Implement cygw32

Here, we use the generic window-system configuration system we just
implemented to support the w32 window-system in the mainline build
under Cygwin.  (Previously, the w32 window system could only be
compiled as part of the NT-native Emacs build process.)

The changes in this patch need to be applied atomically in order to
avoid breaking Emacs.  The changes include:

  - Changes throughout the Lisp and C code to not assume that
      NT Emacs and the w32 window system are synonymous.

  - Wiring up the regular select(2) event loop to Windows messages

  - Cleaning up the w32 drag-and-drop receiving code.

  - Exposing Cygwin path conversion functions to elisp.

  - Unicode file dialog support when compiling for Cygwin.

  - Splitting the w32 term lisp initialization code into code
    applicable to any w32 window-system and code specific to
    system-type windows-nt.

  - Integrating the old and new w32 code into the build system.

1 files changed, 40 insertions, 22 deletions

diff --git a/src/image.c b/src/image.c
index d4e78d41000..b5a2e0328eb 100644
--- a/src/image.c
+++ b/src/image.c
@@ -76,7 +76,11 @@ typedef struct x_bitmap_record Bitmap_Record;
 #endif /* HAVE_X_WINDOWS */
 
 #ifdef HAVE_NTGUI
-#include "w32.h"
+# ifdef WINDOWSNT
+/* We only need (or want) w32.h when we're _not_
+ * compiling for Cygwin */
+# include "w32.h"
+# endif /* WINDOWSNT */
 /* W32_TODO : Color tables on W32.  */
 #undef COLOR_TABLE_SUPPORT
 
@@ -569,13 +573,14 @@ static void x_laplace (struct frame *, struct image *);
 static void x_emboss (struct frame *, struct image *);
 static int x_build_heuristic_mask (struct frame *, struct image *,
                                    Lisp_Object);
-#ifdef HAVE_NTGUI
-extern Lisp_Object Vlibrary_cache, QCloaded_from;
+#ifdef WINDOWSNT
+extern Lisp_Object Vlibrary_cache;
+
 #define CACHE_IMAGE_TYPE(type, status) \
   do { Vlibrary_cache = Fcons (Fcons (type, status), Vlibrary_cache); } while (0)
 #else
 #define CACHE_IMAGE_TYPE(type, status)
-#endif
+#endif /* WINDOWSNT */
 
 #define ADD_IMAGE_TYPE(type) \
   do { Vimage_types = Fcons (type, Vimage_types); } while (0)
@@ -1861,7 +1866,7 @@ mark_image_cache (struct image_cache *c)
                           X / NS / W32 support code
  ***********************************************************************/
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* Macro for defining functions that will be loaded from image DLLs.  */
 #define DEF_IMGLIB_FN(rettype,func,args) static rettype (FAR CDECL *fn_##func)args
@@ -1872,7 +1877,7 @@ mark_image_cache (struct image_cache *c)
     if (!fn_##func) return 0;                                           \
   }
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 static int x_create_x_image_and_pixmap (struct frame *, int, int, int,
                                         XImagePtr *, Pixmap *);
@@ -2935,7 +2940,7 @@ xbm_load (struct frame *f, struct image *img)
           else
             bits = (char *) XBOOL_VECTOR (data)->data;
 
-#ifdef WINDOWSNT
+#ifdef HAVE_NTGUI
           {
             char *invertedBits;
             int nbytes, i;
@@ -3243,7 +3248,7 @@ xpm_free_colors (Display *dpy, Colormap cmap, Pixel *pixels, int npixels, void *
 #endif /* ALLOC_XPM_COLORS */
 
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* XPM library details.  */
 
@@ -3269,8 +3274,15 @@ init_xpm_functions (Lisp_Object libraries)
   return 1;
 }
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
+#ifdef HAVE_NTGUI
+/* Glue for code below */
+#define fn_XpmReadFileToImage XpmReadFileToImage
+#define fn_XpmCreateImageFromBuffer XpmCreateImageFromBuffer
+#define fn_XImageFree XImageFree
+#define fn_XpmFreeAttributes XpmFreeAttributes
+#endif /* HAVE_NTGUI */
 
 /* Value is non-zero if COLOR_SYMBOLS is a valid color symbols list
    for XPM images.  Such a list must consist of conses whose car and
@@ -5414,7 +5426,7 @@ png_image_p (Lisp_Object object)
 
 #ifdef HAVE_PNG
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 /* PNG library details.  */
 
 DEF_IMGLIB_FN (png_voidp, png_get_io_ptr, (png_structp));
@@ -5514,7 +5526,7 @@ init_png_functions (Lisp_Object libraries)
 #define fn_png_set_longjmp_fn           png_set_longjmp_fn
 #endif /* libpng version >= 1.5 */
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 
 #if (PNG_LIBPNG_VER < 10500)
@@ -6045,14 +6057,20 @@ jpeg_image_p (Lisp_Object object)
 #define __WIN32__ 1
 #endif
 
+/* Work around conflict between jpeg boolean and rpcndr.h
+   under Windows. */
+#define boolean jpeg_boolean
 #include <jpeglib.h>
 #include <jerror.h>
 
+/* Don't undefine boolean --- use the JPEG boolean
+   through the rest of the file. */
+
 #ifdef HAVE_STLIB_H_1
 #define HAVE_STDLIB_H 1
 #endif
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* JPEG library details.  */
 DEF_IMGLIB_FN (void, jpeg_CreateDecompress, (j_decompress_ptr, int, size_t));
@@ -6102,7 +6120,7 @@ jpeg_resync_to_restart_wrapper (j_decompress_ptr cinfo, int desired)
 #define fn_jpeg_std_error               jpeg_std_error
 #define jpeg_resync_to_restart_wrapper  jpeg_resync_to_restart
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 struct my_jpeg_error_mgr
 {
@@ -6583,7 +6601,7 @@ tiff_image_p (Lisp_Object object)
 
 #include <tiffio.h>
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* TIFF library details.  */
 DEF_IMGLIB_FN (TIFFErrorHandler, TIFFSetErrorHandler, (TIFFErrorHandler));
@@ -6627,7 +6645,7 @@ init_tiff_functions (Lisp_Object libraries)
 #define fn_TIFFReadRGBAImage            TIFFReadRGBAImage
 #define fn_TIFFClose                    TIFFClose
 #define fn_TIFFSetDirectory             TIFFSetDirectory
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 
 /* Reading from a memory buffer for TIFF images Based on the PNG
@@ -7056,7 +7074,7 @@ gif_image_p (Lisp_Object object)
 #endif /* HAVE_NTGUI */
 
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* GIF library details.  */
 DEF_IMGLIB_FN (int, DGifCloseFile, (GifFileType *));
@@ -7086,7 +7104,7 @@ init_gif_functions (Lisp_Object libraries)
 #define fn_DGifOpen             DGifOpen
 #define fn_DGifOpenFileName     DGifOpenFileName
 
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 /* Reading a GIF image from memory
    Based on the PNG memory stuff to a certain extent. */
@@ -8075,7 +8093,7 @@ svg_image_p (Lisp_Object object)
 
 #include <librsvg/rsvg.h>
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 
 /* SVG library functions.  */
 DEF_IMGLIB_FN (RsvgHandle *, rsvg_handle_new);
@@ -8153,7 +8171,7 @@ init_svg_functions (Lisp_Object libraries)
 #define fn_g_type_init                    g_type_init
 #define fn_g_object_unref                 g_object_unref
 #define fn_g_error_free                   g_error_free
-#endif /* !HAVE_NTGUI  */
+#endif /* !WINDOWSNT  */
 
 /* Load SVG image IMG for use on frame F.  Value is non-zero if
    successful. this function will go into the svg_type structure, and
@@ -8701,7 +8719,7 @@ DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0, "")
                             Initialization
  ***********************************************************************/
 
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
 /* Image types that rely on external libraries are loaded dynamically
    if the library is available.  */
 #define CHECK_LIB_AVAILABLE(image_type, init_lib_fn, libraries) \
@@ -8709,7 +8727,7 @@ DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0, "")
 #else
 #define CHECK_LIB_AVAILABLE(image_type, init_lib_fn, libraries) \
   define_image_type (image_type, 1)
-#endif /* HAVE_NTGUI */
+#endif /* WINDOWSNT */
 
 DEFUN ("init-image-library", Finit_image_library, Sinit_image_library, 2, 2, 0,
        doc: /* Initialize image library implementing image type TYPE.
@@ -8720,7 +8738,7 @@ Libraries to load are specified in alist LIBRARIES (usually, the value
 of `dynamic-library-alist', which see).  */)
   (Lisp_Object type, Lisp_Object libraries)
 {
-#ifdef HAVE_NTGUI
+#ifdef WINDOWSNT
   /* Don't try to reload the library.  */
   Lisp_Object tested = Fassq (type, Vlibrary_cache);
   if (CONSP (tested))