Fix code analysis warnings

src/ImageSharp/Formats/Heif/Av1/Entropy/Av1Distribution.cs

@@ -115,11 +115,11 @@ internal class Av1Distribution
             uint p = this.probabilities[i];
             if (tmp < p)
             {
-                this.probabilities[i] -= (ushort)(p - tmp >> rate);
+                this.probabilities[i] -= (ushort)((p - tmp) >> rate);
             }
             else
             {
-                this.probabilities[i] += (ushort)(tmp - p >> rate);
+                this.probabilities[i] += (ushort)((tmp - p) >> rate);
             }
         }
 

src/ImageSharp/Formats/Heif/Av1/Entropy/Av1NzMap.cs

@@ -336,7 +336,7 @@ internal static class Av1NzMap
             return 0;
         }
 
-        int ctx = stats + 1 >> 1;
+        int ctx = (stats + 1) >> 1;
         ctx = Math.Min(ctx, 4);
         switch (transformClass)
         {

src/ImageSharp/Formats/Heif/Av1/Entropy/Av1SymbolDecoder.cs

@@ -250,7 +250,7 @@ internal ref struct Av1SymbolDecoder
                 transformInfo.CodeBlockFlag = false;
             }
 
-            this.UpdateCoefficientContext(modeInfo, aboveContexts, leftContexts, blocksWide, blocksHigh, transformSize, blockPosition, aboveOffset, leftOffset, culLevel, modeBlocksToRightEdge, modeBlocksToBottomEdge);
+            UpdateCoefficientContext(modeInfo, aboveContexts, leftContexts, blocksWide, blocksHigh, transformSize, blockPosition, aboveOffset, leftOffset, culLevel, modeBlocksToRightEdge, modeBlocksToBottomEdge);
             return 0;
         }
 
@@ -281,7 +281,7 @@ internal ref struct Av1SymbolDecoder
 
         DebugGuard.MustBeGreaterThan(scan.Length, 0, nameof(scan));
         culLevel = this.ReadCoefficientsDc(coefficientBuffer, endOfBlock, scan, bwl, levels, transformBlockContext.DcSignContext, planeType);
-        this.UpdateCoefficientContext(modeInfo, aboveContexts, leftContexts, blocksWide, blocksHigh, transformSize, blockPosition, aboveOffset, leftOffset, culLevel, modeBlocksToRightEdge, modeBlocksToBottomEdge);
+        UpdateCoefficientContext(modeInfo, aboveContexts, leftContexts, blocksWide, blocksHigh, transformSize, blockPosition, aboveOffset, leftOffset, culLevel, modeBlocksToRightEdge, modeBlocksToBottomEdge);
 
         transformInfo.CodeBlockFlag = true;
         return endOfBlock;
@@ -298,7 +298,7 @@ internal ref struct Av1SymbolDecoder
             bool bit = this.ReadEndOfBlockExtra(transformSizeContext, planeType, endOfBlockContext);
             if (bit)
             {
-                endOfBlockExtra += 1 << endOfBlockShift - 1;
+                endOfBlockExtra += 1 << (endOfBlockShift - 1);
             }
             else
             {
@@ -306,7 +306,7 @@ internal ref struct Av1SymbolDecoder
                 {
                     if (this.ReadLiteral(1) != 0)
                     {
-                        endOfBlockExtra += 1 << endOfBlockShift - 1 - j;
+                        endOfBlockExtra += 1 << (endOfBlockShift - 1 - j);
                     }
                 }
             }
@@ -497,7 +497,7 @@ internal ref struct Av1SymbolDecoder
         return x - 1;
     }
 
-    private void UpdateCoefficientContext(
+    private static void UpdateCoefficientContext(
         Av1BlockModeInfo modeInfo,
         int[] aboveContexts,
         int[] leftContexts,

src/ImageSharp/Formats/Heif/Av1/Entropy/Av1SymbolEncoder.cs

@@ -273,8 +273,8 @@ internal class Av1SymbolEncoder : IDisposable
         Av1FilterIntraMode filterIntraMode,
         Av1PredictionMode intraDirection)
     {
-        ref Av1SymbolWriter w = ref this.writer;
         // bool isInter = mbmi->block_mi.use_intrabc || is_inter_mode(mbmi->block_mi.mode);
+        ref Av1SymbolWriter w = ref this.writer;
         if (Av1SymbolContextHelper.GetExtendedTransformTypeCount(transformSize, useReducedTransformSet) > 1 && baseQIndex > 0)
         {
             Av1TransformSize square_tx_size = transformSize.GetSquareSize();

src/ImageSharp/Formats/Heif/Av1/Entropy/Av1SymbolReader.cs

@@ -32,7 +32,7 @@ internal ref struct Av1SymbolReader
     {
         this.buffer = span;
         this.position = 0;
-        this.difference = (1U << DecoderWindowsSize - 1) - 1;
+        this.difference = (1U << (DecoderWindowsSize - 1)) - 1;
         this.range = 0x8000;
         this.count = -15;
         this.Refill();
@@ -49,7 +49,7 @@ internal ref struct Av1SymbolReader
 
     public int ReadLiteral(int bitCount)
     {
-        const uint prob = 0x7FFFFFU - (128 << 15) + 128 >> 8;
+        const uint prob = (0x7FFFFFU - (128 << 15) + 128) >> 8;
         int literal = 0;
         for (int bit = bitCount - 1; bit >= 0; bit--)
         {
@@ -82,9 +82,9 @@ internal ref struct Av1SymbolReader
 
         // assert(dif >> (DecoderWindowsSize - 16) < r);
         // assert(32768U <= r);
-        v = (range >> 8) * (frequency >> Av1Distribution.ProbabilityShift) >> 7 - Av1Distribution.ProbabilityShift;
+        v = ((range >> 8) * (frequency >> Av1Distribution.ProbabilityShift)) >> (7 - Av1Distribution.ProbabilityShift);
         v += Av1Distribution.ProbabilityMinimum;
-        vw = v << DecoderWindowsSize - 16;
+        vw = v << (DecoderWindowsSize - 16);
         ret = true;
         newRange = v;
         if (dif >= vw)
@@ -118,17 +118,17 @@ internal ref struct Av1SymbolReader
         uint r = this.range;
         int n = distribution.NumberOfSymbols - 1;
 
-        DebugGuard.MustBeLessThan(dif >> DecoderWindowsSize - 16, r, nameof(r));
+        DebugGuard.MustBeLessThan(dif >> (DecoderWindowsSize - 16), r, nameof(r));
         DebugGuard.IsTrue(distribution[n] == 0, "Last value in probability array needs to be zero.");
         DebugGuard.MustBeGreaterThanOrEqualTo(r, 32768U, nameof(r));
         DebugGuard.MustBeGreaterThanOrEqualTo(7 - Av1Distribution.ProbabilityShift - Av1Distribution.CdfShift, 0, nameof(Av1Distribution.CdfShift));
-        c = dif >> DecoderWindowsSize - 16;
+        c = dif >> (DecoderWindowsSize - 16);
         v = r;
         ret = -1;
         do
         {
             u = v;
-            v = (r >> 8) * (distribution[++ret] >> Av1Distribution.ProbabilityShift) >> 7 - Av1Distribution.ProbabilityShift - Av1Distribution.CdfShift;
+            v = ((r >> 8) * (distribution[++ret] >> Av1Distribution.ProbabilityShift)) >> (7 - Av1Distribution.ProbabilityShift - Av1Distribution.CdfShift);
             v += (uint)(Av1Distribution.ProbabilityMinimum * (n - ret));
         }
         while (c < v);
@@ -136,7 +136,7 @@ internal ref struct Av1SymbolReader
         DebugGuard.MustBeLessThan(v, u, nameof(v));
         DebugGuard.MustBeLessThanOrEqualTo(u, r, nameof(u));
         r = u - v;
-        dif -= v << DecoderWindowsSize - 16;
+        dif -= v << (DecoderWindowsSize - 16);
         this.Normalize(dif, r);
         return ret;
     }
@@ -156,7 +156,7 @@ internal ref struct Av1SymbolReader
         /*d bits in dec->dif are consumed.*/
         this.count -= d;
         /*This is equivalent to shifting in 1's instead of 0's.*/
-        this.difference = (dif + 1 << d) - 1;
+        this.difference = ((dif + 1) << d) - 1;
         this.range = rng << d;
         if (this.count < 0)
         {

src/ImageSharp/Formats/Heif/Av1/Entropy/Av1SymbolWriter.cs

@@ -20,7 +20,7 @@ internal class Av1SymbolWriter : IDisposable
     public Av1SymbolWriter(Configuration configuration, int initialSize)
     {
         this.configuration = configuration;
-        this.memory = new AutoExpandingMemory<ushort>(configuration, initialSize + 1 >> 1);
+        this.memory = new AutoExpandingMemory<ushort>(configuration, (initialSize + 1) >> 1);
     }
 
     public void Dispose() => this.memory.Dispose();
@@ -40,7 +40,7 @@ internal class Av1SymbolWriter : IDisposable
         const uint p = 0x4000U; // (0x7FFFFFU - (128 << 15) + 128) >> 8;
         for (int bit = bitCount - 1; bit >= 0; bit--)
         {
-            bool bitValue = (value >> bit & 0x1) > 0;
+            bool bitValue = ((value >> bit) & 0x1) > 0;
             this.EncodeBoolQ15(bitValue, p);
         }
     }
@@ -54,15 +54,15 @@ internal class Av1SymbolWriter : IDisposable
         int pos = this.position;
         int s = 10;
         uint m = 0x3FFFU;
-        uint e = l + m & ~m | m + 1;
+        uint e = ((l + m) & ~m) | (m + 1);
         s += c;
-        Span<ushort> buffer = this.memory.GetSpan(this.position + (s + 7 >> 3));
+        Span<ushort> buffer = this.memory.GetSpan(this.position + ((s + 7) >> 3));
         if (s > 0)
         {
-            uint n = (1U << c + 16) - 1;
+            uint n = (1U << (c + 16)) - 1;
             do
             {
-                buffer[pos] = (ushort)(e >> c + 16);
+                buffer[pos] = (ushort)(e >> (c + 16));
                 pos++;
                 e &= n;
                 s -= 8;
@@ -72,7 +72,7 @@ internal class Av1SymbolWriter : IDisposable
             while (s > 0);
         }
 
-        c = Math.Max(s + 7 >> 3, 0);
+        c = Math.Max((s + 7) >> 3, 0);
         IMemoryOwner<byte> output = this.configuration.MemoryAllocator.Allocate<byte>(pos + c);
 
         // Perform carry propagation.
@@ -104,7 +104,7 @@ internal class Av1SymbolWriter : IDisposable
         l = this.low;
         r = this.rng;
         DebugGuard.MustBeGreaterThanOrEqualTo(r, 32768U, nameof(r));
-        v = (r >> 8) * (frequency >> Av1Distribution.ProbabilityShift) >> 7 - Av1Distribution.ProbabilityShift;
+        v = ((r >> 8) * (frequency >> Av1Distribution.ProbabilityShift)) >> (7 - Av1Distribution.ProbabilityShift);
         v += Av1Distribution.ProbabilityMinimum;
         if (val)
         {
@@ -145,17 +145,17 @@ internal class Av1SymbolWriter : IDisposable
         {
             uint u;
             uint v;
-            u = (uint)(((r >> 8) * (lowFrequency >> Av1Distribution.ProbabilityShift) >> totalShift) +
-                Av1Distribution.ProbabilityMinimum * (n - (symbol - 1)));
-            v = (uint)(((r >> 8) * (highFrequency >> Av1Distribution.ProbabilityShift) >> totalShift) +
-                Av1Distribution.ProbabilityMinimum * (n - symbol));
+            u = (uint)((((r >> 8) * (lowFrequency >> Av1Distribution.ProbabilityShift)) >> totalShift) +
+                (Av1Distribution.ProbabilityMinimum * (n - (symbol - 1))));
+            v = (uint)((((r >> 8) * (highFrequency >> Av1Distribution.ProbabilityShift)) >> totalShift) +
+                (Av1Distribution.ProbabilityMinimum * (n - symbol)));
             l += r - u;
             r = u - v;
         }
         else
         {
-            r -= (uint)(((r >> 8) * (highFrequency >> Av1Distribution.ProbabilityShift) >> totalShift) +
-                Av1Distribution.ProbabilityMinimum * (n - symbol));
+            r -= (uint)((((r >> 8) * (highFrequency >> Av1Distribution.ProbabilityShift)) >> totalShift) +
+                (Av1Distribution.ProbabilityMinimum * (n - symbol)));
         }
 
         this.Normalize(l, r);

src/ImageSharp/Formats/Heif/Av1/Tiling/Av1BlockStruct.cs

@@ -7,7 +7,7 @@ internal class Av1BlockStruct
 {
     public Av1TransformUnit[] TransformBlocks { get; } = new Av1TransformUnit[Av1Constants.MaxTransformUnitCount];
 
-    public required Av1MacroBlockD av1xd { get; set; }
+    public required Av1MacroBlockD MacroBlock { get; set; }
 
     public int MdScanIndex { get; set; }
 

src/ImageSharp/Formats/Heif/Av1/Tiling/Av1EncoderBlockStruct.cs

@@ -7,7 +7,7 @@ internal partial class Av1TileWriter
 {
     internal class Av1EncoderBlockStruct
     {
-        public required Av1MacroBlockD av1xd { get; internal set; }
+        public required Av1MacroBlockD MacroBlock { get; internal set; }
 
         public required int[] PaletteSize { get; internal set; }
 

src/ImageSharp/Formats/Heif/Av1/Tiling/Av1PictureControlSet.cs

@@ -5,13 +5,13 @@ namespace SixLabors.ImageSharp.Formats.Heif.Av1.Tiling;
 
 internal class Av1PictureControlSet
 {
-    public required Av1NeighborArrayUnit<byte>[] luma_dc_sign_level_coeff_na { get; internal set; }
+    public required Av1NeighborArrayUnit<byte>[] LuminanceDcSignLevelCoefficientNeighbors { get; internal set; }
 
-    public required Av1NeighborArrayUnit<byte>[] cr_dc_sign_level_coeff_na { get; internal set; }
+    public required Av1NeighborArrayUnit<byte>[] CrDcSignLevelCoefficientNeighbors { get; internal set; }
 
-    public required Av1NeighborArrayUnit<byte>[] cb_dc_sign_level_coeff_na { get; internal set; }
+    public required Av1NeighborArrayUnit<byte>[] CbDcSignLevelCoefficientNeighbors { get; internal set; }
 
-    public required Av1NeighborArrayUnit<byte>[] txfm_context_array { get; internal set; }
+    public required Av1NeighborArrayUnit<byte>[] TransformFunctionContexts { get; internal set; }
 
     public required Av1SequenceControlSet Sequence { get; internal set; }