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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "demo.h"
struct device *device_open(int argc, char **argv)
{
struct device *device = 0;
enum {
AUTO,
XLIB,
XIMAGE,
XCB,
GLX,
DRM,
} backend = AUTO;
int n;
for (n = 1; n < argc; n++) {
if (strcmp (argv[n], "--xlib") == 0) {
backend = XLIB;
} else if (strcmp (argv[n], "--xcb") == 0) {
backend = XCB;
} else if (strcmp (argv[n], "--ximage") == 0) {
backend = XIMAGE;
} else if (strcmp (argv[n], "--drm") == 0) {
backend = DRM;
} else if (strcmp (argv[n], "--glx") == 0) {
backend = GLX;
}
}
if (backend == AUTO) {
if (device == 0 && HAVE_DRM)
device = drm_open (argc, argv);
if (device == 0 && HAVE_XCB)
device = xcb_open (argc, argv);
if (device == 0 && HAVE_XLIB)
device = xlib_open (argc, argv);
if (device == 0 && HAVE_XLIB)
device = glx_open (argc, argv);
if (device == 0 && HAVE_XIMAGE)
device = ximage_open (argc, argv);
} else switch (backend) {
case AUTO:
case XLIB:
device = xlib_open (argc, argv);
break;
case XCB:
device = xcb_open (argc, argv);
break;
case XIMAGE:
device = ximage_open (argc, argv);
break;
case GLX:
device = glx_open (argc, argv);
break;
case DRM:
#if HAVE_DRM
device = drm_open (argc, argv);
#endif
break;
}
if (device == 0) {
fprintf(stderr, "Failed to open a drawing device\n");
exit(1);
}
printf("Using backend \"%s\"\n", device->name);
return device;
}
cairo_surface_t *
_cairo_image_surface_create_from_pixbuf(const GdkPixbuf *pixbuf)
{
gint width = gdk_pixbuf_get_width (pixbuf);
gint height = gdk_pixbuf_get_height (pixbuf);
guchar *gdk_pixels = gdk_pixbuf_get_pixels (pixbuf);
int gdk_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
int n_channels = gdk_pixbuf_get_n_channels (pixbuf);
int cairo_stride;
guchar *cairo_pixels;
cairo_format_t format;
cairo_surface_t *surface;
int j;
if (n_channels == 3)
format = CAIRO_FORMAT_RGB24;
else
format = CAIRO_FORMAT_ARGB32;
surface = cairo_image_surface_create(format, width, height);
if (cairo_surface_status(surface))
return surface;
cairo_stride = cairo_image_surface_get_stride (surface);
cairo_pixels = cairo_image_surface_get_data(surface);
for (j = height; j; j--) {
guchar *p = gdk_pixels;
guchar *q = cairo_pixels;
if (n_channels == 3) {
guchar *end = p + 3 * width;
while (p < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
q[0] = p[2];
q[1] = p[1];
q[2] = p[0];
#else
q[1] = p[0];
q[2] = p[1];
q[3] = p[2];
#endif
p += 3;
q += 4;
}
} else {
guchar *end = p + 4 * width;
guint t1,t2,t3;
#define MULT(d,c,a,t) G_STMT_START { t = c * a + 0x7f; d = ((t >> 8) + t) >> 8; } G_STMT_END
while (p < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
MULT(q[0], p[2], p[3], t1);
MULT(q[1], p[1], p[3], t2);
MULT(q[2], p[0], p[3], t3);
q[3] = p[3];
#else
q[0] = p[3];
MULT(q[1], p[0], p[3], t1);
MULT(q[2], p[1], p[3], t2);
MULT(q[3], p[2], p[3], t3);
#endif
p += 4;
q += 4;
}
#undef MULT
}
gdk_pixels += gdk_rowstride;
cairo_pixels += cairo_stride;
}
return surface;
}
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