SDLx::Surface

Section: User Contributed Perl Documentation (3)
Updated: 2020-07-28
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NAME

SDLx::Surface - Graphic surface matrix extension  

CATEGORY

Extension  

SYNOPSIS

 use SDL;
 use SDL::Video;
 use SDLx::Surface;

 # Create the main surface (display)
 SDL::init(SDL_INIT_VIDEO);
 my $display = SDL::Video::set_video_mode(640, 480, 16, SDL_SWSURFACE);

 my $surf_matrix = SDLx::Surface->new( surface => $display);
 
 $surf_matrix->[10][10] = 0xFFFF; #for 16bpp write white at x = 10 and y=10

 $surf_matrix->surface( $new_surface );

 my $orig_surface = $surf_matrix->surface();

 

DESCRIPTION

An "SDLx::Surface" allows matrix read and write to a surface, safely.  

CONSTRUCTOR

 

new

Takes a SDL::Surface in hash format.

If a surface is passed to 'surface =>' that is loaded. Otherwise you can define at least a width and a height.

        SDLx::Surface->new(  surface => $surface) # The $surface is loaded

        SDLx::Surface->new( width=> 400, height=>200) 
                # A SDL::Surface->new( SDL_ANYFORMAT, 400, 200, 32) is loaded

        SDLx::Surface->new( width=> 400, height=>200, flags=> SDL_SWSURFACE, depth=>24 ) 
                # A SDL::Surface->new( SDL_SWSURFACE, 400, 200, 24) is loaded 

        SDLx::Surface->new( width=> 400, height=>200, flags=> SDL_SWSURFACE, depth=>32, greenmask=>0xFF000000 )
                # A SDL::Surface->new( SDL_ANYFORMAT, 400, 200, 32, 0, 0xFF000000,0, 0, 0 ) is loaded
        SDLx::Surface->new( w => 1, h => 1, color => 0xFF0000FF )
                # A SDL::Surface->new( SDL_ANYFORMAT, 1, 1, 32, 0, 0, 0, 0 ) is loaded
                all pixels are colored with color (red)

 

display

If SDLx::App::new or SDL::Video::get_video_mode called before then:

 my $appx = SDLx::Surface::display();

gets the display if it is already made. Passed options are ignored. Otherwise you can quickly make the display with :

 SDLx::Surface::display( width => 20, height => 20) #depth => 32 and SDL_ANYFORMAT used

or you can also pass flags and depth.

 SDLx::Surface::display( width => 20, height => 20, flags=> SDL_HWSURFACE, depth=>24)

You can also use the keys "w" and "h" in place of "width" and "height", as with "new".

Get or create the main display surface and attach to a "SDLx::Surface".  

duplicate

Does a attributes only, no pixel, copy of another SDLx::Surface.  

ATTRIBUTES

 

surface

If a SDL::Surface is passed it is attached to the matrix. Returns the SDL::Surface that is currently attached to this SDLx::Surface  

w, h, format, pitch, flags

Returns the inner SDL::Surface's respective attribute. See "SDL::Surface".  

clip_rect

Sets the passed "SDL::Rect" as the new clip_rect for the surface. Returns the SDL::Surface's clip_rect. See SDL::Video::get_clip_rect and SDL::Video::set_clip_rect. =head1 EXTENSIONS  

load

 my $surface = SDLx::Surface->load( 'hero.png' );
 my $surface = SDLx::Surface->load( 'hero.dat', 'bmp' );

Loads the given image file into a new SDLx::Surface surface. A new surface is always created, even if you call it from an already crafted object. Croaks on errors such as no support built for that image extension or a file reading error (the error message is SDL::get_error and should give more details).

Note that load() will automatically figure out the extension based on the filename you provide. If you wish to force an extension for whatever reason (like having a filename with a different extension or none at all), you can optionally pass the file type as a second parameter. Case is not relevant.

If you don't have SDL_image in your build, only bitmap images will be supported.

Returns the new Surface.  

blit

 $sdlx_surface->blit( $dest, $src_rect, $dest_rect );

Blits "SDLx::Surface" onto $dest surface. $src_rect or $dest_rect are optional. If $src_rect is omitted, it will be the size of the entire surface. If $dest_rect is omitted, it will be blitted at "(0, 0)". $src_rect or $dest_rect can be array refs or "SDL::Rect". $dest can be "SDLx::Surface" or "SDL::Surface".

Note that the final blit rectangle is stored in $dest_rect after clipping is performed.

Returns $self  

blit_by

 $sdlx_surface->blit_by( $src, $src_rect, $dest_rect );

Does the same as "blit" but the "SDLx::Surface" is the one being blitted to. This is useful when the surface you have isn't an "SDLx::Surface", but the surface it is being blitted to is.

Note that the final blit rectangle is stored in $dest_rect after clipping is performed.  

flip

Applies SDL::Video::flip to the Surface, with error checking.

Returns $self  

update

 $sdlx_surface->update(); # whole surface is updated
 $sdlx_surface->update([0,0,1,1]); # only that area (0,0,1,1) is updated
 
 $sdlx_surface->update( [ SDL::Rect->new(0,0,1,2) ... ]); # defined rects are updated

Applies SDL::Video::update_rect for no rect or 1 array ref. Applies SDL::Video::update_rects for array of SDL::Rects.

Returns $self  

draw_rect

 $sdlx_surface->draw_rect( [$x,$y,$w,$h], 0xFFFF00FF );
 $sdlx_surface->draw_rect( SDL::Rect->new($x,$y,$w,$h), 0xFFFF00FF );

Draws a rect on the surface with the given color. If the rect is omitted, the colored rect will be drawn to the entire surface.

Returns $self  

draw_line

 $sdlx_surface->draw_line( [$x1, $y1], [$x2, $y2], $color, $antialias); # $color is a number
 $sdlx_surface->draw_line( [$x1, $y1], [$x2, $y2], \@color, $antialias); #

Draws a line on the surface. Antialias is turned on if $antialias is true.

Returns $self  

draw_circle

 $sdlx_surface->draw_circle( [$x1, $y1], $radius, \@color, $antialias );

Draws an unfilled circle at "($x1,$y1)" of size $radius and $color. Antialias is turned on if $antialias is true. Returns $self  

draw_circle_filled

 $sdlx_surface->draw_circle_filled( [$x1, $y1], $radius, \@color );

Draws an filled circle at "($x1,$y1)" of size $radius and $color. Antialias is turned on automatically. Returns $self  

draw_trigon

 $sdlx_surface->draw_trigon( [ [$x1, $y1], [$x2, $y2], [$x3, y3] ], \@color, $antialias );

Draws an unfilled trigon (triangle) with vertices "($x1,$y1)", "($x2,$y2)", "($x3,$y3)" and $color. Antialias is turned on if $antialias is true. Returns $self  

draw_trigon_filled

 $sdlx_surface->draw_trigon_filled( [ [$x1, $y1], [$x2, $y2], [$x3, y3] ], \@color );

Draws an filled trigon (triangle) with vertices "($x1,$y1)", "($x2,$y2)", "($x3,$y3)" and $color. Antialias is turned on automatically. Returns $self  

draw_polygon

 $sdlx_surface->draw_polygon( [ [$x1, $y1], [$x2, $y2], [$x3, y3], ... ], \@color, $antialias );

Draws an unfilled polygon with vertices "($xN,$yN)" and $color. Antialias is turned on if $antialias is true. Returns $self  

draw_polygon_filled

 $sdlx_surface->draw_polygon_filled( [ [$x1, $y1], [$x2, $y2], [$x3, y3], ... ], \@color );

Draws an filled polygon with vertices "($xN,$yN)" and $color. Antialias is turned on automatically. Returns $self  

draw_arc

 $sdlx_surface->draw_arc( [ $x, $y ], $radius, $start, $end, $color );

Draws an arc around "($x,$y)" with $radius, $start radius, $end radius and $color.

Returns $self  

draw_ellipse

 $sdlx_surface->draw_ellipse( [ $x, $y ], $rx, $ry, $color );

Draws an unfilled ellipse centered at "($x,$y)" with horizontal radius $rx, vertical radius $ry and $color. Antialias is turned on if $antialias is true.

Returns $self  

draw_ellipse_filled

 $sdlx_surface->draw_ellipse_filled( [ $x, $y ], $rx, $ry, $color );

Draws an filled ellipse centered at "($x,$y)" with horizontal radius $rx, vertical radius $ry and $color. Antialias is turned on automatically.

Returns $self  

draw_bezier

 $sdlx_surface->draw_bezier( [ [$x1, $y1], [$x2, $y2], [$x3, y3], ... ], $s, $color );

Draws a bezier curve of points "($xN,$yN)" using $s steps for interpolation and $color. Antialias is turned on automatically.

Returns $self  

draw_gfx_text

Draw text using gfx (not pretty but fast) at give vector, color.

 $surf->draw_gfx_text( [0,0], 0xffffffff, "fooo");
 $surf->draw_gfx_text( [10,10], [20,20,20,20], "fooo");

You can also set the gfx font but passing a hash reference as shown below.

 my $f = '';
 open( my $FH, '<', 'test/data/5x7.fnt');
 binmode ($FH);
 read($FH, $f, 4096);
 close ($FH);
 
 my $font =  {data=>$f, cw => 5, ch => 7};
 $surf->draw_gfx_text( [0,0], 0xffffffff, "fooo", $font );

Returns $self  

AUTHORS

See ``AUTHORS'' in SDL.


 

Index

NAME
CATEGORY
SYNOPSIS
DESCRIPTION
CONSTRUCTOR
new
display
duplicate
ATTRIBUTES
surface
w, h, format, pitch, flags
clip_rect
load
blit
blit_by
flip
update
draw_rect
draw_line
draw_circle
draw_circle_filled
draw_trigon
draw_trigon_filled
draw_polygon
draw_polygon_filled
draw_arc
draw_ellipse
draw_ellipse_filled
draw_bezier
draw_gfx_text
AUTHORS