chitralekha.h

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#ifndef __CHITRALEKHA_H__
#define __CHITRALEKHA_H__
 
#include <stdint.h>
#include <_xeneva.h>
 
#ifdef __cplusplus
XE_EXTERN {
#endif
 
    typedef struct _ChCanvas_ {
        int graphics_fd;
        uint32_t screenWidth;
        uint32_t screenHeight;
        uint32_t bpp;
        uint16_t scanline;
        uint32_t pitch;
        uint32_t canvasWidth;
        uint32_t canvasHeight;
        uint32_t* buffer;
        size_t bufferSz;
        uint32_t* framebuff;
    } ChCanvas;
 
    XE_LIB int ChPrintLibName();
 
    /*
    * ChCreateCanvas -- creates a new canvas
    * @param reqW -- requested width of the canvas
    * @param reqH -- requested height of the canvas
    */
    XE_LIB ChCanvas* ChCreateCanvas(int reqW, int reqH);
 
    /*
    * ChAllocateBuffer -- allocates buffers for graphics
    * @param canvas -- Pointer to canvas
    */
    XE_LIB int ChAllocateBuffer(ChCanvas * canvas);
 
    /*
    * ChDeAllocateBuffer -- de-allocates buffers from
    * canvas
    * @param canvas -- pointer to canvas structure
    */
    XE_LIB int ChDeAllocateBuffer(ChCanvas * canvas);
 
    /*
    * ChCanvasScreenUpdate -- updates screen buffer with canvas buffer
    * contents
    * @param canvas -- Pointer to canvas
    * @param x -- x position
    * @param y -- y position
    * @param w -- width of the canvas
    * @param h -- height of the canvas
    */
    XE_LIB void ChCanvasScreenUpdate(ChCanvas * canvas, int x, int y, int w, int h);
 
    /* Orders a completed batch of framebuffer stores. Keep this outside the
     * scanline copy primitive so one presentation does not issue a full-system
     * barrier for every row. */
    XE_LIB void ChCanvasScreenCommit();
 
    /*
    * ChDrawPixel -- draws a pixel to canvas buffer
    * @param canvas -- pointer to canvas
    * @param x -- x position
    * @param y -- y position
    * @param color -- color of the pixel
    */
    XE_LIB void ChDrawPixel(ChCanvas * canvas, int x, int y, uint32_t color);
 
    /*
     * ChDrawPixelRAW -- draws a pixel to canvas buffer
     * @param canvas -- pointer to canvas
     * @param x -- x position
     * @param y -- y position
     * @param color -- color of the pixel
     */
    XE_LIB void ChDrawPixelRAW(ChCanvas * canvas, int x, int y, uint32_t color);
 
    /*
     * ChDrawPixelAA -- draw anti-aliased pixel
     * @param canv - Pointer to canvas
     * @param x -- X location relative to window
     * @param y -- Y location relative to window
     * @param color -- Color of the pixel
     * @param alpha -- Alpha value
     */
    XE_LIB void ChDrawPixelAA(ChCanvas * canv, int x, int y, uint32_t color, double alpha);
 
    /*
    * ChGetPixel -- retuns a pixel from canvas
    * @param canvas -- Pointer to canvas structure
    * @param x -- x position
    * @param y -- y position
    */
    XE_LIB uint32_t ChGetPixel(ChCanvas * canvas, int x, int y);
 
    /*
    * ChCanvasFill -- fill the canvas with specific color
    * @param canvas -- pointer to canvas structure
    * @param w -- width to fill
    * @param h -- height to fill
    * @param color -- color to be filled with
    */
    XE_LIB void ChCanvasFill(ChCanvas * canvas, int w, int h, uint32_t color);
 
    /*
    * ChGetScreenDiagonal -- get screen diagonal using
    * pythagorean theorem in centimetre
    * @param canv -- Pointer to canvas
    */
    XE_LIB float ChGetScreenDiagonal(ChCanvas * canv);
 
    /*
    * ChGetScreenDPI -- converts screen resolution into
    * dot-per-inch in centimetre
    * @param canv -- Pointer to canvas
    */
    XE_LIB float ChGetScreenDPI(ChCanvas * canv);
 
    /*
    * ChGetScreenAspectRatio -- returns the aspect ration of the
    * screen
    * @param canv -- Pointer to canvas
    */
    XE_LIB int ChGetScreenAspectRatio(ChCanvas * canv);
 
#ifdef __cplusplus
}
#endif
 
#endif