// This is the entry_point for the encode function, and will make sure the result
// sane.
xyuv::frame encode_frame(const xyuv::yuv_image &yuva_in, const xyuv::format &format) {
bool dimensions_match = yuva_in.image_w == format.image_w && yuva_in.image_h == format.image_h;
// Short path.
if (dimensions_match && yuva_in.siting == format.chroma_siting) {
return internal_encode_frame(yuva_in, format);
}
// Otherwise we will need to do some conversion.
const yuv_image *image = &yuva_in;
yuv_image temp;
if (!dimensions_match) {
if (!is_444(image->siting.subsampling)) {
temp = up_sample(*image);
image = &temp;
}
temp = scale_yuv_image(*image, format.image_w, format.image_h);
image = &temp;
}
if (!(image->siting == format.chroma_siting)) {
if (image->siting.subsampling.macro_px_w > 1 ||
image->siting.subsampling.macro_px_h > 1) {
temp = up_sample(*image);
image = &temp;
}
// At this point *image is 444
if (format.chroma_siting.subsampling.macro_px_w > 1 ||
format.chroma_siting.subsampling.macro_px_h > 1) {
temp = down_sample(*image, format.chroma_siting);
image = &temp;
}
}
return internal_encode_frame(*image, format);
}
void rgb_image::from_yuv_image(const xyuv::yuv_image & image_in, const xyuv::conversion_matrix & conversion_matrix ) {
const yuv_image * img = &image_in;
try {
if (!is_444(image_in.siting.subsampling)) {
img = new yuv_image(up_sample(image_in));
}
xyuv_from_yuv_image_444(*img, conversion_matrix);
if (img != &image_in) {
delete img;
}
} catch (...) {
if (img != &image_in) {
delete img;
}
throw;
}
}
static ssize_t up_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct up_dev_s *priv;
FAR struct touch_sample_s *report;
struct up_sample_s sample;
int ret;
ivdbg("len=%d\n", len);
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct up_dev_s *)inode->i_private;
/* Verify that the caller has provided a buffer large enough to receive
* the touch data.
*/
if (len < SIZEOF_TOUCH_SAMPLE_S(1))
{
/* We could provide logic to break up a touch report into segments and
* handle smaller reads... but why?
*/
return -ENOSYS;
}
/* Get exclusive access to the driver data structure */
ret = sem_wait(&priv->devsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
/* Try to read sample data. */
ret = up_sample(priv, &sample);
if (ret < 0)
{
/* Sample data is not available now. We would ave to wait to get
* receive sample data. If the user has specified the O_NONBLOCK
* option, then just return an error.
*/
if (filep->f_oflags & O_NONBLOCK)
{
ret = -EAGAIN;
goto errout;
}
/* Wait for sample data */
ret = up_waitsample(priv, &sample);
if (ret < 0)
{
/* We might have been awakened by a signal */
goto errout;
}
}
/* In any event, we now have sampled touchscreen data that we can report
* to the caller.
*/
report = (FAR struct touch_sample_s *)buffer;
memset(report, 0, SIZEOF_TOUCH_SAMPLE_S(1));
report->npoints = 1;
report->point[0].id = priv->id;
report->point[0].x = sample.x;
report->point[0].y = sample.y;
report->point[0].h = 1;
report->point[0].w = 1;
report->point[0].pressure = 42;
/* Report the appropriate flags */
if (sample.contact == CONTACT_UP)
{
/* Pen is now up */
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID;
}
else if (sample.contact == CONTACT_DOWN)
{
/* First contact */
report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID | TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
}
else /* if (sample->contact == CONTACT_MOVE) */
{
/* Movement of the same contact */
report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID | TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
}
ret = SIZEOF_TOUCH_SAMPLE_S(1);
errout:
ivdbg("Returning %d\n", ret);
sem_post(&priv->devsem);
return ret;
}
static int up_waitsample(FAR struct up_dev_s *priv,
FAR struct up_sample_s *sample)
{
irqstate_t flags;
int ret;
/* Interrupts me be disabled when this is called to (1) prevent posting
* of semphores from interrupt handlers, and (2) to prevent sampled data
* from changing until it has been reported.
*
* In addition, we will also disable pre-emption to prevent other threads
* from getting control while we muck with the semaphores.
*/
sched_lock();
flags = irqsave();
/* Now release the semaphore that manages mutually exclusive access to
* the device structure. This may cause other tasks to become ready to
* run, but they cannot run yet because pre-emption is disabled.
*/
sem_post(&priv->devsem);
/* Try to get the a sample... if we cannot, then wait on the semaphore
* that is posted when new sample data is available.
*/
while (up_sample(priv, sample) < 0)
{
/* Wait for a change in the touchscreen state */
ivdbg("Waiting...\n");
priv->nwaiters++;
ret = sem_wait(&priv->waitsem);
priv->nwaiters--;
ivdbg("Awakened...\n");
if (ret < 0)
{
/* If we are awakened by a signal, then we need to return
* the failure now.
*/
DEBUGASSERT(errno == EINTR);
ret = -EINTR;
goto errout;
}
}
/* Re-acquire the the semaphore that manages mutually exclusive access to
* the device structure. We may have to wait here. But we have our sample.
* Interrupts and pre-emption will be re-enabled while we wait.
*/
ret = sem_wait(&priv->devsem);
errout:
/* Then re-enable interrupts. We might get interrupt here and there
* could be a new sample. But no new threads will run because we still
* have pre-emption disabled.
*/
irqrestore(flags);
/* Restore pre-emption. We might get suspended here but that is okay
* because we already have our sample. Note: this means that if there
* were two threads reading from the touchscreen for some reason, the data
* might be read out of order.
*/
sched_unlock();
return ret;
}
