File Add-GtkHdyShadowHelper.patch of Package gtk3
From: Alexander Mikhaylenko <alexm@gnome.org>
Date: Wed, 14 Oct 2020 16:05:39 +0500
Subject: Add GtkHdyShadowHelper
This is imported from HdyShadowHelper from libhandy 1.0.2.
---
gtk/hdy-shadow-helper-private.h | 37 ++++
gtk/hdy-shadow-helper.c | 453 ++++++++++++++++++++++++++++++++++++++++
gtk/meson.build | 2 +
3 files changed, 492 insertions(+)
create mode 100644 gtk/hdy-shadow-helper-private.h
create mode 100644 gtk/hdy-shadow-helper.c
diff --git a/gtk/hdy-shadow-helper-private.h b/gtk/hdy-shadow-helper-private.h
new file mode 100644
index 0000000..1b34ddb
--- /dev/null
+++ b/gtk/hdy-shadow-helper-private.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Alexander Mikhaylenko <exalm7659@gmail.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#pragma once
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include "gtkenums.h"
+#include "gtkwidget.h"
+#include "gtkwidgetpath.h"
+
+G_BEGIN_DECLS
+
+#define GTK_HDY_TYPE_SHADOW_HELPER (gtk_hdy_shadow_helper_get_type())
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkStyleContext, g_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkWidgetPath, gtk_widget_path_unref)
+
+G_DECLARE_FINAL_TYPE (GtkHdyShadowHelper, gtk_hdy_shadow_helper, GTK, HDY_SHADOW_HELPER, GObject)
+
+GtkHdyShadowHelper * gtk_hdy_shadow_helper_new (GtkWidget *widget);
+
+void gtk_hdy_shadow_helper_clear_cache (GtkHdyShadowHelper *self);
+
+void gtk_hdy_shadow_helper_draw_shadow (GtkHdyShadowHelper *self,
+ cairo_t *cr,
+ gint width,
+ gint height,
+ gdouble progress,
+ GtkPanDirection direction);
+
+G_END_DECLS
diff --git a/gtk/hdy-shadow-helper.c b/gtk/hdy-shadow-helper.c
new file mode 100644
index 0000000..69583c4
--- /dev/null
+++ b/gtk/hdy-shadow-helper.c
@@ -0,0 +1,453 @@
+/*
+ * Copyright (C) 2019 Alexander Mikhaylenko <exalm7659@gmail.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#include "hdy-shadow-helper-private.h"
+
+#include "gtkrender.h"
+#include "gtkstylecontext.h"
+#include "gtktypebuiltins.h"
+#include "gtkwidgetpath.h"
+#include "hdy-cairo-private.h"
+
+#include <math.h>
+
+/**
+ * PRIVATE:gtk-hdy-shadow-helper
+ * @short_description: Shadow helper used in #GtkHdyLeaflet
+ * @title: GtkHdyShadowHelper
+ * @See_also: #GtkHdyLeaflet
+ * @stability: Private
+ *
+ * A helper class for drawing #GtkHdyLeaflet transition shadow.
+ *
+ * Since: 0.0.12
+ */
+
+struct _GtkHdyShadowHelper
+{
+ GObject parent_instance;
+
+ GtkWidget *widget;
+
+ gboolean is_cache_valid;
+
+ cairo_pattern_t *dimming_pattern;
+ cairo_pattern_t *shadow_pattern;
+ cairo_pattern_t *border_pattern;
+ cairo_pattern_t *outline_pattern;
+ gint shadow_size;
+ gint border_size;
+ gint outline_size;
+
+ GtkPanDirection last_direction;
+ gint last_width;
+ gint last_height;
+ gint last_scale;
+};
+
+G_DEFINE_TYPE (GtkHdyShadowHelper, gtk_hdy_shadow_helper, G_TYPE_OBJECT);
+
+enum {
+ PROP_0,
+ PROP_WIDGET,
+ LAST_PROP,
+};
+
+static GParamSpec *props[LAST_PROP];
+
+
+static GtkStyleContext *
+create_context (GtkHdyShadowHelper *self,
+ const gchar *name,
+ GtkPanDirection direction)
+{
+ g_autoptr(GtkWidgetPath) path = NULL;
+ GtkStyleContext *context;
+ gint pos;
+ const gchar *direction_name;
+ GEnumClass *enum_class;
+
+ enum_class = g_type_class_ref (GTK_TYPE_PAN_DIRECTION);
+ direction_name = g_enum_get_value (enum_class, direction)->value_nick;
+
+ path = gtk_widget_path_copy (gtk_widget_get_path (self->widget));
+
+ pos = gtk_widget_path_append_type (path, GTK_TYPE_WIDGET);
+ gtk_widget_path_iter_set_object_name (path, pos, name);
+
+ gtk_widget_path_iter_add_class (path, pos, direction_name);
+
+ context = gtk_style_context_new ();
+ gtk_style_context_set_path (context, path);
+
+ g_type_class_unref (enum_class);
+
+ return context;
+}
+
+static gint
+get_element_size (GtkStyleContext *context,
+ GtkPanDirection direction)
+{
+ gint width, height;
+
+ gtk_style_context_get (context,
+ gtk_style_context_get_state (context),
+ "min-width", &width,
+ "min-height", &height,
+ NULL);
+
+ switch (direction) {
+ case GTK_PAN_DIRECTION_LEFT:
+ case GTK_PAN_DIRECTION_RIGHT:
+ return width;
+ case GTK_PAN_DIRECTION_UP:
+ case GTK_PAN_DIRECTION_DOWN:
+ return height;
+ default:
+ g_assert_not_reached ();
+ }
+
+ return 0;
+}
+
+static cairo_pattern_t *
+create_element_pattern (GtkStyleContext *context,
+ gint width,
+ gint height,
+ gint scale)
+{
+ g_autoptr (cairo_surface_t) surface =
+ cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width * scale, height * scale);
+ g_autoptr (cairo_t) cr = cairo_create (surface);
+ cairo_pattern_t *pattern;
+
+ cairo_surface_set_device_scale (surface, scale, scale);
+
+ gtk_render_background (context, cr, 0, 0, width, height);
+ gtk_render_frame (context, cr, 0, 0, width, height);
+
+ pattern = cairo_pattern_create_for_surface (surface);
+
+ return pattern;
+}
+
+static void
+cache_shadow (GtkHdyShadowHelper *self,
+ gint width,
+ gint height,
+ GtkPanDirection direction)
+{
+ g_autoptr(GtkStyleContext) dim_context = NULL;
+ g_autoptr(GtkStyleContext) shadow_context = NULL;
+ g_autoptr(GtkStyleContext) border_context = NULL;
+ g_autoptr(GtkStyleContext) outline_context = NULL;
+ gint shadow_size, border_size, outline_size, scale;
+
+ scale = gtk_widget_get_scale_factor (self->widget);
+
+ if (self->last_direction == direction &&
+ self->last_width == width &&
+ self->last_height == height &&
+ self->last_scale == scale &&
+ self->is_cache_valid)
+ return;
+
+ gtk_hdy_shadow_helper_clear_cache (self);
+
+ dim_context = create_context (self, "dimming", direction);
+ shadow_context = create_context (self, "shadow", direction);
+ border_context = create_context (self, "border", direction);
+ outline_context = create_context (self, "outline", direction);
+
+ shadow_size = get_element_size (shadow_context, direction);
+ border_size = get_element_size (border_context, direction);
+ outline_size = get_element_size (outline_context, direction);
+
+ self->dimming_pattern = create_element_pattern (dim_context, width, height, scale);
+ if (direction == GTK_PAN_DIRECTION_LEFT || direction == GTK_PAN_DIRECTION_RIGHT) {
+ self->shadow_pattern = create_element_pattern (shadow_context, shadow_size, height, scale);
+ self->border_pattern = create_element_pattern (border_context, border_size, height, scale);
+ self->outline_pattern = create_element_pattern (outline_context, outline_size, height, scale);
+ } else {
+ self->shadow_pattern = create_element_pattern (shadow_context, width, shadow_size, scale);
+ self->border_pattern = create_element_pattern (border_context, width, border_size, scale);
+ self->outline_pattern = create_element_pattern (outline_context, width, outline_size, scale);
+ }
+
+ self->border_size = border_size;
+ self->shadow_size = shadow_size;
+ self->outline_size = outline_size;
+
+ self->is_cache_valid = TRUE;
+ self->last_direction = direction;
+ self->last_width = width;
+ self->last_height = height;
+ self->last_scale = scale;
+}
+
+static void
+gtk_hdy_shadow_helper_dispose (GObject *object)
+{
+ GtkHdyShadowHelper *self = GTK_HDY_SHADOW_HELPER (object);
+
+ gtk_hdy_shadow_helper_clear_cache (self);
+
+ if (self->widget)
+ g_clear_object (&self->widget);
+
+ G_OBJECT_CLASS (gtk_hdy_shadow_helper_parent_class)->dispose (object);
+}
+
+static void
+gtk_hdy_shadow_helper_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GtkHdyShadowHelper *self = GTK_HDY_SHADOW_HELPER (object);
+
+ switch (prop_id) {
+ case PROP_WIDGET:
+ g_value_set_object (value, self->widget);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+gtk_hdy_shadow_helper_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GtkHdyShadowHelper *self = GTK_HDY_SHADOW_HELPER (object);
+
+ switch (prop_id) {
+ case PROP_WIDGET:
+ self->widget = GTK_WIDGET (g_object_ref (g_value_get_object (value)));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+gtk_hdy_shadow_helper_class_init (GtkHdyShadowHelperClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->dispose = gtk_hdy_shadow_helper_dispose;
+ object_class->get_property = gtk_hdy_shadow_helper_get_property;
+ object_class->set_property = gtk_hdy_shadow_helper_set_property;
+
+ /**
+ * GtkHdyShadowHelper:widget:
+ *
+ * The widget the shadow will be drawn for. Must not be %NULL
+ *
+ * Since: 0.0.11
+ */
+ props[PROP_WIDGET] =
+ g_param_spec_object ("widget",
+ _("Widget"),
+ _("The widget the shadow will be drawn for"),
+ GTK_TYPE_WIDGET,
+ G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
+
+ g_object_class_install_properties (object_class, LAST_PROP, props);
+}
+
+static void
+gtk_hdy_shadow_helper_init (GtkHdyShadowHelper *self)
+{
+}
+
+/**
+ * gtk_hdy_shadow_helper_new:
+ *
+ * Creates a new #GtkHdyShadowHelper object.
+ *
+ * Returns: The newly created #GtkHdyShadowHelper object
+ *
+ * Since: 0.0.12
+ */
+GtkHdyShadowHelper *
+gtk_hdy_shadow_helper_new (GtkWidget *widget)
+{
+ return g_object_new (GTK_HDY_TYPE_SHADOW_HELPER,
+ "widget", widget,
+ NULL);
+}
+
+/**
+ * gtk_hdy_shadow_helper_clear_cache:
+ * @self: a #GtkHdyShadowHelper
+ *
+ * Clears shadow cache. This should be used after a transition is done.
+ *
+ * Since: 0.0.12
+ */
+void
+gtk_hdy_shadow_helper_clear_cache (GtkHdyShadowHelper *self)
+{
+ if (!self->is_cache_valid)
+ return;
+
+ cairo_pattern_destroy (self->dimming_pattern);
+ cairo_pattern_destroy (self->shadow_pattern);
+ cairo_pattern_destroy (self->border_pattern);
+ cairo_pattern_destroy (self->outline_pattern);
+ self->border_size = 0;
+ self->shadow_size = 0;
+ self->outline_size = 0;
+
+ self->last_direction = 0;
+ self->last_width = 0;
+ self->last_height = 0;
+ self->last_scale = 0;
+
+ self->is_cache_valid = FALSE;
+}
+
+/**
+ * gtk_hdy_shadow_helper_draw_shadow:
+ * @self: a #GtkHdyShadowHelper
+ * @cr: a Cairo context to draw to
+ * @width: the width of the shadow rectangle
+ * @height: the height of the shadow rectangle
+ * @progress: transition progress, changes from 0 to 1
+ * @direction: shadow direction
+ *
+ * Draws a transition shadow. For caching to work, @width, @height and
+ * @direction shouldn't change between calls.
+ *
+ * Since: 0.0.12
+ */
+void
+gtk_hdy_shadow_helper_draw_shadow (GtkHdyShadowHelper *self,
+ cairo_t *cr,
+ gint width,
+ gint height,
+ gdouble progress,
+ GtkPanDirection direction)
+{
+ gdouble remaining_distance, shadow_opacity;
+ gint shadow_size, border_size, outline_size, distance;
+
+ if (progress >= 1)
+ return;
+
+ cache_shadow (self, width, height, direction);
+
+ shadow_size = self->shadow_size;
+ border_size = self->border_size;
+ outline_size = self->outline_size;
+
+ switch (direction) {
+ case GTK_PAN_DIRECTION_LEFT:
+ case GTK_PAN_DIRECTION_RIGHT:
+ distance = width;
+ break;
+ case GTK_PAN_DIRECTION_UP:
+ case GTK_PAN_DIRECTION_DOWN:
+ distance = height;
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+
+ remaining_distance = (1 - progress) * (gdouble) distance;
+ shadow_opacity = 1;
+ if (remaining_distance < shadow_size)
+ shadow_opacity = (remaining_distance / shadow_size);
+
+ cairo_save (cr);
+
+ switch (direction) {
+ case GTK_PAN_DIRECTION_LEFT:
+ cairo_rectangle (cr, -outline_size, 0, width + outline_size, height);
+ break;
+ case GTK_PAN_DIRECTION_RIGHT:
+ cairo_rectangle (cr, 0, 0, width + outline_size, height);
+ break;
+ case GTK_PAN_DIRECTION_UP:
+ cairo_rectangle (cr, 0, -outline_size, width, height + outline_size);
+ break;
+ case GTK_PAN_DIRECTION_DOWN:
+ cairo_rectangle (cr, 0, 0, width, height + outline_size);
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+ cairo_clip (cr);
+ gdk_window_mark_paint_from_clip (gtk_widget_get_window (self->widget), cr);
+
+ cairo_set_source (cr, self->dimming_pattern);
+ cairo_paint_with_alpha (cr, 1 - progress);
+
+ switch (direction) {
+ case GTK_PAN_DIRECTION_RIGHT:
+ cairo_translate (cr, width - shadow_size, 0);
+ break;
+ case GTK_PAN_DIRECTION_DOWN:
+ cairo_translate (cr, 0, height - shadow_size);
+ break;
+ case GTK_PAN_DIRECTION_LEFT:
+ case GTK_PAN_DIRECTION_UP:
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+
+ cairo_set_source (cr, self->shadow_pattern);
+ cairo_paint_with_alpha (cr, shadow_opacity);
+
+ switch (direction) {
+ case GTK_PAN_DIRECTION_RIGHT:
+ cairo_translate (cr, shadow_size - border_size, 0);
+ break;
+ case GTK_PAN_DIRECTION_DOWN:
+ cairo_translate (cr, 0, shadow_size - border_size);
+ break;
+ case GTK_PAN_DIRECTION_LEFT:
+ case GTK_PAN_DIRECTION_UP:
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+
+ cairo_set_source (cr, self->border_pattern);
+ cairo_paint (cr);
+
+ switch (direction) {
+ case GTK_PAN_DIRECTION_RIGHT:
+ cairo_translate (cr, border_size, 0);
+ break;
+ case GTK_PAN_DIRECTION_DOWN:
+ cairo_translate (cr, 0, border_size);
+ break;
+ case GTK_PAN_DIRECTION_LEFT:
+ cairo_translate (cr, -outline_size, 0);
+ break;
+ case GTK_PAN_DIRECTION_UP:
+ cairo_translate (cr, 0, -outline_size);
+ break;
+ default:
+ g_assert_not_reached ();
+ }
+
+ cairo_set_source (cr, self->outline_pattern);
+ cairo_paint (cr);
+
+ cairo_restore (cr);
+}
diff --git a/gtk/meson.build b/gtk/meson.build
index 98d1f13..228a017 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -385,6 +385,7 @@ gtk_sources = files(
'gdkpixbufutils.c',
'hdy-animation.c',
'hdy-css.c',
+ 'hdy-shadow-helper.c',
'hdy-squeezer.c',
'hdy-view-switcher-bar.c',
'hdy-view-switcher-button.c',
@@ -400,6 +401,7 @@ gtk_private_type_headers = files(
'hdy-animation-private.h',
'hdy-cairo-private.h',
'hdy-css-private.h',
+ 'hdy-shadow-helper-private.h',
'hdy-squeezer-private.h',
'hdy-view-switcher-bar-private.h',
'hdy-view-switcher-button-private.h',
