void Image::load(std::string const& path, float gamma)
{
int num_components;
stbi_ldr_to_hdr_gamma(gamma);
float *data = stbi_loadf(path.c_str(), &m_width, &m_height, &num_components, 4);
if(!data) {
std::cerr << "error: could not load image \"" << path << "\"" << std::endl;
return;
}
m_pixels.resize(m_width * m_height);
/* flip image in Y */
for(int y = 0; y < m_height; y++) {
memcpy(&m_pixels[(m_height - y - 1) * m_width],
data + y * m_width * 4,
4 * m_width * sizeof(float));
}
stbi_image_free(data);
}
/*
call-seq:
set_ldr_to_hdr_gamma(value) => value
ldr_to_hdr_gamma = value => value
Sets the LDR to HDR gamma used when loading LDR images with load_float_image.
*/
static VALUE sr_set_ldr_to_hdr_gamma(VALUE self, VALUE gamma)
{
stbi_ldr_to_hdr_gamma((float)NUM2DBL(gamma));
return gamma;
}