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https://gitlab.freedesktop.org/cairo/cairo.git
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aa65e756d4
XCreateWindow dies if asked to create a 0x0 window, so don't and use a 1x1 pixel window for a zero-sized surface.
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
#include <cairo.h>
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#include <cairo-script-interpreter.h>
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#include <stdio.h>
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#include <stdlib.h>
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static const cairo_user_data_key_t _key;
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#if CAIRO_HAS_XLIB_XRENDER_SURFACE
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#include <cairo-xlib.h>
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#include <cairo-xlib-xrender.h>
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static Display *
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_get_display (void)
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{
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static Display *dpy;
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if (dpy != NULL)
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return dpy;
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dpy = XOpenDisplay (NULL);
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if (dpy == NULL) {
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fprintf (stderr, "Failed to open display.\n");
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exit (1);
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}
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return dpy;
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}
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static void
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_destroy_window (void *closure)
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{
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XFlush (_get_display ());
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XDestroyWindow (_get_display(), (Window) closure);
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}
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static cairo_surface_t *
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_surface_create (void *closure,
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double width, double height)
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{
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Display *dpy;
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Visual *visual;
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XRenderPictFormat *xrender_format;
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XSetWindowAttributes attr;
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Window w;
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cairo_surface_t *surface;
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dpy = _get_display ();
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visual = DefaultVisual (dpy, DefaultScreen (dpy));
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xrender_format = XRenderFindVisualFormat (dpy, visual);
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if (xrender_format == NULL) {
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fprintf (stderr, "X server does not have the Render extension.\n");
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exit (1);
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}
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attr.override_redirect = True;
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w = XCreateWindow (dpy, DefaultRootWindow (dpy), 0, 0,
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width <= 0 ? 1 : width,
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height <= 0 ? 1 : height,
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0, xrender_format->depth,
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InputOutput, visual, CWOverrideRedirect, &attr);
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XMapWindow (dpy, w);
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surface = cairo_xlib_surface_create_with_xrender_format (dpy, w,
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DefaultScreenOfDisplay (dpy),
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xrender_format,
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width, height);
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cairo_surface_set_user_data (surface, &_key, (void *) w, _destroy_window);
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return surface;
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}
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#else
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/* fallback: just use an image surface */
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static cairo_surface_t *
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_surface_create (void *closure,
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double width, double height)
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{
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return cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
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}
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#endif
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int
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main (int argc, char **argv)
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{
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cairo_script_interpreter_t *csi;
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const cairo_script_interpreter_hooks_t hooks = {
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.surface_create = _surface_create
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};
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int i;
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csi = cairo_script_interpreter_create ();
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cairo_script_interpreter_install_hooks (csi, &hooks);
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for (i = 1; i < argc; i++)
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cairo_script_interpreter_run (csi, argv[i]);
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return cairo_script_interpreter_destroy (csi);
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}
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