AlderconeStudio/PIKApp
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PIKApp
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PIKApp/app/widgets/pikaviewrenderer-frame.c

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/* 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
*
* pikaviewrenderer-frame.c
* Copyright (C) 2004 Sven Neumann <sven@gimp.org>
*
* Contains code taken from eel, the Eazel Extensions Library.
*
* 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 "libpikawidgets/pikawidgets.h"
#include "widgets-types.h"
#include "core/pikaviewable.h"
#include "pikaviewrenderer.h"
#include "pikaviewrenderer-frame.h"
#include "pikawidgets-utils.h"
/* utility to stretch a frame to the desired size */
static void
draw_frame_row (GdkPixbuf *frame_image,
gint target_width,
gint source_width,
gint source_v_position,
gint dest_v_position,
GdkPixbuf *result_pixbuf,
gint left_offset,
gint height)
{
gint remaining_width = target_width;
gint h_offset = 0;
while (remaining_width > 0)
{
gint slab_width = (remaining_width > source_width ?
source_width : remaining_width);
gdk_pixbuf_copy_area (frame_image,
left_offset, source_v_position,
slab_width, height,
result_pixbuf,
left_offset + h_offset, dest_v_position);
remaining_width -= slab_width;
h_offset += slab_width;
}
}
/* utility to draw the middle section of the frame in a loop */
static void
draw_frame_column (GdkPixbuf *frame_image,
gint target_height,
gint source_height,
gint source_h_position,
gint dest_h_position,
GdkPixbuf *result_pixbuf,
gint top_offset, int width)
{
gint remaining_height = target_height;
gint v_offset = 0;
while (remaining_height > 0)
{
gint slab_height = (remaining_height > source_height ?
source_height : remaining_height);
gdk_pixbuf_copy_area (frame_image,
source_h_position, top_offset,
width, slab_height,
result_pixbuf,
dest_h_position, top_offset + v_offset);
remaining_height -= slab_height;
v_offset += slab_height;
}
}
static GdkPixbuf *
stretch_frame_image (GdkPixbuf *frame_image,
gint left_offset,
gint top_offset,
gint right_offset,
gint bottom_offset,
gint dest_width,
gint dest_height)
{
GdkPixbuf *pixbuf;
gint frame_width, frame_height;
gint target_width, target_frame_width;
gint target_height, target_frame_height;
frame_width = gdk_pixbuf_get_width (frame_image);
frame_height = gdk_pixbuf_get_height (frame_image );
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
dest_width, dest_height);
gdk_pixbuf_fill (pixbuf, 0);
target_width = dest_width - left_offset - right_offset;
target_height = dest_height - top_offset - bottom_offset;
target_frame_width = frame_width - left_offset - right_offset;
target_frame_height = frame_height - top_offset - bottom_offset;
left_offset += MIN (target_width / 4, target_frame_width / 4);
right_offset += MIN (target_width / 4, target_frame_width / 4);
top_offset += MIN (target_height / 4, target_frame_height / 4);
bottom_offset += MIN (target_height / 4, target_frame_height / 4);
target_width = dest_width - left_offset - right_offset;
target_height = dest_height - top_offset - bottom_offset;
target_frame_width = frame_width - left_offset - right_offset;
target_frame_height = frame_height - top_offset - bottom_offset;
/* draw the left top corner and top row */
gdk_pixbuf_copy_area (frame_image,
0, 0, left_offset, top_offset,
pixbuf, 0, 0);
draw_frame_row (frame_image, target_width, target_frame_width,
0, 0,
pixbuf,
left_offset, top_offset);
/* draw the right top corner and left column */
gdk_pixbuf_copy_area (frame_image,
frame_width - right_offset, 0,
right_offset, top_offset,
pixbuf,
dest_width - right_offset, 0);
draw_frame_column (frame_image, target_height, target_frame_height, 0, 0,
pixbuf, top_offset, left_offset);
/* draw the bottom right corner and bottom row */
gdk_pixbuf_copy_area (frame_image,
frame_width - right_offset, frame_height - bottom_offset,
right_offset, bottom_offset,
pixbuf,
dest_width - right_offset, dest_height - bottom_offset);
draw_frame_row (frame_image, target_width, target_frame_width,
frame_height - bottom_offset, dest_height - bottom_offset,
pixbuf, left_offset, bottom_offset);
/* draw the bottom left corner and the right column */
gdk_pixbuf_copy_area (frame_image,
0, frame_height - bottom_offset,
left_offset, bottom_offset,
pixbuf,
0, dest_height - bottom_offset);
draw_frame_column (frame_image, target_height, target_frame_height,
frame_width - right_offset, dest_width - right_offset,
pixbuf, top_offset, right_offset);
return pixbuf;
}
static GdkPixbuf *
pika_view_renderer_get_frame (PikaViewRenderer *renderer,
gint width,
gint height)
{
PikaViewRendererClass *class = PIKA_VIEW_RENDERER_GET_CLASS (renderer);
return stretch_frame_image (class->frame,
class->frame_left,
class->frame_top,
class->frame_right,
class->frame_bottom,
width, height);
}
static void
pika_view_renderer_ensure_frame (PikaViewRenderer *renderer,
GtkWidget *widget)
{
PikaViewRendererClass *class = PIKA_VIEW_RENDERER_GET_CLASS (renderer);
if (! class->frame)
{
class->frame = pika_widget_load_icon (widget, PIKA_ICON_FRAME, 48);
/* FIXME: shouldn't be hardcoded */
class->frame_left = 2;
class->frame_top = 2;
class->frame_right = 4;
class->frame_bottom = 4;
}
}
GdkPixbuf *
pika_view_renderer_get_frame_pixbuf (PikaViewRenderer *renderer,
GtkWidget *widget,
gint width,
gint height)
{
PikaViewRendererClass *class;
GdkPixbuf *frame;
GdkPixbuf *pixbuf;
gint w, h;
gint x, y;
g_return_val_if_fail (PIKA_IS_VIEW_RENDERER (renderer), NULL);
g_return_val_if_fail (PIKA_IS_VIEWABLE (renderer->viewable), NULL);
pika_view_renderer_ensure_frame (renderer, widget);
class = PIKA_VIEW_RENDERER_GET_CLASS (renderer);
w = width - class->frame_left - class->frame_right;
h = height - class->frame_top - class->frame_bottom;
if (w > 12 && h > 12)
{
pixbuf = pika_viewable_get_pixbuf (renderer->viewable,
renderer->context,
w, h);
if (!pixbuf)
return NULL;
x = class->frame_left;
y = class->frame_top;
w = gdk_pixbuf_get_width (pixbuf);
h = gdk_pixbuf_get_height (pixbuf);
frame = pika_view_renderer_get_frame (renderer,
w + x + class->frame_right,
h + y + class->frame_bottom);
}
else
{
pixbuf = pika_viewable_get_pixbuf (renderer->viewable,
renderer->context,
width - 2, height - 2);
if (!pixbuf)
return NULL;
/* as fallback, render the preview with a 1 pixel wide black border */
x = 1;
y = 1;
w = gdk_pixbuf_get_width (pixbuf);
h = gdk_pixbuf_get_height (pixbuf);
frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, w + 2, h + 2);
gdk_pixbuf_fill (frame, 0);
}
gdk_pixbuf_copy_area (pixbuf, 0, 0, w, h, frame, x, y);
return frame;
}
/* This API is somewhat weird but PikaThumbBox needs these values so
* it can request the PikaImageFile view in the proper size.
*/
void
pika_view_renderer_get_frame_size (gint *horizontal,
gint *vertical)
{
PikaViewRendererClass *class;
class = g_type_class_ref (PIKA_TYPE_VIEW_RENDERER);
if (horizontal)
*horizontal = class->frame_left + class->frame_right;
if (vertical)
*vertical = class->frame_top + class->frame_bottom;
g_type_class_unref (class);
}
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