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-rw-r--r--app/core/gimppickable.c378
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diff --git a/app/core/gimppickable.c b/app/core/gimppickable.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimppickable.c
+ * Copyright (C) 2004 Michael Natterer <mitch@gimp.org>
+ *
+ * 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/>.
+ */
+
+/* This file contains an interface for pixel objects that their color at
+ * a given position can be picked. Also included is a utility for
+ * sampling an average area (which uses the implemented picking
+ * functions).
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "core-types.h"
+
+#include "gimpobject.h"
+#include "gimpimage.h"
+#include "gimppickable.h"
+
+
+/* local function prototypes */
+
+static void gimp_pickable_real_get_pixel_average (GimpPickable *pickable,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer pixel);
+
+
+G_DEFINE_INTERFACE (GimpPickable, gimp_pickable, GIMP_TYPE_OBJECT)
+
+
+/* private functions */
+
+
+static void
+gimp_pickable_default_init (GimpPickableInterface *iface)
+{
+ iface->get_pixel_average = gimp_pickable_real_get_pixel_average;
+
+ g_object_interface_install_property (iface,
+ g_param_spec_object ("buffer",
+ NULL, NULL,
+ GEGL_TYPE_BUFFER,
+ GIMP_PARAM_READABLE));
+}
+
+static void
+gimp_pickable_real_get_pixel_average (GimpPickable *pickable,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer pixel)
+{
+ const Babl *average_format = babl_format ("RaGaBaA double");
+ gdouble average[4] = {};
+ gint n = 0;
+ gint x;
+ gint y;
+ gint c;
+
+ for (y = rect->y; y < rect->y + rect->height; y++)
+ {
+ for (x = rect->x; x < rect->x + rect->width; x++)
+ {
+ gdouble sample[4];
+
+ if (gimp_pickable_get_pixel_at (pickable,
+ x, y, average_format, sample))
+ {
+ for (c = 0; c < 4; c++)
+ average[c] += sample[c];
+
+ n++;
+ }
+ }
+ }
+
+ if (n > 0)
+ {
+ for (c = 0; c < 4; c++)
+ average[c] /= n;
+ }
+
+ babl_process (babl_fish (average_format, format), average, pixel, 1);
+}
+
+
+/* public functions */
+
+
+void
+gimp_pickable_flush (GimpPickable *pickable)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_if_fail (GIMP_IS_PICKABLE (pickable));
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->flush)
+ pickable_iface->flush (pickable);
+}
+
+GimpImage *
+gimp_pickable_get_image (GimpPickable *pickable)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_image)
+ return pickable_iface->get_image (pickable);
+
+ return NULL;
+}
+
+const Babl *
+gimp_pickable_get_format (GimpPickable *pickable)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_format)
+ return pickable_iface->get_format (pickable);
+
+ return NULL;
+}
+
+const Babl *
+gimp_pickable_get_format_with_alpha (GimpPickable *pickable)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_format_with_alpha)
+ return pickable_iface->get_format_with_alpha (pickable);
+
+ return NULL;
+}
+
+GeglBuffer *
+gimp_pickable_get_buffer (GimpPickable *pickable)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_buffer)
+ return pickable_iface->get_buffer (pickable);
+
+ return NULL;
+}
+
+gboolean
+gimp_pickable_get_pixel_at (GimpPickable *pickable,
+ gint x,
+ gint y,
+ const Babl *format,
+ gpointer pixel)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
+ g_return_val_if_fail (pixel != NULL, FALSE);
+
+ if (! format)
+ format = gimp_pickable_get_format (pickable);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_pixel_at)
+ return pickable_iface->get_pixel_at (pickable, x, y, format, pixel);
+
+ return FALSE;
+}
+
+void
+gimp_pickable_get_pixel_average (GimpPickable *pickable,
+ const GeglRectangle *rect,
+ const Babl *format,
+ gpointer pixel)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_if_fail (GIMP_IS_PICKABLE (pickable));
+ g_return_if_fail (rect != NULL);
+ g_return_if_fail (pixel != NULL);
+
+ if (! format)
+ format = gimp_pickable_get_format (pickable);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_pixel_average)
+ pickable_iface->get_pixel_average (pickable, rect, format, pixel);
+ else
+ memset (pixel, 0, babl_format_get_bytes_per_pixel (format));
+}
+
+gboolean
+gimp_pickable_get_color_at (GimpPickable *pickable,
+ gint x,
+ gint y,
+ GimpRGB *color)
+{
+ gdouble pixel[4];
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
+ g_return_val_if_fail (color != NULL, FALSE);
+
+ if (! gimp_pickable_get_pixel_at (pickable, x, y, NULL, pixel))
+ return FALSE;
+
+ gimp_pickable_pixel_to_srgb (pickable, NULL, pixel, color);
+
+ return TRUE;
+}
+
+gdouble
+gimp_pickable_get_opacity_at (GimpPickable *pickable,
+ gint x,
+ gint y)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), GIMP_OPACITY_TRANSPARENT);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->get_opacity_at)
+ return pickable_iface->get_opacity_at (pickable, x, y);
+
+ return GIMP_OPACITY_TRANSPARENT;
+}
+
+void
+gimp_pickable_pixel_to_srgb (GimpPickable *pickable,
+ const Babl *format,
+ gpointer pixel,
+ GimpRGB *color)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_if_fail (GIMP_IS_PICKABLE (pickable));
+ g_return_if_fail (pixel != NULL);
+ g_return_if_fail (color != NULL);
+
+ if (! format)
+ format = gimp_pickable_get_format (pickable);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->pixel_to_srgb)
+ {
+ pickable_iface->pixel_to_srgb (pickable, format, pixel, color);
+ }
+ else
+ {
+ gimp_rgba_set_pixel (color, format, pixel);
+ }
+}
+
+void
+gimp_pickable_srgb_to_pixel (GimpPickable *pickable,
+ const GimpRGB *color,
+ const Babl *format,
+ gpointer pixel)
+{
+ GimpPickableInterface *pickable_iface;
+
+ g_return_if_fail (GIMP_IS_PICKABLE (pickable));
+ g_return_if_fail (color != NULL);
+ g_return_if_fail (pixel != NULL);
+
+ if (! format)
+ format = gimp_pickable_get_format (pickable);
+
+ pickable_iface = GIMP_PICKABLE_GET_INTERFACE (pickable);
+
+ if (pickable_iface->srgb_to_pixel)
+ {
+ pickable_iface->srgb_to_pixel (pickable, color, format, pixel);
+ }
+ else
+ {
+ gimp_rgba_get_pixel (color, format, pixel);
+ }
+}
+
+void
+gimp_pickable_srgb_to_image_color (GimpPickable *pickable,
+ const GimpRGB *color,
+ GimpRGB *image_color)
+{
+ g_return_if_fail (GIMP_IS_PICKABLE (pickable));
+ g_return_if_fail (color != NULL);
+ g_return_if_fail (image_color != NULL);
+
+ gimp_pickable_srgb_to_pixel (pickable,
+ color,
+ babl_format ("R'G'B'A double"),
+ image_color);
+}
+
+gboolean
+gimp_pickable_pick_color (GimpPickable *pickable,
+ gint x,
+ gint y,
+ gboolean sample_average,
+ gdouble average_radius,
+ gpointer pixel,
+ GimpRGB *color)
+{
+ const Babl *format;
+ gdouble sample[4];
+
+ g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), FALSE);
+ g_return_val_if_fail (color != NULL, FALSE);
+
+ format = gimp_pickable_get_format (pickable);
+
+ if (! gimp_pickable_get_pixel_at (pickable, x, y, format, sample))
+ return FALSE;
+
+ if (pixel)
+ memcpy (pixel, sample, babl_format_get_bytes_per_pixel (format));
+
+ if (sample_average)
+ {
+ gint radius = floor (average_radius);
+
+ format = babl_format ("RaGaBaA double");
+
+ gimp_pickable_get_pixel_average (pickable,
+ GEGL_RECTANGLE (x - radius,
+ y - radius,
+ 2 * radius + 1,
+ 2 * radius + 1),
+ format, sample);
+ }
+
+ gimp_pickable_pixel_to_srgb (pickable, format, sample, color);
+
+ return TRUE;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-09 00:13:07 +0000