{"id":200,"date":"2026-04-05T23:15:59","date_gmt":"2026-04-05T15:15:59","guid":{"rendered":"http:\/\/www.millscience.cn\/?p=200"},"modified":"2026-04-05T23:17:46","modified_gmt":"2026-04-05T15:17:46","slug":"bmp","status":"publish","type":"post","link":"https:\/\/www.millscience.cn\/index.php\/bmp\/","title":{"rendered":"\u5c06\u4e00\u4e2abmp\u56fe\u7247\u7f29\u5c0f\u4e3a\u539f\u6765\u7684\u4e8c\u5206\u4e4b\u4e00"},"content":{"rendered":"\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(3 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"\u590d\u5236\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>#include &lt;stdio.h>\n#include &lt;stdint.h>\n#include &lt;stdlib.h>\n\n#pragma pack(push, 1)\ntypedef struct\n{\n    uint16_t bfType;\n    uint32_t bfSize;\n    uint16_t bfReserved1;\n    uint16_t bfReserved2;\n    uint32_t bfOffBits;\n} BITMAPFILEHEADER;\n\ntypedef struct\n{\n    uint32_t biSize;\n    int32_t biWidth;\n    int32_t biHeight;\n    uint16_t biPlanes;\n    uint16_t biBitCount;\n    uint32_t biCompression;\n    uint32_t biSizeImage;\n    int32_t biXPelsPerMeter;\n    int32_t biYPelsPerMeter;\n    uint32_t biClrUsed;\n    uint32_t biClrImportant;\n} BITMAPINFOHEADER;\n#pragma pack(pop)\n\nint main(int argc, const char *argv[])\n{\n    if (argc != 3)\n    {\n        printf(\"\u7528\u6cd5: %s &lt;\u8f93\u5165BMP> &lt;\u8f93\u51faBMP>\\n\", argv&#91;0&#93;);\n        return -1;\n    }\n\n    FILE *in = fopen(argv&#91;1&#93;, \"rb\");\n    if (!in)\n    {\n        perror(\"\u6253\u5f00\u8f93\u5165\u6587\u4ef6\u5931\u8d25\");\n        return -1;\n    }\n\n    BITMAPFILEHEADER fh;\n    BITMAPINFOHEADER ih;\n    fread(&amp;fh, 1, sizeof(fh), in);\n    fread(&amp;ih, 1, sizeof(ih), in);\n\n    \/\/ \u4ec5\u5904\u7406 24 \u4f4d\u65e0\u538b\u7f29 BMP\n    if (ih.biBitCount != 24 || ih.biCompression != 0)\n    {\n        printf(\"\u4ec5\u652f\u6301 24 \u4f4d\u672a\u538b\u7f29 BMP\\n\");\n        fclose(in);\n        return -1;\n    }\n\n    int old_width = ih.biWidth;\n    int old_height = ih.biHeight;\n    int old_bitcount = ih.biBitCount;\n\n  \/\/ ... \u524d\u9762\u7684\u4ee3\u7801\u4e0d\u53d8 (\u76f4\u5230\u8ba1\u7b97\u51fa old_row_size) ...\n\n    int old_row_size = ((old_width * old_bitcount + 31) \/ 32) * 4;\n    int old_pixel_size = old_row_size * old_height; \/\/ \u539f\u56fe\u6570\u636e\u603b\u5927\u5c0f\n\n    \/\/ 1. \u3010\u65b0\u589e\u3011\u628a\u539f\u56fe\u5b8c\u6574\u8bfb\u5230\u5185\u5b58\u4e2d\n    unsigned char *old_pixels = (unsigned char *)malloc(old_pixel_size);\n    if (!old_pixels) {\n        perror(\"\u539f\u56fe\u5185\u5b58\u5206\u914d\u5931\u8d25\");\n        return -1;\n    }\n    fseek(in, fh.bfOffBits, SEEK_SET);\n    fread(old_pixels, 1, old_pixel_size, in);\n\n    \/\/ \u65b0\u56fe\u50cf\u5c3a\u5bf8\u8ba1\u7b97 (\u4f60\u7684\u4ee3\u7801)\n    int new_width = old_width \/ 2;\n    int new_height = old_height \/ 2;\n    int new_row_size = ((new_width * 24 + 31) \/ 32) * 4;\n    int new_pixel_size = new_row_size * new_height;\n\n    \/\/ \u5206\u914d\u65b0\u50cf\u7d20\u7f13\u51b2\u533a (\u4f60\u7684\u4ee3\u7801)\n    unsigned char *new_pixels = (unsigned char *)calloc(new_pixel_size, 1);\n    if (!new_pixels) {\n        perror(\"\u5185\u5b58\u5206\u914d\u5931\u8d25\");\n        return -1;\n    }\n\n    \/\/ 2. \u3010\u6838\u5fc3\u4fee\u6539\u3011\u4e8c\u7ef4\u5750\u6807\u6620\u5c04 (\u6700\u8fd1\u90bb\u63d2\u503c\u6cd5\u7f29\u653e)\n    \/\/ \u904d\u5386\u65b0\u56fe\u7684\u6bcf\u4e00\u4e2a\u50cf\u7d20\u70b9\n    for (int y = 0; y &lt; new_height; y++) \n    {\n        for (int x = 0; x &lt; new_width; x++) \n        {\n            \/\/ \u8ba1\u7b97\u5f53\u524d\u65b0\u50cf\u7d20\u5728 new_pixels \u6570\u7ec4\u91cc\u7684\u8d77\u59cb\u4f4d\u7f6e\n            \/\/ \u516c\u5f0f\uff1a\u5f53\u524d\u884c\u6570 * \u65b0\u884c\u5bbd + \u5f53\u524d\u5217\u6570 * 3\n            int new_index = y * new_row_size + x * 3;\n\n            \/\/ \u8ba1\u7b97\u8fd9\u4e2a\u70b9\u5bf9\u5e94\u5728\u539f\u56fe\u4e2d\u7684\u4f4d\u7f6e\n            \/\/ \u56e0\u4e3a\u7f29\u5c0f\u4e862\u500d\uff0c\u6240\u4ee5\u53bb\u539f\u56fe\u91cc\u627e (x*2, y*2) \u8fd9\u4e2a\u5750\u6807\u7684\u50cf\u7d20\n            int old_x = x * 2;\n            int old_y = y * 2;\n            int old_index = old_y * old_row_size + old_x * 3;\n\n            \/\/ \u628a\u539f\u56fe\u7684 B, G, R \u590d\u5236\u5230\u65b0\u56fe\n            new_pixels&#91;new_index&#93;     = old_pixels&#91;old_index&#93;;     \/\/ B\n            new_pixels&#91;new_index + 1&#93; = old_pixels&#91;old_index + 1&#93;; \/\/ G\n            new_pixels&#91;new_index + 2&#93; = old_pixels&#91;old_index + 2&#93;; \/\/ R\n        }\n    }\n\n    \/\/ ... \u540e\u9762\u6784\u5efa new_fh, new_ih \u5e76\u5199\u5165\u6587\u4ef6\u7684\u4ee3\u7801\u4e0d\u53d8 ...\n    \n    \/\/ \u8bb0\u5f97\u6700\u540e\u91ca\u653e\u65b0\u5206\u914d\u7684 old_pixels\n    free(old_pixels);\n\n\n\n    \/\/ \u6784\u5efa\u65b0\u6587\u4ef6\u5934\u548c\u4fe1\u606f\u5934\n    BITMAPFILEHEADER new_fh;\n    BITMAPINFOHEADER new_ih;\n\n    new_fh.bfType = 0x4D42;\n    new_fh.bfSize = sizeof(new_fh) + sizeof(new_ih) + new_pixel_size;\n    new_fh.bfReserved1 = 0;\n    new_fh.bfReserved2 = 0;\n    new_fh.bfOffBits = sizeof(new_fh) + sizeof(new_ih);\n\n    new_ih.biSize = sizeof(new_ih);\n    new_ih.biWidth = new_width;\n    new_ih.biHeight = new_height; \/\/ \u4fdd\u6301\u4e0e\u539f\u56fe\u76f8\u540c\u7684\u7b26\u53f7\uff08\u6b63\u6570\uff09\n    new_ih.biPlanes = 1;\n    new_ih.biBitCount = 24;\n    new_ih.biCompression = 0;\n    new_ih.biSizeImage = new_pixel_size;\n    new_ih.biXPelsPerMeter = ih.biXPelsPerMeter; \/\/ \u4fdd\u6301\u539f\u5206\u8fa8\u7387\u6216\u586b\u9ed8\u8ba4\u503c\n    new_ih.biYPelsPerMeter = ih.biYPelsPerMeter;\n    new_ih.biClrUsed = 0;\n    new_ih.biClrImportant = 0;\n\n    FILE *out = fopen(argv&#91;2&#93;, \"wb\");\n    if (!out)\n    {\n        perror(\"\u521b\u5efa\u8f93\u51fa\u6587\u4ef6\u5931\u8d25\");\n        free(new_pixels);\n        return -1;\n    }\n\n    fwrite(&amp;new_fh, 1, sizeof(new_fh), out);\n    fwrite(&amp;new_ih, 1, sizeof(new_ih), out);\n    fwrite(new_pixels, 1, new_pixel_size, out);\n\n    fclose(out);\n    free(new_pixels);\n\n    printf(\"\u7f29\u5c0f\u4e00\u534a\u7684\u56fe\u50cf\u5df2\u751f\u6210: %s\\n\", argv&#91;2&#93;);\n    return 0;\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdio.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdint.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;stdlib.h&gt;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#pragma<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #9CDCFE\">pack<\/span><span style=\"color: #569CD6\">(<\/span><span style=\"color: #9CDCFE\">push<\/span><span style=\"color: #569CD6\">, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #569CD6\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">typedef<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">struct<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint16_t<\/span><span style=\"color: #D4D4D4\"> bfType;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> bfSize;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint16_t<\/span><span style=\"color: #D4D4D4\"> bfReserved1;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint16_t<\/span><span style=\"color: #D4D4D4\"> bfReserved2;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> bfOffBits;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">} BITMAPFILEHEADER;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">typedef<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">struct<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> biSize;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int32_t<\/span><span style=\"color: #D4D4D4\"> biWidth;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int32_t<\/span><span style=\"color: #D4D4D4\"> biHeight;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint16_t<\/span><span style=\"color: #D4D4D4\"> biPlanes;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint16_t<\/span><span style=\"color: #D4D4D4\"> biBitCount;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> biCompression;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> biSizeImage;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int32_t<\/span><span style=\"color: #D4D4D4\"> biXPelsPerMeter;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int32_t<\/span><span style=\"color: #D4D4D4\"> biYPelsPerMeter;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> biClrUsed;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">uint32_t<\/span><span style=\"color: #D4D4D4\"> biClrImportant;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">} BITMAPINFOHEADER;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#pragma<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #9CDCFE\">pack<\/span><span style=\"color: #569CD6\">(<\/span><span style=\"color: #9CDCFE\">pop<\/span><span style=\"color: #569CD6\">)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">main<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">argc<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #569CD6\">[]<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (argc != <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u7528\u6cd5: <\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\"> &lt;\u8f93\u5165BMP&gt; &lt;\u8f93\u51faBMP&gt;<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    FILE *in = <\/span><span style=\"color: #DCDCAA\">fopen<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">&#93;, <\/span><span style=\"color: #CE9178\">&quot;rb&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (!in)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">perror<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u6253\u5f00\u8f93\u5165\u6587\u4ef6\u5931\u8d25&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    BITMAPFILEHEADER fh;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    BITMAPINFOHEADER ih;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fread<\/span><span style=\"color: #D4D4D4\">(&amp;fh, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(fh), in);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fread<\/span><span style=\"color: #D4D4D4\">(&amp;ih, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(ih), in);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u4ec5\u5904\u7406 24 \u4f4d\u65e0\u538b\u7f29 BMP<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biBitCount<\/span><span style=\"color: #D4D4D4\"> != <\/span><span style=\"color: #B5CEA8\">24<\/span><span style=\"color: #D4D4D4\"> || <\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biCompression<\/span><span style=\"color: #D4D4D4\"> != <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u4ec5\u652f\u6301 24 \u4f4d\u672a\u538b\u7f29 BMP<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(in);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_width = <\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biWidth<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_height = <\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biHeight<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_bitcount = <\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biBitCount<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  <\/span><span style=\"color: #6A9955\">\/\/ ... \u524d\u9762\u7684\u4ee3\u7801\u4e0d\u53d8 (\u76f4\u5230\u8ba1\u7b97\u51fa old_row_size) ...<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_row_size = ((old_width * old_bitcount + <\/span><span style=\"color: #B5CEA8\">31<\/span><span style=\"color: #D4D4D4\">) \/ <\/span><span style=\"color: #B5CEA8\">32<\/span><span style=\"color: #D4D4D4\">) * <\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_pixel_size = old_row_size * old_height;<\/span><span style=\"color: #6A9955\"> \/\/ \u539f\u56fe\u6570\u636e\u603b\u5927\u5c0f<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ 1. \u3010\u65b0\u589e\u3011\u628a\u539f\u56fe\u5b8c\u6574\u8bfb\u5230\u5185\u5b58\u4e2d<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *old_pixels = (<\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *)<\/span><span style=\"color: #DCDCAA\">malloc<\/span><span style=\"color: #D4D4D4\">(old_pixel_size);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (!old_pixels) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">perror<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u539f\u56fe\u5185\u5b58\u5206\u914d\u5931\u8d25&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fseek<\/span><span style=\"color: #D4D4D4\">(in, <\/span><span style=\"color: #9CDCFE\">fh<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">bfOffBits<\/span><span style=\"color: #D4D4D4\">, SEEK_SET);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fread<\/span><span style=\"color: #D4D4D4\">(old_pixels, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, old_pixel_size, in);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u65b0\u56fe\u50cf\u5c3a\u5bf8\u8ba1\u7b97 (\u4f60\u7684\u4ee3\u7801)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> new_width = old_width \/ <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> new_height = old_height \/ <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> new_row_size = ((new_width * <\/span><span style=\"color: #B5CEA8\">24<\/span><span style=\"color: #D4D4D4\"> + <\/span><span style=\"color: #B5CEA8\">31<\/span><span style=\"color: #D4D4D4\">) \/ <\/span><span style=\"color: #B5CEA8\">32<\/span><span style=\"color: #D4D4D4\">) * <\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> new_pixel_size = new_row_size * new_height;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u5206\u914d\u65b0\u50cf\u7d20\u7f13\u51b2\u533a (\u4f60\u7684\u4ee3\u7801)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *new_pixels = (<\/span><span style=\"color: #569CD6\">unsigned<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">char<\/span><span style=\"color: #D4D4D4\"> *)<\/span><span style=\"color: #DCDCAA\">calloc<\/span><span style=\"color: #D4D4D4\">(new_pixel_size, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (!new_pixels) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">perror<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u5185\u5b58\u5206\u914d\u5931\u8d25&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ 2. \u3010\u6838\u5fc3\u4fee\u6539\u3011\u4e8c\u7ef4\u5750\u6807\u6620\u5c04 (\u6700\u8fd1\u90bb\u63d2\u503c\u6cd5\u7f29\u653e)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u904d\u5386\u65b0\u56fe\u7684\u6bcf\u4e00\u4e2a\u50cf\u7d20\u70b9<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> y = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">; y &lt; new_height; y++) <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> x = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">; x &lt; new_width; x++) <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u8ba1\u7b97\u5f53\u524d\u65b0\u50cf\u7d20\u5728 new_pixels \u6570\u7ec4\u91cc\u7684\u8d77\u59cb\u4f4d\u7f6e<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u516c\u5f0f\uff1a\u5f53\u524d\u884c\u6570 * \u65b0\u884c\u5bbd + \u5f53\u524d\u5217\u6570 * 3<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> new_index = y * new_row_size + x * <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u8ba1\u7b97\u8fd9\u4e2a\u70b9\u5bf9\u5e94\u5728\u539f\u56fe\u4e2d\u7684\u4f4d\u7f6e<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u56e0\u4e3a\u7f29\u5c0f\u4e862\u500d\uff0c\u6240\u4ee5\u53bb\u539f\u56fe\u91cc\u627e (x*2, y*2) \u8fd9\u4e2a\u5750\u6807\u7684\u50cf\u7d20<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_x = x * <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_y = y * <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> old_index = old_y * old_row_size + old_x * <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #6A9955\">\/\/ \u628a\u539f\u56fe\u7684 B, G, R \u590d\u5236\u5230\u65b0\u56fe<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #9CDCFE\">new_pixels<\/span><span style=\"color: #D4D4D4\">&#91;new_index&#93;     = <\/span><span style=\"color: #9CDCFE\">old_pixels<\/span><span style=\"color: #D4D4D4\">&#91;old_index&#93;;<\/span><span style=\"color: #6A9955\">     \/\/ B<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #9CDCFE\">new_pixels<\/span><span style=\"color: #D4D4D4\">&#91;new_index + <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">&#93; = <\/span><span style=\"color: #9CDCFE\">old_pixels<\/span><span style=\"color: #D4D4D4\">&#91;old_index + <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><span style=\"color: #6A9955\"> \/\/ G<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #9CDCFE\">new_pixels<\/span><span style=\"color: #D4D4D4\">&#91;new_index + <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93; = <\/span><span style=\"color: #9CDCFE\">old_pixels<\/span><span style=\"color: #D4D4D4\">&#91;old_index + <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93;;<\/span><span style=\"color: #6A9955\"> \/\/ R<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ ... \u540e\u9762\u6784\u5efa new_fh, new_ih \u5e76\u5199\u5165\u6587\u4ef6\u7684\u4ee3\u7801\u4e0d\u53d8 ...<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u8bb0\u5f97\u6700\u540e\u91ca\u653e\u65b0\u5206\u914d\u7684 old_pixels<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">free<\/span><span style=\"color: #D4D4D4\">(old_pixels);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u6784\u5efa\u65b0\u6587\u4ef6\u5934\u548c\u4fe1\u606f\u5934<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    BITMAPFILEHEADER new_fh;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    BITMAPINFOHEADER new_ih;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_fh<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">bfType<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">0x4D42<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_fh<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">bfSize<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_fh) + <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_ih) + new_pixel_size;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_fh<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">bfReserved1<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_fh<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">bfReserved2<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_fh<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">bfOffBits<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_fh) + <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_ih);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biSize<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_ih);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biWidth<\/span><span style=\"color: #D4D4D4\"> = new_width;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biHeight<\/span><span style=\"color: #D4D4D4\"> = new_height;<\/span><span style=\"color: #6A9955\"> \/\/ \u4fdd\u6301\u4e0e\u539f\u56fe\u76f8\u540c\u7684\u7b26\u53f7\uff08\u6b63\u6570\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biPlanes<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biBitCount<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">24<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biCompression<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biSizeImage<\/span><span style=\"color: #D4D4D4\"> = new_pixel_size;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biXPelsPerMeter<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biXPelsPerMeter<\/span><span style=\"color: #D4D4D4\">;<\/span><span style=\"color: #6A9955\"> \/\/ \u4fdd\u6301\u539f\u5206\u8fa8\u7387\u6216\u586b\u9ed8\u8ba4\u503c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biYPelsPerMeter<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #9CDCFE\">ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biYPelsPerMeter<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biClrUsed<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #9CDCFE\">new_ih<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biClrImportant<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    FILE *out = <\/span><span style=\"color: #DCDCAA\">fopen<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93;, <\/span><span style=\"color: #CE9178\">&quot;wb&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (!out)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">perror<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u521b\u5efa\u8f93\u51fa\u6587\u4ef6\u5931\u8d25&quot;<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">free<\/span><span style=\"color: #D4D4D4\">(new_pixels);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> -<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fwrite<\/span><span style=\"color: #D4D4D4\">(&amp;new_fh, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_fh), out);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fwrite<\/span><span style=\"color: #D4D4D4\">(&amp;new_ih, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #569CD6\">sizeof<\/span><span style=\"color: #D4D4D4\">(new_ih), out);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fwrite<\/span><span style=\"color: #D4D4D4\">(new_pixels, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, new_pixel_size, out);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(out);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">free<\/span><span style=\"color: #D4D4D4\">(new_pixels);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\u7f29\u5c0f\u4e00\u534a\u7684\u56fe\u50cf\u5df2\u751f\u6210: <\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #D7BA7D\">\\n<\/span><span style=\"color: #CE9178\">&quot;<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":202,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-embedded"],"_links":{"self":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/200","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/comments?post=200"}],"version-history":[{"count":1,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/200\/revisions"}],"predecessor-version":[{"id":203,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/200\/revisions\/203"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media\/202"}],"wp:attachment":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media?parent=200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/categories?post=200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/tags?post=200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}