Fourth commit

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 223 insertions, 0 deletions

diff --git a/preferences.c b/preferences.c
new file mode 100644
index 0000000..e4d73e2
--- /dev/null
+++ b/preferences.c
@@ -0,0 +1,223 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+#define LIST_SCALING_FILTERS(X, ...)\
+	X(0, CAIRO_FILTER_NEAREST,  "Nearest") __VA_ARGS__\
+	X(1, CAIRO_FILTER_BILINEAR, "Bilinear") __VA_ARGS__\
+	X(2, CAIRO_FILTER_GAUSSIAN, "Gaussian")
+
+cairo_filter_t scaling_filter = CAIRO_FILTER_BILINEAR;
+GdkColor chequer_colours[2] = {
+	{0u, 0xD3D3u, 0xD3D3u, 0xD3D3u},
+	{0u, 0xFFFFu, 0xFFFFu, 0xFFFFu}
+};
+uint16_t chequer_alphas[2] = {0xFFFFu, 0xFFFFu};
+int chequered_background = 0;
+int chequer_size = 16;
+
+static GtkWidget *preferences_window;
+static GtkWidget *transparency_controls;
+
+static void
+preferences_response(GtkDialog *dialog, int response, void *user)
+{
+	(void) response;
+	(void) user;
+	gtk_widget_destroy(GTK_WIDGET(dialog));
+}
+
+static void
+preferences_destroyed(GtkWidget *widget, void *user)
+{
+	(void) widget;
+	(void) user;
+	preferences_window = NULL;
+}
+
+static void
+scaling_filter_changed(GtkComboBox *box, void *user)
+{
+	(void) user;
+	switch (gtk_combo_box_get_active(box)) {
+#define X(I, V, T) case I: scaling_filter = V; break
+	LIST_SCALING_FILTERS(X, ;);
+#undef X
+	default:
+		abort();
+	}
+	gtk_widget_queue_draw(display_area);
+}
+
+static void
+chequered_background_changed(GtkToggleButton *button, void *user)
+{
+	(void) user;
+	chequered_background = gtk_toggle_button_get_active(button);
+	gtk_widget_set_sensitive(transparency_controls, chequered_background);
+	gtk_widget_queue_draw(display_area);
+}
+
+static void
+transparency_colour_changed(GtkColorButton *button, void *user)
+{
+	GdkColor *colour = user;
+	size_t index = (size_t)(colour - chequer_colours);
+	gtk_color_button_get_color(button, colour);
+	chequer_alphas[index] = gtk_color_button_get_alpha(button);
+	gtk_widget_queue_draw(display_area);
+}
+
+static void
+chequer_size_changed(GtkSpinButton *button, void *user)
+{
+	(void) user;
+	chequer_size = gtk_spin_button_get_value_as_int(button);
+	gtk_widget_queue_draw(display_area);
+}
+
+static GtkWidget *
+new_section(const char *title)
+{
+	GtkWidget *frame = gtk_frame_new(title);
+	GtkWidget *box = gtk_vbox_new(0, 6);
+	gtk_container_set_border_width(GTK_CONTAINER(box), 6u);
+	gtk_container_add(GTK_CONTAINER(frame), box);
+	return frame;
+}
+
+static GtkWidget *
+new_scaling_section(void)
+{
+	GtkWidget *section = new_section("Scaling");
+	GtkWidget *box = gtk_bin_get_child(GTK_BIN(section));
+	GtkWidget *row = gtk_hbox_new(0, 6);
+	GtkWidget *label = gtk_label_new_with_mnemonic("_Algorithm:");
+	GtkWidget *filters = gtk_combo_box_new_text();
+
+#define X(I, V, T) gtk_combo_box_append_text(GTK_COMBO_BOX(filters), T)
+	LIST_SCALING_FILTERS(X, ;);
+#undef X
+
+	switch (scaling_filter) {
+#define X(I, V, T) case V: gtk_combo_box_set_active(GTK_COMBO_BOX(filters), I); break
+	LIST_SCALING_FILTERS(X, ;);
+#undef X
+	case CAIRO_FILTER_FAST:
+	case CAIRO_FILTER_GOOD:
+	case CAIRO_FILTER_BEST:
+	default:
+		abort();
+	}
+
+	gtk_label_set_mnemonic_widget(GTK_LABEL(label), filters);
+	gtk_box_pack_start(GTK_BOX(row), label, 0, 0, 0u);
+	gtk_box_pack_start(GTK_BOX(row), filters, 0, 0, 0u);
+	gtk_box_pack_start(GTK_BOX(box), row, 0, 0, 0u);
+	g_signal_connect(filters, "changed", G_CALLBACK(&scaling_filter_changed), NULL);
+	return section;
+}
+
+#ifdef TODO
+static GtkWidget *
+new_unimplemented_section(void)
+{
+	GtkWidget *section = new_section("Image handling");
+	GtkWidget *box = gtk_bin_get_child(GTK_BIN(section));
+	GtkWidget *orientation;
+	GtkWidget *physical_size;
+
+	orientation = gtk_check_button_new_with_mnemonic("Apply embedded _orientation");
+	physical_size = gtk_check_button_new_with_mnemonic("Normal size is _physical size");
+	gtk_box_pack_start(GTK_BOX(box), orientation, 0, 0, 0u);
+	gtk_box_pack_start(GTK_BOX(box), physical_size, 0, 0, 0u);
+	return section;
+}
+#endif
+
+static GtkWidget *
+new_transparency_section(void)
+{
+	GtkWidget *section = new_section("Transparent images");
+	GtkWidget *box = gtk_bin_get_child(GTK_BIN(section));
+	GtkWidget *enabled;
+	GtkWidget *first;
+	GtkWidget *second;
+	GtkWidget *size;
+	GtkWidget *label;
+	GtkWidget *units;
+
+	enabled = gtk_check_button_new_with_mnemonic("Use che_quered background");
+	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(enabled), chequered_background);
+	gtk_box_pack_start(GTK_BOX(box), enabled, 0, 0, 0u);
+	transparency_controls = gtk_table_new(3u, 3u, 0);
+	gtk_table_set_row_spacings(GTK_TABLE(transparency_controls), 3u);
+	gtk_table_set_col_spacings(GTK_TABLE(transparency_controls), 6u);
+	gtk_box_pack_start(GTK_BOX(box), transparency_controls, 0, 0, 0u);
+
+	label = gtk_label_new_with_mnemonic("_First colour:");
+	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
+	first = gtk_color_button_new_with_color(&chequer_colours[0]);
+	gtk_color_button_set_use_alpha(GTK_COLOR_BUTTON(first), 1);
+	gtk_color_button_set_alpha(GTK_COLOR_BUTTON(first), chequer_alphas[0]);
+	gtk_label_set_mnemonic_widget(GTK_LABEL(label), first);
+	gtk_table_attach(GTK_TABLE(transparency_controls), label, 0u, 1u, 0u, 1u, GTK_FILL, GTK_FILL, 0u, 0u);
+	gtk_table_attach(GTK_TABLE(transparency_controls), first, 1u, 2u, 0u, 1u, GTK_FILL, GTK_FILL, 0u, 0u);
+
+	label = gtk_label_new_with_mnemonic("_Second colour:");
+	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
+	second = gtk_color_button_new_with_color(&chequer_colours[1]);
+	gtk_color_button_set_use_alpha(GTK_COLOR_BUTTON(second), 1);
+	gtk_color_button_set_alpha(GTK_COLOR_BUTTON(second), chequer_alphas[1]);
+	gtk_label_set_mnemonic_widget(GTK_LABEL(label), second);
+	gtk_table_attach(GTK_TABLE(transparency_controls), label, 0u, 1u, 1u, 2u, GTK_FILL, GTK_FILL, 0u, 0u);
+	gtk_table_attach(GTK_TABLE(transparency_controls), second, 1u, 2u, 1u, 2u, GTK_FILL, GTK_FILL, 0u, 0u);
+
+	label = gtk_label_new_with_mnemonic("Chequer si_ze:");
+	gtk_misc_set_alignment(GTK_MISC(label), 0.0, 0.5);
+	size = gtk_spin_button_new_with_range(1.0, 256.0, 1.0);
+	units = gtk_label_new("pixels");
+	gtk_misc_set_alignment(GTK_MISC(units), 0.0, 0.5);
+	gtk_spin_button_set_value(GTK_SPIN_BUTTON(size), (double)chequer_size);
+	gtk_label_set_mnemonic_widget(GTK_LABEL(label), size);
+	gtk_table_attach(GTK_TABLE(transparency_controls), label, 0u, 1u, 2u, 3u, GTK_FILL, GTK_FILL, 0u, 0u);
+	gtk_table_attach(GTK_TABLE(transparency_controls), size, 1u, 2u, 2u, 3u, GTK_FILL, GTK_FILL, 0u, 0u);
+	gtk_table_attach(GTK_TABLE(transparency_controls), units, 2u, 3u, 2u, 3u, GTK_FILL, GTK_FILL, 0u, 0u);
+
+	gtk_widget_set_sensitive(transparency_controls, chequered_background);
+	g_signal_connect(enabled, "toggled", G_CALLBACK(&chequered_background_changed), NULL);
+	g_signal_connect(first, "color-set", G_CALLBACK(&transparency_colour_changed), &chequer_colours[0]);
+	g_signal_connect(second, "color-set", G_CALLBACK(&transparency_colour_changed), &chequer_colours[1]);
+	g_signal_connect(size, "value-changed", G_CALLBACK(&chequer_size_changed), NULL);
+	return section;
+}
+
+void
+open_preferences(void)
+{
+	GtkWidget *alignment, *box;
+
+	if (preferences_window) {
+		gtk_window_present(GTK_WINDOW(preferences_window));
+		return;
+	}
+
+	preferences_window = gtk_dialog_new_with_buttons("Preferences", GTK_WINDOW(window), GTK_DIALOG_DESTROY_WITH_PARENT,
+	                                                  GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE, NULL);
+
+	alignment = gtk_alignment_new(0.0, 0.0, 1.0, 1.0);
+	gtk_alignment_set_padding(GTK_ALIGNMENT(alignment), 6u, 6u, 6u, 6u);
+	gtk_box_pack_start(GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(preferences_window))), alignment, 1, 1, 0u);
+	box = gtk_vbox_new(0, 6);
+	gtk_container_add(GTK_CONTAINER(alignment), box);
+
+	gtk_box_pack_start(GTK_BOX(box), new_scaling_section(), 0, 0, 0u);
+#ifdef TODO
+	gtk_box_pack_start(GTK_BOX(box), new_unimplemented_section(), 0, 0, 0u);
+#endif
+	gtk_box_pack_start(GTK_BOX(box), new_transparency_section(), 0, 0, 0u);
+
+	g_signal_connect(preferences_window, "response", G_CALLBACK(&preferences_response), NULL);
+	g_signal_connect(preferences_window, "destroy", G_CALLBACK(&preferences_destroyed), NULL);
+
+	gtk_widget_show_all(preferences_window);
+}