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Fix a bunch of bugs in the decoder

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This commit is contained in:
Pavel Krajcevski 2014-03-18 19:37:03 -04:00
parent 44ebe5d0bb
commit 83588a0c97
1 changed files with 35 additions and 24 deletions
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59
ASTCEncoder/src/Decompressor.cpp
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@ -106,14 +106,14 @@ namespace ASTCC {
}
// First check if the last four bits are zero
if((modeBits & 0xF) != 0) {
if((modeBits & 0xF) == 0) {
params.m_bError = true;
return params;
}
// If the last two bits are zero, then if bits
// [6-8] are all ones, this is also reserved.
if((modeBits & 0x3) != 0 &&
if((modeBits & 0x3) == 0 &&
(modeBits & 0x1C0) == 0x1C0) {
params.m_bError = true;
return params;
@ -290,17 +290,18 @@ namespace ASTCC {
}
}
void DecodeColorValues(uint32 *out, uint8 *data, uint32 *modes, const uint32 nBitsForColorData) {
void DecodeColorValues(uint32 *out, uint8 *data, uint32 *modes,
const uint32 nPartitions, const uint32 nBitsForColorData) {
// First figure out how many color values we have
uint32 nValues = 0;
for(uint32 i = 0; i < 4; i++) {
for(uint32 i = 0; i < nPartitions; i++) {
nValues += ((modes[i]>>2) + 1) << 1;
}
// Then based on the number of values and the remaining number of bits,
// figure out the max value for each of them...
uint32 range = 255;
while(range > 0) {
uint32 range = 256;
while(--range > 0) {
IntegerEncodedValue val = IntegerEncodedValue::CreateEncoding(range);
uint32 bitLength = val.GetBitLength(nValues);
if(bitLength < nBitsForColorData) {
@ -323,13 +324,17 @@ namespace ASTCC {
FasTC::BitStreamReadOnly colorStream (data);
IntegerEncodedValue::
DecodeIntegerSequence(decodedColorValues, colorStream, range, nValues);
assert(nValues == decodedColorValues.size());
// Once we have the decoded values, we need to dequantize them to the 0-255 range
// This procedure is outlined in ASTC spec C.2.13
uint32 outIdx = 0;
std::vector<IntegerEncodedValue>::const_iterator itr;
for(itr = decodedColorValues.begin(); itr != decodedColorValues.end(); itr++) {
// Have we already decoded all that we need?
if(outIdx >= nValues) {
break;
}
const IntegerEncodedValue &val = *itr;
uint32 bitlen = val.BaseBitLength();
uint32 bitval = val.GetBitValue();
@ -603,25 +608,30 @@ namespace ASTCC {
uint32 jt = gt >> 4;
uint32 ft = gt & 0x0F;
uint32 v0 = js + jt * params.m_Width;
assert(v0 < (params.m_Width * params.m_Height));
uint32 p00 = unquantized[plane][v0];
assert((v0 + 1) < (params.m_Width * params.m_Height));
uint32 p01 = unquantized[plane][v0 + 1];
assert((v0 + params.m_Width) < (params.m_Width * params.m_Height));
uint32 p10 = unquantized[plane][v0 + params.m_Width];
assert((v0 + params.m_Width + 1) < (params.m_Width * params.m_Height));
uint32 p11 = unquantized[plane][v0 + params.m_Width + 1];
uint32 w11 = (fs * ft + 8) >> 4;
uint32 w10 = ft - w11;
uint32 w01 = fs - w11;
uint32 w00 = 16 - fs - ft + w11;
uint32 v0 = js + jt * params.m_Width;
#define FIND_TEXEL(tidx, bidx) \
uint32 p##bidx = 0; \
do { \
if(w##bidx > 0) { \
assert((tidx) < (params.m_Width * params.m_Height)); \
p##bidx = unquantized[plane][(tidx)]; \
} \
} \
while(0)
FIND_TEXEL(v0, 00);
FIND_TEXEL(v0 + 1, 01);
FIND_TEXEL(v0 + params.m_Width, 10);
FIND_TEXEL(v0 + params.m_Width + 1, 11);
#undef FIND_TEXEL
out[plane][t*blockWidth + s] = (p00*w00 + p01*w01 + p10*w10 + p11*w11 + 8) >> 4;
}
}
@ -907,7 +917,8 @@ namespace ASTCC {
// Decode both color data and texel weight data
uint32 colorValues[32]; // Four values, two endpoints, four maximum paritions
DecodeColorValues(colorValues, colorEndpointData, colorEndpointMode, colorDataBits);
DecodeColorValues(colorValues, colorEndpointData, colorEndpointMode,
nPartitions, colorDataBits);
std::vector<IntegerEncodedValue> texelWeightValues;
FasTC::BitStreamReadOnly weightStream (texelWeightData);
@ -964,8 +975,8 @@ namespace ASTCC {
uint32 blockWidth = GetBlockWidth(dcj.Format());
uint32 blockHeight = GetBlockHeight(dcj.Format());
uint32 blockIdx = 0;
for(uint32 j = 0; j < dcj.Width(); j++) {
for(uint32 i = 0; i < dcj.Height(); i++) {
for(uint32 j = 0; j < dcj.Width(); j+=blockHeight) {
for(uint32 i = 0; i < dcj.Height(); i+=blockWidth) {
const uint8 *blockPtr = dcj.InBuf() + blockIdx*16;