/* HSV color selector for GTK+ * * Copyright (C) 1999 The Free Software Foundation * * Authors: Simon Budig (original code) * Federico Mena-Quintero (cleanup for GTK+) * Jonathan Blandford (cleanup for GTK+) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "config.h" #include #include #include "gtkhsv.h" #include "gtkbindings.h" #include "gtkmarshalers.h" #include "gtktypebuiltins.h" #include "gtkintl.h" /** * SECTION:gtkhsv * @Short_description: A 'color wheel' widget * @Title: GtkHSV * @See_also: #GtkColorSelection, #GtkColorSelectionDialog * * #GtkHSV is the 'color wheel' part of a complete color selector widget. * It allows to select a color by determining its HSV components in an * intuitive way. Moving the selection around the outer ring changes the hue, * and moving the selection point inside the inner triangle changes value and * saturation. */ /* Default width/height */ #define DEFAULT_SIZE 100 /* Default ring width */ #define DEFAULT_RING_WIDTH 10 /* Dragging modes */ typedef enum { DRAG_NONE, DRAG_H, DRAG_SV } DragMode; /* Private part of the GtkHSV structure */ struct _GtkHSVPrivate { /* Color value */ double h; double s; double v; /* Size and ring width */ int size; int ring_width; /* Window for capturing events */ GdkWindow *window; /* Dragging mode */ DragMode mode; guint focus_on_ring : 1; }; /* Signal IDs */ enum { CHANGED, MOVE, LAST_SIGNAL }; static void gtk_hsv_destroy (GtkWidget *widget); static void gtk_hsv_realize (GtkWidget *widget); static void gtk_hsv_unrealize (GtkWidget *widget); static void gtk_hsv_get_preferred_width (GtkWidget *widget, gint *minimum, gint *natural); static void gtk_hsv_get_preferred_height (GtkWidget *widget, gint *minimum, gint *natural); static void gtk_hsv_size_allocate (GtkWidget *widget, GtkAllocation *allocation); static gboolean gtk_hsv_button_press (GtkWidget *widget, GdkEventButton *event); static gboolean gtk_hsv_button_release (GtkWidget *widget, GdkEventButton *event); static gboolean gtk_hsv_motion (GtkWidget *widget, GdkEventMotion *event); static gboolean gtk_hsv_draw (GtkWidget *widget, cairo_t *cr); static gboolean gtk_hsv_grab_broken (GtkWidget *widget, GdkEventGrabBroken *event); static gboolean gtk_hsv_focus (GtkWidget *widget, GtkDirectionType direction); static void gtk_hsv_move (GtkHSV *hsv, GtkDirectionType dir); static guint hsv_signals[LAST_SIGNAL]; G_DEFINE_TYPE (GtkHSV, gtk_hsv, GTK_TYPE_WIDGET) /* Class initialization function for the HSV color selector */ static void gtk_hsv_class_init (GtkHSVClass *class) { GObjectClass *gobject_class; GtkWidgetClass *widget_class; GtkHSVClass *hsv_class; GtkBindingSet *binding_set; gobject_class = (GObjectClass *) class; widget_class = (GtkWidgetClass *) class; hsv_class = GTK_HSV_CLASS (class); widget_class->destroy = gtk_hsv_destroy; widget_class->realize = gtk_hsv_realize; widget_class->unrealize = gtk_hsv_unrealize; widget_class->get_preferred_width = gtk_hsv_get_preferred_width; widget_class->get_preferred_height = gtk_hsv_get_preferred_height; widget_class->size_allocate = gtk_hsv_size_allocate; widget_class->button_press_event = gtk_hsv_button_press; widget_class->button_release_event = gtk_hsv_button_release; widget_class->motion_notify_event = gtk_hsv_motion; widget_class->draw = gtk_hsv_draw; widget_class->focus = gtk_hsv_focus; widget_class->grab_broken_event = gtk_hsv_grab_broken; hsv_class->move = gtk_hsv_move; hsv_signals[CHANGED] = g_signal_new (I_("changed"), G_OBJECT_CLASS_TYPE (gobject_class), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GtkHSVClass, changed), NULL, NULL, _gtk_marshal_VOID__VOID, G_TYPE_NONE, 0); hsv_signals[MOVE] = g_signal_new (I_("move"), G_OBJECT_CLASS_TYPE (gobject_class), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GtkHSVClass, move), NULL, NULL, _gtk_marshal_VOID__ENUM, G_TYPE_NONE, 1, GTK_TYPE_DIRECTION_TYPE); binding_set = gtk_binding_set_by_class (class); gtk_binding_entry_add_signal (binding_set, GDK_KEY_Up, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_UP); gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Up, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_UP); gtk_binding_entry_add_signal (binding_set, GDK_KEY_Down, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_DOWN); gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Down, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_DOWN); gtk_binding_entry_add_signal (binding_set, GDK_KEY_Right, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_RIGHT); gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Right, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_RIGHT); gtk_binding_entry_add_signal (binding_set, GDK_KEY_Left, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_LEFT); gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Left, 0, "move", 1, G_TYPE_ENUM, GTK_DIR_LEFT); g_type_class_add_private (gobject_class, sizeof (GtkHSVPrivate)); } static void gtk_hsv_init (GtkHSV *hsv) { GtkHSVPrivate *priv; priv = G_TYPE_INSTANCE_GET_PRIVATE (hsv, GTK_TYPE_HSV, GtkHSVPrivate); hsv->priv = priv; gtk_widget_set_has_window (GTK_WIDGET (hsv), FALSE); gtk_widget_set_can_focus (GTK_WIDGET (hsv), TRUE); priv->h = 0.0; priv->s = 0.0; priv->v = 0.0; priv->size = DEFAULT_SIZE; priv->ring_width = DEFAULT_RING_WIDTH; } static void gtk_hsv_destroy (GtkWidget *widget) { GTK_WIDGET_CLASS (gtk_hsv_parent_class)->destroy (widget); } static void gtk_hsv_realize (GtkWidget *widget) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; GtkAllocation allocation; GdkWindow *parent_window; GdkWindowAttr attr; int attr_mask; gtk_widget_set_realized (widget, TRUE); gtk_widget_get_allocation (widget, &allocation); attr.window_type = GDK_WINDOW_CHILD; attr.x = allocation.x; attr.y = allocation.y; attr.width = allocation.width; attr.height = allocation.height; attr.wclass = GDK_INPUT_ONLY; attr.event_mask = gtk_widget_get_events (widget); attr.event_mask |= (GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK); attr_mask = GDK_WA_X | GDK_WA_Y; parent_window = gtk_widget_get_parent_window (widget); gtk_widget_set_window (widget, parent_window); g_object_ref (parent_window); priv->window = gdk_window_new (parent_window, &attr, attr_mask); gdk_window_set_user_data (priv->window, hsv); gdk_window_show (priv->window); } static void gtk_hsv_unrealize (GtkWidget *widget) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; gdk_window_set_user_data (priv->window, NULL); gdk_window_destroy (priv->window); priv->window = NULL; GTK_WIDGET_CLASS (gtk_hsv_parent_class)->unrealize (widget); } static void gtk_hsv_get_preferred_width (GtkWidget *widget, gint *minimum, gint *natural) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; gint focus_width; gint focus_pad; gtk_widget_style_get (widget, "focus-line-width", &focus_width, "focus-padding", &focus_pad, NULL); *minimum = priv->size + 2 * (focus_width + focus_pad); *natural = priv->size + 2 * (focus_width + focus_pad); } static void gtk_hsv_get_preferred_height (GtkWidget *widget, gint *minimum, gint *natural) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; gint focus_width; gint focus_pad; gtk_widget_style_get (widget, "focus-line-width", &focus_width, "focus-padding", &focus_pad, NULL); *minimum = priv->size + 2 * (focus_width + focus_pad); *natural = priv->size + 2 * (focus_width + focus_pad); } static void gtk_hsv_size_allocate (GtkWidget *widget, GtkAllocation *allocation) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; gtk_widget_set_allocation (widget, allocation); if (gtk_widget_get_realized (widget)) gdk_window_move_resize (priv->window, allocation->x, allocation->y, allocation->width, allocation->height); } /* Utility functions */ #define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11) /* Converts from HSV to RGB */ static void hsv_to_rgb (gdouble *h, gdouble *s, gdouble *v) { gdouble hue, saturation, value; gdouble f, p, q, t; if (*s == 0.0) { *h = *v; *s = *v; *v = *v; /* heh */ } else { hue = *h * 6.0; saturation = *s; value = *v; if (hue == 6.0) hue = 0.0; f = hue - (int) hue; p = value * (1.0 - saturation); q = value * (1.0 - saturation * f); t = value * (1.0 - saturation * (1.0 - f)); switch ((int) hue) { case 0: *h = value; *s = t; *v = p; break; case 1: *h = q; *s = value; *v = p; break; case 2: *h = p; *s = value; *v = t; break; case 3: *h = p; *s = q; *v = value; break; case 4: *h = t; *s = p; *v = value; break; case 5: *h = value; *s = p; *v = q; break; default: g_assert_not_reached (); } } } /* Converts from RGB to HSV */ static void rgb_to_hsv (gdouble *r, gdouble *g, gdouble *b) { gdouble red, green, blue; gdouble h, s, v; gdouble min, max; gdouble delta; red = *r; green = *g; blue = *b; h = 0.0; if (red > green) { if (red > blue) max = red; else max = blue; if (green < blue) min = green; else min = blue; } else { if (green > blue) max = green; else max = blue; if (red < blue) min = red; else min = blue; } v = max; if (max != 0.0) s = (max - min) / max; else s = 0.0; if (s == 0.0) h = 0.0; else { delta = max - min; if (red == max) h = (green - blue) / delta; else if (green == max) h = 2 + (blue - red) / delta; else if (blue == max) h = 4 + (red - green) / delta; h /= 6.0; if (h < 0.0) h += 1.0; else if (h > 1.0) h -= 1.0; } *r = h; *g = s; *b = v; } /* Computes the vertices of the saturation/value triangle */ static void compute_triangle (GtkHSV *hsv, gint *hx, gint *hy, gint *sx, gint *sy, gint *vx, gint *vy) { GtkHSVPrivate *priv = hsv->priv; GtkWidget *widget = GTK_WIDGET (hsv); gdouble center_x; gdouble center_y; gdouble inner, outer; gdouble angle; center_x = gtk_widget_get_allocated_width (widget) / 2.0; center_y = gtk_widget_get_allocated_height (widget) / 2.0; outer = priv->size / 2.0; inner = outer - priv->ring_width; angle = priv->h * 2.0 * G_PI; *hx = floor (center_x + cos (angle) * inner + 0.5); *hy = floor (center_y - sin (angle) * inner + 0.5); *sx = floor (center_x + cos (angle + 2.0 * G_PI / 3.0) * inner + 0.5); *sy = floor (center_y - sin (angle + 2.0 * G_PI / 3.0) * inner + 0.5); *vx = floor (center_x + cos (angle + 4.0 * G_PI / 3.0) * inner + 0.5); *vy = floor (center_y - sin (angle + 4.0 * G_PI / 3.0) * inner + 0.5); } /* Computes whether a point is inside the hue ring */ static gboolean is_in_ring (GtkHSV *hsv, gdouble x, gdouble y) { GtkHSVPrivate *priv = hsv->priv; GtkWidget *widget = GTK_WIDGET (hsv); gdouble dx, dy, dist; gdouble center_x; gdouble center_y; gdouble inner, outer; center_x = gtk_widget_get_allocated_width (widget) / 2.0; center_y = gtk_widget_get_allocated_height (widget) / 2.0; outer = priv->size / 2.0; inner = outer - priv->ring_width; dx = x - center_x; dy = center_y - y; dist = dx * dx + dy * dy; return (dist >= inner * inner && dist <= outer * outer); } /* Computes a saturation/value pair based on the mouse coordinates */ static void compute_sv (GtkHSV *hsv, gdouble x, gdouble y, gdouble *s, gdouble *v) { GtkWidget *widget = GTK_WIDGET (hsv); int ihx, ihy, isx, isy, ivx, ivy; double hx, hy, sx, sy, vx, vy; double center_x; double center_y; compute_triangle (hsv, &ihx, &ihy, &isx, &isy, &ivx, &ivy); center_x = gtk_widget_get_allocated_width (widget) / 2.0; center_y = gtk_widget_get_allocated_height (widget) / 2.0; hx = ihx - center_x; hy = center_y - ihy; sx = isx - center_x; sy = center_y - isy; vx = ivx - center_x; vy = center_y - ivy; x -= center_x; y = center_y - y; if (vx * (x - sx) + vy * (y - sy) < 0.0) { *s = 1.0; *v = (((x - sx) * (hx - sx) + (y - sy) * (hy-sy)) / ((hx - sx) * (hx - sx) + (hy - sy) * (hy - sy))); if (*v < 0.0) *v = 0.0; else if (*v > 1.0) *v = 1.0; } else if (hx * (x - sx) + hy * (y - sy) < 0.0) { *s = 0.0; *v = (((x - sx) * (vx - sx) + (y - sy) * (vy - sy)) / ((vx - sx) * (vx - sx) + (vy - sy) * (vy - sy))); if (*v < 0.0) *v = 0.0; else if (*v > 1.0) *v = 1.0; } else if (sx * (x - hx) + sy * (y - hy) < 0.0) { *v = 1.0; *s = (((x - vx) * (hx - vx) + (y - vy) * (hy - vy)) / ((hx - vx) * (hx - vx) + (hy - vy) * (hy - vy))); if (*s < 0.0) *s = 0.0; else if (*s > 1.0) *s = 1.0; } else { *v = (((x - sx) * (hy - vy) - (y - sy) * (hx - vx)) / ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx))); if (*v<= 0.0) { *v = 0.0; *s = 0.0; } else { if (*v > 1.0) *v = 1.0; if (fabs (hy - vy) < fabs (hx - vx)) *s = (x - sx - *v * (vx - sx)) / (*v * (hx - vx)); else *s = (y - sy - *v * (vy - sy)) / (*v * (hy - vy)); if (*s < 0.0) *s = 0.0; else if (*s > 1.0) *s = 1.0; } } } /* Computes whether a point is inside the saturation/value triangle */ static gboolean is_in_triangle (GtkHSV *hsv, gdouble x, gdouble y) { int hx, hy, sx, sy, vx, vy; double det, s, v; compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy); det = (vx - sx) * (hy - sy) - (vy - sy) * (hx - sx); s = ((x - sx) * (hy - sy) - (y - sy) * (hx - sx)) / det; v = ((vx - sx) * (y - sy) - (vy - sy) * (x - sx)) / det; return (s >= 0.0 && v >= 0.0 && s + v <= 1.0); } /* Computes a value based on the mouse coordinates */ static double compute_v (GtkHSV *hsv, gdouble x, gdouble y) { GtkWidget *widget = GTK_WIDGET (hsv); double center_x; double center_y; double dx, dy; double angle; center_x = gtk_widget_get_allocated_width (widget) / 2.0; center_y = gtk_widget_get_allocated_height (widget) / 2.0; dx = x - center_x; dy = center_y - y; angle = atan2 (dy, dx); if (angle < 0.0) angle += 2.0 * G_PI; return angle / (2.0 * G_PI); } /* Event handlers */ static void set_cross_grab (GtkHSV *hsv, GdkDevice *device, guint32 time) { GtkHSVPrivate *priv = hsv->priv; GdkCursor *cursor; cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (hsv)), GDK_CROSSHAIR); gdk_device_grab (device, priv->window, GDK_OWNERSHIP_NONE, FALSE, GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_RELEASE_MASK, cursor, time); g_object_unref (cursor); } static gboolean gtk_hsv_grab_broken (GtkWidget *widget, GdkEventGrabBroken *event) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; priv->mode = DRAG_NONE; return TRUE; } static gint gtk_hsv_button_press (GtkWidget *widget, GdkEventButton *event) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; double x, y; if (priv->mode != DRAG_NONE || event->button != 1) return FALSE; x = event->x; y = event->y; if (is_in_ring (hsv, x, y)) { priv->mode = DRAG_H; set_cross_grab (hsv, gdk_event_get_device ((GdkEvent *) event), event->time); gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v); gtk_widget_grab_focus (widget); priv->focus_on_ring = TRUE; return TRUE; } if (is_in_triangle (hsv, x, y)) { gdouble s, v; priv->mode = DRAG_SV; set_cross_grab (hsv, gdk_event_get_device ((GdkEvent *) event), event->time); compute_sv (hsv, x, y, &s, &v); gtk_hsv_set_color (hsv, priv->h, s, v); gtk_widget_grab_focus (widget); priv->focus_on_ring = FALSE; return TRUE; } return FALSE; } static gint gtk_hsv_button_release (GtkWidget *widget, GdkEventButton *event) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; DragMode mode; gdouble x, y; if (priv->mode == DRAG_NONE || event->button != 1) return FALSE; /* Set the drag mode to DRAG_NONE so that signal handlers for "catched" * can see that this is the final color state. */ mode = priv->mode; priv->mode = DRAG_NONE; x = event->x; y = event->y; if (mode == DRAG_H) { gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v); } else if (mode == DRAG_SV) { gdouble s, v; compute_sv (hsv, x, y, &s, &v); gtk_hsv_set_color (hsv, priv->h, s, v); } else { g_assert_not_reached (); } gdk_device_ungrab (gdk_event_get_device ((GdkEvent *) event), event->time); return TRUE; } static gint gtk_hsv_motion (GtkWidget *widget, GdkEventMotion *event) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; gdouble x, y; if (priv->mode == DRAG_NONE) return FALSE; gdk_event_request_motions (event); x = event->x; y = event->y; if (priv->mode == DRAG_H) { gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v); return TRUE; } else if (priv->mode == DRAG_SV) { gdouble s, v; compute_sv (hsv, x, y, &s, &v); gtk_hsv_set_color (hsv, priv->h, s, v); return TRUE; } g_assert_not_reached (); return FALSE; } /* Redrawing */ /* Paints the hue ring */ static void paint_ring (GtkHSV *hsv, cairo_t *cr) { GtkHSVPrivate *priv = hsv->priv; GtkWidget *widget = GTK_WIDGET (hsv); int xx, yy, width, height; gdouble dx, dy, dist; gdouble center_x; gdouble center_y; gdouble inner, outer; guint32 *buf, *p; gdouble angle; gdouble hue; gdouble r, g, b; cairo_surface_t *source; cairo_t *source_cr; gint stride; gint focus_width; gint focus_pad; gtk_widget_style_get (widget, "focus-line-width", &focus_width, "focus-padding", &focus_pad, NULL); width = gtk_widget_get_allocated_width (widget); height = gtk_widget_get_allocated_height (widget); center_x = width / 2.0; center_y = height / 2.0; outer = priv->size / 2.0; inner = outer - priv->ring_width; /* Create an image initialized with the ring colors */ stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width); buf = g_new (guint32, height * stride / 4); for (yy = 0; yy < height; yy++) { p = buf + yy * width; dy = -(yy - center_y); for (xx = 0; xx < width; xx++) { dx = xx - center_x; dist = dx * dx + dy * dy; if (dist < ((inner-1) * (inner-1)) || dist > ((outer+1) * (outer+1))) { *p++ = 0; continue; } angle = atan2 (dy, dx); if (angle < 0.0) angle += 2.0 * G_PI; hue = angle / (2.0 * G_PI); r = hue; g = 1.0; b = 1.0; hsv_to_rgb (&r, &g, &b); *p++ = (((int)floor (r * 255 + 0.5) << 16) | ((int)floor (g * 255 + 0.5) << 8) | (int)floor (b * 255 + 0.5)); } } source = cairo_image_surface_create_for_data ((unsigned char *)buf, CAIRO_FORMAT_RGB24, width, height, stride); /* Now draw the value marker onto the source image, so that it * will get properly clipped at the edges of the ring */ source_cr = cairo_create (source); r = priv->h; g = 1.0; b = 1.0; hsv_to_rgb (&r, &g, &b); if (INTENSITY (r, g, b) > 0.5) cairo_set_source_rgb (source_cr, 0., 0., 0.); else cairo_set_source_rgb (source_cr, 1., 1., 1.); cairo_move_to (source_cr, center_x, center_y); cairo_line_to (source_cr, center_x + cos (priv->h * 2.0 * G_PI) * priv->size / 2, center_y - sin (priv->h * 2.0 * G_PI) * priv->size / 2); cairo_stroke (source_cr); cairo_destroy (source_cr); /* Draw the ring using the source image */ cairo_save (cr); cairo_set_source_surface (cr, source, 0, 0); cairo_surface_destroy (source); cairo_set_line_width (cr, priv->ring_width); cairo_new_path (cr); cairo_arc (cr, center_x, center_y, priv->size / 2. - priv->ring_width / 2., 0, 2 * G_PI); cairo_stroke (cr); cairo_restore (cr); g_free (buf); } /* Converts an HSV triplet to an integer RGB triplet */ static void get_color (gdouble h, gdouble s, gdouble v, gint *r, gint *g, gint *b) { hsv_to_rgb (&h, &s, &v); *r = floor (h * 255 + 0.5); *g = floor (s * 255 + 0.5); *b = floor (v * 255 + 0.5); } #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t)) #define LERP(a, b, v1, v2, i) (((v2) - (v1) != 0) \ ? ((a) + ((b) - (a)) * ((i) - (v1)) / ((v2) - (v1))) \ : (a)) /* Number of pixels we extend out from the edges when creating * color source to avoid artifacts */ #define PAD 3 /* Paints the HSV triangle */ static void paint_triangle (GtkHSV *hsv, cairo_t *cr) { GtkHSVPrivate *priv = hsv->priv; GtkWidget *widget = GTK_WIDGET (hsv); gint hx, hy, sx, sy, vx, vy; /* HSV vertices */ gint x1, y1, r1, g1, b1; /* First vertex in scanline order */ gint x2, y2, r2, g2, b2; /* Second vertex */ gint x3, y3, r3, g3, b3; /* Third vertex */ gint t; guint32 *buf, *p, c; gint xl, xr, rl, rr, gl, gr, bl, br; /* Scanline data */ gint xx, yy; gint x_interp, y_interp; gint x_start, x_end; cairo_surface_t *source; gdouble r, g, b; gint stride; int width, height; GtkStyleContext *context; GtkStateFlags state; priv = hsv->priv; width = gtk_widget_get_allocated_width (widget); height = gtk_widget_get_allocated_height (widget); /* Compute triangle's vertices */ compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy); x1 = hx; y1 = hy; get_color (priv->h, 1.0, 1.0, &r1, &g1, &b1); x2 = sx; y2 = sy; get_color (priv->h, 1.0, 0.0, &r2, &g2, &b2); x3 = vx; y3 = vy; get_color (priv->h, 0.0, 1.0, &r3, &g3, &b3); if (y2 > y3) { SWAP (x2, x3, t); SWAP (y2, y3, t); SWAP (r2, r3, t); SWAP (g2, g3, t); SWAP (b2, b3, t); } if (y1 > y3) { SWAP (x1, x3, t); SWAP (y1, y3, t); SWAP (r1, r3, t); SWAP (g1, g3, t); SWAP (b1, b3, t); } if (y1 > y2) { SWAP (x1, x2, t); SWAP (y1, y2, t); SWAP (r1, r2, t); SWAP (g1, g2, t); SWAP (b1, b2, t); } /* Shade the triangle */ stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width); buf = g_new (guint32, height * stride / 4); for (yy = 0; yy < height; yy++) { p = buf + yy * width; if (yy >= y1 - PAD && yy < y3 + PAD) { y_interp = CLAMP (yy, y1, y3); if (y_interp < y2) { xl = LERP (x1, x2, y1, y2, y_interp); rl = LERP (r1, r2, y1, y2, y_interp); gl = LERP (g1, g2, y1, y2, y_interp); bl = LERP (b1, b2, y1, y2, y_interp); } else { xl = LERP (x2, x3, y2, y3, y_interp); rl = LERP (r2, r3, y2, y3, y_interp); gl = LERP (g2, g3, y2, y3, y_interp); bl = LERP (b2, b3, y2, y3, y_interp); } xr = LERP (x1, x3, y1, y3, y_interp); rr = LERP (r1, r3, y1, y3, y_interp); gr = LERP (g1, g3, y1, y3, y_interp); br = LERP (b1, b3, y1, y3, y_interp); if (xl > xr) { SWAP (xl, xr, t); SWAP (rl, rr, t); SWAP (gl, gr, t); SWAP (bl, br, t); } x_start = MAX (xl - PAD, 0); x_end = MIN (xr + PAD, width); x_start = MIN (x_start, x_end); c = (rl << 16) | (gl << 8) | bl; for (xx = 0; xx < x_start; xx++) *p++ = c; for (; xx < x_end; xx++) { x_interp = CLAMP (xx, xl, xr); *p++ = ((LERP (rl, rr, xl, xr, x_interp) << 16) | (LERP (gl, gr, xl, xr, x_interp) << 8) | LERP (bl, br, xl, xr, x_interp)); } c = (rr << 16) | (gr << 8) | br; for (; xx < width; xx++) *p++ = c; } } source = cairo_image_surface_create_for_data ((unsigned char *)buf, CAIRO_FORMAT_RGB24, width, height, stride); /* Draw a triangle with the image as a source */ cairo_set_source_surface (cr, source, 0, 0); cairo_surface_destroy (source); cairo_move_to (cr, x1, y1); cairo_line_to (cr, x2, y2); cairo_line_to (cr, x3, y3); cairo_close_path (cr); cairo_fill (cr); g_free (buf); /* Draw value marker */ xx = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5); yy = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5); r = priv->h; g = priv->s; b = priv->v; hsv_to_rgb (&r, &g, &b); context = gtk_widget_get_style_context (widget); gtk_style_context_save (context); state = gtk_widget_get_state_flags (widget); gtk_style_context_set_state (context, state); if (INTENSITY (r, g, b) > 0.5) { gtk_style_context_add_class (context, "light-area-focus"); cairo_set_source_rgb (cr, 0., 0., 0.); } else { gtk_style_context_add_class (context, "dark-area-focus"); cairo_set_source_rgb (cr, 1., 1., 1.); } #define RADIUS 4 #define FOCUS_RADIUS 6 cairo_new_path (cr); cairo_arc (cr, xx, yy, RADIUS, 0, 2 * G_PI); cairo_stroke (cr); /* Draw focus outline */ if (gtk_widget_has_focus (widget) && !priv->focus_on_ring) { gint focus_width; gint focus_pad; gtk_widget_style_get (widget, "focus-line-width", &focus_width, "focus-padding", &focus_pad, NULL); gtk_render_focus (context, cr, xx - FOCUS_RADIUS - focus_width - focus_pad, yy - FOCUS_RADIUS - focus_width - focus_pad, 2 * (FOCUS_RADIUS + focus_width + focus_pad), 2 * (FOCUS_RADIUS + focus_width + focus_pad)); } gtk_style_context_restore (context); } /* Paints the contents of the HSV color selector */ static gboolean gtk_hsv_draw (GtkWidget *widget, cairo_t *cr) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; paint_ring (hsv, cr); paint_triangle (hsv, cr); if (gtk_widget_has_focus (widget) && priv->focus_on_ring) { GtkStyleContext *context; GtkStateFlags state; context = gtk_widget_get_style_context (widget); state = gtk_widget_get_state_flags (widget); gtk_style_context_save (context); gtk_style_context_set_state (context, state); gtk_render_focus (context, cr, 0, 0, gtk_widget_get_allocated_width (widget), gtk_widget_get_allocated_height (widget)); gtk_style_context_restore (context); } return FALSE; } static gboolean gtk_hsv_focus (GtkWidget *widget, GtkDirectionType dir) { GtkHSV *hsv = GTK_HSV (widget); GtkHSVPrivate *priv = hsv->priv; if (!gtk_widget_has_focus (widget)) { if (dir == GTK_DIR_TAB_BACKWARD) priv->focus_on_ring = FALSE; else priv->focus_on_ring = TRUE; gtk_widget_grab_focus (GTK_WIDGET (hsv)); return TRUE; } switch (dir) { case GTK_DIR_UP: if (priv->focus_on_ring) return FALSE; else priv->focus_on_ring = TRUE; break; case GTK_DIR_DOWN: if (priv->focus_on_ring) priv->focus_on_ring = FALSE; else return FALSE; break; case GTK_DIR_LEFT: case GTK_DIR_TAB_BACKWARD: if (priv->focus_on_ring) return FALSE; else priv->focus_on_ring = TRUE; break; case GTK_DIR_RIGHT: case GTK_DIR_TAB_FORWARD: if (priv->focus_on_ring) priv->focus_on_ring = FALSE; else return FALSE; break; } gtk_widget_queue_draw (GTK_WIDGET (hsv)); return TRUE; } /** * gtk_hsv_new: * * Creates a new HSV color selector. * * Return value: A newly-created HSV color selector. * * Since: 2.14 */ GtkWidget* gtk_hsv_new (void) { return g_object_new (GTK_TYPE_HSV, NULL); } /** * gtk_hsv_set_color: * @hsv: An HSV color selector * @h: Hue * @s: Saturation * @v: Value * * Sets the current color in an HSV color selector. * Color component values must be in the [0.0, 1.0] range. * * Since: 2.14 */ void gtk_hsv_set_color (GtkHSV *hsv, gdouble h, gdouble s, gdouble v) { GtkHSVPrivate *priv; g_return_if_fail (GTK_IS_HSV (hsv)); g_return_if_fail (h >= 0.0 && h <= 1.0); g_return_if_fail (s >= 0.0 && s <= 1.0); g_return_if_fail (v >= 0.0 && v <= 1.0); priv = hsv->priv; priv->h = h; priv->s = s; priv->v = v; g_signal_emit (hsv, hsv_signals[CHANGED], 0); gtk_widget_queue_draw (GTK_WIDGET (hsv)); } /** * gtk_hsv_get_color: * @hsv: An HSV color selector * @h: (out): Return value for the hue * @s: (out): Return value for the saturation * @v: (out): Return value for the value * * Queries the current color in an HSV color selector. * Returned values will be in the [0.0, 1.0] range. * * Since: 2.14 */ void gtk_hsv_get_color (GtkHSV *hsv, double *h, double *s, double *v) { GtkHSVPrivate *priv = hsv->priv; g_return_if_fail (GTK_IS_HSV (hsv)); priv = hsv->priv; if (h) *h = priv->h; if (s) *s = priv->s; if (v) *v = priv->v; } /** * gtk_hsv_set_metrics: * @hsv: An HSV color selector * @size: Diameter for the hue ring * @ring_width: Width of the hue ring * * Sets the size and ring width of an HSV color selector. * * Since: 2.14 */ void gtk_hsv_set_metrics (GtkHSV *hsv, gint size, gint ring_width) { GtkHSVPrivate *priv = hsv->priv; int same_size; g_return_if_fail (GTK_IS_HSV (hsv)); g_return_if_fail (size > 0); g_return_if_fail (ring_width > 0); g_return_if_fail (2 * ring_width + 1 <= size); priv = hsv->priv; same_size = (priv->size == size); priv->size = size; priv->ring_width = ring_width; if (same_size) gtk_widget_queue_draw (GTK_WIDGET (hsv)); else gtk_widget_queue_resize (GTK_WIDGET (hsv)); } /** * gtk_hsv_get_metrics: * @hsv: An HSV color selector * @size: (out): Return value for the diameter of the hue ring * @ring_width: (out): Return value for the width of the hue ring * * Queries the size and ring width of an HSV color selector. * * Since: 2.14 */ void gtk_hsv_get_metrics (GtkHSV *hsv, gint *size, gint *ring_width) { GtkHSVPrivate *priv = hsv->priv; g_return_if_fail (GTK_IS_HSV (hsv)); priv = hsv->priv; if (size) *size = priv->size; if (ring_width) *ring_width = priv->ring_width; } /** * gtk_hsv_is_adjusting: * @hsv: A #GtkHSV * * An HSV color selector can be said to be adjusting if multiple rapid * changes are being made to its value, for example, when the user is * adjusting the value with the mouse. This function queries whether * the HSV color selector is being adjusted or not. * * Return value: %TRUE if clients can ignore changes to the color value, * since they may be transitory, or %FALSE if they should consider * the color value status to be final. * * Since: 2.14 */ gboolean gtk_hsv_is_adjusting (GtkHSV *hsv) { GtkHSVPrivate *priv = hsv->priv; g_return_val_if_fail (GTK_IS_HSV (hsv), FALSE); priv = hsv->priv; return priv->mode != DRAG_NONE; } /** * gtk_hsv_to_rgb: * @h: Hue * @s: Saturation * @v: Value * @r: (out): Return value for the red component * @g: (out): Return value for the green component * @b: (out): Return value for the blue component * * Converts a color from HSV space to RGB. * Input values must be in the [0.0, 1.0] range; * output values will be in the same range. * * Since: 2.14 */ void gtk_hsv_to_rgb (gdouble h, gdouble s, gdouble v, gdouble *r, gdouble *g, gdouble *b) { g_return_if_fail (h >= 0.0 && h <= 1.0); g_return_if_fail (s >= 0.0 && s <= 1.0); g_return_if_fail (v >= 0.0 && v <= 1.0); hsv_to_rgb (&h, &s, &v); if (r) *r = h; if (g) *g = s; if (b) *b = v; } /** * gtk_rgb_to_hsv: * @r: Red * @g: Green * @b: Blue * @h: (out): Return value for the hue component * @s: (out): Return value for the saturation component * @v: (out): Return value for the value component * * Converts a color from RGB space to HSV. * Input values must be in the [0.0, 1.0] range; * output values will be in the same range. * * Since: 2.14 */ void gtk_rgb_to_hsv (gdouble r, gdouble g, gdouble b, gdouble *h, gdouble *s, gdouble *v) { g_return_if_fail (r >= 0.0 && r <= 1.0); g_return_if_fail (g >= 0.0 && g <= 1.0); g_return_if_fail (b >= 0.0 && b <= 1.0); rgb_to_hsv (&r, &g, &b); if (h) *h = r; if (s) *s = g; if (v) *v = b; } static void gtk_hsv_move (GtkHSV *hsv, GtkDirectionType dir) { GtkHSVPrivate *priv = hsv->priv; gdouble hue, sat, val; gint hx, hy, sx, sy, vx, vy; /* HSV vertices */ gint x, y; /* position in triangle */ hue = priv->h; sat = priv->s; val = priv->v; compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy); x = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5); y = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5); #define HUE_DELTA 0.002 switch (dir) { case GTK_DIR_UP: if (priv->focus_on_ring) hue += HUE_DELTA; else { y -= 1; compute_sv (hsv, x, y, &sat, &val); } break; case GTK_DIR_DOWN: if (priv->focus_on_ring) hue -= HUE_DELTA; else { y += 1; compute_sv (hsv, x, y, &sat, &val); } break; case GTK_DIR_LEFT: if (priv->focus_on_ring) hue += HUE_DELTA; else { x -= 1; compute_sv (hsv, x, y, &sat, &val); } break; case GTK_DIR_RIGHT: if (priv->focus_on_ring) hue -= HUE_DELTA ; else { x += 1; compute_sv (hsv, x, y, &sat, &val); } break; default: /* we don't care about the tab directions */ break; } /* Wrap */ if (hue < 0.0) hue = 1.0; else if (hue > 1.0) hue = 0.0; gtk_hsv_set_color (hsv, hue, sat, val); }