1 This is the imagemagick branch of Emacs. Imagemagick can now be used
2 to load many new image formats, and also do useful transforms like
5 This file will attempt to contain draft NEWS, Changelog and manual
6 entries for the new functionality.
8 You might need to regenerate the configure scripts:
13 ./configure --with-imagemagick
18 - image-type-header-regexps priorities the jpeg loader over the
19 imagemagick one. This is not wrong, but how should a user go about
20 prefering the imagemagick loader? The user might like zooming etc in
23 - For some reason its unbearably slow to look at a page in a large
24 image bundle using the :index feature. The imagemagick "display"
25 command is also a bit slow, but nowhere near as slow as the emacs
26 code. It seems imagemagick tries to unpack every page when loading
27 the bundle. This feature is not the primary usecase for the
28 imagemagick patch though.
30 ImageMagick 6.6.2-8 introduced a bugfix for single page djvu load.
31 To benefit from the bugfix, the loader code in image.c must be changed.
33 - optimize number of pages calculation for bundles as suggested by
34 imagemagick forum: "set the density to something low like 2 and use
37 - zooming the image like what is done for fonts in face-remap.el would
38 be a useful and demo friendly addition. Some work has been done on
39 image-mode.el to acihieve this.
41 - look for optimizations for handling images with low depth
43 - it would be neat if the graphicsmagick fork of imagemagick could
49 #B _ complete documentation drafts below
51 #B X fix inconsistencys with spelling of imagemagick in the src
52 #B X report number of images in image bundle types somehow
53 Works like for "gif" support. Thanks to Juri Linkov.
54 #B X probably add pdf to inhibited types
55 #B X inhibit types is defconst should probably be defcustom
56 #B _ decide what to do with some uncommitted imagemagick support
57 functions for image size etc.
58 #B _ Test with more systems
59 Tested on Fedora 12 so far, and the libmagick that ships with it.
60 Ubuntu 8.04 was also tested, but it seems it ships a broken ImageMagick.
61 #B X Also need some way to handle render methods that only work on newer ImageMagicks
62 Is handled by configure now
64 * Some nits from Stefan Monnier
65 I just took a quick look at the code and I see the following nits to fix:
66 #B _ obviously a merge will have to come with a good ChangeLog.
67 #B X also the merge will need to come with documentation. Maybe not in the
68 Texinfo form yet, but at least in the etc/NEWS with enough info that
69 describes the `scale' and other such arguments that someone can start
71 #B X the README talks about naming inconsistencies, I think these should be
72 fixed before a first commit (should be straightforward).
74 #B X the "let" in image.el should not be followed by a line break and the while
75 should be replaced by a dolist.
77 #B X the prototype of imagemagick_load_image has some odd indentation in ([[2010.06.14]])
78 its args, not sure what happened.
79 #B X a few lines in the C code break the 80columns limit.
80 #B X please use ANSI style function declarations rather than K&R for new code. ([[2010.06.14]])
81 #B X you can get rid of the prototypes by reordering the code. ([[2010.06.14]])
82 #B X the docstrings in DEFUN should not be indented (they'll display ([[2010.06.14]])
83 weirdly otherwise in C-h f).
84 #B X Some "{" are at the end of a for/if rather than on their own line. ([[2010.06.14]])
85 #B X why use "*( imtypes + i)" rather than "imtypes[i]"? ([[2010.06.14]])
86 #B X some "," lack a space after them. ([[2010.06.14]])
87 #B X several "=" and "==" lack spaces around them. ([[2010.06.14]])
91 ** ImageMagick support
92 It is now possible to use the Imagemagick library to load many new
93 image formats in Emacs.
95 To enable, use the following configure option:
98 The new function (imagemagick-types) returns a list of image file
99 extensions that your installation of imagemagick supports.
101 The function (imagemagick-register-types) will enable the imagemagick
102 support for the extensions in imagemagick-types minus the types listed
103 in imagemagick-types-inhibit.
105 imagemagick-types-inhibit has the value '(C HTML HTM TXT PDF) by default.
106 This means imagemagick will be used also to load jpeg files, if you
107 have both jpeg and imagemagick libraries linked. Add 'JPG to
108 imagemagick-types-inhibit if you do not want this.
110 imagemagick-render-type is a new variable which can be set to choose
111 between screen render methods.
113 - 0 is a conservative metod which works with older ImageMagick
114 versions. It is a bit slow, but robust.
116 - 1 utilizes a newer ImageMagick method
119 Images loaded with imagemagick will support a couple of new display
120 specification behaviours:
122 - if the :width and :height keywords are specified, these values are
123 used for scaling the image. If only one of :width or :height is
124 specified, the other one will be calculated so as to preserve the
125 aspect ratio.If both :width and :height are specified, aspect ratio
126 will not be preserved.
128 - :rotation specifies a rotation angle in degrees.
130 - :index specifies which image inside an image bundle file format, such
131 as TIFF or DJVM, to view.
133 The image-metadata function can be used to retrieve the total number
134 of images in an image bundle. This is simmilar to how GIF files work.
137 2010-06-12 Joakim Verona <joakim@verona.se>
138 * image.c: Add support for ImageMagick. When HAVE_IMAGEMAGICK is
140 (imagemagick_image_p): New function to test for ImageMagic img.
141 (imagemagick_load): New function to load ImageMagick img.
142 (imagemagick_load_image): New function, helper for imagemagick_load
143 (imagemagick-types): New function.
144 (Qimagemagick): New Lisp_object.
146 (imagemagick-types-inhibit): New var.
147 (imagemagick-register-types): New function.
148 * config.in, Makefile.in, configure.in
151 nothing yet, but the NEWS entry could be adapted.