vcl: replace alloca() with std::unique_ptr

Change-Id: If0f44ac761afdf50a8e6f5c77023ae5d74fdcad9

vcl/source/outdev/text.cxx

@@ -23,7 +23,6 @@
 #include <cmath>
 
 #include <sal/types.h>
-#include <sal/alloca.h>
 
 #include <basegfx/matrix/b2dhommatrix.hxx>
 
@@ -1019,12 +1018,12 @@ long OutputDevice::GetTextArray( const OUString& rStr, long* pDXAry,
     if( !pSalLayout )
         return 0;
 #if VCL_FLOAT_DEVICE_PIXEL
-    DeviceCoordinate* pDXPixelArray = NULL;
+    std::unique_ptr<DeviceCoordinate[]> pDXPixelArray;
     if(pDXAry)
     {
-        pDXPixelArray = static_cast<DeviceCoordinate*>(alloca(nLen * sizeof(DeviceCoordinate)));
+        pDXPixelArray.reset(new DeviceCoordinate[nLen]);
     }
-    DeviceCoordinate nWidth = pSalLayout->FillDXArray( pDXPixelArray );
+    DeviceCoordinate nWidth = pSalLayout->FillDXArray( pDXPixelArray.get() );
     int nWidthFactor = pSalLayout->GetUnitsPerPixel();
     pSalLayout->Release();
 
@@ -1346,7 +1345,8 @@ SalLayout* OutputDevice::ImplLayout(const OUString& rOrigStr,
         pLayoutCache = nullptr; // don't use cache with modified string!
     }
     DeviceCoordinate nPixelWidth = (DeviceCoordinate)nLogicalWidth;
-    DeviceCoordinate* pDXPixelArray = NULL;
+    std::unique_ptr<DeviceCoordinate[]> xDXPixelArray;
+    DeviceCoordinate* pDXPixelArray(nullptr);
     if( nLogicalWidth && mbMap )
     {
         nPixelWidth = LogicWidthToDeviceCoordinate( nLogicalWidth );
@@ -1357,7 +1357,8 @@ SalLayout* OutputDevice::ImplLayout(const OUString& rOrigStr,
         if(mbMap)
         {
             // convert from logical units to font units using a temporary array
-            pDXPixelArray = static_cast<DeviceCoordinate*>(alloca( nLen * sizeof(DeviceCoordinate) ));
+            xDXPixelArray.reset(new DeviceCoordinate[nLen]);
+            pDXPixelArray = xDXPixelArray.get();
             // using base position for better rounding a.k.a. "dancing characters"
             DeviceCoordinate nPixelXOfs = LogicWidthToDeviceCoordinate( rLogicalPos.X() );
             for( int i = 0; i < nLen; ++i )
@@ -1368,7 +1369,8 @@ SalLayout* OutputDevice::ImplLayout(const OUString& rOrigStr,
         else
         {
 #if VCL_FLOAT_DEVICE_PIXEL
-            pDXPixelArray = static_cast<DeviceCoordinate*>(alloca( nLen * sizeof(DeviceCoordinate) ));
+            xDXPixelArray.reset(new DeviceCoordinate[nLen]);
+            pDXPixelArray = xDXPixelArray.get();
             for( int i = 0; i < nLen; ++i )
             {
                 pDXPixelArray[i] = pDXArray[i];
@@ -1693,8 +1695,8 @@ void OutputDevice::ImplDrawText( OutputDevice& rTargetDevice, const Rectangle& r
                         long        nMnemonicY;
                         DeviceCoordinate nMnemonicWidth;
 
-                        long* pCaretXArray = static_cast<long*>(alloca( 2 * sizeof(long) * nLineLen ));
-                        /*sal_Bool bRet =*/ _rLayout.GetCaretPositions( aStr, pCaretXArray,
+                        std::unique_ptr<long[]> const pCaretXArray(new long[2 * nLineLen]);
+                        /*sal_Bool bRet =*/ _rLayout.GetCaretPositions( aStr, pCaretXArray.get(),
                                                 nIndex, nLineLen );
                         long lc_x1 = pCaretXArray[2*(nMnemonicPos - nIndex)];
                         long lc_x2 = pCaretXArray[2*(nMnemonicPos - nIndex)+1];
@@ -1762,8 +1764,8 @@ void OutputDevice::ImplDrawText( OutputDevice& rTargetDevice, const Rectangle& r
         DeviceCoordinate nMnemonicWidth = 0;
         if ( nMnemonicPos != -1 )
         {
-            long* pCaretXArray = static_cast<long*>(alloca( 2 * sizeof(long) * aStr.getLength() ));
-            /*sal_Bool bRet =*/ _rLayout.GetCaretPositions( aStr, pCaretXArray, 0, aStr.getLength() );
+            std::unique_ptr<long[]> const pCaretXArray(new long[2 * aStr.getLength()]);
+            /*sal_Bool bRet =*/ _rLayout.GetCaretPositions( aStr, pCaretXArray.get(), 0, aStr.getLength() );
             long lc_x1 = pCaretXArray[2*(nMnemonicPos)];
             long lc_x2 = pCaretXArray[2*(nMnemonicPos)+1];
             nMnemonicWidth = rTargetDevice.LogicWidthToDeviceCoordinate( std::abs(lc_x1 - lc_x2) );
@@ -2213,8 +2215,8 @@ void OutputDevice::DrawCtrlText( const Point& rPos, const OUString& rStr,
                 nMnemonicPos = nLen-1;
             }
 
-            long* pCaretXArray = static_cast<long*>(alloca( 2 * sizeof(long) * nLen ));
-            /*sal_Bool bRet =*/ GetCaretPositions( aStr, pCaretXArray, nIndex, nLen );
+            std::unique_ptr<long[]> const pCaretXArray(new long[2 * nLen]);
+            /*sal_Bool bRet =*/ GetCaretPositions( aStr, pCaretXArray.get(), nIndex, nLen );
             long lc_x1 = pCaretXArray[ 2*(nMnemonicPos - nIndex) ];
             long lc_x2 = pCaretXArray[ 2*(nMnemonicPos - nIndex)+1 ];
             nMnemonicWidth = ::abs((int)(lc_x1 - lc_x2));