VideoSystem

In file libs/cs2d/dosraw/djvidsys.h:

class VideoSystem

Auxiliary helper class for SysGraphics2D when not using Allegro
This video driver can use back buffers if enough video RAM is available: this allows us to use page flip instead of copy operation which is substantialy faster

Public Methods
unsigned char* BackBuffer(): Return address of back buffer
void Clear(int Color): Clear current buffer
void Close(): Close graphics screen
bool DoubleBuffer(): Return double buffering state
bool DoubleBuffer(bool Enable): Enable or disable double buffering
bool FindMode(int Width, int Height, int Depth, int &PaletteSize, long &RedMask, long &GreenMask, long &BlueMask): Find closest vide mode; return false if failed; maybe set W & H to closest
void Flush(int x, int y, int w, int h): Flushes double buffer out to VRAM
inline int GetPage(): Return active video page
void GetPalette(RGBpaletteEntry *Palette, int iColors): Puts current pal in Palette
int Open(): Open graphics screen; return error code
void SetPalette(RGBpaletteEntry *Palette, int iColors): Writes out Palette
VideoSystem(): Video susbsystem constructor: fix up Width and Height to closest possible
inline void WaitVRetrace(bool Enable): Enable/disabling wait for vertical retrace
~VideoSystem(): Video susbsystem destructor

Private Fields
unsigned int BytesPerPixel: Bytes per pixel
unsigned int BytesPerScanLine: Bytes per scan line
bool IsBanked: Is selected video mode banked?
bool IsXmode: Is selected video mode a X-mode?
int PageSize: Size of one videopage
unsigned int ScanLinesPerPage: Scan lines per page
int ScreenSize: Screen image size
bool UseDoubleBuffering: Use two videopages if available?
int VESAversion: VESA BIOS extensions version number
int VideoMode: Selected video mode number
unsigned int VideoPage: Current video page we are writing to
int VideoPages: How many linearly addressable video pages fits in video RAM?
unsigned int VideoRAM: Total amount of video RAM on board
unsigned char* VRAM: A pointer to linearly mapped video RAM
unsigned char* VRAMBuffer: Second buffer if it is not available in video RAM
unsigned short VRAMSelector: Selector of video RAM if linear address unavailable
bool WaitVR: Wait for vertical retrace when switching pages?
unsigned int WindowGranularity: VESA SVGA window granularity
unsigned int WindowSize: VESA SVGA window size

Documentation

Auxiliary helper class for SysGraphics2D when not using Allegro
This video driver can use back buffers if enough video RAM is available: this allows us to use page flip instead of copy operation which is substantialy faster