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authorJörg Frings-Fürst <debian@jff.email>2023-06-14 20:35:58 +0200
committerJörg Frings-Fürst <debian@jff.email>2023-06-14 20:35:58 +0200
commitd443a3c2509889533ca812c163056bace396b586 (patch)
treee94ffc0d9c054ca4efb8fb327e18dfac88e15dc7 /src/SinglePhotoPage.vala
parentbb9797c14470641b082ebf635e2ae3cfd5f27a3b (diff)
New upstream version 0.32.1upstream/0.32.1
Diffstat (limited to 'src/SinglePhotoPage.vala')
-rw-r--r--src/SinglePhotoPage.vala537
1 files changed, 537 insertions, 0 deletions
diff --git a/src/SinglePhotoPage.vala b/src/SinglePhotoPage.vala
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+/* Copyright 2016 Software Freedom Conservancy Inc.
+ *
+ * This software is licensed under the GNU LGPL (version 2.1 or later).
+ * See the COPYING file in this distribution.
+ */
+
+public abstract class SinglePhotoPage : Page {
+ public const Gdk.InterpType FAST_INTERP = Gdk.InterpType.NEAREST;
+ public const Gdk.InterpType QUALITY_INTERP = Gdk.InterpType.BILINEAR;
+ public const int KEY_REPEAT_INTERVAL_MSEC = 200;
+
+ public enum UpdateReason {
+ NEW_PIXBUF,
+ QUALITY_IMPROVEMENT,
+ RESIZED_CANVAS
+ }
+
+ protected Gtk.DrawingArea canvas = new Gtk.DrawingArea();
+ protected Gtk.Viewport viewport = new Gtk.Viewport(null, null);
+
+ private bool scale_up_to_viewport;
+ private TransitionClock transition_clock;
+ private int transition_duration_msec = 0;
+ private Cairo.Surface pixmap = null;
+ private Cairo.Context pixmap_ctx = null;
+ private Cairo.Context text_ctx = null;
+ private Dimensions pixmap_dim = Dimensions();
+ private Gdk.Pixbuf unscaled = null;
+ private Dimensions max_dim = Dimensions();
+ private Gdk.Pixbuf scaled = null;
+ private Gdk.Pixbuf old_scaled = null; // previous scaled image
+ private Gdk.Rectangle scaled_pos = Gdk.Rectangle();
+ private ZoomState static_zoom_state;
+ private bool zoom_high_quality = true;
+ private ZoomState saved_zoom_state;
+ private bool has_saved_zoom_state = false;
+ private uint32 last_nav_key = 0;
+
+ protected SinglePhotoPage(string page_name, bool scale_up_to_viewport) {
+ base(page_name);
+ this.wheel_factor = 0.9999;
+
+ this.scale_up_to_viewport = scale_up_to_viewport;
+
+ transition_clock = TransitionEffectsManager.get_instance().create_null_transition_clock();
+
+ // With the current code automatically resizing the image to the viewport, scrollbars
+ // should never be shown, but this may change if/when zooming is supported
+ set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC);
+
+ set_border_width(0);
+ set_shadow_type(Gtk.ShadowType.NONE);
+
+ viewport.set_shadow_type(Gtk.ShadowType.NONE);
+ viewport.set_border_width(0);
+ viewport.add(canvas);
+
+ add(viewport);
+
+ canvas.add_events(Gdk.EventMask.EXPOSURE_MASK | Gdk.EventMask.STRUCTURE_MASK
+ | Gdk.EventMask.SUBSTRUCTURE_MASK);
+
+ viewport.size_allocate.connect(on_viewport_resize);
+ canvas.draw.connect(on_canvas_exposed);
+
+ set_event_source(canvas);
+ Config.Facade.get_instance().colors_changed.connect(on_colors_changed);
+ }
+
+ ~SinglePhotoPage() {
+ Config.Facade.get_instance().colors_changed.disconnect(on_colors_changed);
+ }
+
+ public bool is_transition_in_progress() {
+ return transition_clock.is_in_progress();
+ }
+
+ public void cancel_transition() {
+ if (transition_clock.is_in_progress())
+ transition_clock.cancel();
+ }
+
+ public void set_transition(string effect_id, int duration_msec) {
+ cancel_transition();
+
+ transition_clock = TransitionEffectsManager.get_instance().create_transition_clock(effect_id);
+ if (transition_clock == null)
+ transition_clock = TransitionEffectsManager.get_instance().create_null_transition_clock();
+
+ transition_duration_msec = duration_msec;
+ }
+
+ // This method includes a call to pixmap_ctx.paint().
+ private void render_zoomed_to_pixmap(ZoomState zoom_state) {
+ assert(is_zoom_supported());
+
+ Gdk.Rectangle view_rect = zoom_state.get_viewing_rectangle_wrt_content();
+
+ Gdk.Pixbuf zoomed;
+ if (get_zoom_buffer() != null) {
+ zoomed = (zoom_high_quality) ? get_zoom_buffer().get_zoomed_image(zoom_state) :
+ get_zoom_buffer().get_zoom_preview_image(zoom_state);
+ } else {
+ Gdk.Rectangle view_rect_proj = zoom_state.get_viewing_rectangle_projection(unscaled);
+
+ Gdk.Pixbuf proj_subpixbuf = new Gdk.Pixbuf.subpixbuf(unscaled, view_rect_proj.x,
+ view_rect_proj.y, view_rect_proj.width, view_rect_proj.height);
+
+ zoomed = proj_subpixbuf.scale_simple(view_rect.width, view_rect.height,
+ Gdk.InterpType.BILINEAR);
+ }
+
+ if (zoomed == null) {
+ return;
+ }
+
+ int draw_x = (pixmap_dim.width - view_rect.width) / 2;
+ draw_x = draw_x.clamp(0, int.MAX);
+
+ int draw_y = (pixmap_dim.height - view_rect.height) / 2;
+ draw_y = draw_y.clamp(0, int.MAX);
+ paint_pixmap_with_background(pixmap_ctx, zoomed, draw_x, draw_y);
+ }
+
+ protected void on_interactive_zoom(ZoomState interactive_zoom_state) {
+ assert(is_zoom_supported());
+
+ set_source_color_from_string(pixmap_ctx, "#000");
+ pixmap_ctx.paint();
+
+ bool old_quality_setting = zoom_high_quality;
+ zoom_high_quality = false;
+ render_zoomed_to_pixmap(interactive_zoom_state);
+ zoom_high_quality = old_quality_setting;
+
+ canvas.queue_draw();
+ }
+
+ protected void on_interactive_pan(ZoomState interactive_zoom_state) {
+ assert(is_zoom_supported());
+
+ set_source_color_from_string(pixmap_ctx, "#000");
+ pixmap_ctx.paint();
+
+ bool old_quality_setting = zoom_high_quality;
+ zoom_high_quality = true;
+ render_zoomed_to_pixmap(interactive_zoom_state);
+ zoom_high_quality = old_quality_setting;
+
+ canvas.queue_draw();
+ }
+
+ protected virtual bool is_zoom_supported() {
+ return false;
+ }
+
+ protected virtual void cancel_zoom() {
+ if (pixmap != null) {
+ set_source_color_from_string(pixmap_ctx, "#000");
+ pixmap_ctx.paint();
+ }
+ }
+
+ protected virtual void save_zoom_state() {
+ saved_zoom_state = static_zoom_state;
+ has_saved_zoom_state = true;
+ }
+
+ protected virtual void restore_zoom_state() {
+ if (!has_saved_zoom_state)
+ return;
+
+ static_zoom_state = saved_zoom_state;
+ repaint();
+ has_saved_zoom_state = false;
+ }
+
+ protected virtual ZoomBuffer? get_zoom_buffer() {
+ return null;
+ }
+
+ protected ZoomState get_saved_zoom_state() {
+ return saved_zoom_state;
+ }
+
+ protected void set_zoom_state(ZoomState zoom_state) {
+ assert(is_zoom_supported());
+
+ static_zoom_state = zoom_state;
+ }
+
+ protected ZoomState get_zoom_state() {
+ assert(is_zoom_supported());
+
+ return static_zoom_state;
+ }
+
+ public override void switched_to() {
+ base.switched_to();
+
+ if (unscaled != null)
+ repaint();
+ }
+
+ public override void set_container(Gtk.Window container) {
+ base.set_container(container);
+
+ // scrollbar policy in fullscreen mode needs to be auto/auto, else the pixbuf will shift
+ // off the screen
+ if (container is FullscreenWindow)
+ set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC);
+ }
+
+ // max_dim represents the maximum size of the original pixbuf (i.e. pixbuf may be scaled and
+ // the caller capable of producing larger ones depending on the viewport size). max_dim
+ // is used when scale_up_to_viewport is set to true. Pass a Dimensions with no area if
+ // max_dim should be ignored (i.e. scale_up_to_viewport is false).
+ public void set_pixbuf(Gdk.Pixbuf unscaled, Dimensions max_dim, Direction? direction = null) {
+ static_zoom_state = ZoomState(max_dim, pixmap_dim,
+ static_zoom_state.get_interpolation_factor(),
+ static_zoom_state.get_viewport_center());
+
+ cancel_transition();
+
+ this.unscaled = unscaled;
+ this.max_dim = max_dim;
+ this.old_scaled = scaled;
+ scaled = null;
+
+ // need to make sure this has happened
+ canvas.realize();
+
+ repaint(direction);
+ }
+
+ public void blank_display() {
+ unscaled = null;
+ max_dim = Dimensions();
+ scaled = null;
+ pixmap = null;
+
+ // this has to have happened
+ canvas.realize();
+
+ // force a redraw
+ invalidate_all();
+ }
+
+ public Cairo.Surface? get_surface() {
+ return pixmap;
+ }
+
+ public Dimensions get_surface_dim() {
+ return pixmap_dim;
+ }
+
+ public Cairo.Context get_cairo_context() {
+ return pixmap_ctx;
+ }
+
+ public void paint_text(Pango.Layout pango_layout, int x, int y) {
+ text_ctx.move_to(x, y);
+ Pango.cairo_show_layout(text_ctx, pango_layout);
+ }
+
+ public Scaling get_canvas_scaling() {
+ return (get_container() is FullscreenWindow) ? Scaling.for_screen(AppWindow.get_instance(), scale_up_to_viewport)
+ : Scaling.for_widget(viewport, scale_up_to_viewport);
+ }
+
+ public Gdk.Pixbuf? get_unscaled_pixbuf() {
+ return unscaled;
+ }
+
+ public Gdk.Pixbuf? get_scaled_pixbuf() {
+ return scaled;
+ }
+
+ // Returns a rectangle describing the pixbuf in relation to the canvas
+ public Gdk.Rectangle get_scaled_pixbuf_position() {
+ return scaled_pos;
+ }
+
+ public bool is_inside_pixbuf(int x, int y) {
+ return coord_in_rectangle((int)Math.lround(x * Application.get_scale()),
+ (int)Math.lround(y * Application.get_scale()), scaled_pos);
+ }
+
+ public void invalidate(Gdk.Rectangle rect) {
+ if (canvas.get_window() != null)
+ canvas.get_window().invalidate_rect(rect, false);
+ }
+
+ public void invalidate_all() {
+ if (canvas.get_window() != null)
+ canvas.get_window().invalidate_rect(null, false);
+ }
+
+ private void on_viewport_resize() {
+ // do fast repaints while resizing
+ internal_repaint(true, null);
+ }
+
+ protected override void on_resize_finished(Gdk.Rectangle rect) {
+ base.on_resize_finished(rect);
+
+ // when the resize is completed, do a high-quality repaint
+ repaint();
+ }
+
+ private bool on_canvas_exposed(Cairo.Context exposed_ctx) {
+ // draw pixmap onto canvas unless it's not been instantiated, in which case draw black
+ // (so either old image or contents of another page is not left on screen)
+ if (pixmap != null) {
+ pixmap.set_device_scale(Application.get_scale(), Application.get_scale());
+ exposed_ctx.set_source_surface(pixmap, 0, 0);
+ }
+ else
+ set_source_color_from_string(exposed_ctx, "#000");
+
+ exposed_ctx.rectangle(0, 0, get_allocated_width(), get_allocated_height());
+ exposed_ctx.paint();
+
+ if (pixmap != null) {
+ pixmap.set_device_scale(1.0, 1.0);
+ }
+
+ return true;
+ }
+
+ protected virtual void new_surface(Cairo.Context ctx, Dimensions ctx_dim) {
+ }
+
+ protected virtual void updated_pixbuf(Gdk.Pixbuf pixbuf, UpdateReason reason, Dimensions old_dim) {
+ }
+
+ protected virtual void paint(Cairo.Context ctx, Dimensions ctx_dim) {
+ if (is_zoom_supported() && (!static_zoom_state.is_default())) {
+ set_source_color_from_string(ctx, "#000");
+ ctx.rectangle(0, 0, pixmap_dim.width, pixmap_dim.height);
+ ctx.fill();
+
+ render_zoomed_to_pixmap(static_zoom_state);
+ } else if (!transition_clock.paint(ctx, ctx_dim.width, ctx_dim.height)) {
+ // transition is not running, so paint the full image on a black background
+ set_source_color_from_string(ctx, "#000");
+
+ ctx.rectangle(0, 0, pixmap_dim.width, pixmap_dim.height);
+ ctx.fill();
+
+ //scaled.save("src%010d.png".printf(buffer_counter), "png");
+ paint_pixmap_with_background(ctx, scaled, scaled_pos.x, scaled_pos.y);
+ //pixmap.write_to_png("%010d.png".printf(buffer_counter++));
+ }
+ }
+
+ private void repaint_pixmap() {
+ if (pixmap_ctx == null)
+ return;
+
+ paint(pixmap_ctx, pixmap_dim);
+ invalidate_all();
+ }
+
+ public void repaint(Direction? direction = null) {
+ internal_repaint(false, direction);
+ }
+
+ private void internal_repaint(bool fast, Direction? direction) {
+ // if not in view, assume a full repaint needed in future but do nothing more
+ if (!is_in_view()) {
+ pixmap = null;
+ scaled = null;
+
+ return;
+ }
+
+ // no image or window, no painting
+ if (unscaled == null || canvas.get_window() == null)
+ return;
+
+ Gtk.Allocation allocation;
+ viewport.get_allocation(out allocation);
+
+ int width = allocation.width;
+ int height = allocation.height;
+
+ if (width <= 0 || height <= 0)
+ return;
+
+ bool new_pixbuf = (scaled == null);
+
+ // save if reporting an image being rescaled
+ Dimensions old_scaled_dim = Dimensions.for_rectangle(scaled_pos);
+
+ Gdk.Rectangle old_scaled_pos = scaled_pos;
+
+ // attempt to reuse pixmap
+ if (pixmap_dim.width != width || pixmap_dim.height != height)
+ pixmap = null;
+
+ // if necessary, create a pixmap as large as the entire viewport
+ bool new_pixmap = false;
+ if (pixmap == null) {
+ init_pixmap((int)Math.lround(width * Application.get_scale()), (int)Math.lround(height * Application.get_scale()));
+ new_pixmap = true;
+ }
+
+ if (new_pixbuf || new_pixmap) {
+ Dimensions unscaled_dim = Dimensions.for_pixbuf(unscaled);
+
+ // determine scaled size of pixbuf ... if a max dimensions is set and not scaling up,
+ // respect it
+ Dimensions scaled_dim = Dimensions();
+ if (!scale_up_to_viewport && max_dim.has_area() && max_dim.width < width && max_dim.height < height)
+ scaled_dim = max_dim;
+ else
+ scaled_dim = unscaled_dim.get_scaled_proportional(pixmap_dim);
+
+ // center pixbuf on the canvas
+ scaled_pos.x = (int)Math.lround(((width * Application.get_scale()) - scaled_dim.width) / 2.0);
+ scaled_pos.y = (int)Math.lround(((height * Application.get_scale()) - scaled_dim.height) / 2.0);
+ scaled_pos.width = scaled_dim.width;
+ scaled_pos.height = scaled_dim.height;
+ }
+
+ Gdk.InterpType interp = (fast) ? FAST_INTERP : QUALITY_INTERP;
+
+ // rescale if canvas rescaled or better quality is requested
+ if (scaled == null) {
+ scaled = resize_pixbuf(unscaled, Dimensions.for_rectangle(scaled_pos), interp);
+
+ UpdateReason reason = UpdateReason.RESIZED_CANVAS;
+ if (new_pixbuf)
+ reason = UpdateReason.NEW_PIXBUF;
+ else if (!new_pixmap && interp == QUALITY_INTERP)
+ reason = UpdateReason.QUALITY_IMPROVEMENT;
+
+ static_zoom_state = ZoomState(max_dim, pixmap_dim,
+ static_zoom_state.get_interpolation_factor(),
+ static_zoom_state.get_viewport_center());
+
+ updated_pixbuf(scaled, reason, old_scaled_dim);
+ }
+
+ zoom_high_quality = !fast;
+
+ if (direction != null && !transition_clock.is_in_progress()) {
+ Spit.Transitions.Visuals visuals = new Spit.Transitions.Visuals(old_scaled,
+ old_scaled_pos, scaled, scaled_pos, parse_color("#000"));
+
+ transition_clock.start(visuals, direction.to_transition_direction(), transition_duration_msec,
+ repaint_pixmap);
+ }
+
+ if (!transition_clock.is_in_progress())
+ repaint_pixmap();
+ }
+
+ private void init_pixmap(int width, int height) {
+ assert(unscaled != null);
+ assert(canvas.get_window() != null);
+
+ // Cairo backing surface (manual double-buffering)
+ pixmap = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
+ pixmap_dim = Dimensions(width, height);
+
+ // Cairo context for drawing on the pixmap
+ pixmap_ctx = new Cairo.Context(pixmap);
+
+ // need a new pixbuf to fit this scale
+ scaled = null;
+
+ // Cairo context for drawing text on the pixmap
+ text_ctx = new Cairo.Context(pixmap);
+ set_source_color_from_string(text_ctx, "#fff");
+
+
+ // no need to resize canvas, viewport does that automatically
+
+ new_surface(pixmap_ctx, pixmap_dim);
+ }
+
+ protected override bool on_context_keypress() {
+ return popup_context_menu(get_page_context_menu());
+ }
+
+ protected virtual void on_previous_photo() {
+ }
+
+ protected virtual void on_next_photo() {
+ }
+
+ public override bool key_press_event(Gdk.EventKey event) {
+ // if the user holds the arrow keys down, we will receive a steady stream of key press
+ // events for an operation that isn't designed for a rapid succession of output ...
+ // we staunch the supply of new photos to under a quarter second (#533)
+ bool nav_ok = (event.time - last_nav_key) > KEY_REPEAT_INTERVAL_MSEC;
+
+ bool handled = true;
+ switch (Gdk.keyval_name(event.keyval)) {
+ case "Left":
+ case "KP_Left":
+ case "BackSpace":
+ if (nav_ok) {
+ on_previous_photo();
+ last_nav_key = event.time;
+ }
+ break;
+
+ case "Right":
+ case "KP_Right":
+ case "space":
+ if (nav_ok) {
+ on_next_photo();
+ last_nav_key = event.time;
+ }
+ break;
+
+ default:
+ handled = false;
+ break;
+ }
+
+ if (handled)
+ return true;
+
+ return (base.key_press_event != null) ? base.key_press_event(event) : true;
+ }
+
+ private void on_colors_changed() {
+ invalidate_transparent_background();
+ repaint();
+ }
+}
+
+