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-rw-r--r--app/widgets/gimpviewrendererdrawable.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/app/widgets/gimpviewrendererdrawable.c b/app/widgets/gimpviewrendererdrawable.c
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+++ b/app/widgets/gimpviewrendererdrawable.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpviewrendererdrawable.c
+ * Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
+ *
+ * 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 "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "widgets-types.h"
+
+#include "config/gimpcoreconfig.h"
+
+#include "core/gimp.h"
+#include "core/gimpasync.h"
+#include "core/gimpcancelable.h"
+#include "core/gimpdrawable.h"
+#include "core/gimpdrawable-preview.h"
+#include "core/gimpimage.h"
+#include "core/gimptempbuf.h"
+
+#include "gimpviewrendererdrawable.h"
+
+
+struct _GimpViewRendererDrawablePrivate
+{
+ GimpAsync *render_async;
+ GtkWidget *render_widget;
+ gint render_buf_x;
+ gint render_buf_y;
+ gboolean render_update;
+
+ gint prev_width;
+ gint prev_height;
+};
+
+
+/* local function prototypes */
+
+static void gimp_view_renderer_drawable_dispose (GObject *object);
+
+static void gimp_view_renderer_drawable_invalidate (GimpViewRenderer *renderer);
+static void gimp_view_renderer_drawable_render (GimpViewRenderer *renderer,
+ GtkWidget *widget);
+
+static void gimp_view_renderer_drawable_cancel_render (GimpViewRendererDrawable *renderdrawable);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpViewRendererDrawable,
+ gimp_view_renderer_drawable,
+ GIMP_TYPE_VIEW_RENDERER)
+
+#define parent_class gimp_view_renderer_drawable_parent_class
+
+
+/* private functions */
+
+
+static void
+gimp_view_renderer_drawable_class_init (GimpViewRendererDrawableClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpViewRendererClass *renderer_class = GIMP_VIEW_RENDERER_CLASS (klass);
+
+ object_class->dispose = gimp_view_renderer_drawable_dispose;
+
+ renderer_class->invalidate = gimp_view_renderer_drawable_invalidate;
+ renderer_class->render = gimp_view_renderer_drawable_render;
+}
+
+static void
+gimp_view_renderer_drawable_init (GimpViewRendererDrawable *renderdrawable)
+{
+ renderdrawable->priv =
+ gimp_view_renderer_drawable_get_instance_private (renderdrawable);
+}
+
+static void
+gimp_view_renderer_drawable_dispose (GObject *object)
+{
+ GimpViewRendererDrawable *renderdrawable = GIMP_VIEW_RENDERER_DRAWABLE (object);
+
+ gimp_view_renderer_drawable_cancel_render (renderdrawable);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_view_renderer_drawable_invalidate (GimpViewRenderer *renderer)
+{
+ GimpViewRendererDrawable *renderdrawable = GIMP_VIEW_RENDERER_DRAWABLE (renderer);
+
+ gimp_view_renderer_drawable_cancel_render (renderdrawable);
+
+ GIMP_VIEW_RENDERER_CLASS (parent_class)->invalidate (renderer);
+}
+
+static void
+gimp_view_renderer_drawable_render_async_callback (GimpAsync *async,
+ GimpViewRendererDrawable *renderdrawable)
+{
+ GtkWidget *widget;
+
+ /* rendering was canceled, and the view renderer is potentially dead (see
+ * gimp_view_renderer_drawable_cancel_render()). bail.
+ */
+ if (gimp_async_is_canceled (async))
+ return;
+
+ widget = renderdrawable->priv->render_widget;
+
+ renderdrawable->priv->render_async = NULL;
+ renderdrawable->priv->render_widget = NULL;
+
+ if (gimp_async_is_finished (async))
+ {
+ GimpViewRenderer *renderer = GIMP_VIEW_RENDERER (renderdrawable);
+ GimpTempBuf *render_buf = gimp_async_get_result (async);
+
+ gimp_view_renderer_render_temp_buf (
+ renderer,
+ widget,
+ render_buf,
+ renderdrawable->priv->render_buf_x,
+ renderdrawable->priv->render_buf_y,
+ -1,
+ GIMP_VIEW_BG_CHECKS,
+ GIMP_VIEW_BG_CHECKS);
+
+ if (renderdrawable->priv->render_update)
+ gimp_view_renderer_update (renderer);
+ }
+
+ g_object_unref (widget);
+}
+
+static void
+gimp_view_renderer_drawable_render (GimpViewRenderer *renderer,
+ GtkWidget *widget)
+{
+ GimpViewRendererDrawable *renderdrawable = GIMP_VIEW_RENDERER_DRAWABLE (renderer);
+ GimpDrawable *drawable;
+ GimpItem *item;
+ GimpImage *image;
+ const gchar *icon_name;
+ GimpAsync *async;
+ gint image_width;
+ gint image_height;
+ gint view_width;
+ gint view_height;
+ gint src_x;
+ gint src_y;
+ gint src_width;
+ gint src_height;
+ gint dst_x;
+ gint dst_y;
+ gint dst_width;
+ gint dst_height;
+ gdouble xres = 1.0;
+ gdouble yres = 1.0;
+ gboolean empty = FALSE;
+
+ /* render is already in progress */
+ if (renderdrawable->priv->render_async)
+ return;
+
+ drawable = GIMP_DRAWABLE (renderer->viewable);
+ item = GIMP_ITEM (drawable);
+ image = gimp_item_get_image (item);
+ icon_name = gimp_viewable_get_icon_name (renderer->viewable);
+
+ if (image && ! image->gimp->config->layer_previews)
+ {
+ renderdrawable->priv->prev_width = 0;
+ renderdrawable->priv->prev_height = 0;
+
+ gimp_view_renderer_render_icon (renderer, widget, icon_name);
+
+ return;
+ }
+
+ if (image)
+ gimp_image_get_resolution (image, &xres, &yres);
+
+ if (renderer->is_popup)
+ image = NULL;
+
+ if (image)
+ {
+ image_width = gimp_image_get_width (image);
+ image_height = gimp_image_get_height (image);
+ }
+ else
+ {
+ image_width = gimp_item_get_width (item);
+ image_height = gimp_item_get_height (item);
+ }
+
+ gimp_viewable_calc_preview_size (image_width,
+ image_height,
+ renderer->width,
+ renderer->height,
+ renderer->dot_for_dot,
+ xres,
+ yres,
+ &view_width,
+ &view_height,
+ NULL);
+
+ src_x = 0;
+ src_y = 0;
+ src_width = gimp_item_get_width (item);
+ src_height = gimp_item_get_height (item);
+
+ if (image)
+ {
+ gint offset_x;
+ gint offset_y;
+
+ gimp_item_get_offset (item, &offset_x, &offset_y);
+
+ if (gimp_rectangle_intersect (src_x, src_y,
+ src_width, src_height,
+ -offset_x, -offset_y,
+ image_width, image_height,
+ &src_x, &src_y,
+ &src_width, &src_height))
+ {
+ offset_x += src_x;
+ offset_y += src_y;
+
+ dst_x = ROUND (((gdouble) view_width / image_width) *
+ offset_x);
+ dst_y = ROUND (((gdouble) view_height / image_height) *
+ offset_y);
+ dst_width = ROUND (((gdouble) view_width / image_width) *
+ src_width);
+ dst_height = ROUND (((gdouble) view_height / image_height) *
+ src_height);
+ }
+ else
+ {
+ dst_x = 0;
+ dst_y = 0;
+ dst_width = 1;
+ dst_height = 1;
+
+ empty = TRUE;
+ }
+ }
+ else
+ {
+ dst_x = (renderer->width - view_width) / 2;
+ dst_y = (renderer->height - view_height) / 2;
+ dst_width = view_width;
+ dst_height = view_height;
+ }
+
+ dst_width = MAX (dst_width, 1);
+ dst_height = MAX (dst_height, 1);
+
+ if (! empty)
+ {
+ async = gimp_drawable_get_sub_preview_async (drawable,
+ src_x, src_y,
+ src_width, src_height,
+ dst_width, dst_height);
+ }
+ else
+ {
+ const Babl *format = gimp_drawable_get_preview_format (drawable);
+ GimpTempBuf *render_buf;
+
+ async = gimp_async_new ();
+
+ render_buf = gimp_temp_buf_new (dst_width, dst_height, format);
+ gimp_temp_buf_data_clear (render_buf);
+
+ gimp_async_finish_full (async,
+ render_buf,
+ (GDestroyNotify) gimp_temp_buf_unref);
+ }
+
+ if (async)
+ {
+ renderdrawable->priv->render_async = async;
+ renderdrawable->priv->render_widget = g_object_ref (widget);
+ renderdrawable->priv->render_buf_x = dst_x;
+ renderdrawable->priv->render_buf_y = dst_y;
+ renderdrawable->priv->render_update = FALSE;
+
+ gimp_async_add_callback_for_object (
+ async,
+ (GimpAsyncCallback) gimp_view_renderer_drawable_render_async_callback,
+ renderdrawable,
+ renderdrawable);
+
+ /* if rendering isn't done yet, update the render-view once it is, and
+ * either keep the old drawable preview for now, or, if size changed (or
+ * there's no old preview,) render an icon in the meantime.
+ */
+ if (renderdrawable->priv->render_async)
+ {
+ renderdrawable->priv->render_update = TRUE;
+
+ if (renderer->width != renderdrawable->priv->prev_width ||
+ renderer->height != renderdrawable->priv->prev_height)
+ {
+ gimp_view_renderer_render_icon (renderer, widget, icon_name);
+ }
+ }
+
+ renderdrawable->priv->prev_width = renderer->width;
+ renderdrawable->priv->prev_height = renderer->height;
+
+ g_object_unref (async);
+ }
+ else
+ {
+ renderdrawable->priv->prev_width = 0;
+ renderdrawable->priv->prev_height = 0;
+
+ gimp_view_renderer_render_icon (renderer, widget, icon_name);
+ }
+}
+
+static void
+gimp_view_renderer_drawable_cancel_render (GimpViewRendererDrawable *renderdrawable)
+{
+ /* cancel the async render operation (if one is ongoing) without actually
+ * waiting for it. if the actual rendering hasn't started yet, it will be
+ * immediately aborted; otherwise, it can't really be interrupted, so we just
+ * let it go on without blocking the main thread.
+ * gimp_drawable_get_sub_preview_async() can continue rendering safely even
+ * after the drawable had died, and our completion callback is prepared to
+ * handle cancellation.
+ */
+ if (renderdrawable->priv->render_async)
+ {
+ gimp_cancelable_cancel (
+ GIMP_CANCELABLE (renderdrawable->priv->render_async));
+
+ renderdrawable->priv->render_async = NULL;
+ }
+
+ g_clear_object (&renderdrawable->priv->render_widget);
+}