Add native image rotation and cropping

* lisp/image.el (image--get-imagemagick-and-warn): Only fallback to
ImageMagick if native transforms aren't available.
* src/dispextern.h (INIT_MATRIX, COPY_MATRIX, MULT_MATRICES): New
macros for matrix manipulation.
(HAVE_NATIVE_SCALING, HAVE_NATIVE_TRANSFORMS): Rename and change all
relevant locations.
* src/image.c (x_set_image_rotation):
(x_set_transform): New functions.
(x_set_image_size): Use transform matrix for resizing under X and NS.
(x_set_image_crop): New function.
(lookup_image): Use the new transform functions.
(Fimage_scaling_p, Fimage_transforms_p): Rename and update all
callers.
* src/nsimage.m (ns_load_image): Remove rotation code.
(ns_image_set_transform): New function.
([EmacsImage dealloc]): Release the saved transform.
([EmacsImage rotate:]): Remove unneeded method.
([EmacsImage setTransform:]): New method.
* src/nsterm.h (EmacsImage): Add transform property and update method
definitions.
* src/nsterm.m (ns_dumpglyphs_image): Use the transform to draw the
image correctly.
* src/xterm.c (x_composite_image): Use PictOpSrc as we don't care
about alpha values here.
* doc/lispref/display.texi (Image Descriptors): Add :rotation.
(ImageMagick Images): Remove :rotation.

1 files changed, 3 insertions, 3 deletions

diff --git a/etc/NEWS b/etc/NEWS
index d1239523abd..e47c30565f8 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2051,14 +2051,14 @@ 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 (scaling) of images without ImageMagick.
+** Emacs now supports resizing and rotating images without ImageMagick.
 All modern systems are supported by this feature.  (On GNU and Unix
 systems, Cairo drawing or 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.
+The new function 'image-transforms-p' can be used to test whether any
+given frame supports this capability.
 
 +++
 ** '(locale-info 'paper)' now returns the paper size on systems that support it.