mrmBot-Matrix/natives/resize.cc

54 lines
No EOL
1.7 KiB
C++

#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
char *Resize(string *type, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
bool stretch = GetArgumentWithFallback<bool>(Arguments, "stretch", false);
bool wide = GetArgumentWithFallback<bool>(Arguments, "wide", false);
VOption *options = VImage::option()->set("access", "sequential");
VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
*type == "gif" ? options->set("n", -1) : options)
.colourspace(VIPS_INTERPRETATION_sRGB);
VImage out;
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
int finalHeight;
if (stretch) {
out =
in.resize(512.0 / (double)width,
VImage::option()->set("vscale", 512.0 / (double)pageHeight));
finalHeight = 512;
} else if (wide) {
out = in.resize(9.5, VImage::option()->set("vscale", 0.5));
finalHeight = pageHeight / 2;
} else {
// Pain. Pain. Pain. Pain. Pain.
vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
*type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
VImage resized = img_frame.resize(0.1).resize(
10, VImage::option()->set("kernel", VIPS_KERNEL_NEAREST));
img.push_back(resized);
finalHeight = resized.height();
}
out = VImage::arrayjoin(img, VImage::option()->set("across", 1));
}
out.set(VIPS_META_PAGE_HEIGHT, finalHeight);
void *buf;
out.write_to_buffer(("." + *type).c_str(), &buf, DataSize);
return (char *)buf;
}