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# Class CL_DisplayCard

The display card class.
Contained in: global
Derived from: none
Derived by: none
Group: Display (Display 2D)

#include <ClanLib/display.h>

### public function member index:
### Construction:
``virtual`` | `~CL_DisplayCard` | `()`;
### Operations (Display Functions):
``virtual` `void`` | `flip_display` | `(`bool` `sync`=false)`;
``virtual` `void`` | `put_display` | `(`const` `class` `CL_Rect`& `rect`)`;
``virtual` `void`` | `sync_buffers` | `()`;
``virtual` `void`` | `clear_display` | `(`float` `red`=0, `float` `green`=0, `float` `blue`=0, `float` `alpha`=1)`;
``virtual` `void`` | `set_palette` | `(`CL_Palette`* `palette`)`;
``virtual` `CL_Palette`*` | `get_palette` | `()`;
``virtual` `void`` | `set_videomode` | `(`CL_VidMode`* `mode`)`;
``virtual` `void`` | `set_videomode` | `(`int` `width`, `int` `height`, `int` `bpp`, `bool` `fullscreen` = true, `bool` `allow_resize` = false, `bool` `video_memory` = true)`;
### Attributes:
``virtual` `const` `std::list`<`CL_VidMode`*>&` | `get_videomodes` | `()`;
``virtual` `std::string`` | `get_name` | `()`;
``virtual` `int`` | `get_total_memory` | `()`;
``virtual` `int`` | `get_card_no` | `()`;
``virtual` `bool`` | `is_initialized` | `()`;
``virtual` `CL_Target`*` | `get_target` | `()`;
``virtual` `int`` | `get_width` | `()`;
``virtual` `int`` | `get_height` | `()`;
``virtual` `int`` | `get_bpp` | `()`;
``virtual` `void`` | `push_clip_rect` | `()`;
``virtual` `void`` | `push_clip_rect` | `(`const` `CL_ClipRect`& `rect`)`;
``virtual` `CL_ClipRect`` | `get_clip_rect` | `()`;
``virtual` `void`` | `set_clip_rect` | `(`const` `CL_ClipRect`& `rect`)`;
``virtual` `void`` | `pop_clip_rect` | `()`;
``virtual` `void`` | `push_translate_offset` | `()`;
``virtual` `void`` | `push_translate_offset` | `(`int` `x`, `int` `y`)`;
``virtual` `int`` | `get_translate_offset_x` | `()`;
``virtual` `int`` | `get_translate_offset_y` | `()`;
``virtual` `void`` | `set_translate_offset` | `(`int` `x`, `int` `y`)`;
``virtual` `void`` | `pop_translate_offset` | `()`;
### Operations (Draw Functions):
``virtual` `void`` | `fill_rect` | `(`int` `x1`, `int` `y1`, `int` `x2`, `int` `y2`, `float` `r`, `float` `g`, `float` `b`, `float` `a`)`;
``virtual` `void`` | `draw_rect` | `(`int` `x1`, `int` `y1`, `int` `x2`, `int` `y2`, `float` `r`, `float` `g`, `float` `b`, `float` `a`)`;
``virtual` `void`` | `draw_line` | `(`int` `x1`, `int` `y1`, `int` `x2`, `int` `y2`, `float` `r`, `float` `g`, `float` `b`, `float` `a`)`;
### Signals:
``virtual` `CL_Signal_v2`<`int`, `int`>&` | `sig_resized` | `()`;
``virtual` `CL_Signal_v1`<`const` `CL_Rect`& >&` | `sig_paint` | `()`;

## Description:

This class represents a display card in ClanLib. It is mainly used to set the videomode, flip the display and do simple graphics operations such as filled rectangles or drawing lines.
If you're always only using one display card at the time, you may want to consider using the static functions in CL_Display instead. They do exactly the same, but operates on a selected display card instead (default the primary card). This saves you from passing around a pointer to the displaycard.

## Function Member Descriptions:

CL_DisplayCard::clear_display - Clears backbuffer with the specified color.
``virtual` `void`` `clear_display``(`float` `red`=0, `float` `green`=0, `float` `blue`=0, `float` `alpha`=1)`;

> red - red component of the color.
> green - green component of the color.
> blue - blue component of the color.
> alpha - alpha (transparency) component of the color.

CL_DisplayCard::draw_line - Draw a line from ('x1', 'y1') to ('x2', 'y2') using the color ('r', 'g', 'b', 'a').
``virtual` `void`` `draw_line``(`int` `x1`, `int` `y1`, `int` `x2`, `int` `y2`, `float` `r`, `float` `g`, `float` `b`, `float` `a`)`;

> x1 - Leftmost x-coordinate. //FIXME
> y1 - Upper y-coordinate.
> x2 - Rightmost x-coordinate.
> y2 - Lower y-coordinate.
> r - Red component of the filled color.
> g - Green component of the filled color.
> b - Blue component of the filled color.
> a - Alpha component of the filled color.

CL_DisplayCard::draw_rect - Draw a rectangle from ('x1', 'y1') to ('x2', 'y2') using the color ('r', 'g', 'b', 'a').
``virtual` `void`` `draw_rect``(`int` `x1`, `int` `y1`, `int` `x2`, `int` `y2`, `float` `r`, `float` `g`, `float` `b`, `float` `a`)`;

> x1 - Leftmost x-coordinate.
> y1 - Upper y-coordinate.
> x2 - Rightmost x-coordinate.
> y2 - Lower y-coordinate.
> r - Red component of the filled color.
> g - Green component of the filled color.
> b - Blue component of the filled color.
> a - Alpha component of the filled color.

CL_DisplayCard::fill_rect - Draw a filled rectangle from ('x1', 'y1') to ('x2', 'y2') using the color ('r', 'g', 'b', 'a').
``virtual` `void`` `fill_rect``(`int` `x1`, `int` `y1`, `int` `x2`, `int` `y2`, `float` `r`, `float` `g`, `float` `b`, `float` `a`)`;

> x1 - Leftmost x-coordinate.
> y1 - Upper y-coordinate.
> x2 - Rightmost x-coordinate.
> y2 - Lower y-coordinate.
> r - Red component of the filled color.
> g - Green component of the filled color.
> b - Blue component of the filled color.
> a - Alpha component of the filled color.

CL_DisplayCard::flip_display - Flips the front and backbuffer. Everything is normally drawn to the backbuffer, and flip_display() needs to be called before it can be seen onto the screen.
``virtual` `void`` `flip_display``(`bool` `sync`=false)`;

> sync - VSync on/off

CL_DisplayCard::get_bpp - Returns the depth of the current video mode.
``virtual` `int`` `get_bpp``()`;

> Returns - Depth of video mode.

CL_DisplayCard::get_card_no - Get card number.
``virtual` `int`` `get_card_no``()`;

> Returns - Card number.

CL_DisplayCard::get_clip_rect - Returns the current clipping rectangle.
``virtual` `CL_ClipRect`` `get_clip_rect``()`;

> Returns - The current clipping rectangle.

CL_DisplayCard::get_height - Returns the height of the current video mode.
``virtual` `int`` `get_height``()`;

> Returns - Height of video mode.

CL_DisplayCard::get_name - Get name of the card.
``virtual` `std::string`` `get_name``()`;

> Returns - Returns the card name.

CL_DisplayCard::get_palette - Return the current system palette on this card.
``virtual` `CL_Palette`*` `get_palette``()`;

> Returns - The system palette.

CL_DisplayCard::get_target - Return either NULL or the Target that is blitted to (aka Framebuffer)
``virtual` `CL_Target`*` `get_target``()`;

> Returns - NULL if Framebuffer access is not possible, CL_Target if it is

CL_DisplayCard::get_total_memory - Get videomemory available.
``virtual` `int`` `get_total_memory``()`;

> Returns - Videomemory available, or -1 if unknown.

CL_DisplayCard::get_translate_offset_x - Returns the current effective x-axis translation offset.
``virtual` `int`` `get_translate_offset_x``()`;

CL_DisplayCard::get_translate_offset_y - Returns the current effective y-axis translation offset.
``virtual` `int`` `get_translate_offset_y``()`;

CL_DisplayCard::get_videomodes - Get list of videomodes available on this card.
``virtual` `const` `std::list`<`CL_VidMode`*>&` `get_videomodes``()`;

> Returns - Returns the list of videomodes.

CL_DisplayCard::get_width - Returns the width of the current video mode.
``virtual` `int`` `get_width``()`;

> Returns - Width of video mode.

CL_DisplayCard::is_initialized - Returns true if the display card is in a video mode.
``virtual` `bool`` `is_initialized``()`;

> Returns - true if initialized.

CL_DisplayCard::pop_clip_rect - Pop the clipping rectangle last pushed onto the stack.
``virtual` `void`` `pop_clip_rect``()`;

CL_DisplayCard::pop_translate_offset - Pops the last pushed translation offset from the translation offset stack. If the stack is empty, nothing will happen, and if the last translation offset is popped, the translation offset will be set to 0,0
``virtual` `void`` `pop_translate_offset``()`;

CL_DisplayCard::push_clip_rect - Pushes the current clipping rectangle onto the cliprect stack.
``virtual` `void`` `push_clip_rect``()`;

CL_DisplayCard::push_clip_rect - Pushes the current clipping rectangle onto the cliprect stack. It then clips the passed rectangle 'rect' with the current one, and uses the result as the new clipping rect.
``virtual` `void`` `push_clip_rect``(`const` `CL_ClipRect`& `rect`)`;

> rect - The new clipping rectangle to be with the old one and then used.

CL_DisplayCard::push_translate_offset - Pushes the current translation rectangle onto the cliprect stack.
``virtual` `void`` `push_translate_offset``()`;

CL_DisplayCard::push_translate_offset - Push translation offset onto translation stack. This offset will affect any subsequent display operations on the displaycard, by translating the position of the display operation with the offset. The offset will be offset by any previous offsets pushed onto the stack, eg. it inherits the previous offset.
``virtual` `void`` `push_translate_offset``(`int` `x`, `int` `y`)`;

CL_DisplayCard::put_display - Copies the specified area of the backbuffer to the front buffer. This is in particular useful if you only want to update a limited region, and not do a full-blown flipping.
``virtual` `void`` `put_display``(`const` `class` `CL_Rect`& `rect`)`;

CL_DisplayCard::set_clip_rect - Sets the current clipping rectangle. This is an absolute set, so it doesn't get clipped with the previous one.
``virtual` `void`` `set_clip_rect``(`const` `CL_ClipRect`& `rect`)`;

CL_DisplayCard::set_palette - Set system palette on this card.
If the display card is in a non-palettelized mode, this will be the palette used when surfaceproviders doesn't specify a palette themself.
``virtual` `void`` `set_palette``(`CL_Palette`* `palette`)`;

> palette - Palette to use as new system palette.

CL_DisplayCard::set_translate_offset - Sets the translation offset as a new absolute translation offset. The new offset will disregard any previous offset's, but will not empty the translation stack. The new translation offset will affect any subsequent display operations on the displaycard, by translating the position of the display operation with the offset
``virtual` `void`` `set_translate_offset``(`int` `x`, `int` `y`)`;

CL_DisplayCard::set_videomode - Change the display card's video mode.
``virtual` `void`` `set_videomode``(`CL_VidMode`* `mode`)`;

> mode - videomode to be changed to.

CL_DisplayCard::set_videomode - Change the display card's video mode.
``virtual` `void`` `set_videomode``(`int` `width`, `int` `height`, `int` `bpp`, `bool` `fullscreen` = true, `bool` `allow_resize` = false, `bool` `video_memory` = true)`;

> width - width in pixels of the new video mode.
> height - height in pixels of the new video mode.
> bpp - Bits per pixel. The depth of the new video mode. (8, 16, 24, 32)
> video_memory - Use video memory if possible. System memory may be faster if alpha blending is used a lot.

CL_DisplayCard::sig_paint - Returns the paint signal for the display card.
Use this signal to listen for invalidated screen areas that need to be repainted.
The parameter passed by the signal is the area that need a repaint.
``virtual` `CL_Signal_v1`<`const` `CL_Rect`& >&` `sig_paint``()`;

CL_DisplayCard::sig_resized - Returns the resize signal for the display card.
You can use this signal to listen for window resize events.
The parameters passed by the signal are the new width and height of the window.
``virtual` `CL_Signal_v2`<`int`, `int`>&` `sig_resized``()`;

CL_DisplayCard::sync_buffers - Copies the contents of the frontbuffer to all other buffers (usually just the backbuffer). This ensures that all buffers contain the same image.
``virtual` `void`` `sync_buffers``()`;

CL_DisplayCard::~CL_DisplayCard - Display Card Destructor
``virtual`` `~CL_DisplayCard``()`;