradient_cache_mutex);
+}
+
+static void
+gimp_operation_gradient_dispose (GObject *object)
+{
+ GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+ gimp_operation_gradient_invalidate_cache (self);
+
+ g_clear_object (&self->gradient);
+ g_clear_object (&self->context);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_operation_gradient_finalize (GObject *object)
+{
+ GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+ g_mutex_clear (&self->gradient_cache_mutex);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_gradient_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+ switch (property_id)
+ {
+ case PROP_CONTEXT:
+ g_value_set_object (value, self->context);
+ break;
+
+ 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_GRADIENT_REPEAT:
+ g_value_set_enum (value, self->gradient_repeat);
+ break;
+
+ case PROP_OFFSET:
+ g_value_set_double (value, self->offset);
+ break;
+
+ case PROP_GRADIENT_REVERSE:
+ g_value_set_boolean (value, self->gradient_reverse);
+ break;
+
+ case PROP_GRADIENT_BLEND_COLOR_SPACE:
+ g_value_set_enum (value, self->gradient_blend_color_space);
+ break;
+
+ case PROP_SUPERSAMPLE:
+ g_value_set_boolean (value, self->supersample);
+ break;
+
+ case PROP_SUPERSAMPLE_DEPTH:
+ g_value_set_int (value, self->supersample_depth);
+ break;
+
+ case PROP_SUPERSAMPLE_THRESHOLD:
+ g_value_set_double (value, self->supersample_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_gradient_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (object);
+
+ switch (property_id)
+ {
+ case PROP_CONTEXT:
+ if (self->context)
+ g_object_unref (self->context);
+
+ self->context = g_value_dup_object (value);
+ break;
+
+ case PROP_GRADIENT:
+ {
+ GimpGradient *gradient = g_value_get_object (value);
+
+ g_clear_object (&self->gradient);
+
+ if (gradient)
+ {
+ if (gimp_gradient_has_fg_bg_segments (gradient))
+ self->gradient = gimp_gradient_flatten (gradient, self->context);
+ else
+ self->gradient = g_object_ref (gradient);
+ }
+
+ gimp_operation_gradient_invalidate_cache (self);
+ }
+ break;
+
+ case PROP_START_X:
+ self->start_x = g_value_get_double (value);
+
+ gimp_operation_gradient_invalidate_cache (self);
+ break;
+
+ case PROP_START_Y:
+ self->start_y = g_value_get_double (value);
+
+ gimp_operation_gradient_invalidate_cache (self);
+ break;
+
+ case PROP_END_X:
+ self->end_x = g_value_get_double (value);
+
+ gimp_operation_gradient_invalidate_cache (self);
+ break;
+
+ case PROP_END_Y:
+ self->end_y = g_value_get_double (value);
+
+ gimp_operation_gradient_invalidate_cache (self);
+ break;
+
+ case PROP_GRADIENT_TYPE:
+ self->gradient_type = g_value_get_enum (value);
+ break;
+
+ case PROP_GRADIENT_REPEAT:
+ self->gradient_repeat = g_value_get_enum (value);
+ break;
+
+ case PROP_OFFSET:
+ self->offset = g_value_get_double (value);
+ break;
+
+ case PROP_GRADIENT_REVERSE:
+ self->gradient_reverse = g_value_get_boolean (value);
+
+ gimp_operation_gradient_invalidate_cache (self);
+ break;
+
+ case PROP_GRADIENT_BLEND_COLOR_SPACE:
+ self->gradient_blend_color_space = g_value_get_enum (value);
+
+ gimp_operation_gradient_invalidate_cache (self);
+ break;
+
+ case PROP_SUPERSAMPLE:
+ self->supersample = g_value_get_boolean (value);
+ break;
+
+ case PROP_SUPERSAMPLE_DEPTH:
+ self->supersample_depth = g_value_get_int (value);
+ break;
+
+ case PROP_SUPERSAMPLE_THRESHOLD:
+ self->supersample_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_gradient_prepare (GeglOperation *operation)
+{
+ gegl_operation_set_format (operation, "output", babl_format ("R'G'B'A float"));
+}
+
+static GeglRectangle
+gimp_operation_gradient_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 (fabs (x), fabs (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;
+
+ offset = offset / 100.0;
+
+ 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 (GeglSampler *dist_sampler,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ gfloat value;
+
+ offset = offset / 100.0;
+
+ gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
+
+ value = 1.0 - value;
+
+ if (value < offset)
+ value = 0.0;
+ else if (offset == 1.0)
+ value = (value >= 1.0) ? 1.0 : 0.0;
+ else
+ value = (value - offset) / (1.0 - offset);
+
+ return value;
+}
+
+
+static gdouble
+gradient_calc_shapeburst_spherical_factor (GeglSampler *dist_sampler,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ gfloat value;
+
+ offset = 1.0 - offset / 100.0;
+
+ gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
+
+ if (value > offset)
+ value = 1.0;
+ else if (offset == 0.0)
+ value = (value <= 0.0) ? 0.0 : 1.0;
+ else
+ value = value / offset;
+
+ value = 1.0 - sin (0.5 * G_PI * value);
+
+ return value;
+}
+
+
+static gdouble
+gradient_calc_shapeburst_dimpled_factor (GeglSampler *dist_sampler,
+ gdouble offset,
+ gdouble x,
+ gdouble y)
+{
+ gfloat value;
+
+ offset = 1.0 - offset / 100.0;
+
+ gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
+
+ if (value > offset)
+ value = 1.0;
+ else if (offset == 0.0)
+ value = (value <= 0.0) ? 0.0 : 1.0;
+ else
+ value = value / offset;
+
+ 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;
+
+ /* we want to calculate the color at the pixel's center */
+ x += 0.5;
+ y += 0.5;
+
+ /* 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_sampler,
+ rbd->offset,
+ x, y);
+ break;
+
+ case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
+ factor = gradient_calc_shapeburst_spherical_factor (rbd->dist_sampler,
+ rbd->offset,
+ x, y);
+ break;
+
+ case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
+ factor = gradient_calc_shapeburst_dimpled_factor (rbd->dist_sampler,
+ rbd->offset,
+ 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_NONE:
+ 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;
+
+ case GIMP_REPEAT_TRUNCATE:
+ if (factor < 0.0 || factor > 1.0)
+ {
+ gimp_rgba_set (color, 0.0, 0.0, 0.0, 0.0);
+ return;
+ }
+ break;
+ }
+
+ /* Blend the colors */
+
+ if (rbd->gradient_cache)
+ {
+ factor = CLAMP (factor, 0.0, 1.0);
+
+ *color =
+ rbd->gradient_cache[ROUND (factor * (rbd->gradient_cache_size - 1))];
+ }
+ else
+ {
+ rbd->last_seg = gimp_gradient_get_color_at (rbd->gradient, NULL,
+ rbd->last_seg, factor,
+ rbd->reverse,
+ rbd->blend_color_space,
+ color);
+ }
+}
+
+static void
+gradient_put_pixel (gint x,
+ gint y,
+ GimpRGB *color,
+ gpointer put_pixel_data)
+{
+ PutPixelData *ppd = put_pixel_data;
+ const gint index = (y - ppd->roi.y) * ppd->roi.width + (x - ppd->roi.x);
+ gfloat *dest = ppd->data + 4 * index;
+
+ if (ppd->dither_rand)
+ {
+ gradient_dither_pixel (color, ppd->dither_rand, dest);
+
+ dest += 4;
+ }
+ else
+ {
+ *dest++ = color->r;
+ *dest++ = color->g;
+ *dest++ = color->b;
+ *dest++ = color->a;
+ }
+}
+
+static void
+gradient_dither_pixel (GimpRGB *color,
+ GRand *dither_rand,
+ gfloat *dest)
+{
+ gfloat r, g, b, a;
+ guint i;
+
+ i = g_rand_int (dither_rand);
+
+ r = color->r + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0; i >>= 8;
+ g = color->g + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0; i >>= 8;
+ b = color->b + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0; i >>= 8;
+
+ if (color->a > 0.0 && color->a < 1.0)
+ a = color->a + (gdouble) (i & 0xff) / 256.0 / 256.0 - 0.5 / 256.0;
+ else
+ a = color->a;
+
+ *dest++ = CLAMP (r, 0.0, 1.0);
+ *dest++ = CLAMP (g, 0.0, 1.0);
+ *dest++ = CLAMP (b, 0.0, 1.0);
+ *dest++ = CLAMP (a, 0.0, 1.0);
+}
+
+static gboolean
+gimp_operation_gradient_process (GeglOperation *operation,
+ GeglBuffer *input,
+ GeglBuffer *output,
+ const GeglRectangle *result,
+ gint level)
+{
+ GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (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, };
+
+ GeglBufferIterator *iter;
+ GeglRectangle *roi;
+ GRand *dither_rand = NULL;
+
+ if (! self->gradient)
+ return TRUE;
+
+ gimp_operation_gradient_validate_cache (self);
+
+ rbd.gradient = self->gradient;
+ rbd.reverse = self->gradient_reverse;
+ rbd.blend_color_space = self->gradient_blend_color_space;
+ rbd.gradient_cache = self->gradient_cache;
+ rbd.gradient_cache_size = self->gradient_cache_size;
+
+ /* 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_sampler = gegl_buffer_sampler_new_at_level (
+ input, babl_format ("Y float"), GEGL_SAMPLER_NEAREST, level);
+ 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->gradient_repeat;
+
+ /* Render the gradient! */
+
+ iter = gegl_buffer_iterator_new (output, result, 0,
+ babl_format ("R'G'B'A float"),
+ GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
+ roi = &iter->items[0].roi;
+
+ if (self->dither)
+ dither_rand = g_rand_new ();
+
+ if (self->supersample)
+ {
+ PutPixelData ppd;
+
+ ppd.dither_rand = dither_rand;
+
+ while (gegl_buffer_iterator_next (iter))
+ {
+ ppd.data = iter->items[0].data;
+ ppd.roi = *roi;
+
+ gimp_adaptive_supersample_area (roi->x, roi->y,
+ roi->x + roi->width - 1,
+ roi->y + roi->height - 1,
+ self->supersample_depth,
+ self->supersample_threshold,
+ gradient_render_pixel, &rbd,
+ gradient_put_pixel, &ppd,
+ NULL,
+ NULL);
+ }
+ }
+ else
+ {
+ while (gegl_buffer_iterator_next (iter))
+ {
+ gfloat *dest = iter->items[0].data;
+ gint endx = roi->x + roi->width;
+ gint endy = roi->y + roi->height;
+ gint x, y;
+
+ if (dither_rand)
+ {
+ 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);
+ gradient_dither_pixel (&color, dither_rand, dest);
+
+ dest += 4;
+ }
+ }
+ 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 (dither_rand);
+
+ g_clear_object (&rbd.dist_sampler);
+
+ return TRUE;
+}
+
+static void
+gimp_operation_gradient_invalidate_cache (GimpOperationGradient *self)
+{
+ g_clear_pointer (&self->gradient_cache, g_free);
+}
+
+static void
+gimp_operation_gradient_validate_cache (GimpOperationGradient *self)
+{
+ GimpGradientSegment *last_seg = NULL;
+ gint cache_size;
+ gint i;
+
+ if (! self->gradient)
+ return;
+
+ g_mutex_lock (&self->gradient_cache_mutex);
+
+ if (self->gradient_cache)
+ {
+ g_mutex_unlock (&self->gradient_cache_mutex);
+
+ return;
+ }
+
+ cache_size = ceil (hypot (self->start_x - self->end_x,
+ self->start_y - self->end_y)) *
+ GRADIENT_CACHE_N_SUPERSAMPLES;
+
+ /* have at least two values in the cache */
+ cache_size = MAX (cache_size, 2);
+
+ /* don't use a cache if its necessary size is too big */
+ if (cache_size > GRADIENT_CACHE_MAX_SIZE)
+ {
+ g_mutex_unlock (&self->gradient_cache_mutex);
+
+ return;
+ }
+
+ self->gradient_cache = g_new0 (GimpRGB, cache_size);
+ self->gradient_cache_size = cache_size;
+
+ for (i = 0; i < self->gradient_cache_size; i++)
+ {
+ gdouble factor = (gdouble) i / (gdouble) (self->gradient_cache_size - 1);
+
+ last_seg = gimp_gradient_get_color_at (self->gradient, NULL, last_seg,
+ factor,
+ self->gradient_reverse,
+ self->gradient_blend_color_space,
+ self->gradient_cache + i);
+ }
+
+ g_mutex_unlock (&self->gradient_cache_mutex);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 15:18:37 +0000