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Fix nonuniform downsampling.

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This commit is contained in:
Jorge Rodriguez 2014-07-24 22:30:35 -07:00
parent fa69bc8551
commit dbb7480f12
1 changed files with 3 additions and 5 deletions
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8
stb_resample.h
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@ -309,12 +309,10 @@ static void stbr__calculate_coefficients_upsample(stbr__info* stbr_info, int in_
coefficient_group[i] *= filter_scale;
}
static void stbr__calculate_coefficients_downsample(stbr__info* stbr_info, int out_first_texel, int out_last_texel, float out_center_of_in, int n, stbr__contributors* contributor, float* coefficient_group)
static void stbr__calculate_coefficients_downsample(stbr__info* stbr_info, float scale_ratio, int out_first_texel, int out_last_texel, float out_center_of_in, int n, stbr__contributors* contributor, float* coefficient_group)
{
int i;
float scale_ratio = (float)stbr_info->output_w / stbr_info->input_w;
STBR_DEBUG_ASSERT(out_last_texel - out_first_texel <= stbr_info->kernel_texel_width);
STBR_DEBUG_ASSERT(out_first_texel >= 0);
STBR_DEBUG_ASSERT(out_last_texel < stbr_info->total_horizontal_contributors);
@ -365,7 +363,7 @@ static void stbr__calculate_horizontal_filters(stbr__info* stbr_info)
stbr__calculate_sample_range_downsample(n, in_pixels_radius, scale_ratio, &out_first_texel, &out_last_texel, &out_center_of_in);
stbr__calculate_coefficients_downsample(stbr_info, out_first_texel, out_last_texel, out_center_of_in, n, stbr__get_contributor(stbr_info, n), stbr__get_coefficient(stbr_info, n, 0));
stbr__calculate_coefficients_downsample(stbr_info, scale_ratio, out_first_texel, out_last_texel, out_center_of_in, n, stbr__get_contributor(stbr_info, n), stbr__get_coefficient(stbr_info, n, 0));
}
}
}
@ -633,7 +631,7 @@ static void stbr__resample_vertical_downsample(stbr__info* stbr_info, int n, int
int ring_buffer_last_scanline = stbr_info->ring_buffer_last_scanline;
int ring_buffer_length = stbr_info->ring_buffer_length;
stbr__calculate_coefficients_downsample(stbr_info, in_first_scanline, in_last_scanline, in_center_of_out, n, vertical_contributors, vertical_coefficients);
stbr__calculate_coefficients_downsample(stbr_info, (float)stbr_info->output_h / stbr_info->input_h, in_first_scanline, in_last_scanline, in_center_of_out, n, vertical_contributors, vertical_coefficients);
int n0 = vertical_contributors->n0;
int n1 = vertical_contributors->n1;