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-rw-r--r--app/paint/gimppaintbrush.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/app/paint/gimppaintbrush.c b/app/paint/gimppaintbrush.c
new file mode 100644
index 0000000..2afd13c
--- /dev/null
+++ b/app/paint/gimppaintbrush.c
@@ -0,0 +1,395 @@
+/* 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 "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+#include "libgimpbase/gimpbase.h"
+
+#include "paint-types.h"
+
+#include "gegl/gimp-gegl-utils.h"
+
+#include "core/gimp.h"
+#include "core/gimp-palettes.h"
+#include "core/gimpbrush.h"
+#include "core/gimpdrawable.h"
+#include "core/gimpdynamics.h"
+#include "core/gimpgradient.h"
+#include "core/gimpimage.h"
+#include "core/gimppickable.h"
+#include "core/gimpsymmetry.h"
+#include "core/gimptempbuf.h"
+
+#include "gimppaintbrush.h"
+#include "gimppaintoptions.h"
+
+#include "gimp-intl.h"
+
+
+static void gimp_paintbrush_paint (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ GimpPaintState paint_state,
+ guint32 time);
+
+static gboolean gimp_paintbrush_real_get_color_history_color (GimpPaintbrush *paintbrush,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpRGB *color);
+static void gimp_paintbrush_real_get_paint_params (GimpPaintbrush *paintbrush,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ gdouble grad_point,
+ GimpLayerMode *paint_mode,
+ GimpPaintApplicationMode *paint_appl_mode,
+ const GimpTempBuf **paint_pixmap,
+ GimpRGB *paint_color);
+
+
+G_DEFINE_TYPE (GimpPaintbrush, gimp_paintbrush, GIMP_TYPE_BRUSH_CORE)
+
+
+void
+gimp_paintbrush_register (Gimp *gimp,
+ GimpPaintRegisterCallback callback)
+{
+ (* callback) (gimp,
+ GIMP_TYPE_PAINTBRUSH,
+ GIMP_TYPE_PAINT_OPTIONS,
+ "gimp-paintbrush",
+ _("Paintbrush"),
+ "gimp-tool-paintbrush");
+}
+
+static void
+gimp_paintbrush_class_init (GimpPaintbrushClass *klass)
+{
+ GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
+ GimpBrushCoreClass *brush_core_class = GIMP_BRUSH_CORE_CLASS (klass);
+
+ paint_core_class->paint = gimp_paintbrush_paint;
+
+ brush_core_class->handles_changing_brush = TRUE;
+
+ klass->get_color_history_color = gimp_paintbrush_real_get_color_history_color;
+ klass->get_paint_params = gimp_paintbrush_real_get_paint_params;
+}
+
+static void
+gimp_paintbrush_init (GimpPaintbrush *paintbrush)
+{
+}
+
+static void
+gimp_paintbrush_paint (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ GimpPaintState paint_state,
+ guint32 time)
+{
+ GimpPaintbrush *paintbrush = GIMP_PAINTBRUSH (paint_core);
+
+ switch (paint_state)
+ {
+ case GIMP_PAINT_STATE_INIT:
+ {
+ GimpRGB color;
+
+ if (GIMP_PAINTBRUSH_GET_CLASS (paintbrush)->get_color_history_color &&
+ GIMP_PAINTBRUSH_GET_CLASS (paintbrush)->get_color_history_color (
+ paintbrush, drawable, paint_options, &color))
+ {
+ GimpContext *context = GIMP_CONTEXT (paint_options);
+
+ gimp_palettes_add_color_history (context->gimp, &color);
+ }
+ }
+ break;
+
+ case GIMP_PAINT_STATE_MOTION:
+ _gimp_paintbrush_motion (paint_core, drawable, paint_options,
+ sym, GIMP_OPACITY_OPAQUE);
+ break;
+
+ case GIMP_PAINT_STATE_FINISH:
+ {
+ if (paintbrush->paint_buffer)
+ {
+ g_object_remove_weak_pointer (
+ G_OBJECT (paintbrush->paint_buffer),
+ (gpointer) &paintbrush->paint_buffer);
+
+ paintbrush->paint_buffer = NULL;
+ }
+
+ g_clear_pointer (&paintbrush->paint_pixmap, gimp_temp_buf_unref);
+ }
+ break;
+ }
+}
+
+static gboolean
+gimp_paintbrush_real_get_color_history_color (GimpPaintbrush *paintbrush,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpRGB *color)
+{
+ GimpContext *context = GIMP_CONTEXT (paint_options);
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paintbrush);
+ GimpDynamics *dynamics = gimp_context_get_dynamics (context);
+
+ /* We don't save gradient color history and pixmap brushes
+ * have no color to save.
+ */
+ if (gimp_dynamics_is_output_enabled (dynamics, GIMP_DYNAMICS_OUTPUT_COLOR) ||
+ (brush_core->brush && gimp_brush_get_pixmap (brush_core->brush)))
+ {
+ return FALSE;
+ }
+
+ gimp_context_get_foreground (context, color);
+
+ return TRUE;
+}
+
+static void
+gimp_paintbrush_real_get_paint_params (GimpPaintbrush *paintbrush,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ gdouble grad_point,
+ GimpLayerMode *paint_mode,
+ GimpPaintApplicationMode *paint_appl_mode,
+ const GimpTempBuf **paint_pixmap,
+ GimpRGB *paint_color)
+{
+ GimpPaintCore *paint_core = GIMP_PAINT_CORE (paintbrush);
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paintbrush);
+ GimpContext *context = GIMP_CONTEXT (paint_options);
+ GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
+
+ *paint_mode = gimp_context_get_paint_mode (context);
+
+ if (gimp_paint_options_get_gradient_color (paint_options, image,
+ grad_point,
+ paint_core->pixel_dist,
+ paint_color))
+ {
+ /* optionally take the color from the current gradient */
+ gimp_pickable_srgb_to_image_color (GIMP_PICKABLE (drawable),
+ paint_color, paint_color);
+
+ *paint_appl_mode = GIMP_PAINT_INCREMENTAL;
+ }
+ else if (brush_core->brush && gimp_brush_get_pixmap (brush_core->brush))
+ {
+ /* otherwise check if the brush has a pixmap and use that to
+ * color the area
+ */
+ *paint_pixmap = gimp_brush_core_get_brush_pixmap (brush_core);
+
+ *paint_appl_mode = GIMP_PAINT_INCREMENTAL;
+ }
+ else
+ {
+ /* otherwise fill the area with the foreground color */
+ gimp_context_get_foreground (context, paint_color);
+
+ gimp_pickable_srgb_to_image_color (GIMP_PICKABLE (drawable),
+ paint_color, paint_color);
+ }
+}
+
+void
+_gimp_paintbrush_motion (GimpPaintCore *paint_core,
+ GimpDrawable *drawable,
+ GimpPaintOptions *paint_options,
+ GimpSymmetry *sym,
+ gdouble opacity)
+{
+ GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
+ GimpPaintbrush *paintbrush = GIMP_PAINTBRUSH (paint_core);
+ GimpContext *context = GIMP_CONTEXT (paint_options);
+ GimpDynamics *dynamics = brush_core->dynamics;
+ GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
+ gdouble fade_point;
+ gdouble grad_point;
+ gdouble force;
+ const GimpCoords *coords;
+ 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);
+ /* Some settings are based on the original stroke. */
+ opacity *= gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_OPACITY,
+ coords,
+ paint_options,
+ fade_point);
+ if (opacity == 0.0)
+ return;
+
+ if (GIMP_BRUSH_CORE_GET_CLASS (brush_core)->handles_transforming_brush)
+ {
+ gimp_brush_core_eval_transform_dynamics (brush_core,
+ drawable,
+ paint_options,
+ coords);
+ }
+
+ grad_point = gimp_dynamics_get_linear_value (dynamics,
+ GIMP_DYNAMICS_OUTPUT_COLOR,
+ coords,
+ paint_options,
+ fade_point);
+
+ n_strokes = gimp_symmetry_get_size (sym);
+ for (i = 0; i < n_strokes; i++)
+ {
+ GimpLayerMode paint_mode;
+ GimpPaintApplicationMode paint_appl_mode;
+ GeglBuffer *paint_buffer;
+ gint paint_buffer_x;
+ gint paint_buffer_y;
+ const GimpTempBuf *paint_pixmap = NULL;
+ GimpRGB paint_color;
+ gint paint_width, paint_height;
+
+ paint_appl_mode = paint_options->application_mode;
+
+ GIMP_PAINTBRUSH_GET_CLASS (paintbrush)->get_paint_params (paintbrush,
+ drawable,
+ paint_options,
+ sym,
+ grad_point,
+ &paint_mode,
+ &paint_appl_mode,
+ &paint_pixmap,
+ &paint_color);
+
+ coords = gimp_symmetry_get_coords (sym, i);
+
+ if (GIMP_BRUSH_CORE_GET_CLASS (brush_core)->handles_transforming_brush)
+ gimp_brush_core_eval_transform_symmetry (brush_core, sym, i);
+
+ paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
+ paint_options,
+ paint_mode,
+ coords,
+ &paint_buffer_x,
+ &paint_buffer_y,
+ &paint_width,
+ &paint_height);
+ if (! paint_buffer)
+ continue;
+
+ if (! paint_pixmap)
+ {
+ opacity *= paint_color.a;
+ gimp_rgb_set_alpha (&paint_color, GIMP_OPACITY_OPAQUE);
+ }
+
+ /* fill the paint buffer. we can skip this step when reusing the
+ * previous paint buffer, if the paint color/pixmap hasn't changed
+ * (unless using an applicator, which currently modifies the paint buffer
+ * in-place).
+ */
+ if (paint_core->applicator ||
+ paint_buffer != paintbrush->paint_buffer ||
+ paint_pixmap != paintbrush->paint_pixmap ||
+ (! paint_pixmap && (gimp_rgba_distance (&paint_color,
+ &paintbrush->paint_color))))
+ {
+ if (paint_buffer != paintbrush->paint_buffer)
+ {
+ if (paintbrush->paint_buffer)
+ {
+ g_object_remove_weak_pointer (
+ G_OBJECT (paintbrush->paint_buffer),
+ (gpointer) &paintbrush->paint_buffer);
+ }
+
+ paintbrush->paint_buffer = paint_buffer;
+
+ g_object_add_weak_pointer (
+ G_OBJECT (paintbrush->paint_buffer),
+ (gpointer) &paintbrush->paint_buffer);
+ }
+
+ if (paint_pixmap != paintbrush->paint_pixmap)
+ {
+ g_clear_pointer (&paintbrush->paint_pixmap, gimp_temp_buf_unref);
+
+ if (paint_pixmap)
+ paintbrush->paint_pixmap = gimp_temp_buf_ref (paint_pixmap);
+ }
+
+ paintbrush->paint_color = paint_color;
+
+ if (paint_pixmap)
+ {
+ gimp_brush_core_color_area_with_pixmap (brush_core, drawable,
+ coords,
+ paint_buffer,
+ paint_buffer_x,
+ paint_buffer_y,
+ FALSE);
+ }
+ else
+ {
+ GeglColor *color;
+
+ color = gimp_gegl_color_new (&paint_color);
+
+ gegl_buffer_set_color (paint_buffer, NULL, color);
+
+ g_object_unref (color);
+ }
+ }
+
+ 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;
+
+ /* finally, let the brush core paste the colored area on the canvas */
+ gimp_brush_core_paste_canvas (brush_core, drawable,
+ coords,
+ MIN (opacity, GIMP_OPACITY_OPAQUE),
+ gimp_context_get_opacity (context),
+ paint_mode,
+ gimp_paint_options_get_brush_mode (paint_options),
+ force,
+ paint_appl_mode);
+ }
+}
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