# Changes

- Fix PD Image
- Add some beta RLE Compress Decompress variants

include/pd/core/io.hpp

@@ -30,6 +30,12 @@ namespace PD {
  * Set of File Functions
  */
 namespace IO {
+enum RleFmt {
+  Default = 0,
+  _16 = 1 << 0,
+  _32 = 1 << 1,
+  _64 = 1 << 2,
+};
 /**
  * Load a File into an 8Bit Memory Buffer
  * @param path Path to the File
@@ -42,5 +48,25 @@ PD_CORE_API std::vector<u8> LoadFile2Mem(const std::string& path);
  * @return 32Bit Hash
  */
 PD_CORE_API u32 HashMemory(const std::vector<u8>& data);
+/**
+ * Function to decrompress RLE buffer
+ * @param data Data buffer to decompress
+ */
+PD_CORE_API void DecompressRLE(std::vector<u8>& data);
+/**
+ * Function to decrompress Extended RLE Buffer
+ * @param data Data buffer to decompress
+ */
+PD_CORE_API void DecompressRLE_Ex(std::vector<u8>& data);
+/**
+ * Function to compress data with RLE Algorithm
+ * @param data Data buf
+ */
+PD_CORE_API void CompressRLE(std::vector<u8>& data);
+/**
+ * Extended RLE Compress function (slower cause searches best format)
+ * @param data Data buf
+ */
+PD_CORE_API void CompressRLE_Ex(std::vector<u8>& data);
 }  // namespace IO
 }  // namespace PD

source/core/io.cpp

@@ -23,6 +23,74 @@ SOFTWARE.
 
 #include <pd/core/io.hpp>
 
+PD_CORE_API void DecompressRLE16(std::vector<PD::u8>& data) {
+  std::vector<PD::u8> cpy = data;
+  data.clear();
+  for (size_t i = 0; i < cpy.size(); i += 3) {
+    for (size_t j = 0; j < cpy[i + 2]; j++) {
+      data.push_back(cpy[i]);
+      data.push_back(cpy[i + 1]);
+    }
+  }
+}
+
+PD_CORE_API void DecompressRLE32(std::vector<PD::u8>& data) {
+  std::vector<PD::u8> cpy = data;
+  data.clear();
+  for (size_t i = 0; (i + 4) < cpy.size(); i += 5) {
+    for (size_t j = 0; j < cpy[i + 4]; j++) {
+      data.push_back(cpy[i]);
+      data.push_back(cpy[i + 1]);
+      data.push_back(cpy[i + 2]);
+      data.push_back(cpy[i + 3]);
+    }
+  }
+}
+
+PD_CORE_API void CompressRLE16(std::vector<PD::u8>& data) {
+  std::vector<PD::u8> cpy = data;
+  data.clear();
+  size_t i = 0;
+  while ((i + 1) < cpy.size()) {
+    PD::u16 v = PD::u16(cpy[i]) | (PD::u16(cpy[i + 1]) << 8);
+    size_t c = 1;
+    while ((i + c * 2 + 1) < cpy.size() &&
+           (PD::u16(cpy[i + c * 2]) | (PD::u16(cpy[i + c * 2 + 1])) << 8) ==
+               v &&
+           c < 255) {
+      c++;  // c++ ...
+    }
+    data.push_back(PD::u8(v & 0xFF));
+    data.push_back(PD::u8((v >> 8) & 0xFF));
+    data.push_back(c);
+    i += c * 2;
+  }
+}
+
+PD_CORE_API void CompressRLE32(std::vector<PD::u8>& data) {
+  std::vector<PD::u8> cpy = data;
+  data.clear();
+  size_t i = 0;
+  while ((i + 3) < cpy.size()) {
+    PD::u32 v = PD::u32(cpy[i]) | (PD::u32(cpy[i + 1]) << 8) |
+                (PD::u32(cpy[i + 2]) << 16) | (PD::u32(cpy[i + 3]) << 24);
+    size_t c = 1;
+    while ((i + c * 4 + 3) < cpy.size() &&
+           (PD::u32(cpy[i + c * 4]) | (PD::u32(cpy[i + c * 4 + 1]) << 8) |
+            (PD::u32(cpy[i + c * 4 + 2]) << 16) |
+            (PD::u32(cpy[i + c * 4 + 3]) << 24)) == v &&
+           c < 255) {
+      c++;  // c++ ...
+    }
+    data.push_back(PD::u8(v & 0xFF));
+    data.push_back(PD::u8((v >> 8) & 0xFF));
+    data.push_back(PD::u8((v >> 16) & 0xFF));
+    data.push_back(PD::u8((v >> 24) & 0xFF));
+    data.push_back(c);
+    i += c * 4;
+  }
+}
+
 namespace PD {
 namespace IO {
 PD_CORE_API std::vector<u8> LoadFile2Mem(const std::string& path) {
@@ -38,6 +106,7 @@ PD_CORE_API std::vector<u8> LoadFile2Mem(const std::string& path) {
   iff.close();
   return res;
 }
+
 PD_CORE_API u32 HashMemory(const std::vector<u8>& data) {
   u32 hash = 4477;
   for (auto& it : data) {
@@ -45,5 +114,78 @@ PD_CORE_API u32 HashMemory(const std::vector<u8>& data) {
   }
   return hash;
 }
+
+PD_CORE_API void DecompressRLE(std::vector<u8>& data) {
+  if ((data.size() % 2) != 0) {
+    return;
+  }
+  std::vector<u8> cpy = data;
+  data.clear();
+  for (size_t i = 0; i < cpy.size(); i += 2) {
+    data.insert(data.end(), cpy[i + 1], cpy[i]);
+  }
+}
+
+PD_CORE_API void DecompressRLE_Ex(std::vector<u8>& data) {
+  if (!data.size()) {
+    return;
+  }
+  u8 fmt = data[0];
+  data.erase(data.begin());
+  if (fmt == 0) {
+    DecompressRLE(data);
+  } else if (fmt == 1) {
+    DecompressRLE16(data);
+  } else if (fmt == 2) {
+    DecompressRLE32(data);
+  }
+  /** unknown returns input data */
+}
+
+PD_CORE_API void CompressRLE(std::vector<u8>& data) {
+  if (data.empty()) {
+    /** No exceptions enabled :( */
+    return;
+  }
+  std::vector<u8> cpy = data;
+  data.clear();
+  /** 8-Bit RLE */
+  data.push_back(0);
+  size_t i = 0;
+  while (i < cpy.size()) {
+    u8 v = cpy[i];
+    u8 c = 1;
+    while (i + c < cpy.size() && cpy[i + c] == v && c < 255) {
+      c++;  // c++ ...
+    }
+    data.push_back(v);
+    data.push_back(c);
+    i += c;
+  }
+}
+
+PD_CORE_API void CompressRLE_Ex(std::vector<u8>& data) {
+  if (data.empty()) {
+    /** No exceptions enabled :( */
+    return;
+  }
+  std::vector<u8> _8 = data;
+  std::vector<u8> _16 = data;
+  std::vector<u8> _32 = data;
+  CompressRLE(_8);
+  CompressRLE16(_16);
+  CompressRLE32(_32);
+  if (_16.size() < _8.size() && _16.size() < _32.size()) {
+    _16.insert(_16.begin(), 1);
+    data = _16;
+    return;
+  } else if (_32.size() < _8.size()) {
+    _32.insert(_32.begin(), 2);
+    data = _32;
+    return;
+  }
+  _8.insert(_8.begin(), 0);
+  data = _8;
+}
 }  // namespace IO
 }  // namespace PD

source/image/image.cpp

@@ -78,22 +78,25 @@ PD_IMAGE_API void Image::Copy(const std::vector<u8>& buf, int w, int h,
 }
 
 PD_IMAGE_API void Image::Convert(Image::Ref img, Image::Format dst) {
-  if (img->Fmt() == dst) {
+  if (img->pFmt == dst) {
     return;
-  } else if (img->Fmt() == Image::RGB && dst == Image::BGR) {
+  } else if (img->pFmt == Image::RGB && dst == Image::BGR) {
     ImgConvert::ReverseBuf(img->pBuffer, 3, img->pWidth, img->pHeight);
-  } else if (img->Fmt() == Image::RGB && dst == Image::RGBA) {
+    img->pFmt = BGR;
+  } else if (img->pFmt == Image::RGB && dst == Image::RGBA) {
     std::vector<PD::u8> cpy = img->pBuffer;
     img->pBuffer.resize(img->pWidth * img->pHeight * 4);
     ImgConvert::RGB24toRGBA32(img->pBuffer, cpy, img->pWidth, img->pHeight);
-  } else if (img->Fmt() == Image::RGBA && dst == Image::RGB) {
+    img->pFmt = RGBA;
+  } else if (img->pFmt == Image::RGBA && dst == Image::RGB) {
     std::vector<PD::u8> cpy = img->pBuffer;
     img->pBuffer.resize(img->pWidth * img->pHeight * 3);
     ImgConvert::RGB32toRGBA24(img->pBuffer, cpy, img->pWidth, img->pHeight);
-  } else if (img->Fmt() == Image::RGBA && dst == Image::RGB565) {
+    img->pFmt = RGB;
+  } else if (img->pFmt == Image::RGBA && dst == Image::RGB565) {
     Convert(img, Image::RGB);
     Convert(img, Image::RGB565);
-  } else if (img->Fmt() == Image::RGB && dst == Image::RGB565) {
+  } else if (img->pFmt == Image::RGB && dst == Image::RGB565) {
     auto f = [](u8 r, u8 g, u8 b) -> u16 {
       u16 _r = (r >> 3);
       u16 _g = (g >> 2);
@@ -111,6 +114,7 @@ PD_IMAGE_API void Image::Convert(Image::Ref img, Image::Format dst) {
         img->pBuffer[dst + 1] = new_px & 0xff;
       }
     }
+    img->pFmt = RGB565;
   }
 }