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Gimp/libgimpwidgets/gimpcolorarea.c
Jehan c558e41517 libgimpwidgets: update color area correctly when updating color. 
Since we don't necessarily re-render the color area when the color
change, let's store the actually rendered color, additionally to the
supposedly rendered color. Otherwise when changing the color by very
small increments, small enough that the color is always perceptually
identical to the previous color, we never re-render the widget, even
when the rendered color is now quite different. Indeed the "identical
color" algorithm, based on CIE2000 distance, is not transitive.

Additionally I do not check for perceptual identity in
GimpColorSelection anymore, because we also check for this in the
GimpColorArea. Better always having the right color set in the area.

This was raised in #11339 (even though the initial issue was about the
hexadecimal field).
2025-11-21 19:33:09 +01:00

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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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpconfig/gimpconfig.h"
#include "gimpwidgetstypes.h"
#include "gimpcairo-utils.h"
#include "gimpcolorarea.h"
#include "gimpwidgetsutils.h"
#include "gimpwidgets-private.h"
/**
* SECTION: gimpcolorarea
* @title: GimpColorArea
* @short_description: Displays a [class@Gegl.Color], optionally with
* alpha-channel.
*
* Displays a [class@Gegl.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
};
struct _GimpColorArea
{
GtkDrawingArea parent_instance;
GimpColorConfig *config;
GimpColorTransform *transform;
guchar *buf;
guint width;
guint height;
guint rowstride;
GimpColorAreaType type;
GeglColor *color;
GeglColor *rendered;
guint draw_border : 1;
guint needs_render : 1;
gboolean out_of_gamut;
};
static void gimp_color_area_dispose (GObject *object);
static void gimp_color_area_finalize (GObject *object);
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_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_color_area_draw (GtkWidget *widget,
cairo_t *cr);
static void gimp_color_area_render_buf (GtkWidget *widget,
GimpColorAreaType type,
guchar *buf,
guint width,
guint height,
guint rowstride,
GeglColor *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);
static void gimp_color_area_create_transform (GimpColorArea *area);
static void gimp_color_area_destroy_transform (GimpColorArea *area);
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-geglcolor", 0 };
static void
gimp_color_area_class_init (GimpColorAreaClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
gimp_color_area_signals[COLOR_CHANGED] =
g_signal_new ("color-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
object_class->dispose = gimp_color_area_dispose;
object_class->finalize = gimp_color_area_finalize;
object_class->get_property = gimp_color_area_get_property;
object_class->set_property = gimp_color_area_set_property;
widget_class->size_allocate = gimp_color_area_size_allocate;
widget_class->draw = gimp_color_area_draw;
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;
babl_init ();
/**
* GimpColorArea:color:
*
* The color displayed in the color area.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_COLOR,
gimp_param_spec_color_from_string ("color",
"Color",
"The displayed color",
TRUE, "black",
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
/**
* GimpColorArea:type:
*
* The type of the color area.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_TYPE,
g_param_spec_enum ("type",
"Type",
"The type of the color area",
GIMP_TYPE_COLOR_AREA_TYPE,
GIMP_COLOR_AREA_FLAT,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
/**
* GimpColorArea:drag-type:
*
* The modifier mask that should trigger drags.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_DRAG_MASK,
g_param_spec_flags ("drag-mask",
"Drag Mask",
"The modifier mask that triggers dragging the color",
GDK_TYPE_MODIFIER_TYPE,
0,
GIMP_PARAM_WRITABLE));
/**
* GimpColorArea:draw-border:
*
* Whether to draw a thin border in the foreground color around the area.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_DRAW_BORDER,
g_param_spec_boolean ("draw-border",
"Draw Border",
"Whether to draw a thin border in the foreground color around the area",
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;
area->color = gegl_color_new ("black");
area->rendered = NULL;
gtk_drag_dest_set (GTK_WIDGET (area),
GTK_DEST_DEFAULT_HIGHLIGHT |
GTK_DEST_DEFAULT_MOTION |
GTK_DEST_DEFAULT_DROP,
&target, 1,
GDK_ACTION_COPY);
gimp_widget_track_monitor (GTK_WIDGET (area),
G_CALLBACK (gimp_color_area_destroy_transform),
NULL, NULL);
}
static void
gimp_color_area_dispose (GObject *object)
{
GimpColorArea *area = GIMP_COLOR_AREA (object);
gimp_color_area_set_color_config (area, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_color_area_finalize (GObject *object)
{
GimpColorArea *area = GIMP_COLOR_AREA (object);
g_clear_pointer (&area->buf, g_free);
g_clear_object (&area->color);
g_clear_object (&area->rendered);
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_object (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_object (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);
else
gtk_drag_source_unset (GTK_WIDGET (area));
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);
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 gboolean
gimp_color_area_draw (GtkWidget *widget,
cairo_t *cr)
{
GimpColorArea *area = GIMP_COLOR_AREA (widget);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
cairo_surface_t *buffer;
gboolean oog = area->out_of_gamut;
if (! area->buf)
return FALSE;
if (area->needs_render)
gimp_color_area_render (area);
if (! area->transform)
gimp_color_area_create_transform (area);
if (area->transform)
{
const Babl *format = babl_format ("cairo-RGB24");
guchar *buf = g_new (guchar, area->rowstride * area->height);
guchar *src = area->buf;
guchar *dest = buf;
guint i;
for (i = 0; i < area->height; i++)
{
gimp_color_transform_process_pixels (area->transform,
format, src,
format, dest,
area->width);
src += area->rowstride;
dest += area->rowstride;
}
buffer = cairo_image_surface_create_for_data (buf,
CAIRO_FORMAT_RGB24,
area->width,
area->height,
area->rowstride);
cairo_surface_set_user_data (buffer, NULL,
buf, (cairo_destroy_func_t) g_free);
}
else
{
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);
if (! gtk_widget_is_sensitive (widget))
{
static cairo_pattern_t *pattern = NULL;
if (! pattern)
{
static const guchar stipple[] = { 0, 255, 0, 0,
255, 0, 0, 0 };
cairo_surface_t *surface;
gint stride;
stride = cairo_format_stride_for_width (CAIRO_FORMAT_A8, 2);
surface = cairo_image_surface_create_for_data ((guchar *) stipple,
CAIRO_FORMAT_A8,
2, 2, stride);
pattern = cairo_pattern_create_for_surface (surface);
cairo_surface_destroy (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
}
cairo_mask (cr, pattern);
}
else
{
cairo_paint (cr);
}
if (area->config && ! oog)
oog = gimp_color_is_out_of_self_gamut (area->color);
if (area->config && oog)
{
GeglColor *oog_color;
gint side = MIN (area->width, area->height) * 2 / 3;
cairo_move_to (cr, area->width, 0);
cairo_line_to (cr, area->width - side, 0);
cairo_line_to (cr, area->width, side);
cairo_line_to (cr, area->width, 0);
oog_color = gimp_color_config_get_out_of_gamut_color (area->config);
gimp_cairo_set_source_color (cr, oog_color, area->config, FALSE, widget);
cairo_fill (cr);
g_object_unref (oog_color);
}
if (area->draw_border)
{
GdkRGBA color;
cairo_set_line_width (cr, 1.0);
gtk_style_context_get_color (context, gtk_widget_get_state_flags (widget),
&color);
gdk_cairo_set_source_rgba (cr, &color);
cairo_rectangle (cr, 0.5, 0.5, area->width - 1, area->height - 1);
cairo_stroke (cr);
}
return FALSE;
}
/**
* gimp_color_area_new:
* @color: A pointer to a [class@Gegl.Color].
* @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 (GeglColor *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 [class@Gegl.Color] that defines the new color.
*
* Sets @area to a different @color.
**/
void
gimp_color_area_set_color (GimpColorArea *area,
GeglColor *color)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
g_return_if_fail (GEGL_IS_COLOR (color));
if (! area->rendered ||
! gimp_color_is_perceptually_identical (area->rendered, color))
{
area->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (area));
}
color = gegl_color_duplicate (color);
g_clear_object (&area->color);
area->color = color;
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.
*
* Retrieves the current color of the @area.
*
* Returns: (transfer full): a copy of the [class@Gegl.Color] displayed in
* @area.
**/
GeglColor *
gimp_color_area_get_color (GimpColorArea *area)
{
g_return_val_if_fail (GIMP_IS_COLOR_AREA (area), NULL);
return gegl_color_duplicate (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.
*
* Changes 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_enable_drag:
* @area: A #GimpColorArea.
* @drag_mask: The bitmask of buttons that can start the drag.
*
* Allows dragging the color displayed with buttons identified by
* @drag_mask. The drag supports targets of type "application/x-geglcolor".
*
* Note that setting a @drag_mask of 0 disables the drag ability.
**/
void
gimp_color_area_enable_drag (GimpColorArea *area,
GdkModifierType drag_mask)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
g_object_set (area,
"drag-mask", drag_mask,
NULL);
}
/**
* 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 toggles this behavior 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");
}
}
/**
* gimp_color_area_set_out_of_gamut:
* @area: a #GimpColorArea widget.
* @out_of_gamut: whether to show an out-of-gamut indicator
*
* Sets the color area to render as an out-of-gamut color, i.e. with a
* small triangle on a corner using the color management out of gamut
* color (as per gimp_color_area_set_color_config()).
*
* By default, @area will render as out-of-gamut for any RGB color with
* a channel out of the [0; 1] range. This function allows to consider
* more colors out of gamut (for instance non-gray colors on a grayscale
* image, or colors absent of palettes in indexed images, etc.)
*
* Since: 2.10.10
*/
void
gimp_color_area_set_out_of_gamut (GimpColorArea *area,
gboolean out_of_gamut)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
if (area->out_of_gamut != out_of_gamut)
{
area->out_of_gamut = out_of_gamut;
gtk_widget_queue_draw (GTK_WIDGET (area));
}
}
/**
* gimp_color_area_set_color_config:
* @area: a #GimpColorArea widget.
* @config: a #GimpColorConfig object.
*
* Sets the color management configuration to use with this color area.
*
* Since: 2.10
*/
void
gimp_color_area_set_color_config (GimpColorArea *area,
GimpColorConfig *config)
{
g_return_if_fail (GIMP_IS_COLOR_AREA (area));
g_return_if_fail (config == NULL || GIMP_IS_COLOR_CONFIG (config));
if (config != area->config)
{
if (area->config)
{
g_signal_handlers_disconnect_by_func (area->config,
gimp_color_area_destroy_transform,
area);
gimp_color_area_destroy_transform (area);
}
g_set_object (&area->config, config);
if (area->config)
{
g_signal_connect_swapped (area->config, "notify",
G_CALLBACK (gimp_color_area_destroy_transform),
area);
}
}
}
/* private functions */
static void
gimp_color_area_render_buf (GtkWidget *widget,
GimpColorAreaType type,
guchar *buf,
guint width,
guint height,
guint rowstride,
GeglColor *color)
{
GimpColorArea *area = GIMP_COLOR_AREA (widget);
const Babl *render_space;
guint x, y;
guint check_size = 0;
guchar light[3];
guchar dark[3];
gdouble opaque_d[4];
guchar opaque[4];
guchar *p;
gdouble frac;
g_clear_object (&area->rendered);
area->rendered = gegl_color_duplicate (color);
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;
}
render_space = gimp_widget_get_render_space (widget, area->config);
gegl_color_get_pixel (color, babl_format_with_space ("R'G'B'A u8", render_space), opaque);
gegl_color_get_pixel (color, babl_format_with_space ("R'G'B'A double", render_space), opaque_d);
if (check_size == 0 || opaque_d[3] == 1.0)
{
for (y = 0; y < height; y++)
{
p = buf + y * rowstride;
for (x = 0; x < width; x++)
{
GIMP_CAIRO_RGB24_SET_PIXEL (p,
opaque[0],
opaque[1],
opaque[2]);
p += 4;
}
}
return;
}
light[0] = (GIMP_CHECK_LIGHT +
(opaque_d[0] - GIMP_CHECK_LIGHT) * opaque_d[3]) * 255.999;
light[1] = (GIMP_CHECK_LIGHT +
(opaque_d[1] - GIMP_CHECK_LIGHT) * opaque_d[3]) * 255.999;
light[2] = (GIMP_CHECK_LIGHT +
(opaque_d[2] - GIMP_CHECK_LIGHT) * opaque_d[3]) * 255.999;
dark[0] = (GIMP_CHECK_DARK +
(opaque_d[0] - GIMP_CHECK_DARK) * opaque_d[3]) * 255.999;
dark[1] = (GIMP_CHECK_DARK +
(opaque_d[1] - GIMP_CHECK_DARK) * opaque_d[3]) * 255.999;
dark[2] = (GIMP_CHECK_DARK +
(opaque_d[2] - GIMP_CHECK_DARK) * opaque_d[3]) * 255.999;
/* TODO: should we get float data and render in CAIRO_FORMAT_RGBA128F rather
* than in CAIRO_FORMAT_RGB24?
*/
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),
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)
{
GimpColorArea *area = GIMP_COLOR_AREA (widget);
GeglColor *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);
color = gimp_color_area_get_color (GIMP_COLOR_AREA (widget));
color_area = gimp_color_area_new (color, area->type, 0);
g_object_unref (color);
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);
GeglColor *color;
const guchar *data;
gint data_length;
const Babl *format;
const gchar *encoding;
gint encoding_length;
const guchar *pixel;
gint pixel_length;
const guint8 *profile_data = NULL;
int profile_length = 0;
if (selection_data == NULL)
{
g_warning ("%s: received invalid color data", G_STRFUNC);
return;
}
data = gtk_selection_data_get_data (selection_data);
data_length = gtk_selection_data_get_length (selection_data);
encoding = (const gchar *) data;
encoding_length = strlen (encoding) + 1;
if (! babl_format_exists ((const char *) data))
{
g_critical ("%s: received invalid color format: \"%s\"!", G_STRFUNC, encoding);
return;
}
format = babl_format (encoding);
pixel_length = babl_format_get_bytes_per_pixel (format);
if (data_length < encoding_length + pixel_length)
{
g_critical ("%s: received invalid color data of %d bytes "
"(expected: %d bytes or more)!",
G_STRFUNC, data_length, encoding_length + pixel_length);
return;
}
pixel = data + encoding_length;
profile_length = data_length - encoding_length - pixel_length;
if (profile_length > 0)
{
GimpColorProfile *profile;
GError *error = NULL;
profile_data = pixel + pixel_length;
profile = gimp_color_profile_new_from_icc_profile (profile_data, profile_length, &error);
if (profile)
{
const Babl *space;
space = gimp_color_profile_get_space (profile,
GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
&error);
if (space)
{
format = babl_format_with_space (encoding, space);
}
else
{
g_warning ("%s: failed to create Babl space for profile: %s",
G_STRFUNC, error->message);
g_clear_error (&error);
}
g_object_unref (profile);
}
else
{
g_warning ("%s: received invalid profile data of %d bytes: %s",
G_STRFUNC, profile_length, error->message);
g_clear_error (&error);
}
}
color = gegl_color_new (NULL);
gegl_color_set_pixel (color, format, pixel);
gimp_color_area_set_color (area, color);
g_object_unref (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);
const Babl *format;
const gchar *encoding;
gint encoding_length;
guchar pixel[40];
gint pixel_length;
guint8 *profile_data = NULL;
int profile_length = 0;
guchar *data;
gint data_length;
g_return_if_fail (selection_data != NULL);
g_return_if_fail (area->color != NULL);
format = gegl_color_get_format (area->color);
encoding = babl_format_get_encoding (format);
encoding_length = strlen (encoding) + 1;
pixel_length = babl_format_get_bytes_per_pixel (format);
gegl_color_get_pixel (area->color, format, pixel);
if (babl_format_get_space (format) != babl_space ("sRGB"))
profile_data = (guint8 *) babl_space_get_icc (babl_format_get_space (format),
&profile_length);
data_length = encoding_length + pixel_length + profile_length;
data = g_malloc0 (data_length);
memcpy (data, encoding, encoding_length);
memcpy (data + encoding_length, pixel, pixel_length);
if (profile_length > 0)
memcpy (data + encoding_length + pixel_length, profile_data, profile_length);
gtk_selection_data_set (selection_data,
gtk_selection_data_get_target (selection_data),
8, (const guchar *) data, data_length);
}
static void
gimp_color_area_create_transform (GimpColorArea *area)
{
if (area->config)
{
static GimpColorProfile *profile = NULL;
const Babl *format = babl_format ("cairo-RGB24");
if (G_UNLIKELY (! profile))
profile = gimp_color_profile_new_rgb_srgb ();
area->transform = gimp_widget_get_color_transform (GTK_WIDGET (area),
area->config,
profile,
format,
format,
NULL,
GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
FALSE);
}
}
static void
gimp_color_area_destroy_transform (GimpColorArea *area)
{
g_clear_object (&area->transform);
gtk_widget_queue_draw (GTK_WIDGET (area));
}
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