mrmBot-Matrix/natives/freeze.cc

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2023-03-15 14:09:09 +00:00
#include <algorithm>
#include <map>
#include <vips/vips8>
#include "common.h"
using namespace std;
using namespace vips;
char *Freeze(string type, string *outType, char *BufferData,
size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
bool loop = GetArgumentWithFallback<bool>(Arguments, "loop", false);
int frame = GetArgumentWithFallback<int>(Arguments, "frame", -1);
char *fileData = (char *)malloc(BufferLength);
memcpy(fileData, BufferData, BufferLength);
char *match = (char *)"\x21\xFF\x0BNETSCAPE2.0\x03\x01";
char *descriptor = (char *)"\x2C\x00\x00\x00\x00";
char *lastPos;
bool none = true;
if (loop) {
char *newData = (char *)malloc(BufferLength + 19);
memcpy(newData, fileData, BufferLength);
lastPos = (char *)memchr(newData, '\x2C', BufferLength);
while (lastPos != NULL) {
if (memcmp(lastPos, descriptor, 5) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x2C',
(BufferLength - (lastPos - newData)) - 1);
continue;
}
memcpy(lastPos + 19, lastPos, (BufferLength - (lastPos - newData)));
memcpy(lastPos, match, 16);
memcpy(lastPos + 16, "\x00\x00\x00", 3);
none = false;
*DataSize = BufferLength + 19;
break;
}
if (none) *DataSize = BufferLength;
return newData;
} else if (frame >= 0 && !loop) {
VOption *options = VImage::option()->set("access", "sequential");
VImage in =
VImage::new_from_buffer(BufferData, BufferLength, "",
type == "gif" ? options->set("n", -1) : options)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha()) in = in.bandjoin(255);
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = vips_image_get_n_pages(in.get_image());
int framePos = clamp(frame, 0, (int)nPages);
VImage out = in.crop(0, 0, in.width(), pageHeight * (framePos + 1));
out.set(VIPS_META_PAGE_HEIGHT, pageHeight);
out.set("loop", 1);
void *buf;
out.write_to_buffer(("." + *outType).c_str(), &buf, DataSize);
return (char *)buf;
} else {
lastPos = (char *)memchr(fileData, '\x21', BufferLength);
while (lastPos != NULL) {
if (memcmp(lastPos, match, 16) != 0) {
lastPos = (char *)memchr(lastPos + 1, '\x21',
(BufferLength - (lastPos - fileData)) - 1);
continue;
}
memcpy(lastPos, lastPos + 19, (BufferLength - (lastPos - fileData)) - 19);
*DataSize = BufferLength - 19;
none = false;
break;
}
if (none) *DataSize = BufferLength;
return fileData;
}
}