* test/manual/image-transforms-tests.el: Replace hard-coded colors
with defaults.
* src/dispextern.h (struct image):
* src/image.c (search_image_cache):
(xbm_load_image):
(xbm_load):
(pbm_load): Rename from frame to face where relevant.
(svg_load_image): Parse the image to find out the size, then wrap it
in another SVG to set a new size and colors, etc.
(lookup_image): Use the face colors instead of the frame colors.
(search_image_cache): Add ability to ignore the face colors.
(uncache_image): Uncache all copies of the image that share the spec,
even if the face colors don't match.
* etc/NEWS: Describe the changes.
This changeset also rearranges native image transform code
for other platforms to make it cleaner, and also removes
the support for native cropping. For the discussions, see
https://lists.gnu.org/archive/html/emacs-devel/2019-06/msg00242.html
* src/w32term.c (w32_image_rotations_p, transform): New functions.
(w32_draw_image_foreground): If image rotation is requested
and supported, call PlgBlt to transform the image.
(w32_initialize): Populate the PlgBlt function pointer if it
is supported.
* src/w32term.h (w32_image_rotations_p): Add prototype.
* src/dispextern.h (struct image) [HAVE_NTGUI]: New member xform.
* src/image.c (compute_image_rotation): Renamed from
image_set_rotation. Only compute and returns the rotation
angle; leave the matrix calculation for later. Log an error
message if the :rotation parameter is not a number.
(image_set_crop): Function deleted. We no longer support
native cropping, as one can display an image slice instead.
(image_set_transform): Compute the transform matrix in its
entirety here, in two variants: one for XRender and Cairo, the
other for NS and MS-Windows. call compute_image_size and
compute_image_rotation internally.
(lookup_image) [HAVE_NATIVE_TRANSFORMS]: Call only
image_set_transform. No need to pass the transform matrix to
image_set_transform.
(Fimage_transforms_p): Return a list of transform capabilities
rather than a simple boolean. Support TTY frames as well.
* src/nsimage.m (setTransform:): Don't invert the matrix, as
it is already inverted in image.c.
* test/manual/image-transforms-tests.el (test-cropping): State
in the text that only ImageMagick supports cropping.
* doc/lispref/display.texi (Image Descriptors): Update the
documentation of native image transforms.
(ImageMagick Images): Move the description of ':crop' here.
* etc/NEWS: Minor copyedits of the feature announcement.
