Author: post
Date: 2010-12-29 04:13:56 +0100 (Wed, 29 Dec 2010)
New Revision: 3707
Modified:
trunk/src/rs-photo.c
trunk/src/rs-photo.h
Log:
Add functions to get unrotated coordinates.
Modified: trunk/src/rs-photo.c
===================================================================
--- trunk/src/rs-photo.c 2010-12-28 23:16:52 UTC (rev 3706)
+++ trunk/src/rs-photo.c 2010-12-29 03:13:56 UTC (rev 3707)
@@ -778,3 +778,39 @@
rs_metadata_cache_save(photo->metadata, photo->filename);
}
}
+
+void
+rs_photo_rotate_rect_inverse(RS_PHOTO *photo, RS_RECT *coords)
+{
+ RS_MATRIX3 affine;
+ gdouble minx, miny;
+ gdouble maxx, maxy;
+
+ g_assert(RS_IS_PHOTO(photo));
+ g_assert(photo->input);
+
+ /* Start clean */
+ matrix3_identity(&affine);
+
+ /* Rotate + orientation-angle */
+ matrix3_affine_rotate(&affine,
photo->angle+(photo->orientation&3)*90.0);
+
+ /* Flip if needed */
+ if (photo->orientation&4)
+ matrix3_affine_scale(&affine, 1.0, -1.0);
+
+ /* We use the inverse matrix for our transform */
+ matrix3_affine_invert(&affine);
+
+ /* Translate points */
+ matrix3_affine_get_minmax(&affine, &minx, &miny, &maxx, &maxy, 0.0,
0.0, (gdouble) (photo->input->w-1), (gdouble) (photo->input->h-1));
+ minx -= 0.5; /* This SHOULD be the correct rounding :) */
+ miny -= 0.5;
+ matrix3_affine_translate(&affine, -minx, -miny);
+ matrix3_affine_get_minmax(&affine, &minx, &miny, &maxx, &maxy,
coords->x1, coords->y1, coords->x2, coords->y2);
+
+ coords->x1 = minx;
+ coords->y1 = miny;
+ coords->x2 = maxx;
+ coords->y2 = maxy;
+}
Modified: trunk/src/rs-photo.h
===================================================================
--- trunk/src/rs-photo.h 2010-12-28 23:16:52 UTC (rev 3706)
+++ trunk/src/rs-photo.h 2010-12-29 03:13:56 UTC (rev 3707)
@@ -332,4 +332,7 @@
extern gboolean
rs_photo_get_original_size(RS_PHOTO *photo, gboolean rotated, gint* width,
gint* height);
+extern void
+rs_photo_rotate_rect_inverse(RS_PHOTO *photo, RS_RECT *coords);
+
#endif /* RS_PHOTO_H */
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