(svn r6651) -Coding feature: added the windowevent WE_INVALIDATE_DATA
This gives the ability to invalidate some window data and recalculate as needed instead of doing it for each WE_PAINT

This event is called right away when using InvalidateWindowData(), so it may be a good idea to set a bool or similar in the window
or similar and then act on that bool in WE_PAINT instead of doing a lot of stuff in WE_INVALIDATE_DATA as it might be called more than once before WE_PAINT is called

InvalidateWindowData() will not automatically repaint the window, so if you want to repaint it as well, you need to mark it dirty as well.

Made the depot windows use WE_INVALIDATE_DATA to set when to generate the engine and wagon lists instead of at each redraw
It makes no sense to regenerate the list when say using the scrollbar if we know that no vehicle have entered or left the list

NOTE: currently there is a piece of code to generate the list when it's not needed and compare it to the stored list and assert if they mismatch
This check is somewhat slow and kills the whole idea of WE_INVALIDATE_DATA, so it's a short lived one to verify that InvalidateWindowData() is used everywhere where it's needed

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/* $Id$ */

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#ifndef BMP_H

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#define BMP_H

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typedef struct {

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	uint32 offset;       ///< offset of bitmap data from .bmp file begining

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	uint32 width;        ///< bitmap width

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	uint32 height;       ///< bitmap height

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	bool os2_bmp;        ///< true if OS/2 1.x or windows 2.x bitmap

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	uint16 bpp;          ///< bits per pixel

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	uint32 compression;  ///< compression method (0 = none, 1 = 8-bit RLE, 2 = 4-bit RLE)

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	uint32 palette_size; ///< number of colors in palette

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} BmpInfo;

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typedef struct {

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	Colour *palette;

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	byte   *bitmap;

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} BmpData;

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#define BMP_BUFFER_SIZE 1024

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typedef struct {

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	byte data[BMP_BUFFER_SIZE];

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	int pos;

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	int read;

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	FILE *file;

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	uint real_pos;

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} BmpBuffer;

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void BmpInitializeBuffer(BmpBuffer *buffer, FILE *file);

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bool BmpReadHeader(BmpBuffer *buffer, BmpInfo *info, BmpData *data);

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bool BmpReadBitmap(BmpBuffer *buffer, BmpInfo *info, BmpData *data);

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void BmpDestroyData(BmpData *data);

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#endif /* BMP_H */