Function CelDrawLightRedSafe

Source/engine.cpp:436–483

* @brief Same as CelDrawLightRed but checks for drawing outside the buffer * @param sx Back buffer coordinate * @param sy Back buffer coordinate * @param pCelBuff Cel data * @param nCel CEL frame number * @param nWidth Width of cel * @param light Light shade to use */

 * @param light Light shade to use
 */
void CelDrawLightRedSafe(int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth, char light)
{
	int nDataSize, w, idx;
	BYTE *pRLEBytes, *dst, *tbl;

	assert(gpBuffer);
	assert(pCelBuff != NULL);

	pRLEBytes = CelGetFrameClipped(pCelBuff, nCel, &nDataSize);
	dst = &gpBuffer[sx + BUFFER_WIDTH * sy];

	idx = light4flag ? 1024 : 4096;
	if (light == 2)
		idx += 256;
	if (light >= 4)
		idx += (light - 1) << 8;

	tbl = &pLightTbl[idx];

	BYTE width;
	BYTE *end;

	end = &pRLEBytes[nDataSize];

	for (; pRLEBytes != end; dst -= BUFFER_WIDTH + nWidth) {
		for (w = nWidth; w;) {
			width = *pRLEBytes++;
			if (!(width & 0x80)) {
				w -= width;
				if (dst < gpBufEnd && dst > gpBufStart) {
					while (width) {
						*dst = tbl[*pRLEBytes];
						pRLEBytes++;
						dst++;
						width--;
					}
				} else {
					pRLEBytes += width;
					dst += width;
				}
			} else {
				width = -(char)width;
				dst += width;
				w -= width;
			}
		}
	}
}

/**
 * @brief Blit to a buffer at given coordinates