egl/android: Add some useful error messages

It is much easier to debug issues when the application gives some
meaningful error messages. This patch adds few to the EGL Android
platform backend.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

diff --git a/src/egl/drivers/dri2/platform_android.c b/src/egl/drivers/dri2/platform_android.c
index 302eb8509c26cadfcc62d09336eb9328745dc78f..37616f93e686aed6f84521b0171660f2f50a283a 100644 (file)
--- a/src/egl/drivers/dri2/platform_android.c
+++ b/src/egl/drivers/dri2/platform_android.c
@@ -353,8 +353,10 @@ update_buffers(struct dri2_egl_surface *dri2_surf)
       return 0;
 
    /* try to dequeue the next back buffer */
-   if (!dri2_surf->buffer && !droid_window_dequeue_buffer(dri2_surf))
+   if (!dri2_surf->buffer && !droid_window_dequeue_buffer(dri2_surf)) {
+      _eglLog(_EGL_WARNING, "Could not dequeue buffer from native window");
       return -1;
+   }
 
    /* free outdated buffers and update the surface size */
    if (dri2_surf->base.Width != dri2_surf->buffer->width ||
@@ -379,16 +381,21 @@ get_back_bo(struct dri2_egl_surface *dri2_surf)
       return -1;
 
    fd = get_native_buffer_fd(dri2_surf->buffer);
-   if (fd < 0)
+   if (fd < 0) {
+      _eglLog(_EGL_WARNING, "Could not get native buffer FD");
       return -1;
+   }
 
    fourcc = get_fourcc(get_format(dri2_surf->buffer->format));
 
    pitch = dri2_surf->buffer->stride *
       get_format_bpp(dri2_surf->buffer->format);
 
-   if (fourcc == -1 || pitch == 0)
+   if (fourcc == -1 || pitch == 0) {
+      _eglLog(_EGL_WARNING, "Invalid buffer fourcc(%x) or pitch(%d)",
+              fourcc, pitch);
       return -1;
+   }
 
    dri2_surf->dri_image =
       dri2_dpy->image->createImageFromFds(dri2_dpy->dri_screen,