mrmBot-Matrix/natives/jpeg.cc

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#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
ArgumentMap Jpeg(string type, string *outType, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
int quality = GetArgumentWithFallback<int>(Arguments, "quality", 0);
void *buf;
ArgumentMap output;
if (type == "gif") {
VImage in = VImage::new_from_buffer(
BufferData, BufferLength, "",
VImage::option()->set("access", "sequential")->set("n", -1))
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int totalHeight = in.height();
int nPages = vips_image_get_n_pages(in.get_image());
VImage final;
if (totalHeight > 65500) {
vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame = in.crop(0, i * pageHeight, width, pageHeight);
void *jpgBuf;
size_t jpgLength;
img_frame.write_to_buffer(
".jpg", &jpgBuf, &jpgLength,
VImage::option()->set("Q", quality)->set("strip", true));
VImage jpeged = VImage::new_from_buffer(jpgBuf, jpgLength, "");
jpeged.set(VIPS_META_PAGE_HEIGHT, pageHeight);
jpeged.set("delay", in.get_array_int("delay"));
img.push_back(jpeged);
}
final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
} else {
void *jpgBuf;
size_t jpgLength;
in.write_to_buffer(
".jpg", &jpgBuf, &jpgLength,
VImage::option()->set("Q", quality)->set("strip", true));
final = VImage::new_from_buffer(jpgBuf, jpgLength, "");
final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
final.set("delay", in.get_array_int("delay"));
}
final.write_to_buffer(
("." + *outType).c_str(), &buf, DataSize,
*outType == "gif" ? VImage::option()->set("dither", 0) : 0);
output["buf"] = (char *)buf;
output["width"] = width;
output["height"] = pageHeight;
} else {
VImage in = VImage::new_from_buffer(BufferData, BufferLength, "");
void *jpgBuf;
in.write_to_buffer(".jpg", &jpgBuf, DataSize,
VImage::option()->set("Q", quality)->set("strip", true));
if (*outType == "gif") {
VImage gifIn = VImage::new_from_buffer((char *)jpgBuf, *DataSize, "");
gifIn.write_to_buffer(
".gif", &buf, DataSize,
VImage::option()->set("Q", quality)->set("strip", true));
} else {
*outType = "jpg";
buf = jpgBuf;
}
output["buf"] = (char *)buf;
output["width"] = in.width();
output["height"] = vips_image_get_page_height(in.get_image());
}
return output;
}