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clean up comments

This commit is contained in:
Jeff Roberts (Bellevue) 2024-02-08 10:36:54 -08:00
parent 7a075fe7c7
commit 7f7e3469cf
1 changed files with 29 additions and 19 deletions
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48
stb_image_resize2.h
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@ -3202,8 +3202,8 @@ static void stbir__calculate_in_pixel_range( int * first_pixel, int * last_pixel
if ( edge == STBIR_EDGE_WRAP )
{
if ( first <= -input_size )
first = -(input_size-1);
if ( first < -input_size )
first = -input_size;
if ( last >= (input_size*2))
last = (input_size*2) - 1;
}
@ -3562,7 +3562,7 @@ static void stbir__cleanup_gathered_coefficients( stbir_edge edge, stbir__filter
filter_info->widest = widest;
}
static int stbir__pack_coefficients( int num_contributors, stbir__contributors* contributors, float * coefficents, int coefficient_width, int widest, int row_width )
static int stbir__pack_coefficients( int num_contributors, stbir__contributors* contributors, float * coefficents, int coefficient_width, int widest, int row0, int row1 )
{
#define STBIR_MOVE_1( dest, src ) { STBIR_NO_UNROLL(dest); ((stbir_uint32*)(dest))[0] = ((stbir_uint32*)(src))[0]; }
#define STBIR_MOVE_2( dest, src ) { STBIR_NO_UNROLL(dest); ((stbir_uint64*)(dest))[0] = ((stbir_uint64*)(src))[0]; }
@ -3571,6 +3571,9 @@ static int stbir__pack_coefficients( int num_contributors, stbir__contributors*
#else
#define STBIR_MOVE_4( dest, src ) { STBIR_NO_UNROLL(dest); ((stbir_uint64*)(dest))[0] = ((stbir_uint64*)(src))[0]; ((stbir_uint64*)(dest))[1] = ((stbir_uint64*)(src))[1]; }
#endif
int row_end = row1 + 1;
if ( coefficient_width != widest )
{
float * pc = coefficents;
@ -3712,10 +3715,10 @@ static int stbir__pack_coefficients( int num_contributors, stbir__contributors*
float * coeffs = coefficents + widest * ( num_contributors - 1 );
// go until no chance of clipping (this is usually less than 8 lops)
while ( ( contribs >= contributors ) && ( ( contribs->n0 + widest*2 ) >= row_width ) )
while ( ( contribs >= contributors ) && ( ( contribs->n0 + widest*2 ) >= row_end ) )
{
// might we clip??
if ( ( contribs->n0 + widest ) > row_width )
if ( ( contribs->n0 + widest ) > row_end )
{
int stop_range = widest;
@ -3734,15 +3737,15 @@ static int stbir__pack_coefficients( int num_contributors, stbir__contributors*
}
// now see if we still clip with the refined range
if ( ( contribs->n0 + stop_range ) > row_width )
if ( ( contribs->n0 + stop_range ) > row_end )
{
int new_n0 = row_width - stop_range;
int new_n0 = row_end - stop_range;
int num = contribs->n1 - contribs->n0 + 1;
int backup = contribs->n0 - new_n0;
float * from_co = coeffs + num - 1;
float * to_co = from_co + backup;
STBIR_ASSERT( ( new_n0 >= 0 ) && ( new_n0 < contribs->n0 ) );
STBIR_ASSERT( ( new_n0 >= row0 ) && ( new_n0 < contribs->n0 ) );
// move the coeffs over
while( num )
@ -6354,24 +6357,31 @@ static void stbir__set_sampler(stbir__sampler * samp, stbir_filter filter, stbir
// pre calculate stuff based on the above
samp->coefficient_width = stbir__get_coefficient_width(samp, samp->is_gather, user_data);
// don't double reflect on edges (happens on 2 pixel to 1 pixel output)
if ( samp->filter_pixel_width > ( scale_info->input_full_size * 3 ) )
samp->filter_pixel_width = scale_info->input_full_size * 3;
// filter_pixel_width is the conservative size in pixels of input that affect an output pixel.
// In rare cases (only with 2 pix to 1 pix with the default filters), it's possible that the
// filter will extend before or after the scanline beyond just one extra entire copy of the
// scanline (we would hit the edge twice). We don't let you do that, so we clamp the total
// width to 3x the total of input pixel (once for the scanline, once for the left side
// overhang, and once for the right side). We only do this for edge mode, since the other
// modes can just re-edge clamp back in again.
if ( edge == STBIR_EDGE_WRAP )
if ( samp->filter_pixel_width > ( scale_info->input_full_size * 3 ) )
samp->filter_pixel_width = scale_info->input_full_size * 3;
// This is how much to expand buffers to account for filters seeking outside
// the image boundaries.
samp->filter_pixel_margin = samp->filter_pixel_width / 2;
// again, no double reflect
if ( samp->filter_pixel_margin > scale_info->input_full_size )
samp->filter_pixel_margin = scale_info->input_full_size;
// filter_pixel_margin is the amount that this filter can overhang on just one side of either
// end of the scanline (left or the right). Since we only allow you to overhang 1 scanline's
// worth of pixels, we clamp this one side of overhang to the input scanline size. Again,
// this clamping only happens in rare cases with the default filters (2 pix to 1 pix).
if ( edge == STBIR_EDGE_WRAP )
if ( samp->filter_pixel_margin > scale_info->input_full_size )
samp->filter_pixel_margin = scale_info->input_full_size;
samp->num_contributors = stbir__get_contributors(samp, samp->is_gather);
// again, no double reflect
if ( samp->num_contributors > ( scale_info->input_full_size * 3 ) )
samp->num_contributors = scale_info->input_full_size * 3;
samp->contributors_size = samp->num_contributors * sizeof(stbir__contributors);
samp->coefficients_size = samp->num_contributors * samp->coefficient_width * sizeof(float) + sizeof(float); // extra sizeof(float) is padding
@ -7007,7 +7017,7 @@ static stbir__info * stbir__alloc_internal_mem_and_build_samplers( stbir__sample
stbir__get_extents( horizontal, &info->scanline_extents );
// pack the horizontal coeffs
horizontal->coefficient_width = stbir__pack_coefficients(horizontal->num_contributors, horizontal->contributors, horizontal->coefficients, horizontal->coefficient_width, horizontal->extent_info.widest, info->scanline_extents.conservative.n1 + 1 );
horizontal->coefficient_width = stbir__pack_coefficients(horizontal->num_contributors, horizontal->contributors, horizontal->coefficients, horizontal->coefficient_width, horizontal->extent_info.widest, info->scanline_extents.conservative.n0, info->scanline_extents.conservative.n1 );
STBIR_MEMCPY( &info->horizontal, horizontal, sizeof( stbir__sampler ) );