1 | #include <gtk/gtk.h> |
2 | |
3 | |
4 | |
5 | typedef struct _GtkTextureView GtkTextureView; |
6 | typedef struct _GtkTextureViewClass GtkTextureViewClass; |
7 | |
8 | #define GTK_TYPE_TEXTURE_VIEW (gtk_texture_view_get_type ()) |
9 | #define GTK_TEXTURE_VIEW(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GTK_TYPE_TEXTURE_VIEW, GtkTextureView)) |
10 | #define GTK_TEXTURE_VIEW_CLASS(cls) (G_TYPE_CHECK_CLASS_CAST(cls, GTK_TYPE_TEXTURE_VIEW, GtkTextureViewClass)) |
11 | struct _GtkTextureView |
12 | { |
13 | GtkWidget parent_instance; |
14 | |
15 | GdkTexture *texture; |
16 | }; |
17 | |
18 | struct _GtkTextureViewClass |
19 | { |
20 | GtkWidgetClass parent_class; |
21 | }; |
22 | |
23 | GType gtk_texture_view_get_type (void) G_GNUC_CONST; |
24 | |
25 | |
26 | G_DEFINE_TYPE(GtkTextureView, gtk_texture_view, GTK_TYPE_WIDGET) |
27 | |
28 | static void |
29 | gtk_texture_view_measure (GtkWidget *widget, |
30 | GtkOrientation orientation, |
31 | int for_size, |
32 | int *minimum, |
33 | int *natural, |
34 | int *minimum_baseline, |
35 | int *natural_baseline) |
36 | { |
37 | GtkTextureView *self = GTK_TEXTURE_VIEW (widget); |
38 | |
39 | if (self->texture == NULL) |
40 | return; |
41 | |
42 | if (orientation == GTK_ORIENTATION_HORIZONTAL) |
43 | { |
44 | *minimum = 0; |
45 | *natural = gdk_texture_get_width (texture: self->texture); |
46 | } |
47 | else /* VERTICAL */ |
48 | { |
49 | *minimum = 0; |
50 | *natural = gdk_texture_get_height (texture: self->texture); |
51 | } |
52 | } |
53 | |
54 | static void |
55 | gtk_texture_view_snapshot (GtkWidget *widget, |
56 | GtkSnapshot *snapshot) |
57 | { |
58 | GtkTextureView *self = GTK_TEXTURE_VIEW (widget); |
59 | int width = gtk_widget_get_width (widget); |
60 | int height = gtk_widget_get_height (widget); |
61 | |
62 | if (self->texture != NULL) |
63 | { |
64 | graphene_rect_t bounds; |
65 | |
66 | bounds.origin.x = MAX (0, width / 2 - gdk_texture_get_width (self->texture)); |
67 | bounds.origin.y = MAX (0, height / 2 - gdk_texture_get_height (self->texture)); |
68 | |
69 | bounds.size.width = MIN (width, gdk_texture_get_width (self->texture)); |
70 | bounds.size.height = MIN (height, gdk_texture_get_height (self->texture)); |
71 | |
72 | gtk_snapshot_append_texture (snapshot, texture: self->texture, bounds: &bounds); |
73 | } |
74 | } |
75 | |
76 | static void |
77 | gtk_texture_view_finalize (GObject *object) |
78 | { |
79 | GtkTextureView *self = GTK_TEXTURE_VIEW (object); |
80 | |
81 | g_clear_object (&self->texture); |
82 | |
83 | G_OBJECT_CLASS (gtk_texture_view_parent_class)->finalize (object); |
84 | } |
85 | |
86 | static void |
87 | gtk_texture_view_init (GtkTextureView *self) |
88 | { |
89 | } |
90 | |
91 | static void |
92 | gtk_texture_view_class_init (GtkTextureViewClass *klass) |
93 | { |
94 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
95 | GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); |
96 | |
97 | object_class->finalize = gtk_texture_view_finalize; |
98 | |
99 | widget_class->measure = gtk_texture_view_measure; |
100 | widget_class->snapshot = gtk_texture_view_snapshot; |
101 | } |
102 | |
103 | static void |
104 | quit_cb (GtkWidget *widget, |
105 | gpointer data) |
106 | { |
107 | gboolean *done = data; |
108 | |
109 | *done = TRUE; |
110 | |
111 | g_main_context_wakeup (NULL); |
112 | } |
113 | |
114 | int |
115 | main (int argc, char **argv) |
116 | { |
117 | GtkWidget *window; |
118 | GtkWidget *view; |
119 | GdkTexture *texture; |
120 | GFile *file; |
121 | GError *error = NULL; |
122 | gboolean done = FALSE; |
123 | |
124 | gtk_init (); |
125 | |
126 | if (argc != 2) |
127 | { |
128 | g_error ("No texture file path given." ); |
129 | return -1; |
130 | } |
131 | |
132 | file = g_file_new_for_path (path: argv[1]); |
133 | texture = gdk_texture_new_from_file (file, error: &error); |
134 | |
135 | if (error != NULL) |
136 | { |
137 | g_error ("Error: %s" , error->message); |
138 | return -1; |
139 | } |
140 | |
141 | window = gtk_window_new (); |
142 | g_signal_connect (window, "destroy" , G_CALLBACK (quit_cb), &done); |
143 | view = g_object_new (GTK_TYPE_TEXTURE_VIEW, NULL); |
144 | ((GtkTextureView*)view)->texture = g_steal_pointer (&texture); |
145 | |
146 | gtk_window_set_child (GTK_WINDOW (window), child: view); |
147 | |
148 | gtk_widget_show (widget: window); |
149 | |
150 | while (!done) |
151 | g_main_context_iteration (NULL, TRUE); |
152 | |
153 | g_object_unref (object: file); |
154 | |
155 | return 0; |
156 | } |
157 | |