47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
#include <map>
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#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 *Flip(string *type, char *BufferData, size_t BufferLength,
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ArgumentMap Arguments, size_t *DataSize) {
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bool flop = GetArgument<bool>(Arguments, "flop");
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VImage in = VImage::new_from_buffer(BufferData, BufferLength, "",
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*type == "gif"
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? VImage::option()->set("n", -1)->set(
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"access", "sequential")
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: 0)
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.colourspace(VIPS_INTERPRETATION_sRGB);
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if (!in.has_alpha()) in = in.bandjoin(255);
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VImage out;
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if (flop) {
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out = in.flip(VIPS_DIRECTION_HORIZONTAL);
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} else if (*type == "gif") {
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// libvips gif handling is both a blessing and a curse
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vector<VImage> img;
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int pageHeight = vips_image_get_page_height(in.get_image());
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int nPages = vips_image_get_n_pages(in.get_image());
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for (int i = 0; i < nPages; i++) {
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VImage img_frame = in.crop(0, i * pageHeight, in.width(), pageHeight);
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VImage flipped = img_frame.flip(VIPS_DIRECTION_VERTICAL);
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img.push_back(flipped);
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}
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out = VImage::arrayjoin(img, VImage::option()->set("across", 1));
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out.set(VIPS_META_PAGE_HEIGHT, pageHeight);
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} else {
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out = in.flip(VIPS_DIRECTION_VERTICAL);
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}
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void *buf;
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out.write_to_buffer(
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("." + *type).c_str(), &buf, DataSize,
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*type == "gif" ? VImage::option()->set("dither", 0)->set("reoptimise", 1)
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: 0);
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return (char *)buf;
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} |