New upstream version 0.32.1upstream/0.32.1

1 files changed, 537 insertions, 0 deletions

diff --git a/src/SinglePhotoPage.vala b/src/SinglePhotoPage.vala
new file mode 100644
index 0000000..754a649
--- /dev/null
+++ b/src/SinglePhotoPage.vala
@@ -0,0 +1,537 @@
+/* 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();
+    }
+}
+
+