fiv/fiv-view.c

1610 lines
51 KiB
C

//
// fiv-view.c: image viewing widget
//
// Copyright (c) 2021 - 2022, 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 "fiv-context-menu.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
#ifdef GDK_WINDOWING_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <gdk/gdkwin32.h>
#endif // GDK_WINDOWING_WIN32
GType
fiv_view_command_get_type(void)
{
static gsize guard;
if (g_once_init_enter(&guard)) {
#define XX(constant, name) {constant, #constant, name},
static const GEnumValue values[] = {FIV_VIEW_COMMANDS(XX) {}};
#undef XX
GType type = g_enum_register_static(
g_intern_static_string("FivViewCommand"), values);
g_once_init_leave(&guard, type);
}
return guard;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct _FivView {
GtkWidget parent_instance;
GtkAdjustment *hadjustment; ///< GtkScrollable boilerplate
GtkAdjustment *vadjustment; ///< GtkScrollable boilerplate
GtkScrollablePolicy hscroll_policy; ///< GtkScrollable boilerplate
GtkScrollablePolicy vscroll_policy; ///< GtkScrollable boilerplate
gchar *messages; ///< Image load information
gchar *uri; ///< Path to the current image (if any)
FivIoImage *image; ///< The loaded image (sequence)
FivIoImage *page; ///< Current page within image, weak
FivIoImage *page_scaled; ///< Current page within image, scaled
FivIoImage *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
bool fixate : 1; ///< Keep zoom and position
double scale; ///< Scaling factor
double drag_start[2]; ///< Adjustment values for drag origin
FivIoImage *enhance_swap; ///< Quick swap in/out
FivIoProfile screen_cms_profile; ///< Target colour profile for widget
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_EXTENDED(FivView, fiv_view, GTK_TYPE_WIDGET, 0,
G_IMPLEMENT_INTERFACE(GTK_TYPE_SCROLLABLE, NULL))
typedef struct _Dimensions {
double width, height;
} Dimensions;
static FivIoOrientation view_left[9] = {
[FivIoOrientationUnknown] = FivIoOrientationUnknown,
[FivIoOrientation0] = FivIoOrientation270,
[FivIoOrientationMirror0] = FivIoOrientationMirror270,
[FivIoOrientation180] = FivIoOrientation90,
[FivIoOrientationMirror180] = FivIoOrientationMirror90,
[FivIoOrientationMirror270] = FivIoOrientationMirror180,
[FivIoOrientation90] = FivIoOrientation0,
[FivIoOrientationMirror90] = FivIoOrientationMirror0,
[FivIoOrientation270] = FivIoOrientation180,
};
static FivIoOrientation view_mirror[9] = {
[FivIoOrientationUnknown] = FivIoOrientationUnknown,
[FivIoOrientation0] = FivIoOrientationMirror0,
[FivIoOrientationMirror0] = FivIoOrientation0,
[FivIoOrientation180] = FivIoOrientationMirror180,
[FivIoOrientationMirror180] = FivIoOrientation180,
[FivIoOrientationMirror270] = FivIoOrientation90,
[FivIoOrientation90] = FivIoOrientationMirror270,
[FivIoOrientationMirror90] = FivIoOrientation270,
[FivIoOrientation270] = FivIoOrientationMirror90,
};
static FivIoOrientation view_right[9] = {
[FivIoOrientationUnknown] = FivIoOrientationUnknown,
[FivIoOrientation0] = FivIoOrientation90,
[FivIoOrientationMirror0] = FivIoOrientationMirror90,
[FivIoOrientation180] = FivIoOrientation270,
[FivIoOrientationMirror180] = FivIoOrientationMirror270,
[FivIoOrientationMirror270] = FivIoOrientationMirror0,
[FivIoOrientation90] = FivIoOrientation180,
[FivIoOrientationMirror90] = FivIoOrientationMirror180,
[FivIoOrientation270] = FivIoOrientation0,
};
enum {
PROP_MESSAGES = 1,
PROP_SCALE,
PROP_SCALE_TO_FIT,
PROP_FIXATE,
PROP_ENABLE_CMS,
PROP_FILTER,
PROP_CHECKERBOARD,
PROP_ENHANCE,
PROP_PLAYING,
PROP_HAS_IMAGE,
PROP_CAN_ANIMATE,
PROP_HAS_PREVIOUS_PAGE,
PROP_HAS_NEXT_PAGE,
N_PROPERTIES,
// These are overriden, we do not register them.
PROP_HADJUSTMENT,
PROP_VADJUSTMENT,
PROP_HSCROLL_POLICY,
PROP_VSCROLL_POLICY,
};
static GParamSpec *view_properties[N_PROPERTIES];
enum {
COMMAND,
LAST_SIGNAL
};
// Globals are, sadly, the canonical way of storing signal numbers.
static guint view_signals[LAST_SIGNAL];
static void
on_adjustment_value_changed(
G_GNUC_UNUSED GtkAdjustment *adjustment, gpointer user_data)
{
gtk_widget_queue_draw(GTK_WIDGET(user_data));
}
static Dimensions
get_surface_dimensions(FivView *self)
{
if (!self->image)
return (Dimensions) {};
Dimensions dimensions = {};
fiv_io_orientation_dimensions(
self->page, self->orientation, &dimensions.width, &dimensions.height);
return dimensions;
}
static void
get_display_dimensions(FivView *self, int *width, int *height)
{
Dimensions surface_dimensions = get_surface_dimensions(self);
*width = ceil(surface_dimensions.width * self->scale);
*height = ceil(surface_dimensions.height * self->scale);
}
static void
update_adjustments(FivView *self)
{
int dw = 0, dh = 0;
get_display_dimensions(self, &dw, &dh);
GtkAllocation alloc;
gtk_widget_get_allocation(GTK_WIDGET(self), &alloc);
if (self->hadjustment) {
gtk_adjustment_configure(self->hadjustment,
gtk_adjustment_get_value(self->hadjustment), 0, dw,
alloc.width * 0.1, alloc.width * 0.9, alloc.width);
}
if (self->vadjustment) {
gtk_adjustment_configure(self->vadjustment,
gtk_adjustment_get_value(self->vadjustment), 0, dh,
alloc.height * 0.1, alloc.height * 0.9, alloc.height);
}
}
static gboolean
replace_adjustment(
FivView *self, GtkAdjustment **adjustment, GtkAdjustment *replacement)
{
if (*adjustment == replacement)
return FALSE;
if (*adjustment) {
g_signal_handlers_disconnect_by_func(
*adjustment, on_adjustment_value_changed, self);
g_clear_object(adjustment);
}
if (replacement) {
*adjustment = g_object_ref(replacement);
g_signal_connect(*adjustment, "value-changed",
G_CALLBACK(on_adjustment_value_changed), self);
update_adjustments(self);
}
return TRUE;
}
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, fiv_io_image_unref);
g_clear_pointer(&self->image, fiv_io_image_unref);
g_clear_pointer(&self->page_scaled, fiv_io_image_unref);
g_free(self->uri);
g_free(self->messages);
replace_adjustment(self, &self->hadjustment, NULL);
replace_adjustment(self, &self->vadjustment, NULL);
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_MESSAGES:
g_value_set_string(value, self->messages);
break;
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_FIXATE:
g_value_set_boolean(value, self->fixate);
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;
case PROP_CHECKERBOARD:
g_value_set_boolean(value, self->checkerboard);
break;
case PROP_ENHANCE:
g_value_set_boolean(value, self->enhance);
break;
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 && self->page->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 && self->page->page_next);
break;
case PROP_HADJUSTMENT:
g_value_set_object(value, self->hadjustment);
break;
case PROP_VADJUSTMENT:
g_value_set_object(value, self->vadjustment);
break;
case PROP_HSCROLL_POLICY:
g_value_set_enum(value, self->hscroll_policy);
break;
case PROP_VSCROLL_POLICY:
g_value_set_enum(value, self->vscroll_policy);
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_FIXATE:
if (self->fixate != g_value_get_boolean(value))
fiv_view_command(self, FIV_VIEW_COMMAND_TOGGLE_FIXATE);
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;
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;
case PROP_HADJUSTMENT:
if (replace_adjustment(
self, &self->hadjustment, g_value_get_object(value)))
g_object_notify_by_pspec(object, pspec);
break;
case PROP_VADJUSTMENT:
if (replace_adjustment(
self, &self->vadjustment, g_value_get_object(value)))
g_object_notify_by_pspec(object, pspec);
break;
case PROP_HSCROLL_POLICY:
if ((gint) self->hscroll_policy != g_value_get_enum(value)) {
self->hscroll_policy = g_value_get_enum(value);
gtk_widget_queue_resize(GTK_WIDGET(self));
g_object_notify_by_pspec(object, pspec);
}
break;
case PROP_VSCROLL_POLICY:
if ((gint) self->vscroll_policy != g_value_get_enum(value)) {
self->vscroll_policy = g_value_get_enum(value);
gtk_widget_queue_resize(GTK_WIDGET(self));
g_object_notify_by_pspec(object, pspec);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
}
}
static void
fiv_view_get_preferred_height(GtkWidget *widget, gint *minimum, gint *natural)
{
FivView *self = FIV_VIEW(widget);
if (self->scale_to_fit) {
*minimum = 1;
*natural = MAX(*minimum, ceil(get_surface_dimensions(self).height));
} else {
int dw, dh;
get_display_dimensions(self, &dw, &dh);
*minimum = *natural = dh;
}
}
static void
fiv_view_get_preferred_width(GtkWidget *widget, gint *minimum, gint *natural)
{
FivView *self = FIV_VIEW(widget);
if (self->scale_to_fit) {
*minimum = 1;
*natural = MAX(*minimum, ceil(get_surface_dimensions(self).width));
} else {
int dw, dh;
get_display_dimensions(self, &dw, &dh);
*minimum = *natural = dw;
}
}
static void
prescale_page(FivView *self)
{
FivIoRenderClosure *closure = NULL;
if (!self->image || !(closure = self->page->render))
return;
// TODO(p): Restart the animation. No vector formats currently animate.
g_return_if_fail(!self->frame_update_connection);
// If it fails, the previous frame pointer may become invalid.
g_clear_pointer(&self->page_scaled, fiv_io_image_unref);
self->frame = self->page_scaled = closure->render(closure, self->scale);
if (!self->page_scaled)
self->frame = self->page;
}
static void
set_source_image(FivView *self, cairo_t *cr)
{
cairo_surface_t *surface = fiv_io_image_to_surface_noref(self->frame);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_surface_destroy(surface);
}
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);
if (!self->image || !self->scale_to_fit)
goto out;
Dimensions surface_dimensions = get_surface_dimensions(self);
double scale = 1;
if (ceil(surface_dimensions.width * scale) > allocation->width)
scale = allocation->width / surface_dimensions.width;
if (ceil(surface_dimensions.height * scale) > allocation->height)
scale = allocation->height / surface_dimensions.height;
if (self->scale != scale) {
self->scale = scale;
g_object_notify_by_pspec(G_OBJECT(widget), view_properties[PROP_SCALE]);
prescale_page(self);
}
out:
update_adjustments(self);
}
// 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);
#ifdef GDK_WINDOWING_WIN32
if (GDK_IS_WIN32_WINDOW(window)) {
HWND hwnd = GDK_WINDOW_HWND(window);
HDC hdc = GetDC(hwnd);
if (hdc) {
DWORD len = 0;
(void) GetICMProfile(hdc, &len, NULL);
gchar *path = g_new(gchar, len);
if (GetICMProfile(hdc, &len, path)) {
gchar *data = NULL;
gsize length = 0;
if (g_file_get_contents(path, &data, &length, NULL))
self->screen_cms_profile = fiv_io_profile_new(data, length);
g_free(data);
}
g_free(path);
ReleaseDC(hwnd, hdc);
}
goto out;
}
#endif // GDK_WINDOWING_WIN32
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();
}
static void
fiv_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),
// Pointer motion/release enables GtkGestureDrag.
.event_mask = gtk_widget_get_events(widget) | GDK_KEY_PRESS_MASK |
GDK_SCROLL_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
GDK_POINTER_MOTION_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
// Note that this disables double buffering, and sometimes causes artefacts,
// 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.
GSettings *settings = g_settings_new(PROJECT_NS PROJECT_NAME);
if (GDK_IS_X11_WINDOW(window) &&
g_settings_get_boolean(settings, "native-view-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);
reload_screen_cms_profile(FIV_VIEW(widget), window);
}
static gboolean
fiv_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);
GtkStyleContext *style = gtk_widget_get_style_context(widget);
gtk_render_background(style, cr, 0, 0, allocation.width, allocation.height);
FivView *self = FIV_VIEW(widget);
if (!self->image ||
!gtk_cairo_should_draw_window(cr, gtk_widget_get_window(widget)))
return TRUE;
int dw, dh;
get_display_dimensions(self, &dw, &dh);
double x = 0;
double y = 0;
if (self->hadjustment)
x = -floor(gtk_adjustment_get_value(self->hadjustment));
if (self->vadjustment)
y = -floor(gtk_adjustment_get_value(self->vadjustment));
if (dw < allocation.width)
x = round((allocation.width - dw) / 2.);
if (dh < allocation.height)
y = round((allocation.height - dh) / 2.);
// XXX: This naming is confusing, because it isn't actually for the surface,
// but rather for our possibly rotated rendition of it.
Dimensions surface_dimensions = {};
cairo_matrix_t matrix = fiv_io_orientation_apply(
self->page_scaled ? self->page_scaled : self->page, self->orientation,
&surface_dimensions.width, &surface_dimensions.height);
cairo_translate(cr, x, y);
if (self->checkerboard) {
gtk_style_context_save(style);
gtk_style_context_add_class(style, "checkerboard");
gtk_render_background(style, cr, 0, 0, dw, dh);
gtk_style_context_restore(style);
}
// Then all frames are pre-scaled.
if (self->page_scaled) {
set_source_image(self, cr);
cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
cairo_paint(cr);
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, dw, dh);
cairo_clip(cr);
cairo_scale(cr, self->scale, self->scale);
set_source_image(self, cr);
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
fiv_view_button_press_event(GtkWidget *widget, GdkEventButton *event)
{
if (GTK_WIDGET_CLASS(fiv_view_parent_class)
->button_press_event(widget, event))
return GDK_EVENT_STOP;
if (event->button == GDK_BUTTON_PRIMARY &&
gtk_widget_get_focus_on_click(widget))
gtk_widget_grab_focus(widget);
return GDK_EVENT_PROPAGATE;
}
#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) {
if ((self->scale_to_fit = scale_to_fit)) {
self->fixate = false;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_FIXATE]);
}
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_SCALE_TO_FIT]);
gtk_widget_queue_resize(GTK_WIDGET(self));
}
return TRUE;
}
static void
widget_to_surface(FivView *self, double *x, double *y)
{
int dw, dh;
get_display_dimensions(self, &dw, &dh);
GtkAllocation allocation;
gtk_widget_get_allocation(GTK_WIDGET(self), &allocation);
// Unneeded, thus unimplemented: this means zero adjustment values.
if (!self->hadjustment || !self->vadjustment)
return;
*x = (*x + (dw < allocation.width
? -round((allocation.width - dw) / 2.)
: +floor(gtk_adjustment_get_value(self->hadjustment))))
/ self->scale;
*y = (*y + (dh < allocation.height
? -round((allocation.height - dh) / 2.)
: +floor(gtk_adjustment_get_value(self->vadjustment))))
/ self->scale;
}
static gboolean
set_scale(FivView *self, double scale, const GdkEvent *event)
{
// FIXME: Zooming to exactly 1:1 breaks rendering with some images
// when using a native X11 Window. This is a silly workaround.
GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(self));
if (window && gdk_window_has_native(window) && scale == 1)
scale = 0.999999999999999;
if (self->scale == scale)
goto out;
GtkAllocation allocation;
gtk_widget_get_allocation(GTK_WIDGET(self), &allocation);
double focus_x = 0, focus_y = 0;
if (!event || !gdk_event_get_coords(event, &focus_x, &focus_y)) {
focus_x = 0.5 * allocation.width;
focus_y = 0.5 * allocation.height;
}
double surface_x = focus_x;
double surface_y = focus_y;
widget_to_surface(self, &surface_x, &surface_y);
self->scale = scale;
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_SCALE]);
prescale_page(self);
// Similar to set_orientation().
if (self->hadjustment && self->vadjustment) {
Dimensions surface_dimensions = get_surface_dimensions(self);
update_adjustments(self);
if (surface_dimensions.width * self->scale > allocation.width)
gtk_adjustment_set_value(
self->hadjustment, surface_x * self->scale - focus_x);
if (surface_dimensions.height * self->scale > allocation.height)
gtk_adjustment_set_value(
self->vadjustment, surface_y * self->scale - focus_y);
}
gtk_widget_queue_resize(GTK_WIDGET(self));
out:
return set_scale_to_fit(self, false);
}
static void
set_scale_to_fit_width(FivView *self)
{
double w = get_surface_dimensions(self).width;
int allocated = gtk_widget_get_allocated_width(GTK_WIDGET(self));
if (ceil(w * self->scale) > allocated)
set_scale(self, allocated / w, NULL);
}
static void
set_scale_to_fit_height(FivView *self)
{
double h = get_surface_dimensions(self).height;
int allocated = gtk_widget_get_allocated_height(GTK_WIDGET(self));
if (ceil(h * self->scale) > allocated)
set_scale(self, allocated / h, NULL);
}
static gboolean
fiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
{
FivView *self = FIV_VIEW(widget);
if (!self->image)
return GDK_EVENT_PROPAGATE;
if (event->state & gtk_accelerator_get_default_mod_mask())
return GDK_EVENT_PROPAGATE;
switch (event->direction) {
case GDK_SCROLL_UP:
return set_scale(self, self->scale * SCALE_STEP, (GdkEvent *) event);
case GDK_SCROLL_DOWN:
return set_scale(self, self->scale / SCALE_STEP, (GdkEvent *) event);
default:
// For some reason, native GdkWindows may also get GDK_SCROLL_SMOOTH.
// Left/right are good to steal from GtkScrolledWindow for consistency.
return GDK_EVENT_STOP;
}
}
static void
stop_animating(FivView *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;
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_PLAYING]);
}
static gboolean
advance_frame(FivView *self)
{
FivIoImage *next = self->frame->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(FivView *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.
int64_t duration = self->frame->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)
{
FivView *self = FIV_VIEW(user_data);
if (!advance_animation(self, clock))
stop_animating(self);
}
static void
start_animating(FivView *self)
{
stop_animating(self);
GdkFrameClock *clock = gtk_widget_get_frame_clock(GTK_WIDGET(self));
if (!clock || !self->image || !self->page->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);
// Only restart looping the animation if it has stopped at the end.
if (!self->remaining_loops) {
self->remaining_loops = self->page->loops;
if (self->remaining_loops && !self->frame->frame_next) {
self->frame = self->page;
gtk_widget_queue_draw(GTK_WIDGET(self));
}
}
gdk_frame_clock_begin_updating(clock);
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_PLAYING]);
}
static void
switch_page(FivView *self, FivIoImage *page)
{
g_clear_pointer(&self->page_scaled, fiv_io_image_unref);
self->frame = self->page = page;
prescale_page(self);
if (!self->page ||
(self->orientation = self->page->orientation) ==
FivIoOrientationUnknown)
self->orientation = FivIoOrientation0;
self->remaining_loops = 0;
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]);
}
static void
fiv_view_map(GtkWidget *widget)
{
GTK_WIDGET_CLASS(fiv_view_parent_class)->map(widget);
// Loading before mapping will fail to obtain a GdkFrameClock.
start_animating(FIV_VIEW(widget));
}
void
fiv_view_unmap(GtkWidget *widget)
{
stop_animating(FIV_VIEW(widget));
GTK_WIDGET_CLASS(fiv_view_parent_class)->unmap(widget);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
on_drag_begin(GtkGestureDrag *drag, G_GNUC_UNUSED gdouble start_x,
G_GNUC_UNUSED gdouble start_y, gpointer user_data)
{
GtkGesture *gesture = GTK_GESTURE(drag);
switch (
gtk_gesture_single_get_current_button(GTK_GESTURE_SINGLE(gesture))) {
case GDK_BUTTON_PRIMARY:
case GDK_BUTTON_MIDDLE:
break;
default:
gtk_gesture_set_state(gesture, GTK_EVENT_SEQUENCE_DENIED);
return;
}
GdkModifierType state = 0;
GdkEventSequence *sequence = gtk_gesture_get_last_updated_sequence(gesture);
gdk_event_get_state(gtk_gesture_get_last_event(gesture, sequence), &state);
if (state & gtk_accelerator_get_default_mod_mask()) {
gtk_gesture_set_state(gesture, GTK_EVENT_SEQUENCE_DENIED);
return;
}
// Since we set this up as a pointer-only gesture, there is only the NULL
// sequence, so gtk_gesture_set_sequence_state() is completely unneeded.
gtk_gesture_set_state(gesture, GTK_EVENT_SEQUENCE_CLAIMED);
GdkWindow *window = gtk_widget_get_window(
gtk_event_controller_get_widget(GTK_EVENT_CONTROLLER(drag)));
GdkCursor *cursor =
gdk_cursor_new_from_name(gdk_window_get_display(window), "grabbing");
gdk_window_set_cursor(window, cursor);
g_object_unref(cursor);
FivView *self = FIV_VIEW(user_data);
self->drag_start[0] = self->hadjustment ?
gtk_adjustment_get_value(self->hadjustment) : 0;
self->drag_start[1] = self->vadjustment ?
gtk_adjustment_get_value(self->vadjustment) : 0;
}
static void
on_drag_update(G_GNUC_UNUSED GtkGestureDrag *drag, gdouble offset_x,
gdouble offset_y, gpointer user_data)
{
FivView *self = FIV_VIEW(user_data);
if (self->hadjustment) {
gtk_adjustment_set_value(
self->hadjustment, self->drag_start[0] - offset_x);
}
if (self->vadjustment) {
gtk_adjustment_set_value(
self->vadjustment, self->drag_start[1] - offset_y);
}
}
static void
on_drag_end(GtkGestureDrag *drag, G_GNUC_UNUSED gdouble start_x,
G_GNUC_UNUSED gdouble start_y, G_GNUC_UNUSED gpointer user_data)
{
GdkWindow *window = gtk_widget_get_window(
gtk_event_controller_get_widget(GTK_EVENT_CONTROLLER(drag)));
gdk_window_set_cursor(window, NULL);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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
copy(FivView *self)
{
double fractional_width = 0, fractional_height = 0;
cairo_matrix_t matrix = fiv_io_orientation_apply(
self->frame, self->orientation, &fractional_width, &fractional_height);
int w = ceil(fractional_width), h = ceil(fractional_height);
// XXX: SVG is rendered pre-scaled.
cairo_surface_t *transformed =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
cairo_t *cr = cairo_create(transformed);
set_source_image(self, cr);
cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
cairo_paint(cr);
cairo_destroy(cr);
// TODO(p): Use 16-bit PNGs for >8-bit Cairo surfaces: PNG-encode them
// ourselves and fall back to gtk_selection_data_set_pixbuf().
GdkPixbuf *pixbuf = gdk_pixbuf_get_from_surface(transformed, 0, 0, w, h);
cairo_surface_destroy(transformed);
gtk_clipboard_set_image(
gtk_clipboard_get_for_display(
gtk_widget_get_display(GTK_WIDGET(self)), GDK_SELECTION_CLIPBOARD),
pixbuf);
g_object_unref(pixbuf);
}
static void
on_draw_page(G_GNUC_UNUSED GtkPrintOperation *operation,
GtkPrintContext *context, G_GNUC_UNUSED int page_nr, FivView *self)
{
// Any DPI will be wrong, unless we import that information from the image.
double scale = 1 / 96.;
Dimensions surface_dimensions = {};
// XXX: Perhaps use self->frame, even though their sizes should match.
cairo_matrix_t matrix =
fiv_io_orientation_apply(self->page, self->orientation,
&surface_dimensions.width, &surface_dimensions.height);
double w = surface_dimensions.width * scale;
double h = surface_dimensions.height * 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);
set_source_image(self, cr);
cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
cairo_paint(cr);
}
static void
print(FivView *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);
}
static gboolean
save_as(FivView *self, FivIoImage *frame)
{
GtkWindow *window = get_toplevel(GTK_WIDGET(self));
FivIoProfile target = NULL;
if (self->enable_cms && (target = self->screen_cms_profile)) {
GtkWidget *dialog = gtk_message_dialog_new(window, GTK_DIALOG_MODAL,
GTK_MESSAGE_WARNING, GTK_BUTTONS_CLOSE, "%s",
"Color management overrides attached color profiles.");
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);
}
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);
gtk_file_chooser_set_do_overwrite_confirmation(chooser, TRUE);
GFile *file = g_file_new_for_uri(self->uri);
GFileInfo *info =
g_file_query_info(file, G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
// 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.
const char *basename = info ? g_file_info_get_display_name(info) : "image";
gchar *name = g_strconcat(basename, frame ? "-frame.webp" : ".webp", NULL);
gtk_file_chooser_set_current_name(chooser, name);
g_free(name);
if (g_file_peek_path(file)) {
GFile *parent = g_file_get_parent(file);
(void) gtk_file_chooser_set_current_folder_file(chooser, parent, NULL);
g_object_unref(parent);
}
g_object_unref(file);
g_clear_object(&info);
// 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 (*.webp)");
gtk_file_chooser_add_filter(chooser, webp_filter);
// 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 (*.exv)");
gtk_file_chooser_add_filter(chooser, exv_filter);
GError *error = NULL;
switch (gtk_dialog_run(GTK_DIALOG(dialog))) {
gchar *path;
case GTK_RESPONSE_ACCEPT:
path = gtk_file_chooser_get_filename(chooser);
if (!(gtk_file_chooser_get_filter(chooser) == webp_filter
? fiv_io_save(self->page, frame, target, path, &error)
: fiv_io_save_metadata(self->page, path, &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 void
info(FivView *self)
{
fiv_context_menu_information(get_toplevel(GTK_WIDGET(self)), self->uri);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static gboolean
fiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
{
FivView *self = FIV_VIEW(widget);
// So far, our commands cannot accept arguments, so these few are hardcoded.
if (self->image &&
!(event->state & gtk_accelerator_get_default_mod_mask()) &&
event->keyval >= GDK_KEY_1 && event->keyval <= GDK_KEY_9)
return set_scale(self, event->keyval - GDK_KEY_0, NULL);
return GTK_WIDGET_CLASS(fiv_view_parent_class)
->key_press_event(widget, event);
}
static void
bind(GtkBindingSet *bs, guint keyval, GdkModifierType modifiers,
FivViewCommand command)
{
gtk_binding_entry_add_signal(
bs, keyval, modifiers, "command", 1, FIV_TYPE_VIEW_COMMAND, command);
}
static void
fiv_view_class_init(FivViewClass *klass)
{
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_MESSAGES] = g_param_spec_string(
"messages", "Messages", "Informative messages from the last image load",
NULL, G_PARAM_READABLE);
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_READWRITE);
view_properties[PROP_FIXATE] = g_param_spec_boolean(
"fixate", "Fixate", "Keep zoom and position",
FALSE, 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);
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);
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);
g_object_class_override_property(
object_class, PROP_HADJUSTMENT, "hadjustment");
g_object_class_override_property(
object_class, PROP_VADJUSTMENT, "vadjustment");
g_object_class_override_property(
object_class, PROP_HSCROLL_POLICY, "hscroll-policy");
g_object_class_override_property(
object_class, PROP_VSCROLL_POLICY, "vscroll-policy");
view_signals[COMMAND] =
g_signal_new_class_handler("command", G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK(fiv_view_command),
NULL, NULL, NULL, G_TYPE_NONE, 1, FIV_TYPE_VIEW_COMMAND);
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;
// _gtk_get_primary_accel_mod() is private.
GdkModifierType primary = GDK_CONTROL_MASK;
gtk_accelerator_parse_with_keycode("<Primary>", NULL, NULL, &primary);
GtkBindingSet *bs = gtk_binding_set_by_class(klass);
// First, the standard, intuitive bindings.
bind(bs, GDK_KEY_0, primary, FIV_VIEW_COMMAND_ZOOM_1);
bind(bs, GDK_KEY_plus, primary, FIV_VIEW_COMMAND_ZOOM_IN);
bind(bs, GDK_KEY_minus, primary, FIV_VIEW_COMMAND_ZOOM_OUT);
bind(bs, GDK_KEY_c, primary, FIV_VIEW_COMMAND_COPY);
bind(bs, GDK_KEY_p, primary, FIV_VIEW_COMMAND_PRINT);
bind(bs, GDK_KEY_r, primary, FIV_VIEW_COMMAND_RELOAD);
bind(bs, GDK_KEY_s, primary, FIV_VIEW_COMMAND_SAVE_PAGE);
bind(bs, GDK_KEY_s, GDK_MOD1_MASK, FIV_VIEW_COMMAND_SAVE_FRAME);
bind(bs, GDK_KEY_Return, GDK_MOD1_MASK, FIV_VIEW_COMMAND_INFO);
// The scale-to-fit binding is from gThumb, which has more such modes.
bind(bs, GDK_KEY_F5, 0, FIV_VIEW_COMMAND_RELOAD);
bind(bs, GDK_KEY_r, 0, FIV_VIEW_COMMAND_RELOAD);
bind(bs, GDK_KEY_plus, 0, FIV_VIEW_COMMAND_ZOOM_IN);
bind(bs, GDK_KEY_minus, 0, FIV_VIEW_COMMAND_ZOOM_OUT);
bind(bs, GDK_KEY_w, 0, FIV_VIEW_COMMAND_FIT_WIDTH);
bind(bs, GDK_KEY_h, 0, FIV_VIEW_COMMAND_FIT_HEIGHT);
bind(bs, GDK_KEY_k, 0, FIV_VIEW_COMMAND_TOGGLE_FIXATE);
bind(bs, GDK_KEY_x, 0, FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT);
bind(bs, GDK_KEY_c, 0, FIV_VIEW_COMMAND_TOGGLE_CMS);
bind(bs, GDK_KEY_i, 0, FIV_VIEW_COMMAND_TOGGLE_FILTER);
bind(bs, GDK_KEY_t, 0, FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD);
bind(bs, GDK_KEY_e, 0, FIV_VIEW_COMMAND_TOGGLE_ENHANCE);
bind(bs, GDK_KEY_less, 0, FIV_VIEW_COMMAND_ROTATE_LEFT);
bind(bs, GDK_KEY_equal, 0, FIV_VIEW_COMMAND_MIRROR);
bind(bs, GDK_KEY_greater, 0, FIV_VIEW_COMMAND_ROTATE_RIGHT);
bind(bs, GDK_KEY_bracketleft, 0, FIV_VIEW_COMMAND_PAGE_PREVIOUS);
bind(bs, GDK_KEY_bracketright, 0, FIV_VIEW_COMMAND_PAGE_NEXT);
bind(bs, GDK_KEY_braceleft, 0, FIV_VIEW_COMMAND_FRAME_PREVIOUS);
bind(bs, GDK_KEY_braceright, 0, FIV_VIEW_COMMAND_FRAME_NEXT);
bind(bs, GDK_KEY_space, 0, FIV_VIEW_COMMAND_TOGGLE_PLAYBACK);
// 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");
}
static void
fiv_view_init(FivView *self)
{
gtk_widget_set_can_focus(GTK_WIDGET(self), TRUE);
self->enable_cms = true;
self->filter = true;
self->checkerboard = false;
self->scale = 1.0;
GtkGesture *drag = gtk_gesture_drag_new(GTK_WIDGET(self));
gtk_event_controller_set_propagation_phase(
GTK_EVENT_CONTROLLER(drag), GTK_PHASE_BUBBLE);
g_object_set_data_full(
G_OBJECT(self), "fiv-view-drag-gesture", drag, g_object_unref);
// GtkScrolledWindow's internal GtkGestureDrag is set to only look for
// touch events (and its "event_controllers" are perfectly private,
// so we can't change this), hopefully this is mutually exclusive with that.
// Though note that the GdkWindow doesn't register for touch events now.
gtk_gesture_single_set_exclusive(GTK_GESTURE_SINGLE(drag), TRUE);
gtk_gesture_single_set_button(GTK_GESTURE_SINGLE(drag), 0);
g_signal_connect(drag, "drag-begin",
G_CALLBACK(on_drag_begin), self);
g_signal_connect(drag, "drag-update",
G_CALLBACK(on_drag_update), self);
g_signal_connect(drag, "drag-end",
G_CALLBACK(on_drag_end), self);
}
// --- Public interface --------------------------------------------------------
static FivIoImage *
open_without_swapping_in(FivView *self, const char *uri)
{
FivIoOpenContext ctx = {
.uri = uri,
.screen_profile = self->enable_cms ? self->screen_cms_profile : NULL,
.screen_dpi = 96, // TODO(p): Try to retrieve it from the screen.
.enhance = self->enhance,
.warnings = g_ptr_array_new_with_free_func(g_free),
};
GError *error = NULL;
FivIoImage *image = fiv_io_open(&ctx, &error);
if (error) {
g_ptr_array_add(ctx.warnings, g_strdup(error->message));
g_error_free(error);
}
g_clear_pointer(&self->messages, g_free);
if (ctx.warnings->len) {
g_ptr_array_add(ctx.warnings, NULL);
self->messages = g_strjoinv("\n", (gchar **) ctx.warnings->pdata);
}
g_ptr_array_free(ctx.warnings, TRUE);
return image;
}
// TODO(p): Progressive picture loading, or at least async/cancellable.
gboolean
fiv_view_set_uri(FivView *self, const char *uri)
{
// This is extremely expensive, and only works sometimes.
g_clear_pointer(&self->enhance_swap, fiv_io_image_unref);
if (self->enhance) {
self->enhance = FALSE;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_ENHANCE]);
}
FivIoImage *image = open_without_swapping_in(self, uri);
g_clear_pointer(&self->image, fiv_io_image_unref);
self->frame = self->page = NULL;
self->image = image;
switch_page(self, self->image);
// Otherwise, adjustment values and zoom are retained implicitly.
if (!self->fixate)
set_scale_to_fit(self, true);
g_free(self->uri);
self->uri = g_strdup(uri);
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_MESSAGES]);
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_HAS_IMAGE]);
return image != NULL;
}
static void
page_step(FivView *self, int step)
{
FivIoImage *page = step < 0
? self->page->page_previous
: self->page->page_next;
if (page)
switch_page(self, page);
}
static void
frame_step(FivView *self, int step)
{
stop_animating(self);
if (step > 0) {
// Decrease the loop counter as if running on a timer.
(void) advance_frame(self);
} else if (!step || !(self->frame = self->frame->frame_previous)) {
self->frame = self->page;
self->remaining_loops = 0;
}
gtk_widget_queue_draw(GTK_WIDGET(self));
}
static gboolean
reload(FivView *self)
{
FivIoImage *image = open_without_swapping_in(self, self->uri);
g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_MESSAGES]);
if (!image)
return FALSE;
g_clear_pointer(&self->image, fiv_io_image_unref);
g_clear_pointer(&self->enhance_swap, fiv_io_image_unref);
switch_page(self, (self->image = image));
return TRUE;
}
static void
swap_enhanced_image(FivView *self)
{
FivIoImage *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));
}
}
static void
transformed_to_real(FivView *self, double *x, double *y)
{
double sw = 0, sh = 0;
cairo_matrix_t matrix =
fiv_io_orientation_apply(self->page, self->orientation, &sw, &sh);
cairo_matrix_transform_point(&matrix, x, y);
}
static void
set_orientation(FivView *self, FivIoOrientation orientation)
{
GtkAllocation allocation;
gtk_widget_get_allocation(GTK_WIDGET(self), &allocation);
// In the future, rotating gestures can pick another centre point.
double focus_x = 0.5 * allocation.width;
double focus_y = 0.5 * allocation.height;
double surface_x = focus_x;
double surface_y = focus_y;
widget_to_surface(self, &surface_x, &surface_y);
transformed_to_real(self, &surface_x, &surface_y);
self->orientation = orientation;
// Similar to set_scale().
Dimensions surface_dimensions = {};
cairo_matrix_t matrix =
fiv_io_orientation_apply(self->page, self->orientation,
&surface_dimensions.width, &surface_dimensions.height);
if (self->hadjustment && self->vadjustment &&
cairo_matrix_invert(&matrix) == CAIRO_STATUS_SUCCESS) {
cairo_matrix_transform_point(&matrix, &surface_x, &surface_y);
update_adjustments(self);
if (surface_dimensions.width * self->scale > allocation.width)
gtk_adjustment_set_value(
self->hadjustment, surface_x * self->scale - focus_x);
if (surface_dimensions.height * self->scale > allocation.height)
gtk_adjustment_set_value(
self->vadjustment, surface_y * self->scale - focus_y);
}
gtk_widget_queue_resize(GTK_WIDGET(self));
}
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_RELOAD:
reload(self);
break; case FIV_VIEW_COMMAND_ROTATE_LEFT:
set_orientation(self, view_left[self->orientation]);
break; case FIV_VIEW_COMMAND_MIRROR:
set_orientation(self, view_mirror[self->orientation]);
break; case FIV_VIEW_COMMAND_ROTATE_RIGHT:
set_orientation(self, view_right[self->orientation]);
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 (FivIoImage *I = self->page; (I = I->page_next); )
self->page = I;
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);
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;
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_COPY:
copy(self);
break; case FIV_VIEW_COMMAND_PRINT:
print(self);
break; case FIV_VIEW_COMMAND_SAVE_PAGE:
save_as(self, NULL);
break; case FIV_VIEW_COMMAND_SAVE_FRAME:
save_as(self, self->frame);
break; case FIV_VIEW_COMMAND_INFO:
info(self);
break; case FIV_VIEW_COMMAND_ZOOM_IN:
set_scale(self, self->scale * SCALE_STEP, NULL);
break; case FIV_VIEW_COMMAND_ZOOM_OUT:
set_scale(self, self->scale / SCALE_STEP, NULL);
break; case FIV_VIEW_COMMAND_ZOOM_1:
set_scale(self, 1.0, NULL);
break; case FIV_VIEW_COMMAND_FIT_WIDTH:
set_scale_to_fit_width(self);
break; case FIV_VIEW_COMMAND_FIT_HEIGHT:
set_scale_to_fit_height(self);
break; case FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT:
set_scale_to_fit(self, !self->scale_to_fit);
break; case FIV_VIEW_COMMAND_TOGGLE_FIXATE:
if ((self->fixate = !self->fixate))
set_scale_to_fit(self, false);
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_FIXATE]);
}
}