adding important low-level code for image and matrix manipulations

src/core/include/pw/core/image.hpp

@@ -33,22 +33,36 @@ public:
 
     image() = default;
 
-	enum image_type {
+    enum pixel_layout {
         RGB8,
         RGBA8,
         LUM
     };
 
-	bool create(const sizei& size,);
+    image(const sizei& s, pixel_layout t, void *ptr = nullptr);
+
+    bool create(const sizei& s, pixel_layout t, void *ptr = nullptr);
+
+    void destroy(bool release_memory = false);
 
 	const uint8_t *data() const { return _data.data(); }
 	uint8_t *data() { return _data.data(); }
 
+    pixel_layout layout() const;
+    void set_layout(const pixel_layout &layout);
+
+    uint64_t change_count() const;
+    void set_change_count(const uint64_t &change_count);
+
+    static uint32_t bytes_per_pixel(pixel_layout t);
+
 protected:
 
     sizei _size;
+    pixel_layout _layout;
+    uint64_t _change_count;
+
     std::vector<uint8_t> _data;
-    std::string _uri;
 
 };
 

src/core/include/pw/core/matrix.hpp

@@ -487,8 +487,6 @@ public:
 
 };
 
-//////////////////////////////////////////////////////////////////////////
-
 //
 // Specializations
 //

src/core/include/pw/core/size.hpp

@@ -36,6 +36,8 @@ struct size_ {
 
 	size_(T_ w,T_ h) : width(w), height(h) {}
 
+    T_ area() const { return std::abs(width * height); }
+
 };
 
 typedef size_<real_t> size;

src/core/src/image.cpp

@@ -0,0 +1,71 @@
+#include "pw/core/image.hpp"
+
+#include <limits>
+
+namespace pw {
+
+image::image(const sizei &s, image::pixel_layout t, void *ptr)
+{
+
+}
+
+bool image::create(const sizei &s, image::pixel_layout t, void *ptr)
+{
+    auto n = bytes_per_pixel(t) * s.area();
+
+    if (ptr != nullptr) {
+
+        auto a = reinterpret_cast<uint8_t*>(ptr);
+
+        _data.assign(a,a + n);
+
+    } else {
+
+        _data.resize(n,0);
+    }
+
+    return !_data.empty();
+}
+
+void image::destroy(bool release_memory)
+{
+    _data.clear();
+
+    if (release_memory) _data.shrink_to_fit();
+}
+
+uint32_t image::bytes_per_pixel(image::pixel_layout t)
+{
+    switch (t) {
+    case pw::image::RGB8:
+        return 3;
+    case pw::image::RGBA8:
+        return 4;
+    case pw::image::LUM:
+        return 1;
+    }
+
+    return std::numeric_limits<uint32_t>::max();
+}
+
+image::pixel_layout image::layout() const
+{
+    return _layout;
+}
+
+void image::set_layout(const pixel_layout &layout)
+{
+    _layout = layout;
+}
+
+uint64_t image::change_count() const
+{
+    return _change_count;
+}
+
+void image::set_change_count(const uint64_t &change_count)
+{
+    _change_count = change_count;
+}
+
+}