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/* Copyright 2009-2014 Yorba Foundation
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
namespace EditingTools {
/**
* An editing tool that allows one to introduce or remove a Dutch angle from
* a photograph.
*/
public class StraightenTool : EditingTool {
private const double MIN_ANGLE = -15.0;
private const double MAX_ANGLE = 15.0;
private const double INCREMENT = 0.1;
private const int MIN_SLIDER_SIZE = 160;
private const int MIN_LABEL_SIZE = 100;
private const int MIN_BUTTON_SIZE = 84;
private const int TEMP_PIXBUF_SIZE = 768;
private const double GUIDE_DASH[2] = {10, 10};
private const int REPAINT_ON_STOP_DELAY_MSEC = 100;
private class StraightenGuide {
private bool is_active = false;
private int x[2]; // start & end drag coords
private int y[2];
private double angle0; // current angle
public void reset(int x, int y, double angle) {
this.x = {x, x};
this.y = {y, y};
this.is_active = true;
this.angle0 = angle;
}
public bool update(int x, int y) {
if (this.is_active) {
this.x[1] = x;
this.y[1] = y;
return true;
}
return false;
}
public void clear() {
this.is_active = false;
}
public double? get_angle() {
double dx = x[1] - x[0];
double dy = y[1] - y[0];
// minimum radius to consider: discard clicks
if (dy*dy + dx*dx < 40)
return null;
// distinguish guides closer to horizontal or vertical
if (Math.fabs(dy) > Math.fabs(dx))
return angle0 + Math.atan(dx / dy) / Math.PI * 180;
else
return angle0 - Math.atan(dy / dx) / Math.PI * 180;
}
public void draw(Cairo.Context ctx) {
if (!is_active)
return;
double angle = get_angle() ?? 0.0;
if (angle == 0.0)
return;
double alpha = 1.0;
if (angle < MIN_ANGLE || angle > MAX_ANGLE)
alpha = 0.35;
// b&w dashing so it will be more visible on
// different backgrounds.
ctx.set_source_rgba(0.0, 0.0, 0.0, alpha);
ctx.set_dash(GUIDE_DASH, GUIDE_DASH[0] / 2);
ctx.move_to(x[0] + 0.5, y[0] + 0.5);
ctx.line_to(x[1] + 0.5, y[1] + 0.5);
ctx.stroke();
ctx.set_dash(GUIDE_DASH, -GUIDE_DASH[0] / 2);
ctx.set_source_rgba(1.0, 1.0, 1.0, alpha);
ctx.move_to(x[0] + 0.5, y[0] + 0.5);
ctx.line_to(x[1] + 0.5, y[1] + 0.5);
ctx.stroke();
}
}
private class StraightenToolWindow : EditingToolWindow {
public const int CONTROL_SPACING = 8;
public Gtk.Scale angle_slider = new Gtk.Scale.with_range(Gtk.Orientation.HORIZONTAL, MIN_ANGLE, MAX_ANGLE, INCREMENT);
public Gtk.Label angle_label = new Gtk.Label("");
public Gtk.Label description_label = new Gtk.Label(_("Angle:"));
public Gtk.Button ok_button = new Gtk.Button.with_mnemonic(_("_Straighten"));
public Gtk.Button cancel_button = new Gtk.Button.from_stock(Gtk.Stock.CANCEL);
public Gtk.Button reset_button = new Gtk.Button.with_mnemonic(_("_Reset"));
/**
* Prepare straighten tool's window for use and initialize all its controls.
*
* @param container The application's main window.
*/
public StraightenToolWindow(Gtk.Window container) {
base(container);
angle_slider.set_min_slider_size(MIN_SLIDER_SIZE);
angle_slider.set_size_request(MIN_SLIDER_SIZE, -1);
angle_slider.set_value(0.0);
angle_slider.set_draw_value(false);
description_label.set_padding(CONTROL_SPACING, 0);
angle_label.set_padding(0, 0);
angle_label.set_size_request(MIN_LABEL_SIZE,-1);
Gtk.Box slider_layout = new Gtk.Box(Gtk.Orientation.HORIZONTAL, CONTROL_SPACING);
slider_layout.pack_start(angle_slider, true, true, 0);
Gtk.Box button_layout = new Gtk.Box(Gtk.Orientation.HORIZONTAL, CONTROL_SPACING);
cancel_button.set_size_request(MIN_BUTTON_SIZE, -1);
reset_button.set_size_request(MIN_BUTTON_SIZE, -1);
ok_button.set_size_request(MIN_BUTTON_SIZE, -1);
button_layout.pack_start(cancel_button, true, true, 0);
button_layout.pack_start(reset_button, true, true, 0);
button_layout.pack_start(ok_button, true, true, 0);
Gtk.Box main_layout = new Gtk.Box(Gtk.Orientation.HORIZONTAL, 0);
main_layout.pack_start(description_label, true, true, 0);
main_layout.pack_start(slider_layout, true, true, 0);
main_layout.pack_start(angle_label, true, true, 0);
main_layout.pack_start(button_layout, true, true, 0);
add(main_layout);
reset_button.clicked.connect(on_reset_clicked);
set_position(Gtk.WindowPosition.CENTER_ON_PARENT);
}
private void on_reset_clicked() {
angle_slider.set_value(0.0);
}
}
private StraightenToolWindow window;
// the incoming image itself.
private Cairo.Surface photo_surf;
Dimensions image_dims;
// temporary surface we'll draw the rotated image into.
private Cairo.Surface rotate_surf;
private Cairo.Context rotate_ctx;
private Dimensions last_viewport;
private int view_width;
private int view_height;
private double photo_angle = 0.0;
// should we use a nicer-but-more-expensive filter
// when repainting the rotated image?
private bool use_high_qual = true;
private OneShotScheduler? slider_sched = null;
private Gdk.Point crop_center; // original center in image coordinates
private int crop_width;
private int crop_height;
private StraightenGuide guide = new StraightenGuide();
// As the crop box rotates, we adjust its center and/or scale it so that it fits in the image.
private Gdk.Point rotated_center; // in image coordinates
private double rotate_scale; // always <= 1.0: rotation may shrink but not grow box
private double preview_scale;
private StraightenTool() {
base("StraightenTool");
}
public static StraightenTool factory() {
return new StraightenTool();
}
public static bool is_available(Photo photo, Scaling scaling) {
return true;
}
/**
* @brief Signal handler for when the 'OK' button has been clicked. Computes where a previously-
* set crop region should have rotated to (to match the Photo's straightening angle).
*
* @note After this has been called against a Photo, it will always have a crop region; in the
* case of a previously-uncropped Photo, the crop region will be set to the original dimensions
* of the photo and centered at the Photo's center.
*/
private void on_ok_clicked() {
assert(canvas.get_photo() != null);
// compute where the crop box should be now and set the image's
// current crop to it
double slider_val = window.angle_slider.get_value();
Gdk.Point new_crop_center = rotate_point_arb(rotated_center,
image_dims.width, image_dims.height, slider_val);
StraightenCommand command = new StraightenCommand(
canvas.get_photo(), slider_val,
Box.from_center(new_crop_center,
(int) (rotate_scale * crop_width), (int) (rotate_scale * crop_height)),
Resources.STRAIGHTEN_LABEL, Resources.STRAIGHTEN_TOOLTIP);
applied(command, null, image_dims, true);
}
private void high_qual_repaint(){
use_high_qual = true;
update_rotated_surface();
this.canvas.repaint();
}
private void on_slider_stopped_delayed() {
high_qual_repaint();
}
public override void on_left_click(int x, int y) {
guide.reset(x, y, photo_angle);
}
public override void on_left_released(int x, int y) {
guide.update(x, y);
double? a = guide.get_angle();
guide.clear();
if (a != null) {
window.angle_slider.set_value(a);
high_qual_repaint();
}
}
public override void on_motion(int x, int y, Gdk.ModifierType mask) {
if (guide.update(x, y))
canvas.repaint();
}
public override bool on_keypress(Gdk.EventKey event) {
if ((Gdk.keyval_name(event.keyval) == "KP_Enter") ||
(Gdk.keyval_name(event.keyval) == "Enter") ||
(Gdk.keyval_name(event.keyval) == "Return")) {
on_ok_clicked();
return true;
}
if (Gdk.keyval_name(event.keyval) == "Escape") {
notify_cancel();
return true;
}
return base.on_keypress(event);
}
private void prepare_image() {
Dimensions canvas_dims = canvas.get_surface_dim();
Dimensions viewport = canvas_dims.with_max(TEMP_PIXBUF_SIZE, TEMP_PIXBUF_SIZE);
if (viewport == last_viewport)
return; // no change
last_viewport = viewport;
Gdk.Pixbuf low_res_tmp = null;
try {
low_res_tmp =
canvas.get_photo().get_pixbuf_with_options(Scaling.for_viewport(viewport, false),
Photo.Exception.STRAIGHTEN | Photo.Exception.CROP);
} catch (Error e) {
warning("A pixbuf for %s couldn't be fetched.", canvas.get_photo().to_string());
low_res_tmp = new Gdk.Pixbuf(Gdk.Colorspace.RGB, false, 8, 1, 1);
}
preview_scale = low_res_tmp.width / (double) image_dims.width;
// copy image data from photo into a cairo surface.
photo_surf = new Cairo.ImageSurface(Cairo.Format.ARGB32, low_res_tmp.width, low_res_tmp.height);
Cairo.Context ctx = new Cairo.Context(photo_surf);
Gdk.cairo_set_source_pixbuf(ctx, low_res_tmp, 0, 0);
ctx.rectangle(0, 0, low_res_tmp.width, low_res_tmp.height);
ctx.fill();
ctx.paint();
// prepare rotation surface and context. we paint a rotated,
// low-res copy of the image into it, followed by a faint grid.
view_width = (int) (crop_width * preview_scale);
view_height = (int) (crop_height * preview_scale);
rotate_surf = new Cairo.ImageSurface(Cairo.Format.ARGB32, view_width, view_height);
rotate_ctx = new Cairo.Context(rotate_surf);
}
// Adjust the rotated crop box so that it fits in the source image.
void adjust_for_rotation() {
double width, height;
compute_arb_rotated_size(crop_width, crop_height, photo_angle, out width, out height);
// First compute a scaling factor that will let the rotated box fit in the image.
rotate_scale = double.min(image_dims.width / width, image_dims.height / height);
rotate_scale = double.min(rotate_scale, 1.0);
// Now nudge the box into the image if necessary.
rotated_center = crop_center;
int radius_x = (int) (rotate_scale * width / 2);
int radius_y = (int) (rotate_scale * height / 2);
rotated_center.x = rotated_center.x.clamp(radius_x, image_dims.width - radius_x);
rotated_center.y = rotated_center.y.clamp(radius_y, image_dims.height - radius_y);
}
/**
* @brief Spawn the tool window, set up the scratch surfaces and prepare the straightening
* tool for use. If a valid pixbuf of the incoming Photo can't be loaded for any
* reason, the tool will use a 1x1 temporary image instead to avoid crashing.
*
* @param canvas The PhotoCanvas the tool's output should be painted to.
*/
public override void activate(PhotoCanvas canvas) {
base.activate(canvas);
this.canvas = canvas;
bind_canvas_handlers(this.canvas);
image_dims = canvas.get_photo().get_dimensions(
Photo.Exception.STRAIGHTEN | Photo.Exception.CROP);
Box crop_region;
if (!canvas.get_photo().get_crop(out crop_region)) {
crop_region.left = 0;
crop_region.right = image_dims.width;
crop_region.top = 0;
crop_region.bottom = image_dims.height;
}
// read the photo's current angle and start the tool with the slider set to that value. we
// also use this to de-rotate the crop region
double incoming_angle = 0.0;
canvas.get_photo().get_straighten(out incoming_angle);
// Translate the crop center to image coordinates.
crop_center = derotate_point_arb(crop_region.get_center(),
image_dims.width, image_dims.height, incoming_angle);
crop_width = crop_region.get_width();
crop_height = crop_region.get_height();
adjust_for_rotation();
prepare_image();
// set crosshair cursor
canvas.get_drawing_window().set_cursor(new Gdk.Cursor(Gdk.CursorType.CROSSHAIR));
window = new StraightenToolWindow(canvas.get_container());
bind_window_handlers();
// prepare ths slider for display
window.angle_slider.set_value(incoming_angle);
photo_angle = incoming_angle;
string tmp = "%2.1f°".printf(incoming_angle);
window.angle_label.set_text(tmp);
high_qual_repaint();
window.show_all();
}
/**
* Tears down the tool window and frees resources.
*/
public override void deactivate() {
if(window != null) {
unbind_window_handlers();
window.hide();
window = null;
}
if (canvas != null) {
unbind_canvas_handlers(canvas);
canvas.get_drawing_window().set_cursor(null);
}
base.deactivate();
}
private void bind_canvas_handlers(PhotoCanvas canvas) {
canvas.resized_scaled_pixbuf.connect(on_resized_pixbuf);
}
private void unbind_canvas_handlers(PhotoCanvas canvas) {
canvas.resized_scaled_pixbuf.disconnect(on_resized_pixbuf);
}
private void bind_window_handlers() {
window.key_press_event.connect(on_keypress);
window.ok_button.clicked.connect(on_ok_clicked);
window.cancel_button.clicked.connect(notify_cancel);
window.angle_slider.value_changed.connect(on_angle_changed);
}
private void unbind_window_handlers() {
window.key_press_event.disconnect(on_keypress);
window.ok_button.clicked.disconnect(on_ok_clicked);
window.cancel_button.clicked.disconnect(notify_cancel);
window.angle_slider.value_changed.disconnect(on_angle_changed);
}
private void on_angle_changed() {
photo_angle = window.angle_slider.get_value();
string tmp = "%2.1f°".printf(window.angle_slider.get_value());
window.angle_label.set_text(tmp);
if (slider_sched == null)
slider_sched = new OneShotScheduler("straighten", on_slider_stopped_delayed);
slider_sched.after_timeout(REPAINT_ON_STOP_DELAY_MSEC, true);
use_high_qual = false;
adjust_for_rotation();
update_rotated_surface();
this.canvas.repaint();
}
/**
* @brief Called by the EditingHostPage when a resize event occurs.
*/
private void on_resized_pixbuf(Dimensions old_dim, Gdk.Pixbuf scaled, Gdk.Rectangle scaled_position) {
prepare_image();
}
/**
* Returns a reference to the current StraightenTool instance's tool window;
* the PhotoPage uses this to control the tool window's positioning, etc.
*/
public override EditingToolWindow? get_tool_window() {
return window;
}
/**
* Draw the rotated photo and grid.
*/
private void update_rotated_surface() {
draw_rotated_source(photo_surf, rotate_ctx, view_width, view_height, photo_angle);
rotate_ctx.set_line_width(1.0);
draw_superimposed_grid(rotate_ctx, view_width, view_height);
}
/**
* Render a smaller, rotated version of the image, with a grid superimposed over it.
*
* @param ctx The rendering context of a 'scratch' Cairo surface. The tool makes its own
* surfaces and contexts so it can have things set up exactly like it wants them, so
* it's not used.
*/
public override void paint(Cairo.Context ctx) {
int w = canvas.get_drawing_window().get_width();
int h = canvas.get_drawing_window().get_height();
// fill region behind the rotation surface with neutral color.
canvas.get_default_ctx().identity_matrix();
canvas.get_default_ctx().set_source_rgba(0.0, 0.0, 0.0, 1.0);
canvas.get_default_ctx().rectangle(0, 0, w, h);
canvas.get_default_ctx().fill();
// copy the composited result to the main window.
canvas.get_default_ctx().translate((w - view_width) / 2.0, (h - view_height) / 2.0);
canvas.get_default_ctx().set_source_surface(rotate_surf, 0, 0);
canvas.get_default_ctx().rectangle(0, 0, view_width, view_height);
canvas.get_default_ctx().fill();
canvas.get_default_ctx().paint();
// reset the 'modelview' matrix, since when the canvas is not in
// 'tool' mode, it 'expects' things to be set up a certain way.
canvas.get_default_ctx().identity_matrix();
guide.draw(canvas.get_default_ctx());
}
/**
* Copy a rotated version of the source image onto the destination
* context.
*
* @param src_surf A Cairo surface containing the source image.
* @param dest_ctx The rendering context of the destination image.
* @param src_width The width of the image data in src_surf in pixels.
* @param src_height The height of the image data in src_surf in pixels.
* @param angle The angle the source image should be rotated by, in degrees.
*/
private void draw_rotated_source(Cairo.Surface src_surf, Cairo.Context dest_ctx,
int src_width, int src_height, double angle) {
double angle_internal = degrees_to_radians(angle);
// fill area behind rotated image with neutral color to avoid 'ghosting'.
// this should be removed after #4612 has been addressed.
dest_ctx.identity_matrix();
dest_ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0);
dest_ctx.rectangle(0, 0, view_width, view_height);
dest_ctx.fill();
// rotate the image, taking into account that the position of the
// upper left corner must change depending on rotation amount and direction
// and translate so center of preview crop region is now center of rotation
dest_ctx.identity_matrix();
dest_ctx.translate(view_width / 2, view_height / 2);
dest_ctx.scale(1.0 / rotate_scale, 1.0 / rotate_scale);
dest_ctx.rotate(angle_internal);
dest_ctx.translate(- rotated_center.x * preview_scale, - rotated_center.y * preview_scale);
dest_ctx.set_source_surface(src_surf, 0, 0);
dest_ctx.get_source().set_filter(use_high_qual ? Cairo.Filter.BEST : Cairo.Filter.NEAREST);
dest_ctx.rectangle(0, 0, src_width, src_height);
dest_ctx.fill();
dest_ctx.paint();
}
/**
* Superimpose a faint grid over the supplied image.
*
* @param width The total width the grid should be drawn to.
* @param height The total height the grid should be drawn to.
* @param dest_ctx The rendering context of the destination image.
*/
private void draw_superimposed_grid(Cairo.Context dest_ctx, int width, int height) {
int half_width = width / 2;
int quarter_width = width / 4;
int half_height = height / 2;
int quarter_height = height / 4;
dest_ctx.identity_matrix();
dest_ctx.set_source_rgba(1.0, 1.0, 1.0, 1.0);
canvas.draw_horizontal_line(dest_ctx, 0, 0, width, false);
canvas.draw_horizontal_line(dest_ctx, 0, half_height, width, false);
canvas.draw_horizontal_line(dest_ctx, 0, view_height - 1, width, false);
canvas.draw_vertical_line(dest_ctx, 0, 0, height + 1, false);
canvas.draw_vertical_line(dest_ctx, half_width, 0, height + 1, false);
canvas.draw_vertical_line(dest_ctx, width - 1, 0, height + 1, false);
dest_ctx.set_source_rgba(1.0, 1.0, 1.0, 0.33);
canvas.draw_horizontal_line(dest_ctx, 0, quarter_height, width, false);
canvas.draw_horizontal_line(dest_ctx, 0, half_height + quarter_height, width, false);
canvas.draw_vertical_line(dest_ctx, quarter_width, 0, height, false);
canvas.draw_vertical_line(dest_ctx, half_width + quarter_width, 0, height, false);
}
}
} // end namespace
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