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gimp/libgimp/gimpzoompreview.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpzoompreview.c
* Copyright (C) 2005 David Odin <dindinx@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 2 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
* Lesser 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, 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 "libgimpwidgets/gimpwidgets.h"
#include "gimpuitypes.h"
#include "gimp.h"
#include "libgimp-intl.h"
#include "gimpzoompreview.h"
#define SELECTION_BORDER 2
typedef struct _GimpZoomPreviewPrivate GimpZoomPreviewPrivate;
struct _GimpZoomPreviewPrivate
{
GimpDrawable *drawable;
GimpZoomModel *model;
GdkRectangle extents;
};
#define GIMP_ZOOM_PREVIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GIMP_TYPE_ZOOM_PREVIEW, GimpZoomPreviewPrivate))
static void gimp_zoom_preview_set_adjustments (GimpZoomPreview *preview,
gdouble old_factor,
gdouble new_factor);
static void gimp_zoom_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpZoomPreview *preview);
static void gimp_zoom_preview_style_set (GtkWidget *widget,
GtkStyle *prev_style);
static gboolean gimp_zoom_preview_scroll_event (GtkWidget *widget,
GdkEventScroll *event,
GimpZoomPreview *preview);
static void gimp_zoom_preview_draw (GimpPreview *preview);
static void gimp_zoom_preview_draw_buffer (GimpPreview *preview,
const guchar *buffer,
gint rowstride);
static void gimp_zoom_preview_draw_thumb (GimpPreview *preview,
GimpPreviewArea *area,
gint width,
gint height);
static gboolean gimp_zoom_preview_get_bounds (GimpDrawable *drawable,
gint *xmin,
gint *ymin,
gint *xmax,
gint *ymax);
G_DEFINE_TYPE (GimpZoomPreview, gimp_zoom_preview,
GIMP_TYPE_SCROLLED_PREVIEW)
#define parent_class gimp_zoom_preview_parent_class
static void
gimp_zoom_preview_class_init (GimpZoomPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpPreviewClass *preview_class = GIMP_PREVIEW_CLASS (klass);
widget_class->style_set = gimp_zoom_preview_style_set;
preview_class->draw = gimp_zoom_preview_draw;
preview_class->draw_buffer = gimp_zoom_preview_draw_buffer;
preview_class->draw_thumb = gimp_zoom_preview_draw_thumb;
g_type_class_add_private (object_class, sizeof (GimpZoomPreviewPrivate));
}
static void
gimp_zoom_preview_init (GimpZoomPreview *preview)
{
GtkWidget *button_bar;
GtkWidget *button;
GtkWidget *box;
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
priv->model = gimp_zoom_model_new ();
gimp_zoom_model_set_range (GIMP_ZOOM_MODEL (priv->model), 1.0, 256.0);
g_signal_connect_swapped (priv->model, "zoomed",
G_CALLBACK (gimp_zoom_preview_set_adjustments),
preview);
box = gimp_preview_get_controls (GIMP_PREVIEW (preview));
g_return_if_fail (GTK_IS_BOX (box));
button_bar = gtk_hbox_new (FALSE, 2);
gtk_box_pack_end (GTK_BOX (box), button_bar, FALSE, FALSE, 0);
gtk_widget_show (button_bar);
/* zoom out */
button = gimp_zoom_button_new (priv->model,
GIMP_ZOOM_OUT, GTK_ICON_SIZE_SMALL_TOOLBAR);
gtk_box_pack_start (GTK_BOX (button_bar), button, FALSE, FALSE, 0);
gtk_widget_show (button);
/* zoom in */
button = gimp_zoom_button_new (priv->model,
GIMP_ZOOM_IN, GTK_ICON_SIZE_SMALL_TOOLBAR);
gtk_box_pack_start (GTK_BOX (button_bar), button, FALSE, FALSE, 0);
gtk_widget_show (button);
g_signal_connect (GIMP_PREVIEW (preview)->area, "size-allocate",
G_CALLBACK (gimp_zoom_preview_size_allocate),
preview);
g_signal_connect (GIMP_PREVIEW (preview)->area, "scroll-event",
G_CALLBACK (gimp_zoom_preview_scroll_event),
preview);
g_object_set (GIMP_PREVIEW (preview)->area,
"check-size", gimp_check_size (),
"check-type", gimp_check_type (),
NULL);
gimp_scrolled_preview_set_policy (GIMP_SCROLLED_PREVIEW (preview),
GTK_POLICY_ALWAYS, GTK_POLICY_ALWAYS);
}
static void
gimp_zoom_preview_set_adjustments (GimpZoomPreview *preview,
gdouble old_factor,
gdouble new_factor)
{
GimpScrolledPreview *scrolled_preview = GIMP_SCROLLED_PREVIEW (preview);
GtkAdjustment *adj;
gdouble width;
gdouble height;
gdouble ratio;
scrolled_preview->in_drag = TRUE;
width = GIMP_PREVIEW (preview)->width;
height = GIMP_PREVIEW (preview)->height;
ratio = new_factor / old_factor;
adj = gtk_range_get_adjustment (GTK_RANGE (scrolled_preview->hscr));
adj->lower = 0;
adj->page_size = width;
adj->upper = width * new_factor;
adj->step_increment = new_factor;
adj->page_increment = MAX (width / 2.0, adj->step_increment);
adj->value = CLAMP ((adj->value + width / 2.0) * ratio
- width / 2.0,
adj->lower, adj->upper - width);
gtk_adjustment_changed (adj);
gtk_adjustment_value_changed (adj);
adj = gtk_range_get_adjustment (GTK_RANGE (scrolled_preview->vscr));
adj->lower = 0;
adj->page_size = height;
adj->upper = height * new_factor;
adj->step_increment = new_factor;
adj->page_increment = MAX (height / 2.0, adj->step_increment);
adj->value = CLAMP ((adj->value + height / 2.0) * ratio
- height / 2.0,
adj->lower, adj->upper - height);
gtk_adjustment_changed (adj);
scrolled_preview->in_drag = FALSE;
gtk_adjustment_value_changed (adj);
}
static void
gimp_zoom_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpZoomPreview *preview)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
gdouble zoom_factor;
gint width = GIMP_PREVIEW (preview)->xmax - GIMP_PREVIEW (preview)->xmin;
gint height = GIMP_PREVIEW (preview)->ymax - GIMP_PREVIEW (preview)->ymin;
GIMP_PREVIEW (preview)->width = MIN (width, allocation->width);
GIMP_PREVIEW (preview)->height = MIN (height, allocation->height);
zoom_factor = gimp_zoom_model_get_factor (priv->model);
gimp_zoom_preview_set_adjustments (preview, zoom_factor, zoom_factor);
}
static void
gimp_zoom_preview_style_set (GtkWidget *widget,
GtkStyle *prev_style)
{
GimpPreview *preview = GIMP_PREVIEW (widget);
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable = priv->drawable;
gint size;
gint width, height;
gint x1, y1;
gint x2, y2;
if (GTK_WIDGET_CLASS (parent_class)->style_set)
GTK_WIDGET_CLASS (parent_class)->style_set (widget, prev_style);
gtk_widget_style_get (widget, "size", &size, NULL);
if (gimp_zoom_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
}
else
{
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
}
if (width > height)
{
preview->width = MIN (width, size);
preview->height = (height * preview->width) / width;
}
else
{
preview->height = MIN (height, size);
preview->width = (width * preview->height) / height;
}
gtk_widget_set_size_request (preview->area,
preview->width, preview->height);
}
static gboolean
gimp_zoom_preview_scroll_event (GtkWidget *widget,
GdkEventScroll *event,
GimpZoomPreview *preview)
{
if (event->state & GDK_CONTROL_MASK)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GIMP_SCROLLED_PREVIEW (preview)->in_drag = TRUE;
switch (event->direction)
{
case GDK_SCROLL_UP:
gimp_zoom_model_zoom (priv->model, GIMP_ZOOM_IN, 0.0);
break;
case GDK_SCROLL_DOWN:
gimp_zoom_model_zoom (priv->model, GIMP_ZOOM_OUT, 0.0);
break;
default:
break;
}
GIMP_SCROLLED_PREVIEW (preview)->in_drag = FALSE;
}
return FALSE;
}
static void
gimp_zoom_preview_draw (GimpPreview *preview)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable;
guchar *data;
gint width;
gint height;
gint bpp;
gint src_x;
gint src_y;
gint src_width;
gint src_height;
gdouble zoom_factor;
g_return_if_fail (GIMP_IS_ZOOM_PREVIEW (preview));
drawable = priv->drawable;
if (!drawable)
return;
zoom_factor = gimp_zoom_model_get_factor (priv->model);
width = preview->width;
height = preview->height;
src_x = (priv->extents.x +
preview->xoff * priv->extents.width / width / zoom_factor);
src_y = (priv->extents.y +
preview->yoff * priv->extents.height / height / zoom_factor);
src_width = priv->extents.width / zoom_factor;
src_height = priv->extents.height / zoom_factor;
data = gimp_drawable_get_sub_thumbnail_data (drawable->drawable_id,
src_x, src_y,
src_width, src_height,
&width, &height, &bpp);
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview->area),
0, 0, width, height,
gimp_drawable_type (drawable->drawable_id),
data, width * bpp);
g_free (data);
}
static void
gimp_zoom_preview_draw_buffer (GimpPreview *preview,
const guchar *buffer,
gint rowstride)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable = priv->drawable;
gint32 image_id;
image_id = gimp_drawable_get_image (drawable->drawable_id);
if (gimp_selection_is_empty (image_id))
{
gimp_preview_area_draw (GIMP_PREVIEW_AREA (preview->area),
0, 0,
preview->width, preview->height,
gimp_drawable_type (drawable->drawable_id),
buffer,
rowstride);
}
else
{
guchar *sel;
guchar *src;
gint selection_id;
gint width, height;
gint bpp;
gint src_x;
gint src_y;
gint src_width;
gint src_height;
gdouble zoom_factor;
zoom_factor = gimp_zoom_model_get_factor (priv->model);
selection_id = gimp_image_get_selection (image_id);
width = preview->width;
height = preview->height;
src_x = priv->extents.x +
preview->xoff * priv->extents.width / width / zoom_factor;
src_y = priv->extents.y +
preview->yoff * priv->extents.height / height / zoom_factor;
src_width = priv->extents.width / zoom_factor;
src_height = priv->extents.height / zoom_factor;
src = gimp_drawable_get_sub_thumbnail_data (drawable->drawable_id,
src_x, src_y,
src_width, src_height,
&width, &height, &bpp);
sel = gimp_drawable_get_sub_thumbnail_data (selection_id,
src_x, src_y,
src_width, src_height,
&width, &height, &bpp);
gimp_preview_area_mask (GIMP_PREVIEW_AREA (preview->area),
0, 0, preview->width, preview->height,
gimp_drawable_type (drawable->drawable_id),
src, width * drawable->bpp,
buffer, rowstride,
sel, width);
g_free (sel);
g_free (src);
}
}
static void
gimp_zoom_preview_draw_thumb (GimpPreview *preview,
GimpPreviewArea *area,
gint width,
gint height)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpDrawable *drawable = priv->drawable;
guchar *buffer;
gint x1, y1, x2, y2;
gint bpp;
gint size = 100;
gint nav_width, nav_height;
if (! drawable)
return;
if (gimp_zoom_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
}
else
{
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
}
if (width > height)
{
nav_width = MIN (width, size);
nav_height = (height * nav_width) / width;
}
else
{
nav_height = MIN (height, size);
nav_width = (width * nav_height) / height;
}
if (gimp_zoom_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
buffer = gimp_drawable_get_sub_thumbnail_data (drawable->drawable_id,
x1, y1, x2 - x1, y2 - y1,
&nav_width, &nav_height,
&bpp);
}
else
{
buffer = gimp_drawable_get_thumbnail_data (drawable->drawable_id,
&nav_width, &nav_height, &bpp);
}
if (buffer)
{
GimpImageType type;
gtk_widget_set_size_request (GTK_WIDGET (area), nav_width, nav_height);
gtk_widget_show (GTK_WIDGET (area));
gtk_widget_realize (GTK_WIDGET (area));
switch (bpp)
{
case 1: type = GIMP_GRAY_IMAGE; break;
case 2: type = GIMP_GRAYA_IMAGE; break;
case 3: type = GIMP_RGB_IMAGE; break;
case 4: type = GIMP_RGBA_IMAGE; break;
default:
g_free (buffer);
return;
}
gimp_preview_area_draw (area,
0, 0, nav_width, nav_height,
type, buffer, bpp * nav_width);
g_free (buffer);
}
}
#define MAX3(a, b, c) (MAX (MAX ((a), (b)), (c)))
#define MIN3(a, b, c) (MIN (MIN ((a), (b)), (c)))
static gboolean
gimp_zoom_preview_get_bounds (GimpDrawable *drawable,
gint *xmin,
gint *ymin,
gint *xmax,
gint *ymax)
{
gboolean retval;
gint width;
gint height;
gint offset_x;
gint offset_y;
gint x1, y1;
gint x2, y2;
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
retval = gimp_drawable_mask_bounds (drawable->drawable_id,
&x1, &y1, &x2, &y2);
gimp_drawable_offsets (drawable->drawable_id, &offset_x, &offset_y);
*xmin = MAX3 (x1 - SELECTION_BORDER, 0, - offset_x);
*ymin = MAX3 (y1 - SELECTION_BORDER, 0, - offset_y);
*xmax = MIN3 (x2 + SELECTION_BORDER, width, width + offset_x);
*ymax = MIN3 (y2 + SELECTION_BORDER, height, height + offset_y);
return retval;
}
/**
* gimp_zoom_preview_new:
* @drawable: a #GimpDrawable
*
* Creates a new #GimpZoomPreview widget for @drawable.
*
* Since: GIMP 2.4
**/
GtkWidget *
gimp_zoom_preview_new (GimpDrawable *drawable)
{
GimpZoomPreview *preview;
GimpZoomPreviewPrivate *priv;
gint width, height;
gint max_width, max_height;
gint x1, y1;
gint x2, y2;
preview = g_object_new (GIMP_TYPE_ZOOM_PREVIEW, NULL);
priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
priv->drawable = drawable;
if (gimp_zoom_preview_get_bounds (drawable, &x1, &y1, &x2, &y2))
{
width = x2 - x1;
height = y2 - y1;
priv->extents.x = x1;
priv->extents.y = y1;
}
else
{
width = gimp_drawable_width (drawable->drawable_id);
height = gimp_drawable_height (drawable->drawable_id);
priv->extents.x = 0;
priv->extents.y = 0;
}
priv->extents.width = width;
priv->extents.height = height;
if (width > height)
{
max_width = MIN (width, 512);
max_height = (height * max_width) / width;
}
else
{
max_height = MIN (height, 512);
max_width = (width * max_height) / height;
}
gimp_preview_set_bounds (GIMP_PREVIEW (preview),
0, 0, max_width, max_height);
g_object_set (GIMP_PREVIEW (preview)->frame,
"ratio", (gdouble) width / (gdouble) height,
NULL);
gimp_zoom_preview_set_adjustments (preview, 1.0, 1.0);
return GTK_WIDGET (preview);
}
/**
* gimp_zoom_get_drawable:
* @preview: a #GimpZoomPreview widget
*
* Return Value: the #GimpDrawable that was passed to gimp_zoom_preview_new().
*
* Since: GIMP 2.4
**/
GimpDrawable *
gimp_zoom_preview_get_drawable (GimpZoomPreview *preview)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
return priv->drawable;
}
/**
* gimp_zoom_get_factor:
* @preview: a #GimpZoomPreview widget
*
* Return Value: the current zoom factor
*
* Since: GIMP 2.4
**/
gdouble
gimp_zoom_preview_get_factor (GimpZoomPreview *preview)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
return gimp_zoom_model_get_factor (priv->model);
}
/**
* gimp_zoom_preview_get_source:
* @preview:
* @width:
* @height:
* @bpp:
*
*
* Return Value:
*
* Since: GIMP 2.4
*/
guchar *
gimp_zoom_preview_get_source (GimpZoomPreview *preview,
gint *width,
gint *height,
gint *bpp)
{
GimpZoomPreviewPrivate *priv = GIMP_ZOOM_PREVIEW_GET_PRIVATE (preview);
GimpPreview *gimp_preview = GIMP_PREVIEW (preview);
GimpDrawable *drawable = priv->drawable;
guchar *data;
gint src_x;
gint src_y;
gint src_width;
gint src_height;
gdouble zoom_factor;
zoom_factor = gimp_zoom_model_get_factor (priv->model);
*width = gimp_preview->width;
*height = gimp_preview->height;
src_x = priv->extents.x +
gimp_preview->xoff * priv->extents.width / *width / zoom_factor;
src_y = priv->extents.y +
gimp_preview->yoff * priv->extents.height / *height / zoom_factor;
src_width = priv->extents.width / zoom_factor;
src_height = priv->extents.height / zoom_factor;
data = gimp_drawable_get_sub_thumbnail_data (drawable->drawable_id,
src_x, src_y,
src_width, src_height,
width, height, bpp);
return data;
}
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