本文整理汇总了C++中imageStruct::convertTo方法的典型用法代码示例。如果您正苦于以下问题：C++ imageStruct::convertTo方法的具体用法？C++ imageStruct::convertTo怎么用？C++ imageStruct::convertTo使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类imageStruct的用法示例。
在下文中一共展示了imageStruct::convertTo方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: save
bool imageJPEG::save(const imageStruct&constimage, const std::string&filename, const std::string&mimetype, const gem::Properties&props) {
struct jpeg_compress_struct cinfo;
/* More stuff */
FILE * outfile=NULL; /* target file */
JSAMPROW row_pointer; /* pointer to JSAMPLE row[s] */
int row_stride; /* physical row width in image buffer */
// We set up the normal JPEG error routines, then override error_exit
my_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
// Establish the setjmp return context for my_error_exit to use.
if ( setjmp(jerr.setjmp_buffer) ) {
// If we get here, the JPEG code has signaled an error.
// We need to clean up the JPEG object, close the input file, and return.
jpeg_destroy_compress(&cinfo);
if(outfile)
fclose(outfile);
return(false);
}
double fquality=100;
props.get("quality", fquality);
int quality=fquality;
if(GL_YUV422_GEM==constimage.format) {
error("don't know how to write YUV-images with libJPEG");
return false;
}
/* Now we can initialize the JPEG compression object. */
jpeg_create_compress(&cinfo);
if ((outfile = fopen(filename.c_str(), "wb")) == NULL) {
error("can't open %s\n", filename.c_str());
return (false);
}
jpeg_stdio_dest(&cinfo, outfile);
imageStruct image;
constimage.convertTo(&image, GL_RGB);
// image.fixUpDown();
JSAMPLE *image_buffer = image.data;
cinfo.image_width = image.xsize; /* image width and height, in pixels */
cinfo.image_height = image.ysize;
cinfo.input_components = 3; /* # of color components per pixel */
cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
jpeg_start_compress(&cinfo, TRUE);
row_stride = image.xsize * image.csize; /* JSAMPLEs per row in image_buffer */
while (cinfo.next_scanline < cinfo.image_height) {
/* jpeg_write_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could pass
* more than one scanline at a time if that's more convenient.
*/
int rowindex=cinfo.next_scanline;
if(!image.upsidedown)
rowindex=(cinfo.image_height-cinfo.next_scanline-1);
row_pointer = & image_buffer[rowindex * row_stride];
if(jpeg_write_scanlines(&cinfo, &row_pointer, 1) < 0){
error("GEM: could not write line %d to image %s", cinfo.next_scanline, filename.c_str());
jpeg_finish_compress(&cinfo);
fclose(outfile);
jpeg_destroy_compress(&cinfo);
return(false);
}
}
jpeg_finish_compress(&cinfo);
fclose(outfile);
jpeg_destroy_compress(&cinfo);
return true;
}