Convert lz77 to use fixed buffer sizes.

test/CMakeLists.txt

@@ -19,6 +19,7 @@ list(APPEND TestFiles
             compiler/TestTemplatingEngine.cpp
             compression/TestStreamCompressor.cpp
             compression/TestHuffmanStream.cpp
+            compression/TestLz77Encoder.cpp
             database/TestDatabase.cpp
             fonts/TestFontReader.cpp
             graphics/TestRasterizer.cpp

test/compression/TestLz77Encoder.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+
+#include "Lz77Encoder.h"
+#include "BufferBitStream.h"
+
+int main()
+{
+    std::vector<unsigned> values {0, 10, 11, 12, 10, 11, 12, 0, 13, 14, 15, 10, 11, 12};
+
+    //std::vector<unsigned> values {0, 1, 2, 3, 0, 1, 2, 3, 0,1};
+
+    BufferBitStream input_stream;
+    for (auto value : values)
+    {
+        input_stream.writeByte(value);
+    }
+
+    BufferBitStream output_stream;
+
+    Lz77Encoder encoder(&input_stream, &output_stream);
+
+    encoder.encode();
+
+    auto hit_buffer = encoder.getHitBuffer();
+    for(const auto& hit : hit_buffer)
+    {
+        const auto& [length, distance, next_char] = hit;
+        std::cout << "Got hit " << length << " | " << distance << " | " << static_cast<int>(next_char) << std::endl;
+    }
+
+    return 0;
+}

test/image/TestPngWriter.cpp

@@ -28,6 +28,7 @@ void testCompressedPng()
 
     PngWriter writer;
     writer.setPath("test_compressed.png");
+    writer.setCompressionMethod(Deflate::CompressionMethod::NONE);
     writer.write(image);
 
     return;
@@ -72,9 +73,40 @@ void testFixedPng()
 
 }
 
+void testDynamicCompressedPng()
+{
+    unsigned width = 10;
+    unsigned height = 10;
+    unsigned numChannels = 1;
+    auto image = Image<unsigned char>::Create(width, height);
+    image->setNumChannels(numChannels);
+    image->setBitDepth(8);
+
+    std::vector<unsigned char> data(width*height, 0);
+    for (unsigned idx=0; idx<width*height; idx++)
+    {
+        //unsigned char val = 100 * idx /(width*height);
+        unsigned char val = 10;
+        data[idx] = val;
+    }
+
+    image->setData(data);
+
+    PngWriter writer;
+    writer.setPath("test_dynamic.png");
+    writer.write(image);
+
+    //return;
+    File test_file("test_dynamic.png");
+    std::cout << test_file.dumpBinary();
+
+}
+
 int main()
 {
     //testCompressedPng();
-    testFixedPng();
+    //testFixedPng();
+    testDynamicCompressedPng();
+
     return 0;
 }