linux - How to resize an image from an rgb buffer using c++ -

-

i have (char*)rgb buffer has data of actual image. let's actual image resolution 720x576. want resize resolution , 120x90. how can using https://code.google.com/p/jpeg-compressor/ or libjpeg ?

note: can use other library, should work in linux.

edited: video decoder decodes frame in yuv, convert rgb. these happen in buffer. need resize rgb buffer make thumbnail out of variable size.

thanks in advance

i did following achieve goal:

#define tn_width 240 #define tn_height 180  #include "jpegcompressor/jpge.h" #include "jpegcompressor/jpgd.h" #include <ippi.h>  bool createthumnailjpeg(const uint8* psrc, int srcwidth, int srcheight) { int req_comps = 3; jpge::params params; params.m_quality = 50; params.m_subsampling =  jpge::h2v2; params.m_two_pass_flag = false;   file *fpjpegtn = fopen("resource\\jpegcompressor.jpeg","wb");  int dstwidth = tn_width; int dstheight = tn_height; int uidstbuffersize = dstwidth * dstheight * 3; uint8 *pdstrgbbuffer = new uint8[uidstbuffersize]; uint8 *pjpegtnbuffer = new uint8[uidstbuffersize];  int uisrcbuffersize = srcwidth * srcheight * 3;  ippisize srcsize = {srcwidth , srcheight}; ippirect srcroi = {0, 0, srcwidth, srcheight}; ippisize dstroisize = {dstwidth, dstheight}; double xfactor = (double) dstwidth / srcwidth; double yfactor = (double) dstheight / srcheight; ippstatus status = ippiresize_8u_c3r(psrc, srcsize, srcwidth*3, srcroi,     pdstrgbbuffer,  dstwidth*3, dstroisize, xfactor, yfactor, 1);  if (!jpge::compress_image_to_jpeg_file_in_memory(pjpegtnbuffer, uidstbuffersize, dstwidth, dstheight, req_comps, pdstrgbbuffer, params)) {     cout << "failed!";     delete[] pdstrgbbuffer;     delete [] pjpegtnbuffer;     return false; } if (fpjpegtn) {     fwrite(pjpegtnbuffer, uidstbuffersize, 1, fpjpegtn);     fclose(fpjpegtn); }    delete [] pdstrgbbuffer; delete [] pjpegtnbuffer;  return true; }

Comments

Post a Comment

Popular posts from this blog

java - Oracle EBS .ClassNotFoundException: oracle.apps.fnd.formsClient.FormsLauncher.class ERROR -

-
i need in configuring java on machine because, when try loading forms, loader goes in circles , gives error: java.lang.classnotfoundexception: oracle.apps.fnd.formsclient.formslauncher.class @ sun.plugin2.applet.applet2classloader.findclass(unknown source) @ sun.plugin2.applet.plugin2classloader.loadclass0(unknown source) @ sun.plugin2.applet.plugin2classloader.loadclass(unknown source) @ sun.plugin2.applet.plugin2classloader.loadclass(unknown source) @ java.lang.classloader.loadclass(unknown source) @ sun.plugin2.applet.plugin2classloader.loadcode(unknown source) @ sun.plugin2.applet.plugin2manager.createapplet(unknown source) @ sun.plugin2.applet.plugin2manager$appletexecutionrunnable.run (unknown source) @ java.lang.thread.run(unknown source) i have tried re-installing firefox, older versions of java runtime environments, disabling proxy. what missing? application working on other machines. i spent around 100 hours finding s...
Read more

c# - how to use buttonedit in devexpress gridcontrol -

-
Image
i trying create gridcontrol buttonedit in 1 of columns. when user clicks button edit, popups form select product. when selection done on popup, returns datarow selection main grid below. but when column loses focus, value wrote column disappear. here code creates gridcontrol's data , buttonedit's click event. private void frmsiparisnew_load(object sender, eventargs e) { dt = new datatable(); dt.columns.add("malzeme_kodu",typeof(string)); dt.columns.add("malzeme_aciklama", typeof(string)); dt.columns.add("adet", typeof(decimal)); dt.columns.add("birim", typeof(string)); dt.columns.add("fiyat", typeof(decimal)); dt.columns.add("kur", typeof(string)); dt.columns.add("tutar", typeof(decimal)); datarow dr = dt.newrow(); dt.rows.add(dr); gc.datasource = dt; } private void repositoryitembuttoneditmal...
Read more

How do you convert a timestamp into a datetime in python with the correct timezone? -

-
you naively expect work: import pytz datetime import datetime def tz_datetime_from_timestamp(timestamp): """convert timestamp datetime """ tz = pytz.timezone('australia/perth') server_time = datetime.utcnow() delta = tz.utcoffset(server_time) value = datetime.utcfromtimestamp(timestamp).replace(tzinfo=tz) return value + delta print tz_datetime_from_timestamp(1416387060) and convert timestamp 1416387060 wed nov 19 16:51:00 2014 gmt+8:00. ...but not. prints: 2014-11-19 16:51:00+07:43 the timezone of australia/perth not gmt+7:43. it gmt+8:00. unequivocally stated on australian government website http://www.australia.gov.au/about-australia/our-country/time : awst equal coordinated universal time plus 8 hours (utc +8). so, heck pytz pulling 7.43 from? well, turns out pytz pulls data http://www.iana.org/time-zones time zone database, , database states: # western australia # # rule name type in on @...
Read more