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HDR (RGE) Code Review

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This commit is contained in:
Chuck Walbourn 2016-09-19 11:20:32 -07:00
parent 055ad9025d
commit 303806d29f
1 changed files with 115 additions and 2 deletions
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117
DirectXTex/DirectXTexHDR.cpp
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@ -34,6 +34,9 @@
//Uncomment to disable the use of adapative RLE encoding when writing an HDR. Used for testing only.
//#define DISABLE_COMPRESS
//Uncomment to use "old colors" standard RLE encoding when writing an HDR. Used for testing only.
//#define WRITE_OLD_COLORS
using namespace DirectX;
namespace
@ -324,7 +327,7 @@ namespace
// Encode using Adapative RLE
//-------------------------------------------------------------------------------------
_Success_(return > 0)
size_t EncodeRLE(_Out_writes_(width*4) uint8_t* enc, _In_reads_(width*4) uint8_t* rgbe, size_t rowPitch, size_t width)
size_t EncodeRLE(_Out_writes_(width * 4) uint8_t* enc, _In_reads_(width * 4) const uint8_t* rgbe, size_t rowPitch, size_t width)
{
if (width < 8 || width > 32767)
{
@ -332,6 +335,109 @@ namespace
return 0;
}
#ifdef WRITE_OLD_COLORS
size_t encSize = 0;
const uint8_t* scanPtr = rgbe;
for (size_t pixelCount = 0; pixelCount < width;)
{
size_t spanLen = 1;
const uint32_t* spanPtr = reinterpret_cast<const uint32_t*>(scanPtr);
while (pixelCount + spanLen < width && spanLen < 32767)
{
if (spanPtr[spanLen] == *spanPtr)
{
++spanLen;
}
else
break;
}
if (spanLen > 2)
{
if (scanPtr[0] == 1 && scanPtr[1] == 1 && scanPtr[2] == 1)
{
return 0;
}
if (encSize + 8 > rowPitch)
return 0;
uint8_t rleLen = static_cast<uint8_t>(std::min<size_t>(spanLen - 1, 255));
enc[0] = scanPtr[0];
enc[1] = scanPtr[1];
enc[2] = scanPtr[2];
enc[3] = scanPtr[3];
enc[4] = 1;
enc[5] = 1;
enc[6] = 1;
enc[7] = rleLen;
enc += 8;
encSize += 8;
size_t remaining = spanLen - 1 - rleLen;
if (remaining > 0)
{
rleLen = static_cast<uint8_t>(remaining >> 8);
if (rleLen > 0)
{
if (encSize + 4 > rowPitch)
return 0;
enc[0] = 1;
enc[1] = 1;
enc[2] = 1;
enc[3] = rleLen;
enc += 4;
encSize += 4;
remaining -= (rleLen << 8);
}
while (remaining > 0)
{
if (encSize + 4 > rowPitch)
return 0;
enc[0] = scanPtr[0];
enc[1] = scanPtr[1];
enc[2] = scanPtr[2];
enc[3] = scanPtr[3];
enc += 4;
encSize += 4;
--remaining;
}
}
scanPtr += spanLen * 4;
pixelCount += spanLen;
}
else if (scanPtr[0] == 1 && scanPtr[1] == 1 && scanPtr[2] == 1)
{
return 0;
}
else
{
if (encSize + 4 > rowPitch)
return 0;
enc[0] = scanPtr[0];
enc[1] = scanPtr[1];
enc[2] = scanPtr[2];
enc[3] = scanPtr[3];
enc += 4;
encSize += 4;
++pixelCount;
scanPtr += 4;
}
}
return encSize;
#else
enc[0] = 2;
enc[1] = 2;
enc[2] = uint8_t(width >> 8);
@ -343,7 +449,7 @@ namespace
for (int channel = 0; channel < 4; ++channel)
{
uint8_t* spanPtr = rgbe + channel;
const uint8_t* spanPtr = rgbe + channel;
for (size_t pixelCount = 0; pixelCount < width;)
{
uint8_t spanLen = 1;
@ -397,6 +503,7 @@ namespace
}
return encSize;
#endif
}
}
@ -608,6 +715,12 @@ HRESULT DirectX::LoadFromHDRMemory(const void* pSource, size_t size, TexMetadata
{
if (inColor[0] == 1 && inColor[1] == 1 && inColor[2] == 1)
{
if (bitShift > 24)
{
image.Release();
return E_FAIL;
}
// "Standard" Run Length Encoding
size_t spanLen = size_t(inColor[3]) << bitShift;
if (spanLen + pixelCount > mdata.width)