Adding upstream version 43.9.upstream/43.9upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 307 insertions, 0 deletions

diff --git a/src/st/st-shadow.c b/src/st/st-shadow.c
new file mode 100644
index 0000000..0a8e319
--- /dev/null
+++ b/src/st/st-shadow.c
@@ -0,0 +1,307 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/*
+ * st-shadow.c: Boxed type holding for -st-shadow attributes
+ *
+ * Copyright 2009, 2010 Florian Müllner
+ *
+ * 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 "config.h"
+
+#include "st-shadow.h"
+#include "st-private.h"
+
+G_DEFINE_BOXED_TYPE (StShadow, st_shadow, st_shadow_ref, st_shadow_unref)
+G_DEFINE_BOXED_TYPE (StShadowHelper, st_shadow_helper, st_shadow_helper_copy, st_shadow_helper_free)
+
+/**
+ * SECTION: st-shadow
+ * @short_description: Boxed type for -st-shadow attributes
+ *
+ * #StShadow is a boxed type for storing attributes of the -st-shadow
+ * property, modelled liberally after the CSS3 box-shadow property.
+ * See http://www.css3.info/preview/box-shadow/
+ *
+ */
+
+/**
+ * st_shadow_new:
+ * @color: shadow's color
+ * @xoffset: horizontal offset
+ * @yoffset: vertical offset
+ * @blur: blur radius
+ * @spread: spread radius
+ * @inset: whether the shadow should be inset
+ *
+ * Creates a new #StShadow
+ *
+ * Returns: the newly allocated shadow. Use st_shadow_free() when done
+ */
+StShadow *
+st_shadow_new (ClutterColor *color,
+               gdouble       xoffset,
+               gdouble       yoffset,
+               gdouble       blur,
+               gdouble       spread,
+               gboolean      inset)
+{
+  StShadow *shadow;
+
+  shadow = g_new (StShadow, 1);
+
+  shadow->color     = *color;
+  shadow->xoffset   = xoffset;
+  shadow->yoffset   = yoffset;
+  shadow->blur      = blur;
+  shadow->spread    = spread;
+  shadow->inset     = inset;
+  shadow->ref_count = 1;
+
+  return shadow;
+}
+
+/**
+ * st_shadow_ref:
+ * @shadow: a #StShadow
+ *
+ * Atomically increments the reference count of @shadow by one.
+ *
+ * Returns: the passed in #StShadow.
+ */
+StShadow *
+st_shadow_ref (StShadow *shadow)
+{
+  g_return_val_if_fail (shadow != NULL, NULL);
+  g_return_val_if_fail (shadow->ref_count > 0, shadow);
+
+  g_atomic_int_inc (&shadow->ref_count);
+  return shadow;
+}
+
+/**
+ * st_shadow_unref:
+ * @shadow: a #StShadow
+ *
+ * Atomically decrements the reference count of @shadow by one.
+ * If the reference count drops to 0, all memory allocated by the
+ * #StShadow is released.
+ */
+void
+st_shadow_unref (StShadow *shadow)
+{
+  g_return_if_fail (shadow != NULL);
+  g_return_if_fail (shadow->ref_count > 0);
+
+  if (g_atomic_int_dec_and_test (&shadow->ref_count))
+    g_free (shadow);
+}
+
+/**
+ * st_shadow_equal:
+ * @shadow: a #StShadow
+ * @other: a different #StShadow
+ *
+ * Check if two shadow objects are identical. Note that two shadows may
+ * compare non-identically if they differ only by floating point rounding
+ * errors.
+ *
+ * Returns: %TRUE if the two shadows are identical
+ */
+gboolean
+st_shadow_equal (StShadow *shadow,
+                 StShadow *other)
+{
+  g_return_val_if_fail (shadow != NULL, FALSE);
+  g_return_val_if_fail (other != NULL, FALSE);
+
+  if (shadow == other)
+    return TRUE;
+
+  /* We use strict equality to compare double quantities; this means
+   * that, for example, a shadow offset of 0.25in does not necessarily
+   * compare equal to a shadow offset of 18pt in this test. Assume
+   * that a few false negatives are mostly harmless.
+   */
+
+  return (clutter_color_equal (&shadow->color, &other->color) &&
+          shadow->xoffset == other->xoffset &&
+          shadow->yoffset == other->yoffset &&
+          shadow->blur == other->blur &&
+          shadow->spread == other->spread &&
+          shadow->inset == other->inset);
+}
+
+/**
+ * st_shadow_get_box:
+ * @shadow: a #StShadow
+ * @actor_box: the box allocated to a #ClutterAlctor
+ * @shadow_box: computed box occupied by @shadow
+ *
+ * Gets the box used to paint @shadow, which will be partly
+ * outside of @actor_box
+ */
+void
+st_shadow_get_box (StShadow              *shadow,
+                   const ClutterActorBox *actor_box,
+                   ClutterActorBox       *shadow_box)
+{
+  g_return_if_fail (shadow != NULL);
+  g_return_if_fail (actor_box != NULL);
+  g_return_if_fail (shadow_box != NULL);
+
+  /* Inset shadows are drawn below the border, so returning
+   * the original box is not actually correct; still, it's
+   * good enough for the purpose of determining additional space
+   * required outside the actor box.
+   */
+  if (shadow->inset)
+    {
+      *shadow_box = *actor_box;
+      return;
+    }
+
+  shadow_box->x1 = actor_box->x1 + shadow->xoffset
+                   - shadow->blur - shadow->spread;
+  shadow_box->x2 = actor_box->x2 + shadow->xoffset
+                   + shadow->blur + shadow->spread;
+  shadow_box->y1 = actor_box->y1 + shadow->yoffset
+                   - shadow->blur - shadow->spread;
+  shadow_box->y2 = actor_box->y2 + shadow->yoffset
+                   + shadow->blur + shadow->spread;
+}
+
+/**
+ * SECTION: st-shadow-helper
+ *
+ * An helper for implementing a drop shadow on a actor.
+ * The actor is expected to recreate the helper whenever its contents
+ * or size change. Then, it would call st_shadow_helper_paint() inside
+ * its paint() virtual function.
+ */
+
+struct _StShadowHelper {
+  StShadow     *shadow;
+  CoglPipeline *pipeline;
+
+  gfloat        width;
+  gfloat        height;
+};
+
+/**
+ * st_shadow_helper_new:
+ * @shadow: a #StShadow representing the shadow properties
+ *
+ * Builds a #StShadowHelper that will build a drop shadow
+ * using @source as the mask.
+ *
+ * Returns: (transfer full): a new #StShadowHelper
+ */
+StShadowHelper *
+st_shadow_helper_new (StShadow     *shadow)
+{
+  StShadowHelper *helper;
+
+  helper = g_new0 (StShadowHelper, 1);
+  helper->shadow = st_shadow_ref (shadow);
+
+  return helper;
+}
+
+/**
+ * st_shadow_helper_update:
+ * @helper: a #StShadowHelper
+ * @source: a #ClutterActor
+ *
+ * Update @helper from @source.
+ */
+void
+st_shadow_helper_update (StShadowHelper *helper,
+                         ClutterActor   *source)
+{
+  gfloat width, height;
+
+  clutter_actor_get_size (source, &width, &height);
+
+  if (helper->pipeline == NULL ||
+      helper->width != width ||
+      helper->height != height)
+    {
+      if (helper->pipeline)
+        cogl_object_unref (helper->pipeline);
+
+      helper->pipeline = _st_create_shadow_pipeline_from_actor (helper->shadow, source);
+      helper->width = width;
+      helper->height = height;
+    }
+}
+
+/**
+ * st_shadow_helper_copy:
+ * @helper: the #StShadowHelper to copy
+ *
+ * Returns: (transfer full): a copy of @helper
+ */
+StShadowHelper *
+st_shadow_helper_copy (StShadowHelper *helper)
+{
+  StShadowHelper *copy;
+
+  copy = g_new (StShadowHelper, 1);
+  *copy = *helper;
+  if (copy->pipeline)
+    cogl_object_ref (copy->pipeline);
+  st_shadow_ref (copy->shadow);
+
+  return copy;
+}
+
+/**
+ * st_shadow_helper_free:
+ * @helper: a #StShadowHelper
+ *
+ * Free resources associated with @helper.
+ */
+void
+st_shadow_helper_free (StShadowHelper *helper)
+{
+  if (helper->pipeline)
+    cogl_object_unref (helper->pipeline);
+  st_shadow_unref (helper->shadow);
+
+  g_free (helper);
+}
+
+/**
+ * st_shadow_helper_paint:
+ * @helper: a #StShadowHelper
+ * @framebuffer: a #CoglFramebuffer
+ * @actor_box: the bounding box of the shadow
+ * @paint_opacity: the opacity at which the shadow is painted
+ *
+ * Paints the shadow associated with @helper This must only
+ * be called from the implementation of ClutterActor::paint().
+ */
+void
+st_shadow_helper_paint (StShadowHelper  *helper,
+                        CoglFramebuffer *framebuffer,
+                        ClutterActorBox *actor_box,
+                        guint8           paint_opacity)
+{
+  _st_paint_shadow_with_opacity (helper->shadow,
+                                 framebuffer,
+                                 helper->pipeline,
+                                 actor_box,
+                                 paint_opacity);
+}