gtk2/gtk/gtkcssimagefallback.c

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/*
* Copyright © 2016 Red Hat Inc.
*
* This library 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 library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Matthias Clasen <mclasen@redhat.com>
*/
#include "config.h"
#include "gtkcssimagefallbackprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkstyleproviderprivate.h"
G_DEFINE_TYPE (GtkCssImageFallback, _gtk_css_image_fallback, GTK_TYPE_CSS_IMAGE)
static int
gtk_css_image_fallback_get_width (GtkCssImage *image)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
if (fallback->used < 0)
return 0;
return _gtk_css_image_get_width (fallback->images[fallback->used]);
}
static int
gtk_css_image_fallback_get_height (GtkCssImage *image)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
if (fallback->used < 0)
return 0;
return _gtk_css_image_get_height (fallback->images[fallback->used]);
}
static double
gtk_css_image_fallback_get_aspect_ratio (GtkCssImage *image)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
if (fallback->used < 0)
return 0;
return _gtk_css_image_get_aspect_ratio (fallback->images[fallback->used]);
}
static void
gtk_css_image_fallback_snapshot (GtkCssImage *image,
GtkSnapshot *snapshot,
double width,
double height)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
if (fallback->used < 0)
{
if (fallback->color)
{
const GdkRGBA *color = gtk_css_color_value_get_rgba (fallback->color);
if (!gdk_rgba_is_clear (color))
gtk_snapshot_append_color (snapshot, color,
&GRAPHENE_RECT_INIT (0, 0, width, height));
}
else
{
gtk_snapshot_append_color (snapshot, &(GdkRGBA) {1, 0, 0, 1},
&GRAPHENE_RECT_INIT (0, 0, width, height));
}
}
else
gtk_css_image_snapshot (fallback->images[fallback->used], snapshot, width, height);
}
static void
gtk_css_image_fallback_print (GtkCssImage *image,
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GString *string)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
int i;
g_string_append (string, "image(");
for (i = 0; i < fallback->n_images; i++)
{
if (i > 0)
g_string_append (string, ",");
_gtk_css_image_print (fallback->images[i], string);
}
if (fallback->color)
{
if (fallback->n_images > 0)
g_string_append (string, ",");
_gtk_css_value_print (fallback->color, string);
}
g_string_append (string, ")");
}
static void
gtk_css_image_fallback_dispose (GObject *object)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (object);
int i;
for (i = 0; i < fallback->n_images; i++)
g_object_unref (fallback->images[i]);
g_free (fallback->images);
fallback->images = NULL;
if (fallback->color)
{
_gtk_css_value_unref (fallback->color);
fallback->color = NULL;
}
G_OBJECT_CLASS (_gtk_css_image_fallback_parent_class)->dispose (object);
}
static GtkCssImage *
gtk_css_image_fallback_compute (GtkCssImage *image,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
GtkCssImageFallback *copy;
int i;
if (fallback->used < 0)
{
GtkCssValue *computed_color = NULL;
if (fallback->color)
computed_color= _gtk_css_value_compute (fallback->color,
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property_id,
provider,
style,
parent_style);
/* image($color) that didn't change */
if (computed_color && !fallback->images &&
computed_color == fallback->color)
return g_object_ref (image);
copy = g_object_new (_gtk_css_image_fallback_get_type (), NULL);
copy->n_images = fallback->n_images;
copy->images = g_new (GtkCssImage *, fallback->n_images);
for (i = 0; i < fallback->n_images; i++)
{
copy->images[i] = _gtk_css_image_compute (fallback->images[i],
property_id,
provider,
style,
parent_style);
if (gtk_css_image_is_invalid (copy->images[i]))
continue;
if (copy->used < 0)
copy->used = i;
}
copy->color = computed_color;
return GTK_CSS_IMAGE (copy);
}
else
return GTK_CSS_IMAGE (g_object_ref (fallback));
}
typedef struct
{
GtkCssValue *color;
GPtrArray *images;
} ParseData;
static guint
gtk_css_image_fallback_parse_arg (GtkCssParser *parser,
guint arg,
gpointer _data)
{
ParseData *data = _data;
if (data->color != NULL)
{
gtk_css_parser_error_syntax (parser, "The color must be the last parameter");
return 0;
}
else if (_gtk_css_image_can_parse (parser))
{
GtkCssImage *image = _gtk_css_image_new_parse (parser);
if (image == NULL)
return 0;
if (!data->images)
data->images = g_ptr_array_new_with_free_func (g_object_unref);
g_ptr_array_add (data->images, image);
return 1;
}
else
{
data->color = _gtk_css_color_value_parse (parser);
if (data->color == NULL)
return 0;
return 1;
}
}
static gboolean
gtk_css_image_fallback_parse (GtkCssImage *image,
GtkCssParser *parser)
{
GtkCssImageFallback *self = GTK_CSS_IMAGE_FALLBACK (image);
ParseData data = { NULL, NULL };
if (!gtk_css_parser_has_function (parser, "image"))
{
gtk_css_parser_error_syntax (parser, "Expected 'image('");
return FALSE;
}
if (!gtk_css_parser_consume_function (parser, 1, G_MAXUINT, gtk_css_image_fallback_parse_arg, &data))
{
g_clear_pointer (&data.color, _gtk_css_value_unref);
if (data.images)
g_ptr_array_free (data.images, TRUE);
return FALSE;
}
self->color = data.color;
if (data.images)
{
self->n_images = data.images->len;
self->images = (GtkCssImage **) g_ptr_array_free (data.images, FALSE);
}
else
{
self->n_images = 0;
self->images = NULL;
}
return TRUE;
}
static gboolean
gtk_css_image_fallback_equal (GtkCssImage *image1,
GtkCssImage *image2)
{
GtkCssImageFallback *fallback1 = GTK_CSS_IMAGE_FALLBACK (image1);
GtkCssImageFallback *fallback2 = GTK_CSS_IMAGE_FALLBACK (image2);
if (fallback1->used < 0)
{
if (fallback2->used >= 0)
return FALSE;
return _gtk_css_value_equal (fallback1->color, fallback2->color);
}
if (fallback2->used < 0)
return FALSE;
return _gtk_css_image_equal (fallback1->images[fallback1->used],
fallback2->images[fallback2->used]);
}
static gboolean
gtk_css_image_fallback_is_computed (GtkCssImage *image)
{
GtkCssImageFallback *fallback = GTK_CSS_IMAGE_FALLBACK (image);
if (fallback->used < 0)
{
guint i;
if (fallback->color && !fallback->images)
return gtk_css_value_is_computed (fallback->color);
for (i = 0; i < fallback->n_images; i++)
{
if (!gtk_css_image_is_computed (fallback->images[i]))
{
return FALSE;
}
}
}
return TRUE;
}
static void
_gtk_css_image_fallback_class_init (GtkCssImageFallbackClass *klass)
{
GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
image_class->get_width = gtk_css_image_fallback_get_width;
image_class->get_height = gtk_css_image_fallback_get_height;
image_class->get_aspect_ratio = gtk_css_image_fallback_get_aspect_ratio;
image_class->snapshot = gtk_css_image_fallback_snapshot;
image_class->parse = gtk_css_image_fallback_parse;
image_class->compute = gtk_css_image_fallback_compute;
image_class->print = gtk_css_image_fallback_print;
image_class->equal = gtk_css_image_fallback_equal;
image_class->is_computed = gtk_css_image_fallback_is_computed;
object_class->dispose = gtk_css_image_fallback_dispose;
}
static void
_gtk_css_image_fallback_init (GtkCssImageFallback *image_fallback)
{
image_fallback->used = -1;
}