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love / src / modules / image / CompressedData.h

 * Copyright (c) 2006-2014 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.


#include "common/Data.h"
#include "common/StringMap.h"
#include "common/int.h"

// STL
#include <vector>

namespace love
namespace image

 * CompressedData represents image data which is designed to be uploaded to the
 * GPU and rendered in its compressed form, without being un-compressed.
 * http://renderingpipeline.com/2012/07/texture-compression/
class CompressedData : public Data

	// Recognized compressed image data formats.
	enum Format

	// Compressed image data can have multiple mipmap levels, each represented
	// by a sub-image.
	struct SubImage
		int width, height;
		size_t size;
		uint8 *data; // Should not have ownership of the data.

	virtual ~CompressedData();

	// Implements Data.
	virtual void *getData() const;
	virtual size_t getSize() const;

	 * Gets the number of mipmaps in this Compressed Image Data.
	 * Includes the base image level.
	int getMipmapCount() const;

	 * Gets the size in bytes of a sub-image at the specified mipmap level.
	size_t getSize(int miplevel) const;

	 * Gets the byte data of a sub-image at the specified mipmap level.
	void *getData(int miplevel) const;

	 * Gets the width of a sub-image at the specified mipmap level.
	int getWidth(int miplevel) const;

	 * Gets the height of a sub-image at the specified mipmap level.
	int getHeight(int miplevel) const;

	 * Gets the format of the compressed data.
	Format getFormat() const;

	static bool getConstant(const char *in, Format &out);
	static bool getConstant(Format in, const char *&out);


	Format format;

	// Single block of memory containing all of the sub-images.
	uint8 *data;
	size_t dataSize;

	// Texture info for each mipmap level.
	std::vector<SubImage> dataImages;

	void checkMipmapLevelExists(int miplevel) const;


	static StringMap<Format, FORMAT_MAX_ENUM>::Entry formatEntries[];
	static StringMap<Format, FORMAT_MAX_ENUM> formats;

}; // CompressedData

} // image
} // love