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gimp/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 <http://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 (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;
g_type_class_add_private (klass, sizeof (GimpViewRendererDrawablePrivate));
}
static void
gimp_view_renderer_drawable_init (GimpViewRendererDrawable *renderdrawable)
{
renderdrawable->priv =
G_TYPE_INSTANCE_GET_PRIVATE (renderdrawable,
GIMP_TYPE_VIEW_RENDERER_DRAWABLE,
GimpViewRendererDrawablePrivate);
}
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 offset_x;
gint offset_y;
gint width;
gint height;
gint view_width;
gint view_height;
gdouble xres = 1.0;
gdouble yres = 1.0;
gboolean scaling_up;
/* 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;
}
gimp_item_get_offset (item, &offset_x, &offset_y);
width = renderer->width;
height = renderer->height;
if (image)
gimp_image_get_resolution (image, &xres, &yres);
if (image && ! renderer->is_popup)
{
width = MAX (1, ROUND ((((gdouble) width /
(gdouble) gimp_image_get_width (image)) *
(gdouble) gimp_item_get_width (item))));
height = MAX (1, ROUND ((((gdouble) height /
(gdouble) gimp_image_get_height (image)) *
(gdouble) gimp_item_get_height (item))));
gimp_viewable_calc_preview_size (gimp_item_get_width (item),
gimp_item_get_height (item),
width,
height,
renderer->dot_for_dot,
xres,
yres,
&view_width,
&view_height,
&scaling_up);
}
else
{
gimp_viewable_calc_preview_size (gimp_item_get_width (item),
gimp_item_get_height (item),
width,
height,
renderer->dot_for_dot,
xres,
yres,
&view_width,
&view_height,
&scaling_up);
}
if ((view_width * view_height) <
(gimp_item_get_width (item) * gimp_item_get_height (item) * 4))
scaling_up = FALSE;
if (scaling_up && image && ! renderer->is_popup)
{
gint src_x, src_y;
gint src_width, src_height;
if (gimp_rectangle_intersect (0, 0,
gimp_item_get_width (item),
gimp_item_get_height (item),
-offset_x, -offset_y,
gimp_image_get_width (image),
gimp_image_get_height (image),
&src_x, &src_y,
&src_width, &src_height))
{
gint dest_width;
gint dest_height;
dest_width = ROUND (((gdouble) renderer->width /
(gdouble) gimp_image_get_width (image)) *
(gdouble) src_width);
dest_height = ROUND (((gdouble) renderer->height /
(gdouble) gimp_image_get_height (image)) *
(gdouble) src_height);
if (dest_width < 1) dest_width = 1;
if (dest_height < 1) dest_height = 1;
async = gimp_drawable_get_sub_preview_async (drawable,
src_x, src_y,
src_width, src_height,
dest_width, dest_height);
}
else
{
const Babl *format = gimp_drawable_get_preview_format (drawable);
GimpTempBuf *render_buf;
render_buf = gimp_temp_buf_new (1, 1, format);
gimp_temp_buf_data_clear (render_buf);
async = gimp_async_new ();
gimp_async_finish_full (async,
render_buf,
(GDestroyNotify) gimp_temp_buf_unref);
}
}
else
{
async = gimp_drawable_get_sub_preview_async (drawable,
0, 0,
gimp_item_get_width (item),
gimp_item_get_height (item),
view_width, view_height);
}
if (async)
{
gint render_buf_x = 0;
gint render_buf_y = 0;
if (image && ! renderer->is_popup)
{
if (offset_x != 0)
render_buf_x =
ROUND ((((gdouble) renderer->width /
(gdouble) gimp_image_get_width (image)) *
(gdouble) offset_x));
if (offset_y != 0)
render_buf_y =
ROUND ((((gdouble) renderer->height /
(gdouble) gimp_image_get_height (image)) *
(gdouble) offset_y));
if (scaling_up)
{
if (render_buf_x < 0) render_buf_x = 0;
if (render_buf_y < 0) render_buf_y = 0;
}
}
else
{
if (view_width < width)
render_buf_x = (width - view_width) / 2;
if (view_height < height)
render_buf_y = (height - view_height) / 2;
}
renderdrawable->priv->render_async = async;
renderdrawable->priv->render_widget = g_object_ref (widget);
renderdrawable->priv->render_buf_x = render_buf_x;
renderdrawable->priv->render_buf_y = render_buf_y;
renderdrawable->priv->render_update = FALSE;
gimp_async_add_callback (
async,
(GimpAsyncCallback) gimp_view_renderer_drawable_render_async_callback,
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 (view_width != renderdrawable->priv->prev_width ||
view_height != renderdrawable->priv->prev_height)
{
gimp_view_renderer_render_icon (renderer, widget, icon_name);
}
}
renderdrawable->priv->prev_width = view_width;
renderdrawable->priv->prev_height = view_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 cancelation.
*/
g_clear_pointer (&renderdrawable->priv->render_async, gimp_cancelable_cancel);
g_clear_object (&renderdrawable->priv->render_widget);
}
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