diff options
Diffstat (limited to 'src/st/st-image-content.c')
| -rw-r--r-- | src/st/st-image-content.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/src/st/st-image-content.c b/src/st/st-image-content.c new file mode 100644 index 0000000..92f1c14 --- /dev/null +++ b/src/st/st-image-content.c @@ -0,0 +1,346 @@ +/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ +/* + * st-image-content.h: A content image with scaling support + * + * Copyright 2019 Canonical, Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as + * published by the Free Software Foundation, either version 2.1 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for + * more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "st-image-content.h" +#include "st-private.h" + +struct _StImageContent +{ + /*< private >*/ + ClutterImage parent_instance; +}; + +typedef struct _StImageContentPrivate StImageContentPrivate; +struct _StImageContentPrivate +{ + int width; + int height; +}; + +enum +{ + PROP_0, + PROP_PREFERRED_WIDTH, + PROP_PREFERRED_HEIGHT, +}; + +static void clutter_content_interface_init (ClutterContentInterface *iface); +static void g_icon_interface_init (GIconIface *iface); +static void g_loadable_icon_interface_init (GLoadableIconIface *iface); + +G_DEFINE_TYPE_WITH_CODE (StImageContent, st_image_content, CLUTTER_TYPE_IMAGE, + G_ADD_PRIVATE (StImageContent) + G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_CONTENT, + clutter_content_interface_init) + G_IMPLEMENT_INTERFACE (G_TYPE_ICON, + g_icon_interface_init) + G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON, + g_loadable_icon_interface_init)) + +static void +st_image_content_init (StImageContent *self) +{ +} + +static void +st_image_content_constructed (GObject *object) +{ + StImageContent *self = ST_IMAGE_CONTENT (object); + StImageContentPrivate *priv = st_image_content_get_instance_private (self); + + if (priv->width < 0 || priv->height < 0) + g_warning ("StImageContent initialized with invalid preferred size: %dx%d\n", + priv->width, priv->height); +} + +static void +st_image_content_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + StImageContent *self = ST_IMAGE_CONTENT (object); + StImageContentPrivate *priv = st_image_content_get_instance_private (self); + + switch (prop_id) + { + case PROP_PREFERRED_WIDTH: + g_value_set_int (value, priv->width); + break; + + case PROP_PREFERRED_HEIGHT: + g_value_set_int (value, priv->height); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +st_image_content_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + StImageContent *self = ST_IMAGE_CONTENT (object); + StImageContentPrivate *priv = st_image_content_get_instance_private (self); + + switch (prop_id) + { + case PROP_PREFERRED_WIDTH: + priv->width = g_value_get_int (value); + break; + + case PROP_PREFERRED_HEIGHT: + priv->height = g_value_get_int (value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +st_image_content_class_init (StImageContentClass *klass) +{ + GParamSpec *pspec; + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + object_class->constructed = st_image_content_constructed; + object_class->get_property = st_image_content_get_property; + object_class->set_property = st_image_content_set_property; + + pspec = g_param_spec_int ("preferred-width", + "Preferred Width", + "Preferred Width of the Content when painted", + -1, G_MAXINT, -1, + G_PARAM_CONSTRUCT_ONLY | ST_PARAM_READWRITE); + g_object_class_install_property (object_class, PROP_PREFERRED_WIDTH, pspec); + + pspec = g_param_spec_int ("preferred-height", + "Preferred Height", + "Preferred Height of the Content when painted", + -1, G_MAXINT, -1, + G_PARAM_CONSTRUCT_ONLY | ST_PARAM_READWRITE); + g_object_class_install_property (object_class, PROP_PREFERRED_HEIGHT, pspec); +} + +static gboolean +st_image_content_get_preferred_size (ClutterContent *content, + float *width, + float *height) +{ + StImageContent *self = ST_IMAGE_CONTENT (content); + StImageContentPrivate *priv = st_image_content_get_instance_private (self); + CoglTexture *texture; + + texture = clutter_image_get_texture (CLUTTER_IMAGE (content)); + + if (texture == NULL) + return FALSE; + + g_assert_cmpint (priv->width, >, -1); + g_assert_cmpint (priv->height, >, -1); + + if (width != NULL) + *width = (float) priv->width; + + if (height != NULL) + *height = (float) priv->height; + + return TRUE; +} + +static GdkPixbuf* +pixbuf_from_image (StImageContent *image) +{ + CoglTexture *texture; + int width, height, rowstride; + uint8_t *data; + + texture = clutter_image_get_texture (CLUTTER_IMAGE (image)); + if (!texture || !cogl_texture_is_get_data_supported (texture)) + return NULL; + + width = cogl_texture_get_width (texture); + height = cogl_texture_get_width (texture); + rowstride = 4 * width; + data = g_new (uint8_t, rowstride * height); + + cogl_texture_get_data (texture, COGL_PIXEL_FORMAT_RGBA_8888, rowstride, data); + + return gdk_pixbuf_new_from_data ((const guchar *)data, + GDK_COLORSPACE_RGB, + TRUE, 8, width, height, rowstride, + (GdkPixbufDestroyNotify)g_free, NULL); +} + +static void +clutter_content_interface_init (ClutterContentInterface *iface) +{ + iface->get_preferred_size = st_image_content_get_preferred_size; +} + +static guint +st_image_content_hash (GIcon *icon) +{ + return g_direct_hash (icon); +} + +static gboolean +st_image_content_equal (GIcon *icon1, + GIcon *icon2) +{ + return g_direct_equal (icon1, icon2); +} + +static GVariant * +st_image_content_serialize (GIcon *icon) +{ + g_autoptr (GdkPixbuf) pixbuf = NULL; + + pixbuf = pixbuf_from_image (ST_IMAGE_CONTENT (icon)); + if (!pixbuf) + return NULL; + + return g_icon_serialize (G_ICON (pixbuf)); +} + +static void +g_icon_interface_init (GIconIface *iface) +{ + iface->hash = st_image_content_hash; + iface->equal = st_image_content_equal; + iface->serialize = st_image_content_serialize; +} + +static GInputStream * +st_image_load (GLoadableIcon *icon, + int size, + char **type, + GCancellable *cancellable, + GError **error) +{ + g_autoptr (GdkPixbuf) pixbuf = NULL; + + pixbuf = pixbuf_from_image (ST_IMAGE_CONTENT (icon)); + if (!pixbuf) + { + g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED, + "Failed to read texture"); + return NULL; + } + + return g_loadable_icon_load (G_LOADABLE_ICON (pixbuf), + size, type, cancellable, error); +} + +static void +load_image_thread (GTask *task, + gpointer object, + gpointer task_data, + GCancellable *cancellable) +{ + GInputStream *stream; + GError *error = NULL; + char *type; + + stream = st_image_load (G_LOADABLE_ICON (object), + GPOINTER_TO_INT (task_data), + &type, + cancellable, + &error); + + if (error) + { + g_task_return_error (task, error); + } + else + { + g_task_set_task_data (task, type, g_free); + g_task_return_pointer (task, stream, g_object_unref); + } +} + +static void +st_image_load_async (GLoadableIcon *icon, + int size, + GCancellable *cancellable, + GAsyncReadyCallback callback, + gpointer user_data) +{ + g_autoptr (GTask) task = NULL; + + task = g_task_new (icon, cancellable, callback, user_data); + g_task_set_task_data (task, GINT_TO_POINTER (size), NULL); + g_task_run_in_thread (task, load_image_thread); +} + +static GInputStream * +st_image_load_finish (GLoadableIcon *icon, + GAsyncResult *res, + char **type, + GError **error) +{ + GInputStream *stream; + + stream = g_task_propagate_pointer (G_TASK (res), error); + if (!stream) + return NULL; + + if (type) + *type = g_strdup (g_task_get_task_data (G_TASK (res))); + + return stream; +} + +static void +g_loadable_icon_interface_init (GLoadableIconIface *iface) +{ + iface->load = st_image_load; + iface->load_async = st_image_load_async; + iface->load_finish = st_image_load_finish; +} + +/** + * st_image_content_new_with_preferred_size: + * @width: The preferred width to be used when drawing the content + * @height: The preferred width to be used when drawing the content + * + * Creates a new #StImageContent, a simple content for sized images. + * + * See #ClutterImage for setting the actual image to display or #StIcon for + * displaying icons. + * + * Returns: (transfer full): the newly created #StImageContent content + * Use g_object_unref() when done. + */ +ClutterContent * +st_image_content_new_with_preferred_size (int width, + int height) +{ + return g_object_new (ST_TYPE_IMAGE_CONTENT, + "preferred-width", width, + "preferred-height", height, + NULL); +} |