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Diffstat (limited to 'app/core/gimpimage-pick-color.c')
-rw-r--r-- | app/core/gimpimage-pick-color.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/app/core/gimpimage-pick-color.c b/app/core/gimpimage-pick-color.c new file mode 100644 index 0000000..f8168cb --- /dev/null +++ b/app/core/gimpimage-pick-color.c @@ -0,0 +1,147 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995-2001 Spencer Kimball, Peter Mattis, and others + * + * 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 "core-types.h" + +#include "gegl/gimp-gegl-loops.h" + +#include "gimpchannel.h" +#include "gimpdrawable.h" +#include "gimpimage.h" +#include "gimpimage-pick-color.h" +#include "gimplayer.h" +#include "gimppickable.h" + + +gboolean +gimp_image_pick_color (GimpImage *image, + GimpDrawable *drawable, + gint x, + gint y, + gboolean show_all, + gboolean sample_merged, + gboolean sample_average, + gdouble average_radius, + const Babl **sample_format, + gpointer pixel, + GimpRGB *color) +{ + GimpPickable *pickable; + gboolean result; + + g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE); + g_return_val_if_fail (drawable == NULL || GIMP_IS_DRAWABLE (drawable), FALSE); + g_return_val_if_fail (drawable == NULL || + gimp_item_get_image (GIMP_ITEM (drawable)) == image, + FALSE); + + if (sample_merged && drawable) + { + if ((GIMP_IS_LAYER (drawable) && + gimp_image_get_n_layers (image) == 1) || + (GIMP_IS_CHANNEL (drawable) && + gimp_image_get_n_channels (image) == 1)) + { + /* Let's add a special exception when an image has only one + * layer. This was useful in particular for indexed image as + * it allows to pick the right index value even when "Sample + * merged" is checked. There are more possible exceptions, but + * we can't just take them all in considerations unless we + * want to make code extra-complicated). + * See #3041. + */ + sample_merged = FALSE; + } + } + + if (! sample_merged) + { + if (! drawable) + drawable = gimp_image_get_active_drawable (image); + + if (! drawable) + return FALSE; + } + + if (sample_merged) + { + if (! show_all) + pickable = GIMP_PICKABLE (image); + else + pickable = GIMP_PICKABLE (gimp_image_get_projection (image)); + } + else + { + gint off_x, off_y; + + gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y); + x -= off_x; + y -= off_y; + + pickable = GIMP_PICKABLE (drawable); + } + + /* Do *not* call gimp_pickable_flush() here because it's too expensive + * to call it unconditionally each time e.g. the cursor view is updated. + * Instead, call gimp_pickable_flush() in the callers if needed. + */ + + if (sample_format) + *sample_format = gimp_pickable_get_format (pickable); + + result = gimp_pickable_pick_color (pickable, x, y, + sample_average && + ! (show_all && sample_merged), + average_radius, + pixel, color); + + if (show_all && sample_merged) + { + const Babl *format = babl_format ("RaGaBaA double"); + gdouble sample[4] = {}; + + if (! result) + memset (pixel, 0, babl_format_get_bytes_per_pixel (*sample_format)); + + if (sample_average) + { + GeglBuffer *buffer = gimp_pickable_get_buffer (pickable); + gint radius = floor (average_radius); + + gimp_gegl_average_color (buffer, + GEGL_RECTANGLE (x - radius, + y - radius, + 2 * radius + 1, + 2 * radius + 1), + FALSE, GEGL_ABYSS_NONE, format, sample); + } + + if (! result || sample_average) + gimp_pickable_pixel_to_srgb (pickable, format, sample, color); + + result = TRUE; + } + + return result; +} |