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gimp/app/gimpdnd.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "gimage.h"
#include "gimpdnd.h"
#include "gimprc.h"
/****************************/
/* drawable dnd functions */
/****************************/
#define GRAD_CHECK_SIZE_SM 4
#define GRAD_CHECK_DARK (1.0 / 3.0)
#define GRAD_CHECK_LIGHT (2.0 / 3.0)
/* Good idea for size to be <= small preview size in LCP dialog.
* that way we get good cache hits.
*/
#define DRAG_IMAGE_SZ 32
void
gimp_dnd_set_drawable_preview_icon (GtkWidget *widget,
GdkDragContext *context,
GimpDrawable *drawable,
GdkGC *gc)
{
GdkPixmap *drag_pixmap;
GImage *gimage;
TempBuf *tmpbuf;
gint bpp;
gint x, y;
guchar *src;
gdouble r, g, b, a;
gdouble c0, c1;
guchar *p0, *p1, *even, *odd;
gint width;
gint height;
gdouble ratio;
gint offx, offy;
if (! preview_size)
return;
gimage = gimp_drawable_gimage (drawable);
if (gimage->width > gimage->height)
ratio = (gdouble) DRAG_IMAGE_SZ / (gdouble) gimage->width;
else
ratio = (gdouble) DRAG_IMAGE_SZ / (gdouble) gimage->height;
width = (gint) (ratio * gimage->width);
height = (gint) (ratio * gimage->height);
if (width < 1)
width = 1;
if (height < 1)
height = 1;
gimp_drawable_offsets (drawable, &offx, &offy);
offx = (int) (ratio * offx);
offy = (int) (ratio * offy);
drag_pixmap = gdk_pixmap_new (widget->window,
width+2, height+2, -1);
gdk_draw_rectangle (drag_pixmap,
/* Is this always valid??? */
widget->style->bg_gc[GTK_STATE_NORMAL],
TRUE,
0, 0,
width + 2,
height + 2);
gdk_draw_rectangle (drag_pixmap,
gc,
FALSE,
0, 0,
width + 1,
height + 1);
/* readjust for actual layer size */
width = (gint) (ratio * gimp_drawable_width (drawable));
height = (gint) (ratio * gimp_drawable_height (drawable));
if (width < 1)
width = 1;
if (height < 1)
height = 1;
if (GIMP_IS_LAYER (drawable))
{
tmpbuf = layer_preview (GIMP_LAYER (drawable), width, height);
}
else if (GIMP_IS_LAYER_MASK (drawable))
{
tmpbuf =
layer_mask_preview (layer_mask_get_layer (GIMP_LAYER_MASK (drawable)),
width, height);
}
else if (GIMP_IS_CHANNEL (drawable))
{
tmpbuf = channel_preview (GIMP_CHANNEL (drawable), width, height);
}
else
{
gdk_pixmap_unref (drag_pixmap);
return;
}
bpp = tmpbuf->bytes;
/* Draw the thumbnail with checks */
src = temp_buf_data (tmpbuf);
even = g_malloc (width * 3);
odd = g_malloc (width * 3);
for (y = 0; y < height; y++)
{
p0 = even;
p1 = odd;
for (x = 0; x < width; x++)
{
if (bpp == 4)
{
r = ((gdouble) src[x*4+0]) / 255.0;
g = ((gdouble) src[x*4+1]) / 255.0;
b = ((gdouble) src[x*4+2]) / 255.0;
a = ((gdouble) src[x*4+3]) / 255.0;
}
else if (bpp == 3)
{
r = ((gdouble) src[x*3+0]) / 255.0;
g = ((gdouble) src[x*3+1]) / 255.0;
b = ((gdouble) src[x*3+2]) / 255.0;
a = 1.0;
}
else
{
r = ((gdouble) src[x*bpp+0]) / 255.0;
g = b = r;
if (bpp == 2)
a = ((gdouble) src[x*bpp+1]) / 255.0;
else
a = 1.0;
}
if ((x / GRAD_CHECK_SIZE_SM) & 1)
{
c0 = GRAD_CHECK_LIGHT;
c1 = GRAD_CHECK_DARK;
}
else
{
c0 = GRAD_CHECK_DARK;
c1 = GRAD_CHECK_LIGHT;
}
*p0++ = (c0 + (r - c0) * a) * 255.0;
*p0++ = (c0 + (g - c0) * a) * 255.0;
*p0++ = (c0 + (b - c0) * a) * 255.0;
*p1++ = (c1 + (r - c1) * a) * 255.0;
*p1++ = (c1 + (g - c1) * a) * 255.0;
*p1++ = (c1 + (b - c1) * a) * 255.0;
}
if ((y / GRAD_CHECK_SIZE_SM) & 1)
{
gdk_draw_rgb_image (drag_pixmap, gc,
1+offx, y+1+offy,
width,
1,
GDK_RGB_DITHER_NORMAL,
(guchar *) odd,
3);
}
else
{
gdk_draw_rgb_image (drag_pixmap, gc,
1+offx, y+1+offy,
width,
1,
GDK_RGB_DITHER_NORMAL,
(guchar *) even,
3);
}
src += width * bpp;
}
g_free (even);
g_free (odd);
gtk_drag_set_icon_pixmap (context,
gtk_widget_get_colormap (widget),
drag_pixmap,
NULL,
-8, -8);
gdk_pixmap_unref (drag_pixmap);
}
/*************************/
/* color dnd functions */
/*************************/
static void
gimp_dnd_color_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkWidget *window;
GdkColor bg;
guchar r, g, b;
GimpDndGetColorFunc get_color_func;
get_color_func =
(GimpDndGetColorFunc) gtk_object_get_data (GTK_OBJECT (widget),
"gimp_dnd_get_color_func");
if (! get_color_func)
return;
window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE);
gtk_widget_set_usize (window, 48, 32);
gtk_widget_realize (window);
gtk_object_set_data_full (GTK_OBJECT (widget),
"gimp-color-drag-window",
window,
(GtkDestroyNotify) gtk_widget_destroy);
(* get_color_func) (data, &r, &g, &b);
bg.red = 0xff * r;
bg.green = 0xff * g;
bg.blue = 0xff * b;
gdk_color_alloc (gtk_widget_get_colormap (window), &bg);
gdk_window_set_background (window->window, &bg);
gtk_drag_set_icon_widget (context, window, -2, -2);
}
static void
gimp_dnd_color_drag_end (GtkWidget *widget,
GdkDragContext *context)
{
gtk_object_set_data (GTK_OBJECT (widget),
"gimp-color-drag-window", NULL);
}
static void
gimp_dnd_color_drag_handle (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
gpointer data)
{
guint16 vals[4];
guchar r, g, b;
GimpDndGetColorFunc get_color_func;
get_color_func =
(GimpDndGetColorFunc) gtk_object_get_data (GTK_OBJECT (widget),
"gimp_dnd_get_color_func");
if (! get_color_func)
return;
(* get_color_func) (data, &r, &g, &b);
vals[0] = r * 0xff;
vals[1] = g * 0xff;
vals[2] = b * 0xff;
vals[3] = 0xffff;
gtk_selection_data_set (selection_data,
gdk_atom_intern ("application/x-color", FALSE),
16, (guchar *) vals, 8);
}
static void
gimp_dnd_color_drop_handle (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint time,
gpointer data)
{
guint16 *vals;
guchar r, g, b;
GimpDndSetColorFunc set_color_func;
set_color_func =
(GimpDndSetColorFunc) gtk_object_get_data (GTK_OBJECT (widget),
"gimp_dnd_set_color_func");
if (! set_color_func)
return;
if (selection_data->length < 0)
return;
if ((selection_data->format != 16) ||
(selection_data->length != 8))
{
g_warning ("Received invalid color data\n");
return;
}
vals = (guint16 *) selection_data->data;
r = vals[0] / 0xff;
g = vals[1] / 0xff;
b = vals[2] / 0xff;
(* set_color_func) (data, r, g, b);
}
void
gimp_dnd_color_source_set (GtkWidget *widget,
GimpDndGetColorFunc get_color_func,
gpointer data)
{
gtk_signal_connect (GTK_OBJECT (widget), "drag_begin",
GTK_SIGNAL_FUNC (gimp_dnd_color_drag_begin),
data);
gtk_signal_connect (GTK_OBJECT (widget), "drag_end",
GTK_SIGNAL_FUNC (gimp_dnd_color_drag_end),
data);
gtk_signal_connect (GTK_OBJECT (widget), "drag_data_get",
GTK_SIGNAL_FUNC (gimp_dnd_color_drag_handle),
data);
gtk_object_set_data (GTK_OBJECT (widget), "gimp_dnd_get_color_func",
(gpointer) get_color_func);
}
void
gimp_dnd_color_dest_set (GtkWidget *widget,
GimpDndSetColorFunc set_color_func,
gpointer data)
{
gtk_signal_connect (GTK_OBJECT (widget), "drag_data_received",
GTK_SIGNAL_FUNC (gimp_dnd_color_drop_handle),
data);
gtk_object_set_data (GTK_OBJECT (widget), "gimp_dnd_set_color_func",
(gpointer) set_color_func);
}
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