NAME¶
SDL::Surface - Graphic surface structure
CATEGORY¶
Core, Video, Structure
SYNOPSIS¶
use SDL;
use SDL::Video;
use SDL::Surface;
# Create the main surface (display)
SDL::init(SDL_INIT_VIDEO);
my $display = SDL::Video::set_video_mode(640, 480, 16, SDL_SWSURFACE);
# Create other surfaces attached to the $display.
my $surface = SDL::Surface->new(SDL_ASYNCBLIT | SDL_HWSURFACE, 640, 480, 16, 0, 0, 0, 0);
my $surface2 = SDL::Surface->new_from($surface, 100, 100, 8, 0, 0, 0, 0);
DESCRIPTION¶
An "SDL_Surface" defines a surfaceangular area of pixels.
CONSTANTS¶
The constants for SDL::Surface belong to SDL::Video, under the export tag of
':surface'.
- SDL_ASYNCBLIT
- Use asynchronous blit if possible
- SDL_SWSURFACE
- Store in system memory
- SDL_HWSURFACE
- Store in video memory
METHODS¶
new¶
my $surface = SDL::Surface->new(
$flags, $width, $height, $depth, $Rmask, $Gmask, $Bmask, $Amask
);
The constructor creates a new surface with the specified parameter values.
The four mask values are the bits that the channel will ignore. For example, an
Rmask of 0xFF will ignore that channel completely, making everything on the
surface more green/blue.
new_from¶
my $surface = SDL::Surface->new_from(
$surface, $width, $height, $depth, $Rmask, $Gmask, $Bmask, $Amask
);
The constructor creates a new surface with the specified parameter values. The
flags are taken from the specified $surface.
my $w = $surface->w;
Returns the width of the surface. SDL::Surface width is defined at construction
so this is read-only.
my $h = $surface->h;
Returns the height of the surface. SDL::Surface height is defined at
construction so this is read-only.
my $format = $surface->format;
The format of the pixels stored in the surface. See SDL::PixelFormat
pitch¶
my $pitch = $surface->pitch;
The scanline length in bytes.
Direct Write to Surface Pixel¶
Disclaimer: The following methods can be very slow, making them suitable
for creating surfaces, but not for animations
get_pixel¶
my $pixel = $surface->get_pixel( $offset )
Returns the numeric pixel value for the given $offset. The pixel value depends
on current pixel format.
Note: For surfaces with a palette (1 byte per pixel) the palette index is
returned instead of color values.
set_pixels¶
$surface->set_pixels( $offset, $value );
Sets the pixel $value to the given $offset. The pixel value must fit the pixel
format of the surface.
Note: For surfaces with a palette (1 byte per pixel) the palette index
must be passed instead of color values.
Example:
sub putpixel {
my ($x, $y, $color) = @_;
$display->set_pixels( $x + $y * $display->w, $color);
}
See also
examples/pixel_operations/sols/ch02.pl!
get_pixels_ptr¶
my $ptr = $surface->get_pixels_ptr;
Returns a reference to the surface's pixels.
SEE ALSO¶
SDL, SDL::PixelFormat, SDL::Video, SDL::Rect
AUTHORS¶
See "AUTHORS" in SDL.