From 7b52cc13af4e85f1ca2deb6b6c77de9c95ea0dcf Mon Sep 17 00:00:00 2001 From: scuri Date: Fri, 17 Oct 2008 06:10:33 +0000 Subject: First commit - moving from LuaForge to SourceForge --- html/en/drv/dbuf.html | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 html/en/drv/dbuf.html (limited to 'html/en/drv/dbuf.html') diff --git a/html/en/drv/dbuf.html b/html/en/drv/dbuf.html new file mode 100644 index 0000000..37b5c89 --- /dev/null +++ b/html/en/drv/dbuf.html @@ -0,0 +1,71 @@ + + + + + + +CD_DBUFFER + + + + + +

CD_DBUFFER - Double Buffer Driver using a server image (cddbuf.h)

+ +

Implements the concept of offscreen drawing. It is based on a Server Image + (the back buffer) and a Window canvas (the front buffer).

+ +

Use

+ +

The canvas is created by means of a call to function + + cdCreateCanvas(CD_DBUFFER, + Data), after which other functions in the CD library can be called as + usual. This function creates a CD canvas to use with an existing window canvas + (Native Windows or IUP). The parameter Data is a + pointer to the already created canvas.

+

Any amount of such canvases may exist simultaneously. It is important to + note that a call to function + + cdKillCanvas is required to + properly end the driver. Call function + + cdKillCanvas for this driver + before calling cdKillCanvas for + the window driver.

+

The drawing functions will work normally as if they were drawn on + the server image driver. When function + + cdCanvasFlush is executed, the image is drawn in the window canvas + passed as parameter in the canvas creation.

+

When the window's size changes, the server image is automatically recreated + using the same size as the canvas. This is done in the function + + + cdCanvasActivate.

+

We suggest you to implement rubber bands using XOR directly on the front +buffer.

+

To use this driver in Windows using GDI+ is necessary to call + + cdUseContextPlus(1) +before creating the canvas.

+ +

Behavior of Functions

+ +

This driver is greatly platform-dependent. For further detail, see the + Behavior of Functions in each platform: Microsoft + Windows (GDI), Windows Using GDI+, + X-Windows (XLIB). However, it should be noted that + some functions behave differently from the basic functions of each platform.

+

Control

+ +

 

+ + + + + -- cgit v1.2.3