mrmBot-Matrix/natives/snapchat.cc

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#include <vips/vips8>
#include "common.h"
using namespace std;
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using namespace vips;
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char *Snapchat(string type, string *outType, char *BufferData,
size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
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string caption = GetArgument<string>(Arguments, "caption");
float pos = GetArgumentWithFallback<float>(Arguments, "pos", 0.5);
string basePath = GetArgument<string>(Arguments, "basePath");
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
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type == "gif" ? options->set("n", -1) : options)
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.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
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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 size = width / 20;
int textWidth = width - ((width / 25) * 2);
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string font_string = "Helvetica Neue, Twemoji Color Font " + to_string(size);
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VImage textIn = VImage::text(
".", VImage::option()->set(
"fontfile", (basePath + "assets/fonts/caption2.ttf").c_str()));
textIn = VImage::text(
("<span foreground=\"white\" background=\"#000000B2\">" + caption +
"</span>")
.c_str(),
VImage::option()
->set("rgba", true)
->set("align", VIPS_ALIGN_CENTRE)
->set("font", font_string.c_str())
->set("fontfile", (basePath + "assets/fonts/twemoji.otf").c_str())
->set("width", textWidth));
int bgHeight = textIn.height() + (width / 25);
textIn = ((textIn == (vector<double>){0, 0, 0, 0}).bandand())
.ifthenelse({0, 0, 0, 178}, textIn)
.embed((width / 2) - (textIn.width() / 2),
(bgHeight / 2) - (textIn.height() / 2), width, bgHeight,
VImage::option()
->set("extend", "background")
->set("background", (vector<double>){0, 0, 0, 178}));
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vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
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type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
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img_frame = img_frame.composite2(
textIn, VIPS_BLEND_MODE_OVER,
VImage::option()->set("x", 0)->set("y", pageHeight * pos));
img.push_back(img_frame);
}
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VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
void *buf;
final.write_to_buffer(
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("." + *outType).c_str(), &buf, DataSize,
*outType == "gif"
? VImage::option()->set("dither", 0)->set("reoptimise", 1)
: 0);
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return (char *)buf;
}