[gthumb] cairo rotate: allow to interrupt the rotation

[Paolo Bacchilega <paobac src gnome org>]

commit c665d884fdee9a0fa1b84bd16ac776ea2ddf342d
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Tue Sep 24 23:07:04 2013 +0200

    cairo rotate: allow to interrupt the rotation

 extensions/file_tools/cairo-rotate.c |   23 ++++++++++++++++++++---
 extensions/file_tools/cairo-rotate.h |    3 ++-
 2 files changed, 22 insertions(+), 4 deletions(-)
---
diff --git a/extensions/file_tools/cairo-rotate.c b/extensions/file_tools/cairo-rotate.c
index 7fcfc6e..657a586 100644
--- a/extensions/file_tools/cairo-rotate.c
+++ b/extensions/file_tools/cairo-rotate.c
@@ -173,7 +173,8 @@ rotate (cairo_surface_t *image,
        guchar           r0,
        guchar           g0,
        guchar           b0,
-       guchar           a0)
+       guchar           a0,
+       GthAsyncTask    *task)
 {
        cairo_surface_t *image_with_background;
        cairo_surface_t *rotated;
@@ -295,6 +296,18 @@ rotate (cairo_surface_t *image,
 
        y = - half_new_height;
        for (yi = 0; yi < new_height; yi++) {
+               if (task != NULL) {
+                       gboolean cancelled;
+                       double   progress;
+
+                       gth_async_task_get_data (task, NULL, &cancelled, NULL);
+                       if (cancelled)
+                               goto out;
+
+                       progress = (double) yi / new_height;
+                       gth_async_task_set_data (task, NULL, NULL, &progress);
+               }
+
                p_new2 = p_new;
 
                x = - half_new_width;
@@ -348,6 +361,8 @@ rotate (cairo_surface_t *image,
                y += 1.0;
        }
 
+       out:
+
        cairo_surface_mark_dirty (rotated);
        cairo_surface_destroy (image_with_background);
 
@@ -362,7 +377,8 @@ cairo_surface_t *
 _cairo_image_surface_rotate (cairo_surface_t *image,
                             double           angle,
                             gboolean         high_quality,
-                            GdkRGBA         *background_color)
+                            GdkRGBA         *background_color,
+                            GthAsyncTask    *task)
 {
        cairo_surface_t *rotated;
        cairo_surface_t *tmp = NULL;
@@ -383,7 +399,8 @@ _cairo_image_surface_rotate (cairo_surface_t *image,
                                  background_color->red * 255.0,
                                  background_color->green * 255.0,
                                  background_color->blue * 255.0,
-                                 background_color->alpha * 255.0);
+                                 background_color->alpha * 255.0,
+                                 task);
        else
                rotated = cairo_surface_reference (image);
 
diff --git a/extensions/file_tools/cairo-rotate.h b/extensions/file_tools/cairo-rotate.h
index 2ebc1cb..d1a539f 100644
--- a/extensions/file_tools/cairo-rotate.h
+++ b/extensions/file_tools/cairo-rotate.h
@@ -43,7 +43,8 @@ double             _cairo_image_surface_rotate_get_align_angle         (gboolean
 cairo_surface_t *  _cairo_image_surface_rotate                         (cairo_surface_t       *image,
                                                                        double                 angle,
                                                                        gboolean               high_quality,
-                                                                       GdkRGBA               
*background_color);
+                                                                       GdkRGBA               
*background_color,
+                                                                       GthAsyncTask          *task);
 
 G_END_DECLS