mrmBot-Matrix/natives/whisper.cc

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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 *Whisper(string type, string *outType, char *BufferData,
size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
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string caption = GetArgument<string>(Arguments, "caption");
string basePath = GetArgument<string>(Arguments, "basePath");
VOption *options = VImage::option()->set("access", "sequential");
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 / 6;
int dividedWidth = width / 175;
int rad = 1;
string font_string = "Upright, Twemoji Color Font " + to_string(size);
VImage mask;
if (dividedWidth >= 1) {
mask = VImage::black(dividedWidth * 2 + 1, dividedWidth * 2 + 1) + 128;
mask.draw_circle({255}, dividedWidth, dividedWidth, dividedWidth,
VImage::option()->set("fill", true));
} else {
mask = VImage::black(rad * 2 + 1, rad * 2 + 1) + 128;
mask.draw_circle({255}, rad, rad, rad, VImage::option()->set("fill", true));
}
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VImage textIn = VImage::text(
".", VImage::option()->set(
"fontfile", (basePath + "assets/fonts/whisper.otf").c_str()));
textIn = VImage::text(
("<span foreground=\"white\">" + 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", width));
textIn = textIn.embed(rad + 10, rad + 10, (textIn.width() + 2 * rad) + 20,
(textIn.height() + 2 * rad) + 20);
VImage outline = textIn.morph(mask, VIPS_OPERATION_MORPHOLOGY_DILATE)
.gaussblur(0.5, VImage::option()->set("min_ampl", 0.1));
outline = (outline == (vector<double>){0, 0, 0, 0});
VImage invert = outline.extract_band(3).invert();
outline =
outline.extract_band(0, VImage::option()->set("n", outline.bands() - 1))
.bandjoin(invert);
VImage textImg = outline.composite2(textIn, VIPS_BLEND_MODE_OVER);
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(
textImg, VIPS_BLEND_MODE_OVER,
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VImage::option()
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->set("x", (width / 2) - (textImg.width() / 2))
->set("y", (pageHeight / 2) - (textImg.height() / 2)));
img.push_back(img_frame);
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}
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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;
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}