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hist hacking

This commit is contained in:
John Cupitt 2010-03-25 21:21:40 +00:00
parent ef2a5d0c8c
commit 001bd943eb
1 changed files with 17 additions and 15 deletions
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32
libvips/histograms_lut/tone.c
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@ -77,7 +77,7 @@
* - patched for im_extract_band() change
* 11/7/04
* - generalised to im_tone_build_range() ... so you can use it for any
* image ,not just LabS
* image, not just LabS
*/
/*
@ -219,13 +219,14 @@ im_tone_build_range( IMAGE *out,
double Ps, double Pm, double Ph,
double S, double M, double H )
{
ToneShape *ts = IM_NEW( out, ToneShape );
ToneShape *ts;
unsigned short lut[65536];
int i;
/* Check args.
*/
if( !ts || im_outcheck( out ) )
if( !(ts = IM_NEW( out, ToneShape )) ||
im_outcheck( out ) )
return( -1 );
if( in_max < 0 || in_max > 65535 ||
out_max < 0 || out_max > 65535 ) {
@ -307,6 +308,7 @@ im_tone_build_range( IMAGE *out,
IM_CODING_NONE, IM_TYPE_HISTOGRAM, 1.0, 1.0, 0, 0 );
if( im_setupout( out ) )
return( -1 );
if( im_writeline( 0, out, (PEL *) lut ) )
return( -1 );
@ -319,9 +321,9 @@ im_tone_build( IMAGE *out,
double Ps, double Pm, double Ph,
double S, double M, double H )
{
IMAGE *t1 = im_open_local( out, "im_tone_build", "p" );
IMAGE *t1;
if( !t1 ||
if( !(t1 = im_open_local( out, "im_tone_build", "p" )) ||
im_tone_build_range( t1, 1023, 32767,
Lb, Lw, Ps, Pm, Ph, S, M, H ) ||
im_clip2fmt( t1, out, IM_BANDFMT_SHORT ) )
@ -335,12 +337,11 @@ im_tone_build( IMAGE *out,
int
im_ismonotonic( IMAGE *lut, int *out )
{
IMAGE *t1 = im_open_local( lut, "im_ismonotonic:1", "p" );
IMAGE *t2 = im_open_local( lut, "im_ismonotonic:2", "p" );
IMAGE *t3 = im_open_local( lut, "im_ismonotonic:3", "p" );
IMAGE *t[3];
double m;
if( !t1 || !t2 || !t3 )
if( im_open_local_array( lut, t, 3, "im_ismonotonic", "p" ) ||
im_check_hist( "im_ismonotonic", lut ) )
return( -1 );
/* Can be either a horizontal or vertical LUT.
@ -354,21 +355,22 @@ im_ismonotonic( IMAGE *lut, int *out )
/* Extract two areas, offset by 1 pixel.
*/
if( lut->Xsize == 1 ) {
if( im_extract_area( lut, t1, 0, 0, 1, lut->Ysize - 1 ) ||
im_extract_area( lut, t2, 0, 1, 1, lut->Ysize - 1 ) )
if( im_extract_area( lut, t[0], 0, 0, 1, lut->Ysize - 1 ) ||
im_extract_area( lut, t[1], 0, 1, 1, lut->Ysize - 1 ) )
return( -1 );
}
else {
if( im_extract_area( lut, t1, 0, 0, lut->Xsize - 1, 1 ) ||
im_extract_area( lut, t2, 1, 0, lut->Xsize - 1, 1 ) )
if( im_extract_area( lut, t[0], 0, 0, lut->Xsize - 1, 1 ) ||
im_extract_area( lut, t[1], 1, 0, lut->Xsize - 1, 1 ) )
return( -1 );
}
/* Now t2 should be >= than t1 everywhere!
*/
if( im_moreeq( t2, t1, t3 ) || im_min( t3, &m ) )
if( im_moreeq( t[1], t[0], t[2] ) ||
im_min( t[2], &m ) )
return( -1 );
*out = m;
return( 0 );