On 09/20/2012 07:21 AM, Robert Bragg wrote:
This adds an egl_probe_front_pixel_rgb function that is analogous to
piglit_probe_pixel_rgba except it probes the front buffer instead of
probing the back buffer.
---
tests/egl/egl-util.c | 30 ++++++++++++++++++++++++++++++
tests/egl/egl-util.h | 4 ++++
2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/tests/egl/egl-util.c b/tests/egl/egl-util.c
index 20cd699..e26add4 100644
--- a/tests/egl/egl-util.c
+++ b/tests/egl/egl-util.c
@@ -37,6 +37,36 @@ static int automatic;
int depth;
+int
+egl_probe_front_pixel_rgb(struct egl_state *state,
+ int x, int y, const float *expected)
+{
+ XImage *ximage = XGetImage(state->dpy, state->win,
+ x, state->height - y - 1, 1, 1, AllPlanes,
ZPixmap);
+ unsigned long pixel = XGetPixel(ximage, 0, 0);
+ uint8_t *probe = (uint8_t *)&pixel;
+ int pass = 1;
+
+ XDestroyImage(ximage);
+
+ /* NB: XGetPixel returns a normalized BGRA, byte per
+ * component, pixel format */
Is that always true? Don't you need to examine the window's
XVisualInfo's red/green/blue_mask vales to determine the position of
the components in the ulong?
In any case, 8-bit BGRA can probably be safely assumed for now.
+ if (probe[2] != expected[0]*255 ||
+ probe[1] != expected[1]*255 ||
+ probe[0] != expected[2]*255) {
+ pass = 0;
+ }
The other pixel probing functions in piglit use "fabs(probe -
expected) < piglit_tolerance" when comparing actual/expected values.
Shouldn't you do that here too?
+
+ if (pass)
+ return 1;
+
+ printf("Front Buffer Probe at (%i,%i)\n", x, y);
+ printf(" Expected: %f %f %f %f\n", expected[0], expected[1],
expected[2], expected[3]);
+ printf(" Observed: %f %f %f %f\n", probe[0]/255.0, probe[1]/255.0,
probe[2]/255.0, probe[3]/255.0);
+
+ return 0;
+}
+
void
egl_init_test(struct egl_test *test)
{
diff --git a/tests/egl/egl-util.h b/tests/egl/egl-util.h
index 87c2db3..e1caa94 100644
--- a/tests/egl/egl-util.h
+++ b/tests/egl/egl-util.h
@@ -62,4 +62,8 @@ egl_util_create_pixmap(struct egl_state *state,
int egl_util_run(const struct egl_test *test, int argc, char *argv[]);
+int
+egl_probe_front_pixel_rgb(struct egl_state *state,
+ int x, int y, const float *expected);
+
#endif
-Brian
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