// // fiv-view.c: image viewing widget // // Copyright (c) 2021, Přemysl Eric Janouch // // 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 #include #include #ifdef GDK_WINDOWING_X11 #include #endif // GDK_WINDOWING_X11 #ifdef GDK_WINDOWING_QUARTZ #include #endif // GDK_WINDOWING_QUARTZ struct _FivView { GtkWidget parent_instance; gchar *uri; ///< Path to the current image (if any) 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 double scale; ///< Scaling factor cairo_surface_t *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(FivView, fiv_view, GTK_TYPE_WIDGET) 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] = FivIoOrientation270, [FivIoOrientation90] = FivIoOrientationMirror270, [FivIoOrientationMirror90] = FivIoOrientation90, [FivIoOrientation270] = FivIoOrientationMirror270, }; 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_SCALE = 1, PROP_SCALE_TO_FIT, 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 }; 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); g_free(self->uri); 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; 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 && 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; 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 Dimensions get_surface_dimensions(FivView *self) { if (!self->image) return (Dimensions) {}; cairo_rectangle_t extents = {}; 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)) cairo_recording_surface_ink_extents(self->page, &extents.x, &extents.y, &extents.width, &extents.height); break; default: g_assert_not_reached(); } if (fiv_io_orientation_is_sideways(self->orientation)) return (Dimensions) {extents.height, extents.width}; return (Dimensions) {extents.width, extents.height}; } 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 fiv_view_get_preferred_height(GtkWidget *widget, gint *minimum, gint *natural) { 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; } } static void fiv_view_get_preferred_width(GtkWidget *widget, gint *minimum, gint *natural) { 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); if (!self->image || !self->scale_to_fit) return; Dimensions 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]); } // 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(); } 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), .event_mask = gtk_widget_get_events(widget) | GDK_SCROLL_MASK | GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK, }; // We need this window to receive input events at all. GdkWindow *window = gdk_window_new(gtk_widget_get_parent_window(widget), &attributes, GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL); // Without the following call, or the rendering mode set to "recording", // RGB30 degrades to RGB24, because gdk_window_begin_paint_internal() // creates backing stores using cairo_content_t constants. // // It completely breaks the Quartz backend, so limit it to X11. #ifdef GDK_WINDOWING_X11 // FIXME: This causes some flicker while scrolling, because it disables // double buffering, see: https://gitlab.gnome.org/GNOME/gtk/-/issues/2560 // // If GTK+'s OpenGL integration fails to deliver, we need to use the window // directly, sidestepping the toolkit entirely. if (GDK_IS_X11_WINDOW(window)) gdk_window_ensure_native(window); #endif // GDK_WINDOWING_X11 gtk_widget_register_window(widget, window); gtk_widget_set_window(widget, window); gtk_widget_set_realized(widget, TRUE); 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 w, h; get_display_dimensions(self, &w, &h); double x = 0; double y = 0; if (w < allocation.width) x = round((allocation.width - w) / 2.); if (h < allocation.height) y = round((allocation.height - h) / 2.); Dimensions surface_dimensions = get_surface_dimensions(self); cairo_matrix_t matrix = fiv_io_orientation_matrix( 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, 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. if (cairo_surface_get_type(self->frame) == CAIRO_SURFACE_TYPE_RECORDING) { cairo_surface_t *image = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h); cairo_t *tcr = cairo_create(image); cairo_scale(tcr, self->scale, self->scale); cairo_set_source_surface(tcr, self->frame, 0, 0); cairo_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); 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); // 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) { GTK_WIDGET_CLASS(fiv_view_parent_class)->button_press_event(widget, event); if (event->button == GDK_BUTTON_PRIMARY && gtk_widget_get_focus_on_click(widget)) gtk_widget_grab_focus(widget); // TODO(p): Use for left button scroll drag, which may rather be a gesture. return FALSE; } #define SCALE_STEP 1.25 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; } static gboolean fiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event) { FivView *self = FIV_VIEW(widget); if (!self->image) return FALSE; if (event->state & gtk_accelerator_get_default_mod_mask()) return FALSE; switch (event->direction) { case GDK_SCROLL_UP: return set_scale(self, self->scale * SCALE_STEP); case GDK_SCROLL_DOWN: return set_scale(self, self->scale / SCALE_STEP); default: // For some reason, we can also get GDK_SCROLL_SMOOTH. // Left/right are good to steal from GtkScrolledWindow for consistency. return TRUE; } } static void stop_animating(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; self->remaining_loops = 0; g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_PLAYING]); } static gboolean advance_frame(FivView *self) { cairo_surface_t *next = cairo_surface_get_user_data(self->frame, &fiv_io_key_frame_next); if (next) { self->frame = next; } else { if (self->remaining_loops && !--self->remaining_loops) return FALSE; self->frame = self->page; } return TRUE; } static gboolean advance_animation(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. intptr_t duration = (intptr_t) cairo_surface_get_user_data( self->frame, &fiv_io_key_frame_duration); if (duration < 0) return FALSE; // Do not busy loop. GIF timings are given in hundredths of a second. // Note that browsers seem to do [< 10] => 100: // https://bugs.webkit.org/show_bug.cgi?id=36082 if (duration == 0) duration = gdk_frame_timings_get_refresh_interval( gdk_frame_clock_get_current_timings(clock)) / 1000; if (duration == 0) duration = 1; gint64 then = self->frame_time + duration * 1000; if (then > now) return TRUE; if (!advance_frame(self)) return FALSE; self->frame_time = then; gtk_widget_queue_draw(GTK_WIDGET(self)); } } static void on_frame_clock_update(GdkFrameClock *clock, gpointer user_data) { 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 || !cairo_surface_get_user_data(self->page, &fiv_io_key_frame_next)) return; self->frame_time = gdk_frame_clock_get_frame_time(clock); self->frame_update_connection = g_signal_connect( clock, "update", G_CALLBACK(on_frame_clock_update), self); self->remaining_loops = (uintptr_t) cairo_surface_get_user_data(self->page, &fiv_io_key_loops); gdk_frame_clock_begin_updating(clock); g_object_notify_by_pspec(G_OBJECT(self), view_properties[PROP_PLAYING]); } static void switch_page(FivView *self, cairo_surface_t *page) { 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; 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 show_error_dialog(GtkWindow *parent, GError *error) { GtkWidget *dialog = gtk_message_dialog_new(parent, GTK_DIALOG_MODAL, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", error->message); gtk_dialog_run(GTK_DIALOG(dialog)); gtk_widget_destroy(dialog); g_error_free(error); } static GtkWindow * get_toplevel(GtkWidget *widget) { if (GTK_IS_WINDOW((widget = gtk_widget_get_toplevel(widget)))) return GTK_WINDOW(widget); return NULL; } static void on_draw_page(G_GNUC_UNUSED GtkPrintOperation *operation, GtkPrintContext *context, G_GNUC_UNUSED int page_nr, FivView *self) { // Any DPI will be wrong, unless we import that information from the image. double scale = 1 / 96.; Dimensions surface_dimensions = get_surface_dimensions(self); 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); cairo_set_source_surface(cr, self->frame, 0, 0); cairo_matrix_t matrix = fiv_io_orientation_matrix( self->orientation, surface_dimensions.width, surface_dimensions.height); 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, cairo_surface_t *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); const gchar *path = g_file_peek_path(file); // TODO(p): Use g_file_info_get_display_name(). gchar *basename = g_filename_display_basename(path ? path : self->uri); // 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 *name = g_strdup_printf(frame ? "%s.frame.webp" : "%s.webp", basename); gtk_file_chooser_set_current_name(chooser, name); g_free(name); if (path) { gchar *dirname = g_path_get_dirname(path); gtk_file_chooser_set_current_folder(chooser, dirname); g_free(dirname); } g_free(basename); g_object_unref(file); // 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 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; gchar *path = g_filename_from_uri(self->uri, NULL, &error); if (!path) { show_error_dialog(window, error); return; } GSubprocess *subprocess = g_subprocess_new(flags, &error, "exiftool", "-tab", "-groupNames", "-duplicates", "-extractEmbedded", "--binary", "-quiet", "--", path, NULL); g_free(path); 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; } static gboolean fiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event) { FivView *self = FIV_VIEW(widget); if (!self->image) return FALSE; // It should not matter that GDK_KEY_plus involves holding Shift. guint state = event->state & gtk_accelerator_get_default_mod_mask() & ~GDK_SHIFT_MASK; // The standard, intuitive bindings. if (state == GDK_CONTROL_MASK) { switch (event->keyval) { case GDK_KEY_0: return command(self, FIV_VIEW_COMMAND_ZOOM_1); case GDK_KEY_plus: return command(self, FIV_VIEW_COMMAND_ZOOM_IN); case GDK_KEY_minus: return command(self, FIV_VIEW_COMMAND_ZOOM_OUT); 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, self->frame); } } if (state == GDK_MOD1_MASK) { switch (event->keyval) { case GDK_KEY_Return: return command(self, FIV_VIEW_COMMAND_INFO); } } if (state != 0) return FALSE; switch (event->keyval) { case GDK_KEY_1: case GDK_KEY_2: case GDK_KEY_3: case GDK_KEY_4: case GDK_KEY_5: case GDK_KEY_6: case GDK_KEY_7: case GDK_KEY_8: case GDK_KEY_9: return set_scale(self, event->keyval - GDK_KEY_0); case GDK_KEY_plus: return command(self, FIV_VIEW_COMMAND_ZOOM_IN); case GDK_KEY_minus: return command(self, FIV_VIEW_COMMAND_ZOOM_OUT); case GDK_KEY_w: return set_scale_to_fit_width(self); case GDK_KEY_h: return set_scale_to_fit_height(self); case GDK_KEY_c: return command(self, FIV_VIEW_COMMAND_TOGGLE_CMS); case GDK_KEY_x: // Inspired by gThumb, which has more such modes. return command(self, FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT); case GDK_KEY_i: return command(self, FIV_VIEW_COMMAND_TOGGLE_FILTER); case GDK_KEY_t: return command(self, FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD); case GDK_KEY_e: return command(self, FIV_VIEW_COMMAND_TOGGLE_ENHANCE); 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); case GDK_KEY_braceleft: return command(self, FIV_VIEW_COMMAND_FRAME_PREVIOUS); case GDK_KEY_braceright: return command(self, FIV_VIEW_COMMAND_FRAME_NEXT); case GDK_KEY_space: return command(self, FIV_VIEW_COMMAND_TOGGLE_PLAYBACK); } return FALSE; } 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_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_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); 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; // 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; } // --- Public interface -------------------------------------------------------- // TODO(p): Progressive picture loading, or at least async/cancellable. gboolean fiv_view_open(FivView *self, const gchar *uri, GError **error) { cairo_surface_t *surface = fiv_io_open( uri, self->enable_cms ? self->screen_cms_profile : NULL, FALSE, error); if (!surface) return FALSE; if (self->image) cairo_surface_destroy(self->image); // 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]); } self->frame = self->page = NULL; self->image = surface; switch_page(self, self->image); 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_HAS_IMAGE]); 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->uri, 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); 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_PRINT: print(self); break; case FIV_VIEW_COMMAND_SAVE_PAGE: save_as(self, NULL); 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); } }