83 lines
2.8 KiB
C++
83 lines
2.8 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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ArgumentMap Caption(string type, string *outType, char *BufferData,
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size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
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string caption = GetArgument<string>(Arguments, "caption");
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string font = GetArgument<string>(Arguments, "font");
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string basePath = GetArgument<string>(Arguments, "basePath");
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in =
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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);
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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 size = width / 10;
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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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int textWidth = width - ((width / 25) * 2);
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string font_string = (font == "roboto" ? "Roboto Condensed" : font) + " " +
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(font != "impact" ? "bold" : "normal") + " " +
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to_string(size);
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string captionText = "<span background=\"white\">" + caption + "</span>";
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VImage text;
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auto findResult = fontPaths.find(font);
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if (findResult != fontPaths.end()) {
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text = VImage::text(
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".", VImage::option()->set("fontfile",
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(basePath + findResult->second).c_str()));
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}
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text = VImage::text(
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captionText.c_str(),
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VImage::option()
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->set("rgba", true)
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->set("align", VIPS_ALIGN_CENTRE)
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->set("font", font_string.c_str())
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->set("fontfile", (basePath + "assets/fonts/twemoji.otf").c_str())
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->set("width", textWidth));
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VImage captionImage =
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((text == (vector<double>){0, 0, 0, 0}).bandand())
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.ifthenelse(255, text)
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.gravity(VIPS_COMPASS_DIRECTION_CENTRE, width, text.height() + size,
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VImage::option()->set("extend", "white"));
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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 =
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type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
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VImage frame = captionImage.join(
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img_frame, VIPS_DIRECTION_VERTICAL,
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VImage::option()->set("background", 0xffffff)->set("expand", true));
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img.push_back(frame);
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}
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VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
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final.set(VIPS_META_PAGE_HEIGHT, pageHeight + captionImage.height());
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void *buf;
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final.write_to_buffer(
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("." + *outType).c_str(), &buf, DataSize,
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*outType == "gif"
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? VImage::option()->set("dither", 0)->set("reoptimise", 1)
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: 0);
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ArgumentMap output;
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output["buf"] = (char *)buf;
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output["width"] = final.width();
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output["height"] = vips_image_get_page_height(final.get_image());
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return output;
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}
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