Adopt shorter identifiers

Also, slightly reformat the source code according to clang-format.

1 files changed, 0 insertions, 923 deletions

diff --git a/fastiv-view.c b/fastiv-view.c
deleted file mode 100644
index 5039aec..0000000
--- a/fastiv-view.c
+++ /dev/null
@@ -1,923 +0,0 @@
-//
-// fastiv-view.c: fast image viewer - view widget
-//
-// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
-//
-// Permission to use, copy, modify, and/or distribute this software for any
-// purpose with or without fee is hereby granted.
-//
-// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
-// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
-// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-//
-
-#include "config.h"
-
-#include <math.h>
-#include <stdbool.h>
-
-#include <gtk/gtk.h>
-#ifdef GDK_WINDOWING_X11
-#include <gdk/gdkx.h>
-#endif  // GDK_WINDOWING_X11
-#ifdef GDK_WINDOWING_QUARTZ
-#include <gdk/gdkquartz.h>
-#endif  // GDK_WINDOWING_QUARTZ
-
-#include "fastiv-io.h"
-#include "fastiv-view.h"
-
-struct _FastivView {
-	GtkWidget parent_instance;
-	cairo_surface_t *image;             ///< The loaded image (sequence)
-	cairo_surface_t *page;              ///< Current page within image, weak
-	cairo_surface_t *frame;             ///< Current frame within page, weak
-	FastivIoOrientation orientation;    ///< Current page orientation
-	bool filter;                        ///< Smooth scaling toggle
-	bool scale_to_fit;                  ///< Image no larger than the allocation
-	double scale;                       ///< Scaling factor
-
-	int remaining_loops;                ///< Greater than zero if limited
-	gint64 frame_time;                  ///< Current frame's start, µs precision
-	gulong frame_update_connection;     ///< GdkFrameClock::update
-};
-
-G_DEFINE_TYPE(FastivView, fastiv_view, GTK_TYPE_WIDGET)
-
-static FastivIoOrientation view_left[9] = {
-	[FastivIoOrientationUnknown] = FastivIoOrientationUnknown,
-	[FastivIoOrientation0] = FastivIoOrientation270,
-	[FastivIoOrientationMirror0] = FastivIoOrientationMirror270,
-	[FastivIoOrientation180] = FastivIoOrientation90,
-	[FastivIoOrientationMirror180] = FastivIoOrientationMirror90,
-	[FastivIoOrientationMirror270] = FastivIoOrientationMirror180,
-	[FastivIoOrientation90] = FastivIoOrientation0,
-	[FastivIoOrientationMirror90] = FastivIoOrientationMirror0,
-	[FastivIoOrientation270] = FastivIoOrientation180
-};
-
-static FastivIoOrientation view_mirror[9] = {
-	[FastivIoOrientationUnknown] = FastivIoOrientationUnknown,
-	[FastivIoOrientation0] = FastivIoOrientationMirror0,
-	[FastivIoOrientationMirror0] = FastivIoOrientation0,
-	[FastivIoOrientation180] = FastivIoOrientationMirror180,
-	[FastivIoOrientationMirror180] = FastivIoOrientation180,
-	[FastivIoOrientationMirror270] = FastivIoOrientation270,
-	[FastivIoOrientation90] = FastivIoOrientationMirror270,
-	[FastivIoOrientationMirror90] = FastivIoOrientation90,
-	[FastivIoOrientation270] = FastivIoOrientationMirror270
-};
-
-static FastivIoOrientation view_right[9] = {
-	[FastivIoOrientationUnknown] = FastivIoOrientationUnknown,
-	[FastivIoOrientation0] = FastivIoOrientation90,
-	[FastivIoOrientationMirror0] = FastivIoOrientationMirror90,
-	[FastivIoOrientation180] = FastivIoOrientation270,
-	[FastivIoOrientationMirror180] = FastivIoOrientationMirror270,
-	[FastivIoOrientationMirror270] = FastivIoOrientationMirror0,
-	[FastivIoOrientation90] = FastivIoOrientation180,
-	[FastivIoOrientationMirror90] = FastivIoOrientationMirror180,
-	[FastivIoOrientation270] = FastivIoOrientation0
-};
-
-enum {
-	PROP_SCALE = 1,
-	PROP_SCALE_TO_FIT,
-	PROP_FILTER,
-	N_PROPERTIES
-};
-
-static GParamSpec *view_properties[N_PROPERTIES];
-
-static void
-fastiv_view_finalize(GObject *gobject)
-{
-	FastivView *self = FASTIV_VIEW(gobject);
-	cairo_surface_destroy(self->image);
-
-	G_OBJECT_CLASS(fastiv_view_parent_class)->finalize(gobject);
-}
-
-static void
-fastiv_view_get_property(
-	GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
-{
-	FastivView *self = FASTIV_VIEW(object);
-	switch (property_id) {
-	case PROP_SCALE:
-		g_value_set_double(value, self->scale);
-		break;
-	case PROP_SCALE_TO_FIT:
-		g_value_set_boolean(value, self->scale_to_fit);
-		break;
-	case PROP_FILTER:
-		g_value_set_boolean(value, self->filter);
-		break;
-	default:
-		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
-	}
-}
-
-static void
-get_surface_dimensions(FastivView *self, double *width, double *height)
-{
-	*width = *height = 0;
-	if (!self->image)
-		return;
-
-	cairo_rectangle_t extents = {};
-	switch (cairo_surface_get_type(self->page)) {
-	case CAIRO_SURFACE_TYPE_IMAGE:
-		switch (self->orientation) {
-		case FastivIoOrientation90:
-		case FastivIoOrientationMirror90:
-		case FastivIoOrientation270:
-		case FastivIoOrientationMirror270:
-			*width = cairo_image_surface_get_height(self->page);
-			*height = cairo_image_surface_get_width(self->page);
-			break;
-		default:
-			*width = cairo_image_surface_get_width(self->page);
-			*height = cairo_image_surface_get_height(self->page);
-		}
-		return;
-	case CAIRO_SURFACE_TYPE_RECORDING:
-		if (!cairo_recording_surface_get_extents(self->page, &extents)) {
-			cairo_recording_surface_ink_extents(self->page,
-				&extents.x, &extents.y, &extents.width, &extents.height);
-		}
-
-		*width = extents.width;
-		*height = extents.height;
-		return;
-	default:
-		g_assert_not_reached();
-	}
-}
-
-static void
-get_display_dimensions(FastivView *self, int *width, int *height)
-{
-	double w, h;
-	get_surface_dimensions(self, &w, &h);
-
-	*width = ceil(w * self->scale);
-	*height = ceil(h * self->scale);
-}
-
-static cairo_matrix_t
-get_orientation_matrix(FastivIoOrientation o, double width, double height)
-{
-	cairo_matrix_t matrix = {};
-	cairo_matrix_init_identity(&matrix);
-	switch (o) {
-	case FastivIoOrientation90:
-		cairo_matrix_rotate(&matrix, -M_PI_2);
-		cairo_matrix_translate(&matrix, -width, 0);
-		break;
-	case FastivIoOrientation180:
-		cairo_matrix_scale(&matrix, -1, -1);
-		cairo_matrix_translate(&matrix, -width, -height);
-		break;
-	case FastivIoOrientation270:
-		cairo_matrix_rotate(&matrix, +M_PI_2);
-		cairo_matrix_translate(&matrix, 0, -height);
-		break;
-	case FastivIoOrientationMirror0:
-		cairo_matrix_scale(&matrix, -1, +1);
-		cairo_matrix_translate(&matrix, -width, 0);
-		break;
-	case FastivIoOrientationMirror90:
-		cairo_matrix_rotate(&matrix, +M_PI_2);
-		cairo_matrix_scale(&matrix, -1, +1);
-		cairo_matrix_translate(&matrix, -width, -height);
-		break;
-	case FastivIoOrientationMirror180:
-		cairo_matrix_scale(&matrix, +1, -1);
-		cairo_matrix_translate(&matrix, 0, -height);
-		break;
-	case FastivIoOrientationMirror270:
-		cairo_matrix_rotate(&matrix, -M_PI_2);
-		cairo_matrix_scale(&matrix, -1, +1);
-	default:
-		break;
-	}
-	return matrix;
-}
-
-static void
-fastiv_view_get_preferred_height(
-	GtkWidget *widget, gint *minimum, gint *natural)
-{
-	FastivView *self = FASTIV_VIEW(widget);
-	if (self->scale_to_fit) {
-		double sw, sh;
-		get_surface_dimensions(self, &sw, &sh);
-		*natural = ceil(sh);
-		*minimum = 1;
-	} else {
-		int dw, dh;
-		get_display_dimensions(self, &dw, &dh);
-		*minimum = *natural = dh;
-	}
-}
-
-static void
-fastiv_view_get_preferred_width(GtkWidget *widget, gint *minimum, gint *natural)
-{
-	FastivView *self = FASTIV_VIEW(widget);
-	if (self->scale_to_fit) {
-		double sw, sh;
-		get_surface_dimensions(self, &sw, &sh);
-		*natural = ceil(sw);
-		*minimum = 1;
-	} else {
-		int dw, dh;
-		get_display_dimensions(self, &dw, &dh);
-		*minimum = *natural = dw;
-	}
-}
-
-static void
-fastiv_view_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
-{
-	GTK_WIDGET_CLASS(fastiv_view_parent_class)
-		->size_allocate(widget, allocation);
-
-	FastivView *self = FASTIV_VIEW(widget);
-	if (!self->image || !self->scale_to_fit)
-		return;
-
-	double w, h;
-	get_surface_dimensions(self, &w, &h);
-
-	self->scale = 1;
-	if (ceil(w * self->scale) > allocation->width)
-		self->scale = allocation->width / w;
-	if (ceil(h * self->scale) > allocation->height)
-		self->scale = allocation->height / h;
-	g_object_notify_by_pspec(G_OBJECT(widget), view_properties[PROP_SCALE]);
-}
-
-static void
-fastiv_view_realize(GtkWidget *widget)
-{
-	GtkAllocation allocation;
-	gtk_widget_get_allocation(widget, &allocation);
-
-	GdkWindowAttr attributes = {
-		.window_type = GDK_WINDOW_CHILD,
-		.x = allocation.x,
-		.y = allocation.y,
-		.width = allocation.width,
-		.height = allocation.height,
-
-		// Input-only would presumably also work (as in GtkPathBar, e.g.),
-		// but it merely seems to involve more work.
-		.wclass = GDK_INPUT_OUTPUT,
-
-		// Assuming here that we can't ask for a higher-precision Visual
-		// than what we get automatically.
-		.visual = gtk_widget_get_visual(widget),
-		.event_mask = gtk_widget_get_events(widget) | GDK_SCROLL_MASK |
-			GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK,
-	};
-
-	// We need this window to receive input events at all.
-	GdkWindow *window = gdk_window_new(gtk_widget_get_parent_window(widget),
-		&attributes, GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL);
-
-	// Without the following call, or the rendering mode set to "recording",
-	// RGB30 degrades to RGB24, because gdk_window_begin_paint_internal()
-	// creates backing stores using cairo_content_t constants.
-	//
-	// It completely breaks the Quartz backend, so limit it to X11.
-#ifdef GDK_WINDOWING_X11
-	// FIXME: This causes some flicker while scrolling, because it disables
-	// double buffering, see: https://gitlab.gnome.org/GNOME/gtk/-/issues/2560
-	//
-	// If GTK+'s OpenGL integration fails to deliver, we need to use the window
-	// directly, sidestepping the toolkit entirely.
-	if (GDK_IS_X11_WINDOW(window))
-		gdk_window_ensure_native(window);
-#endif  // GDK_WINDOWING_X11
-
-	gtk_widget_register_window(widget, window);
-	gtk_widget_set_window(widget, window);
-	gtk_widget_set_realized(widget, TRUE);
-}
-
-static gboolean
-fastiv_view_draw(GtkWidget *widget, cairo_t *cr)
-{
-	// Placed here due to our using a native GdkWindow on X11,
-	// which makes the widget have no double buffering or default background.
-	GtkAllocation allocation;
-	gtk_widget_get_allocation(widget, &allocation);
-	gtk_render_background(gtk_widget_get_style_context(widget), cr, 0, 0,
-		allocation.width, allocation.height);
-
-	FastivView *self = FASTIV_VIEW(widget);
-	if (!self->image ||
-		!gtk_cairo_should_draw_window(cr, gtk_widget_get_window(widget)))
-		return TRUE;
-
-	int w, h;
-	double sw, sh;
-	get_display_dimensions(self, &w, &h);
-	get_surface_dimensions(self, &sw, &sh);
-
-	double x = 0;
-	double y = 0;
-	if (w < allocation.width)
-		x = round((allocation.width - w) / 2.);
-	if (h < allocation.height)
-		y = round((allocation.height - h) / 2.);
-
-	// FIXME: Recording surfaces do not work well with CAIRO_SURFACE_TYPE_XLIB,
-	// we always get a shitty pixmap, where transparency contains junk.
-	if (cairo_surface_get_type(self->frame) == CAIRO_SURFACE_TYPE_RECORDING) {
-		cairo_surface_t *image =
-			cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
-		cairo_t *tcr = cairo_create(image);
-		cairo_scale(tcr, self->scale, self->scale);
-		cairo_set_source_surface(tcr, self->frame, 0, 0);
-		cairo_paint(tcr);
-		cairo_destroy(tcr);
-
-		cairo_set_source_surface(cr, image, x, y);
-		cairo_paint(cr);
-		cairo_surface_destroy(image);
-		return TRUE;
-	}
-
-	// XXX: The rounding together with padding may result in up to
-	// a pixel's worth of made-up picture data.
-	cairo_rectangle(cr, x, y, w, h);
-	cairo_clip(cr);
-
-	cairo_translate(cr, x, y);
-	cairo_scale(cr, self->scale, self->scale);
-	cairo_set_source_surface(cr, self->frame, 0, 0);
-
-	cairo_matrix_t matrix = get_orientation_matrix(self->orientation, sw, sh);
-	cairo_pattern_t *pattern = cairo_get_source(cr);
-	cairo_pattern_set_matrix(pattern, &matrix);
-	cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
-
-	// TODO(p): Prescale it ourselves to an off-screen bitmap, gamma-correctly.
-	if (self->filter)
-		cairo_pattern_set_filter(pattern, CAIRO_FILTER_GOOD);
-	else
-		cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
-
-#ifdef GDK_WINDOWING_QUARTZ
-	// Not supported there. Acts a bit like repeating, but weirdly offset.
-	if (GDK_IS_QUARTZ_WINDOW(gtk_widget_get_window(widget)))
-		cairo_pattern_set_extend(pattern, CAIRO_EXTEND_NONE);
-#endif  // GDK_WINDOWING_QUARTZ
-
-	cairo_paint(cr);
-	return TRUE;
-}
-
-static gboolean
-fastiv_view_button_press_event(GtkWidget *widget, GdkEventButton *event)
-{
-	GTK_WIDGET_CLASS(fastiv_view_parent_class)
-		->button_press_event(widget, event);
-
-	if (event->button == GDK_BUTTON_PRIMARY &&
-		gtk_widget_get_focus_on_click(widget))
-		gtk_widget_grab_focus(widget);
-
-	// TODO(p): Use for left button scroll drag, which may rather be a gesture.
-	return FALSE;
-}
-
-#define SCALE_STEP 1.4
-
-static gboolean
-set_scale_to_fit(FastivView *self, bool scale_to_fit)
-{
-	self->scale_to_fit = scale_to_fit;
-
-	gtk_widget_queue_resize(GTK_WIDGET(self));
-	g_object_notify_by_pspec(
-		G_OBJECT(self), view_properties[PROP_SCALE_TO_FIT]);
-	return TRUE;
-}
-
-static gboolean
-set_scale(FastivView *self, double scale)
-{
-	self->scale = scale;
-	g_object_notify_by_pspec(
-		G_OBJECT(self), view_properties[PROP_SCALE]);
-	return set_scale_to_fit(self, false);
-}
-
-static gboolean
-fastiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
-{
-	FastivView *self = FASTIV_VIEW(widget);
-	if (!self->image)
-		return FALSE;
-	if (event->state & gtk_accelerator_get_default_mod_mask())
-		return FALSE;
-
-	switch (event->direction) {
-	case GDK_SCROLL_UP:
-		return set_scale(self, self->scale * SCALE_STEP);
-	case GDK_SCROLL_DOWN:
-		return set_scale(self, self->scale / SCALE_STEP);
-	default:
-		// For some reason, we can also get GDK_SCROLL_SMOOTH.
-		// Left/right are good to steal from GtkScrolledWindow for consistency.
-		return TRUE;
-	}
-}
-
-static void
-stop_animating(FastivView *self)
-{
-	GdkFrameClock *clock = gtk_widget_get_frame_clock(GTK_WIDGET(self));
-	if (!clock || !self->frame_update_connection)
-		return;
-
-	g_signal_handler_disconnect(clock, self->frame_update_connection);
-	gdk_frame_clock_end_updating(clock);
-
-	self->frame_time = 0;
-	self->frame_update_connection = 0;
-	self->remaining_loops = 0;
-}
-
-static gboolean
-advance_frame(FastivView *self)
-{
-	cairo_surface_t *next =
-		cairo_surface_get_user_data(self->frame, &fastiv_io_key_frame_next);
-	if (next) {
-		self->frame = next;
-	} else {
-		if (self->remaining_loops && !--self->remaining_loops)
-			return FALSE;
-
-		self->frame = self->page;
-	}
-	return TRUE;
-}
-
-static gboolean
-advance_animation(FastivView *self, GdkFrameClock *clock)
-{
-	gint64 now = gdk_frame_clock_get_frame_time(clock);
-	while (true) {
-		// TODO(p): See if infinite frames can actually happen, and how.
-		intptr_t duration = (intptr_t) cairo_surface_get_user_data(
-			self->frame, &fastiv_io_key_frame_duration);
-		if (duration < 0)
-			return FALSE;
-
-		// Do not busy loop. GIF timings are given in hundredths of a second.
-		// Note that browsers seem to do [< 10] => 100:
-		// https://bugs.webkit.org/show_bug.cgi?id=36082
-		if (duration == 0)
-			duration = gdk_frame_timings_get_refresh_interval(
-				gdk_frame_clock_get_current_timings(clock)) / 1000;
-		if (duration == 0)
-			duration = 1;
-
-		gint64 then = self->frame_time + duration * 1000;
-		if (then > now)
-			return TRUE;
-		if (!advance_frame(self))
-			return FALSE;
-
-		self->frame_time = then;
-		gtk_widget_queue_draw(GTK_WIDGET(self));
-	}
-}
-
-static void
-on_frame_clock_update(GdkFrameClock *clock, gpointer user_data)
-{
-	FastivView *self = FASTIV_VIEW(user_data);
-	if (!advance_animation(self, clock))
-		stop_animating(self);
-}
-
-static void
-start_animating(FastivView *self)
-{
-	stop_animating(self);
-
-	GdkFrameClock *clock = gtk_widget_get_frame_clock(GTK_WIDGET(self));
-	if (!clock || !self->image ||
-		!cairo_surface_get_user_data(self->page, &fastiv_io_key_frame_next))
-		return;
-
-	self->frame_time = gdk_frame_clock_get_frame_time(clock);
-	self->frame_update_connection = g_signal_connect(
-		clock, "update", G_CALLBACK(on_frame_clock_update), self);
-	self->remaining_loops = (uintptr_t) cairo_surface_get_user_data(
-		self->page, &fastiv_io_key_loops);
-
-	gdk_frame_clock_begin_updating(clock);
-}
-
-static void
-switch_page(FastivView *self, cairo_surface_t *page)
-{
-	self->frame = self->page = page;
-	if ((self->orientation = (uintptr_t) cairo_surface_get_user_data(
-			 self->page, &fastiv_io_key_orientation)) ==
-		FastivIoOrientationUnknown)
-		self->orientation = FastivIoOrientation0;
-
-	start_animating(self);
-	gtk_widget_queue_resize(GTK_WIDGET(self));
-}
-
-static void
-fastiv_view_map(GtkWidget *widget)
-{
-	GTK_WIDGET_CLASS(fastiv_view_parent_class)->map(widget);
-
-	// Loading before mapping will fail to obtain a GdkFrameClock.
-	start_animating(FASTIV_VIEW(widget));
-}
-
-void
-fastiv_view_unmap(GtkWidget *widget)
-{
-	stop_animating(FASTIV_VIEW(widget));
-	GTK_WIDGET_CLASS(fastiv_view_parent_class)->unmap(widget);
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void
-show_error_dialog(GtkWindow *parent, GError *error)
-{
-	GtkWidget *dialog = gtk_message_dialog_new(parent, GTK_DIALOG_MODAL,
-		GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", error->message);
-	gtk_dialog_run(GTK_DIALOG(dialog));
-	gtk_widget_destroy(dialog);
-	g_error_free(error);
-}
-
-static GtkWindow *
-get_toplevel(GtkWidget *widget)
-{
-	if (GTK_IS_WINDOW((widget = gtk_widget_get_toplevel(widget))))
-		return GTK_WINDOW(widget);
-	return NULL;
-}
-
-static void
-on_draw_page(G_GNUC_UNUSED GtkPrintOperation *operation,
-	GtkPrintContext *context, G_GNUC_UNUSED int page_nr, FastivView *self)
-{
-	double surface_width_px = 0, surface_height_px = 0;
-	get_surface_dimensions(self, &surface_width_px, &surface_height_px);
-
-	// Any DPI will be wrong, unless we import that information from the image.
-	double scale = 1 / 96.;
-	double w = surface_width_px * scale, h = surface_height_px * scale;
-
-	// Scale down to fit the print area, taking care to not divide by zero.
-	double areaw = gtk_print_context_get_width(context);
-	double areah = gtk_print_context_get_height(context);
-	scale *= fmin((areaw < w) ? areaw / w : 1, (areah < h) ? areah / h : 1);
-
-	cairo_t *cr = gtk_print_context_get_cairo_context(context);
-	cairo_scale(cr, scale, scale);
-	cairo_set_source_surface(cr, self->frame, 0, 0);
-	cairo_matrix_t matrix = get_orientation_matrix(
-		self->orientation, surface_width_px, surface_height_px);
-	cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
-	cairo_paint(cr);
-}
-
-static gboolean
-print(FastivView *self)
-{
-	GtkPrintOperation *print = gtk_print_operation_new();
-	gtk_print_operation_set_n_pages(print, 1);
-	gtk_print_operation_set_embed_page_setup(print, TRUE);
-	gtk_print_operation_set_unit(print, GTK_UNIT_INCH);
-	gtk_print_operation_set_job_name(print, "Image");
-	g_signal_connect(print, "draw-page", G_CALLBACK(on_draw_page), self);
-
-	static GtkPrintSettings *settings = NULL;
-	if (settings != NULL)
-		gtk_print_operation_set_print_settings(print, settings);
-
-	GError *error = NULL;
-	GtkWindow *window = get_toplevel(GTK_WIDGET(self));
-	GtkPrintOperationResult res = gtk_print_operation_run(
-		print, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG, window, &error);
-	if (res == GTK_PRINT_OPERATION_RESULT_APPLY) {
-		if (settings != NULL)
-			g_object_unref(settings);
-		settings = g_object_ref(gtk_print_operation_get_print_settings(print));
-	}
-	if (error)
-		show_error_dialog(window, error);
-
-	g_object_unref(print);
-	return TRUE;
-}
-
-static gboolean
-save_as(FastivView *self, gboolean frame)
-{
-	GtkWindow *window = get_toplevel(GTK_WIDGET(self));
-	GtkWidget *dialog = gtk_file_chooser_dialog_new(
-		frame ? "Save frame as" : "Save page as",
-		window, GTK_FILE_CHOOSER_ACTION_SAVE,
-		"_Cancel", GTK_RESPONSE_CANCEL, "_Save", GTK_RESPONSE_ACCEPT, NULL);
-
-	GtkFileChooser *chooser = GTK_FILE_CHOOSER(dialog);
-
-	// TODO(p): Consider a hard dependency on libwebp, or clean this up.
-#ifdef HAVE_LIBWEBP
-	// This is the best general format: supports lossless encoding, animations,
-	// alpha channel, and Exif and ICC profile metadata.
-	// PNG is another viable option, but sPNG can't do APNG, Wuffs can't save,
-	// and libpng is a pain in the arse.
-	GtkFileFilter *webp_filter = gtk_file_filter_new();
-	gtk_file_filter_add_mime_type(webp_filter, "image/webp");
-	gtk_file_filter_add_pattern(webp_filter, "*.webp");
-	gtk_file_filter_set_name(webp_filter, "Lossless WebP");
-	gtk_file_chooser_add_filter(chooser, webp_filter);
-
-	// TODO(p): Derive it from the currently displayed filename,
-	// and set the directory to the same place.
-	gtk_file_chooser_set_current_name(
-		chooser, frame ? "frame.webp" : "page.webp");
-#endif  // HAVE_LIBWEBP
-
-	// The format is supported by Exiv2 and ExifTool.
-	// This is mostly a developer tool.
-	GtkFileFilter *exv_filter = gtk_file_filter_new();
-	gtk_file_filter_add_mime_type(exv_filter, "image/x-exv");
-	gtk_file_filter_add_pattern(exv_filter, "*.exv");
-	gtk_file_filter_set_name(exv_filter, "Exiv2 metadata");
-	gtk_file_chooser_add_filter(chooser, exv_filter);
-
-	switch (gtk_dialog_run(GTK_DIALOG(dialog))) {
-		gchar *path;
-	case GTK_RESPONSE_ACCEPT:
-		path = gtk_file_chooser_get_filename(chooser);
-
-		GError *error = NULL;
-#ifdef HAVE_LIBWEBP
-		if (gtk_file_chooser_get_filter(chooser) == webp_filter)
-			fastiv_io_save(self->page,
-				frame ? self->frame : NULL, path, &error);
-		else
-#endif  // HAVE_LIBWEBP
-			fastiv_io_save_metadata(self->page, path, &error);
-		if (error)
-			show_error_dialog(window, error);
-		g_free(path);
-
-		// Fall-through.
-	default:
-		gtk_widget_destroy(dialog);
-		// Fall-through.
-	case GTK_RESPONSE_NONE:
-		return TRUE;
-	}
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static inline gboolean
-command(FastivView *self, FastivViewCommand command)
-{
-	fastiv_view_command(self, command);
-	return TRUE;
-}
-
-static gboolean
-fastiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
-{
-	FastivView *self = FASTIV_VIEW(widget);
-	if (!self->image)
-		return FALSE;
-
-	// It should not matter that GDK_KEY_plus involves holding Shift.
-	guint state = event->state & gtk_accelerator_get_default_mod_mask() &
-		~GDK_SHIFT_MASK;
-
-	// The standard, intuitive bindings.
-	if (state == GDK_CONTROL_MASK) {
-		switch (event->keyval) {
-		case GDK_KEY_0:
-			return command(self, FASTIV_VIEW_COMMAND_ZOOM_1);
-		case GDK_KEY_plus:
-			return command(self, FASTIV_VIEW_COMMAND_ZOOM_IN);
-		case GDK_KEY_minus:
-			return command(self, FASTIV_VIEW_COMMAND_ZOOM_OUT);
-		case GDK_KEY_p:
-			return command(self, FASTIV_VIEW_COMMAND_PRINT);
-		case GDK_KEY_s:
-			return command(self, FASTIV_VIEW_COMMAND_SAVE_PAGE);
-		case GDK_KEY_S:
-			return save_as(self, TRUE);
-		}
-	}
-	if (state != 0)
-		return FALSE;
-
-	switch (event->keyval) {
-	case GDK_KEY_1:
-	case GDK_KEY_2:
-	case GDK_KEY_3:
-	case GDK_KEY_4:
-	case GDK_KEY_5:
-	case GDK_KEY_6:
-	case GDK_KEY_7:
-	case GDK_KEY_8:
-	case GDK_KEY_9:
-		return set_scale(self, event->keyval - GDK_KEY_0);
-	case GDK_KEY_plus:
-		return command(self, FASTIV_VIEW_COMMAND_ZOOM_IN);
-	case GDK_KEY_minus:
-		return command(self, FASTIV_VIEW_COMMAND_ZOOM_OUT);
-
-	case GDK_KEY_x:  // Inspired by gThumb.
-		return set_scale_to_fit(self, !self->scale_to_fit);
-
-	case GDK_KEY_i:
-		self->filter = !self->filter;
-		g_object_notify_by_pspec(
-			G_OBJECT(self), view_properties[PROP_FILTER]);
-		gtk_widget_queue_draw(widget);
-		return TRUE;
-
-	case GDK_KEY_less:
-		return command(self, FASTIV_VIEW_COMMAND_ROTATE_LEFT);
-	case GDK_KEY_equal:
-		return command(self, FASTIV_VIEW_COMMAND_MIRROR);
-	case GDK_KEY_greater:
-		return command(self, FASTIV_VIEW_COMMAND_ROTATE_RIGHT);
-
-	case GDK_KEY_bracketleft:
-		return command(self, FASTIV_VIEW_COMMAND_PAGE_PREVIOUS);
-	case GDK_KEY_bracketright:
-		return command(self, FASTIV_VIEW_COMMAND_PAGE_NEXT);
-
-	case GDK_KEY_braceleft:
-		return command(self, FASTIV_VIEW_COMMAND_FRAME_PREVIOUS);
-	case GDK_KEY_braceright:
-		return command(self, FASTIV_VIEW_COMMAND_FRAME_NEXT);
-	}
-	return FALSE;
-}
-
-static void
-fastiv_view_class_init(FastivViewClass *klass)
-{
-	GObjectClass *object_class = G_OBJECT_CLASS(klass);
-	object_class->finalize = fastiv_view_finalize;
-	object_class->get_property = fastiv_view_get_property;
-
-	view_properties[PROP_SCALE] = g_param_spec_double(
-		"scale", "Scale", "Zoom level",
-		0, G_MAXDOUBLE, 1.0, G_PARAM_READABLE);
-	view_properties[PROP_SCALE_TO_FIT] = g_param_spec_boolean(
-		"scale-to-fit", "Scale to fit", "Scale images down to fit the window",
-		TRUE, G_PARAM_READABLE);
-	view_properties[PROP_FILTER] = g_param_spec_boolean(
-		"filter", "Use filtering", "Scale images smoothly",
-		TRUE, G_PARAM_READABLE);
-	g_object_class_install_properties(
-		object_class, N_PROPERTIES, view_properties);
-
-	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
-	widget_class->get_preferred_height = fastiv_view_get_preferred_height;
-	widget_class->get_preferred_width = fastiv_view_get_preferred_width;
-	widget_class->size_allocate = fastiv_view_size_allocate;
-	widget_class->map = fastiv_view_map;
-	widget_class->unmap = fastiv_view_unmap;
-	widget_class->realize = fastiv_view_realize;
-	widget_class->draw = fastiv_view_draw;
-	widget_class->button_press_event = fastiv_view_button_press_event;
-	widget_class->scroll_event = fastiv_view_scroll_event;
-	widget_class->key_press_event = fastiv_view_key_press_event;
-
-	// TODO(p): Later override "screen_changed", recreate Pango layouts there,
-	// if we get to have any, or otherwise reflect DPI changes.
-	gtk_widget_class_set_css_name(widget_class, "fastiv-view");
-}
-
-static void
-fastiv_view_init(FastivView *self)
-{
-	gtk_widget_set_can_focus(GTK_WIDGET(self), TRUE);
-
-	self->filter = true;
-	self->scale = 1.0;
-}
-
-// --- Picture loading ---------------------------------------------------------
-
-// TODO(p): Progressive picture loading, or at least async/cancellable.
-gboolean
-fastiv_view_open(FastivView *self, const gchar *path, GError **error)
-{
-	cairo_surface_t *surface = fastiv_io_open(path, error);
-	if (!surface)
-		return FALSE;
-	if (self->image)
-		cairo_surface_destroy(self->image);
-
-	self->frame = self->page = NULL;
-	self->image = surface;
-	switch_page(self, self->image);
-	set_scale_to_fit(self, true);
-	return TRUE;
-}
-
-static void
-page_step(FastivView *self, int step)
-{
-	cairo_user_data_key_t *key =
-		step < 0 ? &fastiv_io_key_page_previous : &fastiv_io_key_page_next;
-	cairo_surface_t *page = cairo_surface_get_user_data(self->page, key);
-	if (page)
-		switch_page(self, page);
-}
-
-static void
-frame_step(FastivView *self, int step)
-{
-	stop_animating(self);
-	cairo_user_data_key_t *key =
-		step < 0 ? &fastiv_io_key_frame_previous : &fastiv_io_key_frame_next;
-	if (!step || !(self->frame = cairo_surface_get_user_data(self->frame, key)))
-		self->frame = self->page;
-	gtk_widget_queue_draw(GTK_WIDGET(self));
-}
-
-void
-fastiv_view_command(FastivView *self, FastivViewCommand command)
-{
-	g_return_if_fail(FASTIV_IS_VIEW(self));
-
-	GtkWidget *widget = GTK_WIDGET(self);
-	if (!self->image)
-		return;
-
-	switch (command) {
-	break; case FASTIV_VIEW_COMMAND_ROTATE_LEFT:
-		self->orientation = view_left[self->orientation];
-		gtk_widget_queue_resize(widget);
-	break; case FASTIV_VIEW_COMMAND_MIRROR:
-		self->orientation = view_mirror[self->orientation];
-		gtk_widget_queue_resize(widget);
-	break; case FASTIV_VIEW_COMMAND_ROTATE_RIGHT:
-		self->orientation = view_right[self->orientation];
-		gtk_widget_queue_resize(widget);
-
-	break; case FASTIV_VIEW_COMMAND_PAGE_FIRST:
-		switch_page(self, self->image);
-	break; case FASTIV_VIEW_COMMAND_PAGE_PREVIOUS:
-		page_step(self, -1);
-	break; case FASTIV_VIEW_COMMAND_PAGE_NEXT:
-		page_step(self, +1);
-	break; case FASTIV_VIEW_COMMAND_PAGE_LAST:
-		for (cairo_surface_t *s = self->page;
-			 (s = cairo_surface_get_user_data(s, &fastiv_io_key_page_next)); )
-			self->page = s;
-		switch_page(self, self->page);
-
-	break; case FASTIV_VIEW_COMMAND_FRAME_FIRST:
-		frame_step(self, 0);
-	break; case FASTIV_VIEW_COMMAND_FRAME_PREVIOUS:
-		frame_step(self, -1);
-	break; case FASTIV_VIEW_COMMAND_FRAME_NEXT:
-		frame_step(self, +1);
-
-	break; case FASTIV_VIEW_COMMAND_PRINT:
-		print(self);
-	break; case FASTIV_VIEW_COMMAND_SAVE_PAGE:
-		save_as(self, FALSE);
-
-	break; case FASTIV_VIEW_COMMAND_ZOOM_IN:
-		set_scale(self, self->scale * SCALE_STEP);
-	break; case FASTIV_VIEW_COMMAND_ZOOM_OUT:
-		set_scale(self, self->scale / SCALE_STEP);
-	break; case FASTIV_VIEW_COMMAND_ZOOM_1:
-		set_scale(self, 1.0);
-	}
-}