1 files changed, 172 insertions, 0 deletions
diff --git a/src/ui/widget/color-preview.cpp b/src/ui/widget/color-preview.cpp
new file mode 100644
index 0000000..ab81c60
--- /dev/null
+++ b/src/ui/widget/color-preview.cpp
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Ralf Stephan <ralf@ark.in-berlin.de>
+ *
+ * Copyright (C) 2001-2005 Authors
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "ui/widget/color-preview.h"
+#include "display/cairo-utils.h"
+#include <cairo.h>
+
+#define SPCP_DEFAULT_WIDTH 32
+#define SPCP_DEFAULT_HEIGHT 12
+
+namespace Inkscape {
+    namespace UI {
+        namespace Widget {
+
+ColorPreview::ColorPreview (guint32 rgba)
+{
+    _rgba = rgba;
+    set_has_window(false);
+    set_name("ColorPreview");
+}
+
+void
+ColorPreview::on_size_allocate (Gtk::Allocation &all)
+{
+    set_allocation (all);
+    if (get_is_drawable())
+        queue_draw();
+}
+
+void
+ColorPreview::get_preferred_height_vfunc(int& minimum_height, int& natural_height) const
+{
+    minimum_height = natural_height = SPCP_DEFAULT_HEIGHT;
+}
+
+void
+ColorPreview::get_preferred_height_for_width_vfunc(int /* width */, int& minimum_height, int& natural_height) const
+{
+    minimum_height = natural_height = SPCP_DEFAULT_HEIGHT;
+}
+
+void
+ColorPreview::get_preferred_width_vfunc(int& minimum_width, int& natural_width) const
+{
+    minimum_width = natural_width = SPCP_DEFAULT_WIDTH;
+}
+
+void
+ColorPreview::get_preferred_width_for_height_vfunc(int /* height */, int& minimum_width, int& natural_width) const
+{
+    minimum_width = natural_width = SPCP_DEFAULT_WIDTH;
+}
+
+void
+ColorPreview::setRgba32 (guint32 rgba)
+{
+    _rgba = rgba;
+
+    if (get_is_drawable())
+        queue_draw();
+}
+
+bool
+ColorPreview::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
+{
+    double x, y, width, height;
+    const Gtk::Allocation& allocation = get_allocation();
+    x = 0;
+    y = 0;
+    width = allocation.get_width()/2.0;
+    height = allocation.get_height() - 1;
+
+    double radius = height / 7.5;
+    double degrees = M_PI / 180.0;
+    cairo_new_sub_path (cr->cobj());
+    cairo_line_to(cr->cobj(), width, 0);
+    cairo_line_to(cr->cobj(), width, height);
+    cairo_arc (cr->cobj(), x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees);
+    cairo_arc (cr->cobj(), x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
+    cairo_close_path (cr->cobj());
+
+    /* Transparent area */
+
+    cairo_pattern_t *checkers = ink_cairo_pattern_create_checkerboard();
+
+    cairo_set_source(cr->cobj(), checkers);
+    cr->fill_preserve();
+    ink_cairo_set_source_rgba32(cr->cobj(), _rgba);
+    cr->fill();
+    cairo_pattern_destroy(checkers);
+
+    /* Solid area */
+
+    x = width;
+
+    cairo_new_sub_path (cr->cobj());
+    cairo_arc (cr->cobj(), x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees);
+    cairo_arc (cr->cobj(), x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees);
+    cairo_line_to(cr->cobj(), x, height);
+    cairo_line_to(cr->cobj(), x, y);
+    cairo_close_path (cr->cobj());
+    ink_cairo_set_source_rgba32(cr->cobj(), _rgba | 0xff);
+    cr->fill();
+    
+    return true;
+}
+
+GdkPixbuf*
+ColorPreview::toPixbuf (int width, int height)
+{
+    GdkRectangle carea;
+    gint w2;
+    w2 = width / 2;
+
+    cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+    cairo_t *ct = cairo_create(s);
+
+    /* Transparent area */
+    carea.x = 0;
+    carea.y = 0;
+    carea.width = w2;
+    carea.height = height;
+
+    cairo_pattern_t *checkers = ink_cairo_pattern_create_checkerboard();
+
+   //  cairo_rectangle(ct, carea.x, carea.y, carea.width, carea.height);
+    cairo_arc(ct, carea.x + carea.width / 2, carea.y + carea.height / 2, carea.width / 2, 0, 2 * M_PI);
+    cairo_set_source(ct, checkers);
+    cairo_fill_preserve(ct);
+    ink_cairo_set_source_rgba32(ct, _rgba);
+    cairo_fill(ct);
+
+    cairo_pattern_destroy(checkers);
+
+    /* Solid area */
+    carea.x = w2;
+    carea.y = 0;
+    carea.width = width - w2;
+    carea.height = height;
+
+    cairo_rectangle(ct, carea.x, carea.y, carea.width, carea.height);
+    ink_cairo_set_source_rgba32(ct, _rgba | 0xff);
+    cairo_fill(ct);
+
+    cairo_destroy(ct);
+    cairo_surface_flush(s);
+
+    GdkPixbuf* pixbuf = ink_pixbuf_create_from_cairo_surface(s);
+    return pixbuf;
+}
+
+}}}
+
+/*
+  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 :