dnrops
/
gimp
mirror of https://github.com/GNOME/gimp.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
gimp/modules/colorsel_water.c

659 lines
16 KiB
C
Raw Blame History

/* Watercolor color_select_module, Raph Levien <raph@acm.org>, February 1998
*
* Ported to loadable color-selector interface, May 1999
* by Sven Neumann <sven@gimp.org>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* #define VERBOSE 1 */
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <gtk/gtk.h>
#include <libgimp/color_selector.h>
#include <libgimp/gimpmodule.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
/* prototypes */
static GtkWidget * colorsel_water_new (int, int, int,
GimpColorSelector_Callback,
void *,
void **);
static void colorsel_water_free (void *);
static void colorsel_water_setcolor (void *, int, int, int, int);
static void colorsel_water_update ();
/* local methods */
static GimpColorSelectorMethods methods =
{
colorsel_water_new,
colorsel_water_free,
colorsel_water_setcolor
};
static GimpModuleInfo info = {
NULL,
"Watercolor style color selector as a pluggable module",
"Raph Levien <raph@acm.org>, Sven Neumann <sven@gimp.org>",
"v0.3",
"(c) 1998-1999, released under the GPL",
"May, 10 1999"
};
/*************************************************************/
/* globaly exported init function */
G_MODULE_EXPORT GimpModuleStatus
module_init (GimpModuleInfo **inforet)
{
GimpColorSelectorID id;
id = gimp_color_selector_register ("Watercolor", &methods);
if (id)
{
info.shutdown_data = id;
*inforet = &info;
return GIMP_MODULE_OK;
}
else
{
return GIMP_MODULE_UNLOAD;
}
}
G_MODULE_EXPORT void
module_unload (void *shutdown_data,
void (*completed_cb)(void *),
void *completed_data)
{
gimp_color_selector_unregister (shutdown_data, completed_cb, completed_data);
}
/* definitions and variables */
#define N_BUCKETS 10
#define LAST_BUCKET (N_BUCKETS) /* bucket number 0 is current color */
#define IMAGE_SIZE 200
#define BUCKET_SIZE 20
#define PREVIEW_SIZE 40
typedef struct {
GimpColorSelector_Callback callback;
void *data;
} ColorselWater;
static gdouble bucket[N_BUCKETS + 1][3];
static GtkWidget *color_preview[N_BUCKETS + 1];
static gdouble last_x, last_y, last_pressure;
static gfloat pressure_adjust = 1.0;
static guint32 motion_time;
static gint button_state;
static ColorselWater *coldata;
static void
set_bucket (gint i, gdouble r, gdouble g, gdouble b)
{
if (i >= 0 && i <= N_BUCKETS)
{
bucket[i][0] = r;
bucket[i][1] = g;
bucket[i][2] = b;
}
}
static gdouble
calc (gdouble x, gdouble y, gdouble angle)
{
gdouble s, c;
s = 1.6 * sin (angle * M_PI / 180) * 256.0 / IMAGE_SIZE;
c = 1.6 * cos (angle * M_PI / 180) * 256.0 / IMAGE_SIZE;
return 128 + (x - (IMAGE_SIZE >> 1)) * c - (y - (IMAGE_SIZE >> 1)) * s;
}
static guchar
bucket_to_byte (gdouble val)
{
return CLAMP ((gint)(val * 280 - 25), 0, 255);
}
static void
draw_bucket (gint i)
{
guchar *buf;
gint x, y;
gint width;
gint height;
guchar r, g, b;
g_return_if_fail (i >= 0 && i <= N_BUCKETS);
#ifdef VERBOSE
g_print ("draw_bucket %d\n", i);
#endif
width = (i == 0 ? PREVIEW_SIZE : BUCKET_SIZE);
height = width;
buf = g_new (guchar, 3*width);
r = bucket_to_byte (bucket[i][0]);
g = bucket_to_byte (bucket[i][1]);
b = bucket_to_byte (bucket[i][2]);
for (x = 0; x < width; x++)
{
buf[x * 3] = r;
buf[x * 3 + 1] = g;
buf[x * 3 + 2] = b;
}
for (y = 0; y < height; y++)
gtk_preview_draw_row (GTK_PREVIEW (color_preview[i]), buf, 0, y, width);
gtk_widget_draw (color_preview[i], NULL);
g_free (buf);
}
static void
draw_all_buckets ()
{
gint i;
#ifdef VERBOSE
g_print ("drawing all buckets\n");
#endif
for (i = 1; i <= N_BUCKETS; i++)
draw_bucket (i);
}
static void
pick_up_bucket_callback (GtkWidget *widget,
gpointer data)
{
guint i = GPOINTER_TO_UINT (data);
#ifdef VERBOSE
g_print ("pick up bucket %d\n", i);
#endif
if (i > 0 && i <= N_BUCKETS)
{
bucket[0][0] = bucket[i][0];
bucket[0][1] = bucket[i][1];
bucket[0][2] = bucket[i][2];
colorsel_water_update ();
}
}
static void
shift_buckets ()
{
gint i;
#ifdef VERBOSE
g_print ("shift\n");
#endif
/* to avoid duplication, do nothing if cuurent bucket is already present */
for (i = 1; i <= N_BUCKETS; i++)
{
if (bucket[i][0] == bucket[0][0] &&
bucket[i][1] == bucket[0][1] &&
bucket[i][2] == bucket[0][2])
return;
}
/* don't bother storing pure white in buckets */
if (bucket[0][0] == 1.0 &&
bucket[0][1] == 1.0 &&
bucket[0][2] == 1.0)
return;
/* shift all buckets one to the right */
for (i = N_BUCKETS; i > 0; i--)
{
bucket[i][0] = bucket[i-1][0];
bucket[i][1] = bucket[i-1][1];
bucket[i][2] = bucket[i-1][2];
}
}
/* Initialize the preview */
static void
select_area_draw (GtkWidget *preview)
{
guchar buf[3 * IMAGE_SIZE];
gint x, y;
gdouble r, g, b;
gdouble dr, dg, db;
for (y = 0; y < IMAGE_SIZE; y++)
{
r = calc (0, y, 0);
g = calc (0, y, 120);
b = calc (0, y, 240);
dr = calc (1, y, 0) - r;
dg = calc (1, y, 120) - g;
db = calc (1, y, 240) - b;
for (x = 0; x < IMAGE_SIZE; x++)
{
buf[x * 3] = CLAMP ((gint)r, 0, 255);
buf[x * 3 + 1] = CLAMP ((gint)g, 0, 255);
buf[x * 3 + 2] = CLAMP ((gint)b, 0, 255);
r += dr;
g += dg;
b += db;
}
gtk_preview_draw_row (GTK_PREVIEW (preview), buf, 0, y, IMAGE_SIZE);
}
}
static void
add_pigment (gboolean erase, gdouble x, gdouble y, gdouble much)
{
gdouble r, g, b;
much *= (gdouble)pressure_adjust;
#ifdef VERBOSE
g_print ("x: %g, y: %g, much: %g\n", x, y, much);
#endif
if (erase)
{
bucket[0][0] = 1 - (1 - bucket[0][0]) * (1 - much);
bucket[0][1] = 1 - (1 - bucket[0][1]) * (1 - much);
bucket[0][2] = 1 - (1 - bucket[0][2]) * (1 - much);
}
else
{
r = calc (x, y, 0) / 255.0;
if (r < 0) r = 0;
if (r > 1) r = 1;
g = calc (x, y, 120) / 255.0;
if (g < 0) g = 0;
if (g > 1) g = 1;
b = calc (x, y, 240) / 255.0;
if (b < 0) b = 0;
if (b > 1) b = 1;
bucket[0][0] *= (1 - (1 - r) * much);
bucket[0][1] *= (1 - (1 - g) * much);
bucket[0][2] *= (1 - (1 - b) * much);
}
colorsel_water_update ();
}
static void
draw_brush (GtkWidget *widget, gboolean erase,
gdouble x, gdouble y, gdouble pressure)
{
gdouble much; /* how much pigment to mix in */
if (pressure < last_pressure)
last_pressure = pressure;
much = sqrt ((x - last_x) * (x - last_x) +
(y - last_y) * (y - last_y) +
1000 * (pressure - last_pressure) * (pressure - last_pressure));
much *= pressure * 0.05;
add_pigment (erase, x, y, much);
last_x = x;
last_y = y;
last_pressure = pressure;
}
static gint
button_press_event (GtkWidget *widget, GdkEventButton *event)
{
gboolean erase;
#ifdef VERBOSE
g_print ("button press\n");
#endif
last_x = event->x;
last_y = event->y;
last_pressure = event->pressure;
button_state |= 1 << event->button;
erase = (event->button != 1) ||
(event->source == GDK_SOURCE_ERASER);
add_pigment (erase, event->x, event->y, 0.05);
motion_time = event->time;
return FALSE;
}
static gint
button_release_event (GtkWidget *widget, GdkEventButton *event)
{
button_state &= ~(1 << event->button);
return TRUE;
}
static gint
motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
{
GdkTimeCoord *coords;
int nevents;
int i;
gboolean erase;
if (event->state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK | GDK_BUTTON4_MASK))
{
coords = gdk_input_motion_events (event->window, event->deviceid,
motion_time, event->time,
&nevents);
erase = (event->state &
(GDK_BUTTON2_MASK | GDK_BUTTON3_MASK | GDK_BUTTON4_MASK)) ||
(event->source == GDK_SOURCE_ERASER);
motion_time = event->time;
if (coords)
{
for (i=0; i<nevents; i++)
draw_brush (widget, erase, coords[i].x, coords[i].y,
coords[i].pressure);
g_free (coords);
}
else
{
if (event->is_hint)
gdk_input_window_get_pointer (event->window, event->deviceid,
NULL, NULL, NULL, NULL, NULL, NULL);
draw_brush (widget, erase, event->x, event->y,
event->pressure);
}
}
else
{
gdk_input_window_get_pointer (event->window, event->deviceid,
&event->x, &event->y,
NULL, NULL, NULL, NULL);
}
return TRUE;
}
static gint
proximity_out_event (GtkWidget *widget, GdkEventProximity *event)
{
#ifdef VERBOSE
g_print ("proximity out\n");
#endif /* VERBOSE */
return TRUE;
}
static void
new_color_callback (GtkWidget *widget, gpointer data)
{
#ifdef VERBOSE
g_print ("new color\n");
#endif
shift_buckets ();
/* current bucket becomes white */
bucket[0][0] = 1.0;
bucket[0][1] = 1.0;
bucket[0][2] = 1.0;
draw_all_buckets ();
colorsel_water_update ();
return;
}
static void
reset_color_callback (GtkWidget *widget, gpointer data)
{
#ifdef VERBOSE
g_print ("reset color\n");
#endif
/* current bucket becomes white */
bucket[0][0] = 1.0;
bucket[0][1] = 1.0;
bucket[0][2] = 1.0;
colorsel_water_update ();
return;
}
static void
pressure_adjust_update (GtkAdjustment *adj, gpointer data)
{
pressure_adjust = adj->value / 100;
}
/*************************************************************/
/* methods */
static GtkWidget*
colorsel_water_new (int r, int g, int b,
GimpColorSelector_Callback callback,
void *callback_data,
/* RETURNS: */
void **selector_data)
{
GtkWidget *preview;
GtkWidget *event_box;
GtkWidget *frame;
GtkWidget *hbox;
GtkWidget *hbox2;
GtkWidget *hbox3;
GtkWidget *vbox;
GtkWidget *vbox2;
GtkWidget *vbox3;
GtkWidget *table;
GtkWidget *button;
GtkWidget *bbox;
GtkWidget *label;
GtkObject *adj;
GtkWidget *scale;
guint i;
coldata = g_malloc (sizeof (ColorselWater));
coldata->callback = callback;
coldata->data = callback_data;
*selector_data = coldata;
vbox = gtk_vbox_new (FALSE, 0);
hbox = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, FALSE, 4);
/* the event box */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
event_box = gtk_event_box_new ();
gtk_container_add (GTK_CONTAINER (frame), event_box);
preview = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (preview), IMAGE_SIZE, IMAGE_SIZE);
gtk_container_add (GTK_CONTAINER (event_box), preview);
select_area_draw (preview);
/* Event signals */
gtk_signal_connect (GTK_OBJECT (event_box), "motion_notify_event",
(GtkSignalFunc) motion_notify_event, NULL);
gtk_signal_connect (GTK_OBJECT (event_box), "button_press_event",
(GtkSignalFunc) button_press_event, NULL);
gtk_signal_connect (GTK_OBJECT (event_box), "button_release_event",
(GtkSignalFunc) button_release_event, NULL);
gtk_signal_connect (GTK_OBJECT (event_box), "proximity_out_event",
(GtkSignalFunc) proximity_out_event, NULL);
gtk_widget_set_events (event_box, GDK_EXPOSURE_MASK
| GDK_LEAVE_NOTIFY_MASK
| GDK_BUTTON_PRESS_MASK
| GDK_KEY_PRESS_MASK
| GDK_POINTER_MOTION_MASK
| GDK_POINTER_MOTION_HINT_MASK
| GDK_PROXIMITY_OUT_MASK);
/* The following call enables tracking and processing of extension
events for the drawing area */
gtk_widget_set_extension_events (event_box, GDK_EXTENSION_EVENTS_ALL);
gtk_widget_grab_focus (event_box);
vbox2 = gtk_vbox_new (FALSE, 0);
gtk_box_pack_end (GTK_BOX (hbox), vbox2, TRUE, FALSE, 0);
hbox2 = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox2), hbox2, TRUE, FALSE, 4);
vbox3 = gtk_vbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (hbox2), vbox3, FALSE, FALSE, 4);
hbox3 = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox3), hbox3, FALSE, FALSE, 4);
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (hbox3), frame, TRUE, FALSE, 0);
color_preview[0] = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (color_preview[0]), PREVIEW_SIZE, PREVIEW_SIZE);
gtk_container_add (GTK_CONTAINER (frame), color_preview[0]);
bbox = gtk_vbutton_box_new ();
gtk_box_pack_end (GTK_BOX (hbox2), bbox, FALSE, FALSE, 0);
button = gtk_button_new_with_label ("New");
gtk_container_add (GTK_CONTAINER (bbox), button);
gtk_signal_connect (GTK_OBJECT (button), "pressed",
(GtkSignalFunc) new_color_callback,
NULL);
button = gtk_button_new_with_label ("Reset");
gtk_container_add (GTK_CONTAINER (bbox), button);
gtk_signal_connect (GTK_OBJECT (button), "pressed",
(GtkSignalFunc) reset_color_callback,
NULL);
frame = gtk_frame_new ("Color history");
gtk_box_pack_start (GTK_BOX (vbox2), frame, TRUE, FALSE, 0);
table = gtk_table_new (2, 5, TRUE);
gtk_container_set_border_width (GTK_CONTAINER (table), 2);
gtk_container_add (GTK_CONTAINER (frame), table);
for (i = 0; i < N_BUCKETS; i++)
{
button = gtk_button_new ();
gtk_signal_connect (GTK_OBJECT (button), "pressed",
GTK_SIGNAL_FUNC (pick_up_bucket_callback),
(gpointer) GUINT_TO_POINTER (i+1));
gtk_table_attach_defaults (GTK_TABLE (table),
button,
i % 5, (i % 5) + 1,
i / 5, (i/ 5) + 1);
color_preview[i+1] = gtk_preview_new (GTK_PREVIEW_COLOR);
gtk_preview_size (GTK_PREVIEW (color_preview[i+1]), BUCKET_SIZE, BUCKET_SIZE);
gtk_container_add (GTK_CONTAINER (button), color_preview[i+1]);
set_bucket (i+1, 1.0, 1.0, 1.0);
}
hbox2 = gtk_hbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (vbox2), hbox2, TRUE, FALSE, 0);
label = gtk_label_new ("Pressure:");
gtk_box_pack_start (GTK_BOX (hbox2), label, FALSE, FALSE, 0);
adj = gtk_adjustment_new (100.0, 0.0, 200.0, 1.0, 1.0, 0.0);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (pressure_adjust_update), NULL);
scale = gtk_hscale_new (GTK_ADJUSTMENT (adj));
gtk_scale_set_digits (GTK_SCALE (scale), 0);
gtk_box_pack_start (GTK_BOX (vbox2), scale, TRUE, TRUE, 0);
gtk_widget_show_all (hbox);
colorsel_water_setcolor (coldata, r, g, b, 0);
draw_all_buckets ();
return (vbox);
}
static void
colorsel_water_free (void *selector_data)
{
g_free (selector_data);
}
static void
colorsel_water_setcolor (void *data, int r, int g, int b,
int set_current)
{
set_bucket (0,
((gdouble) r) / 255.999,
((gdouble) g) / 255.999,
((gdouble) b) / 255.999);
draw_bucket (0);
}
static void
colorsel_water_update ()
{
int r;
int g;
int b;
r = (int) (bucket[0][0] * 255.999);
g = (int) (bucket[0][1] * 255.999);
b = (int) (bucket[0][2] * 255.999);
draw_bucket (0);
coldata->callback (coldata->data, r, g, b);
}
/* End of colorsel_gtk.c */
Reference in New Issue View Git Blame Copy Permalink