Merge branch 'feature/upstream' into develop

1 files changed, 311 insertions, 0 deletions

diff --git a/src/editing_tools/RGBHistogramManipulator.vala b/src/editing_tools/RGBHistogramManipulator.vala
new file mode 100644
index 0000000..4b0a8a2
--- /dev/null
+++ b/src/editing_tools/RGBHistogramManipulator.vala
@@ -0,0 +1,311 @@
+/* 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 class RGBHistogramManipulator : Gtk.DrawingArea {
+    private enum LocationCode { LEFT_NUB, RIGHT_NUB, LEFT_TROUGH, RIGHT_TROUGH,
+        INSENSITIVE_AREA }
+    private const int NUB_SIZE = 13;
+    private const int NUB_HALF_WIDTH = NUB_SIZE / 2;
+    private const int NUB_V_NUDGE = 4;
+    private const int TROUGH_WIDTH = 256 + (2 * NUB_HALF_WIDTH);
+    private const int TROUGH_HEIGHT = 4;
+    private const int TROUGH_BOTTOM_OFFSET = 1;
+    private const int CONTROL_WIDTH = TROUGH_WIDTH + 2;
+    private const int CONTROL_HEIGHT = 118;
+    private const int NUB_V_POSITION = CONTROL_HEIGHT - TROUGH_HEIGHT - TROUGH_BOTTOM_OFFSET
+        - (NUB_SIZE - TROUGH_HEIGHT) / 2 - NUB_V_NUDGE - 2;
+    private int left_nub_max = 255 - NUB_SIZE - 1;
+    private int right_nub_min = NUB_SIZE + 1;
+
+    private static Gtk.WidgetPath slider_draw_path = new Gtk.WidgetPath();
+    private static Gtk.WidgetPath frame_draw_path = new Gtk.WidgetPath();
+    private static bool paths_setup = false;
+
+    private RGBHistogram histogram = null;
+    private int left_nub_position = 0;
+    private int right_nub_position = 255;
+    private bool is_left_nub_tracking = false;
+    private bool is_right_nub_tracking = false;
+    private int track_start_x = 0;
+    private int track_nub_start_position = 0;
+    private int offset = 0;
+
+    public RGBHistogramManipulator( ) {
+        set_size_request(CONTROL_WIDTH, CONTROL_HEIGHT);
+        can_focus = true;
+        
+        if (!paths_setup) {
+            slider_draw_path.append_type(typeof(Gtk.Scale));
+            slider_draw_path.iter_add_class(0, "scale");
+            slider_draw_path.iter_add_class(0, "range");
+            
+            frame_draw_path.append_type(typeof(Gtk.Frame));
+            frame_draw_path.iter_add_class(0, "default");
+            
+            paths_setup = true;
+        }
+            
+        add_events(Gdk.EventMask.BUTTON_PRESS_MASK);
+        add_events(Gdk.EventMask.BUTTON_RELEASE_MASK);
+        add_events(Gdk.EventMask.BUTTON_MOTION_MASK);
+        add_events(Gdk.EventMask.FOCUS_CHANGE_MASK);
+        add_events(Gdk.EventMask.KEY_PRESS_MASK);
+
+        button_press_event.connect(on_button_press);
+        button_release_event.connect(on_button_release);
+        motion_notify_event.connect(on_button_motion);
+
+        this.size_allocate.connect(on_size_allocate);
+    }
+
+    private void on_size_allocate(Gtk.Allocation region) {
+        this.offset = (region.width - RGBHistogram.GRAPHIC_WIDTH - NUB_SIZE) / 2;
+    }
+
+    private LocationCode hit_test_point(int x, int y) {
+        if (y < NUB_V_POSITION)
+            return LocationCode.INSENSITIVE_AREA;
+
+        if ((x > left_nub_position) && (x < left_nub_position + NUB_SIZE))
+            return LocationCode.LEFT_NUB;
+
+        if ((x > right_nub_position) && (x < right_nub_position + NUB_SIZE))
+            return LocationCode.RIGHT_NUB;
+
+        if (y < (NUB_V_POSITION + NUB_V_NUDGE + 1))
+            return LocationCode.INSENSITIVE_AREA;
+
+        if ((x - left_nub_position) * (x - left_nub_position) <
+            (x - right_nub_position) * (x - right_nub_position))
+            return LocationCode.LEFT_TROUGH;
+        else
+            return LocationCode.RIGHT_TROUGH;
+    }
+    
+    private bool on_button_press(Gdk.EventButton event_record) {
+        // Adjust mouse position to drawing offset
+        // Easier to modify the event and shit the whole drawing then adjusting the nub drawing code
+        event_record.x -= this.offset;
+        LocationCode loc = hit_test_point((int) event_record.x, (int) event_record.y);
+        bool retval = true;
+
+        switch (loc) {
+            case LocationCode.LEFT_NUB:
+                track_start_x = ((int) event_record.x);
+                track_nub_start_position = left_nub_position;
+                is_left_nub_tracking = true;
+                break;
+
+            case LocationCode.RIGHT_NUB:
+                track_start_x = ((int) event_record.x);
+                track_nub_start_position = right_nub_position;
+                is_right_nub_tracking = true;
+                break;
+
+            case LocationCode.LEFT_TROUGH:
+                left_nub_position = ((int) event_record.x) - NUB_HALF_WIDTH;
+                left_nub_position = left_nub_position.clamp(0, left_nub_max);
+                force_update();
+                nub_position_changed();
+                update_nub_extrema();
+                break;
+
+            case LocationCode.RIGHT_TROUGH:
+                right_nub_position = ((int) event_record.x) - NUB_HALF_WIDTH;
+                right_nub_position = right_nub_position.clamp(right_nub_min, 255);
+                force_update();
+                nub_position_changed();
+                update_nub_extrema();
+                break;
+
+            default:
+                retval = false;
+                break;
+        }
+
+        // Remove adjustment position to drawing offset
+        event_record.x += this.offset;
+
+        return retval;
+    }
+    
+    private bool on_button_release(Gdk.EventButton event_record) {
+        if (is_left_nub_tracking || is_right_nub_tracking) {
+            nub_position_changed();
+            update_nub_extrema();
+        }
+
+        is_left_nub_tracking = false;
+        is_right_nub_tracking = false;
+
+        return false;
+    }
+    
+    private bool on_button_motion(Gdk.EventMotion event_record) {
+        if ((!is_left_nub_tracking) && (!is_right_nub_tracking))
+            return false;
+    
+        event_record.x -= this.offset;
+        if (is_left_nub_tracking) {
+            int track_x_delta = ((int) event_record.x) - track_start_x;
+            left_nub_position = (track_nub_start_position + track_x_delta);
+            left_nub_position = left_nub_position.clamp(0, left_nub_max);
+        } else { /* right nub is tracking */
+            int track_x_delta = ((int) event_record.x) - track_start_x;
+            right_nub_position = (track_nub_start_position + track_x_delta);
+            right_nub_position = right_nub_position.clamp(right_nub_min, 255);
+        }
+        
+        force_update();
+        event_record.x += this.offset;
+
+        return true;
+    }
+
+    public override bool focus_out_event(Gdk.EventFocus event) {
+        if (base.focus_out_event(event)) {
+            return true;
+        }
+
+        queue_draw();
+
+        return false;
+    }
+
+    public override bool key_press_event(Gdk.EventKey event) {
+        if (base.key_press_event(event)) {
+            return true;
+        }
+
+        int delta = 0;
+
+        if (event.keyval == Gdk.Key.Left || event.keyval == Gdk.Key.Up) {
+            delta = -1;
+        }
+
+        if (event.keyval == Gdk.Key.Right || event.keyval == Gdk.Key.Down) {
+            delta = 1;
+        }
+
+        if (!(Gdk.ModifierType.CONTROL_MASK in event.state)) {
+            delta *= 5;
+        }
+
+        if (delta == 0) {
+            return false;
+        }
+
+        if (Gdk.ModifierType.SHIFT_MASK in event.state) {
+            right_nub_position += delta;
+            right_nub_position = right_nub_position.clamp(right_nub_min, 255);
+        } else {
+            left_nub_position += delta;
+            left_nub_position = left_nub_position.clamp(0, left_nub_max);
+
+        }
+
+        nub_position_changed();
+        update_nub_extrema();
+        force_update();
+
+        return true;
+    }
+    
+    public override bool draw(Cairo.Context ctx) {
+        Gtk.Border padding = get_style_context().get_padding(Gtk.StateFlags.NORMAL);
+
+        Gdk.Rectangle area = Gdk.Rectangle();
+        area.x = padding.left + this.offset;
+        area.y = padding.top;
+        area.width = RGBHistogram.GRAPHIC_WIDTH + padding.right;
+        area.height = RGBHistogram.GRAPHIC_HEIGHT + padding.bottom;
+
+        if (has_focus) {
+            get_style_context().render_focus(ctx, area.x, area.y,
+                                             area.width + NUB_SIZE,
+                                             area.height + NUB_SIZE + NUB_HALF_WIDTH);
+        }
+
+        draw_histogram(ctx, area);
+        draw_nub(ctx, area, left_nub_position);
+        draw_nub(ctx, area, right_nub_position);
+
+        return true;
+    }
+    
+    private void draw_histogram(Cairo.Context ctx, Gdk.Rectangle area) {
+        if (histogram == null)
+            return;
+
+        var histogram_graphic = histogram.get_graphic();
+
+        Gdk.cairo_set_source_pixbuf(ctx, histogram_graphic, area.x + NUB_HALF_WIDTH, area.y + 2);
+        ctx.paint();
+
+        if (left_nub_position > 0) {
+            ctx.rectangle(area.x + NUB_HALF_WIDTH, area.y + 2,
+                          left_nub_position,
+                          histogram_graphic.height);
+            ctx.set_source_rgba(0.0, 0.0, 0.0, 0.45);
+            ctx.fill();
+        }
+
+        if (right_nub_position < 255) {
+            ctx.rectangle(area.x + right_nub_position + NUB_HALF_WIDTH,
+                          area.y + 2,
+                          histogram_graphic.width - right_nub_position,
+                          histogram_graphic.height);
+            ctx.set_source_rgba(1.0, 1.0, 1.0, 0.45);
+            ctx.fill();
+        }
+    }
+
+    private void draw_nub(Cairo.Context ctx, Gdk.Rectangle area, int position) {
+        ctx.move_to(area.x + position, area.y + NUB_V_POSITION + NUB_SIZE);
+        ctx.line_to(area.x + position + NUB_HALF_WIDTH, area.y + NUB_V_POSITION);
+        ctx.line_to(area.x + position + NUB_SIZE, area.y + NUB_V_POSITION + NUB_SIZE);
+        ctx.close_path();
+        ctx.set_source_rgb(0.333, 0.333, 0.333);
+        ctx.fill();
+    }
+    
+    private void force_update() {
+        get_window().invalidate_rect(null, true);
+    }
+    
+    private void update_nub_extrema() {
+        right_nub_min = left_nub_position + NUB_SIZE + 1;
+        left_nub_max = right_nub_position - NUB_SIZE - 1;
+    }
+
+    public signal void nub_position_changed();
+
+    public void update_histogram(Gdk.Pixbuf source_pixbuf) {
+        histogram = new RGBHistogram(source_pixbuf);
+        force_update();
+    }
+    
+    public int get_left_nub_position() {
+        return left_nub_position;
+    }
+    
+    public int get_right_nub_position() {
+        return right_nub_position;
+    }
+
+    public void set_left_nub_position(int user_nub_pos) {
+        assert ((user_nub_pos >= 0) && (user_nub_pos <= 255));
+        left_nub_position = user_nub_pos.clamp(0, left_nub_max);
+        update_nub_extrema();
+    }
+    
+    public void set_right_nub_position(int user_nub_pos) {
+        assert ((user_nub_pos >= 0) && (user_nub_pos <= 255));
+        right_nub_position = user_nub_pos.clamp(right_nub_min, 255);
+        update_nub_extrema();
+    }
+}
+