NAME

SDL::Surface - Graphic surface structure.

CATEGORY

Core, Video, Structure

SYNOPSIS

The main surface (display) is provided by SDL::Video::set_video_mode. use SDL; #provides flags & constants use SDL::Video; #provides access to set_video_mode use SDL::Surface; #provides access to SDL_Surface struct internals

  SDL::init(SDL_INIT_VIDEO); 
  my $display = SDL::Video::set_video_mode(); 
 

All surfaces constructed from now on are attached to the $display. There are two constructors available to do this.

  my $surface  = SDL::Surface->new ( ... ); 
  my $surface2 = SDL::Surface->new_from ( surface, ... ); 
  

DESCRIPTION

An SDL_Surface defines a surfaceangular area of pixels.

CONSTANTS

The constants are exported by default. You can avoid this by doing:

 use SDL::Video ();

and access them directly:

 SDL::Video::SDL_SWSURFACE;

Available constants: see "flags"

METHODS

new ( flags, width, height, depth, Rmask, Gmask, Bmask, Amask )

The constructor creates a new surface with the specified parameter values.

    my $surface = SDL::Surface->new( ... );

new_from ( surface, width, height, depth, Rmask, Gmask, Bmask, Amask )

The constructor creates a new surface with the specified parameter values.

    my $surface = SDL::Surface->new_from( $old_surface, ... );

Construtor Parameters

flags

Available flags for new() are exported by SDL::Video

SDL_ASYNCBLIT

Use asynchronous blit if possible

SDL_SWSURFACE

Stored in the system memory.

SDL_HWSURFACE

Stored in video memory

w

SDL::Surface width are defined at construction. Thus the following is read only.

  my $w = $surface->w; 
  

h

SDL::Surface height are defined at construction. Thus the following is read only.

  my $h = $surface->h; 

format

The format of the pixels stored in the surface. See SDL::PixelFormat

 my $format = $surface->format;

pitch

 my $pitch = $surface->pitch;

SDL::Surface's scanline length in bytes

clip_rect

To get the surface's clip_rect we the following

 my $clip_rect = SDL::Rect->new(0,0,0,0);
 SDL::Video::get_clip_rect($surface, $clip_rect);

To set the surface's clip_rect use the following

 my $clip_rect = SDL::Rect->new(2,23,23,542);
 SDL::Video::set_clip_rect($surface, $clip_rect);

Direct Write to Surface Pixel

Disclaimer: This can be very slow, it is suitable for creating surfaces one time and not for animations

get_pixels

 $surface->get_pixels( $offset )  

Returns the current integer value at (surface->pixels)[offset]

set_pixels

 $surface->set_pixels( $offset, $value );

Sets the current integer to $value at (surface->pixels)[offset]

Usage

  sub putpixel
  {
        my($x, $y, $color) = @_;
        my $lineoffset = $y * ($screen->pitch / $depth_in_bytes); 
        $screen->set_pixels( $lineoffset+ $x, $color);
  }

Note: $depth_in_bytes for 32 is 4, 16 is 2, 8 is 1;

See also examples/sols/ch02.pl

get_pixels_ptr

 $surface->get_pixels_ptr();

Returns the C ptr to this surfaces's pixels

SEE ALSO

SDL, SDL::PixelFormat, SDL::Video, SDL::Rect

cpanm SDL

perl -MCPAN -e shell
install SDL