void
ViewHistory::Update(DataHistory* history, int32 width, int32 resolution,
bigtime_t toTime, bigtime_t step, bigtime_t refresh)
{
if (width > 16384) {
// ignore this - it seems the view hasn't been layouted yet
return;
}
// Check if we need to invalidate the existing values
if ((int32)fValues.Size() != width
|| fResolution != resolution
|| fRefresh != refresh) {
fValues.SetSize(width);
fResolution = resolution;
fRefresh = refresh;
fLastTime = 0;
}
// Compute how many new values we need to retrieve
if (fLastTime < history->Start())
fLastTime = history->Start();
if (fLastTime > history->End())
return;
int32 updateWidth = int32((toTime - fLastTime) / step);
if (updateWidth < 1)
return;
if (updateWidth > (int32)fValues.Size()) {
updateWidth = fValues.Size();
fLastTime = toTime - updateWidth * step;
}
for (int32 i = 0; i < updateWidth; i++) {
int64 value = history->ValueAt(fLastTime += step);
if (step > refresh) {
uint32 count = 1;
for (bigtime_t offset = refresh; offset < step; offset += refresh) {
// TODO: handle int64 overflow correctly!
value += history->ValueAt(fLastTime + offset);
count++;
}
value /= count;
}
fValues.AddItem(value);
}
}
status_t PNGTrans::AddData( const void* pData, size_t nLen, bool bFinal )
{
if( !m_bWriteMode ) {
// dbprintf("PNG-Read: AddData()\n");
if ( setjmp( m_psPNGStruct->jmpbuf ) ) {
png_destroy_read_struct( &m_psPNGStruct, &m_psPNGInfo, (png_infopp)NULL );
return -1;
}
png_process_data( m_psPNGStruct, m_psPNGInfo, (png_bytep)pData, nLen );
return 0;
} else {
m_cInBuffer.Write( pData, nLen );
// dbprintf("PNG-Write: Data added!\n");
if( m_eState == STATE_INIT && m_cInBuffer.Size() > (ssize_t)sizeof( BitmapHeader ) ) {
m_cInBuffer.Read( &m_sBitmapHeader, sizeof( m_sBitmapHeader ) );
m_eState = STATE_FRAMEHDR;
}
if( m_eState == STATE_FRAMEHDR && m_cInBuffer.Size() > (ssize_t)sizeof( BitmapFrameHeader ) ) {
m_cInBuffer.Read( &m_sCurrentFrame, sizeof( m_sCurrentFrame ) );
// TODO: Verify depth, convert if not RGB32
png_set_IHDR( m_psPNGStruct, m_psPNGInfo,
m_sCurrentFrame.bf_frame.right - m_sCurrentFrame.bf_frame.left + 1,
m_sCurrentFrame.bf_frame.bottom - m_sCurrentFrame.bf_frame.top + 1,
8, PNG_COLOR_TYPE_RGB, //_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE );
// png_set_filler( m_psPNGStruct, 0xff, PNG_FILLER_AFTER);
png_set_bgr( m_psPNGStruct );
png_write_info( m_psPNGStruct, m_psPNGInfo );
AllocRowBuffer( m_sCurrentFrame.bf_frame.right - m_sCurrentFrame.bf_frame.left + 1 );
m_eState = STATE_READING;
}
while( m_eState == STATE_READING && m_cInBuffer.Size() ) {
if( AppendToRowBuffer() ) {
// Overflow = one row is ready
// dbprintf("PNG-Write: Found Row\n");
png_write_rows( m_psPNGStruct, &m_pRowBuffer, 1);
}
}
if( bFinal ) {
png_write_end( m_psPNGStruct, m_psPNGInfo);
}
return 0;
}
}
bool PNGTrans::AppendToRowBuffer( void )
{
uint8 buffer[1024];
// Free space in rowbuffer
uint32 nSize = m_nRowSize - m_nRowPos;
// Adjust to available amount of data (so we don't get a deadlock)
nSize = nSize > (uint32)m_cInBuffer.Size() ? m_cInBuffer.Size() : nSize;
// Longword alignment, 24 bpp => 32 bpp size conversion
nSize = ((int)( nSize / 3 )) * 4;
// Adjust to available buffer size
nSize = nSize > sizeof( buffer ) ? sizeof(buffer) : nSize;
// dbprintf("pos: %ld, size: %ld\n", m_nRowPos, m_nRowSize);
// Read and convert RGB32 => RGB24
// dbprintf("m_cInBuffer.Read( %p, %ld )...", buffer, nSize);
m_cInBuffer.Read( buffer, nSize );
// dbprintf("Done!\n");
int i, j;
for( i = 0, j = 0; i < nSize; i+=4, j+=3 ) {
m_pRowBuffer[ m_nRowPos + j ] = buffer[ i ];
m_pRowBuffer[ m_nRowPos + j + 1 ] = buffer[ i + 1 ];
m_pRowBuffer[ m_nRowPos + j + 2 ] = buffer[ i + 2 ];
}
m_nRowPos += (nSize/4)*3;
if( m_nRowPos >= m_nRowSize ) {
// dbprintf("New row\n");
m_nRowPos = 0;
return true;
} else {
return false;
}
}
ssize_t PNGTrans::AvailableDataSize()
{
return( m_cOutBuffer.Size() );
}
