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Calliphora now works.

pull/1552/head
James Jackson-South 6 years ago
parent
0d8aa134de
commit
56765ee1ed
2 changed files with 23 additions and 12 deletions
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  1. 32
      src/ImageSharp/Formats/WebP/Lossless/BackwardReferenceEncoder.cs
  2. 3
      src/ImageSharp/Formats/WebP/Lossless/Vp8LEncoder.cs

32
src/ImageSharp/Formats/WebP/Lossless/BackwardReferenceEncoder.cs
View File

@ -340,6 +340,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
colorCache[i].Init(i);
}
// TODO: Don't use the enumerator here.
// Find the cache_bits giving the lowest entropy.
using List<PixOrCopy>.Enumerator c = refs.Refs.GetEnumerator();
while (c.MoveNext())
@ -363,7 +364,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
++histos[0].Alpha[a];
// Deal with cacheBits > 0.
for (int i = cacheBitsMax; i >= 1; i--, key >>= 1)
for (int i = cacheBitsMax; i >= 1; --i, key >>= 1)
{
if (colorCache[i].Lookup(key) == pix)
{
@ -388,6 +389,12 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
int len = v.Len;
uint bgraPrev = bgra[pos] ^ 0xffffffffu;
// TODO: Original has this loop?
// VP8LPrefixEncode(len, &code, &extra_bits, &extra_bits_value);
// for (i = 0; i <= cache_bits_max; ++i)
// {
// ++histos[i]->literal_[NUM_LITERAL_CODES + code];
// }
// Update the color caches.
do
{
@ -409,7 +416,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
}
}
for (int i = 0; i <= cacheBitsMax; i++)
for (int i = 0; i <= cacheBitsMax; ++i)
{
double entropy = histos[i].EstimateBits();
if (i == 0 || entropy < entropyMin)
@ -461,7 +468,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
// Add first pixel as literal.
AddSingleLiteralWithCostModel(bgra, colorCache, costModel, 0, useColorCache, 0.0f, costManager.Costs, distArray);
for (int i = 1; i < pixCount; i++)
for (int i = 1; i < pixCount; ++i)
{
float prevCost = costManager.Costs[i - 1];
int offset = hashChain.FindOffset(i);
@ -660,7 +667,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
// [i,i+len) + [i+len, length of best match at i+len)
// while we check if we can use:
// [i,j) (where j<=i+len) + [j, length of best match at j)
for (j = iLastCheck + 1; j <= jMax; j++)
for (j = iLastCheck + 1; j <= jMax; ++j)
{
int lenJ = hashChain.FindLength(j);
int reach = j + (lenJ >= MinLength ? lenJ : 1); // 1 for single literal.
@ -720,7 +727,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
int i = pixelCount - 2;
int countsPos = i;
counts[countsPos + 1] = 1;
for (; i >= 0; i--, countsPos--)
for (; i >= 0; --i, --countsPos)
{
if (bgra[i] == bgra[i + 1])
{
@ -739,9 +746,9 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
// Figure out the window offsets around a pixel. They are stored in a
// spiraling order around the pixel as defined by DistanceToPlaneCode.
for (int y = 0; y <= 6; y++)
for (int y = 0; y <= 6; ++y)
{
for (int x = -6; x <= 6; x++)
for (int x = -6; x <= 6; ++x)
{
int offset = (y * xSize) + x;
@ -762,7 +769,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
}
// For narrow images, not all plane codes are reached, so remove those.
for (i = 0; i < WindowOffsetsSizeMax; i++)
for (i = 0; i < WindowOffsetsSizeMax; ++i)
{
if (windowOffsets[i] == 0)
{
@ -774,7 +781,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
// Given a pixel P, find the offsets that reach pixels unreachable from P-1
// with any of the offsets in windowOffsets[].
for (i = 0; i < windowOffsetsSize; i++)
for (i = 0; i < windowOffsetsSize; ++i)
{
bool isReachable = false;
for (int j = 0; j < windowOffsetsSize && !isReachable; ++j)
@ -785,7 +792,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
if (!isReachable)
{
windowOffsetsNew[windowOffsetsNewSize] = windowOffsets[i];
windowOffsetsNewSize++;
++windowOffsetsNewSize;
}
}
@ -917,7 +924,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
refs.Add(PixOrCopy.CreateCopy((uint)xSize, (ushort)prevRowLen));
if (useColorCache)
{
for (int k = 0; k < prevRowLen; k++)
for (int k = 0; k < prevRowLen; ++k)
{
colorCache.Insert(bgra[i + k]);
}
@ -943,6 +950,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
/// </summary>
private static void BackwardRefsWithLocalCache(Span<uint> bgra, int cacheBits, Vp8LBackwardRefs refs)
{
// TODO: Don't use enumerator.
int pixelIndex = 0;
using List<PixOrCopy>.Enumerator c = refs.Refs.GetEnumerator();
var colorCache = new ColorCache();
@ -969,7 +977,7 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
else
{
// refs was created without local cache, so it can not have cache indexes.
for (int k = 0; k < v.Len; k++)
for (int k = 0; k < v.Len; ++k)
{
colorCache.Insert(bgra[pixelIndex++]);
}

3
src/ImageSharp/Formats/WebP/Lossless/Vp8LEncoder.cs
View File

@ -607,12 +607,15 @@ namespace SixLabors.ImageSharp.Formats.WebP.Lossless
{
int cacheBits = 0;
var histogramSymbols = new short[1]; // Only one tree, one symbol.
// TODO: Can HuffmanTreeCode be struct
var huffmanCodes = new HuffmanTreeCode[5];
for (int i = 0; i < huffmanCodes.Length; i++)
{
huffmanCodes[i] = new HuffmanTreeCode();
}
// TODO: Can HuffmanTree be struct
var huffTree = new HuffmanTree[3UL * WebPConstants.CodeLengthCodes];
for (int i = 0; i < huffTree.Length; i++)
{

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