92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
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#include <amethyst/utils.hpp>
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#include <fstream>
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namespace amy {
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namespace utils {
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ui fastHash(cstr& s) {
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ui hash = 5381;
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for (auto& it : s) {
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hash = (hash * 33) + static_cast<uc>(it);
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}
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return hash;
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}
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vec<uc> loadFile2Mem(cstr& path) {
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std::ifstream iff(path, std::ios::binary);
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if (!iff) {
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return vec<uc>();
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}
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iff.seekg(0, std::ios::end);
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size_t szs = iff.tellg();
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iff.seekg(0, std::ios::beg);
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vec<uc> res(szs, 0);
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iff.read(reinterpret_cast<char*>(res.data()), res.size());
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iff.close();
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return res;
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}
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ui hashMemory(cvec<uc>& data) {
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ui hash = 4477;
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for (auto& it : data) {
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hash = (hash * 33) + it;
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}
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return hash;
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}
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ui nextPow2(ui v) {
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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v++;
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return (v >= 64 ? v : 64);
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}
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bool isSingleBitNum(ui v) { return v && !(v & (v - 1)); }
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namespace image {
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void reverseBuf(vec<uc>& buf, int w, int h, int c) {
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vec<uc> cpy = buf;
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int pos = (y * w + x) * c;
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for (size_t i = 0; i < c; i++) {
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buf[pos + c - 1 - i] = cpy[pos + i];
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}
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}
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}
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}
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void removeAlphaChannel(vec<uc>& buf, int w, int h) {
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vec<uc> cpy = buf;
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buf.resize(w * h * 3);
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++) {
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int src = (y * w + x) * 4;
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int dst = (y * w + x) * 3;
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buf[dst + 0] = cpy[src + 0];
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buf[dst + 1] = cpy[src + 1];
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buf[dst + 2] = cpy[src + 2];
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}
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}
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}
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void addAlphaChannel(vec<uc>& buf, int w, int h) {
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vec<uc> cpy = buf;
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buf.resize(w * h * 4);
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++) {
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int src = (y * w + x) * 3;
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int dst = (y * w + x) * 4;
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buf[dst + 0] = cpy[src + 0];
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buf[dst + 1] = cpy[src + 1];
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buf[dst + 2] = cpy[src + 2];
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buf[dst + 3] = 255;
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}
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}
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}
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} // namespace image
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} // namespace utils
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} // namespace amy
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