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path: root/vcl/source/bitmap/BitmapTools.cxx
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Diffstat (limited to 'vcl/source/bitmap/BitmapTools.cxx')
-rw-r--r--vcl/source/bitmap/BitmapTools.cxx123
1 files changed, 84 insertions, 39 deletions
diff --git a/vcl/source/bitmap/BitmapTools.cxx b/vcl/source/bitmap/BitmapTools.cxx
index 317ef0495195..4bac9745795e 100644
--- a/vcl/source/bitmap/BitmapTools.cxx
+++ b/vcl/source/bitmap/BitmapTools.cxx
@@ -268,6 +268,7 @@ BitmapEx* CreateFromCairoSurface(Size aSize, cairo_surface_t * pSurface)
cairo_surface_flush(pPixels);
unsigned char *pSrc = cairo_image_surface_get_data( pPixels );
unsigned int nStride = cairo_image_surface_get_stride( pPixels );
+ vcl::bitmap::lookup_table unpremultiply_table = vcl::bitmap::get_unpremultiply_table();
for( unsigned long y = 0; y < static_cast<unsigned long>(aSize.Height()); y++ )
{
sal_uInt32 *pPix = reinterpret_cast<sal_uInt32 *>(pSrc + nStride * y);
@@ -287,9 +288,9 @@ BitmapEx* CreateFromCairoSurface(Size aSize, cairo_surface_t * pSurface)
if( nAlpha != 0 && nAlpha != 255 )
{
// Cairo uses pre-multiplied alpha - we do not => re-multiply
- nR = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nR) * 255) / nAlpha, 0, 255 ));
- nG = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nG) * 255) / nAlpha, 0, 255 ));
- nB = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nB) * 255) / nAlpha, 0, 255 ));
+ nR = unpremultiply_table[nAlpha][nR];
+ nG = unpremultiply_table[nAlpha][nG];
+ nB = unpremultiply_table[nAlpha][nB];
}
pRGBWrite->SetPixel( y, x, BitmapColor( nR, nG, nB ) );
pMaskWrite->SetPixelIndex( y, x, 255 - nAlpha );
@@ -726,6 +727,7 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
::Color aColor;
unsigned int nAlpha = 255;
+ vcl::bitmap::lookup_table premultiply_table = vcl::bitmap::get_premultiply_table();
for( nY = 0; nY < nHeight; nY++ )
{
::Scanline pReadScan;
@@ -754,13 +756,13 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
aColor = pBitmapReadAcc->GetPaletteColor(*pReadScan++).GetColor();
#ifdef OSL_BIGENDIAN
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( aColor.GetRed() ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( aColor.GetGreen() ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( aColor.GetBlue() ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
#else
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( aColor.GetBlue() ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( aColor.GetGreen() ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( aColor.GetRed() ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
nOff++;
#endif
}
@@ -778,18 +780,18 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
nAlpha = data[ nOff ];
else
nAlpha = data[ nOff ] = 255;
- data[ nOff + 3 ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff + 2 ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff + 1 ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
+ data[ nOff + 3 ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff + 2 ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff + 1 ] = premultiply_table[nAlpha][*pReadScan++];
nOff += 4;
#else
if( pAlphaReadAcc )
nAlpha = data[ nOff + 3 ];
else
nAlpha = data[ nOff + 3 ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
nOff++;
#endif
}
@@ -807,17 +809,17 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
nAlpha = data[ nOff++ ];
else
nAlpha = data[ nOff++ ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
#else
if( pAlphaReadAcc )
nAlpha = data[ nOff + 3 ];
else
nAlpha = data[ nOff + 3 ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 2 ] ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 1 ] ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 0 ] ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 2 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 1 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 0 ]];
pReadScan += 3;
nOff++;
#endif
@@ -836,18 +838,18 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
nAlpha = data[ nOff++ ];
else
nAlpha = data[ nOff++ ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 2 ] ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 1 ] ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 0 ] ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 2 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 1 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 0 ]];
pReadScan += 4;
#else
if( pAlphaReadAcc )
nAlpha = data[ nOff + 3 ];
else
nAlpha = data[ nOff + 3 ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
pReadScan++;
nOff++;
#endif
@@ -866,18 +868,18 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
nAlpha = data[ nOff ++ ];
else
nAlpha = data[ nOff ++ ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( *pReadScan++ ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
+ data[ nOff++ ] = premultiply_table[nAlpha][*pReadScan++];
pReadScan++;
#else
if( pAlphaReadAcc )
nAlpha = data[ nOff + 3 ];
else
nAlpha = data[ nOff + 3 ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 2 ] ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 1 ] ) )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*( pReadScan[ 0 ] ) )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 2 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 1 ]];
+ data[ nOff++ ] = premultiply_table[nAlpha][pReadScan[ 0 ]];
pReadScan += 4;
nOff++;
#endif
@@ -901,17 +903,17 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
nAlpha = data[ nOff++ ];
else
nAlpha = data[ nOff++ ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*aColor.GetRed() )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*aColor.GetGreen() )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*aColor.GetBlue() )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
#else
if( pAlphaReadAcc )
nAlpha = data[ nOff + 3 ];
else
nAlpha = data[ nOff + 3 ] = 255;
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*aColor.GetBlue() )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*aColor.GetGreen() )/255 );
- data[ nOff++ ] = sal::static_int_cast<unsigned char>(( nAlpha*aColor.GetRed() )/255 );
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetBlue()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetGreen()];
+ data[ nOff++ ] = premultiply_table[nAlpha][aColor.GetRed()];
nOff ++;
#endif
}
@@ -1044,6 +1046,49 @@ void CanvasCairoExtractBitmapData( BitmapEx const & aBmpEx, Bitmap & aBitmap, un
return bRet;
}
+ static sal_uInt8 unpremultiply(sal_uInt8 c, sal_uInt8 a)
+ {
+ return (a == 0) ? 0 : (c * 255 + a / 2) / a;
+ }
+
+ static sal_uInt8 premultiply(sal_uInt8 c, sal_uInt8 a)
+ {
+ return (c * a + 127) / 255;
+ }
+
+ lookup_table get_unpremultiply_table()
+ {
+ static bool inited;
+ static sal_uInt8 unpremultiply_table[256][256];
+
+ if (!inited)
+ {
+ for (int a = 0; a < 256; ++a)
+ for (int c = 0; c < 256; ++c)
+ unpremultiply_table[a][c] = unpremultiply(c, a);
+ inited = true;
+ }
+
+ return unpremultiply_table;
+ }
+
+ lookup_table get_premultiply_table()
+ {
+ static bool inited;
+ static sal_uInt8 premultiply_table[256][256];
+
+ if (!inited)
+ {
+ for (int a = 0; a < 256; ++a)
+ for (int c = 0; c < 256; ++c)
+ premultiply_table[a][c] = premultiply(c, a);
+ inited = true;
+ }
+
+ return premultiply_table;
+ }
+
+
}} // end vcl::bitmap
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
generated by cgit (git 2.34.1) at 2024-12-26 14:24:26 +0000