diff options
Diffstat (limited to 'xshm.c')
| -rw-r--r-- | xshm.c | 200 |
1 files changed, 200 insertions, 0 deletions
@@ -0,0 +1,200 @@ +#include <cairo-xlib.h> + +#include "demo.h" + +#include <stdlib.h> +#include <stdio.h> + +#include <X11/extensions/XShm.h> +#include <sys/ipc.h> +#include <sys/shm.h> + +struct xshm_device { + struct device base; + struct framebuffer fb; + + Display *display; + Window drawable; + + int stride; + Pixmap pixmap; + GC gc; + XShmSegmentInfo shm; +}; + +static void +destroy (struct framebuffer *abstract_framebuffer) +{ +} + +static cairo_bool_t +_native_byte_order_lsb (void) +{ + int x = 1; + + return *((char *) &x) == 1; +} + +static void +show (struct framebuffer *fb) +{ + struct xshm_device *device = (struct xshm_device *) fb->device; + + if (device->pixmap) { + XCopyArea (device->display, device->pixmap, device->drawable, device->gc, + 0, 0, + device->base.width, device->base.height, + 0, 0); + } else { + XImage xshm; + int native_byte_order = _native_byte_order_lsb () ? LSBFirst : MSBFirst; + + xshm.width = device->base.width; + xshm.height = device->base.height; + xshm.format = ZPixmap; + xshm.byte_order = native_byte_order; + xshm.bitmap_unit = 32; /* always for libpixman */ + xshm.bitmap_bit_order = native_byte_order; + xshm.bitmap_pad = 32; /* always for libpixman */ + xshm.depth = 24; + xshm.red_mask = 0xff; + xshm.green_mask = 0xff00; + xshm.blue_mask = 0xff000; + xshm.xoffset = 0; + xshm.bits_per_pixel = 32; + xshm.data = device->shm.shmaddr; + xshm.obdata = (char *) &device->shm; + xshm.bytes_per_line = device->stride; + + XShmPutImage (device->display, device->drawable, device->gc, &xshm, + 0, 0, 0, 0, device->base.width, device->base.height, + False); + } + + XSync (device->display, True); +} + +static struct framebuffer * +get_fb (struct device *abstract_device) +{ + struct xshm_device *device = (struct xshm_device *) abstract_device; + return &device->fb; +} + +struct device * +xshm_open (int argc, char **argv) +{ + struct xshm_device *device; + Display *dpy; + Screen *scr; + int screen; + XSetWindowAttributes attr; + int major, minor, has_pixmap; + int x, y; + XGCValues gcv; + + dpy = XOpenDisplay (NULL); + if (dpy == NULL) + return NULL; + + if (! XShmQueryExtension (dpy)) { + XCloseDisplay (dpy); + return NULL; + } + + device = (struct xshm_device *) malloc (sizeof (struct xshm_device)); + device->base.name = "xshm"; + device->base.get_framebuffer = get_fb; + device->display = dpy; + + screen = DefaultScreen (dpy); + scr = XScreenOfDisplay (dpy, screen); + device->base.width = WidthOfScreen (scr); + device->base.height = HeightOfScreen (scr); + device_get_size (argc, argv, &device->base.width, &device->base.height); + x = y = 0; + switch (device_get_split(argc, argv)) { + case SPLIT_NONE: + break; + case SPLIT_LEFT: + device->base.width /= 2; + break; + case SPLIT_RIGHT: + x = device->base.width /= 2; + break; + case SPLIT_TOP: + device->base.height /= 2; + break; + case SPLIT_BOTTOM: + y = device->base.height /= 2; + break; + + case SPLIT_BOTTOM_LEFT: + device->base.width /= 2; + y = device->base.height /= 2; + break; + case SPLIT_BOTTOM_RIGHT: + x = device->base.width /= 2; + y = device->base.height /= 2; + break; + + case SPLIT_TOP_LEFT: + device->base.width /= 2; + device->base.height /= 2; + break; + case SPLIT_TOP_RIGHT: + x = device->base.width /= 2; + device->base.height /= 2; + break; + } + + attr.override_redirect = True; + device->drawable = XCreateWindow (dpy, DefaultRootWindow (dpy), + x, y, + device->base.width, device->base.height, 0, + DefaultDepth (dpy, screen), + InputOutput, + DefaultVisual (dpy, screen), + CWOverrideRedirect, &attr); + XMapWindow (dpy, device->drawable); + + device->stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, device->base.width); + + device->shm.shmid = shmget(IPC_PRIVATE, device->stride * device->base.height, IPC_CREAT | 0777); + device->shm.shmaddr = (char *) shmat (device->shm.shmid, NULL, 0); + device->shm.readOnly = False; + + if (!XShmAttach (dpy, &device->shm)) + abort (); + + device->base.scanout = cairo_image_surface_create_for_data ((uint8_t *) device->shm.shmaddr, + CAIRO_FORMAT_RGB24, + device->base.width, + device->base.height, + device->stride); + XShmQueryVersion (dpy, &major, &minor, &has_pixmap); + + if (has_pixmap) { + printf ("Using SHM Pixmap\n"); + device->pixmap = XShmCreatePixmap (dpy, + device->drawable, + device->shm.shmaddr, + &device->shm, + device->base.width, + device->base.height, + 24); + } else { + printf ("Using SHM PutImage\n"); + device->pixmap = 0; + } + + gcv.graphics_exposures = False; + device->gc = XCreateGC (dpy, device->drawable, GCGraphicsExposures, &gcv); + + device->fb.device = &device->base; + device->fb.show = show; + device->fb.destroy = destroy; + device->fb.surface = device->base.scanout; + + return &device->base; +} |