[gtk/path-ops: 3/8] Add a glyphs test app
- From: Matthias Clasen <matthiasc src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/path-ops: 3/8] Add a glyphs test app
- Date: Fri, 25 Mar 2022 16:57:19 +0000 (UTC)
commit d38d871f8e39199b46e5d1c60bc052c082716fe6
Author: Matthias Clasen <mclasen redhat com>
Date: Sat Mar 19 23:57:22 2022 -0400
Add a glyphs test app
This is a testbed for gsk_path_simplify. It loads
a single glyph from a font file, and shows the outlines.
tests/glyphs.c | 662 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
tests/meson.build | 1 +
2 files changed, 663 insertions(+)
---
diff --git a/tests/glyphs.c b/tests/glyphs.c
new file mode 100644
index 0000000000..03d87cbaa1
--- /dev/null
+++ b/tests/glyphs.c
@@ -0,0 +1,662 @@
+#include <gtk/gtk.h>
+
+#define DEMO_TYPE_WIDGET (demo_widget_get_type ())
+G_DECLARE_FINAL_TYPE (DemoWidget, demo_widget, DEMO, WIDGET, GtkWidget)
+
+struct _DemoWidget
+{
+ GtkWidget parent_instance;
+ GskPath *orig_path;
+ GskPath *path;
+ GskPath *control_path;
+ graphene_point_t point;
+ graphene_point_t point2;
+ graphene_vec2_t tangent;
+ float curvature;
+ graphene_point_t center;
+
+ GtkWidget *label;
+
+ GskFillRule fill_rule;
+ gboolean do_fill;
+ gboolean do_outline;
+ gboolean show_points;
+ gboolean show_controls;
+ gboolean show_bounding_box;
+
+ graphene_rect_t bounds;
+
+ double zoom;
+
+ char *font_file;
+ gunichar ch;
+};
+
+struct _DemoWidgetClass
+{
+ GtkWidgetClass parent_class;
+};
+
+G_DEFINE_TYPE (DemoWidget, demo_widget, GTK_TYPE_WIDGET)
+
+static void
+demo_widget_init (DemoWidget *self)
+{
+ self->label = gtk_label_new ("");
+ gtk_widget_set_parent (self->label, GTK_WIDGET (self));
+ gtk_widget_set_halign (self->label, GTK_ALIGN_END);
+ gtk_widget_set_valign (self->label, GTK_ALIGN_START);
+ self->do_outline = TRUE;
+ self->font_file = g_strdup ("/usr/share/fonts/cantarell/Cantarell-VF.otf");
+ self->ch = 'e';
+}
+
+static void
+draw_point (GtkSnapshot *snapshot,
+ const graphene_point_t *pt)
+{
+ graphene_rect_t bounds;
+ GdkRGBA color = { 1, 0, 0, 1 };
+
+ bounds.origin.x = pt->x - 2;
+ bounds.origin.y = pt->y - 2;
+ bounds.size.width = 4;
+ bounds.size.height = 4;
+
+ gtk_snapshot_append_color (snapshot, &color, &bounds);
+}
+
+static gboolean
+curve_cb (GskPathOperation op,
+ const graphene_point_t *pts,
+ gsize n_ts,
+ float weight,
+ gpointer user_data)
+{
+ GtkSnapshot *snapshot = user_data;
+
+ switch (op)
+ {
+ case GSK_PATH_MOVE:
+ break;
+
+ case GSK_PATH_CLOSE:
+ draw_point (snapshot, &pts[0]);
+ break;
+
+ case GSK_PATH_LINE:
+ draw_point (snapshot, &pts[1]);
+ break;
+
+ case GSK_PATH_CURVE:
+ draw_point (snapshot, &pts[1]);
+ draw_point (snapshot, &pts[2]);
+ draw_point (snapshot, &pts[3]);
+ break;
+
+ case GSK_PATH_CONIC:
+ default:
+ g_assert_not_reached ();
+ }
+
+ return TRUE;
+}
+
+static gboolean
+point_cb (GskPathOperation op,
+ const graphene_point_t *pts,
+ gsize n_ts,
+ float weight,
+ gpointer user_data)
+{
+ GtkSnapshot *snapshot = user_data;
+
+ switch (op)
+ {
+ case GSK_PATH_MOVE:
+ break;
+
+ case GSK_PATH_CLOSE:
+ draw_point (snapshot, &pts[0]);
+ break;
+
+ case GSK_PATH_LINE:
+ draw_point (snapshot, &pts[1]);
+ break;
+
+ case GSK_PATH_CURVE:
+ draw_point (snapshot, &pts[3]);
+ break;
+
+ case GSK_PATH_CONIC:
+ default:
+ g_assert_not_reached ();
+ }
+
+ return TRUE;
+}
+
+static void
+demo_widget_snapshot (GtkWidget *widget,
+ GtkSnapshot *snapshot)
+{
+ DemoWidget *self = DEMO_WIDGET (widget);
+ int width, height;
+
+ if (!self->path)
+ return;
+
+ gtk_snapshot_save (snapshot);
+
+ gtk_snapshot_scale (snapshot, self->zoom, self->zoom);
+
+ width = gtk_widget_get_width (widget);
+ height = gtk_widget_get_width (widget);
+
+ if (self->do_fill)
+ {
+ gtk_snapshot_push_fill (snapshot, self->path, self->fill_rule);
+
+ gtk_snapshot_append_color (snapshot,
+ &(GdkRGBA){ 1, 0, 1, 0.2},
+ &GRAPHENE_RECT_INIT (0, 0, width, height ));
+
+ gtk_snapshot_pop (snapshot);
+ }
+
+ if (self->do_outline)
+ {
+ GskStroke *stroke;
+
+ stroke = gsk_stroke_new (1.0);
+ gtk_snapshot_push_stroke (snapshot, self->path, stroke);
+ gsk_stroke_free (stroke);
+
+ gtk_snapshot_append_color (snapshot,
+ &(GdkRGBA){ 0, 0, 0, 1},
+ &GRAPHENE_RECT_INIT (0, 0, width, height ));
+
+ gtk_snapshot_pop (snapshot);
+ }
+
+ if (self->show_controls)
+ {
+ GskStroke *stroke;
+
+ stroke = gsk_stroke_new (1.0);
+ gtk_snapshot_push_stroke (snapshot, self->control_path, stroke);
+ gsk_stroke_free (stroke);
+
+ gtk_snapshot_append_color (snapshot,
+ &(GdkRGBA){ 1, 0, 0, 1},
+ &GRAPHENE_RECT_INIT (0, 0, width, height ));
+
+ gtk_snapshot_pop (snapshot);
+
+ gsk_path_foreach (self->path, GSK_PATH_FOREACH_ALLOW_CURVE, curve_cb, snapshot);
+ }
+ else if (self->show_points)
+ {
+ gsk_path_foreach (self->path, GSK_PATH_FOREACH_ALLOW_CURVE, point_cb, snapshot);
+ }
+
+ if (self->show_bounding_box)
+ {
+ graphene_rect_t bounds;
+
+ if (gsk_path_get_bounds (self->path, &bounds))
+ {
+ GskPathBuilder *builder;
+ GskPath *path;
+ GskStroke *stroke;
+
+ builder = gsk_path_builder_new ();
+
+ gsk_path_builder_add_rect (builder, &bounds);
+
+ path = gsk_path_builder_free_to_path (builder);
+
+ stroke = gsk_stroke_new (1.0);
+ gtk_snapshot_push_stroke (snapshot, path, stroke);
+ gsk_stroke_free (stroke);
+
+ gtk_snapshot_append_color (snapshot,
+ &(GdkRGBA){ 0, 0, 0, 0.5},
+ &GRAPHENE_RECT_INIT (0, 0, width, height ));
+
+ gtk_snapshot_pop (snapshot);
+
+ gsk_path_unref (path);
+ }
+ }
+
+ gtk_snapshot_restore (snapshot);
+}
+
+static void
+demo_widget_measure (GtkWidget *widget,
+ GtkOrientation orientation,
+ int for_size,
+ int *minimum,
+ int *natural,
+ int *minimum_baseline,
+ int *natural_baseline)
+{
+ DemoWidget *self = DEMO_WIDGET (widget);
+ float size;
+
+ if (orientation == GTK_ORIENTATION_HORIZONTAL)
+ size = self->zoom * (self->bounds.origin.x + self->bounds.size.width + 10);
+ else
+ size = self->zoom * (self->bounds.origin.y + self->bounds.size.height + 10);
+
+ *minimum = *natural = (int)size;
+}
+
+static void
+demo_widget_size_allocate (GtkWidget *widget,
+ int width,
+ int height,
+ int baseline)
+{
+ DemoWidget *self = DEMO_WIDGET (widget);
+ GtkRequisition min, nat;
+
+ gtk_widget_get_preferred_size (self->label, &min, &nat);
+
+ gtk_widget_size_allocate (self->label,
+ &(GtkAllocation) { width - nat.width, 0, nat.width, nat.height},
+ -1);
+}
+
+static void
+demo_widget_dispose (GObject *object)
+{
+ DemoWidget *self = DEMO_WIDGET (object);
+
+ g_clear_pointer (&self->path, gsk_path_unref);
+ g_clear_pointer (&self->control_path, gsk_path_unref);
+ g_clear_pointer (&self->label, gtk_widget_unparent);
+ g_free (self->font_file);
+
+ G_OBJECT_CLASS (demo_widget_parent_class)->dispose (object);
+}
+
+static void
+demo_widget_class_init (DemoWidgetClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+ object_class->dispose = demo_widget_dispose;
+
+ widget_class->snapshot = demo_widget_snapshot;
+ widget_class->measure = demo_widget_measure;
+ widget_class->size_allocate = demo_widget_size_allocate;
+}
+
+static GtkWidget *
+demo_widget_new (void)
+{
+ return g_object_new (DEMO_TYPE_WIDGET, NULL);
+}
+
+static gboolean
+control_cb (GskPathOperation op,
+ const graphene_point_t *pts,
+ gsize n_pts,
+ float weight,
+ gpointer user_data)
+{
+ GskPathBuilder *builder = user_data;
+
+ switch (op)
+ {
+ case GSK_PATH_MOVE:
+ gsk_path_builder_move_to (builder, pts[0].x, pts[0].y);
+ break;
+ case GSK_PATH_CLOSE:
+ gsk_path_builder_close (builder);
+ break;
+ case GSK_PATH_LINE:
+ gsk_path_builder_line_to (builder, pts[1].x, pts[1].y);
+ break;
+ case GSK_PATH_CURVE:
+ gsk_path_builder_line_to (builder, pts[1].x, pts[1].y);
+ gsk_path_builder_line_to (builder, pts[2].x, pts[2].y);
+ gsk_path_builder_line_to (builder, pts[3].x, pts[3].y);
+ break;
+ case GSK_PATH_CONIC:
+ default:
+ g_assert_not_reached ();
+ }
+
+ return TRUE;
+}
+
+static void
+demo_widget_set_path (DemoWidget *self,
+ GskPath *path)
+{
+ GskPathBuilder *builder;
+
+ g_clear_pointer (&self->path, gsk_path_unref);
+ g_clear_pointer (&self->control_path, gsk_path_unref);
+
+ self->path = gsk_path_simplify (path);
+
+ builder = gsk_path_builder_new ();
+ gsk_path_foreach (self->path, GSK_PATH_FOREACH_ALLOW_CURVE, control_cb, builder);
+ self->control_path = gsk_path_builder_free_to_path (builder);
+
+ gsk_path_get_bounds (self->path, &self->bounds);
+
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static float glyph_x0, glyph_y0;
+
+static void
+move_to (hb_draw_funcs_t *dfuncs,
+ GskPathBuilder *builder,
+ hb_draw_state_t *st,
+ float x,
+ float y,
+ void *data)
+{
+ gsk_path_builder_move_to (builder, glyph_x0 + x, glyph_y0 - y);
+}
+
+static void
+line_to (hb_draw_funcs_t *dfuncs,
+ GskPathBuilder *builder,
+ hb_draw_state_t *st,
+ float x,
+ float y,
+ void *data)
+{
+ gsk_path_builder_line_to (builder, glyph_x0 + x, glyph_y0 - y);
+}
+
+static void
+cubic_to (hb_draw_funcs_t *dfuncs,
+ GskPathBuilder *builder,
+ hb_draw_state_t *st,
+ float x1,
+ float y1,
+ float x2,
+ float y2,
+ float x3,
+ float y3,
+ void *data)
+{
+ gsk_path_builder_curve_to (builder,
+ glyph_x0 + x1, glyph_y0 - y1,
+ glyph_x0 + x2, glyph_y0 - y2,
+ glyph_x0 + x3, glyph_y0 - y3);
+}
+
+
+static void
+close_path (hb_draw_funcs_t *dfuncs,
+ GskPathBuilder *builder,
+ hb_draw_state_t *st,
+ void *data)
+{
+ gsk_path_builder_close (builder);
+}
+
+static void
+init_demo (DemoWidget *demo)
+{
+ hb_blob_t *blob;
+ hb_face_t *face;
+ hb_font_t *font;
+ hb_draw_funcs_t *funcs;
+ hb_codepoint_t glyph;
+ GskPathBuilder *builder;
+ GskPath *path;
+ hb_glyph_extents_t extents;
+
+ builder = gsk_path_builder_new ();
+
+ blob = hb_blob_create_from_file (demo->font_file);
+ face = hb_face_create (blob, 0);
+ font = hb_font_create (face);
+
+ funcs = hb_draw_funcs_create ();
+
+ hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, NULL, NULL);
+ hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, NULL, NULL);
+ hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, NULL, NULL);
+ hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, NULL, NULL);
+
+ hb_font_get_nominal_glyph (font, demo->ch, &glyph);
+
+ hb_font_get_glyph_extents (font, glyph, &extents);
+
+ glyph_x0 = 10 + extents.x_bearing;
+ glyph_y0 = 10 + extents.y_bearing;
+
+ gsk_path_builder_move_to (builder, extents.x_bearing, - extents.height);
+
+ hb_font_get_glyph_shape (font, glyph, funcs, builder);
+
+ hb_draw_funcs_destroy (funcs);
+
+ hb_font_destroy (font);
+ hb_face_destroy (face);
+ hb_blob_destroy (blob);
+
+ path = gsk_path_builder_free_to_path (builder);
+
+ demo_widget_set_path (demo, path);
+
+ gsk_path_unref (path);
+
+ demo->zoom = 1;
+}
+
+static void
+demo_widget_set_font_file (DemoWidget *demo,
+ const char *file)
+{
+ g_free (demo->font_file);
+ demo->font_file = g_strdup (file);
+ init_demo (demo);
+}
+
+static void
+demo_widget_set_char (DemoWidget *demo,
+ const char *text)
+{
+ demo->ch = g_utf8_get_char (text);
+ init_demo (demo);
+}
+
+static void
+zoom_changed (GtkRange *range,
+ DemoWidget *self)
+{
+ self->zoom = gtk_range_get_value (range);
+ gtk_widget_queue_resize (GTK_WIDGET (self));
+}
+
+static void
+bb_toggled (GtkCheckButton *button,
+ DemoWidget *self)
+{
+ self->show_bounding_box = gtk_check_button_get_active (button);
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+fill_toggled (GtkCheckButton *button,
+ DemoWidget *self)
+{
+ self->do_fill = gtk_check_button_get_active (button);
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+points_toggled (GtkCheckButton *button,
+ DemoWidget *self)
+{
+ self->show_points = gtk_check_button_get_active (button);
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+controls_toggled (GtkCheckButton *button,
+ DemoWidget *self)
+{
+ self->show_controls = gtk_check_button_get_active (button);
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+outline_toggled (GtkCheckButton *button,
+ DemoWidget *self)
+{
+ self->do_outline = gtk_check_button_get_active (button);
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+fill_rule_changed (GtkDropDown *combo,
+ GParamSpec *pspec,
+ DemoWidget *self)
+{
+ self->fill_rule = (GskFillRule)gtk_drop_down_get_selected (combo);
+ gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+response_cb (GtkNativeDialog *dialog,
+ int response,
+ gpointer user_data)
+{
+ GtkButton *button = user_data;
+ DemoWidget *demo;
+
+ demo = (DemoWidget *)g_object_get_data (G_OBJECT (dialog), "demo");
+
+ if (response == GTK_RESPONSE_ACCEPT)
+ {
+ GFile *file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog));
+ const char *path = g_file_peek_path (file);
+ char *basename = g_path_get_basename (path);
+
+ gtk_button_set_label (button, basename);
+ g_free (basename);
+
+ demo_widget_set_font_file (demo, path);
+ }
+
+ gtk_native_dialog_destroy (dialog);
+ g_object_unref (dialog);
+}
+
+static void
+filechooser_cb (GtkButton *button,
+ DemoWidget *demo)
+{
+ GtkFileChooserNative *dialog;
+
+ dialog = gtk_file_chooser_native_new ("Font",
+ GTK_WINDOW (gtk_widget_get_ancestor (GTK_WIDGET (button),
GTK_TYPE_WINDOW)),
+ GTK_FILE_CHOOSER_ACTION_OPEN,
+ "Open", "Cancel");
+
+ g_object_set_data (G_OBJECT (dialog), "demo", demo);
+ g_signal_connect (dialog, "response", G_CALLBACK (response_cb), button);
+ gtk_native_dialog_show (GTK_NATIVE_DIALOG (dialog));
+}
+
+static void
+activate_entry (GtkEntry *entry,
+ DemoWidget *demo)
+{
+ demo_widget_set_char (demo, gtk_editable_get_text (GTK_EDITABLE (entry)));
+}
+
+int
+main (int argc, char *argv[])
+{
+ GtkWidget *window, *box, *demo;
+ GtkWidget *button;
+ GtkWidget *header, *toggle;
+ GtkWidget *combo, *sw;
+ GtkWidget *zoom_scale;
+ GtkWidget *hbox, *entry;
+
+ gtk_init ();
+
+ window = gtk_window_new ();
+ gtk_window_set_default_size (GTK_WINDOW (window), 700, 500);
+ box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+ gtk_window_set_child (GTK_WINDOW (window), box);
+
+ demo = demo_widget_new ();
+ gtk_widget_set_hexpand (demo, TRUE);
+ gtk_widget_set_vexpand (demo, TRUE);
+ sw = gtk_scrolled_window_new ();
+ gtk_box_append (GTK_BOX (box), sw);
+ gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), demo);
+
+ hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
+ gtk_box_append (GTK_BOX (box), hbox);
+ button = gtk_button_new_with_label ("Cantarell-VF.otf");
+ gtk_box_append (GTK_BOX (hbox), button);
+
+ g_signal_connect (button, "clicked", G_CALLBACK (filechooser_cb), demo);
+ entry = gtk_entry_new ();
+ gtk_editable_set_text (GTK_EDITABLE (entry), "e");
+ gtk_box_append (GTK_BOX (hbox), entry);
+ g_signal_connect (entry, "activate", G_CALLBACK (activate_entry), demo);
+
+ toggle = gtk_check_button_new_with_label ("Outline");
+ gtk_check_button_set_active (GTK_CHECK_BUTTON (toggle), TRUE);
+ g_signal_connect (toggle, "toggled", G_CALLBACK (outline_toggled), demo);
+ gtk_box_append (GTK_BOX (hbox), toggle);
+
+ toggle = gtk_check_button_new_with_label ("Fill");
+ g_signal_connect (toggle, "toggled", G_CALLBACK (fill_toggled), demo);
+ gtk_box_append (GTK_BOX (hbox), toggle);
+
+ toggle = gtk_check_button_new_with_label ("Points");
+ g_signal_connect (toggle, "toggled", G_CALLBACK (points_toggled), demo);
+ gtk_box_append (GTK_BOX (hbox), toggle);
+
+ toggle = gtk_check_button_new_with_label ("Controls");
+ g_signal_connect (toggle, "toggled", G_CALLBACK (controls_toggled), demo);
+ gtk_box_append (GTK_BOX (hbox), toggle);
+
+ toggle = gtk_check_button_new_with_label ("Bounds");
+ g_signal_connect (toggle, "toggled", G_CALLBACK (bb_toggled), demo);
+ gtk_box_append (GTK_BOX (hbox), toggle);
+
+ combo = gtk_drop_down_new_from_strings ((const char *[]){"Winding", "Even-Odd", NULL });
+ g_signal_connect (combo, "notify::selected", G_CALLBACK (fill_rule_changed), demo);
+ gtk_box_append (GTK_BOX (hbox), combo);
+
+ init_demo (DEMO_WIDGET (demo));
+
+ header = gtk_header_bar_new ();
+
+ zoom_scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0.3, 3, 0.1);
+ gtk_scale_add_mark (GTK_SCALE (zoom_scale), 1.0, GTK_POS_BOTTOM, NULL);
+ gtk_range_set_value (GTK_RANGE (zoom_scale), 1);
+ g_signal_connect (zoom_scale, "value-changed", G_CALLBACK (zoom_changed), demo);
+ gtk_widget_set_size_request (zoom_scale, 150, -1);
+ gtk_header_bar_pack_end (GTK_HEADER_BAR (header), zoom_scale);
+
+ gtk_window_set_titlebar (GTK_WINDOW (window), header);
+
+ gtk_window_present (GTK_WINDOW (window));
+
+ while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0)
+ g_main_context_iteration (NULL, TRUE);
+
+ return 0;
+}
diff --git a/tests/meson.build b/tests/meson.build
index 7597f03181..1a221d1829 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -8,6 +8,7 @@ gtk_tests = [
['motion-compression'],
['overlayscroll'],
['curve2'],
+ ['glyphs'],
['testupload'],
['testtransform'],
['testdropdown'],
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