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-rw-r--r--app/core/gimpdrawable-histogram.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/app/core/gimpdrawable-histogram.c b/app/core/gimpdrawable-histogram.c
new file mode 100644
index 0000000..b0be3f5
--- /dev/null
+++ b/app/core/gimpdrawable-histogram.c
@@ -0,0 +1,258 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimphistogram module Copyright (C) 1999 Jay Cox <jaycox@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/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "core-types.h"
+
+#include "gegl/gimp-gegl-nodes.h"
+#include "gegl/gimptilehandlervalidate.h"
+
+#include "gimpasync.h"
+#include "gimpchannel.h"
+#include "gimpdrawable-filters.h"
+#include "gimpdrawable-histogram.h"
+#include "gimphistogram.h"
+#include "gimpimage.h"
+#include "gimpprojectable.h"
+
+
+/* local function prototypes */
+
+static GimpAsync * gimp_drawable_calculate_histogram_internal (GimpDrawable *drawable,
+ GimpHistogram *histogram,
+ gboolean with_filters,
+ gboolean run_async);
+
+
+/* private functions */
+
+
+static GimpAsync *
+gimp_drawable_calculate_histogram_internal (GimpDrawable *drawable,
+ GimpHistogram *histogram,
+ gboolean with_filters,
+ gboolean run_async)
+{
+ GimpAsync *async = NULL;
+ GimpImage *image;
+ GimpChannel *mask;
+ gint x, y, width, height;
+
+ if (! gimp_item_mask_intersect (GIMP_ITEM (drawable), &x, &y, &width, &height))
+ goto end;
+
+ image = gimp_item_get_image (GIMP_ITEM (drawable));
+ mask = gimp_image_get_mask (image);
+
+ if (FALSE)
+ {
+ GeglNode *node = gegl_node_new ();
+ GeglNode *source;
+ GeglNode *histogram_sink;
+ GeglProcessor *processor;
+
+ if (with_filters)
+ {
+ source = gimp_drawable_get_source_node (drawable);
+ }
+ else
+ {
+ source =
+ gimp_gegl_add_buffer_source (node,
+ gimp_drawable_get_buffer (drawable),
+ 0, 0);
+ }
+
+ histogram_sink =
+ gegl_node_new_child (node,
+ "operation", "gimp:histogram-sink",
+ "histogram", histogram,
+ NULL);
+
+ gegl_node_connect_to (source, "output",
+ histogram_sink, "input");
+
+ if (! gimp_channel_is_empty (mask))
+ {
+ GeglNode *mask_source;
+ gint off_x, off_y;
+
+ g_printerr ("adding mask aux\n");
+
+ gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
+
+ mask_source =
+ gimp_gegl_add_buffer_source (node,
+ gimp_drawable_get_buffer (GIMP_DRAWABLE (mask)),
+ -off_x, -off_y);
+
+ gegl_node_connect_to (mask_source, "output",
+ histogram_sink, "aux");
+ }
+
+ processor = gegl_node_new_processor (histogram_sink,
+ GEGL_RECTANGLE (x, y, width, height));
+
+ while (gegl_processor_work (processor, NULL));
+
+ g_object_unref (processor);
+ g_object_unref (node);
+ }
+ else
+ {
+ GeglBuffer *buffer = gimp_drawable_get_buffer (drawable);
+ GimpProjectable *projectable = NULL;
+
+ if (with_filters && gimp_drawable_has_filters (drawable))
+ {
+ GimpTileHandlerValidate *validate;
+ GeglNode *node;
+
+ node = gimp_drawable_get_source_node (drawable);
+
+ buffer = gegl_buffer_new (gegl_buffer_get_extent (buffer),
+ gegl_buffer_get_format (buffer));
+
+ validate =
+ GIMP_TILE_HANDLER_VALIDATE (gimp_tile_handler_validate_new (node));
+
+ gimp_tile_handler_validate_assign (validate, buffer);
+
+ g_object_unref (validate);
+
+ gimp_tile_handler_validate_invalidate (validate,
+ gegl_buffer_get_extent (buffer));
+
+#if 0
+ /* this would keep the buffer updated across drawable or
+ * filter changes, but the histogram is created in one go
+ * and doesn't need the signal connection
+ */
+ g_signal_connect_object (node, "invalidated",
+ G_CALLBACK (gimp_tile_handler_validate_invalidate),
+ validate, G_CONNECT_SWAPPED);
+#endif
+
+ if (GIMP_IS_PROJECTABLE (drawable))
+ projectable = GIMP_PROJECTABLE (drawable);
+ }
+ else
+ {
+ g_object_ref (buffer);
+ }
+
+ if (projectable)
+ gimp_projectable_begin_render (projectable);
+
+ if (! gimp_channel_is_empty (mask))
+ {
+ gint off_x, off_y;
+
+ gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
+
+ if (run_async)
+ {
+ async = gimp_histogram_calculate_async (
+ histogram, buffer,
+ GEGL_RECTANGLE (x, y, width, height),
+ gimp_drawable_get_buffer (GIMP_DRAWABLE (mask)),
+ GEGL_RECTANGLE (x + off_x, y + off_y,
+ width, height));
+ }
+ else
+ {
+ gimp_histogram_calculate (
+ histogram, buffer,
+ GEGL_RECTANGLE (x, y, width, height),
+ gimp_drawable_get_buffer (GIMP_DRAWABLE (mask)),
+ GEGL_RECTANGLE (x + off_x, y + off_y,
+ width, height));
+ }
+ }
+ else
+ {
+ if (run_async)
+ {
+ async = gimp_histogram_calculate_async (
+ histogram, buffer,
+ GEGL_RECTANGLE (x, y, width, height),
+ NULL, NULL);
+ }
+ else
+ {
+ gimp_histogram_calculate (
+ histogram, buffer,
+ GEGL_RECTANGLE (x, y, width, height),
+ NULL, NULL);
+ }
+ }
+
+ if (projectable)
+ gimp_projectable_end_render (projectable);
+
+ g_object_unref (buffer);
+ }
+
+end:
+ if (run_async && ! async)
+ {
+ async = gimp_async_new ();
+
+ gimp_async_finish (async, NULL);
+ }
+
+ return async;
+}
+
+
+/* public functions */
+
+
+void
+gimp_drawable_calculate_histogram (GimpDrawable *drawable,
+ GimpHistogram *histogram,
+ gboolean with_filters)
+{
+ g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
+ g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
+ g_return_if_fail (histogram != NULL);
+
+ gimp_drawable_calculate_histogram_internal (drawable,
+ histogram, with_filters,
+ FALSE);
+}
+
+GimpAsync *
+gimp_drawable_calculate_histogram_async (GimpDrawable *drawable,
+ GimpHistogram *histogram,
+ gboolean with_filters)
+{
+ g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
+ g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
+ g_return_val_if_fail (histogram != NULL, NULL);
+
+ return gimp_drawable_calculate_histogram_internal (drawable,
+ histogram, with_filters,
+ TRUE);
+}