2012-01-30 23:37:00 +00:00
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/* GTK - The GIMP Toolkit
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* Copyright (C) 2012 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "gtkhsv.h"
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#include "gtkcolorplane.h"
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struct _GtkColorPlanePrivate
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{
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cairo_surface_t *surface;
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gdouble h, s, v;
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gint x, y;
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gboolean in_drag;
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};
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enum
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{
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CHANGED,
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LAST_SIGNAL
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};
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guint signals[LAST_SIGNAL];
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G_DEFINE_TYPE (GtkColorPlane, gtk_color_plane, GTK_TYPE_DRAWING_AREA)
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static gboolean
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sv_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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gint x, y;
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gint width, height;
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cairo_set_source_surface (cr, plane->priv->surface, 0, 0);
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cairo_paint (cr);
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x = plane->priv->x;
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y = plane->priv->y;
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width = gtk_widget_get_allocated_width (widget);
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height = gtk_widget_get_allocated_height (widget);
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cairo_move_to (cr, 0, y + 0.5);
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cairo_line_to (cr, width, y + 0.5);
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cairo_move_to (cr, x + 0.5, 0);
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cairo_line_to (cr, x + 0.5, height);
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if (gtk_widget_has_visible_focus (widget))
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{
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cairo_set_line_width (cr, 3.0);
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cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
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cairo_stroke_preserve (cr);
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cairo_set_line_width (cr, 1.0);
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cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
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cairo_stroke (cr);
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}
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else
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{
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cairo_set_line_width (cr, 1.0);
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cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.8);
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cairo_stroke (cr);
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}
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return FALSE;
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}
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static void
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create_sv_surface (GtkColorPlane *plane)
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{
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GtkWidget *widget = GTK_WIDGET (plane);
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cairo_t *cr;
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cairo_surface_t *surface;
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gint width, height, stride;
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cairo_surface_t *tmp;
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guint red, green, blue;
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guint32 *data, *p;
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gdouble h, s, v;
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gdouble r, g, b;
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gdouble sf, vf;
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gint x, y;
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if (!gtk_widget_get_realized (widget))
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return;
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width = gtk_widget_get_allocated_width (widget);
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height = gtk_widget_get_allocated_height (widget);
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surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
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CAIRO_CONTENT_COLOR,
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width, height);
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if (plane->priv->surface)
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cairo_surface_destroy (plane->priv->surface);
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plane->priv->surface = surface;
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if (width == 1 || height == 1)
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return;
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stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
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2012-02-01 05:37:58 +00:00
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data = g_malloc (height * stride);
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2012-01-30 23:37:00 +00:00
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h = plane->priv->h;
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sf = 1.0 / (height - 1);
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vf = 1.0 / (width - 1);
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for (y = 0; y < height; y++)
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{
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s = CLAMP (1.0 - y * sf, 0.0, 1.0);
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p = data + y * (stride / 4);
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for (x = 0; x < width; x++)
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{
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v = x * vf;
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gtk_hsv_to_rgb (h, s, v, &r, &g, &b);
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red = CLAMP (r * 255, 0, 255);
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green = CLAMP (g * 255, 0, 255);
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blue = CLAMP (b * 255, 0, 255);
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p[x] = (red << 16) | (green << 8) | blue;
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}
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}
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tmp = cairo_image_surface_create_for_data ((guchar *)data, CAIRO_FORMAT_RGB24,
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width, height, stride);
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cr = cairo_create (surface);
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cairo_set_source_surface (cr, tmp, 0, 0);
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cairo_paint (cr);
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cairo_destroy (cr);
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cairo_surface_destroy (tmp);
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g_free (data);
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}
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static void
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hsv_to_xy (GtkColorPlane *plane)
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{
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gint width, height;
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width = gtk_widget_get_allocated_width (GTK_WIDGET (plane));
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height = gtk_widget_get_allocated_height (GTK_WIDGET (plane));
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plane->priv->x = CLAMP (width * plane->priv->v, 0, width - 1);
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plane->priv->y = CLAMP (height * (1 - plane->priv->s), 0, height - 1);
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}
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static gboolean
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sv_configure (GtkWidget *widget,
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GdkEventConfigure *event)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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create_sv_surface (plane);
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hsv_to_xy (plane);
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return TRUE;
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}
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static void
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set_cross_grab (GtkWidget *widget,
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GdkDevice *device,
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guint32 time)
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{
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GdkCursor *cursor;
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cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (widget)),
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GDK_CROSSHAIR);
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gdk_device_grab (device,
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gtk_widget_get_window (widget),
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GDK_OWNERSHIP_NONE,
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FALSE,
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GDK_POINTER_MOTION_MASK
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| GDK_POINTER_MOTION_HINT_MASK
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| GDK_BUTTON_RELEASE_MASK,
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cursor,
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time);
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g_object_unref (cursor);
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}
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static gboolean
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sv_grab_broken (GtkWidget *widget,
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GdkEventGrabBroken *event)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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plane->priv->in_drag = FALSE;
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return TRUE;
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}
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static void
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sv_update_color (GtkColorPlane *plane,
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gint x,
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gint y)
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{
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GtkWidget *widget = GTK_WIDGET (plane);
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plane->priv->x = x;
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plane->priv->y = y;
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plane->priv->s = CLAMP (1 - y * (1.0 / gtk_widget_get_allocated_height (widget)), 0, 1);
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plane->priv->v = CLAMP (x * (1.0 / gtk_widget_get_allocated_width (widget)), 0, 1);
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g_signal_emit (plane, signals[CHANGED], 0);
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gtk_widget_queue_draw (widget);
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}
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static gboolean
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sv_button_press (GtkWidget *widget,
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GdkEventButton *event)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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if (plane->priv->in_drag || event->button != GDK_BUTTON_PRIMARY)
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return FALSE;
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plane->priv->in_drag = TRUE;
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set_cross_grab (widget, gdk_event_get_device ((GdkEvent*)event), event->time);
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sv_update_color (plane, event->x, event->y);
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gtk_widget_grab_focus (widget);
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return TRUE;
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}
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static gboolean
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sv_button_release (GtkWidget *widget,
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GdkEventButton *event)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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if (!plane->priv->in_drag || event->button != GDK_BUTTON_PRIMARY)
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return FALSE;
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plane->priv->in_drag = FALSE;
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sv_update_color (plane, event->x, event->y);
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gdk_device_ungrab (gdk_event_get_device ((GdkEvent *) event), event->time);
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return TRUE;
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}
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static gboolean
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sv_motion (GtkWidget *widget,
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GdkEventMotion *event)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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if (!plane->priv->in_drag)
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return FALSE;
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gdk_event_request_motions (event);
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sv_update_color (plane, event->x, event->y);
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return TRUE;
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}
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static void
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sv_move (GtkColorPlane *plane,
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gdouble ds,
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gdouble dv)
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{
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if (plane->priv->s + ds > 1)
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{
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if (plane->priv->s < 1)
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plane->priv->s = 1;
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else
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goto error;
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}
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else if (plane->priv->s + ds < 0)
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{
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if (plane->priv->s > 0)
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plane->priv->s = 0;
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else
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goto error;
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}
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else
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{
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plane->priv->s += ds;
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}
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if (plane->priv->v + dv > 1)
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{
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if (plane->priv->v < 1)
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plane->priv->v = 1;
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else
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goto error;
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}
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else if (plane->priv->v + dv < 0)
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{
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if (plane->priv->v > 0)
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plane->priv->v = 0;
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else
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goto error;
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}
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else
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{
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plane->priv->v += dv;
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}
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hsv_to_xy (plane);
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g_signal_emit (plane, signals[CHANGED], 0);
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gtk_widget_queue_draw (GTK_WIDGET (plane));
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return;
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error:
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gtk_widget_error_bell (GTK_WIDGET (plane));
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}
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static gboolean
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sv_key_press (GtkWidget *widget,
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GdkEventKey *event)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
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gdouble step;
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/* FIXME: turn into bindings */
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if ((event->state & GDK_MOD1_MASK) != 0)
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step = 0.1;
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else
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step = 0.01;
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if (event->keyval == GDK_KEY_Up ||
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event->keyval == GDK_KEY_KP_Up)
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sv_move (plane, step, 0);
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else if (event->keyval == GDK_KEY_Down ||
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event->keyval == GDK_KEY_KP_Down)
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sv_move (plane, -step, 0);
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else if (event->keyval == GDK_KEY_Left ||
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event->keyval == GDK_KEY_KP_Left)
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sv_move (plane, 0, -step);
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else if (event->keyval == GDK_KEY_Right ||
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event->keyval == GDK_KEY_KP_Right)
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sv_move (plane, 0, step);
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else
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return FALSE;
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return TRUE;
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}
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static void
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gtk_color_plane_init (GtkColorPlane *plane)
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{
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plane->priv = G_TYPE_INSTANCE_GET_PRIVATE (plane,
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GTK_TYPE_COLOR_PLANE,
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GtkColorPlanePrivate);
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gtk_widget_set_can_focus (GTK_WIDGET (plane), TRUE);
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gtk_widget_set_events (GTK_WIDGET (plane), GDK_KEY_PRESS_MASK
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| GDK_BUTTON_PRESS_MASK
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| GDK_BUTTON_RELEASE_MASK
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| GDK_POINTER_MOTION_MASK);
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}
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static void
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sv_finalize (GObject *object)
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{
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GtkColorPlane *plane = GTK_COLOR_PLANE (object);
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cairo_surface_destroy (plane->priv->surface);
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G_OBJECT_CLASS (gtk_color_plane_parent_class)->finalize (object);
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}
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static void
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gtk_color_plane_class_init (GtkColorPlaneClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->finalize = sv_finalize;
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|
widget_class->draw = sv_draw;
|
|
|
|
widget_class->configure_event = sv_configure;
|
|
|
|
widget_class->button_press_event = sv_button_press;
|
|
|
|
widget_class->button_release_event = sv_button_release;
|
|
|
|
widget_class->motion_notify_event = sv_motion;
|
|
|
|
widget_class->grab_broken_event = sv_grab_broken;
|
|
|
|
widget_class->key_press_event = sv_key_press;
|
|
|
|
|
|
|
|
signals[CHANGED] =
|
|
|
|
g_signal_new ("changed",
|
|
|
|
GTK_TYPE_COLOR_PLANE,
|
|
|
|
G_SIGNAL_RUN_FIRST,
|
|
|
|
G_STRUCT_OFFSET (GtkColorPlaneClass, changed),
|
|
|
|
NULL, NULL,
|
|
|
|
NULL,
|
|
|
|
G_TYPE_NONE, 0);
|
|
|
|
|
|
|
|
g_type_class_add_private (class, sizeof (GtkColorPlanePrivate));
|
|
|
|
}
|
|
|
|
|
|
|
|
gdouble
|
|
|
|
gtk_color_plane_get_h (GtkColorPlane *plane)
|
|
|
|
{
|
|
|
|
return plane->priv->h;
|
|
|
|
}
|
|
|
|
|
|
|
|
gdouble
|
|
|
|
gtk_color_plane_get_s (GtkColorPlane *plane)
|
|
|
|
{
|
|
|
|
return plane->priv->s;
|
|
|
|
}
|
|
|
|
|
|
|
|
gdouble
|
|
|
|
gtk_color_plane_get_v (GtkColorPlane *plane)
|
|
|
|
{
|
|
|
|
return plane->priv->v;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
gtk_color_plane_set_h (GtkColorPlane *plane,
|
|
|
|
gdouble h)
|
|
|
|
{
|
|
|
|
plane->priv->h = h;
|
|
|
|
create_sv_surface (plane);
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (plane));
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
gtk_color_plane_set_s (GtkColorPlane *plane,
|
|
|
|
gdouble s)
|
|
|
|
{
|
|
|
|
plane->priv->s = s;
|
|
|
|
hsv_to_xy (plane);
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (plane));
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
gtk_color_plane_set_v (GtkColorPlane *plane,
|
|
|
|
gdouble v)
|
|
|
|
{
|
|
|
|
plane->priv->v = v;
|
|
|
|
hsv_to_xy (plane);
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (plane));
|
|
|
|
}
|
|
|
|
|
|
|
|
GtkWidget *
|
|
|
|
gtk_color_plane_new (void)
|
|
|
|
{
|
|
|
|
return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_PLANE, NULL);
|
|
|
|
}
|