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-rw-r--r--app/widgets/gimpviewrenderer-frame.c293
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diff --git a/app/widgets/gimpviewrenderer-frame.c b/app/widgets/gimpviewrenderer-frame.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpviewrenderer-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 "libgimpwidgets/gimpwidgets.h"
+
+#include "widgets-types.h"
+
+#include "core/gimpviewable.h"
+
+#include "gimpviewrenderer.h"
+#include "gimpviewrenderer-frame.h"
+#include "gimpwidgets-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 *
+gimp_view_renderer_get_frame (GimpViewRenderer *renderer,
+ gint width,
+ gint height)
+{
+ GimpViewRendererClass *class = GIMP_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
+gimp_view_renderer_ensure_frame (GimpViewRenderer *renderer,
+ GtkWidget *widget)
+{
+ GimpViewRendererClass *class = GIMP_VIEW_RENDERER_GET_CLASS (renderer);
+
+ if (! class->frame)
+ {
+ class->frame = gimp_widget_load_icon (widget, GIMP_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 *
+gimp_view_renderer_get_frame_pixbuf (GimpViewRenderer *renderer,
+ GtkWidget *widget,
+ gint width,
+ gint height)
+{
+ GimpViewRendererClass *class;
+ GdkPixbuf *frame;
+ GdkPixbuf *pixbuf;
+ gint w, h;
+ gint x, y;
+
+ g_return_val_if_fail (GIMP_IS_VIEW_RENDERER (renderer), NULL);
+ g_return_val_if_fail (GIMP_IS_VIEWABLE (renderer->viewable), NULL);
+
+ gimp_view_renderer_ensure_frame (renderer, widget);
+
+ class = GIMP_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 = gimp_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 = gimp_view_renderer_get_frame (renderer,
+ w + x + class->frame_right,
+ h + y + class->frame_bottom);
+ }
+ else
+ {
+ pixbuf = gimp_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 GimpThumbBox needs these values so
+ * it can request the GimpImageFile view in the proper size.
+ */
+void
+gimp_view_renderer_get_frame_size (gint *horizontal,
+ gint *vertical)
+{
+ GimpViewRendererClass *class;
+
+ class = g_type_class_ref (GIMP_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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