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