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-rw-r--r--app/paint/gimpsmudge.c575
1 files changed, 575 insertions, 0 deletions
diff --git a/app/paint/gimpsmudge.c b/app/paint/gimpsmudge.c
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+++ b/app/paint/gimpsmudge.c
@@ -0,0 +1,575 @@
+/* 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 "libgimpmath/gimpmath.h"
+
+#include "paint-types.h"
+
+#include "gegl/gimp-gegl-loops.h"
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimp-palettes.h"
+#include "core/gimpbrush.h"
+#include "core/gimpbrush-header.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 "gimpsmudge.h"
+#include "gimpsmudgeoptions.h"
+
+#include "gimp-intl.h"
+
+
+static void gimp_smudge_finalize (GObject *object);
+
+static void gimp_smudge_paint (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ GimpPaintState paint_state,
+ guint32 time);
+static gboolean gimp_smudge_start (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym);
+static void gimp_smudge_motion (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym);
+
+static void gimp_smudge_accumulator_coords (GimpPaintCore *paint_core,
+ const GimpCoords *coords,
+ gint stroke,
+ gint *x,
+ gint *y);
+
+static void gimp_smudge_accumulator_size (GimpPaintOptions *paint_options,
+ const GimpCoords *coords,
+ gint *accumulator_size);
+
+
+G_DEFINE_TYPE (GimpSmudge, gimp_smudge, GIMP_TYPE_BRUSH_CORE)
+
+#define parent_class gimp_smudge_parent_class
+
+
+void
+gimp_smudge_register (Gimp *gimp,
+ GimpPaintRegisterCallback callback)
+{
+ (* callback) (gimp,
+ GIMP_TYPE_SMUDGE,
+ GIMP_TYPE_SMUDGE_OPTIONS,
+ "gimp-smudge",
+ _("Smudge"),
+ "gimp-tool-smudge");
+}
+
+static void
+gimp_smudge_class_init (GimpSmudgeClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
+ GimpBrushCoreClass *brush_core_class = GIMP_BRUSH_CORE_CLASS (klass);
+
+ object_class->finalize = gimp_smudge_finalize;
+
+ paint_core_class->paint = gimp_smudge_paint;
+
+ brush_core_class->handles_changing_brush = TRUE;
+ brush_core_class->handles_transforming_brush = TRUE;
+ brush_core_class->handles_dynamic_transforming_brush = TRUE;
+}
+
+static void
+gimp_smudge_init (GimpSmudge *smudge)
+{
+}
+
+static void
+gimp_smudge_finalize (GObject *object)
+{
+ GimpSmudge *smudge = GIMP_SMUDGE (object);
+
+ if (smudge->accum_buffers)
+ {
+ GList *iter;
+
+ for (iter = smudge->accum_buffers; iter; iter = g_list_next (iter))
+ {
+ if (iter->data)
+ g_object_unref (iter->data);
+ }
+
+ g_list_free (smudge->accum_buffers);
+ smudge->accum_buffers = NULL;
+ }
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_smudge_paint (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ GimpPaintState paint_state,
+ guint32 time)
+{
+ GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
+
+ switch (paint_state)
+ {
+ case GIMP_PAINT_STATE_INIT:
+ {
+ GimpContext *context = GIMP_CONTEXT (paint_options);
+ GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
+ GimpDynamics *dynamics = gimp_context_get_dynamics (context);
+
+ /* Don't add to color history when
+ * 1. pure smudging (flow=0)
+ * 2. color is from gradient or pixmap brushes
+ */
+ if (options->flow > 0.0 &&
+ ! gimp_dynamics_is_output_enabled (dynamics, GIMP_DYNAMICS_OUTPUT_COLOR) &&
+ ! (brush_core->brush && gimp_brush_get_pixmap (brush_core->brush)))
+ {
+ GimpRGB foreground;
+
+ gimp_context_get_foreground (context, &foreground);
+ gimp_palettes_add_color_history (context->gimp, &foreground);
+ }
+ }
+ break;
+
+ case GIMP_PAINT_STATE_MOTION:
+ /* initialization fails if the user starts outside the drawable */
+ if (! smudge->initialized)
+ smudge->initialized = gimp_smudge_start (paint_core, drawable,
+ paint_options, sym);
+
+ if (smudge->initialized)
+ gimp_smudge_motion (paint_core, drawable, paint_options, sym);
+ break;
+
+ case GIMP_PAINT_STATE_FINISH:
+ if (smudge->accum_buffers)
+ {
+ GList *iter;
+
+ for (iter = smudge->accum_buffers; iter; iter = g_list_next (iter))
+ {
+ if (iter->data)
+ g_object_unref (iter->data);
+ }
+
+ g_list_free (smudge->accum_buffers);
+ smudge->accum_buffers = NULL;
+ }
+
+ smudge->initialized = FALSE;
+ break;
+
+ default:
+ break;
+ }
+}
+
+static gboolean
+gimp_smudge_start (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym)
+{
+ GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
+ GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
+ GimpPickable *dest_pickable;
+ GeglBuffer *pickable_buffer;
+ GeglBuffer *paint_buffer;
+ GimpCoords *coords;
+ gint dest_pickable_off_x;
+ gint dest_pickable_off_y;
+ gint paint_buffer_x;
+ gint paint_buffer_y;
+ gint accum_size;
+ gint n_strokes;
+ gint i;
+ gint x, y;
+
+ coords = gimp_symmetry_get_origin (sym);
+ gimp_brush_core_eval_transform_dynamics (brush_core,
+ drawable,
+ paint_options,
+ coords);
+
+ if (options->sample_merged)
+ {
+ dest_pickable = gimp_paint_core_get_image_pickable (paint_core);
+
+ gimp_item_get_offset (GIMP_ITEM (drawable),
+ &dest_pickable_off_x,
+ &dest_pickable_off_y);
+ }
+ else
+ {
+ dest_pickable = GIMP_PICKABLE (drawable);
+
+ dest_pickable_off_x = 0;
+ dest_pickable_off_y = 0;
+ }
+
+ pickable_buffer = gimp_pickable_get_buffer (dest_pickable);
+
+ n_strokes = gimp_symmetry_get_size (sym);
+ for (i = 0; i < n_strokes; i++)
+ {
+ GeglBuffer *accum_buffer;
+
+ coords = gimp_symmetry_get_coords (sym, i);
+
+ gimp_smudge_accumulator_size (paint_options, coords, &accum_size);
+
+ /* Allocate the accumulation buffer */
+ accum_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
+ accum_size,
+ accum_size),
+ babl_format ("RGBA float"));
+ smudge->accum_buffers = g_list_prepend (smudge->accum_buffers,
+ accum_buffer);
+
+ /* adjust the x and y coordinates to the upper left corner of the
+ * accumulator
+ */
+ paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
+ paint_options,
+ GIMP_LAYER_MODE_NORMAL,
+ coords,
+ &paint_buffer_x,
+ &paint_buffer_y,
+ NULL, NULL);
+ if (! paint_buffer)
+ continue;
+
+ gimp_smudge_accumulator_coords (paint_core, coords, 0, &x, &y);
+
+ /* If clipped, prefill the smudge buffer with the color at the
+ * brush position.
+ */
+ if (x != paint_buffer_x ||
+ y != paint_buffer_y ||
+ accum_size != gegl_buffer_get_width (paint_buffer) ||
+ accum_size != gegl_buffer_get_height (paint_buffer))
+ {
+ gfloat pixel[4];
+ GeglColor *color;
+ gint pick_x;
+ gint pick_y;
+
+ pick_x = CLAMP ((gint) coords->x + dest_pickable_off_x,
+ 0,
+ gegl_buffer_get_width (pickable_buffer) - 1);
+ pick_y = CLAMP ((gint) coords->y + dest_pickable_off_y,
+ 0,
+ gegl_buffer_get_height (pickable_buffer) - 1);
+
+ gimp_pickable_get_pixel_at (dest_pickable,
+ pick_x, pick_y,
+ babl_format ("RGBA float"),
+ pixel);
+
+ color = gegl_color_new (NULL);
+ gegl_color_set_pixel (color, babl_format ("RGBA float"), pixel);
+ gegl_buffer_set_color (accum_buffer, NULL, color);
+ g_object_unref (color);
+ }
+
+ /* copy the region under the original painthit. */
+ gimp_gegl_buffer_copy
+ (pickable_buffer,
+ GEGL_RECTANGLE (paint_buffer_x + dest_pickable_off_x,
+ paint_buffer_y + dest_pickable_off_y,
+ gegl_buffer_get_width (paint_buffer),
+ gegl_buffer_get_height (paint_buffer)),
+ GEGL_ABYSS_NONE,
+ accum_buffer,
+ GEGL_RECTANGLE (paint_buffer_x - x,
+ paint_buffer_y - y,
+ 0, 0));
+ }
+
+ smudge->accum_buffers = g_list_reverse (smudge->accum_buffers);
+
+ return TRUE;
+}
+
+static void
+gimp_smudge_motion (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym)
+{
+ GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
+ GimpSmudgeOptions *options = GIMP_SMUDGE_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));
+ GimpPickable *dest_pickable;
+ GeglBuffer *paint_buffer;
+ gint dest_pickable_off_x;
+ gint dest_pickable_off_y;
+ gint paint_buffer_x;
+ gint paint_buffer_y;
+ gint paint_buffer_width;
+ gint paint_buffer_height;
+ /* brush dynamics */
+ gdouble fade_point;
+ gdouble opacity;
+ gdouble rate;
+ gdouble flow;
+ gdouble grad_point;
+ /* brush color */
+ GimpRGB brush_color;
+ GimpRGB *brush_color_ptr; /* whether use single color or pixmap */
+ /* accum buffer */
+ gint x, y;
+ GeglBuffer *accum_buffer;
+ /* other variables */
+ gdouble force;
+ GimpCoords *coords;
+ gint paint_width, paint_height;
+ gint n_strokes;
+ gint i;
+
+ if (options->sample_merged)
+ {
+ dest_pickable = gimp_paint_core_get_image_pickable (paint_core);
+
+ gimp_item_get_offset (GIMP_ITEM (drawable),
+ &dest_pickable_off_x,
+ &dest_pickable_off_y);
+ }
+ else
+ {
+ dest_pickable = GIMP_PICKABLE (drawable);
+
+ dest_pickable_off_x = 0;
+ dest_pickable_off_y = 0;
+ }
+
+ 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 (brush_core,
+ drawable,
+ paint_options,
+ coords);
+
+ /* Get brush dynamic values other than opacity */
+ rate = ((options->rate / 100.0) *
+ gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_RATE,
+ coords,
+ paint_options,
+ fade_point));
+
+ flow = ((options->flow / 100.0) *
+ gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_FLOW,
+ coords,
+ paint_options,
+ fade_point));
+
+ grad_point = gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_COLOR,
+ coords,
+ paint_options,
+ fade_point);
+
+ /* Get current gradient color, brush pixmap, or foreground color */
+ brush_color_ptr = &brush_color;
+ if (gimp_paint_options_get_gradient_color (paint_options, image,
+ grad_point,
+ paint_core->pixel_dist,
+ &brush_color))
+ {
+ /* No more processing needed */
+ }
+ else if (brush_core->brush && gimp_brush_get_pixmap (brush_core->brush))
+ {
+ brush_color_ptr = NULL;
+ }
+ else
+ {
+ gimp_context_get_foreground (context, &brush_color);
+ }
+
+ /* Convert to linear RGBA */
+ if (brush_color_ptr)
+ gimp_pickable_srgb_to_pixel (dest_pickable,
+ &brush_color,
+ babl_format ("RGBA double"),
+ &brush_color);
+
+ 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;
+
+ paint_buffer_width = gegl_buffer_get_width (paint_buffer);
+ paint_buffer_height = gegl_buffer_get_height (paint_buffer);
+
+ /* Get the unclipped acumulator coordinates */
+ gimp_smudge_accumulator_coords (paint_core, coords, i, &x, &y);
+
+ accum_buffer = g_list_nth_data (smudge->accum_buffers, i);
+
+ /* Old smudge tool:
+ * Smudge uses the buffer Accum.
+ * For each successive painthit Accum is built like this
+ * Accum = rate*Accum + (1-rate)*I.
+ * where I is the pixels under the current painthit.
+ * Then the paint area (paint_area) is built as
+ * (Accum,1) (if no alpha),
+ */
+
+ /* 2017/4/22: New smudge painting tool:
+ * Accum=rate*Accum + (1-rate)*I
+ * if brush_color_ptr!=NULL
+ * Paint=(1-flow)*Accum + flow*BrushColor
+ * else, draw brush pixmap on the paint_buffer and
+ * Paint=(1-flow)*Accum + flow*Paint
+ *
+ * For non-pixmap brushes, calculate blending in
+ * gimp_gegl_smudge_with_paint() instead of calling
+ * gegl_buffer_set_color() to reduce gegl's internal processing.
+ */
+ if (! brush_color_ptr && flow > 0.0)
+ {
+ gimp_brush_core_color_area_with_pixmap (brush_core, drawable,
+ coords,
+ paint_buffer,
+ paint_buffer_x,
+ paint_buffer_y,
+ TRUE);
+ }
+
+ gimp_gegl_smudge_with_paint (accum_buffer,
+ GEGL_RECTANGLE (paint_buffer_x - x,
+ paint_buffer_y - y,
+ paint_buffer_width,
+ paint_buffer_height),
+ gimp_pickable_get_buffer (dest_pickable),
+ GEGL_RECTANGLE (paint_buffer_x +
+ dest_pickable_off_x,
+ paint_buffer_y +
+ dest_pickable_off_y,
+ paint_buffer_width,
+ paint_buffer_height),
+ brush_color_ptr,
+ paint_buffer,
+ options->no_erasing,
+ flow,
+ rate);
+
+ if (gimp_dynamics_is_output_enabled (dynamics, GIMP_DYNAMICS_OUTPUT_FORCE))
+ force = gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_FORCE,
+ coords,
+ paint_options,
+ fade_point);
+ else
+ force = paint_options->brush_force;
+
+ gimp_brush_core_replace_canvas (GIMP_BRUSH_CORE (paint_core), drawable,
+ coords,
+ MIN (opacity, GIMP_OPACITY_OPAQUE),
+ gimp_context_get_opacity (context),
+ gimp_paint_options_get_brush_mode (paint_options),
+ force,
+ GIMP_PAINT_INCREMENTAL);
+ }
+}
+
+static void
+gimp_smudge_accumulator_coords (GimpPaintCore *paint_core,
+ const GimpCoords *coords,
+ gint stroke,
+ gint *x,
+ gint *y)
+{
+ GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
+ GeglBuffer *accum_buffer;
+
+ accum_buffer = g_list_nth_data (smudge->accum_buffers, stroke);
+
+ *x = (gint) coords->x - gegl_buffer_get_width (accum_buffer) / 2;
+ *y = (gint) coords->y - gegl_buffer_get_height (accum_buffer) / 2;
+}
+
+static void
+gimp_smudge_accumulator_size (GimpPaintOptions *paint_options,
+ const GimpCoords *coords,
+ gint *accumulator_size)
+{
+ gdouble max_view_scale = 1.0;
+ gdouble max_brush_size;
+
+ if (paint_options->brush_lock_to_view)
+ max_view_scale = MAX (coords->xscale, coords->yscale);
+
+ max_brush_size = MIN (paint_options->brush_size / max_view_scale,
+ GIMP_BRUSH_MAX_SIZE);
+
+ /* Note: the max brush mask size plus a border of 1 pixel and a
+ * little headroom
+ */
+ *accumulator_size = ceil (sqrt (2 * SQR (max_brush_size + 1)) + 2);
+}
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