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GtkCssImage: add a class method to return a surface

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This will be useful in a later commit when we will avoid recreating a
surface in some cases.
This commit is contained in:
Cosimo Cecchi
2015-11-20 21:26:00 -08:00
parent 973ad918b9
commit 5e69a9dfb1
2 changed files with 52 additions and 30 deletions
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76
gtk/gtkcssimage.c
View File

@@ -60,6 +60,36 @@ gtk_css_image_real_get_aspect_ratio (GtkCssImage *image)
return 0;
}
static cairo_surface_t *
gtk_css_image_real_get_surface (GtkCssImage *image,
cairo_surface_t *target,
int surface_width,
int surface_height)
{
cairo_surface_t *result;
cairo_t *cr;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
g_return_val_if_fail (surface_width > 0, NULL);
g_return_val_if_fail (surface_height > 0, NULL);
if (target)
result = cairo_surface_create_similar (target,
CAIRO_CONTENT_COLOR_ALPHA,
surface_width,
surface_height);
else
result = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
surface_width,
surface_height);
cr = cairo_create (result);
_gtk_css_image_draw (image, cr, surface_width, surface_height);
cairo_destroy (cr);
return result;
}
static GtkCssImage *
gtk_css_image_real_compute (GtkCssImage *image,
guint property_id,
@@ -99,6 +129,7 @@ _gtk_css_image_class_init (GtkCssImageClass *klass)
klass->get_width = gtk_css_image_real_get_width;
klass->get_height = gtk_css_image_real_get_height;
klass->get_aspect_ratio = gtk_css_image_real_get_aspect_ratio;
klass->get_surface = gtk_css_image_real_get_surface;
klass->compute = gtk_css_image_real_compute;
klass->equal = gtk_css_image_real_equal;
klass->transition = gtk_css_image_real_transition;
@@ -145,6 +176,21 @@ _gtk_css_image_get_aspect_ratio (GtkCssImage *image)
return klass->get_aspect_ratio (image);
}
cairo_surface_t *
_gtk_css_image_get_surface (GtkCssImage *image,
cairo_surface_t *target,
int surface_width,
int surface_height)
{
GtkCssImageClass *klass;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
return klass->get_surface (image, target, surface_width, surface_height);
}
GtkCssImage *
_gtk_css_image_compute (GtkCssImage *image,
guint property_id,
@@ -377,36 +423,6 @@ _gtk_css_image_get_concrete_size (GtkCssImage *image,
}
}
cairo_surface_t *
_gtk_css_image_get_surface (GtkCssImage *image,
cairo_surface_t *target,
int surface_width,
int surface_height)
{
cairo_surface_t *result;
cairo_t *cr;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
g_return_val_if_fail (surface_width > 0, NULL);
g_return_val_if_fail (surface_height > 0, NULL);
if (target)
result = cairo_surface_create_similar (target,
CAIRO_CONTENT_COLOR_ALPHA,
surface_width,
surface_height);
else
result = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
surface_width,
surface_height);
cr = cairo_create (result);
_gtk_css_image_draw (image, cr, surface_width, surface_height);
cairo_destroy (cr);
return result;
}
static GType
gtk_css_image_get_parser_type (GtkCssParser *parser)
{

6
gtk/gtkcssimageprivate.h
View File

@@ -54,6 +54,12 @@ struct _GtkCssImageClass
/* aspect ratio (width / height) of image or 0 if it has no aspect ratio (optional) */
double (* get_aspect_ratio) (GtkCssImage *image);
/* returns a surface for specified width and height */
cairo_surface_t * (* get_surface) (GtkCssImage *image,
cairo_surface_t *target,
int surface_width,
int surface_height);
/* create "computed value" in CSS terms, returns a new reference */
GtkCssImage *(* compute) (GtkCssImage *image,
guint property_id,