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Fix swapped channels in BGR* conversion utility function

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- some of `icvCvt_BGR*` functions have R with B channels
  swapped what leads to the wrong conversion
- renames misleading `rgb` variable name to `bgr`
- swap back the conversion coefficients, `cB` should be the first

Signed-off-by: Janusz Lisiecki <jlisiecki@nvidia.com>
This commit is contained in:
Janusz Lisiecki 2019-12-20 17:54:37 +01:00
parent 40ac72a8f1
commit 178c4810e6
1 changed files with 21 additions and 21 deletions
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42
modules/imgcodecs/src/utils.cpp
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@ -56,65 +56,65 @@ int validateToInt(size_t sz)
#define cG (int)(0.587*(1 << SCALE) + 0.5)
#define cB ((1 << SCALE) - cR - cG)
void icvCvt_BGR2Gray_8u_C3C1R( const uchar* rgb, int rgb_step,
void icvCvt_BGR2Gray_8u_C3C1R( const uchar* bgr, int bgr_step,
uchar* gray, int gray_step,
Size size, int _swap_rb )
{
int i;
for( ; size.height--; gray += gray_step )
{
short cRGB0 = cR;
short cRGB2 = cB;
if (_swap_rb) std::swap(cRGB0, cRGB2);
for( i = 0; i < size.width; i++, rgb += 3 )
short cBGR0 = cB;
short cBGR2 = cR;
if (_swap_rb) std::swap(cBGR0, cBGR2);
for( i = 0; i < size.width; i++, bgr += 3 )
{
int t = descale( rgb[0]*cRGB0 + rgb[1]*cG + rgb[2]*cRGB2, SCALE );
int t = descale( bgr[0]*cBGR0 + bgr[1]*cG + bgr[2]*cBGR2, SCALE );
gray[i] = (uchar)t;
}
rgb += rgb_step - size.width*3;
bgr += bgr_step - size.width*3;
}
}
void icvCvt_BGRA2Gray_16u_CnC1R( const ushort* rgb, int rgb_step,
void icvCvt_BGRA2Gray_16u_CnC1R( const ushort* bgr, int bgr_step,
ushort* gray, int gray_step,
Size size, int ncn, int _swap_rb )
{
int i;
for( ; size.height--; gray += gray_step )
{
short cRGB0 = cR;
short cRGB2 = cB;
if (_swap_rb) std::swap(cRGB0, cRGB2);
for( i = 0; i < size.width; i++, rgb += ncn )
short cBGR0 = cB;
short cBGR2 = cR;
if (_swap_rb) std::swap(cBGR0, cBGR2);
for( i = 0; i < size.width; i++, bgr += ncn )
{
int t = descale( rgb[0]*cRGB0 + rgb[1]*cG + rgb[2]*cRGB2, SCALE );
int t = descale( bgr[0]*cBGR0 + bgr[1]*cG + bgr[2]*cBGR2, SCALE );
gray[i] = (ushort)t;
}
rgb += rgb_step - size.width*ncn;
bgr += bgr_step - size.width*ncn;
}
}
void icvCvt_BGRA2Gray_8u_C4C1R( const uchar* rgba, int rgba_step,
void icvCvt_BGRA2Gray_8u_C4C1R( const uchar* bgra, int rgba_step,
uchar* gray, int gray_step,
Size size, int _swap_rb )
{
int i;
for( ; size.height--; gray += gray_step )
{
short cRGB0 = cR;
short cRGB2 = cB;
if (_swap_rb) std::swap(cRGB0, cRGB2);
for( i = 0; i < size.width; i++, rgba += 4 )
short cBGR0 = cB;
short cBGR2 = cR;
if (_swap_rb) std::swap(cBGR0, cBGR2);
for( i = 0; i < size.width; i++, bgra += 4 )
{
int t = descale( rgba[0]*cRGB0 + rgba[1]*cG + rgba[2]*cRGB2, SCALE );
int t = descale( bgra[0]*cBGR0 + bgra[1]*cG + bgra[2]*cBGR2, SCALE );
gray[i] = (uchar)t;
}
rgba += rgba_step - size.width*4;
bgra += rgba_step - size.width*4;
}
}