109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
#include <iostream>
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#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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void *memset16(void *m, uint16_t val, size_t count) {
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uint16_t *buf = (uint16_t *)m;
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while (count--) *buf++ = val;
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return m;
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}
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ArgumentMap vipsHandle(char *data, size_t length, size_t *DataSize, int speed, bool removeFrames) {
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VOption *options = VImage::option()->set("access", "sequential");
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VImage in = VImage::new_from_buffer(data, length, "", options->set("n", -1))
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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 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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VImage out;
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if (removeFrames) {
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vector<VImage> img;
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for (int i = 0; i < nPages; i += speed) {
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VImage img_frame = in.crop(0, i * pageHeight, width, pageHeight);
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img.push_back(img_frame);
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}
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out = VImage::arrayjoin(img, VImage::option()->set("across", 1));
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out.set(VIPS_META_PAGE_HEIGHT, pageHeight);
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} else {
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out = in;
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}
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void *buf;
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out.write_to_buffer(".gif", &buf, DataSize);
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ArgumentMap output;
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output["buf"] = (char *)buf;
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output["width"] = width;
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output["height"] = pageHeight;
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return output;
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}
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ArgumentMap Speed([[maybe_unused]] string type, string *outType, char *BufferData,
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size_t BufferLength, ArgumentMap Arguments, size_t *DataSize) {
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bool slow = GetArgumentWithFallback<bool>(Arguments, "slow", false);
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int speed = GetArgumentWithFallback<int>(Arguments, "speed", 2);
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char *fileData = (char *)malloc(BufferLength);
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memcpy(fileData, BufferData, BufferLength);
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char *match = (char *)"\x00\x21\xF9\x04";
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vector<uint16_t> old_delays;
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bool removeFrames = false;
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char *lastPos;
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// int amount = 0;
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lastPos = (char *)memchr(fileData, '\x00', BufferLength);
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while (lastPos != NULL) {
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if (memcmp(lastPos, match, 4) != 0) {
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lastPos = (char *)memchr(lastPos + 1, '\x00',
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(BufferLength - (lastPos - fileData)) - 1);
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continue;
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}
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//++amount;
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uint16_t old_delay;
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memcpy(&old_delay, lastPos + 5, 2);
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old_delays.push_back(old_delay);
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lastPos = (char *)memchr(lastPos + 1, '\x00',
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(BufferLength - (lastPos - fileData)) - 1);
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}
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int currentFrame = 0;
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lastPos = (char *)memchr(fileData, '\x00', BufferLength);
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while (lastPos != NULL) {
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if (memcmp(lastPos, match, 4) != 0) {
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lastPos = (char *)memchr(lastPos + 1, '\x00',
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(BufferLength - (lastPos - fileData)) - 1);
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continue;
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}
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uint16_t new_delay = slow ? old_delays[currentFrame] * speed
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: old_delays[currentFrame] / speed;
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if (!slow && new_delay <= 1) {
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removeFrames = true;
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break;
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}
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memset16(lastPos + 5, new_delay, 1);
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lastPos = (char *)memchr(lastPos + 1, '\x00',
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(BufferLength - (lastPos - fileData)) - 1);
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++currentFrame;
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}
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// TODO: this is cursed, fix it later
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ArgumentMap output = vipsHandle(BufferData, BufferLength, DataSize, speed, removeFrames);
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return output;
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} |