298 lines
10 KiB
C
298 lines
10 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaviewrenderer-frame.c
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* Copyright (C) 2004 Sven Neumann <sven@gimp.org>
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*
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* Contains code taken from eel, the Eazel Extensions Library.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikawidgets/pikawidgets.h"
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#include "widgets-types.h"
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#include "core/pikaviewable.h"
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#include "pikaviewrenderer.h"
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#include "pikaviewrenderer-frame.h"
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#include "pikawidgets-utils.h"
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/* utility to stretch a frame to the desired size */
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static void
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draw_frame_row (GdkPixbuf *frame_image,
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gint target_width,
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gint source_width,
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gint source_v_position,
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gint dest_v_position,
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GdkPixbuf *result_pixbuf,
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gint left_offset,
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gint height)
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{
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gint remaining_width = target_width;
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gint h_offset = 0;
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while (remaining_width > 0)
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{
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gint slab_width = (remaining_width > source_width ?
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source_width : remaining_width);
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gdk_pixbuf_copy_area (frame_image,
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left_offset, source_v_position,
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slab_width, height,
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result_pixbuf,
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left_offset + h_offset, dest_v_position);
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remaining_width -= slab_width;
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h_offset += slab_width;
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}
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}
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/* utility to draw the middle section of the frame in a loop */
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static void
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draw_frame_column (GdkPixbuf *frame_image,
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gint target_height,
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gint source_height,
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gint source_h_position,
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gint dest_h_position,
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GdkPixbuf *result_pixbuf,
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gint top_offset, int width)
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{
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gint remaining_height = target_height;
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gint v_offset = 0;
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while (remaining_height > 0)
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{
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gint slab_height = (remaining_height > source_height ?
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source_height : remaining_height);
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gdk_pixbuf_copy_area (frame_image,
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source_h_position, top_offset,
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width, slab_height,
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result_pixbuf,
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dest_h_position, top_offset + v_offset);
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remaining_height -= slab_height;
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v_offset += slab_height;
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}
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}
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static GdkPixbuf *
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stretch_frame_image (GdkPixbuf *frame_image,
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gint left_offset,
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gint top_offset,
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gint right_offset,
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gint bottom_offset,
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gint dest_width,
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gint dest_height)
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{
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GdkPixbuf *pixbuf;
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gint frame_width, frame_height;
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gint target_width, target_frame_width;
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gint target_height, target_frame_height;
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frame_width = gdk_pixbuf_get_width (frame_image);
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frame_height = gdk_pixbuf_get_height (frame_image );
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pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
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dest_width, dest_height);
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gdk_pixbuf_fill (pixbuf, 0);
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target_width = dest_width - left_offset - right_offset;
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target_height = dest_height - top_offset - bottom_offset;
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target_frame_width = frame_width - left_offset - right_offset;
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target_frame_height = frame_height - top_offset - bottom_offset;
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left_offset += MIN (target_width / 4, target_frame_width / 4);
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right_offset += MIN (target_width / 4, target_frame_width / 4);
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top_offset += MIN (target_height / 4, target_frame_height / 4);
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bottom_offset += MIN (target_height / 4, target_frame_height / 4);
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target_width = dest_width - left_offset - right_offset;
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target_height = dest_height - top_offset - bottom_offset;
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target_frame_width = frame_width - left_offset - right_offset;
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target_frame_height = frame_height - top_offset - bottom_offset;
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/* draw the left top corner and top row */
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gdk_pixbuf_copy_area (frame_image,
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0, 0, left_offset, top_offset,
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pixbuf, 0, 0);
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draw_frame_row (frame_image, target_width, target_frame_width,
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0, 0,
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pixbuf,
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left_offset, top_offset);
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/* draw the right top corner and left column */
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gdk_pixbuf_copy_area (frame_image,
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frame_width - right_offset, 0,
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right_offset, top_offset,
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pixbuf,
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dest_width - right_offset, 0);
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draw_frame_column (frame_image, target_height, target_frame_height, 0, 0,
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pixbuf, top_offset, left_offset);
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/* draw the bottom right corner and bottom row */
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gdk_pixbuf_copy_area (frame_image,
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frame_width - right_offset, frame_height - bottom_offset,
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right_offset, bottom_offset,
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pixbuf,
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dest_width - right_offset, dest_height - bottom_offset);
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draw_frame_row (frame_image, target_width, target_frame_width,
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frame_height - bottom_offset, dest_height - bottom_offset,
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pixbuf, left_offset, bottom_offset);
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/* draw the bottom left corner and the right column */
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gdk_pixbuf_copy_area (frame_image,
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0, frame_height - bottom_offset,
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left_offset, bottom_offset,
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pixbuf,
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0, dest_height - bottom_offset);
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draw_frame_column (frame_image, target_height, target_frame_height,
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frame_width - right_offset, dest_width - right_offset,
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pixbuf, top_offset, right_offset);
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return pixbuf;
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}
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static GdkPixbuf *
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pika_view_renderer_get_frame (PikaViewRenderer *renderer,
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gint width,
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gint height)
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{
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PikaViewRendererClass *class = PIKA_VIEW_RENDERER_GET_CLASS (renderer);
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return stretch_frame_image (class->frame,
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class->frame_left,
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class->frame_top,
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class->frame_right,
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class->frame_bottom,
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width, height);
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}
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static void
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pika_view_renderer_ensure_frame (PikaViewRenderer *renderer,
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GtkWidget *widget)
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{
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PikaViewRendererClass *class = PIKA_VIEW_RENDERER_GET_CLASS (renderer);
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if (! class->frame)
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{
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class->frame = pika_widget_load_icon (widget, PIKA_ICON_FRAME, 48);
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/* FIXME: shouldn't be hardcoded */
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class->frame_left = 2;
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class->frame_top = 2;
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class->frame_right = 4;
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class->frame_bottom = 4;
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}
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}
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GdkPixbuf *
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pika_view_renderer_get_frame_pixbuf (PikaViewRenderer *renderer,
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GtkWidget *widget,
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gint width,
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gint height)
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{
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PikaViewRendererClass *class;
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GdkPixbuf *frame;
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GdkPixbuf *pixbuf;
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gint w, h;
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gint x, y;
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g_return_val_if_fail (PIKA_IS_VIEW_RENDERER (renderer), NULL);
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g_return_val_if_fail (PIKA_IS_VIEWABLE (renderer->viewable), NULL);
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pika_view_renderer_ensure_frame (renderer, widget);
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class = PIKA_VIEW_RENDERER_GET_CLASS (renderer);
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w = width - class->frame_left - class->frame_right;
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h = height - class->frame_top - class->frame_bottom;
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if (w > 12 && h > 12)
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{
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pixbuf = pika_viewable_get_pixbuf (renderer->viewable,
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renderer->context,
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w, h);
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if (!pixbuf)
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return NULL;
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x = class->frame_left;
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y = class->frame_top;
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w = gdk_pixbuf_get_width (pixbuf);
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h = gdk_pixbuf_get_height (pixbuf);
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frame = pika_view_renderer_get_frame (renderer,
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w + x + class->frame_right,
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h + y + class->frame_bottom);
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}
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else
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{
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pixbuf = pika_viewable_get_pixbuf (renderer->viewable,
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renderer->context,
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width - 2, height - 2);
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if (!pixbuf)
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return NULL;
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/* as fallback, render the preview with a 1 pixel wide black border */
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x = 1;
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y = 1;
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w = gdk_pixbuf_get_width (pixbuf);
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h = gdk_pixbuf_get_height (pixbuf);
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frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, w + 2, h + 2);
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gdk_pixbuf_fill (frame, 0);
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}
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gdk_pixbuf_copy_area (pixbuf, 0, 0, w, h, frame, x, y);
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return frame;
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}
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/* This API is somewhat weird but PikaThumbBox needs these values so
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* it can request the PikaImageFile view in the proper size.
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*/
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void
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pika_view_renderer_get_frame_size (gint *horizontal,
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gint *vertical)
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{
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PikaViewRendererClass *class;
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class = g_type_class_ref (PIKA_TYPE_VIEW_RENDERER);
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if (horizontal)
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*horizontal = class->frame_left + class->frame_right;
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if (vertical)
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*vertical = class->frame_top + class->frame_bottom;
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g_type_class_unref (class);
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}
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