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gimp/libgimpwidgets/gimpcolorarea.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpcolorarea.c
* Copyright (C) 2001 Sven Neumann
*
* 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
* Library 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.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimpcolorarea.h"
#define DRAG_PREVIEW_SIZE 32
#define DRAG_ICON_OFFSET -8
enum
{
COLOR_CHANGED,
LAST_SIGNAL
};
static void gimp_color_area_class_init (GimpColorAreaClass *klass);
static void gimp_color_area_init (GimpColorArea *gca);
static void gimp_color_area_destroy (GtkObject *object);
static void gimp_color_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_color_area_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gimp_color_area_update (GimpColorArea *gca);
static gboolean gimp_color_area_idle_update (gpointer data);
static void gimp_color_area_drag_begin (GtkWidget *widget,
GdkDragContext *context);
static void gimp_color_area_drag_end (GtkWidget *widget,
GdkDragContext *context);
static void gimp_color_area_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint time);
static void gimp_color_area_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time);
static const GtkTargetEntry targets[] = { { "application/x-color", 0 } };
static guint gimp_color_area_signals[LAST_SIGNAL] = { 0 };
static GtkDrawingAreaClass * parent_class = NULL;
GType
gimp_color_area_get_type (void)
{
static GType gca_type = 0;
if (! gca_type)
{
static const GTypeInfo gca_info =
{
sizeof (GimpColorAreaClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_color_area_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpColorArea),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_color_area_init,
};
gca_type = g_type_register_static (GTK_TYPE_DRAWING_AREA,
"GimpColorArea",
&gca_info, 0);
}
return gca_type;
}
static void
gimp_color_area_class_init (GimpColorAreaClass *klass)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = GTK_OBJECT_CLASS (klass);
widget_class = GTK_WIDGET_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gimp_color_area_signals[COLOR_CHANGED] =
g_signal_new ("color_changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpColorAreaClass, color_changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->destroy = gimp_color_area_destroy;
widget_class->size_allocate = gimp_color_area_size_allocate;
widget_class->expose_event = gimp_color_area_expose;
widget_class->drag_begin = gimp_color_area_drag_begin;
widget_class->drag_end = gimp_color_area_drag_end;
widget_class->drag_data_received = gimp_color_area_drag_data_received;
widget_class->drag_data_get = gimp_color_area_drag_data_get;
klass->color_changed = NULL;
}
static void
gimp_color_area_init (GimpColorArea *gca)
{
gimp_rgba_set (&gca->color, 0.0, 0.0, 0.0, 1.0);
gca->buf = NULL;
gca->width = 0;
gca->height = 0;
gca->rowstride = 0;
gca->type = GIMP_COLOR_AREA_FLAT;
gca->idle_id = 0;
}
static void
gimp_color_area_destroy (GtkObject *object)
{
GimpColorArea *gca;
g_return_if_fail (GIMP_IS_COLOR_AREA (object));
gca = GIMP_COLOR_AREA (object);
if (gca->buf)
{
g_free (gca->buf);
gca->buf = NULL;
gca->width = 0;
gca->height = 0;
gca->rowstride = 0;
}
if (gca->idle_id)
{
g_source_remove (gca->idle_id);
gca->idle_id = 0;
}
if (GTK_OBJECT_CLASS (parent_class)->destroy)
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gimp_color_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpColorArea *gca;
gca = GIMP_COLOR_AREA (widget);
if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
if (widget->allocation.width != gca->width ||
widget->allocation.height != gca->height)
{
gca->width = widget->allocation.width;
gca->height = widget->allocation.height;
gca->rowstride = (gca->width * 3 + 3) & ~0x3;
g_free (gca->buf);
gca->buf = g_new (guchar, gca->rowstride * gca->height);
gimp_color_area_update (gca);
}
}
static gboolean
gimp_color_area_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpColorArea *gca;
guchar *buf;
gca = GIMP_COLOR_AREA (widget);
if (gca->idle_id || ! gca->buf || ! GTK_WIDGET_DRAWABLE (widget))
return FALSE;
buf = gca->buf + event->area.y * gca->rowstride + event->area.x * 3;
gdk_draw_rgb_image_dithalign (widget->window,
widget->style->black_gc,
event->area.x,
event->area.y,
event->area.width,
event->area.height,
GDK_RGB_DITHER_MAX,
buf,
gca->rowstride,
event->area.x,
event->area.y);
return FALSE;
}
/**
* gimp_color_area_new:
* @color: A pointer to a #GimpRGB struct.
* @type: The type of color area to create.
* @drag_mask: The event_mask that should trigger drags.
*
* Creates a new #GimpColorArea widget.
*
* This returns a preview area showing the color. It handles color
* DND. If the color changes, the "color_changed" signal is emitted.
*
* Returns: Pointer to the new #GimpColorArea widget.
**/
GtkWidget *
gimp_color_area_new (const GimpRGB *color,
GimpColorAreaType type,
GdkModifierType drag_mask)
{
GimpColorArea *gca;
g_return_val_if_fail (color != NULL, NULL);
gca = g_object_new (GIMP_TYPE_COLOR_AREA, NULL);
gca->color = *color;
gca->type = type;
gtk_drag_dest_set (GTK_WIDGET (gca),
GTK_DEST_DEFAULT_HIGHLIGHT |
GTK_DEST_DEFAULT_MOTION |
GTK_DEST_DEFAULT_DROP,
targets, 1,
GDK_ACTION_COPY);
/* do we need this ?? */
drag_mask &= (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK);
if (drag_mask)
gtk_drag_source_set (GTK_WIDGET (gca),
drag_mask,
targets, 1,
GDK_ACTION_COPY | GDK_ACTION_MOVE);
return GTK_WIDGET (gca);
}
/**
* gimp_color_area_set_color:
* @gca: Pointer to a #GimpColorArea.
* @color:
*
**/
void
gimp_color_area_set_color (GimpColorArea *gca,
const GimpRGB *color)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (gca));
g_return_if_fail (color != NULL);
if (gimp_rgba_distance (&gca->color, color) > 0.000001)
{
gca->color = *color;
gimp_color_area_update (gca);
g_signal_emit (G_OBJECT (gca),
gimp_color_area_signals[COLOR_CHANGED], 0);
}
}
void
gimp_color_area_get_color (GimpColorArea *gca,
GimpRGB *color)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (gca));
g_return_if_fail (color != NULL);
*color = gca->color;
}
gboolean
gimp_color_area_has_alpha (GimpColorArea *gca)
{
g_return_val_if_fail (GIMP_IS_COLOR_AREA (gca), FALSE);
return gca->type != GIMP_COLOR_AREA_FLAT;
}
void
gimp_color_area_set_type (GimpColorArea *gca,
GimpColorAreaType type)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (gca));
gca->type = type;
gimp_color_area_update (gca);
}
static void
gimp_color_area_update (GimpColorArea *gca)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (gca));
if (gca->idle_id)
{
g_source_remove (gca->idle_id);
}
gca->idle_id = g_idle_add_full (G_PRIORITY_LOW,
(GSourceFunc) gimp_color_area_idle_update,
gca,
NULL);
}
static gboolean
gimp_color_area_idle_update (gpointer data)
{
GimpColorArea *gca;
GtkWidget *widget;
guint width, height;
guint x, y;
guint check_size = 0;
guchar light[3];
guchar dark[3];
guchar opaque[3];
guchar *p;
gdouble frac;
gca = GIMP_COLOR_AREA (data);
widget = GTK_WIDGET (data);
gca->idle_id = 0;
if (! GTK_WIDGET_REALIZED (widget))
return FALSE;
if (! gca->buf)
return FALSE;
width = gca->width;
height = gca->height;
switch (gca->type)
{
case GIMP_COLOR_AREA_FLAT:
check_size = 0;
break;
case GIMP_COLOR_AREA_SMALL_CHECKS:
check_size = GIMP_CHECK_SIZE_SM;
break;
case GIMP_COLOR_AREA_LARGE_CHECKS:
check_size = GIMP_CHECK_SIZE;
break;
}
opaque[0] = gca->color.r * 255.999;
opaque[1] = gca->color.g * 255.999;
opaque[2] = gca->color.b * 255.999;
if (check_size && gca->color.a < 1.0)
{
light[0] = (GIMP_CHECK_LIGHT +
(gca->color.r - GIMP_CHECK_LIGHT) * gca->color.a) * 255.999;
dark[0] = (GIMP_CHECK_DARK +
(gca->color.r - GIMP_CHECK_DARK) * gca->color.a) * 255.999;
light[1] = (GIMP_CHECK_LIGHT +
(gca->color.g - GIMP_CHECK_LIGHT) * gca->color.a) * 255.999;
dark[1] = (GIMP_CHECK_DARK +
(gca->color.g - GIMP_CHECK_DARK) * gca->color.a) * 255.999;
light[2] = (GIMP_CHECK_LIGHT +
(gca->color.b - GIMP_CHECK_LIGHT) * gca->color.a) * 255.999;
dark[2] = (GIMP_CHECK_DARK +
(gca->color.b - GIMP_CHECK_DARK) * gca->color.a) * 255.999;
for (y = 0; y < height; y++)
{
p = gca->buf + y * gca->rowstride;
for (x = 0; x < width; x++)
{
if ((width - x) * height > y * width)
{
*p++ = opaque[0];
*p++ = opaque[1];
*p++ = opaque[2];
continue;
}
frac = y - (gdouble) ((width - x) * height) / (gdouble) width;
if (((x / check_size) ^ (y / check_size)) & 1)
{
if ((gint) frac)
{
*p++ = light[0];
*p++ = light[1];
*p++ = light[2];
}
else
{
*p++ = (gdouble) light[0] * frac +
(gdouble) opaque[0] * (1.0 - frac);
*p++ = (gdouble) light[1] * frac +
(gdouble) opaque[1] * (1.0 - frac);
*p++ = (gdouble) light[2] * frac +
(gdouble) opaque[2] * (1.0 - frac);
}
}
else
{
if ((gint) frac)
{
*p++ = dark[0];
*p++ = dark[1];
*p++ = dark[2];
}
else
{
*p++ = (gdouble) dark[0] * frac +
(gdouble) opaque[0] * (1.0 - frac);
*p++ = (gdouble) dark[1] * frac +
(gdouble) opaque[1] * (1.0 - frac);
*p++ = (gdouble) dark[2] * frac +
(gdouble) opaque[2] * (1.0 - frac);
}
}
}
}
}
else
{
for (y = 0; y < height; y++)
{
p = gca->buf + y * gca->rowstride;
for (x = 0; x < width; x++)
{
*p++ = opaque[0];
*p++ = opaque[1];
*p++ = opaque[2];
}
}
}
gtk_widget_queue_draw (GTK_WIDGET (gca));
return FALSE;
}
static void
gimp_color_area_drag_begin (GtkWidget *widget,
GdkDragContext *context)
{
GimpRGB color;
GtkWidget *window;
GtkWidget *frame;
GtkWidget *color_area;
window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_widget_realize (window);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
gtk_container_add (GTK_CONTAINER (window), frame);
gimp_color_area_get_color (GIMP_COLOR_AREA (widget), &color);
color_area = gimp_color_area_new (&color,
GIMP_COLOR_AREA (widget)->type,
0);
gtk_widget_set_size_request (color_area,
DRAG_PREVIEW_SIZE, DRAG_PREVIEW_SIZE);
gtk_container_add (GTK_CONTAINER (frame), color_area);
gtk_widget_show (color_area);
gtk_widget_show (frame);
g_object_set_data_full (G_OBJECT (widget),
"gimp-color-area-drag-window",
window,
(GDestroyNotify) gtk_widget_destroy);
gtk_drag_set_icon_widget (context, window,
DRAG_ICON_OFFSET, DRAG_ICON_OFFSET);
}
static void
gimp_color_area_drag_end (GtkWidget *widget,
GdkDragContext *context)
{
g_object_set_data (G_OBJECT (widget),
"gimp-color-area-drag-window", NULL);
}
static void
gimp_color_area_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint time)
{
GimpColorArea *gca;
GimpRGB color;
guint16 *vals;
gca = GIMP_COLOR_AREA (widget);
if (selection_data->length < 0)
return;
if ((selection_data->format != 16) ||
(selection_data->length != 8))
{
g_warning ("Received invalid color data");
return;
}
vals = (guint16 *)selection_data->data;
gimp_rgba_set (&color,
(gdouble) vals[0] / 0xffff,
(gdouble) vals[1] / 0xffff,
(gdouble) vals[2] / 0xffff,
(gdouble) vals[3] / 0xffff);
gimp_color_area_set_color (gca, &color);
}
static void
gimp_color_area_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time)
{
GimpColorArea *gca;
guint16 vals[4];
gca = GIMP_COLOR_AREA (widget);
vals[0] = gca->color.r * 0xffff;
vals[1] = gca->color.g * 0xffff;
vals[2] = gca->color.b * 0xffff;
if (gca->type == GIMP_COLOR_AREA_FLAT)
vals[3] = 0xffff;
else
vals[3] = gca->color.a * 0xffff;
gtk_selection_data_set (selection_data,
gdk_atom_intern ("application/x-color", FALSE),
16, (guchar *)vals, 8);
}
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