Support native image resizing on MS-Windows

* src/w32term.c (x_draw_image_foreground): Scale the image if
the requested dimensions are different from the bitmap
dimensions.
* src/image.c (Fimage_scaling_p): Return t when HAVE_NTGUI.
(x_set_image_size) [HAVE_NTGUI]: Record the scaled dimensions
in the image struct.
* src/dispextern.h (HAVE_NATIVE_SCALING): Define when
HAVE_NTGUI as well.

* etc/NEWS: Update the announcement of native image scaling.

1 files changed, 6 insertions, 2 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 9d91a30a583..21187474a28 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1505,8 +1505,12 @@ buffer's 'default-directory' and invoke that file name handler to make
 the process.  That way 'make-process' can start remote processes.
 
 +++
-** Emacs now supports resizing images without ImageMagick on X window
-systems where the XRender extension is available, and on the NS port.
+** Emacs now supports resizing (scaling) of images without ImageMagick.
+All modern systems are supported by this feature.  (On GNU and Unix
+systems, the XRender extension to X11 is required for this to be
+available; the configure script will test for it and, if found, enable
+scaling.)
+
 The new function 'image-scaling-p' can be used to test whether any
 given frame supports resizing.