gtk-demo: Rewrite the text mask demo
Use GtkSnapshot and GskPath instead of cairo for this.
This commit is contained in:
Matthias Clasen
committed by
Benjamin Otte
Benjamin Otte
parent
367a4cf800
commit
43e777d6a4
@@ -7,68 +7,186 @@
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#include <glib/gi18n.h>
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#include <gtk/gtk.h>
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static void
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draw_text (GtkDrawingArea *da,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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#define TEXT_TYPE_MASK_DEMO (text_mask_demo_get_type ())
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G_DECLARE_FINAL_TYPE (TextMaskDemo, text_mask_demo, TEXT, MASK_DEMO, GtkWidget)
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struct _TextMaskDemo
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{
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cairo_pattern_t *pattern;
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PangoLayout *layout;
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GtkWidget parent_instance;
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char *text;
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PangoFontDescription *desc;
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GskPath *path;
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};
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cairo_save (cr);
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struct _TextMaskDemoClass
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{
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GtkWidgetClass parent_class;
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};
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layout = gtk_widget_create_pango_layout (GTK_WIDGET (da), "Pango power!\nPango power!\nPango power!");
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desc = pango_font_description_from_string ("sans bold 34");
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pango_layout_set_font_description (layout, desc);
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pango_font_description_free (desc);
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G_DEFINE_TYPE (TextMaskDemo, text_mask_demo, GTK_TYPE_WIDGET)
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cairo_move_to (cr, 30, 20);
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pango_cairo_layout_path (cr, layout);
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g_object_unref (layout);
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static void
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update_path (TextMaskDemo *demo)
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{
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PangoLayout *layout;
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GskPathBuilder *builder;
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pattern = cairo_pattern_create_linear (0.0, 0.0, width, height);
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cairo_pattern_add_color_stop_rgb (pattern, 0.0, 1.0, 0.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.2, 1.0, 0.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.3, 1.0, 1.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.4, 0.0, 1.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.6, 0.0, 1.0, 1.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.7, 0.0, 0.0, 1.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.8, 1.0, 0.0, 1.0);
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cairo_pattern_add_color_stop_rgb (pattern, 1.0, 1.0, 0.0, 1.0);
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g_clear_pointer (&demo->path, gsk_path_unref);
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cairo_set_source (cr, pattern);
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cairo_fill_preserve (cr);
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layout = gtk_widget_create_pango_layout (GTK_WIDGET (demo), demo->text);
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pango_layout_set_font_description (layout, demo->desc);
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cairo_pattern_destroy (pattern);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_layout (builder, layout);
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demo->path = gsk_path_builder_free_to_path (builder);
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_set_line_width (cr, 0.5);
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cairo_stroke (cr);
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gtk_widget_queue_draw (GTK_WIDGET (demo));
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}
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cairo_restore (cr);
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static void
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text_mask_demo_init (TextMaskDemo *demo)
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{
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demo->text = g_strdup ("No text. No fun");
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demo->desc = pango_font_description_from_string ("Cantarell 20");
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update_path (demo);
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}
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static void
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text_mask_demo_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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TextMaskDemo *demo = TEXT_MASK_DEMO (widget);
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float width, height;
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GskColorStop stops[4];
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GskStroke *stroke;
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gdk_rgba_parse (&stops[0].color, "red");
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gdk_rgba_parse (&stops[1].color, "green");
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gdk_rgba_parse (&stops[2].color, "yellow");
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gdk_rgba_parse (&stops[3].color, "blue");
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width = gtk_widget_get_width (widget);
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height = gtk_widget_get_height (widget);
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stops[0].offset = 0;
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stops[1].offset = 0.25;
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stops[2].offset = 0.50;
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stops[3].offset = 0.75;
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gtk_snapshot_push_fill (snapshot, demo->path, GSK_FILL_RULE_WINDING);
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gtk_snapshot_append_linear_gradient (snapshot,
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&GRAPHENE_RECT_INIT (0, 0, width, height),
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&GRAPHENE_POINT_INIT (0, 0),
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&GRAPHENE_POINT_INIT (width, height),
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stops, 4);
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gtk_snapshot_pop (snapshot);
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stroke = gsk_stroke_new (1.0);
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gtk_snapshot_push_stroke (snapshot, demo->path, stroke);
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gsk_stroke_free (stroke);
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gtk_snapshot_append_color (snapshot,
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&(GdkRGBA){ 0, 0, 0, 1 },
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&GRAPHENE_RECT_INIT (0, 0, width, height));
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gtk_snapshot_pop (snapshot);
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}
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void
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text_mask_demo_measure (GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum_size,
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int *natural_size,
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int *minimum_baseline,
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int *natural_baseline)
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{
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TextMaskDemo *demo = TEXT_MASK_DEMO (widget);
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graphene_rect_t rect;
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gsk_path_get_bounds (demo->path, &rect);
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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*minimum_size = *natural_size = rect.size.width;
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else
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*minimum_size = *natural_size = rect.size.height;
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}
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static void
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text_mask_demo_finalize (GObject *object)
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{
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TextMaskDemo *demo = TEXT_MASK_DEMO (object);
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g_free (demo->text);
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pango_font_description_free (demo->desc);
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gsk_path_unref (demo->path);
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G_OBJECT_CLASS (text_mask_demo_parent_class)->finalize (object);
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}
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static void
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text_mask_demo_class_init (TextMaskDemoClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->finalize = text_mask_demo_finalize;
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widget_class->snapshot = text_mask_demo_snapshot;
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widget_class->measure = text_mask_demo_measure;
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}
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static GtkWidget *
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text_mask_demo_new (void)
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{
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return g_object_new (text_mask_demo_get_type (), NULL);
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}
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static void
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text_mask_demo_set_text (TextMaskDemo *demo,
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const char *text)
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{
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g_free (demo->text);
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demo->text = g_strdup (text);
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update_path (demo);
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}
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static void
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text_mask_demo_set_font (TextMaskDemo *demo,
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PangoFontDescription *desc)
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{
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pango_font_description_free (demo->desc);
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demo->desc = pango_font_description_copy (desc);
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update_path (demo);
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}
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GtkWidget *
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do_textmask (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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static GtkWidget *da;
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static GtkWidget *demo;
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if (!window)
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{
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PangoFontDescription *desc;
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window = gtk_window_new ();
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gtk_window_set_resizable (GTK_WINDOW (window), TRUE);
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gtk_widget_set_size_request (window, 400, 240);
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gtk_window_set_title (GTK_WINDOW (window), "Text Mask");
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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da = gtk_drawing_area_new ();
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demo = text_mask_demo_new ();
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text_mask_demo_set_text (TEXT_MASK_DEMO (demo), "Pango power!\nPango power!\nPango power!");
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desc = pango_font_description_from_string ("Sans Bold 34");
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text_mask_demo_set_font (TEXT_MASK_DEMO (demo), desc);
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pango_font_description_free (desc);
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gtk_window_set_child (GTK_WINDOW (window), da);
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_text, NULL, NULL);
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gtk_window_set_child (GTK_WINDOW (window), demo);
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}
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if (!gtk_widget_get_visible (window))
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