Move decoder-agnostic love.image code out of the magpie backend folder.

--HG--
branch : minor

src/modules/image/CompressedSlice.h

@@ -0,0 +1,72 @@
+/**
+ * Copyright (c) 2006-2017 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#pragma once
+
+// LOVE
+#include "common/int.h"
+#include "common/pixelformat.h"
+#include "common/Object.h"
+#include "ImageDataBase.h"
+
+namespace love
+{
+namespace image
+{
+
+class CompressedMemory : public Object
+{
+public:
+
+	CompressedMemory(size_t size);
+	virtual ~CompressedMemory();
+
+	uint8 *data;
+	size_t size;
+
+}; // CompressedMemory
+
+// Compressed image data can have multiple mipmap levels, each represented by a
+// sub-image.
+class CompressedSlice : public ImageDataBase
+{
+public:
+
+	CompressedSlice(PixelFormat format, int width, int height, CompressedMemory *memory, size_t offset, size_t size);
+	CompressedSlice(const CompressedSlice &slice);
+	virtual ~CompressedSlice();
+
+	CompressedSlice *clone() const override;
+	void *getData() const override { return memory->data + offset; }
+	size_t getSize() const override { return dataSize; }
+	bool isSRGB() const override { return sRGB; }
+	size_t getOffset() const { return offset; }
+
+private:
+
+	StrongRef<CompressedMemory> memory;
+	size_t offset;
+	size_t dataSize;
+	bool sRGB;
+
+}; // CompressedSlice
+
+} // image
+} // love