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gimp/app/display/gimpcanvasbufferpreview.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvasbufferpreview.c
* Copyright (C) 2013 Marek Dvoroznak <dvoromar@gmail.com>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include <cairo/cairo.h>
#include "libgimpbase/gimpbase.h"
#include "display/display-types.h"
#include "gimpcanvas.h"
#include "gimpcanvasbufferpreview.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-scroll.h"
enum
{
PROP_0,
PROP_BUFFER
};
typedef struct _GimpCanvasBufferPreviewPrivate GimpCanvasBufferPreviewPrivate;
struct _GimpCanvasBufferPreviewPrivate
{
GeglBuffer *buffer;
};
#define GET_PRIVATE(transform_preview) \
G_TYPE_INSTANCE_GET_PRIVATE (transform_preview, \
GIMP_TYPE_CANVAS_BUFFER_PREVIEW, \
GimpCanvasBufferPreviewPrivate)
/* local function prototypes */
static void gimp_canvas_buffer_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_buffer_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_buffer_preview_draw (GimpCanvasItem *item,
cairo_t *cr);
static cairo_region_t * gimp_canvas_buffer_preview_get_extents (GimpCanvasItem *item);
static void gimp_canvas_buffer_preview_compute_bounds (GimpCanvasItem *item,
cairo_rectangle_int_t *bounds);
G_DEFINE_TYPE (GimpCanvasBufferPreview, gimp_canvas_buffer_preview,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_buffer_preview_parent_class
static void
gimp_canvas_buffer_preview_class_init (GimpCanvasBufferPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->set_property = gimp_canvas_buffer_preview_set_property;
object_class->get_property = gimp_canvas_buffer_preview_get_property;
item_class->draw = gimp_canvas_buffer_preview_draw;
item_class->get_extents = gimp_canvas_buffer_preview_get_extents;
g_object_class_install_property (object_class, PROP_BUFFER,
g_param_spec_object ("buffer",
NULL, NULL,
GEGL_TYPE_BUFFER,
GIMP_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GimpCanvasBufferPreviewPrivate));
}
static void
gimp_canvas_buffer_preview_init (GimpCanvasBufferPreview *transform_preview)
{
}
static void
gimp_canvas_buffer_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_BUFFER:
private->buffer = g_value_get_object (value); /* don't ref */
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_buffer_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_BUFFER:
g_value_set_object (value, private->buffer);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_buffer_preview_draw (GimpCanvasItem *item,
cairo_t *cr)
{
GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
GeglBuffer *buffer = GET_PRIVATE (item)->buffer;
cairo_surface_t *area;
guchar *data;
cairo_rectangle_int_t rectangle;
gint viewport_offset_x, viewport_offset_y;
gint viewport_width, viewport_height;
g_return_if_fail (GEGL_IS_BUFFER (buffer));
gimp_display_shell_scroll_get_scaled_viewport (shell,
&viewport_offset_x,
&viewport_offset_y,
&viewport_width,
&viewport_height);
gimp_canvas_buffer_preview_compute_bounds (item, &rectangle);
area = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
rectangle.width,
rectangle.height);
data = cairo_image_surface_get_data (area);
gegl_buffer_get (buffer,
GEGL_RECTANGLE ((viewport_offset_x < 0 ? 0 : viewport_offset_x),
(viewport_offset_y < 0 ? 0 : viewport_offset_y),
rectangle.width,
rectangle.height),
shell->scale_x,
babl_format ("cairo-ARGB32"),
data,
cairo_image_surface_get_stride (area),
GEGL_ABYSS_NONE);
cairo_surface_flush (area);
cairo_surface_mark_dirty (area);
cairo_set_source_surface (cr, area, rectangle.x, rectangle.y);
cairo_rectangle (cr,
rectangle.x, rectangle.y,
rectangle.width, rectangle.height);
cairo_fill (cr);
cairo_surface_destroy (area);
}
static void
gimp_canvas_buffer_preview_compute_bounds (GimpCanvasItem *item,
cairo_rectangle_int_t *bounds)
{
GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
GeglBuffer *buffer = GET_PRIVATE (item)->buffer;
gint x_from, x_to;
gint y_from, y_to;
gint viewport_offset_x, viewport_offset_y;
gint viewport_width, viewport_height;
gint width, height;
g_return_if_fail (GEGL_IS_BUFFER (buffer));
width = gegl_buffer_get_width (buffer);
height = gegl_buffer_get_height (buffer);
gimp_display_shell_scroll_get_scaled_viewport (shell,
&viewport_offset_x,
&viewport_offset_y,
&viewport_width,
&viewport_height);
x_from = (viewport_offset_x < 0 ? -viewport_offset_x : 0);
y_from = (viewport_offset_y < 0 ? -viewport_offset_y : 0);
x_to = width * shell->scale_x - viewport_offset_x;
if (x_to > viewport_width)
x_to = viewport_width;
y_to = height * shell->scale_y - viewport_offset_y;
if (y_to > viewport_height)
y_to = viewport_height;
bounds->x = x_from;
bounds->y = y_from;
bounds->width = x_to - x_from;
bounds->height = y_to - y_from;
}
static cairo_region_t *
gimp_canvas_buffer_preview_get_extents (GimpCanvasItem *item)
{
cairo_rectangle_int_t rectangle;
gimp_canvas_buffer_preview_compute_bounds (item, &rectangle);
return cairo_region_create_rectangle (&rectangle);
}
GimpCanvasItem *
gimp_canvas_buffer_preview_new (GimpDisplayShell *shell,
GeglBuffer *buffer)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
return g_object_new (GIMP_TYPE_CANVAS_BUFFER_PREVIEW,
"shell", shell,
"buffer", buffer,
NULL);
}
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