#include?
#include?“png/png.h“
#include?
using?namespace?std;

const?char?*png_file?=?“NoSignal.png“;

void?rgba_resize（int?src_width?int?src_height?int?dst_width?int?dst_height?uint8_t?*src_buf?uint8_t?*dst_buf）?{
????int?r_width?=?src_width?*?4;
????int?w_width?=?dst_width?*?4;
????for?（int?hnum?=?0;?hnum?????????for?（int?wnum?=?0;?wnum?????????????double?d_original_img_hnum?=?hnum?*?src_height?/?（double）?dst_height;
????????????double?d_original_img_wnum?=?wnum?*?src_width?/?（double）?dst_width;
????????????int?i_original_img_hnum?=?（int）?d_original_img_hnum;
????????????int?i_original_img_wnum?=?（int）?d_original_img_wnum;
????????????double?distance_to_a_x?=?d_original_img_wnum?-?i_original_img_wnum;//在原圖像中與a點的水平距離
????????????double?distance_to_a_y?=?d_original_img_hnum?-?i_original_img_hnum;//在原圖像中與a點的垂直距離

????????????int?original_point_a?=
????????????????????i_original_img_hnum?*?r_width?+?i_original_img_wnum?*?4;//數(shù)組位置偏移量，對應(yīng)于圖像的各像素點RGB的起點相當(dāng)于點A
????????????int?original_point_b?=
????????????????????i_original_img_hnum?*?r_width?+?（i_original_img_wnum?+?1）?*?4;//數(shù)組位置偏移量，對應(yīng)于圖像的各像素點RGB的起點相當(dāng)于點B
????????????int?original_point_c?=
????????????????????（i_original_img_hnum?+?1）?*?r_width?+?i_original_img_wnum?*?4;//數(shù)組位置偏移量，對應(yīng)于圖像的各像素點RGB的起點相當(dāng)于點C
????????????int?original_point_d?=
????????????????????（i_original_img_hnum?+?1）?*?r_width?+?（i_original_img_wnum?+?1）?*?4;//數(shù)組位置偏移量，對應(yīng)于圖像的各像素點RGB的起點相當(dāng)于點D
????????????if?（i_original_img_hnum?+?1?==?dst_width?-?1）?{
????????????????original_point_c?=?original_point_a;
????????????????original_point_d?=?original_point_b;
????????????}
????????????if?（i_original_img_wnum?+?1?==?dst_width?-?1）?{
????????????????original_point_b?=?original_point_a;
????????????????original_point_d?=?original_point_c;
????????????}

????????????int?pixel_point?=?hnum?*?w_width?+?wnum?*?4;//映射尺度變換圖像數(shù)組位置偏移量
????????????dst_buf[pixel_point]?=
????????????????????（uint8_t）?（src_buf[original_point_a]?*?（1?-?distance_to_a_x）?*?（1?-?distance_to_a_y）?+
???????????????????????????????src_buf[original_point_b]?*?distance_to_a_x?*?（1?-?distance_to_a_y）?+
???????????????????????????????src_buf[original_point_c]?*?distance_to_a_y?*?（1?-?distance_to_a_x）?+
???????????????????????????????src_buf[original_point_d]?*?distance_to_a_y?*?distance_to_a_x）;
????????????dst_buf[pixel_point?+?1]?=
????????????????????（uint8_t）?（src_buf[original_point_a?+?1]?*?（1?-?distance_to_a_x）?*?（1?-?distance_to_a_y）?+
???????????????????????????????src_buf[original_point_b?+?1]?*?distance_to_a_x?*?（1?-?distance_to_a_y）?+
???????????????????????????????src_buf[original_point_c?+?1]?*?distance_to_a_y?*?（1?-?distance_to_a_x）?+
???????????????????????????????src_buf[original_point_d?+?1]?*?distance_to_a_y?*?distance_to_a_x）;
????????????dst_buf[pixel_point?+?2]?=
????????????????????（uint8_t）?（src_buf[original_point_a?+?2]?*?（1?-?distance_to_a_x）?*?（1?-?distance_to_a_y）?+
??????????????????????????