fiv/fiv-view.c

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2021-07-14 07:09:19 +02:00
//
// fiv-view.c: fast image viewer - view widget
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//
// 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 "fiv-io.h"
#include "fiv-view.h"
#include <math.h>
#include <stdbool.h>
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#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
struct _FivView {
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GtkWidget parent_instance;
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gchar *path; ///< Path to the current image (if any)
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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
FivIoOrientation orientation; ///< Current page orientation
bool enable_cms : 1; ///< Smooth scaling toggle
bool filter : 1; ///< Smooth scaling toggle
bool checkerboard : 1; ///< Show checkerboard background
bool enhance : 1; ///< Try to enhance picture data
bool scale_to_fit : 1; ///< Image no larger than the allocation
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double scale; ///< Scaling factor
cairo_surface_t *enhance_swap; ///< Quick swap in/out
FivIoProfile screen_cms_profile; ///< Target colour profile for widget
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int remaining_loops; ///< Greater than zero if limited
gint64 frame_time; ///< Current frame's start, µs precision
gulong frame_update_connection; ///< GdkFrameClock::update
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};
G_DEFINE_TYPE(FivView, fiv_view, GTK_TYPE_WIDGET)
struct size {
double width, height;
};
static FivIoOrientation view_left[9] = {
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[FivIoOrientationUnknown] = FivIoOrientationUnknown,
[FivIoOrientation0] = FivIoOrientation270,
[FivIoOrientationMirror0] = FivIoOrientationMirror270,
[FivIoOrientation180] = FivIoOrientation90,
[FivIoOrientationMirror180] = FivIoOrientationMirror90,
[FivIoOrientationMirror270] = FivIoOrientationMirror180,
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[FivIoOrientation90] = FivIoOrientation0,
[FivIoOrientationMirror90] = FivIoOrientationMirror0,
[FivIoOrientation270] = FivIoOrientation180,
};
static FivIoOrientation view_mirror[9] = {
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[FivIoOrientationUnknown] = FivIoOrientationUnknown,
[FivIoOrientation0] = FivIoOrientationMirror0,
[FivIoOrientationMirror0] = FivIoOrientation0,
[FivIoOrientation180] = FivIoOrientationMirror180,
[FivIoOrientationMirror180] = FivIoOrientation180,
[FivIoOrientationMirror270] = FivIoOrientation270,
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[FivIoOrientation90] = FivIoOrientationMirror270,
[FivIoOrientationMirror90] = FivIoOrientation90,
[FivIoOrientation270] = FivIoOrientationMirror270,
};
static FivIoOrientation view_right[9] = {
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[FivIoOrientationUnknown] = FivIoOrientationUnknown,
[FivIoOrientation0] = FivIoOrientation90,
[FivIoOrientationMirror0] = FivIoOrientationMirror90,
[FivIoOrientation180] = FivIoOrientation270,
[FivIoOrientationMirror180] = FivIoOrientationMirror270,
[FivIoOrientationMirror270] = FivIoOrientationMirror0,
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[FivIoOrientation90] = FivIoOrientation180,
[FivIoOrientationMirror90] = FivIoOrientationMirror180,
[FivIoOrientation270] = FivIoOrientation0,
};
enum {
PROP_SCALE = 1,
PROP_SCALE_TO_FIT,
PROP_ENABLE_CMS,
PROP_FILTER,
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PROP_CHECKERBOARD,
PROP_ENHANCE,
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PROP_PLAYING,
PROP_HAS_IMAGE,
PROP_CAN_ANIMATE,
PROP_HAS_PREVIOUS_PAGE,
PROP_HAS_NEXT_PAGE,
N_PROPERTIES
};
static GParamSpec *view_properties[N_PROPERTIES];
static void
fiv_view_finalize(GObject *gobject)
{
FivView *self = FIV_VIEW(gobject);
g_clear_pointer(&self->screen_cms_profile, fiv_io_profile_free);
g_clear_pointer(&self->enhance_swap, cairo_surface_destroy);
g_clear_pointer(&self->image, cairo_surface_destroy);
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g_free(self->path);
G_OBJECT_CLASS(fiv_view_parent_class)->finalize(gobject);
}
static void
fiv_view_get_property(
GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
{
FivView *self = FIV_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_ENABLE_CMS:
g_value_set_boolean(value, self->enable_cms);
break;
case PROP_FILTER:
g_value_set_boolean(value, self->filter);
break;
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case PROP_CHECKERBOARD:
g_value_set_boolean(value, self->checkerboard);
break;
case PROP_ENHANCE:
g_value_set_boolean(value, self->enhance);
break;
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case PROP_PLAYING:
g_value_set_boolean(value, !!self->frame_update_connection);
break;
case PROP_HAS_IMAGE:
g_value_set_boolean(value, !!self->image);
break;
case PROP_CAN_ANIMATE:
g_value_set_boolean(value, self->page &&
cairo_surface_get_user_data(self->page, &fiv_io_key_frame_next));
break;
case PROP_HAS_PREVIOUS_PAGE:
g_value_set_boolean(value, self->image && self->page != self->image);
break;
case PROP_HAS_NEXT_PAGE:
g_value_set_boolean(value, self->page &&
cairo_surface_get_user_data(self->page, &fiv_io_key_page_next));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
}
}
static void
fiv_view_set_property(
GObject *object, guint property_id, const GValue *value, GParamSpec *pspec)
{
FivView *self = FIV_VIEW(object);
switch (property_id) {
case PROP_SCALE_TO_FIT:
if (self->scale_to_fit != g_value_get_boolean(value))
fiv_view_command(self, FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT);
break;
case PROP_ENABLE_CMS:
if (self->enable_cms != g_value_get_boolean(value))
fiv_view_command(self, FIV_VIEW_COMMAND_TOGGLE_CMS);
break;
case PROP_FILTER:
if (self->filter != g_value_get_boolean(value))
fiv_view_command(self, FIV_VIEW_COMMAND_TOGGLE_FILTER);
break;
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case PROP_CHECKERBOARD:
if (self->checkerboard != g_value_get_boolean(value))
fiv_view_command(self, FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD);
break;
case PROP_ENHANCE:
if (self->enhance != g_value_get_boolean(value))
fiv_view_command(self, FIV_VIEW_COMMAND_TOGGLE_ENHANCE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
}
}
static struct size
get_surface_dimensions(FivView *self)
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{
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if (!self->image)
return (struct size) {};
cairo_rectangle_t extents = {};
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switch (cairo_surface_get_type(self->page)) {
case CAIRO_SURFACE_TYPE_IMAGE:
extents.width = cairo_image_surface_get_width(self->page);
extents.height = cairo_image_surface_get_height(self->page);
break;
case CAIRO_SURFACE_TYPE_RECORDING:
if (!cairo_recording_surface_get_extents(self->page, &extents))
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cairo_recording_surface_ink_extents(self->page,
&extents.x, &extents.y, &extents.width, &extents.height);
break;
default:
g_assert_not_reached();
}
switch (self->orientation) {
case FivIoOrientation90:
case FivIoOrientationMirror90:
case FivIoOrientation270:
case FivIoOrientationMirror270:
return (struct size) {extents.height, extents.width};
default:
return (struct size) {extents.width, extents.height};
}
}
static void
get_display_dimensions(FivView *self, int *width, int *height)
{
struct size surface_dimensions = get_surface_dimensions(self);
*width = ceil(surface_dimensions.width * self->scale);
*height = ceil(surface_dimensions.height * self->scale);
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}
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static cairo_matrix_t
get_orientation_matrix(FivIoOrientation o, double width, double height)
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{
cairo_matrix_t matrix = {};
cairo_matrix_init_identity(&matrix);
switch (o) {
case FivIoOrientation90:
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cairo_matrix_rotate(&matrix, -M_PI_2);
cairo_matrix_translate(&matrix, -width, 0);
break;
case FivIoOrientation180:
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cairo_matrix_scale(&matrix, -1, -1);
cairo_matrix_translate(&matrix, -width, -height);
break;
case FivIoOrientation270:
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cairo_matrix_rotate(&matrix, +M_PI_2);
cairo_matrix_translate(&matrix, 0, -height);
break;
case FivIoOrientationMirror0:
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cairo_matrix_scale(&matrix, -1, +1);
cairo_matrix_translate(&matrix, -width, 0);
break;
case FivIoOrientationMirror90:
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cairo_matrix_rotate(&matrix, +M_PI_2);
cairo_matrix_scale(&matrix, -1, +1);
cairo_matrix_translate(&matrix, -width, -height);
break;
case FivIoOrientationMirror180:
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cairo_matrix_scale(&matrix, +1, -1);
cairo_matrix_translate(&matrix, 0, -height);
break;
case FivIoOrientationMirror270:
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cairo_matrix_rotate(&matrix, -M_PI_2);
cairo_matrix_scale(&matrix, -1, +1);
default:
break;
}
return matrix;
}
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static void
fiv_view_get_preferred_height(GtkWidget *widget, gint *minimum, gint *natural)
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{
FivView *self = FIV_VIEW(widget);
if (self->scale_to_fit) {
*natural = ceil(get_surface_dimensions(self).height);
*minimum = 1;
} else {
int dw, dh;
get_display_dimensions(self, &dw, &dh);
*minimum = *natural = dh;
}
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}
static void
fiv_view_get_preferred_width(GtkWidget *widget, gint *minimum, gint *natural)
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{
FivView *self = FIV_VIEW(widget);
if (self->scale_to_fit) {
*natural = ceil(get_surface_dimensions(self).width);
*minimum = 1;
} else {
int dw, dh;
get_display_dimensions(self, &dw, &dh);
*minimum = *natural = dw;
}
}
static void
fiv_view_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
{
GTK_WIDGET_CLASS(fiv_view_parent_class)->size_allocate(widget, allocation);
FivView *self = FIV_VIEW(widget);
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if (!self->image || !self->scale_to_fit)
return;
struct size surface_dimensions = get_surface_dimensions(self);
self->scale = 1;
if (ceil(surface_dimensions.width * self->scale) > allocation->width)
self->scale = allocation->width / surface_dimensions.width;
if (ceil(surface_dimensions.height * self->scale) > allocation->height)
self->scale = allocation->height / surface_dimensions.height;
g_object_notify_by_pspec(G_OBJECT(widget), view_properties[PROP_SCALE]);
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}
// https://www.freedesktop.org/wiki/OpenIcc/ICC_Profiles_in_X_Specification_0.4
// has disappeared, but you can use the wayback machine.
//
// Note that Wayland does not have any appropriate protocol, as of writing:
// https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/14
static void
reload_screen_cms_profile(FivView *self, GdkWindow *window)
{
g_clear_pointer(&self->screen_cms_profile, fiv_io_profile_free);
GdkDisplay *display = gdk_window_get_display(window);
GdkMonitor *monitor = gdk_display_get_monitor_at_window(display, window);
int num = -1;
for (int i = gdk_display_get_n_monitors(display); num < 0 && i--; )
if (gdk_display_get_monitor(display, i) == monitor)
num = i;
if (num < 0)
goto out;
char atom[32] = "";
g_snprintf(atom, sizeof atom, "_ICC_PROFILE%c%d", num ? '_' : '\0', num);
// Sadly, there is no nice GTK+/GDK mechanism to watch this for changes.
int format = 0, length = 0;
GdkAtom type = GDK_NONE;
guchar *data = NULL;
GdkWindow *root = gdk_screen_get_root_window(gdk_window_get_screen(window));
if (gdk_property_get(root, gdk_atom_intern(atom, FALSE), GDK_NONE, 0,
8 << 20 /* MiB */, FALSE, &type, &format, &length, &data)) {
if (format == 8 && length > 0)
self->screen_cms_profile = fiv_io_profile_new(data, length);
g_free(data);
}
out:
if (!self->screen_cms_profile)
self->screen_cms_profile = fiv_io_profile_new_sRGB();
}
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static void
fiv_view_realize(GtkWidget *widget)
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{
GtkAllocation allocation;
gtk_widget_get_allocation(widget, &allocation);
GdkWindowAttr attributes = {
.window_type = GDK_WINDOW_CHILD,
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.x = allocation.x,
.y = allocation.y,
.width = allocation.width,
.height = allocation.height,
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// Input-only would presumably also work (as in GtkPathBar, e.g.),
// but it merely seems to involve more work.
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.wclass = GDK_INPUT_OUTPUT,
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// Assuming here that we can't ask for a higher-precision Visual
// than what we get automatically.
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.visual = gtk_widget_get_visual(widget),
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.event_mask = gtk_widget_get_events(widget) | GDK_SCROLL_MASK |
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GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK,
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};
// 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",
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// 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
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// 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
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gtk_widget_register_window(widget, window);
gtk_widget_set_window(widget, window);
gtk_widget_set_realized(widget, TRUE);
reload_screen_cms_profile(FIV_VIEW(widget), window);
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}
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static gboolean
fiv_view_draw(GtkWidget *widget, cairo_t *cr)
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{
// 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);
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GtkStyleContext *style = gtk_widget_get_style_context(widget);
gtk_render_background(style, cr, 0, 0, allocation.width, allocation.height);
FivView *self = FIV_VIEW(widget);
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if (!self->image ||
!gtk_cairo_should_draw_window(cr, gtk_widget_get_window(widget)))
return TRUE;
int w, h;
get_display_dimensions(self, &w, &h);
double x = 0;
double y = 0;
if (w < allocation.width)
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x = round((allocation.width - w) / 2.);
if (h < allocation.height)
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y = round((allocation.height - h) / 2.);
struct size surface_dimensions = get_surface_dimensions(self);
cairo_matrix_t matrix = get_orientation_matrix(
self->orientation, surface_dimensions.width, surface_dimensions.height);
cairo_translate(cr, x, y);
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if (self->checkerboard) {
gtk_style_context_save(style);
gtk_style_context_add_class(style, "checkerboard");
gtk_render_background(style, cr, 0, 0, w, h);
gtk_style_context_restore(style);
}
// FIXME: Recording surfaces do not work well with CAIRO_SURFACE_TYPE_XLIB,
// we always get a shitty pixmap, where transparency contains junk.
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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);
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cairo_set_source_surface(tcr, self->frame, 0, 0);
cairo_pattern_set_matrix(cairo_get_source(tcr), &matrix);
cairo_paint(tcr);
cairo_destroy(tcr);
cairo_set_source_surface(cr, image, 0, 0);
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, 0, 0, w, h);
cairo_clip(cr);
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cairo_scale(cr, self->scale, self->scale);
cairo_set_source_surface(cr, self->frame, 0, 0);
cairo_pattern_t *pattern = cairo_get_source(cr);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
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// TODO(p): Prescale it ourselves to an off-screen bitmap, gamma-correctly.
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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
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cairo_paint(cr);
return TRUE;
}
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static gboolean
fiv_view_button_press_event(GtkWidget *widget, GdkEventButton *event)
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{
GTK_WIDGET_CLASS(fiv_view_parent_class)->button_press_event(widget, event);
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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 1.25
static gboolean
set_scale_to_fit(FivView *self, bool scale_to_fit)
{
if (self->scale_to_fit != scale_to_fit) {
self->scale_to_fit = scale_to_fit;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_SCALE_TO_FIT]);
gtk_widget_queue_resize(GTK_WIDGET(self));
}
return TRUE;
}
static gboolean
set_scale(FivView *self, double scale)
{
self->scale = scale;
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_SCALE]);
gtk_widget_queue_resize(GTK_WIDGET(self));
return set_scale_to_fit(self, false);
}
static gboolean
set_scale_to_fit_width(FivView *self)
{
double w = get_surface_dimensions(self).width;
int allocated = gtk_widget_get_allocated_width(
gtk_widget_get_parent(GTK_WIDGET(self)));
if (ceil(w * self->scale) > allocated)
return set_scale(self, allocated / w);
return TRUE;
}
static gboolean
set_scale_to_fit_height(FivView *self)
{
double h = get_surface_dimensions(self).height;
int allocated = gtk_widget_get_allocated_height(
gtk_widget_get_parent(GTK_WIDGET(self)));
if (ceil(h * self->scale) > allocated)
return set_scale(self, allocated / h);
return TRUE;
}
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static gboolean
fiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
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{
FivView *self = FIV_VIEW(widget);
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if (!self->image)
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return FALSE;
if (event->state & gtk_accelerator_get_default_mod_mask())
return FALSE;
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switch (event->direction) {
case GDK_SCROLL_UP:
return set_scale(self, self->scale * SCALE_STEP);
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case GDK_SCROLL_DOWN:
return set_scale(self, self->scale / SCALE_STEP);
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default:
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// For some reason, we can also get GDK_SCROLL_SMOOTH.
// Left/right are good to steal from GtkScrolledWindow for consistency.
return TRUE;
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}
}
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static void
stop_animating(FivView *self)
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{
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;
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g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_PLAYING]);
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}
static gboolean
advance_frame(FivView *self)
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{
cairo_surface_t *next =
cairo_surface_get_user_data(self->frame, &fiv_io_key_frame_next);
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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(FivView *self, GdkFrameClock *clock)
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{
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, &fiv_io_key_frame_duration);
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if (duration < 0)
return FALSE;
// Do not busy loop. GIF timings are given in hundredths of a second.
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// Note that browsers seem to do [< 10] => 100:
// https://bugs.webkit.org/show_bug.cgi?id=36082
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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)
{
FivView *self = FIV_VIEW(user_data);
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if (!advance_animation(self, clock))
stop_animating(self);
}
static void
start_animating(FivView *self)
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{
stop_animating(self);
GdkFrameClock *clock = gtk_widget_get_frame_clock(GTK_WIDGET(self));
if (!clock || !self->image ||
!cairo_surface_get_user_data(self->page, &fiv_io_key_frame_next))
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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, &fiv_io_key_loops);
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gdk_frame_clock_begin_updating(clock);
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g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_PLAYING]);
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}
static void
switch_page(FivView *self, cairo_surface_t *page)
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{
self->frame = self->page = page;
if ((self->orientation = (uintptr_t) cairo_surface_get_user_data(
self->page, &fiv_io_key_orientation)) == FivIoOrientationUnknown)
self->orientation = FivIoOrientation0;
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start_animating(self);
gtk_widget_queue_resize(GTK_WIDGET(self));
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_CAN_ANIMATE]);
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_HAS_PREVIOUS_PAGE]);
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_HAS_NEXT_PAGE]);
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}
static void
fiv_view_map(GtkWidget *widget)
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{
GTK_WIDGET_CLASS(fiv_view_parent_class)->map(widget);
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// Loading before mapping will fail to obtain a GdkFrameClock.
start_animating(FIV_VIEW(widget));
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}
void
fiv_view_unmap(GtkWidget *widget)
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{
stop_animating(FIV_VIEW(widget));
GTK_WIDGET_CLASS(fiv_view_parent_class)->unmap(widget);
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}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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);
}
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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, FivView *self)
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{
// Any DPI will be wrong, unless we import that information from the image.
double scale = 1 / 96.;
struct size surface_dimensions = get_surface_dimensions(self);
double w = surface_dimensions.width * scale;
double h = surface_dimensions.height * scale;
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// 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_dimensions.width, surface_dimensions.height);
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cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
cairo_paint(cr);
}
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static void
print(FivView *self)
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{
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);
}
static gboolean
save_as(FivView *self, gboolean frame)
{
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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");
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gtk_file_filter_set_name(webp_filter, "Lossless WebP (*.webp)");
gtk_file_chooser_add_filter(chooser, webp_filter);
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// Note that GTK+'s save dialog is too stupid to automatically change
// the extension when user changes the filter. Presumably,
// gtk_file_chooser_set_extra_widget() can be used to circumvent this.
gchar *basename = g_filename_display_basename(self->path);
gchar *name =
g_strdup_printf(frame ? "%s.frame.webp" : "%s.webp", basename);
g_free(basename);
gtk_file_chooser_set_current_name(chooser, name);
g_free(name);
#endif // HAVE_LIBWEBP
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gtk_file_chooser_set_do_overwrite_confirmation(chooser, TRUE);
gchar *dirname = g_path_get_dirname(self->path);
gtk_file_chooser_set_current_folder(chooser, dirname);
g_free(dirname);
// 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");
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gtk_file_filter_set_name(exv_filter, "Exiv2 metadata (*.exv)");
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)
fiv_io_save(self->page, frame ? self->frame : NULL, path, &error);
else
#endif // HAVE_LIBWEBP
fiv_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 GtkWidget *
info_start_group(GtkWidget *vbox, const char *group)
{
GtkWidget *label = gtk_label_new(group);
gtk_widget_set_hexpand(label, TRUE);
gtk_widget_set_halign(label, GTK_ALIGN_FILL);
PangoAttrList *attrs = pango_attr_list_new();
pango_attr_list_insert(attrs, pango_attr_weight_new(PANGO_WEIGHT_BOLD));
gtk_label_set_attributes(GTK_LABEL(label), attrs);
pango_attr_list_unref(attrs);
GtkWidget *grid = gtk_grid_new();
GtkWidget *expander = gtk_expander_new(NULL);
gtk_expander_set_label_widget(GTK_EXPANDER(expander), label);
gtk_expander_set_expanded(GTK_EXPANDER(expander), TRUE);
gtk_container_add(GTK_CONTAINER(expander), grid);
gtk_grid_set_column_spacing(GTK_GRID(grid), 10);
gtk_box_pack_start(GTK_BOX(vbox), expander, FALSE, FALSE, 0);
return grid;
}
static GtkWidget *
info_parse(char *tsv)
{
GtkSizeGroup *sg = gtk_size_group_new(GTK_SIZE_GROUP_HORIZONTAL);
GtkWidget *vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 10);
const char *last_group = NULL;
GtkWidget *grid = NULL;
int line = 1, row = 0;
for (char *nl; (nl = strchr(tsv, '\n')); line++, tsv = ++nl) {
*nl = 0;
if (nl > tsv && nl[-1] == '\r')
nl[-1] = 0;
char *group = tsv, *tag = strchr(group, '\t');
if (!tag) {
g_warning("ExifTool parse error on line %d", line);
continue;
}
*tag++ = 0;
for (char *p = group; *p; p++)
if (*p == '_')
*p = ' ';
char *value = strchr(tag, '\t');
if (!value) {
g_warning("ExifTool parse error on line %d", line);
continue;
}
*value++ = 0;
if (!last_group || strcmp(last_group, group)) {
grid = info_start_group(vbox, (last_group = group));
row = 0;
}
GtkWidget *a = gtk_label_new(tag);
gtk_size_group_add_widget(sg, a);
gtk_label_set_selectable(GTK_LABEL(a), TRUE);
gtk_label_set_xalign(GTK_LABEL(a), 0.);
gtk_grid_attach(GTK_GRID(grid), a, 0, row, 1, 1);
GtkWidget *b = gtk_label_new(value);
gtk_label_set_selectable(GTK_LABEL(b), TRUE);
gtk_label_set_xalign(GTK_LABEL(b), 0.);
gtk_label_set_line_wrap(GTK_LABEL(b), TRUE);
gtk_widget_set_hexpand(b, TRUE);
gtk_grid_attach(GTK_GRID(grid), b, 1, row, 1, 1);
row++;
}
g_object_unref(sg);
return vbox;
}
static void
info(FivView *self)
{
// TODO(p): Add a fallback to internal capabilities.
// The simplest is to specify the filename and the resolution.
GtkWindow *window = get_toplevel(GTK_WIDGET(self));
int flags = G_SUBPROCESS_FLAGS_STDOUT_PIPE | G_SUBPROCESS_FLAGS_STDERR_PIPE;
GError *error = NULL;
GSubprocess *subprocess = g_subprocess_new(flags, &error, "exiftool",
"-tab", "-groupNames", "-duplicates", "-extractEmbedded", "--binary",
"-quiet", "--", self->path, NULL);
if (error) {
show_error_dialog(window, error);
return;
}
gchar *out = NULL, *err = NULL;
if (!g_subprocess_communicate_utf8(
subprocess, NULL, NULL, &out, &err, &error)) {
show_error_dialog(window, error);
return;
}
GtkWidget *dialog = gtk_widget_new(GTK_TYPE_DIALOG,
"use-header-bar", TRUE,
"title", "Information",
"transient-for", window,
"destroy-with-parent", TRUE, NULL);
GtkWidget *content_area = gtk_dialog_get_content_area(GTK_DIALOG(dialog));
if (*err) {
GtkWidget *info = gtk_info_bar_new();
GtkInfoBar *info_bar = GTK_INFO_BAR(info);
gtk_info_bar_set_message_type(info_bar, GTK_MESSAGE_WARNING);
GtkWidget *info_area = gtk_info_bar_get_content_area(info_bar);
GtkWidget *label = gtk_label_new(g_strstrip(err));
gtk_container_add(GTK_CONTAINER(info_area), label);
gtk_container_add(GTK_CONTAINER(content_area), info);
}
GtkWidget *scroller = gtk_scrolled_window_new(NULL, NULL);
GtkScrolledWindow *sw = GTK_SCROLLED_WINDOW(scroller);
gtk_scrolled_window_set_max_content_width(sw, 600);
gtk_scrolled_window_set_max_content_height(sw, 800);
gtk_scrolled_window_set_propagate_natural_width(sw, TRUE);
gtk_scrolled_window_set_propagate_natural_height(sw, TRUE);
GtkWidget *info = info_parse(out);
gtk_widget_set_hexpand(info, TRUE);
gtk_widget_set_vexpand(info, TRUE);
gtk_style_context_add_class(
gtk_widget_get_style_context(GTK_WIDGET(info)), "fiv-information");
gtk_container_add(GTK_CONTAINER(scroller), info);
gtk_container_add(GTK_CONTAINER(content_area), scroller);
g_free(out);
g_free(err);
g_object_unref(subprocess);
gtk_widget_show_all(dialog);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static inline gboolean
command(FivView *self, FivViewCommand command)
{
fiv_view_command(self, command);
return TRUE;
}
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static gboolean
fiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
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{
FivView *self = FIV_VIEW(widget);
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if (!self->image)
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return FALSE;
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// 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, FIV_VIEW_COMMAND_ZOOM_1);
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case GDK_KEY_plus:
return command(self, FIV_VIEW_COMMAND_ZOOM_IN);
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case GDK_KEY_minus:
return command(self, FIV_VIEW_COMMAND_ZOOM_OUT);
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case GDK_KEY_p:
return command(self, FIV_VIEW_COMMAND_PRINT);
case GDK_KEY_s:
return command(self, FIV_VIEW_COMMAND_SAVE_PAGE);
case GDK_KEY_S:
return save_as(self, TRUE);
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}
}
if (state == GDK_MOD1_MASK) {
switch (event->keyval) {
case GDK_KEY_Return:
return command(self, FIV_VIEW_COMMAND_INFO);
}
}
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if (state != 0)
return FALSE;
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switch (event->keyval) {
case GDK_KEY_1:
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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, FIV_VIEW_COMMAND_ZOOM_IN);
case GDK_KEY_minus:
return command(self, FIV_VIEW_COMMAND_ZOOM_OUT);
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case GDK_KEY_w:
return set_scale_to_fit_width(self);
case GDK_KEY_h:
return set_scale_to_fit_height(self);
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case GDK_KEY_c:
return command(self, FIV_VIEW_COMMAND_TOGGLE_CMS);
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case GDK_KEY_x: // Inspired by gThumb, which has more such modes.
return command(self, FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT);
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case GDK_KEY_i:
return command(self, FIV_VIEW_COMMAND_TOGGLE_FILTER);
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case GDK_KEY_t:
return command(self, FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD);
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case GDK_KEY_e:
return command(self, FIV_VIEW_COMMAND_TOGGLE_ENHANCE);
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case GDK_KEY_less:
return command(self, FIV_VIEW_COMMAND_ROTATE_LEFT);
case GDK_KEY_equal:
return command(self, FIV_VIEW_COMMAND_MIRROR);
case GDK_KEY_greater:
return command(self, FIV_VIEW_COMMAND_ROTATE_RIGHT);
case GDK_KEY_bracketleft:
return command(self, FIV_VIEW_COMMAND_PAGE_PREVIOUS);
case GDK_KEY_bracketright:
return command(self, FIV_VIEW_COMMAND_PAGE_NEXT);
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case GDK_KEY_braceleft:
return command(self, FIV_VIEW_COMMAND_FRAME_PREVIOUS);
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case GDK_KEY_braceright:
return command(self, FIV_VIEW_COMMAND_FRAME_NEXT);
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case GDK_KEY_space:
return command(self, FIV_VIEW_COMMAND_TOGGLE_PLAYBACK);
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}
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return FALSE;
}
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static void
fiv_view_class_init(FivViewClass *klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
object_class->finalize = fiv_view_finalize;
object_class->get_property = fiv_view_get_property;
object_class->set_property = fiv_view_set_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(
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"scale-to-fit", "Scale to fit", "Scale images down to fit the window",
TRUE, G_PARAM_READWRITE);
view_properties[PROP_ENABLE_CMS] = g_param_spec_boolean(
"enable-cms", "Enable CMS", "Enable color management",
TRUE, G_PARAM_READWRITE);
view_properties[PROP_FILTER] = g_param_spec_boolean(
"filter", "Use filtering", "Scale images smoothly",
TRUE, G_PARAM_READWRITE);
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view_properties[PROP_CHECKERBOARD] = g_param_spec_boolean(
"checkerboard", "Show checkerboard", "Highlight transparent background",
FALSE, G_PARAM_READWRITE);
view_properties[PROP_ENHANCE] = g_param_spec_boolean(
"enhance", "Enhance JPEG", "Enhance low-quality JPEG",
FALSE, G_PARAM_READWRITE);
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view_properties[PROP_PLAYING] = g_param_spec_boolean(
"playing", "Playing animation", "An animation is running",
FALSE, G_PARAM_READABLE);
view_properties[PROP_HAS_IMAGE] = g_param_spec_boolean(
"has-image", "Has an image", "An image is loaded",
FALSE, G_PARAM_READABLE);
view_properties[PROP_CAN_ANIMATE] = g_param_spec_boolean(
"can-animate", "Can animate", "An animation is loaded",
FALSE, G_PARAM_READABLE);
view_properties[PROP_HAS_PREVIOUS_PAGE] = g_param_spec_boolean(
"has-previous-page", "Has a previous page", "Preceding pages exist",
FALSE, G_PARAM_READABLE);
view_properties[PROP_HAS_NEXT_PAGE] = g_param_spec_boolean(
"has-next-page", "Has a next page", "Following pages exist",
FALSE, G_PARAM_READABLE);
g_object_class_install_properties(
object_class, N_PROPERTIES, view_properties);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
widget_class->get_preferred_height = fiv_view_get_preferred_height;
widget_class->get_preferred_width = fiv_view_get_preferred_width;
widget_class->size_allocate = fiv_view_size_allocate;
widget_class->map = fiv_view_map;
widget_class->unmap = fiv_view_unmap;
widget_class->realize = fiv_view_realize;
widget_class->draw = fiv_view_draw;
widget_class->button_press_event = fiv_view_button_press_event;
widget_class->scroll_event = fiv_view_scroll_event;
widget_class->key_press_event = fiv_view_key_press_event;
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// 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, "fiv-view");
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}
static void
fiv_view_init(FivView *self)
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{
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gtk_widget_set_can_focus(GTK_WIDGET(self), TRUE);
self->enable_cms = true;
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self->filter = true;
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self->checkerboard = false;
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self->scale = 1.0;
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}
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// --- Public interface --------------------------------------------------------
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// TODO(p): Progressive picture loading, or at least async/cancellable.
gboolean
fiv_view_open(FivView *self, const gchar *path, GError **error)
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{
cairo_surface_t *surface = fiv_io_open(
path, self->enable_cms ? self->screen_cms_profile : NULL, FALSE, error);
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if (!surface)
return FALSE;
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if (self->image)
cairo_surface_destroy(self->image);
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// This is extremely expensive, and only works sometimes.
g_clear_pointer(&self->enhance_swap, cairo_surface_destroy);
if (self->enhance) {
self->enhance = FALSE;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_ENHANCE]);
}
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self->frame = self->page = NULL;
self->image = surface;
switch_page(self, self->image);
set_scale_to_fit(self, true);
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g_free(self->path);
self->path = g_strdup(path);
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_HAS_IMAGE]);
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return TRUE;
}
static void
page_step(FivView *self, int step)
{
cairo_user_data_key_t *key =
step < 0 ? &fiv_io_key_page_previous : &fiv_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(FivView *self, int step)
{
stop_animating(self);
cairo_user_data_key_t *key =
step < 0 ? &fiv_io_key_frame_previous : &fiv_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));
}
static gboolean
reload(FivView *self)
{
GError *error = NULL;
cairo_surface_t *surface = fiv_io_open(self->path,
self->enable_cms ? self->screen_cms_profile : NULL, self->enhance,
&error);
if (!surface) {
show_error_dialog(get_toplevel(GTK_WIDGET(self)), error);
return FALSE;
}
g_clear_pointer(&self->image, cairo_surface_destroy);
g_clear_pointer(&self->enhance_swap, cairo_surface_destroy);
switch_page(self, (self->image = surface));
return TRUE;
}
static void
swap_enhanced_image(FivView *self)
{
cairo_surface_t *saved = self->image;
self->image = self->page = self->frame = NULL;
if (self->enhance_swap) {
switch_page(self, (self->image = self->enhance_swap));
self->enhance_swap = saved;
} else if (reload(self)) {
self->enhance_swap = saved;
} else {
switch_page(self, (self->image = saved));
}
}
void
fiv_view_command(FivView *self, FivViewCommand command)
{
g_return_if_fail(FIV_IS_VIEW(self));
GtkWidget *widget = GTK_WIDGET(self);
if (!self->image)
return;
switch (command) {
break; case FIV_VIEW_COMMAND_ROTATE_LEFT:
self->orientation = view_left[self->orientation];
gtk_widget_queue_resize(widget);
break; case FIV_VIEW_COMMAND_MIRROR:
self->orientation = view_mirror[self->orientation];
gtk_widget_queue_resize(widget);
break; case FIV_VIEW_COMMAND_ROTATE_RIGHT:
self->orientation = view_right[self->orientation];
gtk_widget_queue_resize(widget);
break; case FIV_VIEW_COMMAND_PAGE_FIRST:
switch_page(self, self->image);
break; case FIV_VIEW_COMMAND_PAGE_PREVIOUS:
page_step(self, -1);
break; case FIV_VIEW_COMMAND_PAGE_NEXT:
page_step(self, +1);
break; case FIV_VIEW_COMMAND_PAGE_LAST:
for (cairo_surface_t *s = self->page;
(s = cairo_surface_get_user_data(s, &fiv_io_key_page_next)); )
self->page = s;
switch_page(self, self->page);
break; case FIV_VIEW_COMMAND_FRAME_FIRST:
frame_step(self, 0);
break; case FIV_VIEW_COMMAND_FRAME_PREVIOUS:
frame_step(self, -1);
break; case FIV_VIEW_COMMAND_FRAME_NEXT:
frame_step(self, +1);
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break; case FIV_VIEW_COMMAND_TOGGLE_PLAYBACK:
self->frame_update_connection
? stop_animating(self)
: start_animating(self);
break; case FIV_VIEW_COMMAND_TOGGLE_CMS:
self->enable_cms = !self->enable_cms;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_ENABLE_CMS]);
reload(self);
break; case FIV_VIEW_COMMAND_TOGGLE_FILTER:
self->filter = !self->filter;
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g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_FILTER]);
gtk_widget_queue_draw(widget);
break; case FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD:
self->checkerboard = !self->checkerboard;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_CHECKERBOARD]);
gtk_widget_queue_draw(widget);
break; case FIV_VIEW_COMMAND_TOGGLE_ENHANCE:
self->enhance = !self->enhance;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_ENHANCE]);
swap_enhanced_image(self);
break; case FIV_VIEW_COMMAND_PRINT:
print(self);
break; case FIV_VIEW_COMMAND_SAVE_PAGE:
save_as(self, FALSE);
break; case FIV_VIEW_COMMAND_INFO:
info(self);
break; case FIV_VIEW_COMMAND_ZOOM_IN:
set_scale(self, self->scale * SCALE_STEP);
break; case FIV_VIEW_COMMAND_ZOOM_OUT:
set_scale(self, self->scale / SCALE_STEP);
break; case FIV_VIEW_COMMAND_ZOOM_1:
set_scale(self, 1.0);
break; case FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT:
set_scale_to_fit(self, !self->scale_to_fit);
}
}