mrmBot-Matrix/natives/caption.cc

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#include <map>
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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 *Caption(string type, string *outType, char *BufferData,
size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
string caption = GetArgument<string>(Arguments, "caption");
string font = GetArgument<string>(Arguments, "font");
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 size = width / 10;
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
int textWidth = width - ((width / 25) * 2);
string font_string = (font == "roboto" ? "Roboto Condensed" : font) + " " +
(font != "impact" ? "bold" : "normal") + " " +
to_string(size);
string captionText = "<span background=\"white\">" + caption + "</span>";
VImage text;
auto findResult = fontPaths.find(font);
if (findResult != fontPaths.end()) {
text = VImage::text(
".", VImage::option()->set("fontfile",
(basePath + findResult->second).c_str()));
}
text = VImage::text(
captionText.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));
VImage captionImage =
((text == (vector<double>){0, 0, 0, 0}).bandand())
.ifthenelse(255, text)
.gravity(VIPS_COMPASS_DIRECTION_CENTRE, width, text.height() + size,
VImage::option()->set("extend", "white"));
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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VImage frame = captionImage.join(
img_frame, VIPS_DIRECTION_VERTICAL,
VImage::option()->set("background", 0xffffff)->set("expand", true));
img.push_back(frame);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, pageHeight + captionImage.height());
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;
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}