{"id":189,"date":"2026-04-03T22:44:23","date_gmt":"2026-04-03T14:44:23","guid":{"rendered":"http:\/\/www.millscience.cn\/?p=189"},"modified":"2026-04-03T22:44:26","modified_gmt":"2026-04-03T14:44:26","slug":"showbmp","status":"publish","type":"post","link":"https:\/\/www.millscience.cn\/index.php\/showbmp\/","title":{"rendered":"\u663e\u793a\u4efb\u610f\u5927\u5c0f\u7684bmp\u56fe\u7247\u5728lcd\u5c4f\u5e55\u4e0a"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\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>\/**\n * @filename:    showbmp.c\n * @brief:       showbmp\n * @author:      philia\n * @date:        2026\/3\/15\n * @version:     ver1.0\n * @note         none\n * CopyRight (c) 2026   philia  All Right Reseverd\n *\/\n\n#include &lt;stdio.h>\n#include &lt;sys\/types.h>\n#include &lt;sys\/stat.h>\n#include &lt;fcntl.h>\n#include &lt;stdint.h>\n#include &lt;unistd.h>\n#include &lt;sys\/mman.h>\n#include &lt;string.h>\n#include &lt;stdlib.h>\n\n\/\/ ...(\u4fdd\u6301\u4f60\u7684\u7ed3\u6784\u4f53\u5b9a\u4e49\u4e0d\u53d8)...\n#pragma pack(push, 1) \/\/ \u7981\u7528\u5185\u5b58\u5bf9\u9f50\n\ntypedef struct\n\n{\n    uint16_t bfType;      \/\/ \u6587\u4ef6\u6807\u8bc6\uff0c\u5fc5\u987b\u4e3a \"BM\"\uff080x4D42\uff09\n    uint32_t bfSize;      \/\/ \u6587\u4ef6\u603b\u5927\u5c0f\uff08\u5b57\u8282\uff09\n    uint16_t bfReserved1; \/\/ \u4fdd\u7559\u5b57\u6bb5\uff08\u5fc5\u987b\u4e3a0\uff09\n    uint16_t bfReserved2; \/\/ \u4fdd\u7559\u5b57\u6bb5\uff08\u5fc5\u987b\u4e3a0\uff09\n    uint32_t bfOffBits;   \/\/ \u50cf\u7d20\u6570\u636e\u504f\u79fb\u91cf\uff08\u4ece\u6587\u4ef6\u5934\u5230\u50cf\u7d20\u6570\u636e\u7684\u5b57\u8282\u6570\uff09\n} BITMAPFILEHEADER;\n\n#pragma pack(pop)\n\ntypedef struct\n\n{\n\n    uint32_t biSize;         \/\/ \u672c\u7ed3\u6784\u4f53\u5927\u5c0f\uff08\u901a\u5e38\u4e3a40\uff09\n    int32_t biWidth;         \/\/ \u56fe\u50cf\u5bbd\u5ea6\uff08\u50cf\u7d20\uff09\n    int32_t biHeight;        \/\/ \u56fe\u50cf\u9ad8\u5ea6\uff08\u50cf\u7d20\uff09\uff0c\u6b63\u6570\u8868\u793a\u4ece\u4e0b\u5230\u4e0a\u5b58\u50a8\n    uint16_t biPlanes;       \/\/ \u989c\u8272\u5e73\u9762\u6570\uff08\u5fc5\u987b\u4e3a1\uff09\n    uint16_t biBitCount;     \/\/ \u6bcf\u50cf\u7d20\u4f4d\u6570\uff081\/4\/8\/16\/24\/32\uff09\n    uint32_t biCompression;  \/\/ \u538b\u7f29\u65b9\u5f0f\uff080\u8868\u793a\u4e0d\u538b\u7f29\uff09\n    uint32_t biSizeImage;    \/\/ \u50cf\u7d20\u6570\u636e\u5927\u5c0f\uff08\u5b57\u8282\uff09\uff0c\u538b\u7f29\u65f6\u9700\u586b\u5199\n    int32_t biXPelsPerMeter; \/\/ \u6c34\u5e73\u5206\u8fa8\u7387\uff08\u50cf\u7d20\/\u7c73\uff09\n    int32_t biYPelsPerMeter; \/\/ \u5782\u76f4\u5206\u8fa8\u7387\uff08\u50cf\u7d20\/\u7c73\uff09\n    uint32_t biClrUsed;      \/\/ \u5b9e\u9645\u4f7f\u7528\u7684\u8c03\u8272\u677f\u989c\u8272\u6570\uff080\u8868\u793a\u5168\u90e8\uff09\n    uint32_t biClrImportant; \/\/ \u91cd\u8981\u989c\u8272\u6570\uff080\u8868\u793a\u6240\u6709\u989c\u8272\u5747\u91cd\u8981\uff09\n\n} BITMAPINFOHEADER;\n\nint main(int argc, const char *argv[])\n{\n    \/\/ \u3010\u4fee\u590d1\u3011\uff1a\u5fc5\u987b\u6821\u9a8c\u4f20\u5165\u7684\u53c2\u6570\u4e2a\u6570\uff01\n    if (argc != 4) {\n        printf(\"\u7528\u6cd5\u9519\u8bef\uff01\u6b63\u786e\u683c\u5f0f: %s &lt;bmp\u6587\u4ef6> &lt;\u8d77\u59cbX> &lt;\u8d77\u59cbY>\\n\", argv&#91;0&#93;);\n        return -1;\n    }\n\n    \/\/ \u6253\u5f00bmp\u6587\u4ef6\n    FILE *bmp = fopen(argv&#91;1&#93;, \"rb\");\n    if (bmp == NULL) {\n        printf(\"bmp\u6587\u4ef6\u6253\u5f00\u5931\u8d25\\n\");\n        return -1;\n    }\n\n    \/\/ \u8bfb\u53d6bmp\u6587\u4ef6\u4fe1\u606f\n    BITMAPFILEHEADER fileheader;\n    BITMAPINFOHEADER infoheader;\n    fread(&amp;fileheader, 14, 1, bmp);\n    fread(&amp;infoheader, 40, 1, bmp);\n\n    int bmp_width = infoheader.biWidth;\n    int bmp_height = infoheader.biHeight;\n\n    \/\/ \u5904\u7406\u9ad8\u5ea6\u4e3a\u8d1f\u6570\u7684\u60c5\u51b5\uff08\u6709\u4e9bBMP\u662f\u4ece\u4e0a\u5012\u4e0b\u5b58\u7684\uff09\n    if (bmp_height &lt; 0) bmp_height = -bmp_height; \n\n    \/\/ \u83b7\u53d6\u8f93\u5165\u7684\u8d77\u59cb\u5750\u6807\n    int x_start = atoi(argv&#91;2&#93;);\n    int y_start = atoi(argv&#91;3&#93;);\n\n    \/\/ \u3010\u4fee\u590d3\u3011\uff1a\u8ba1\u7b97\u5e26\u8865\u9f50\u7684\u884c\u5b57\u8282\u6570\uff0c\u5e76\u7528\u6b64\u5927\u5c0f\u5206\u914d\u5185\u5b58\n    int valid_bytes_per_row = bmp_width * 3;\n    int total_bytes_per_row = ((valid_bytes_per_row + 3) \/ 4) * 4;\n    int padding_bytes = total_bytes_per_row - valid_bytes_per_row;\n\n    \/\/ \u56fe\u7247\u6570\u636e\u7684\u603b\u5927\u5c0f\uff08\u5305\u542b\u5e9f\u5b57\u8282\uff09\n    int img_data_size = total_bytes_per_row * bmp_height;\n\n    \/\/ \u4f7f\u7528 malloc \u5728\u5806\u533a\u5206\u914d\u5927\u5185\u5b58\uff0c\u9632\u6b62\u6808\u6ea2\u51fa\u6bb5\u9519\u8bef\n    unsigned char *bmp_buf = (unsigned char *)malloc(img_data_size);\n    if (bmp_buf == NULL) {\n        printf(\"\u5185\u5b58\u5206\u914d\u5931\u8d25\\n\");\n        fclose(bmp);\n        return -1;\n    }\n\n    \/\/ \u5c06\u6587\u4ef6\u6307\u9488\u79fb\u52a8\u5230\u771f\u6b63\u7684\u50cf\u7d20\u6570\u636e\u5f00\u59cb\u5904\uff08\u8df3\u8fc7\u4e2d\u95f4\u53ef\u80fd\u7684\u8c03\u8272\u677f\u7b49\u6742\u6ce8\uff09\n    fseek(bmp, fileheader.bfOffBits, SEEK_SET);\n    \/\/ \u4e00\u6b21\u6027\u8bfb\u53d6\u5305\u542b\u5e9f\u5b57\u8282\u5728\u5185\u7684\u6240\u6709\u6570\u636e\n    fread(bmp_buf, img_data_size, 1, bmp);\n\n    \/\/ \u6253\u5f00lcd\u5c4f\u5e55\n    int fd = open(\"\/dev\/ubuntu_lcd\", O_RDWR);\n    if (fd == -1) {\n        printf(\"lcd\u5c4f\u5e55\u6253\u5f00\u5931\u8d25\uff01\\n\");\n        free(bmp_buf);\n        fclose(bmp);\n        return -1;\n    }\n\n    \/\/ \u7533\u8bf7\u5185\u5b58\u7a7a\u95f4\u5185\u5b58\u6620\u5c04\n    int *lcd_buf = (int *)mmap(NULL, 800 * 480 * 4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);\n    if (lcd_buf == MAP_FAILED) {\n        perror(\"mmap\");\n        free(bmp_buf);\n        fclose(bmp);\n        close(fd);\n        return -1;\n    }\n    \/\/ 0xFF \u4e5f\u5c31\u662f\u6309\u5b57\u8282\u5168\u90e8\u586b\u6ee1 1\uff0c\u62fc\u6210 32 \u4f4d\u5c31\u662f 0xFFFFFFFF (\u7eaf\u767d)\n    memset(lcd_buf, 0xFFFF0000, 800 * 480 * 4);\n\n    \/\/ \u3010\u4fee\u590d2\u3011\uff1a\u53ea\u4fdd\u7559\u4e00\u4e2a\u7edf\u4e00\u7684\u5199\u5165\u5faa\u73af\n    int i = 0; \n    int data = 0;\n\n    \/\/ \u5f00\u59cb\u6620\u5c04\uff1aY\u8f74\u5012\u5e8f\uff0c\u4ece\u56fe\u7247\u7684\u6700\u540e\u4e00\u884c\u753b\u5230\u7b2c\u4e00\u884c\n    for (int y = y_start + bmp_height - 1; y >= y_start; y--)\n    {\n        for (int x = x_start; x &lt; x_start + bmp_width; x++)\n        {\n            \/\/ \u4fdd\u62a4\u4f1e\uff1a\u53ea\u6709\u5728\u5c4f\u5e55\u5750\u6807\u8303\u56f4\u5185\u7684\u50cf\u7d20\u624d\u5141\u8bb8\u5199\u5165\u663e\u5b58\n            if (x >= 0 &amp;&amp; x &lt; 800 &amp;&amp; y >= 0 &amp;&amp; y &lt; 480)\n            {\n                data |= bmp_buf&#91;i&#93;;           \/\/ B\n                data |= bmp_buf&#91;i + 1&#93; &lt;&lt; 8;  \/\/ G\n                data |= bmp_buf&#91;i + 2&#93; &lt;&lt; 16; \/\/ R\n                lcd_buf&#91;800 * y + x&#93; = data;\n            }\n\n            i += 3;   \/\/ \u5904\u7406\u5b8c\u4e00\u4e2a\u50cf\u7d20\n            data = 0; \n        }\n\n        \/\/ \u4e00\u884c\u6709\u6548\u6570\u636e\u8bfb\u5b8c\u4e86\uff0c\u8df3\u8fc7\u6587\u4ef6\u91cc\u7684\u5e9f\u5b57\u8282\u5bf9\u9f50\n        i += padding_bytes;\n    }\n\n    \/\/ \u6536\u5c3e\u5de5\u4f5c\uff1a\u91ca\u653e\u6240\u6709\u8d44\u6e90\n    free(bmp_buf);\n    fclose(bmp);\n    close(fd);\n    munmap(lcd_buf, 800 * 480 * 4);\n\n    printf(\"\u56fe\u7247\u663e\u793a\u6210\u529f\uff01\\n\");\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: #6A9955\">\/**<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@filename:<\/span><span style=\"color: #6A9955\">    showbmp.c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@brief<\/span><span style=\"color: #6A9955\">:       showbmp<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@author<\/span><span style=\"color: #6A9955\">:      philia<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@date<\/span><span style=\"color: #6A9955\">:        2026\/3\/15<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@version<\/span><span style=\"color: #6A9955\">:     ver1.0<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * <\/span><span style=\"color: #569CD6\">@note<\/span><span style=\"color: #6A9955\">         none<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> * CopyRight (c) 2026   philia  All Right Reseverd<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\"> *\/<\/span><\/span>\n<span class=\"line\"><\/span>\n<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;sys\/types.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/stat.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;fcntl.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;unistd.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;sys\/mman.h&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">#include<\/span><span style=\"color: #569CD6\"> <\/span><span style=\"color: #CE9178\">&lt;string.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: #6A9955\">\/\/ ...(\u4fdd\u6301\u4f60\u7684\u7ed3\u6784\u4f53\u5b9a\u4e49\u4e0d\u53d8)...<\/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\">push<\/span><span style=\"color: #569CD6\">, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #569CD6\">) <\/span><span style=\"color: #6A9955\">\/\/ \u7981\u7528\u5185\u5b58\u5bf9\u9f50<\/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>\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 style=\"color: #6A9955\">      \/\/ \u6587\u4ef6\u6807\u8bc6\uff0c\u5fc5\u987b\u4e3a &quot;BM&quot;\uff080x4D42\uff09<\/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 style=\"color: #6A9955\">      \/\/ \u6587\u4ef6\u603b\u5927\u5c0f\uff08\u5b57\u8282\uff09<\/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 style=\"color: #6A9955\"> \/\/ \u4fdd\u7559\u5b57\u6bb5\uff08\u5fc5\u987b\u4e3a0\uff09<\/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 style=\"color: #6A9955\"> \/\/ \u4fdd\u7559\u5b57\u6bb5\uff08\u5fc5\u987b\u4e3a0\uff09<\/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 style=\"color: #6A9955\">   \/\/ \u50cf\u7d20\u6570\u636e\u504f\u79fb\u91cf\uff08\u4ece\u6587\u4ef6\u5934\u5230\u50cf\u7d20\u6570\u636e\u7684\u5b57\u8282\u6570\uff09<\/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: #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\">typedef<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">struct<\/span><\/span>\n<span class=\"line\"><\/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\">uint32_t<\/span><span style=\"color: #D4D4D4\"> biSize;<\/span><span style=\"color: #6A9955\">         \/\/ \u672c\u7ed3\u6784\u4f53\u5927\u5c0f\uff08\u901a\u5e38\u4e3a40\uff09<\/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 style=\"color: #6A9955\">         \/\/ \u56fe\u50cf\u5bbd\u5ea6\uff08\u50cf\u7d20\uff09<\/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 style=\"color: #6A9955\">        \/\/ \u56fe\u50cf\u9ad8\u5ea6\uff08\u50cf\u7d20\uff09\uff0c\u6b63\u6570\u8868\u793a\u4ece\u4e0b\u5230\u4e0a\u5b58\u50a8<\/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 style=\"color: #6A9955\">       \/\/ \u989c\u8272\u5e73\u9762\u6570\uff08\u5fc5\u987b\u4e3a1\uff09<\/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 style=\"color: #6A9955\">     \/\/ \u6bcf\u50cf\u7d20\u4f4d\u6570\uff081\/4\/8\/16\/24\/32\uff09<\/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 style=\"color: #6A9955\">  \/\/ \u538b\u7f29\u65b9\u5f0f\uff080\u8868\u793a\u4e0d\u538b\u7f29\uff09<\/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 style=\"color: #6A9955\">    \/\/ \u50cf\u7d20\u6570\u636e\u5927\u5c0f\uff08\u5b57\u8282\uff09\uff0c\u538b\u7f29\u65f6\u9700\u586b\u5199<\/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 style=\"color: #6A9955\"> \/\/ \u6c34\u5e73\u5206\u8fa8\u7387\uff08\u50cf\u7d20\/\u7c73\uff09<\/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 style=\"color: #6A9955\"> \/\/ \u5782\u76f4\u5206\u8fa8\u7387\uff08\u50cf\u7d20\/\u7c73\uff09<\/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 style=\"color: #6A9955\">      \/\/ \u5b9e\u9645\u4f7f\u7528\u7684\u8c03\u8272\u677f\u989c\u8272\u6570\uff080\u8868\u793a\u5168\u90e8\uff09<\/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 style=\"color: #6A9955\"> \/\/ \u91cd\u8981\u989c\u8272\u6570\uff080\u8868\u793a\u6240\u6709\u989c\u8272\u5747\u91cd\u8981\uff09<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">} BITMAPINFOHEADER;<\/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: #6A9955\">\/\/ \u3010\u4fee\u590d1\u3011\uff1a\u5fc5\u987b\u6821\u9a8c\u4f20\u5165\u7684\u53c2\u6570\u4e2a\u6570\uff01<\/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\">4<\/span><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\u9519\u8bef\uff01\u6b63\u786e\u683c\u5f0f: <\/span><span style=\"color: #9CDCFE\">%s<\/span><span style=\"color: #CE9178\"> &lt;bmp\u6587\u4ef6&gt; &lt;\u8d77\u59cbX&gt; &lt;\u8d77\u59cbY&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\">    <\/span><span style=\"color: #6A9955\">\/\/ \u6253\u5f00bmp\u6587\u4ef6<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    FILE *bmp = <\/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\"> (bmp == <\/span><span style=\"color: #569CD6\">NULL<\/span><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;bmp\u6587\u4ef6\u6253\u5f00\u5931\u8d25<\/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: #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\">\/\/ \u8bfb\u53d6bmp\u6587\u4ef6\u4fe1\u606f<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    BITMAPFILEHEADER fileheader;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    BITMAPINFOHEADER infoheader;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fread<\/span><span style=\"color: #D4D4D4\">(&amp;fileheader, <\/span><span style=\"color: #B5CEA8\">14<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, bmp);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fread<\/span><span style=\"color: #D4D4D4\">(&amp;infoheader, <\/span><span style=\"color: #B5CEA8\">40<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, bmp);<\/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\"> bmp_width = <\/span><span style=\"color: #9CDCFE\">infoheader<\/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\"> bmp_height = <\/span><span style=\"color: #9CDCFE\">infoheader<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">biHeight<\/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\">\/\/ \u5904\u7406\u9ad8\u5ea6\u4e3a\u8d1f\u6570\u7684\u60c5\u51b5\uff08\u6709\u4e9bBMP\u662f\u4ece\u4e0a\u5012\u4e0b\u5b58\u7684\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (bmp_height &lt; <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">) bmp_height = -bmp_height; <\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u83b7\u53d6\u8f93\u5165\u7684\u8d77\u59cb\u5750\u6807<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> x_start = <\/span><span style=\"color: #DCDCAA\">atoi<\/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: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> y_start = <\/span><span style=\"color: #DCDCAA\">atoi<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">argv<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">&#93;);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u3010\u4fee\u590d3\u3011\uff1a\u8ba1\u7b97\u5e26\u8865\u9f50\u7684\u884c\u5b57\u8282\u6570\uff0c\u5e76\u7528\u6b64\u5927\u5c0f\u5206\u914d\u5185\u5b58<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> valid_bytes_per_row = bmp_width * <\/span><span style=\"color: #B5CEA8\">3<\/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\"> total_bytes_per_row = ((valid_bytes_per_row + <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">) \/ <\/span><span style=\"color: #B5CEA8\">4<\/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\"> padding_bytes = total_bytes_per_row - valid_bytes_per_row;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u56fe\u7247\u6570\u636e\u7684\u603b\u5927\u5c0f\uff08\u5305\u542b\u5e9f\u5b57\u8282\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> img_data_size = total_bytes_per_row * bmp_height;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u4f7f\u7528 malloc \u5728\u5806\u533a\u5206\u914d\u5927\u5185\u5b58\uff0c\u9632\u6b62\u6808\u6ea2\u51fa\u6bb5\u9519\u8bef<\/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\"> *bmp_buf = (<\/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\">(img_data_size);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (bmp_buf == <\/span><span style=\"color: #569CD6\">NULL<\/span><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;\u5185\u5b58\u5206\u914d\u5931\u8d25<\/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\">(bmp);<\/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\">\/\/ \u5c06\u6587\u4ef6\u6307\u9488\u79fb\u52a8\u5230\u771f\u6b63\u7684\u50cf\u7d20\u6570\u636e\u5f00\u59cb\u5904\uff08\u8df3\u8fc7\u4e2d\u95f4\u53ef\u80fd\u7684\u8c03\u8272\u677f\u7b49\u6742\u6ce8\uff09<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fseek<\/span><span style=\"color: #D4D4D4\">(bmp, <\/span><span style=\"color: #9CDCFE\">fileheader<\/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: #6A9955\">\/\/ \u4e00\u6b21\u6027\u8bfb\u53d6\u5305\u542b\u5e9f\u5b57\u8282\u5728\u5185\u7684\u6240\u6709\u6570\u636e<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fread<\/span><span style=\"color: #D4D4D4\">(bmp_buf, img_data_size, <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, bmp);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #6A9955\">\/\/ \u6253\u5f00lcd\u5c4f\u5e55<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> fd = <\/span><span style=\"color: #DCDCAA\">open<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;\/dev\/ubuntu_lcd&quot;<\/span><span style=\"color: #D4D4D4\">, O_RDWR);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (fd == -<\/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: #DCDCAA\">printf<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;lcd\u5c4f\u5e55\u6253\u5f00\u5931\u8d25\uff01<\/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\">free<\/span><span style=\"color: #D4D4D4\">(bmp_buf);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(bmp);<\/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\">\/\/ \u7533\u8bf7\u5185\u5b58\u7a7a\u95f4\u5185\u5b58\u6620\u5c04<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> *lcd_buf = (<\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> *)<\/span><span style=\"color: #DCDCAA\">mmap<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">NULL<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">, PROT_READ | PROT_WRITE, MAP_SHARED, fd, <\/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: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (lcd_buf == MAP_FAILED) {<\/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;mmap&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\">(bmp_buf);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(bmp);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #DCDCAA\">close<\/span><span style=\"color: #D4D4D4\">(fd);<\/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: #6A9955\">\/\/ 0xFF \u4e5f\u5c31\u662f\u6309\u5b57\u8282\u5168\u90e8\u586b\u6ee1 1\uff0c\u62fc\u6210 32 \u4f4d\u5c31\u662f 0xFFFFFFFF (\u7eaf\u767d)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">memset<\/span><span style=\"color: #D4D4D4\">(lcd_buf, <\/span><span style=\"color: #B5CEA8\">0xFFFF0000<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #B5CEA8\">4<\/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\">\/\/ \u3010\u4fee\u590d2\u3011\uff1a\u53ea\u4fdd\u7559\u4e00\u4e2a\u7edf\u4e00\u7684\u5199\u5165\u5faa\u73af<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> i = <\/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: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> data = <\/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\">    <\/span><span style=\"color: #6A9955\">\/\/ \u5f00\u59cb\u6620\u5c04\uff1aY\u8f74\u5012\u5e8f\uff0c\u4ece\u56fe\u7247\u7684\u6700\u540e\u4e00\u884c\u753b\u5230\u7b2c\u4e00\u884c<\/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 = y_start + bmp_height - <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">; y &gt;= y_start; 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 = x_start; x &lt; x_start + bmp_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\">\/\/ \u4fdd\u62a4\u4f1e\uff1a\u53ea\u6709\u5728\u5c4f\u5e55\u5750\u6807\u8303\u56f4\u5185\u7684\u50cf\u7d20\u624d\u5141\u8bb8\u5199\u5165\u663e\u5b58<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (x &gt;= <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\"> &amp;&amp; x &lt; <\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> &amp;&amp; y &gt;= <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\"> &amp;&amp; y &lt; <\/span><span style=\"color: #B5CEA8\">480<\/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\">                data |= <\/span><span style=\"color: #9CDCFE\">bmp_buf<\/span><span style=\"color: #D4D4D4\">&#91;i&#93;;<\/span><span style=\"color: #6A9955\">           \/\/ B<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">                data |= <\/span><span style=\"color: #9CDCFE\">bmp_buf<\/span><span style=\"color: #D4D4D4\">&#91;i + <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">&#93; &lt;&lt; <\/span><span style=\"color: #B5CEA8\">8<\/span><span style=\"color: #D4D4D4\">;<\/span><span style=\"color: #6A9955\">  \/\/ G<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">                data |= <\/span><span style=\"color: #9CDCFE\">bmp_buf<\/span><span style=\"color: #D4D4D4\">&#91;i + <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">&#93; &lt;&lt; <\/span><span style=\"color: #B5CEA8\">16<\/span><span style=\"color: #D4D4D4\">;<\/span><span style=\"color: #6A9955\"> \/\/ R<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">                <\/span><span style=\"color: #9CDCFE\">lcd_buf<\/span><span style=\"color: #D4D4D4\">&#91;<\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> * y + x&#93; = data;<\/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\">            i += <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">;<\/span><span style=\"color: #6A9955\">   \/\/ \u5904\u7406\u5b8c\u4e00\u4e2a\u50cf\u7d20<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            data = <\/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>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #6A9955\">\/\/ \u4e00\u884c\u6709\u6548\u6570\u636e\u8bfb\u5b8c\u4e86\uff0c\u8df3\u8fc7\u6587\u4ef6\u91cc\u7684\u5e9f\u5b57\u8282\u5bf9\u9f50<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        i += padding_bytes;<\/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\">\/\/ \u6536\u5c3e\u5de5\u4f5c\uff1a\u91ca\u653e\u6240\u6709\u8d44\u6e90<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">free<\/span><span style=\"color: #D4D4D4\">(bmp_buf);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">fclose<\/span><span style=\"color: #D4D4D4\">(bmp);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">close<\/span><span style=\"color: #D4D4D4\">(fd);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #DCDCAA\">munmap<\/span><span style=\"color: #D4D4D4\">(lcd_buf, <\/span><span style=\"color: #B5CEA8\">800<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #B5CEA8\">480<\/span><span style=\"color: #D4D4D4\"> * <\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">);<\/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;\u56fe\u7247\u663e\u793a\u6210\u529f\uff01<\/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: #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":190,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-189","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\/189","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=189"}],"version-history":[{"count":1,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/189\/revisions"}],"predecessor-version":[{"id":191,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/posts\/189\/revisions\/191"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media\/190"}],"wp:attachment":[{"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/media?parent=189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/categories?post=189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.millscience.cn\/index.php\/wp-json\/wp\/v2\/tags?post=189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}