Then I googled the Internet for a free and easy to use graphic library and I found libGD<\/a>. The good thing is that it can handle jpeg files. The bad thing is that it cannot do the texturing part. The next thing I had in mind was to use both libraries but this would mean to add lots of dependencies to my small application for a simple texture mapping function. So I decided to write my own texture mapping function to remember the good old days. I will not describe how texture mapping works as there are plenty of tutorials on the internet for this. int main (int argc, char *argv[]) in = fopen (argv[1], “rb”); \/* do the actual image processing \/*saving the new jpeg file *\/ For more information see the libGD Documentation<\/a>. Yesterday, for a small project of mine, I needed to implement a small utility to deform jpeg images from command line. The idea was to use texture mapping for deformations, so I needed a way to manipulate the jpeg images at the pixel level. The first thing I tried was the imagemagik utility. I’ve browsed…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7,11,2,10],"tags":[],"_links":{"self":[{"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/43"}],"collection":[{"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=43"}],"version-history":[{"count":0,"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/43\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=43"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=43"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zagura.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=43"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n
\nHere is how you can use the gd library to process jpeg images:
\n[c]
\n#include
\n{
\n gdImagePtr image;
\n FILE *in,*out;\/*open the existing jpeg file *\/<\/p>\n
\n image = gdImageCreateFromJpeg (in);
\n fclose (in);<\/p>\n
\n image->sx and image->sy gives the image resolution
\n image->tpixels[y][x] to access the truecolor pixels directly (int RGB)
\n *\/<\/p>\n
\n out = fopen (argv[2], “wb”);
\n gdImageJpeg(image,out,95\/*compression level*\/);
\n fclose(out);
\n}
\n[\/c]<\/p>\n
\nHave fun!
\n
<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"