gimp/plug-ins/imagemap/imap_preview.c

544 lines
15 KiB
C

/*
* This is a plug-in for the GIMP.
*
* Generates clickable image maps.
*
* Copyright (C) 1998-2005 Maurits Rijk m.rijk@chello.nl
*
* 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 "config.h"
#include <gtk/gtk.h>
#include "libgimp/gimp.h"
#include <libgimp/gimpui.h>
#include "imap_commands.h"
#include "imap_grid.h"
#include "imap_main.h"
#include "imap_menu.h"
#include "imap_preview.h"
#define PREVIEW_MASK (GDK_EXPOSURE_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON_MOTION_MASK | \
GDK_KEY_PRESS_MASK | \
GDK_KEY_RELEASE_MASK | \
GDK_ENTER_NOTIFY_MASK | \
GDK_LEAVE_NOTIFY_MASK)
#define PREVIEW_SIZE 400
/*======================================================================
Preview Rendering Util routine
=======================================================================*/
#define CHECKWIDTH 4
#define LIGHTCHECK 192
#define DARKCHECK 128
#ifndef OPAQUE
#define OPAQUE 255
#endif
static Preview_t*
preview_user_data(GtkWidget *preview)
{
return (Preview_t*) g_object_get_data (G_OBJECT (preview), "preview");
}
gint
preview_get_width(GtkWidget *preview)
{
return preview_user_data(preview)->width;
}
gint
preview_get_height(GtkWidget *preview)
{
return preview_user_data(preview)->height;
}
static void
render_gray_image(Preview_t *preview_base, GimpPixelRgn *srcrgn)
{
guchar *src_row, *dest_buffer, *src, *dest;
gint row, col;
gint bpp, dwidth, dheight, pwidth, pheight;
gint *src_col;
GtkWidget *preview = preview_base->preview;
dwidth = srcrgn->w;
dheight = srcrgn->h;
pwidth = preview_base->widget_width;
pheight = preview_base->widget_height;
bpp = srcrgn->bpp;
src_row = g_new(guchar, dwidth * bpp);
dest_buffer = g_new(guchar, pwidth * pheight);
src_col = g_new(gint, pwidth);
for (col = 0; col < pwidth; col++)
src_col[col] = (col * dwidth / pwidth) * bpp;
dest = dest_buffer;
for (row = 0; row < pheight; row++) {
gimp_pixel_rgn_get_row(srcrgn, src_row, 0, row * dheight / pheight,
dwidth);
src = src_row;
for (col = 0; col < pwidth; col++) {
src = &src_row[src_col[col]];
*dest++ = *src;
}
}
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview),
0, 0, pwidth, pheight,
GIMP_GRAY_IMAGE,
dest_buffer,
pwidth);
g_free(src_col);
g_free(src_row);
g_free(dest_buffer);
}
static void
render_indexed_image(Preview_t *preview_base, GimpPixelRgn *srcrgn)
{
guchar *src_row, *dest_buffer, *src, *dest;
gint row, col;
gint dwidth, dheight, pwidth, pheight;
gint *src_col;
gint bpp, alpha, has_alpha;
guchar *cmap, *colour;
gint ncols;
gboolean gray = get_map_info()->show_gray;
GtkWidget *preview = preview_base->preview;
dwidth = srcrgn->w;
dheight = srcrgn->h;
pwidth = preview_base->widget_width;
pheight = preview_base->widget_height;
bpp = srcrgn->bpp;
alpha = bpp;
has_alpha = gimp_drawable_has_alpha(srcrgn->drawable->drawable_id);
if (has_alpha)
alpha--;
cmap = gimp_image_get_colormap (gimp_drawable_get_image (srcrgn->drawable->drawable_id),
&ncols);
src_row = g_new(guchar, dwidth * bpp);
dest_buffer = g_new(guchar, pwidth * pheight * 3);
src_col = g_new(gint, pwidth);
for (col = 0; col < pwidth; col++)
src_col[col] = (col * dwidth / pwidth) * bpp;
dest = dest_buffer;
for (row = 0; row < pheight; row++) {
gimp_pixel_rgn_get_row(srcrgn, src_row, 0, row * dheight / pheight,
dwidth);
for (col = 0; col < pwidth; col++) {
src = &src_row[src_col[col]];
colour = cmap + 3 * (int)(*src);
if (gray) {
guchar avg = (299 * colour[0] + 587 * colour[1] +
114 * colour[2]) / 1000;
*dest++ = avg;
*dest++ = avg;
*dest++ = avg;
} else {
*dest++ = colour[0];
*dest++ = colour[1];
*dest++ = colour[2];
}
}
}
gimp_preview_area_draw(GIMP_PREVIEW_AREA(preview),
0, 0, pwidth, pheight,
GIMP_RGB_IMAGE,
dest_buffer,
pwidth * 3);
g_free(src_col);
g_free(src_row);
g_free(dest_buffer);
}
static void
render_rgb_image(Preview_t *preview_base, GimpPixelRgn *srcrgn)
{
guchar *src_row, *dest_buffer, *src, *dest;
gint row, col;
gint dwidth, dheight, pwidth, pheight;
gint *src_col;
gint bpp, alpha, has_alpha, b;
guchar check;
gboolean gray = get_map_info()->show_gray;
GtkWidget *preview = preview_base->preview;
dwidth = srcrgn->w;
dheight = srcrgn->h;
pwidth = preview_base->widget_width;
pheight = preview_base->widget_height;
bpp = srcrgn->bpp;
alpha = bpp;
has_alpha = gimp_drawable_has_alpha(srcrgn->drawable->drawable_id);
if (has_alpha)
alpha--;
src_row = g_new(guchar, dwidth * bpp);
dest_buffer = g_new(guchar, pwidth * pheight * bpp);
src_col = g_new(gint, pwidth);
for (col = 0; col < pwidth; col++)
src_col[col] = (col * dwidth / pwidth) * bpp;
dest = dest_buffer;
for (row = 0; row < pheight; row++) {
gimp_pixel_rgn_get_row(srcrgn, src_row, 0, row * dheight / pheight,
dwidth);
for (col = 0; col < pwidth; col++) {
src = &src_row[src_col[col]];
if(!has_alpha || src[alpha] == OPAQUE) {
/* no alpha channel or opaque -- simple way */
for (b = 0; b < alpha; b++)
dest[b] = src[b];
} else {
/* more or less transparent */
if( ( col % (CHECKWIDTH*2) < CHECKWIDTH ) ^
( row % (CHECKWIDTH*2) < CHECKWIDTH ) )
check = LIGHTCHECK;
else
check = DARKCHECK;
if (src[alpha] == 0) {
/* full transparent -- check */
for (b = 0; b < alpha; b++)
dest[b] = check;
} else {
/* middlemost transparent -- mix check and src */
for (b = 0; b < alpha; b++)
dest[b] = (src[b] * src[alpha] +
check * (OPAQUE - src[alpha])) / OPAQUE;
}
}
if (gray) {
guchar avg;
avg = (299 * dest[0] + 587 * dest[1] + 114 * dest[2]) / 1000;
for (b = 0; b < alpha; b++)
dest[b] = avg;
}
dest += alpha;
}
}
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview),
0, 0, pwidth, pheight,
GIMP_RGB_IMAGE,
dest_buffer,
pwidth * 3);
g_free(src_col);
g_free(src_row);
g_free(dest_buffer);
}
static void
render_preview(Preview_t *preview_base, GimpPixelRgn *srcrgn)
{
switch (gimp_drawable_type(srcrgn->drawable->drawable_id)) {
case GIMP_RGB_IMAGE:
case GIMP_RGBA_IMAGE:
render_rgb_image(preview_base, srcrgn);
break;
case GIMP_GRAY_IMAGE:
case GIMP_GRAYA_IMAGE:
render_gray_image(preview_base, srcrgn);
break;
case GIMP_INDEXED_IMAGE:
case GIMP_INDEXEDA_IMAGE:
render_indexed_image(preview_base, srcrgn);
break;
}
}
static gboolean
arrow_cb(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
if (event->button == 1)
do_main_popup_menu(event);
return TRUE;
}
static gboolean
preview_expose(GtkWidget *widget, GdkEventExpose *event)
{
draw_grid(widget);
draw_shapes(widget);
return FALSE;
}
void
add_preview_motion_event(Preview_t *preview, GCallback func)
{
g_return_if_fail (func != NULL);
g_signal_connect(preview->preview, "motion-notify-event",
func, NULL);
}
void
add_enter_notify_event(Preview_t *preview, GCallback func)
{
g_return_if_fail (func != NULL);
g_signal_connect(preview->preview, "enter-notify-event",
func, NULL);
}
void
add_leave_notify_event(Preview_t *preview, GCallback func)
{
g_return_if_fail (func != NULL);
g_signal_connect(preview->preview, "leave-notify-event",
func, NULL);
}
void
add_preview_button_press_event(Preview_t *preview, GCallback func)
{
g_return_if_fail (func != NULL);
g_signal_connect(preview->preview, "button-press-event",
func, NULL);
}
void
preview_redraw(Preview_t *preview)
{
gtk_widget_queue_draw(preview->preview);
}
void
preview_zoom(Preview_t *preview, gint zoom_factor)
{
preview->widget_width = preview->width * zoom_factor;
preview->widget_height = preview->height * zoom_factor;
gtk_widget_set_size_request (preview->preview, preview->widget_width,
preview->widget_height);
gtk_widget_queue_resize(preview->window);
render_preview(preview, &preview->src_rgn);
preview_redraw(preview);
}
GdkCursorType
preview_set_cursor(Preview_t *preview, GdkCursorType cursor_type)
{
GdkCursorType prev_cursor = preview->cursor;
GdkDisplay *display = gtk_widget_get_display (preview->window);
GdkCursor *cursor = gdk_cursor_new_for_display (display,
cursor_type);
gdk_window_set_cursor(preview->window->window, cursor);
gdk_cursor_unref(cursor);
preview->cursor = cursor_type;
return prev_cursor;
}
static const GtkTargetEntry target_table[] = {
{"STRING", 0, 1 },
{"text/plain", 0, 2 }
};
static void
handle_drop(GtkWidget *widget, GdkDragContext *context, gint x, gint y,
GtkSelectionData *data, guint info, guint time)
{
gboolean success = FALSE;
if (data->length >= 0 && data->format == 8) {
ObjectList_t *list = get_shapes();
Object_t *obj;
x = get_real_coord(x);
y = get_real_coord(y);
obj = object_list_find(list, x, y);
if (obj && !obj->locked) {
command_list_add(edit_object_command_new(obj));
object_set_url(obj, (const gchar *) data->data);
object_emit_update_signal(obj);
success = TRUE;
}
}
gtk_drag_finish(context, success, FALSE, time);
}
static void
preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
gpointer preview_void)
{
Preview_t * preview = preview_void;
render_preview(preview, &preview->src_rgn);
}
static void
scroll_adj_changed (GtkAdjustment *adj,
GtkRuler *ruler)
{
gtk_ruler_set_range (ruler,
adj->value, adj->value + adj->page_size,
G_MAXDOUBLE, adj->page_size);
}
Preview_t*
make_preview(GimpDrawable *drawable)
{
Preview_t *data = g_new(Preview_t, 1);
GtkAdjustment *hadj;
GtkAdjustment *vadj;
GtkWidget *preview;
GtkWidget *window;
GtkWidget *button, *arrow;
GtkWidget *ruler;
GtkWidget *table;
GtkWidget *scrollbar;
gint width, height;
data->drawable = drawable;
data->preview = preview = gimp_preview_area_new ();
g_object_set_data (G_OBJECT (preview), "preview", data);
gtk_widget_set_events(GTK_WIDGET(preview), PREVIEW_MASK);
g_signal_connect_after(preview, "expose-event",
G_CALLBACK(preview_expose), data);
g_signal_connect (preview, "size-allocate",
G_CALLBACK (preview_size_allocate), (gpointer)data);
/* Handle drop of links in preview widget */
gtk_drag_dest_set(preview, GTK_DEST_DEFAULT_ALL, target_table,
2, GDK_ACTION_COPY);
g_signal_connect(preview, "drag-data-received",
G_CALLBACK(handle_drop), NULL);
data->widget_width = data->width =
gimp_drawable_width(drawable->drawable_id);
data->widget_height = data->height =
gimp_drawable_height(drawable->drawable_id);
gtk_widget_set_size_request (preview, data->widget_width,
data->widget_height);
/* The main table */
data->window = table = gtk_table_new(3, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 1);
gtk_table_set_row_spacings (GTK_TABLE (table), 1);
/* Create button with arrow */
button = gtk_button_new();
GTK_WIDGET_UNSET_FLAGS(button, GTK_CAN_FOCUS);
gtk_table_attach(GTK_TABLE(table), button, 0, 1, 0, 1, GTK_FILL, GTK_FILL,
0, 0);
gtk_widget_set_events(button,
GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
g_signal_connect(button, "button-press-event",
G_CALLBACK(arrow_cb), NULL);
gtk_widget_show(button);
arrow = gtk_arrow_new(GTK_ARROW_RIGHT, GTK_SHADOW_OUT);
gtk_container_add(GTK_CONTAINER(button), arrow);
gtk_widget_show(arrow);
/* Create horizontal ruler */
data->hruler = ruler = gtk_hruler_new();
g_signal_connect_swapped(preview, "motion-notify-event",
G_CALLBACK(GTK_WIDGET_GET_CLASS(ruler)->motion_notify_event),
ruler);
gtk_table_attach(GTK_TABLE(table), ruler, 1, 2, 0, 1,
GTK_EXPAND | GTK_SHRINK | GTK_FILL, GTK_FILL, 0, 0);
gtk_widget_show(ruler);
/* Create vertical ruler */
data->vruler = ruler = gtk_vruler_new();
g_signal_connect_swapped(preview, "motion-notify-event",
G_CALLBACK(GTK_WIDGET_GET_CLASS(ruler)->motion_notify_event),
ruler);
gtk_table_attach(GTK_TABLE(table), ruler, 0, 1, 1, 2,
GTK_FILL, GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0);
gtk_widget_show(ruler);
window = gtk_scrolled_window_new (NULL, NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(window),
GTK_POLICY_NEVER, GTK_POLICY_NEVER);
width = (data->width > 600) ? 600 : data->width;
height = (data->height > 400) ? 400 : data->height;
gtk_widget_set_size_request(window, width, height);
gtk_table_attach(GTK_TABLE(table), window, 1, 2, 1, 2, GTK_FILL, GTK_FILL,
0, 0);
gtk_widget_show(window);
hadj = gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (window));
g_signal_connect (hadj, "changed",
G_CALLBACK (scroll_adj_changed),
data->hruler);
g_signal_connect (hadj, "value-changed",
G_CALLBACK (scroll_adj_changed),
data->hruler);
vadj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (window));
g_signal_connect (vadj, "changed",
G_CALLBACK (scroll_adj_changed),
data->vruler);
g_signal_connect (vadj, "value-changed",
G_CALLBACK (scroll_adj_changed),
data->vruler);
gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW(window), preview);
scrollbar = gtk_hscrollbar_new (hadj);
gtk_table_attach(GTK_TABLE(table), scrollbar, 1, 2, 2, 3,
GTK_FILL | GTK_SHRINK, GTK_FILL | GTK_SHRINK, 0, 0);
gtk_widget_show (scrollbar);
scrollbar = gtk_vscrollbar_new (vadj);
gtk_table_attach(GTK_TABLE(table), scrollbar, 2, 3, 1, 2,
GTK_FILL | GTK_SHRINK, GTK_FILL | GTK_SHRINK, 0, 0);
gtk_widget_show (scrollbar);
gtk_widget_show (preview);
gimp_pixel_rgn_init(&data->src_rgn, drawable, 0, 0, data->width,
data->height, FALSE, FALSE);
render_preview(data, &data->src_rgn);
gtk_widget_show(table);
return data;
}