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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "test.h"
#define MAX_DELTA 3
int pixel_difference(uint32_t a, uint32_t b)
{
int max = 0;
int i;
for (i = 0; i < 32; i += 8) {
uint8_t ac = (a >> i) & 0xff;
uint8_t bc = (b >> i) & 0xff;
int d;
if (ac > bc)
d = ac - bc;
else
d = bc - ac;
if (d > max)
max = d;
}
return max;
}
static void
show_pixels(char *buf,
const XImage *real, const XImage *ref,
int x, int y, int w, int h)
{
int i, j, len = 0;
for (j = y - 2; j <= y + 2; j++) {
if (j < 0 || j >= h)
continue;
for (i = x - 2; i <= x + 2; i++) {
if (i < 0 || i >= w)
continue;
len += sprintf(buf+len,
"%08x ",
*(uint32_t*)(real->data +
j*real->bytes_per_line +
i*real->bits_per_pixel/8));
}
len += sprintf(buf+len, "\t");
for (i = x - 2; i <= x + 2; i++) {
if (i < 0 || i >= w)
continue;
len += sprintf(buf+len,
"%08x ",
*(uint32_t*)(ref->data +
j*real->bytes_per_line +
i*real->bits_per_pixel/8));
}
len += sprintf(buf+len, "\n");
}
}
static void test_compare_fallback(struct test *t,
Drawable real_draw, XRenderPictFormat *real_format,
Drawable ref_draw, XRenderPictFormat *ref_format,
int x, int y, int w, int h)
{
XImage *real_image, *ref_image;
char *real, *ref;
char buf[600];
uint32_t mask;
int i, j;
die_unless(real_format->depth == ref_format->depth);
real_image = XGetImage(t->real.dpy, real_draw,
x, y, w, h,
AllPlanes, ZPixmap);
real = real_image->data;
ref_image = XGetImage(t->ref.dpy, ref_draw,
x, y, w, h,
AllPlanes, ZPixmap);
ref = ref_image->data;
mask = depth_mask(real_image->depth);
/* Start with an exact comparison. However, one quicky desires
* a fuzzy comparator to hide hardware inaccuracies...
*/
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
uint32_t a = ((uint32_t *)real)[i] & mask;
uint32_t b = ((uint32_t *)ref)[i] & mask;
if (a != b && pixel_difference(a, b) > MAX_DELTA) {
show_pixels(buf,
real_image, ref_image,
i, j, w, h);
die("discrepancy found at (%d+%d, %d+%d): found %08x, expected %08x (delta: %d)\n%s",
x,i, y,j, a, b, pixel_difference(a, b), buf);
}
}
real += real_image->bytes_per_line;
ref += ref_image->bytes_per_line;
}
XDestroyImage(real_image);
XDestroyImage(ref_image);
}
void test_compare(struct test *t,
Drawable real_draw, XRenderPictFormat *real_format,
Drawable ref_draw, XRenderPictFormat *ref_format,
int x, int y, int w, int h,
const char *info)
{
XImage real_image, ref_image;
Pixmap tmp;
char *real, *ref;
char buf[600];
uint32_t mask;
int i, j;
XGCValues gcv;
GC gc;
if (w * h * 4 > t->real.max_shm_size)
return test_compare_fallback(t,
real_draw, real_format,
ref_draw, ref_format,
x, y, w, h);
test_init_image(&real_image, &t->real.shm, real_format, w, h);
test_init_image(&ref_image, &t->ref.shm, ref_format, w, h);
gcv.graphics_exposures = 0;
die_unless(real_image.depth == ref_image.depth);
die_unless(real_image.bits_per_pixel == ref_image.bits_per_pixel);
die_unless(real_image.bits_per_pixel == 32);
mask = depth_mask(real_image.depth);
tmp = XCreatePixmap(t->real.dpy, real_draw, w, h, real_image.depth);
gc = XCreateGC(t->real.dpy, tmp, GCGraphicsExposures, &gcv);
XCopyArea(t->real.dpy, real_draw, tmp, gc, x, y, w, h, 0, 0);
XShmGetImage(t->real.dpy, tmp, &real_image, 0, 0, AllPlanes);
XFreeGC(t->real.dpy, gc);
XFreePixmap(t->real.dpy, tmp);
real = real_image.data;
tmp = XCreatePixmap(t->ref.dpy, ref_draw, w, h, ref_image.depth);
gc = XCreateGC(t->ref.dpy, tmp, GCGraphicsExposures, &gcv);
XCopyArea(t->ref.dpy, ref_draw, tmp, gc, x, y, w, h, 0, 0);
XShmGetImage(t->ref.dpy, tmp, &ref_image, 0, 0, AllPlanes);
XFreeGC(t->ref.dpy, gc);
XFreePixmap(t->ref.dpy, tmp);
ref = ref_image.data;
/* Start with an exact comparison. However, one quicky desires
* a fuzzy comparator to hide hardware inaccuracies...
*/
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
uint32_t a = ((uint32_t *)real)[i] & mask;
uint32_t b = ((uint32_t *)ref)[i] & mask;
if (a != b && pixel_difference(a, b) > MAX_DELTA) {
show_pixels(buf,
&real_image, &ref_image,
i, j, w, h);
die("discrepancy found at (%d+%d, %d+%d): found %08x, expected %08x (delta: %d)\n%s%s\n",
x,i, y,j, a, b, pixel_difference(a, b), buf, info);
}
}
real += real_image.bytes_per_line;
ref += ref_image.bytes_per_line;
}
}
static int
_native_byte_order_lsb(void)
{
int x = 1;
return *((char *) &x) == 1;
}
void
test_init_image(XImage *ximage,
XShmSegmentInfo *shm,
XRenderPictFormat *format,
int width, int height)
{
int native_byte_order = _native_byte_order_lsb() ? LSBFirst : MSBFirst;
ximage->width = width;
ximage->height = height;
ximage->format = ZPixmap;
ximage->data = shm->shmaddr;
ximage->obdata = (void *)shm;
ximage->byte_order = native_byte_order;
ximage->bitmap_unit = 32;
ximage->bitmap_bit_order = native_byte_order;
ximage->bitmap_pad = 32;
ximage->depth = format->depth;
ximage->bytes_per_line = 4*width;
ximage->bits_per_pixel = 32;
ximage->red_mask = 0xff << 16;
ximage->green_mask = 0xff << 8;
ximage->blue_mask = 0xff << 0;
ximage->xoffset = 0;
XInitImage(ximage);
}
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