overlay_alpha.hpp

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#pragma once
 
#include <cstddef> // size_t
#include <cstdint> // uint8_t
 
#include <alpha-lib/rescale_type.hpp>
 
 
template <RescaleType rescale_type = RescaleType::Div255_Round>
void overlay_alpha_fast(const uint8_t *bg_img, const uint8_t *fg_img,
                        uint8_t *out_img, size_t n);
 
template <RescaleType rescale_type = RescaleType::Div255_Round>
void overlay_alpha_stride(const uint8_t *bg_img, const uint8_t *fg_img,
                          uint8_t *out_img, size_t bg_full_cols, size_t fg_rows,
                          size_t fg_cols, size_t fg_full_cols);
 
inline void overlay_alpha_stride(const uint8_t (&bg_img)[4],
                                 const uint8_t (&fg_img)[4],
                                 uint8_t (&out_img)[4], size_t bg_full_cols,
                                 size_t fg_rows, size_t fg_cols,
                                 size_t fg_full_cols) {
    overlay_alpha_stride(&bg_img[0], &fg_img[0], &out_img[0], bg_full_cols,
                         fg_rows, fg_cols, fg_full_cols);
}
 
/// @}