SDL::Surface(3) User Contributed Perl Documentation SDL::Surface(3)NAMESDL::Surface - a SDL perl extension
SYNOPSIS
use SDL::Surface;
$image = new SDL::Surface(-name=>"yomama.jpg");
DESCRIPTION
The "SDL::Surface" module encapsulates the SDL_Surface* structure, and
many of its ancillatory functions. Not only is it a workhorse of the
OO Layer, it is the base class for the "SDL::App" class.
EXPORTS
SDL_SWSURFACE SDL_HWSURFACE
SDL_ASYNCBLIT SDL_ANYFORMAT
SDL_HWPALETTE SDL_DOUBLEBUF
SDL_FULLSCREEN SDL_OPENGL
SDL_OPENGLBLIT SDL_RESIZEABLE
SDL_NOFRAME SDL_SRCCOLORKEY
SDL_RLEACCEL SDL_SRCALPHA
SDL_PREALLOC
METHODS
new (-name => 'foo.png')
The "SDL::Surface" class can be instantiated in a number of different
ways. If support for the SDL_image library was included when SDL_perl
was compiled, the easiest way to create a new surface is to use the
"SDL::Surface::new" method with the "-name" option. This will load the
image from the file and return an object encapsulating the
SDL_Surface*.
new (-from => $buffer, ... )
If the contents of the new Surface is already in memory,
"SDL::Surface::new" may be called with the "-from" option to create an
image from that section of memory. This method takes the following
additional parameters:
· -width the width of the image in pixels
· -height the height of the image in pixels
· -depth the number of bits per pixel
· -pitch the number of bytes per line
· -Rmask an optional bitmask for red
· -Gmask an optional bitmask for green
· -Bmask an optional bitmask for green
· -Amask an optional bitmask for alpha
new ( -flags => SDL_SWSURFACE, ... )
Finally, "SDL::Suface::new" may be invoked with the "-flags" option, in
a similar fashion to the "-from" directive. This invocation takes the
same additional options as "-from" with the exception of "-pitch" which
is ignored. This method returns a new, blank, SDL::Surface option with
any of the following flags turned on:
· SWSURFACE() a non-accelerated surface
· HWSURFACE() a hardware accelerated surface
· SRCCOLORKEY() a surface with a transperant color
· SRCALPHA() an alpha blended, translucent surface
flags ()
"SDL::Surface::flags" returns the flags with which the surface was
initialized.
palette ()
"SDL::Surface::palette" currently returns a SDL_Palette*, this may
change in future revisions.
bpp ()
"SDL::Surface::bpp" returns the bits per pixel of the surface
bytes_per_pixel ()
"SDL::Surface::bytes_per_pixel" returns the bytes per pixel of the
surface
Rshift ()
"SDL::Surface::Rshift" returns the bit index of the red field for the
surface's pixel format
Gshift ()
"SDL::Surface::Gshift" returns the bit index of the green field for the
surface's pixel format
Bshift ()
"SDL::Surface::Bshift" returns the bit index of the blue field for the
surface's pixel format
Ashift ()
"SDL::Surface::Ashift" returns the bit index of the alpha field for the
surface's pixel format
Rmask ()
"SDL::Surface::Rmask" returns the bit mask for the red field for teh
surface's pixel format
Gmask ()
"SDL::Surface::Gmask" returns the bit mask for the green field for teh
surface's pixel format
Bmask ()
"SDL::Surface::Bmask" returns the bit mask for the blue field for teh
surface's pixel format
Amask ()
"SDL::Surface::Amask" returns the bit mask for the alpha field for teh
surface's pixel format
color_key ()
"SDL::Surface::color_key" returns the current color key for the image,
which can be set with the "SDL::Surface::set_color_key" method. Before
calling "SDL::Surface::color_key" on a image, you should fist call
"SDL::Surface::display_format" to convert it to the same format as the
display. Failure to do so will result in failure to apply the correct
color_key.
alpha ()
"SDL::Surface::alpha" returns the current alpha value for the image,
which can be set with the "SDL::Surface::set_alpha" method.
width ()
"SDL::Surface::width" returns the width in pixels of the surface
height ()
"SDL::Surface::height" returns the height in pixels of the surface
pitch ()
"SDL::Surface::pitch" returns the width of a surface's scanline in
bytes
pixels ()
"SDL::Surface::pixels" returns a Uint8* to the image's pixel data.
This is not inherently useful within perl, though may be used to pass
image data to user provided C functions.
pixel (x,y,[color])
"SDL::Surface::pixel" will set the color value of the pixel at (x,y) to
the given color if provided. "SDL::Surface::pixel" returns a
SDL::Color object for the color value of the pixel at (x,y) after any
possible modifications.
fill (rect,color)
"SDL::Surface::fill" will fill the given SDL::Rect rectangle with the
specified SDL::Color This function optionally takes a SDL_Rect* and a
SDL_Color*
lockp ()
"SDL::Surface::lockp" returns true if the surface must be locked
lock ()
"SDL::Surface::lock" places a hardware lock if necessary, preventing
access to the surface's memory
unlock ()
"SDL::Surface::unlock" removes any hardware locks, enabling blits
update ( rects...)
"SDL::Surface::update" takes one or more SDL::Rect's which determine
which sections of the image are to be updated. This option is only
useful on the appliaction surface.
flip ()
"SDL::Surface::flip" updates the full surface, using a double buffer if
available
blit (srect,dest,drect)
"SDL::Surface::blit" blits the current surface onto the destination
surface, according to the provided rectangles. If a rectangle is 0,
then the full surface is used.
set_colors (start,colors...)
"SDL::Surface::set_colors" updates the palette starting at index
"start" with the supplied colors. The colors may either be SDL::Color
objects or SDL_Color* from the low level C-style API.
set_color_key (flag,pixel) or (flag,x,y)
"SDL::Surface::set_color_key" sets the blit flag, usually
SDL_SRCCOLORKEY, to the specified SDL::Color object. Optional a
SDL_Color* may be passed.
set_alpha (flag,alpha)
"SDL::Surface::set_alpha" sets the opacity of the image for alpha
blits. "alpha" takes a value from 0x00 to 0xff.
display_format ()
"SDL::Surface::display_format" converts the surface to the same format
as the current screen.
rgb () "SDL::Surface::rgb" converts the surface to a 24 bit rgb format
regardless of the initial format.
rgba () "SDL::Surface::rgba" converts the surface to a 32 bit rgba format
regarless of the initial format.
print (x,y,text...)
"SDL::Surface::print" renders the text using the current font onto the
image. This option is only supported for with SDL_image and SFont.
save_bmp (filename)
"SDL::Surface::save_bmp" saves the surface to filename in Windows BMP
format.
video_info ()
"SDL::Surface::video_info" returns a hash describing the current state
of the video hardware.
AUTHOR
David J. Goehrig
SEE ALSO
perl SDL::App SDL::Color SDL::Palette SDL::Rect
perl v5.14.1 2011-07-18 SDL::Surface(3)
