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.
w
my $w = $surface->w;Returns the width of the surface. SDL::Surface width is defined at construction so this is read-only.
h
my $h = $surface->h;Returns the height of the surface. SDL::Surface height is defined at construction so this is read-only.
format
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 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.