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-rw-r--r--src/ui/tools/dropper-tool.cpp414
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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 "color-rgba.h"
+#include "desktop-style.h"
+#include "desktop.h"
+#include "document-undo.h"
+#include "message-context.h"
+#include "preferences.h"
+#include "selection.h"
+#include "sp-cursor.h"
+#include "verbs.h"
+
+#include "display/canvas-bpath.h"
+#include "display/canvas-arena.h"
+#include "display/curve.h"
+#include "display/cairo-utils.h"
+
+#include "include/macros.h"
+
+#include "object/sp-namedview.h"
+
+#include "ui/pixmaps/cursor-dropper-f.xpm"
+#include "ui/pixmaps/cursor-dropper-s.xpm"
+#include "ui/pixmaps/cursor-dropping-f.xpm"
+#include "ui/pixmaps/cursor-dropping-s.xpm"
+
+#include "svg/svg-color.h"
+
+#include "ui/tools/dropper-tool.h"
+
+using Inkscape::DocumentUndo;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+const std::string& DropperTool::getPrefsPath() {
+ return DropperTool::prefsPath;
+}
+
+const std::string DropperTool::prefsPath = "/tools/dropper";
+
+DropperTool::DropperTool()
+ : ToolBase(cursor_dropper_f_xpm)
+ , R(0)
+ , G(0)
+ , B(0)
+ , alpha(0)
+ , radius(0)
+ , invert(false)
+ , stroke(false)
+ , dropping(false)
+ , dragging(false)
+ , grabbed(nullptr)
+ , area(nullptr)
+ , centre(0, 0)
+{
+}
+
+DropperTool::~DropperTool() = default;
+
+void DropperTool::setup() {
+ ToolBase::setup();
+
+ /* TODO: have a look at CalligraphicTool::setup where the same is done.. generalize? */
+ Geom::PathVector path = Geom::Path(Geom::Circle(0,0,1));
+
+ SPCurve *c = new SPCurve(path);
+
+ this->area = sp_canvas_bpath_new(this->desktop->getControls(), c);
+
+ c->unref();
+
+ sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(this->area), 0x00000000,(SPWindRule)0);
+ sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(this->area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
+ sp_canvas_item_hide(this->area);
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+ if (prefs->getBool("/tools/dropper/selcue")) {
+ this->enableSelectionCue();
+ }
+
+ if (prefs->getBool("/tools/dropper/gradientdrag")) {
+ this->enableGrDrag();
+ }
+}
+
+void DropperTool::finish() {
+ this->enableGrDrag(false);
+
+ if (this->grabbed) {
+ sp_canvas_item_ungrab(this->grabbed);
+ this->grabbed = nullptr;
+ }
+
+ if (this->area) {
+ sp_canvas_item_destroy(this->area);
+ this->area = nullptr;
+ }
+
+ ToolBase::finish();
+}
+
+/**
+ * Returns the current dropper context color.
+ */
+guint32 DropperTool::get_color(bool invert) {
+ 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);
+
+ return SP_RGBA32_F_COMPOSE(
+ fabs(invert - this->R),
+ fabs(invert - this->G),
+ fabs(invert - this->B),
+ (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? this->alpha : 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 instead.
+ 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 = 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 = 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->space_panning) {
+ this->centre = Geom::Point(event->button.x, event->button.y);
+ this->dragging = true;
+ ret = TRUE;
+ }
+
+ sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+ GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK |
+ GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
+ nullptr, event->button.time);
+ this->grabbed = SP_CANVAS_ITEM(desktop->acetate);
+
+ 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 if (!this->space_panning) {
+ // otherwise, constantly calculate color no matter is any button pressed or not
+ double rw = 0.0;
+ double R(0), G(0), B(0), A(0);
+
+ if (this->dragging) {
+ // calculate average
+
+ // radius
+ 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) );
+ sp_canvas_item_affine_absolute(this->area, sm);
+ sp_canvas_item_show(this->area);
+
+ /* Get buffer */
+ Geom::Rect r(this->centre, this->centre);
+ r.expandBy(rw);
+ if (!r.hasZeroArea()) {
+ Geom::IntRect area = r.roundOutwards();
+ cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, area.width(), area.height());
+ sp_canvas_arena_render_surface(SP_CANVAS_ARENA(desktop->getDrawing()), s, area);
+ ink_cairo_surface_average_color_premul(s, R, G, B, A);
+ cairo_surface_destroy(s);
+ }
+ } else {
+ // pick single pixel
+ Geom::IntRect area = Geom::IntRect::from_xywh(floor(event->button.x), floor(event->button.y), 1, 1);
+ cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
+ sp_canvas_arena_render_surface(SP_CANVAS_ARENA(desktop->getDrawing()), s, area);
+ ink_cairo_surface_average_color_premul(s, R, G, B, A);
+ cairo_surface_destroy(s);
+ }
+
+ if (pick == SP_DROPPER_PICK_VISIBLE) {
+ // compose with page color
+ guint32 bg = desktop->getNamedView()->pagecolor;
+ R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
+ G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
+ B = B + (SP_RGBA32_B_F(bg)) * (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 && (R != this->R || G != this->G || B != this->B || A != this->alpha)) {
+ this->R = R;
+ this->G = G;
+ this->B = B;
+ this->alpha = A;
+ }
+ ret = TRUE;
+ }
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ if (event->button.button == 1 && !this->space_panning) {
+ sp_canvas_item_hide(this->area);
+ this->dragging = false;
+
+ if (this->grabbed) {
+ sp_canvas_item_ungrab(this->grabbed);
+ this->grabbed = nullptr;
+ }
+
+ 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);
+ }
+ } else {
+ if (prefs->getBool("/tools/dropper/onetimepick", false)) {
+ // "One time" pick from Fill/Stroke dialog stroke page, always apply fill or stroke (ignore <Shift> key)
+ stroke = (prefs->getInt("/dialogs/fillstroke/page", 0) == 0) ? false : true;
+ }
+ }
+
+ // do the actual color setting
+ sp_desktop_set_color(desktop, ColorRGBA(this->get_color(this->invert)), false, !this->stroke);
+
+ // REJON: set aux. toolbar input to hex color!
+ if (!(desktop->getSelection()->isEmpty())) {
+ DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_DROPPER,
+ _("Set picked color"));
+ }
+ if(this->dropping) {
+ selection->setList(old_selection);
+ }
+
+ if (prefs->getBool("/tools/dropper/onetimepick", false)) {
+ prefs->setBool("/tools/dropper/onetimepick", false);
+ sp_toggle_dropper(desktop);
+
+ // sp_toggle_dropper will delete ourselves.
+ // Thus, make sure we return immediately.
+ return true;
+ }
+
+ 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
+ auto xpm = (this->dropping ? (this->stroke ? cursor_dropping_s_xpm : cursor_dropping_f_xpm) :
+ (this->stroke ? cursor_dropper_s_xpm : cursor_dropper_f_xpm));
+ GdkCursor *cursor = sp_cursor_from_xpm(xpm, this->get_color(this->invert));
+ GdkWindow* window = gtk_widget_get_window(GTK_WIDGET(desktop->getCanvas()));
+ gdk_window_set_cursor(window, cursor);
+ g_object_unref(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 :
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-03 22:57:38 +0000