Function obdDumpBuffer

lib/OneBitDisplay/OneBitDisplay.cpp:791–839

SharpDumpBuffer() */ Dump a screen's worth of data directly to the display Try to speed it up by comparing the new bytes with the existing buffer

// Try to speed it up by comparing the new bytes with the existing buffer
//
void obdDumpBuffer(OBDISP *pOBD, uint8_t *pBuffer)
{
	int x, y, iPitch;
	int iLines, iCols;
	uint8_t bNeedPos;
	uint8_t *pSrc = pOBD->ucScreen;

	iPitch = pOBD->width;
	if (pOBD->type == LCD_VIRTUAL) // wrong function for this type of display
		return;
	if (pBuffer == NULL) // dump the internal buffer if none is given
		pBuffer = pOBD->ucScreen;
	if (pBuffer == NULL)
		return; // no backbuffer and no provided buffer

	if (pOBD->type >= SHARP_144x168) // special case for Sharp Memory LCD
	{
		SharpDumpBuffer(pOBD, pBuffer);
		return;
	}
	iLines = pOBD->height >> 3;
	iCols = pOBD->width >> 4;
	for (y = 0; y < iLines; y++)
	{
		bNeedPos = 1;               // start of a new line means we need to set the position too
		for (x = 0; x < iCols; x++) // wiring library has a 32-byte buffer, so send 16 bytes so that the data prefix (0x40) can fit
		{
			if (pOBD->ucScreen == NULL || pBuffer == pSrc || memcmp(pSrc, pBuffer, 16) != 0) // doesn't match, need to send it
			{
				if (bNeedPos) // need to reposition output cursor?
				{
					bNeedPos = 0;
					obdCachedFlush(pOBD, 1);
					obdSetPosition(pOBD, x * 16, y, 1);
				}
				obdCachedWrite(pOBD, pBuffer, 16, 1);
			}
			else
			{
				bNeedPos = 1; // we're skipping a block, so next time will need to set the new position
			}
			pSrc += 16;
			pBuffer += 16;
		}                               // for x
		pSrc += (iPitch - pOBD->width); // for narrow displays, skip to the next line
		pBuffer += (iPitch - pOBD->width);
	} // for y
	obdCachedFlush(pOBD, 1);
} /* obdDumpBuffer() */

// A valid CW or CCW move returns 1 or -1, invalid returns 0.
static int obdMenuReadRotary(SIMPLEMENU *sm)