PIKApp/app/display/pikacanvasbufferpreview.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikacanvasbufferpreview.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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include <cairo.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "display/display-types.h"
#include "core/pikaimage.h"
#include "pikacanvas.h"
#include "pikacanvasbufferpreview.h"
#include "pikadisplayshell.h"
#include "pikadisplayshell-scroll.h"
enum
{
PROP_0,
PROP_BUFFER
};
typedef struct _PikaCanvasBufferPreviewPrivate PikaCanvasBufferPreviewPrivate;
struct _PikaCanvasBufferPreviewPrivate
{
GeglBuffer *buffer;
};
#define GET_PRIVATE(transform_preview) \
((PikaCanvasBufferPreviewPrivate *) pika_canvas_buffer_preview_get_instance_private ((PikaCanvasBufferPreview *) (transform_preview)))
/* local function prototypes */
static void pika_canvas_buffer_preview_dispose (GObject *object);
static void pika_canvas_buffer_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_canvas_buffer_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_canvas_buffer_preview_draw (PikaCanvasItem *item,
cairo_t *cr);
static cairo_region_t * pika_canvas_buffer_preview_get_extents (PikaCanvasItem *item);
static void pika_canvas_buffer_preview_compute_bounds (PikaCanvasItem *item,
cairo_rectangle_int_t *bounds);
G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasBufferPreview, pika_canvas_buffer_preview,
PIKA_TYPE_CANVAS_ITEM)
#define parent_class pika_canvas_buffer_preview_parent_class
static void
pika_canvas_buffer_preview_class_init (PikaCanvasBufferPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
object_class->dispose = pika_canvas_buffer_preview_dispose;
object_class->set_property = pika_canvas_buffer_preview_set_property;
object_class->get_property = pika_canvas_buffer_preview_get_property;
item_class->draw = pika_canvas_buffer_preview_draw;
item_class->get_extents = pika_canvas_buffer_preview_get_extents;
g_object_class_install_property (object_class, PROP_BUFFER,
g_param_spec_object ("buffer",
NULL, NULL,
GEGL_TYPE_BUFFER,
PIKA_PARAM_READWRITE));
}
static void
pika_canvas_buffer_preview_init (PikaCanvasBufferPreview *transform_preview)
{
}
static void
pika_canvas_buffer_preview_dispose (GObject *object)
{
PikaCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
g_clear_object (&private->buffer);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_canvas_buffer_preview_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCanvasBufferPreviewPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_BUFFER:
g_set_object (&private->buffer, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_buffer_preview_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCanvasBufferPreviewPrivate *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
pika_canvas_buffer_preview_draw (PikaCanvasItem *item,
cairo_t *cr)
{
PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
GeglBuffer *buffer = GET_PRIVATE (item)->buffer;
cairo_surface_t *area;
guchar *data;
cairo_rectangle_int_t rectangle;
g_return_if_fail (GEGL_IS_BUFFER (buffer));
pika_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 (rectangle.x + shell->offset_x,
rectangle.y + shell->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
pika_canvas_buffer_preview_compute_bounds (PikaCanvasItem *item,
cairo_rectangle_int_t *bounds)
{
PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
GeglBuffer *buffer = GET_PRIVATE (item)->buffer;
GeglRectangle extent;
gdouble x1, y1;
gdouble x2, y2;
g_return_if_fail (GEGL_IS_BUFFER (buffer));
extent = *gegl_buffer_get_extent (buffer);
pika_canvas_item_transform_xy_f (item,
extent.x,
extent.y,
&x1, &y1);
pika_canvas_item_transform_xy_f (item,
extent.x + extent.width,
extent.y + extent.height,
&x2, &y2);
extent.x = floor (x1);
extent.y = floor (y1);
extent.width = ceil (x2) - extent.x;
extent.height = ceil (y2) - extent.y;
gegl_rectangle_intersect (&extent,
&extent,
GEGL_RECTANGLE (0,
0,
shell->disp_width,
shell->disp_height));
bounds->x = extent.x;
bounds->y = extent.y;
bounds->width = extent.width;
bounds->height = extent.height;
}
static cairo_region_t *
pika_canvas_buffer_preview_get_extents (PikaCanvasItem *item)
{
cairo_rectangle_int_t rectangle;
pika_canvas_buffer_preview_compute_bounds (item, &rectangle);
return cairo_region_create_rectangle (&rectangle);
}
PikaCanvasItem *
pika_canvas_buffer_preview_new (PikaDisplayShell *shell,
GeglBuffer *buffer)
{
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
return g_object_new (PIKA_TYPE_CANVAS_BUFFER_PREVIEW,
"shell", shell,
"buffer", buffer,
NULL);
}