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diff --git a/src/ui/tools/dropper-tool.cpp b/src/ui/tools/dropper-tool.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Tool for picking colors from drawing
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 1999-2005 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glibmm/i18n.h>
+#include <gdk/gdk.h>
+#include <gdk/gdkkeysyms.h>
+
+#include <2geom/transforms.h>
+#include <2geom/circle.h>
+
+#include "desktop-style.h"
+#include "desktop.h"
+#include "document-undo.h"
+#include "message-context.h"
+#include "preferences.h"
+#include "selection.h"
+#include "style.h"
+#include "page-manager.h"
+
+#include "display/curve.h"
+#include "display/drawing.h"
+#include "display/control/canvas-item-bpath.h"
+#include "display/control/canvas-item-drawing.h"
+
+#include "include/macros.h"
+
+#include "object/sp-namedview.h"
+
+#include "svg/svg-color.h"
+
+#include "ui/cursor-utils.h"
+#include "ui/icon-names.h"
+#include "ui/tools/dropper-tool.h"
+#include "ui/widget/canvas.h"
+
+using Inkscape::DocumentUndo;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+DropperTool::DropperTool(SPDesktop *desktop)
+ : ToolBase(desktop, "/tools/dropper", "dropper-pick-fill.svg")
+{
+ area = make_canvasitem<CanvasItemBpath>(desktop->getCanvasControls());
+ area->set_stroke(0x0000007f);
+ area->set_fill(0x0, SP_WIND_RULE_EVENODD);
+ area->hide();
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+ if (prefs->getBool("/tools/dropper/selcue")) {
+ this->enableSelectionCue();
+ }
+
+ if (prefs->getBool("/tools/dropper/gradientdrag")) {
+ this->enableGrDrag();
+ }
+}
+
+DropperTool::~DropperTool()
+{
+ this->enableGrDrag(false);
+
+ ungrabCanvasEvents();
+}
+
+/**
+ * Returns the current dropper context color.
+ *
+ * - If in dropping mode, returns color from selected objects.
+ * Ignored if non_dropping set to true.
+ * - If in dragging mode, returns average color on canvas, depending on radius
+ * - If in pick mode, alpha is not premultiplied. Alpha is only set if in pick mode
+ * and setalpha is true. Both values are taken from preferences.
+ *
+ * @param invert If true, invert the rgb value
+ * @param non_dropping If true, use color from canvas, even in dropping mode.
+ */
+guint32 DropperTool::get_color(bool invert, bool non_dropping) {
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+ int pick = prefs->getInt("/tools/dropper/pick", SP_DROPPER_PICK_VISIBLE);
+ bool setalpha = prefs->getBool("/tools/dropper/setalpha", true);
+
+ // non_dropping ignores dropping mode and always uses color from canvas.
+ // Used by the clipboard
+ double r = non_dropping ? this->non_dropping_R : this->R;
+ double g = non_dropping ? this->non_dropping_G : this->G;
+ double b = non_dropping ? this->non_dropping_B : this->B;
+ double a = non_dropping ? this->non_dropping_A : this->alpha;
+
+ return SP_RGBA32_F_COMPOSE(
+ fabs(invert - r),
+ fabs(invert - g),
+ fabs(invert - b),
+ (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? a : 1.0);
+}
+
+bool DropperTool::root_handler(GdkEvent* event) {
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+ int ret = FALSE;
+ int pick = prefs->getInt("/tools/dropper/pick", SP_DROPPER_PICK_VISIBLE);
+
+ // Decide first what kind of 'mode' we're in.
+ if (event->type == GDK_KEY_PRESS || event->type == GDK_KEY_RELEASE) {
+ switch (event->key.keyval) {
+ case GDK_KEY_Shift_L:
+ case GDK_KEY_Shift_R:
+ this->stroke = event->type == GDK_KEY_PRESS;
+ break;
+ case GDK_KEY_Control_L:
+ case GDK_KEY_Control_R:
+ this->dropping = event->type == GDK_KEY_PRESS;
+ break;
+ case GDK_KEY_Alt_L:
+ case GDK_KEY_Alt_R:
+ this->invert = event->type == GDK_KEY_PRESS;
+ break;
+ }
+ }
+
+ // Get color from selected object
+ // Only if dropping mode enabled and object's color is set.
+ // Otherwise dropping mode disabled.
+ if(this->dropping) {
+ Inkscape::Selection *selection = _desktop->getSelection();
+ g_assert(selection);
+ guint32 apply_color;
+ bool apply_set = false;
+ for (auto& obj: selection->objects()) {
+ if(obj->style) {
+ double opacity = 1.0;
+ if(!this->stroke && obj->style->fill.set) {
+ if(obj->style->fill_opacity.set) {
+ opacity = SP_SCALE24_TO_FLOAT(obj->style->fill_opacity.value);
+ }
+ apply_color = obj->style->fill.value.color.toRGBA32(opacity);
+ apply_set = true;
+ } else if(this->stroke && obj->style->stroke.set) {
+ if(obj->style->stroke_opacity.set) {
+ opacity = SP_SCALE24_TO_FLOAT(obj->style->stroke_opacity.value);
+ }
+ apply_color = obj->style->stroke.value.color.toRGBA32(opacity);
+ apply_set = true;
+ }
+ }
+ }
+ if(apply_set) {
+ this->R = SP_RGBA32_R_F(apply_color);
+ this->G = SP_RGBA32_G_F(apply_color);
+ this->B = SP_RGBA32_B_F(apply_color);
+ this->alpha = SP_RGBA32_A_F(apply_color);
+ } else {
+ // This means that having no selection or some other error
+ // we will default back to normal dropper mode.
+ this->dropping = false;
+ }
+ }
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ if (event->button.button == 1) {
+ this->centre = Geom::Point(event->button.x, event->button.y);
+ this->dragging = true;
+ ret = TRUE;
+ }
+
+ grabCanvasEvents(Gdk::KEY_PRESS_MASK |
+ Gdk::KEY_RELEASE_MASK |
+ Gdk::BUTTON_RELEASE_MASK |
+ Gdk::POINTER_MOTION_MASK |
+ Gdk::BUTTON_PRESS_MASK );
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ if (event->motion.state & GDK_BUTTON2_MASK || event->motion.state & GDK_BUTTON3_MASK) {
+ // pass on middle and right drag
+ ret = FALSE;
+ break;
+ } else {
+ // otherwise, constantly calculate color no matter if any button pressed or not
+
+ Geom::IntRect pick_area;
+ if (this->dragging) {
+ // calculate average
+
+ // radius
+ double rw = std::min(Geom::L2(Geom::Point(event->button.x, event->button.y) - this->centre), 400.0);
+ if (rw == 0) { // happens sometimes, little idea why...
+ break;
+ }
+ this->radius = rw;
+
+ Geom::Point const cd = _desktop->w2d(this->centre);
+ Geom::Affine const w2dt = _desktop->w2d();
+ const double scale = rw * w2dt.descrim();
+ Geom::Affine const sm( Geom::Scale(scale, scale) * Geom::Translate(cd) );
+
+ // Show circle on canvas
+ Geom::PathVector path = Geom::Path(Geom::Circle(0, 0, 1)); // Unit circle centered at origin.
+ path *= sm;
+ this->area->set_bpath(std::move(path));
+ this->area->show();
+
+ /* Get buffer */
+ Geom::Rect r(this->centre, this->centre);
+ r.expandBy(rw);
+ if (!r.hasZeroArea()) {
+ pick_area = r.roundOutwards();
+
+ }
+ } else {
+ // pick single pixel
+ pick_area = Geom::IntRect::from_xywh(floor(event->button.x), floor(event->button.y), 1, 1);
+ }
+
+ Inkscape::CanvasItemDrawing *canvas_item_drawing = _desktop->getCanvasDrawing();
+ Inkscape::Drawing *drawing = canvas_item_drawing->get_drawing();
+
+ // Get average color.
+ double R, G, B, A;
+ drawing->averageColor(pick_area, R, G, B, A);
+
+ if (pick == SP_DROPPER_PICK_VISIBLE) {
+ // compose with page color
+ auto bg = _desktop->getDocument()->getPageManager().getDefaultBackgroundColor();
+ R = R + bg[0] * (1 - A);
+ G = G + bg[1] * (1 - A);
+ B = B + bg[2] * (1 - A);
+ A = 1.0;
+ } else {
+ // un-premultiply color channels
+ if (A > 0) {
+ R /= A;
+ G /= A;
+ B /= A;
+ }
+ }
+
+ if (fabs(A) < 1e-4) {
+ A = 0; // suppress exponentials, CSS does not allow that
+ }
+
+ // remember color
+ if (!this->dropping) {
+ this->R = R;
+ this->G = G;
+ this->B = B;
+ this->alpha = A;
+ }
+ // remember color from canvas, even in dropping mode
+ // These values are used by the clipboard
+ this->non_dropping_R = R;
+ this->non_dropping_G = G;
+ this->non_dropping_B = B;
+ this->non_dropping_A = A;
+
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ if (event->button.button == 1) {
+ this->area->hide();
+ this->dragging = false;
+
+ ungrabCanvasEvents();
+
+ Inkscape::Selection *selection = _desktop->getSelection();
+ g_assert(selection);
+ std::vector<SPItem *> old_selection(selection->items().begin(), selection->items().end());
+ if(this->dropping) {
+ Geom::Point const button_w(event->button.x, event->button.y);
+ // remember clicked item, disregarding groups, honoring Alt
+ this->item_to_select = sp_event_context_find_item (_desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE);
+
+ // Change selected object to object under cursor
+ if (this->item_to_select) {
+ std::vector<SPItem *> vec(selection->items().begin(), selection->items().end());
+ selection->set(this->item_to_select);
+ }
+ }
+
+ auto picked_color = ColorRGBA(this->get_color(this->invert));
+
+ // One time pick has active signal, call them all and clear.
+ if (!onetimepick_signal.empty())
+ {
+ onetimepick_signal.emit(&picked_color);
+ onetimepick_signal.clear();
+ // Do this last as it destroys the picker tool.
+ sp_toggle_dropper(_desktop);
+ return true;
+ }
+
+ // do the actual color setting
+ sp_desktop_set_color(_desktop, picked_color, false, !this->stroke);
+
+ // REJON: set aux. toolbar input to hex color!
+ if (!(_desktop->getSelection()->isEmpty())) {
+ DocumentUndo::done(_desktop->getDocument(), _("Set picked color"), INKSCAPE_ICON("color-picker"));
+ }
+ if(this->dropping) {
+ selection->setList(old_selection);
+ }
+
+
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_KEY_PRESS:
+ switch (get_latin_keyval(&event->key)) {
+ case GDK_KEY_Up:
+ case GDK_KEY_Down:
+ case GDK_KEY_KP_Up:
+ case GDK_KEY_KP_Down:
+ // prevent the zoom field from activation
+ if (!MOD__CTRL_ONLY(event)) {
+ ret = TRUE;
+ }
+ break;
+ case GDK_KEY_Escape:
+ _desktop->getSelection()->clear();
+ break;
+ }
+ break;
+ }
+
+ // set the status message to the right text.
+ gchar c[64];
+ sp_svg_write_color(c, sizeof(c), this->get_color(this->invert));
+
+ // alpha of color under cursor, to show in the statusbar
+ // locale-sensitive printf is OK, since this goes to the UI, not into SVG
+ gchar *alpha = g_strdup_printf(_(" alpha %.3g"), this->alpha);
+ // where the color is picked, to show in the statusbar
+ gchar *where = this->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) this->radius) : g_strdup_printf("%s", _(" under cursor"));
+ // message, to show in the statusbar
+ const gchar *message = this->dragging ? _("<b>Release mouse</b> to set color.") : _("<b>Click</b> to set fill, <b>Shift+click</b> to set stroke; <b>drag</b> to average color in area; with <b>Alt</b> to pick inverse color; <b>Ctrl+C</b> to copy the color under mouse to clipboard");
+
+ this->defaultMessageContext()->setF(
+ Inkscape::NORMAL_MESSAGE,
+ "<b>%s%s</b>%s. %s", c,
+ (pick == SP_DROPPER_PICK_VISIBLE) ? "" : alpha, where, message);
+
+ g_free(where);
+ g_free(alpha);
+
+ // Set the right cursor for the mode and apply the special Fill color
+ _cursor_filename = (this->dropping ? (this->stroke ? "dropper-drop-stroke.svg" : "dropper-drop-fill.svg") :
+ (this->stroke ? "dropper-pick-stroke.svg" : "dropper-pick-fill.svg") );
+
+ // We do this ourselves to get color correct.
+ auto display = _desktop->getCanvas()->get_display();
+ auto window = _desktop->getCanvas()->get_window();
+ auto cursor = load_svg_cursor(display, window, _cursor_filename, get_color(invert));
+ window->set_cursor(cursor);
+
+ if (!ret) {
+ ret = ToolBase::root_handler(event);
+ }
+
+ return ret;
+}
+
+}
+}
+}
+
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :