void
metric_generate_coeffs_for_subimage (coeffs_union_t *coeffs, bitmap_t *bitmap,
int x, int y, int width, int height, metric_t *metric)
{
if (metric->kind == METRIC_SUBPIXEL)
{
bitmap_t *sub_bitmap, *scaled_bitmap;
sub_bitmap = bitmap_sub(bitmap, x, y, width, height);
assert(sub_bitmap != 0);
//bitmap_write(sub_bitmap, "/tmp/sub.png");
scaled_bitmap = bitmap_scale(sub_bitmap, NUM_SUBPIXEL_ROWS_COLS, NUM_SUBPIXEL_ROWS_COLS, FILTER_MITCHELL);
assert(scaled_bitmap != 0);
bitmap_free(sub_bitmap);
//bitmap_write(scaled_bitmap, "/tmp/scaled.png");
assert(scaled_bitmap->color == COLOR_RGB_8);
assert(scaled_bitmap->pixel_stride == NUM_CHANNELS);
assert(scaled_bitmap->row_stride == NUM_SUBPIXEL_ROWS_COLS * NUM_CHANNELS);
color_convert_rgb_pixels(coeffs->subpixel.subpixels, scaled_bitmap->data,
NUM_SUBPIXELS, metric->color_space);
bitmap_free(scaled_bitmap);
}
else
assert(0);
}
static PComputeStatus compute_sub(PPInput *input, PPOutput output, void *state)
{
PINode *a, *b;
real64 c, d;
if(collect_inputs(input, &a, &b, &c, &d, V_NT_BITMAP))
return bitmap_sub(a, b, c, d, output);
else if(collect_inputs(input, &a, &b, &c, &d, INPUT_OBJECT_WITH_GEOMETRY))
return geometry_sub(a, b, c, d, output);
else
p_output_real64(output, c - d);
return P_COMPUTE_DONE;
}