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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) 2001-2002 Sven Neumann <sven@gimp.org>
*
* 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 3 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, see
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimpcairo-utils.h"
#include "gimpcolorarea.h"
/**
* SECTION: gimpcolorarea
* @title: GimpColorArea
* @short_description: Displays a #GimpRGB color, optionally with
* alpha-channel.
*
* Displays a #GimpRGB color, optionally with alpha-channel.
**/
#define DRAG_PREVIEW_SIZE 32
#define DRAG_ICON_OFFSET -8
enum
{
COLOR_CHANGED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_COLOR,
PROP_TYPE,
PROP_DRAG_MASK,
PROP_DRAW_BORDER
};
static void gimp_color_area_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_color_area_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_color_area_finalize (GObject *object);
static void gimp_color_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gimp_color_area_state_changed (GtkWidget *widget,
GtkStateType previous_state);
static gboolean gimp_color_area_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gimp_color_area_render_buf (GtkWidget *widget,
gboolean insensitive,
GimpColorAreaType type,
guchar *buf,
guint width,
guint height,
guint rowstride,
GimpRGB *color);
static void gimp_color_area_render (GimpColorArea *area);
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);
G_DEFINE_TYPE (GimpColorArea, gimp_color_area, GTK_TYPE_DRAWING_AREA)
#define parent_class gimp_color_area_parent_class
static guint gimp_color_area_signals[LAST_SIGNAL] = { 0 };
static const GtkTargetEntry target = { "application/x-color", 0 };
static void
gimp_color_area_class_init (GimpColorAreaClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpRGB color;
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->get_property = gimp_color_area_get_property;
object_class->set_property = gimp_color_area_set_property;
object_class->finalize = gimp_color_area_finalize;
widget_class->size_allocate = gimp_color_area_size_allocate;
widget_class->state_changed = gimp_color_area_state_changed;
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;
gimp_rgba_set (&color, 0.0, 0.0, 0.0, 1.0);
/**
* GimpColorArea:color:
*
* The color displayed in the color area.
*
* Since: GIMP 2.4
*/
g_object_class_install_property (object_class, PROP_COLOR,
gimp_param_spec_rgb ("color", NULL, NULL,
TRUE, &color,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
/**
* GimpColorArea:type:
*
* The type of the color area.
*
* Since: GIMP 2.4
*/
g_object_class_install_property (object_class, PROP_TYPE,
g_param_spec_enum ("type", NULL, NULL,
GIMP_TYPE_COLOR_AREA_TYPE,
GIMP_COLOR_AREA_FLAT,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
/**
* GimpColorArea:drag-type:
*
* The event_mask that should trigger drags.
*
* Since: GIMP 2.4
*/
g_object_class_install_property (object_class, PROP_DRAG_MASK,
g_param_spec_flags ("drag-mask", NULL, NULL,
GDK_TYPE_MODIFIER_TYPE,
0,
GIMP_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY));
/**
* GimpColorArea:draw-border:
*
* Whether to draw a thin border in the foreground color around the area.
*
* Since: GIMP 2.4
*/
g_object_class_install_property (object_class, PROP_DRAW_BORDER,
g_param_spec_boolean ("draw-border",
NULL, NULL,
FALSE,
GIMP_PARAM_READWRITE));
}
static void
gimp_color_area_init (GimpColorArea *area)
{
area->buf = NULL;
area->width = 0;
area->height = 0;
area->rowstride = 0;
area->draw_border = FALSE;
gtk_drag_dest_set (GTK_WIDGET (area),
GTK_DEST_DEFAULT_HIGHLIGHT |
GTK_DEST_DEFAULT_MOTION |
GTK_DEST_DEFAULT_DROP,
&target, 1,
GDK_ACTION_COPY);
}
static void
gimp_color_area_finalize (GObject *object)
{
GimpColorArea *area = GIMP_COLOR_AREA (object);
if (area->buf)
{
g_free (area->buf);
area->buf = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_color_area_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpColorArea *area = GIMP_COLOR_AREA (object);
switch (property_id)
{
case PROP_COLOR:
g_value_set_boxed (value, &area->color);
break;
case PROP_TYPE:
g_value_set_enum (value, area->type);
break;
case PROP_DRAW_BORDER:
g_value_set_boolean (value, area->draw_border);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_color_area_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpColorArea *area = GIMP_COLOR_AREA (object);
GdkModifierType drag_mask;
switch (property_id)
{
case PROP_COLOR:
gimp_color_area_set_color (area, g_value_get_boxed (value));
break;
case PROP_TYPE:
gimp_color_area_set_type (area, g_value_get_enum (value));
break;
case PROP_DRAG_MASK:
drag_mask = g_value_get_flags (value) & (GDK_BUTTON1_MASK |
GDK_BUTTON2_MASK |
GDK_BUTTON3_MASK);
if (drag_mask)
gtk_drag_source_set (GTK_WIDGET (area),
drag_mask,
&target, 1,
GDK_ACTION_COPY | GDK_ACTION_MOVE);
break;
case PROP_DRAW_BORDER:
gimp_color_area_set_draw_border (area, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_color_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpColorArea *area = GIMP_COLOR_AREA (widget);
if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
if (allocation->width != area->width ||
allocation->height != area->height)
{
area->width = allocation->width;
area->height = allocation->height;
area->rowstride = area->width * 4 + 4;
g_free (area->buf);
area->buf = g_new (guchar, area->rowstride * area->height);
area->needs_render = TRUE;
}
}
static void
gimp_color_area_state_changed (GtkWidget *widget,
GtkStateType previous_state)
{
if (gtk_widget_get_state (widget) == GTK_STATE_INSENSITIVE ||
previous_state == GTK_STATE_INSENSITIVE)
{
GIMP_COLOR_AREA (widget)->needs_render = TRUE;
}
if (GTK_WIDGET_CLASS (parent_class)->state_changed)
GTK_WIDGET_CLASS (parent_class)->state_changed (widget, previous_state);
}
static gboolean
gimp_color_area_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpColorArea *area = GIMP_COLOR_AREA (widget);
GtkStyle *style = gtk_widget_get_style (widget);
cairo_t *cr;
cairo_surface_t *buffer;
if (! area->buf || ! gtk_widget_is_drawable (widget))
return FALSE;
if (area->needs_render)
gimp_color_area_render (area);
cr = gdk_cairo_create (gtk_widget_get_window (widget));
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
buffer = cairo_image_surface_create_for_data (area->buf,
CAIRO_FORMAT_RGB24,
area->width,
area->height,
area->rowstride);
cairo_set_source_surface (cr, buffer, 0.0, 0.0);
cairo_surface_destroy (buffer);
cairo_paint (cr);
if (area->draw_border)
{
cairo_set_line_width (cr, 1.0);
gdk_cairo_set_source_color (cr,
&style->fg[gtk_widget_get_state (widget)]);
cairo_rectangle (cr, 0.5, 0.5, area->width - 1, area->height - 1);
cairo_stroke (cr);
}
cairo_destroy (cr);
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)
{
return g_object_new (GIMP_TYPE_COLOR_AREA,
"color", color,
"type", type,
"drag-mask", drag_mask,
NULL);
}
/**
* gimp_color_area_set_color:
* @area: Pointer to a #GimpColorArea.
* @color: Pointer to a #GimpRGB struct that defines the new color.
*
* Sets @area to a different @color.
**/
void
gimp_color_area_set_color (GimpColorArea *area,
const GimpRGB *color)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
g_return_if_fail (color != NULL);
if (gimp_rgba_distance (&area->color, color) < 0.000001)
return;
area->color = *color;
area->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (area));
g_object_notify (G_OBJECT (area), "color");
g_signal_emit (area, gimp_color_area_signals[COLOR_CHANGED], 0);
}
/**
* gimp_color_area_get_color:
* @area: Pointer to a #GimpColorArea.
* @color: Pointer to a #GimpRGB struct that is used to return the color.
*
* Retrieves the current color of the @area.
**/
void
gimp_color_area_get_color (GimpColorArea *area,
GimpRGB *color)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
g_return_if_fail (color != NULL);
*color = area->color;
}
/**
* gimp_color_area_has_alpha:
* @area: Pointer to a #GimpColorArea.
*
* Checks whether the @area shows transparency information. This is determined
* via the @area's #GimpColorAreaType.
*
* Returns: %TRUE if @area shows transparency information, %FALSE otherwise.
**/
gboolean
gimp_color_area_has_alpha (GimpColorArea *area)
{
g_return_val_if_fail (GIMP_IS_COLOR_AREA (area), FALSE);
return area->type != GIMP_COLOR_AREA_FLAT;
}
/**
* gimp_color_area_set_type:
* @area: Pointer to a #GimpColorArea.
* @type: A #GimpColorAreaType.
*
* Allows to change the type of @area. The #GimpColorAreaType determines
* whether the widget shows transparency information and chooses the size of
* the checkerboard used to do that.
**/
void
gimp_color_area_set_type (GimpColorArea *area,
GimpColorAreaType type)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
if (area->type != type)
{
area->type = type;
area->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (area));
g_object_notify (G_OBJECT (area), "type");
}
}
/**
* gimp_color_area_set_draw_border:
* @area: Pointer to a #GimpColorArea.
* @draw_border: whether to draw a border or not
*
* The @area can draw a thin border in the foreground color around
* itself. This function allows to toggle this behaviour on and
* off. The default is not draw a border.
**/
void
gimp_color_area_set_draw_border (GimpColorArea *area,
gboolean draw_border)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
draw_border = draw_border ? TRUE : FALSE;
if (area->draw_border != draw_border)
{
area->draw_border = draw_border;
gtk_widget_queue_draw (GTK_WIDGET (area));
g_object_notify (G_OBJECT (area), "draw-border");
}
}
static void
gimp_color_area_render_buf (GtkWidget *widget,
gboolean insensitive,
GimpColorAreaType type,
guchar *buf,
guint width,
guint height,
guint rowstride,
GimpRGB *color)
{
GtkStyle *style = gtk_widget_get_style (widget);
guint x, y;
guint check_size = 0;
guchar light[3];
guchar dark[3];
guchar opaque[3];
guchar insens[3];
guchar *p;
gdouble frac;
switch (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;
}
gimp_rgb_get_uchar (color, opaque, opaque + 1, opaque + 2);
insens[0] = style->bg[GTK_STATE_INSENSITIVE].red >> 8;
insens[1] = style->bg[GTK_STATE_INSENSITIVE].green >> 8;
insens[2] = style->bg[GTK_STATE_INSENSITIVE].blue >> 8;
if (insensitive || check_size == 0 || color->a == 1.0)
{
for (y = 0; y < height; y++)
{
p = buf + y * rowstride;
for (x = 0; x < width; x++)
{
if (insensitive && ((x + y) % 2))
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
insens[0],
insens[1],
insens[2]);
}
else
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
opaque[0],
opaque[1],
opaque[2]);
}
p += 4;
}
}
return;
}
light[0] = (GIMP_CHECK_LIGHT +
(color->r - GIMP_CHECK_LIGHT) * color->a) * 255.999;
light[1] = (GIMP_CHECK_LIGHT +
(color->g - GIMP_CHECK_LIGHT) * color->a) * 255.999;
light[2] = (GIMP_CHECK_LIGHT +
(color->b - GIMP_CHECK_LIGHT) * color->a) * 255.999;
dark[0] = (GIMP_CHECK_DARK +
(color->r - GIMP_CHECK_DARK) * color->a) * 255.999;
dark[1] = (GIMP_CHECK_DARK +
(color->g - GIMP_CHECK_DARK) * color->a) * 255.999;
dark[2] = (GIMP_CHECK_DARK +
(color->b - GIMP_CHECK_DARK) * color->a) * 255.999;
for (y = 0; y < height; y++)
{
p = buf + y * rowstride;
for (x = 0; x < width; x++)
{
if ((width - x) * height > y * width)
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
opaque[0],
opaque[1],
opaque[2]);
p += 4;
continue;
}
frac = y - (gdouble) ((width - x) * height) / (gdouble) width;
if (((x / check_size) ^ (y / check_size)) & 1)
{
if ((gint) frac)
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
light[0],
light[1],
light[2]);
}
else
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
((gdouble) light[0] * frac +
(gdouble) opaque[0] * (1.0 - frac)),
((gdouble) light[1] * frac +
(gdouble) opaque[1] * (1.0 - frac)),
((gdouble) light[2] * frac +
(gdouble) opaque[2] * (1.0 - frac)));
}
}
else
{
if ((gint) frac)
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
dark[0],
dark[1],
dark[2]);
}
else
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
((gdouble) dark[0] * frac +
(gdouble) opaque[0] * (1.0 - frac)),
((gdouble) dark[1] * frac +
(gdouble) opaque[1] * (1.0 - frac)),
((gdouble) dark[2] * frac +
(gdouble) opaque[2] * (1.0 - frac)));
}
}
p += 4;
}
}
}
static void
gimp_color_area_render (GimpColorArea *area)
{
if (! area->buf)
return;
gimp_color_area_render_buf (GTK_WIDGET (area),
! gtk_widget_is_sensitive (GTK_WIDGET (area)),
area->type,
area->buf,
area->width, area->height, area->rowstride,
&area->color);
area->needs_render = 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_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
gtk_window_set_screen (GTK_WINDOW (window), gtk_widget_get_screen (widget));
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 *area = GIMP_COLOR_AREA (widget);
const guint16 *vals;
GimpRGB color;
if (gtk_selection_data_get_length (selection_data) != 8 ||
gtk_selection_data_get_format (selection_data) != 16)
{
g_warning ("%s: received invalid color data", G_STRFUNC);
return;
}
vals = (const guint16 *) gtk_selection_data_get_data (selection_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 (area, &color);
}
static void
gimp_color_area_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time)
{
GimpColorArea *area = GIMP_COLOR_AREA (widget);
guint16 vals[4];
vals[0] = area->color.r * 0xffff;
vals[1] = area->color.g * 0xffff;
vals[2] = area->color.b * 0xffff;
if (area->type == GIMP_COLOR_AREA_FLAT)
vals[3] = 0xffff;
else
vals[3] = area->color.a * 0xffff;
gtk_selection_data_set (selection_data,
gdk_atom_intern ("application/x-color", FALSE),
16, (guchar *) vals, 8);
}
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