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gimp/app/widgets/gimpoverlaychild.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoverlaychild.c
* Copyright (C) 2009 Michael Natterer <mitch@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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include <libgimpmath/gimpmath.h>
#include "widgets-types.h"
#include "gimpoverlaybox.h"
#include "gimpoverlaychild.h"
/* local function prototypes */
static void gimp_overlay_child_transform_bounds (GimpOverlayChild *child,
GdkRectangle *bounds_child,
GdkRectangle *bounds_box);
static void gimp_overlay_child_from_embedder (GdkWindow *child_window,
gdouble box_x,
gdouble box_y,
gdouble *child_x,
gdouble *child_y,
GimpOverlayChild *child);
static void gimp_overlay_child_to_embedder (GdkWindow *child_window,
gdouble child_x,
gdouble child_y,
gdouble *box_x,
gdouble *box_y,
GimpOverlayChild *child);
/* public functions */
GimpOverlayChild *
gimp_overlay_child_new (GimpOverlayBox *box,
GtkWidget *widget,
gdouble xalign,
gdouble yalign,
gdouble angle,
gdouble opacity)
{
GimpOverlayChild *child;
g_return_val_if_fail (GIMP_IS_OVERLAY_BOX (box), NULL);
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
child = g_slice_new0 (GimpOverlayChild);
child->widget = widget;
child->xalign = CLAMP (xalign, 0.0, 1.0);
child->yalign = CLAMP (yalign, 0.0, 1.0);
child->x = 0.0;
child->y = 0.0;
child->has_position = FALSE;
child->angle = angle;
child->opacity = CLAMP (opacity, 0.0, 1.0);
cairo_matrix_init_identity (&child->matrix);
if (gtk_widget_get_realized (GTK_WIDGET (box)))
gimp_overlay_child_realize (box, child);
gtk_widget_set_parent (widget, GTK_WIDGET (box));
return child;
}
void
gimp_overlay_child_free (GimpOverlayBox *box,
GimpOverlayChild *child)
{
g_return_if_fail (GIMP_IS_OVERLAY_BOX (box));
g_return_if_fail (child != NULL);
gtk_widget_unparent (child->widget);
if (gtk_widget_get_realized (GTK_WIDGET (box)))
gimp_overlay_child_unrealize (box, child);
g_slice_free (GimpOverlayChild, child);
}
GimpOverlayChild *
gimp_overlay_child_find (GimpOverlayBox *box,
GtkWidget *widget)
{
GList *list;
g_return_val_if_fail (GIMP_IS_OVERLAY_BOX (box), NULL);
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
g_return_val_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (box),
NULL);
for (list = box->children; list; list = g_list_next (list))
{
GimpOverlayChild *child = list->data;
if (child->widget == widget)
return child;
}
return NULL;
}
void
gimp_overlay_child_realize (GimpOverlayBox *box,
GimpOverlayChild *child)
{
GtkWidget *widget;
GdkDisplay *display;
GdkScreen *screen;
GdkColormap *colormap;
GtkAllocation child_allocation;
GdkWindowAttr attributes;
gint attributes_mask;
g_return_if_fail (GIMP_IS_OVERLAY_BOX (box));
g_return_if_fail (child != NULL);
widget = GTK_WIDGET (box);
display = gtk_widget_get_display (widget);
screen = gtk_widget_get_screen (widget);
colormap = gdk_screen_get_rgba_colormap (screen);
if (colormap)
gtk_widget_set_colormap (child->widget, colormap);
gtk_widget_get_allocation (child->widget, &child_allocation);
if (gtk_widget_get_visible (child->widget))
{
attributes.width = child_allocation.width;
attributes.height = child_allocation.height;
}
else
{
attributes.width = 1;
attributes.height = 1;
}
attributes.x = child_allocation.x;
attributes.y = child_allocation.y;
attributes.window_type = GDK_WINDOW_OFFSCREEN;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (child->widget);
attributes.colormap = gtk_widget_get_colormap (child->widget);
attributes.event_mask = GDK_EXPOSURE_MASK;
attributes.cursor = gdk_cursor_new_for_display (display, GDK_LEFT_PTR);
attributes_mask = (GDK_WA_X |
GDK_WA_Y |
GDK_WA_VISUAL |
GDK_WA_COLORMAP |
GDK_WA_CURSOR);
child->window = gdk_window_new (gtk_widget_get_root_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (child->window, widget);
gtk_widget_set_parent_window (child->widget, child->window);
gdk_offscreen_window_set_embedder (child->window,
gtk_widget_get_window (widget));
gdk_cursor_unref (attributes.cursor);
g_signal_connect (child->window, "from-embedder",
G_CALLBACK (gimp_overlay_child_from_embedder),
child);
g_signal_connect (child->window, "to-embedder",
G_CALLBACK (gimp_overlay_child_to_embedder),
child);
gtk_style_set_background (gtk_widget_get_style (widget),
child->window, GTK_STATE_NORMAL);
gdk_window_show (child->window);
}
void
gimp_overlay_child_unrealize (GimpOverlayBox *box,
GimpOverlayChild *child)
{
g_return_if_fail (GIMP_IS_OVERLAY_BOX (box));
g_return_if_fail (child != NULL);
gdk_window_set_user_data (child->window, NULL);
gdk_window_destroy (child->window);
child->window = NULL;
}
void
gimp_overlay_child_size_request (GimpOverlayBox *box,
GimpOverlayChild *child)
{
GtkRequisition child_requisition;
g_return_if_fail (GIMP_IS_OVERLAY_BOX (box));
g_return_if_fail (child != NULL);
gtk_widget_size_request (child->widget, &child_requisition);
}
void
gimp_overlay_child_size_allocate (GimpOverlayBox *box,
GimpOverlayChild *child)
{
GtkWidget *widget;
GtkAllocation allocation;
GtkRequisition child_requisition;
GtkAllocation child_allocation;
gint x;
gint y;
g_return_if_fail (GIMP_IS_OVERLAY_BOX (box));
g_return_if_fail (child != NULL);
widget = GTK_WIDGET (box);
gtk_widget_get_allocation (widget, &allocation);
gtk_widget_get_child_requisition (child->widget, &child_requisition);
child_allocation.x = 0;
child_allocation.y = 0;
child_allocation.width = child_requisition.width;
child_allocation.height = child_requisition.height;
gtk_widget_size_allocate (child->widget, &child_allocation);
gtk_widget_get_allocation (child->widget, &child_allocation);
if (gtk_widget_get_realized (GTK_WIDGET (widget)))
{
GdkRectangle old_allocation;
GdkRectangle old_bounds;
gdk_window_get_position (child->window,
&old_allocation.x,
&old_allocation.y);
#if GTK_CHECK_VERSION (2, 24, 0)
old_allocation.width = gdk_window_get_width (child->window);
old_allocation.height = gdk_window_get_height (child->window);
#else
gdk_drawable_get_size (child->window,
&old_allocation.width,
&old_allocation.height);
#endif
gimp_overlay_child_transform_bounds (child, &old_allocation, &old_bounds);
gdk_window_invalidate_rect (gtk_widget_get_window (widget),
&old_bounds, FALSE);
gdk_window_move_resize (child->window,
child_allocation.x,
child_allocation.y,
child_allocation.width,
child_allocation.height);
}
cairo_matrix_init_identity (&child->matrix);
/* local transform */
cairo_matrix_rotate (&child->matrix, child->angle);
if (child->has_position)
{
x = child->x;
y = child->y;
}
else
{
GdkRectangle bounds;
gint border;
gint available_width;
gint available_height;
gimp_overlay_child_transform_bounds (child, &child_allocation, &bounds);
border = gtk_container_get_border_width (GTK_CONTAINER (box));
available_width = allocation.width - 2 * border;
available_height = allocation.height - 2 * border;
x = border;
y = border;
if (available_width > bounds.width)
x += child->xalign * (available_width - bounds.width) - bounds.x;
if (available_height > bounds.height)
y += child->yalign * (available_height - bounds.height) - bounds.y;
}
cairo_matrix_init_translate (&child->matrix, x, y);
/* local transform */
cairo_matrix_rotate (&child->matrix, child->angle);
}
gboolean
gimp_overlay_child_expose (GimpOverlayBox *box,
GimpOverlayChild *child,
GdkEventExpose *event)
{
GtkWidget *widget;
g_return_val_if_fail (GIMP_IS_OVERLAY_BOX (box), FALSE);
g_return_val_if_fail (child != NULL, FALSE);
g_return_val_if_fail (event != NULL, FALSE);
widget = GTK_WIDGET (box);
if (event->window == gtk_widget_get_window (widget))
{
GtkAllocation child_allocation;
GdkRectangle bounds;
gtk_widget_get_allocation (child->widget, &child_allocation);
gimp_overlay_child_transform_bounds (child, &child_allocation, &bounds);
if (gtk_widget_get_visible (child->widget) &&
gdk_rectangle_intersect (&event->area, &bounds, NULL))
{
GdkPixmap *pixmap = gdk_offscreen_window_get_pixmap (child->window);
cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
cairo_transform (cr, &child->matrix);
gdk_cairo_set_source_pixmap (cr, pixmap, 0, 0);
cairo_paint_with_alpha (cr, child->opacity);
cairo_destroy (cr);
}
}
else if (event->window == child->window)
{
if (! gtk_widget_get_app_paintable (child->widget))
gtk_paint_flat_box (gtk_widget_get_style (child->widget),
event->window,
GTK_STATE_NORMAL, GTK_SHADOW_NONE,
&event->area, widget, NULL,
0, 0, -1, -1);
gtk_container_propagate_expose (GTK_CONTAINER (widget),
child->widget,
event);
return TRUE;
}
return FALSE;
}
gboolean
gimp_overlay_child_damage (GimpOverlayBox *box,
GimpOverlayChild *child,
GdkEventExpose *event)
{
GtkWidget *widget;
g_return_val_if_fail (GIMP_IS_OVERLAY_BOX (box), FALSE);
g_return_val_if_fail (child != NULL, FALSE);
g_return_val_if_fail (event != NULL, FALSE);
widget = GTK_WIDGET (box);
if (event->window == child->window)
{
GdkRectangle *rects;
gint n_rects;
gint i;
gdk_region_get_rectangles (event->region, &rects, &n_rects);
for (i = 0; i < n_rects; i++)
{
GdkRectangle bounds;
gimp_overlay_child_transform_bounds (child, &rects[i], &bounds);
gdk_window_invalidate_rect (gtk_widget_get_window (widget),
&bounds, FALSE);
}
g_free (rects);
return TRUE;
}
return FALSE;
}
void
gimp_overlay_child_invalidate (GimpOverlayBox *box,
GimpOverlayChild *child)
{
GdkWindow *window;
g_return_if_fail (GIMP_IS_OVERLAY_BOX (box));
g_return_if_fail (child != NULL);
window = gtk_widget_get_window (GTK_WIDGET (box));
if (window && gtk_widget_get_visible (child->widget))
{
GtkAllocation child_allocation;
GdkRectangle bounds;
gtk_widget_get_allocation (child->widget, &child_allocation);
gimp_overlay_child_transform_bounds (child, &child_allocation,
&bounds);
gdk_window_invalidate_rect (window, &bounds, FALSE);
}
}
gboolean
gimp_overlay_child_pick (GimpOverlayBox *box,
GimpOverlayChild *child,
gdouble box_x,
gdouble box_y)
{
GtkAllocation child_allocation;
gdouble child_x;
gdouble child_y;
g_return_val_if_fail (GIMP_IS_OVERLAY_BOX (box), FALSE);
g_return_val_if_fail (child != NULL, FALSE);
gimp_overlay_child_from_embedder (child->window,
box_x, box_y,
&child_x, &child_y,
child);
gtk_widget_get_allocation (child->widget, &child_allocation);
if (child_x >= 0 &&
child_x < child_allocation.width &&
child_y >= 0 &&
child_y < child_allocation.height)
{
return TRUE;
}
return FALSE;
}
/* private functions */
static void
gimp_overlay_child_transform_bounds (GimpOverlayChild *child,
GdkRectangle *bounds_child,
GdkRectangle *bounds_box)
{
gdouble x1, x2, x3, x4;
gdouble y1, y2, y3, y4;
x1 = bounds_child->x;
y1 = bounds_child->y;
x2 = bounds_child->x + bounds_child->width;
y2 = bounds_child->y;
x3 = bounds_child->x;
y3 = bounds_child->y + bounds_child->height;
x4 = bounds_child->x + bounds_child->width;
y4 = bounds_child->y + bounds_child->height;
cairo_matrix_transform_point (&child->matrix, &x1, &y1);
cairo_matrix_transform_point (&child->matrix, &x2, &y2);
cairo_matrix_transform_point (&child->matrix, &x3, &y3);
cairo_matrix_transform_point (&child->matrix, &x4, &y4);
#define MIN4(a,b,c,d) MIN(MIN((a),(b)),MIN((c),(d)))
#define MAX4(a,b,c,d) MAX(MAX((a),(b)),MAX((c),(d)))
bounds_box->x = (gint) floor (MIN4 (x1, x2, x3, x4));
bounds_box->y = (gint) floor (MIN4 (y1, y2, y3, y4));
bounds_box->width = (gint) ceil (MAX4 (x1, x2, x3, x4)) - bounds_box->x;
bounds_box->height = (gint) ceil (MAX4 (y1, y2, y3, y4)) - bounds_box->y;
}
static void
gimp_overlay_child_from_embedder (GdkWindow *child_window,
gdouble box_x,
gdouble box_y,
gdouble *child_x,
gdouble *child_y,
GimpOverlayChild *child)
{
cairo_matrix_t inverse = child->matrix;
*child_x = box_x;
*child_y = box_y;
cairo_matrix_invert (&inverse);
cairo_matrix_transform_point (&inverse, child_x, child_y);
}
static void
gimp_overlay_child_to_embedder (GdkWindow *child_window,
gdouble child_x,
gdouble child_y,
gdouble *box_x,
gdouble *box_y,
GimpOverlayChild *child)
{
*box_x = child_x;
*box_y = child_y;
cairo_matrix_transform_point (&child->matrix, box_x, box_y);
}
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