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Add specific function to convert from YUV420 to RGB

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jfmcarreira committed 2021-06-06 21:28:21 +01:00
1 parent 9e3fb9c0a0
commit f2a636baa1
1 file changed
+40 -3
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lib/CalypFrame.cpp
+40 -3
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@@ -780,8 +780,6 @@ void CalypFrame::frameToBuffer( ClpByte* output_buffer, int iEndianness )
}
}
void CalypFrame::fillRGBBuffer()
{
#define PEL_ARGB( a, r, g, b ) ( ( a & 0xff ) << 24 ) | ( ( r & 0xff ) << 16 ) | ( ( g & 0xff ) << 8 ) | ( b & 0xff )
#define PEL_RGB( r, g, b ) PEL_ARGB( 0xffu, r, g, b )
#define CLAMP_YUV2RGB( X ) X = X < 0 ? 0 : X > 255 ? 255 : \
@@ -794,10 +792,45 @@ void CalypFrame::fillRGBBuffer()
CLAMP_YUV2RGB( iG ) \
CLAMP_YUV2RGB( iB )
void fillRGBBufferYUV420p( ClpPel*** pppInputPel, uint32_t* pARGB, unsigned uiWidth, unsigned uiHeight, int shiftBits )
{
ClpPel* pY = pppInputPel[CLP_LUMA][0];
ClpPel* pU = pppInputPel[CLP_CHROMA_U][0];
ClpPel* pV = pppInputPel[CLP_CHROMA_V][0];
for( unsigned y = 0; y < uiHeight; y += 2 )
{
for( unsigned x = 0; x < uiWidth; x += 2 )
{
int iY, iU, iV, iR, iG, iB;
iY = pY[y * uiWidth + x] >> shiftBits;
iU = pU[y * uiWidth / 4 + x / 2] >> shiftBits;
iV = pV[y * uiWidth / 4 + x / 2] >> shiftBits;
YUV2RGB( iY, iU, iV, iR, iG, iB );
pARGB[y * uiWidth + x] = PEL_RGB( iR, iG, iB );
iY = pY[y * uiWidth + x + 1] >> shiftBits;
YUV2RGB( iY, iU, iV, iR, iG, iB );
pARGB[y * uiWidth + x + 1] = PEL_RGB( iR, iG, iB );
iY = pY[y * uiWidth + uiWidth + x] >> shiftBits;
YUV2RGB( iY, iU, iV, iR, iG, iB );
pARGB[y * uiWidth + uiWidth + x] = PEL_RGB( iR, iG, iB );
iY = pY[y * uiWidth + uiWidth + x + 1] >> shiftBits;
YUV2RGB( iY, iU, iV, iR, iG, iB );
pARGB[y * uiWidth + uiWidth + x + 1] = PEL_RGB( iR, iG, iB );
}
}
}
void CalypFrame::fillRGBBuffer()
{
if( d->m_bHasRGBPel )
return;
int shiftBits = d->m_uiBitsPel - 8;
d->m_bHasRGBPel = true;
// 4 bytes for A, R, G and B
uint32_t* pARGB = (uint32_t*)d->m_pcARGB32;
if( d->m_pcPelFormat->colorSpace == CLP_COLOR_GRAY )
@@ -829,6 +862,11 @@ void CalypFrame::fillRGBBuffer()
}
else if( d->m_pcPelFormat->colorSpace == CLP_COLOR_YUV )
{
if( d->m_iPixelFormat == CLP_YUV420P )
{
fillRGBBufferYUV420p( d->m_pppcInputPel, pARGB, d->m_uiWidth, d->m_uiHeight, shiftBits );
return;
}
ClpPel* pLineY = d->m_pppcInputPel[CLP_LUMA][0];
ClpPel* pLineU = d->m_pppcInputPel[CLP_CHROMA_U][0];
ClpPel* pLineV = d->m_pppcInputPel[CLP_CHROMA_V][0];
@@ -871,7 +909,6 @@ void CalypFrame::fillRGBBuffer()
pLineV += uiChromaStride;
}
}
d->m_bHasRGBPel = true;
}
/**