{"id":3860,"date":"2018-03-12T20:48:14","date_gmt":"2018-03-12T12:48:14","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3860"},"modified":"2018-10-14T21:21:58","modified_gmt":"2018-10-14T13:21:58","slug":"opengl_read_pcx_file_rle","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_read_pcx_file_rle\/","title":{"rendered":"OpenGL\u4e4b\u8b80\u53d6PCX\u6587\u6a94-RLE\u89e3\u78bc"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u8b80\u53d6PCX\u6587\u6a94-RLE\u89e3\u78bc<\/figcaption><\/figure>\n

\u300ePCX\u300f\u8207\u300eBMP\u300f\u540c\u6a23\u652f\u6301\u300eRLE\u7de8\u78bc\u300f,\u800c\u4e14\u652f\u63018Bit\u548c24Bit\u7684\u300eRLE\u7de8\u78bc\u300f\u6e32\u67d3\u6f14\u793a\u7a0b\u5f0f\u4e0b\u8f09<\/a>:<\/p>\n

\u5148\u8b1b\u89e38Bit (256\u8272)\u300eRLE\u7de8\u78bc\u300f\u7b97\u6cd5:<\/p>\n

    \n
  1. \u9996\u5b57\u7bc0\u628a\u300e\u91cd\u8907\u300f\u50cf\u7d20\u7684\u500b\u6578\u7684\u6700\u9ad8\u5169BIT\u8a2d\u70ba1\u4fdd\u5b58, 0xC0&length<\/li>\n
  2. \u89e3\u78bc\u6642\u53ea\u8981\u628a\u9996\u5b57\u7bc0\u6e1b192\u5373\u7b49\u65bc\u300e\u91cd\u8907\u300f\u500b\u6578,\u6216\u8005data& 0x3F\u63d0\u53d6\u6700\u4f4e\u516d\u4f4d.<\/li>\n
  3. \u6b21\u5b57\u7bc0\u5beb\u5165\u91cd\u8907\u7684\u50cf\u7d20\u503c<\/li>\n
  4. \u4e26\u4e14\u300e\u91cd\u8907\u300f\u50cf\u7d20\u7684\u6700\u5927\u9577\u5ea6\u70ba63,\u56e0\u70ba255(0xff)-192(0xc0)=63<\/li>\n
  5. \u5982\u679c\u50cf\u7d20\u5927\u65bc192,\u628a\u50cf\u6578\u7576\u6210\u300e\u4e0d\u91cd\u8907\u300f\u7684\u50cf\u7d20\u76f4\u63a5\u4fdd\u5b58<\/li>\n
  6. \u300e\u4e0d\u91cd\u8907\u300f\u7684\u50cf\u7d20\u76f4\u63a5\u4fdd\u5b58<\/li>\n<\/ol>\n

    PCX\u768424BIT\u5716\u6a94\u540c\u6a23\u4f7f\u7528\u300eRLE\u7de8\u78bc\u300f,\u4f46\u7db2\u7d61\u4e0aPCX\u768424Bit\u300eRLE\u89e3\u78bc\u300f\u7b97\u6cd5\u5927\u591a\u90fd\u662f\u4e0d\u6b63\u78ba,<\/p>\n

    24Bit\u300eRLE\u7de8\u78bc\u300f\u7b97\u6cd5:<\/p>\n

      \n
    1. 24BIT\u7b97\u6cd58Bit\u57fa\u672c\u4e00\u81f4.\u6700\u5927\u5206\u5225\u662f\u5b83\u5c0d\u6bcf\u884c\u50cf\u7d20\u7684RGB\u503c\u9032\u884c\u5206\u89e3\u5f8c\u518d\u9032\u884cRLE\u7de8\u78bc<\/li>\n
    2. \u6578\u64da:RGB RGB RGB<\/li>\n
    3. \u5206\u89e3:RRR GGG BBB<\/li>\n
    4. RLE:3R 3G 3B<\/li>\n<\/ol>\n

       <\/p>\n

      8Bit (256\u8272)\u300eRLE\u89e3\u78bc\u300fC\u4ee3\u78bc:<\/p>\n

      void Load_RLE_PCX(PBYTE image, PBYTE data, int width,int height)<\/p>\n

      {<\/p>\n

      BYTE value;<\/p>\n

      int length;\/\/ \u50cf\u7d20\u500b\u6578<\/p>\n

      int data_index = 0;\/\/ RLE\u7d22\u5f15<\/p>\n

      int image_index = 0;\/\/ \u5716\u50cf\u7d22\u5f15<\/p>\n

      int image_size = width * height;<\/p>\n

      while (image_index < image_size)\/\/ \u904d\u6b77\u58d3\u7e2e\u5f8c\u6578\u64da<\/p>\n

      {\/\/ \u5224\u65b7\u662f\u5426RLE\u7de8\u78bc<\/p>\n

      if (data[data_index] >= 192 && data[data_index] <= 255)<\/p>\n

      {\/\/ \u91cd\u8907\u7684\u6578\u64da<\/p>\n

      length = data[data_index] – 192;\/\/ \u9577\u5ea6<\/p>\n

      value\u00a0 = data[data_index + 1];\/\/ \u7d22\u5f15\u503c<\/p>\n

      while (length > 0)<\/p>\n

      {<\/p>\n

      image[image_index] = value;<\/p>\n

      ++image_index;<\/p>\n

      –length;<\/p>\n

      }<\/p>\n

      data_index = data_index + 2;<\/p>\n

      }<\/p>\n

      else<\/p>\n

      {\/\/ \u4e0d\u91cd\u7684\u6578\u64da<\/p>\n

      image[image_index] = data[data_index];<\/p>\n

      ++image_index;<\/p>\n

      ++data_index;<\/p>\n

      }<\/p>\n

      }<\/p>\n

      }<\/p>\n

       <\/p>\n

      24Bit\u300eRLE\u89e3\u78bc\u300fC\u4ee3\u78bc:<\/p>\n

      void Load_RLE24_PCX(PBYTE image, PBYTE data, int width, int height)<\/p>\n

      {<\/p>\n

      BYTE value;<\/p>\n

      int length = 0;\/\/ \u50cf\u7d20\u500b\u6578<\/p>\n

      int data_index = 0; \/\/ RLE\u7d22\u5f15<\/p>\n

      int image_index = 0; \/\/ \u5716\u50cf\u7d22\u5f15<\/p>\n

      int image_size = width * height;<\/p>\n

      for (image_index = 0; image_index < image_size; image_index = image_index + width)\/\/ \u904d\u6b77RLE\u7de8\u78bc\u6578\u64da<\/p>\n

      {<\/p>\n

      for (int i = 0, x = 0; i < 3 && x < width; )<\/p>\n

      {\/\/ \u5224\u65b7\u662f\u5426RLE\u7de8\u78bc<\/p>\n

      if (data[data_index] >= 192 && data[data_index] <= 255)<\/p>\n

      {\/\/ \u8b80\u53d6\u91cd\u8907\u7684\u6578\u64da<\/p>\n

      length = data[data_index] – 192;\/\/ \u6578\u64da\u7684\u9577\u5ea6<\/p>\n

      \/\/length = data[data_index] & 0x3F;<\/p>\n

      value = data[data_index + 1];\/\/ \u6578\u503c<\/p>\n

      data_index = data_index + 2; \/\/ RLE\u7de8\u78bc\u7d22\u5f15<\/p>\n

      while (length > 0)<\/p>\n

      {<\/p>\n

      if (x >= width)<\/p>\n

      {<\/p>\n

      ++i;<\/p>\n

      x = 0;\/\/ \u4ee5\u9054\u5230\u884c\u5c3e\u8df3\u8f49 i\u52a01 x\u8a2d0<\/p>\n

      }<\/p>\n

      image[(image_index + x) * 3 + i] = value;\/\/\u5beb\u5165\u91cd\u8907\u6578\u64da<\/p>\n

      ++x;\/\/ x\u5ea7\u6a19\u7d22\u5f15\u52a0\u4e00<\/p>\n

      –length;\/\/ \u91cd\u8907\u6578\u64da\u91cf\u6e1b\u4e00<\/p>\n

      }<\/p>\n

      }<\/p>\n

      else<\/p>\n

      {\/\/ \u7121\u58d3\u7e2e\u7684\u6578\u64da<\/p>\n

      image[(image_index + x) * 3 + i] = data[data_index];\/\/ \u5beb\u5165<\/p>\n

      ++data_index; \/\/ RLE\u7de8\u78bc\u7d22\u5f15<\/p>\n

      ++x;<\/p>\n

      }<\/p>\n

      if (x >= width)<\/p>\n

      {<\/p>\n

      ++i;<\/p>\n

      x = 0;<\/p>\n

      }<\/p>\n

      }<\/p>\n

      }<\/p>\n

      return;<\/p>\n

      }<\/p>\n

       <\/p>\n","protected":false},"excerpt":{"rendered":"

      \u300ePCX\u300f\u8207\u300eBMP\u300f\u540c\u6a23\u652f\u6301\u300eRLE\u7de8\u78bc\u300f,\u800c\u4e14\u652f\u63018Bit\u548c24Bit\u7684\u300eRLE\u7de8\u78bc\u300f\u6e32\u67d3\u6f14\u793a\u7a0b\u5f0f\u4e0b\u8f09: … <\/p>\n

      \u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u8b80\u53d6PCX\u6587\u6a94-RLE\u89e3\u78bc<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[50],"class_list":["post-3860","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3860","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/comments?post=3860"}],"version-history":[{"count":2,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3860\/revisions"}],"predecessor-version":[{"id":3863,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3860\/revisions\/3863"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}