gfx_point.c

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/* pixel retrieving */

#include "fb_gfx.h"


/*:::::*/
FBCALL int fb_GfxPoint(void *target, float fx, float fy)
{
        FB_GFXCTX *context = fb_hGetContext();
        int x, y;
        unsigned int color;

        if (!__fb_gfx)
                return -1;

        if( fy == -8388607.0 )
                return fb_GfxCursor(fx);

        fb_hPrepareTarget(context, target);
        fb_hSetPixelTransfer(context, MASK_A_32);

        fb_hTranslateCoord(context, fx, fy, &x, &y);

        if ((x < context->view_x) || (y < context->view_y) ||
            (x >= context->view_x + context->view_w) || (y >= context->view_y + context->view_h))
                return -1;

        DRIVER_LOCK();
        color = context->get_pixel(context, x, y);
        DRIVER_UNLOCK();

        if (__fb_gfx->depth == 16)
                /* approximate: for each component we also report high bits in lower bits of new value */
                color = (((color & 0x001F) << 3) | ((color >> 2) & 0x7) |
                         ((color & 0x07E0) << 5) | ((color >> 1) & 0x300) |
                         ((color & 0xF800) << 8) | ((color << 3) & 0x70000));

        return (int)color;
}