{"id":3794,"date":"2018-02-25T00:35:34","date_gmt":"2018-02-24T16:35:34","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3794"},"modified":"2018-10-14T21:25:56","modified_gmt":"2018-10-14T13:25:56","slug":"opengl_read_bitmap_file_rle","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_read_bitmap_file_rle\/","title":{"rendered":"OpenGL\u4e4b\u8b80\u53d6Bitmap\u5716\u6a94-RLE\u89e3\u78bc"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u8b80\u53d6Bitmap\u5716\u6a94-RLE\u89e3\u78bc<\/figcaption><\/figure>\n

\u300eBitmap\u300f\u82e5\u662f8Bit\u5716\u6a94\u5247\u652f\u6301RLE\u7de8\u78bc\uff08run length encoding\uff09,\u4f46\u7db2\u7d61\u4e0a\u5927\u591a\u89e3\u91cb\u5668\u90fd\u4e0d\u652f\u6301RLE\u89e3\u78bc,\u5be6\u73fe\u5b83\u975e\u5e38\u9593\u55ae,\u4f46\u82e5\u984f\u8272\u8f03\u591a\u5f88\u53ef\u80fd\u58d3\u7e2e\u5f8c\u7684\u5c3a\u5bf8\u6bd4\u4e0d\u58d3\u7e2e\u4e4b\u524d\u9084\u8981\u5927. Bitmap\u6587\u6a94<\/a>\u7684\u300ecompression\u300f\u7b49\u65bc1\u5247\u4f7f\u7528RLE8\u7de8\u78bc: \u6e32\u67d3\u6f14\u793a\u7a0b\u5f0f\u4e0b\u8f09<\/a>:<\/p>\n\n\n\n\n\n\n\n\n
\u6578\u503c<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
00 00<\/td>\n\u672c\u884c\u7d50\u5c3e,\u5ea7\u6a19\u79fb\u81f3\u4e0b\u4e00\u884c\u982d\u90e8<\/td>\n<\/tr>\n
00 01<\/td>\n\u4f4d\u5716\u7d50\u675f\u5b8c\u6210\u89e3\u78bc<\/td>\n<\/tr>\n
00 02 x y<\/td>\n\u7b2c\u4e09\u7b2c\u56db\u5b57\u7bc0\u5206\u5225\u7576\u524d\u4f4d\u7f6e\u7684X\u8207Y\u504f\u79fb\u91cf<\/td>\n<\/tr>\n
00 len val val val 00<\/td>\n\u975e\u58d3\u7e2e\u4e0d\u91cd\u8907\u6578\u64da,\u6b64\u6578\u503c\u9577\u5ea6\u8981\u4ee52\u5c0d\u9f4a,\u4e0d\u8db3\u4ee50\u88dc\u9f4a<\/p>\n

\u82e5\u6578\u503c\u70ba:00 03 BB CC DD 00<\/p>\n

\u5247\u89e3\u58d3\u5f8c:BB CC DD<\/td>\n<\/tr>\n

len val<\/td>\n\u58d3\u7e2e\u7684\u91cd\u8907\u6578\u64da<\/p>\n

\u82e5\u6578\u503c\u70ba:04 88<\/p>\n

\u5247\u89e3\u58d3\u5f8c:88 88 88 88<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

BMP-8Bit\u6a21\u5f0f\u7684RLE\u89e3\u78bc<\/p>\n

image:\u8f38\u51fa<\/p>\n

data:\u8f38\u5165RLE\u5716\u50cf\u6578\u64da<\/p>\n

data_size:RLE\u5716\u50cf\u6578\u64da\u9577\u5ea6<\/p>\n

void Load_RLE8_Bitmap(PBYTE image, PBYTE data, int data_size, int width)<\/p>\n

{<\/p>\n

BYTE value;<\/p>\n

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

int image_index = 0;<\/p>\n

int data_index = 0;<\/p>\n

int x = 0;<\/p>\n

int y = 0;<\/p>\n

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

{<\/p>\n

if (data[data_index] == 0 && data[data_index + 1] == 0)<\/p>\n

{\/\/ \u672c\u884c\u7d50\u5c3e<\/p>\n

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

x = 0;<\/p>\n

++y;<\/p>\n

}<\/p>\n

else<\/p>\n

if (data[data_index] == 0 && data[data_index + 1] == 1)<\/p>\n

{\/\/ \u4f4d\u5716\u7d50\u5c3e<\/p>\n

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

return ;<\/p>\n

}<\/p>\n

else<\/p>\n

if (data[data_index] == 0 && data[data_index + 1] == 2)<\/p>\n

{\/\/ \u7576\u524d\u4f4d\u7f6e\u7684\u504f\u79fb<\/p>\n

x = x + data[data_index + 2];<\/p>\n

y = y + data[data_index + 3];<\/p>\n

data_index = data_index + 4;<\/p>\n

}<\/p>\n

else<\/p>\n

if (data[data_index] == 0)<\/p>\n

{\/\/ \u975e\u58d3\u7e2e\u4e0d\u91cd\u8907\u6578\u64da<\/p>\n

length = data[data_index+1];<\/p>\n

image_index = y * width + x;<\/p>\n

memcpy(image + image_index, data+data_index+2, length);<\/p>\n

x = x + length;<\/p>\n

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

}<\/p>\n

else<\/p>\n

if(data[data_index] > 0)<\/p>\n

{\/\/ \u58d3\u7e2e\u7684\u91cd\u8907\u6578\u64da<\/p>\n

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

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

image_index = y * width + x;<\/p>\n

memset(image + image_index, value, length);<\/p>\n

x = x + length;<\/p>\n

data_index = data_index + 2;\/\/ \u91cd\u8907\u7684\u50cf\u7d20<\/p>\n

}<\/p>\n

}<\/p>\n

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

\u300eBitmap\u300f\u82e5\u662f8Bit\u5716\u6a94\u5247\u652f\u6301RLE\u7de8\u78bc\uff08run length encoding\uff09,\u4f46\u7db2\u7d61\u4e0a\u5927\u591a\u89e3\u91cb\u5668 … <\/p>\n

\u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u8b80\u53d6Bitmap\u5716\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-3794","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\/3794","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=3794"}],"version-history":[{"count":10,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3794\/revisions"}],"predecessor-version":[{"id":4665,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3794\/revisions\/4665"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}