Sorry but looking at it again I noticed that the rgb colors aren't swaped,
you only have a unnecessary loop and memory allocation.
This is my actual implementation that produce wrong colors.
int Fl_JPEG_Image::encode(Fl_Image *img, int quality,
unsigned char **outbuffer, int &outlen){
#ifdef HAVE_LIBJPEG
int imgw = img->w(), imgh = img->h(), imgd = img->d();
outlen = imgw * imgh * imgd;
struct jpeg_compress_struct cinfo = {0};
struct jpeg_error_mgr jerr;
if (imgd == 3) cinfo.in_color_space = JCS_RGB;
else if (imgd == 1) cinfo.in_color_space = JCS_GRAYSCALE;
else return -1;
*outbuffer = NULL;
unsigned long sz_outlen = 0;
/* create our in-memory output buffer to hold the jpeg */
*outbuffer = (unsigned char *) malloc(outlen+8*1024); //safe margin
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_mem_dest(&cinfo, outbuffer, &sz_outlen);
cinfo.image_width = imgw;
cinfo.image_height = imgh;
cinfo.input_components = imgd;
jpeg_set_defaults(&cinfo);
jpeg_set_quality (&cinfo, quality, true);
jpeg_start_compress(&cinfo, true);
uchar * row_pointer;
uchar *idata = (uchar *)img->data()[0];
/* main code to write jpeg data */
int iwd = imgw * imgd;
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer = idata + cinfo.next_scanline * iwd;
(void) jpeg_write_scanlines(&cinfo, &row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
outlen = sz_outlen;
// FILE* outfile = fopen("test.jpeg", "wb");
// if (outfile){
// fwrite(*outbuffer, outlen,1 ,outfile);
// fclose(outfile);
// }
return 0;
#else
return -1;
#endif // HAVE_LIBJPEG
}
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