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/* $Id$ */

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#ifndef BLITTER_BASE_HPP

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#define BLITTER_BASE_HPP

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#include "../spritecache.h"

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#include "../spriteloader/spriteloader.hpp"

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enum BlitterMode {

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	BM_NORMAL,

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	BM_COLOUR_REMAP,

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	BM_TRANSPARENT,

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};

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/**

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 * How all blitters should look like. Extend this class to make your own.

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 */

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class Blitter {

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public:

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	struct BlitterParams {

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		const void *sprite;      ///< Pointer to the sprite how ever the encoder stored it

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		const byte *remap;       ///< XXX -- Temporary storage for remap array

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		int skip_left, skip_top; ///< How much pixels of the source to skip on the left and top (based on zoom of dst)

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		int width, height;       ///< The width and height in pixels that needs to be drawn to dst

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		int sprite_width;        ///< Real width of the sprite

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		int sprite_height;       ///< Real height of the sprite

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		int left, top;           ///< The offset in the 'dst' in pixels to start drawing

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		void *dst;               ///< Destination buffer

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		int pitch;               ///< The pitch of the destination buffer

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	};

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	typedef void *AllocatorProc(size_t size);

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	/**

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	 * Get the screen depth this blitter works for.

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	 *  This is either: 8, 16, 24 or 32.

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	 */

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	virtual uint8 GetScreenDepth() = 0;

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	/**

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	 * Draw an image to the screen, given an amount of params defined above.

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	 */

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	virtual void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) = 0;

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	/**

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	 * Draw a colortable to the screen. This is: the color of the screen is read

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	 *  and is looked-up in the palette to match a new color, which then is put

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	 *  on the screen again.

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	 * @param dst the destination pointer (video-buffer).

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	 * @param width the width of the buffer.

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	 * @param height the height of the buffer.

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	 * @param pal the palette to use.

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	 */

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	virtual void DrawColorMappingRect(void *dst, int width, int height, int pal) = 0;

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	/**

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	 * Convert a sprite from the loader to our own format.

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	 */

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	virtual Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator) = 0;

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	/**

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	 * Move the destination pointer the requested amount x and y, keeping in mind

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	 *  any pitch and bpp of the renderer.

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	 * @param video The destination pointer (video-buffer) to scroll.

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	 * @param x How much you want to scroll to the right.

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	 * @param y How much you want to scroll to the bottom.

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	 * @return A new destination pointer moved the the requested place.

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	 */

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	virtual void *MoveTo(const void *video, int x, int y) = 0;

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	/**

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	 * Draw a pixel with a given color on the video-buffer.

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	 * @param video The destination pointer (video-buffer).

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	 * @param x The x position within video-buffer.

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	 * @param y The y position within video-buffer.

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	 * @param color A 8bpp mapping color.

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	 */

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	virtual void SetPixel(void *video, int x, int y, uint8 color) = 0;

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	/**

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	 * Draw a pixel with a given color on the video-buffer if there is currently a black pixel.

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	 * @param video The destination pointer (video-buffer).

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	 * @param x The x position within video-buffer.

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	 * @param y The y position within video-buffer.

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	 * @param color A 8bpp mapping color.

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	 */

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	virtual void SetPixelIfEmpty(void *video, int x, int y, uint8 color) = 0;

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	/**

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	 * Make a single horizontal line in a single color on the video-buffer.

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	 * @param video The destination pointer (video-buffer).

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	 * @param width The lenght of the line.

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	 * @param color A 8bpp mapping color.

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	 */

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	virtual void DrawRect(void *video, int width, int height, uint8 color) = 0;

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	/**

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	 * Copy from a buffer to the screen.

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	 * @param video The destionation pointer (video-buffer).

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	 * @param src The buffer from which the data will be read.

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	 * @param width The width of the buffer.

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	 * @param height The height of the buffer.

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	 * @param src_pitch The pitch (byte per line) of the source buffer.

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	 */

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	virtual void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) = 0;

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	/**

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	 * Copy from the screen to a buffer.

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	 * @param video The destination pointer (video-buffer).

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	 * @param dst The buffer in which the data will be stored.

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	 * @param width The width of the buffer.

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	 * @param height The height of the buffer.

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	 * @param dst_pitch The pitch (byte per line) of the destination buffer.

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	 */

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	virtual void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) = 0;

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	/**

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	 * Move the videobuffer some places (via memmove).

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	 * @param video_dst The destination pointer (video-buffer).

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	 * @param video_src The source pointer (video-buffer).

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	 * @param width The width of the buffer to move.

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	 * @param height The height of the buffer to move.

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	 */

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	virtual void MoveBuffer(void *video_dst, const void *video_src, int width, int height) = 0;

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	/**

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	 * Calculate how much memory there is needed for an image of this size in the video-buffer.

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	 * @param width The width of the buffer-to-be.

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	 * @param height The height of the buffer-to-be.

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	 * @return The size needed for the buffer.

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	 */

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	virtual int BufferSize(int width, int height) = 0;

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	virtual ~Blitter() { }

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};

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#endif /* BLITTER_BASE_HPP */