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#include <cairo-xlib.h>
#include <cairo-skia.h>
#include "demo.h"
#include <stdlib.h>
#include <stdio.h>
#include <X11/extensions/XShm.h>
#include <sys/ipc.h>
#include <sys/shm.h>
struct skia_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 skia_device *device = (struct skia_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 ximage;
int native_byte_order = _native_byte_order_lsb () ? LSBFirst : MSBFirst;
ximage.width = device->base.width;
ximage.height = device->base.height;
ximage.format = ZPixmap;
ximage.byte_order = native_byte_order;
ximage.bitmap_unit = 32; /* always for libpixman */
ximage.bitmap_bit_order = native_byte_order;
ximage.bitmap_pad = 32; /* always for libpixman */
ximage.depth = 24;
ximage.red_mask = 0xff;
ximage.green_mask = 0xff00;
ximage.blue_mask = 0xff000;
ximage.xoffset = 0;
ximage.bits_per_pixel = 32;
ximage.data = device->shm.shmaddr;
ximage.obdata = (char *) &device->shm;
ximage.bytes_per_line = device->stride;
XShmPutImage (device->display, device->drawable, device->gc, &ximage,
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 skia_device *device = (struct skia_device *) abstract_device;
return &device->fb;
}
struct device *
skia_open (int argc, char **argv)
{
struct skia_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 skia_device *) malloc (sizeof (struct skia_device));
device->base.name = "skia";
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_skia_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;
}
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