Migrate `Cl2DrawOutline` to accept a buffer

Source/engine.cpp

@@ -1070,27 +1070,18 @@ void Cl2Draw(CelOutputBuffer out, int sx, int sy, BYTE *pCelBuff, int nCel, int
 
 	Cl2BlitSafe(out, sx, sy, pRLEBytes, nDataSize, nWidth);
 }
-/**
- * @brief Blit a solid colder shape one pixel larger then the given sprite shape, to the back buffer at the given coordianates
- * @param col Color index from current palette
- * @param sx Back buffer coordinate
- * @param sy Back buffer coordinate
- * @param pCelBuff CL2 buffer
- * @param nCel CL2 frame number
- * @param nWidth Width of sprite
- */
-void Cl2DrawOutline(BYTE col, int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth)
+
+void Cl2DrawOutline(CelOutputBuffer out, BYTE col, int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth)
 {
 	int nDataSize;
 	BYTE *pRLEBytes;
 
-	assert(gpBuffer != NULL);
+	assert(out.begin != NULL);
 	assert(pCelBuff != NULL);
 	assert(nCel > 0);
 
 	pRLEBytes = CelGetFrameClipped(pCelBuff, nCel, &nDataSize);
 
-	CelOutputBuffer out = GlobalBackBuffer();
 	out.end -= out.line_width;
 	Cl2BlitOutlineSafe(out, sx, sy, pRLEBytes, nDataSize, nWidth, col);
 }

Source/engine.h

@@ -254,18 +254,19 @@ void SetPixel(CelOutputBuffer out, int sx, int sy, BYTE col);
 void Cl2Draw(CelOutputBuffer out, int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth);
 
 /**
- * @brief Blit a solid colder shape one pixel larger then the given sprite shape, to the back buffer at the given coordianates
+ * @brief Blit a solid colder shape one pixel larger then the given sprite shape, to the given buffer at the given coordianates
  * @param col Color index from current palette
- * @param sx Back buffer coordinate
- * @param sy Back buffer coordinate
+ * @param out Output buffer
+ * @param sx Output buffer coordinate
+ * @param sy Output buffer coordinate
  * @param pCelBuff CL2 buffer
  * @param nCel CL2 frame number
  * @param nWidth Width of sprite
  */
-void Cl2DrawOutline(BYTE col, int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth);
+void Cl2DrawOutline(CelOutputBuffer out, BYTE col, int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth);
 
 /**
- * @brief Blit CL2 sprite, and apply a given lighting, to the back buffer at the given coordianates
+ * @brief Blit CL2 sprite, and apply a given lighting, to the given buffer at the given coordianates
  * @param out Output buffer
  * @param sx Output buffer coordinate
  * @param sy Output buffer coordinate
@@ -277,7 +278,7 @@ void Cl2DrawOutline(BYTE col, int sx, int sy, BYTE *pCelBuff, int nCel, int nWid
 void Cl2DrawLightTbl(CelOutputBuffer out, int sx, int sy, BYTE *pCelBuff, int nCel, int nWidth, char light);
 
 /**
- * @brief Blit CL2 sprite, and apply lighting, to the back buffer at the given coordinates
+ * @brief Blit CL2 sprite, and apply lighting, to the given buffer at the given coordinates
  * @param out Output buffer
  * @param sx Output buffer coordinate
  * @param sy Output buffer coordinate

Source/scrollrt.cpp

@@ -431,7 +431,7 @@ static void DrawPlayer(CelOutputBuffer out, int pnum, int x, int y, int px, int
 	}
 
 	if (pnum == pcursplr)
-		Cl2DrawOutline(165, px, py, pCelBuff, nCel, nWidth);
+		Cl2DrawOutline(out, 165, px, py, pCelBuff, nCel, nWidth);
 
 	if (pnum == myplr) {
 		Cl2Draw(out, px, py, pCelBuff, nCel, nWidth);
@@ -695,7 +695,7 @@ static void DrawMonsterHelper(CelOutputBuffer out, int x, int y, int oy, int sx,
 	px = sx + pMonster->_mxoff - pMonster->MType->width2;
 	py = sy + pMonster->_myoff;
 	if (mi == pcursmonst) {
-		Cl2DrawOutline(233, px, py, pMonster->_mAnimData, pMonster->_mAnimFrame, pMonster->MType->width);
+		Cl2DrawOutline(out, 233, px, py, pMonster->_mAnimData, pMonster->_mAnimFrame, pMonster->MType->width);
 	}
 	DrawMonster(out, x, y, px, py, mi);
 }