NAME

raw_surface - Create a new surface using a table as input.

SYNOPSIS

vid
raw_surface( width, height, bytes_per_pixel, input_table, out_file )

DESCRIPTION

This function creates a new 'raw' surface using user-supplied values for pixel data. The internal representation is set to a compile- time system default (typically RGBA 888). If the optional out_file argument is set, a PNG image will also be stored in the APPL_TEMP namespace. Using an out_file is primarily intended as a debugging/developer feature and the actual encode/store operation is synchronous.

NOTES

1

There might be a loss of precision imposed by the texture format native to the system that is running.

2

width and height should be within the compile-time constraints of

MAX_SURFACEW and MAX_SURFACEH , exceeding those dimensions is a terminal state transition.

3

Only acceptable bytes_per_pixel values are 1, 3 and 4. All others are terminal state transitions.

4

All input_table values will be treated as 8-bit unsigned integers.

5

input_table is expected to have exactly width height bytes_per_pixel values, starting at index 1. Any deviation is a terminal state transition.

EXAMPLE

function raw_surface0()
      local rtbl = {};
      local ofs = 1;
      for row=1,64 do
            for col=1,64 do
                  rtbl[ofs+0] = math.random(255);
                  rtbl[ofs+1] = math.random(255);
                  rtbl[ofs+2] = math.random(255);
                  ofs = ofs + 3;
            end
      end
      local vid = raw_surface(64, 64, 3, rtbl);
      show_image(vid);
end