nsgif__deinterlace()

static bool fl::third_party::nsgif__deinterlace ( fl::u32 height, fl::u32 * y, fl::u8 * step )

inlinestatic

Get the next line for GIF decode.

Note that the step size must be initialised to 24 at the start of the frame (when y == 0). This is because of the first two passes of the frame have the same step size of 8, and the step size is used to determine the current pass.

Parameters

[in]	height	Frame height in pixels.
[in,out]	y	Current row, starting from 0, updated on exit.
[in,out]	step	Current step starting with 24, updated on exit.

Returns

true if there is a row to process, false at the end of the frame.

Definition at line 365 of file gif.cpp.hpp.

{
    *y += *step & 0xf;
 
    if (*y < height) return true;
 
    switch (*step) {
    case 24: *y = 4; *step = 8; if (*y < height) return true;
             /* Fall through. */
    case  8: *y = 2; *step = 4; if (*y < height) return true;
             /* Fall through. */
    case  4: *y = 1; *step = 2; if (*y < height) return true;
             /* Fall through. */
    default:
        break;
    }
 
    return false;
}

References FL_NOEXCEPT, fl::height, fl::step(), and fl::y.

Referenced by nsgif__next_row().

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