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diff --git a/canvas/overview.txt b/canvas/overview.txt new file mode 100644 index 000000000000..5d508b04bc45 --- /dev/null +++ b/canvas/overview.txt @@ -0,0 +1,50 @@ +The new OOo Canvas Framework +============================ + +The new OpenOffice.org canvas framework is the successor of the system +GUI and graphics backend VCL. Basic functionality is available, +supplying just as much features as necessary to provide a +VCL-equivalent feature set (except proper BiDi/CTL support). + +For migration purposes, the new canvas and VCL will be shipped with +OpenOffice.org for quite some time, allowing a step-by-step adaptation +of the applications. Therefore, the canvas and VCL must somehow +interoperate, since new code, using the canvas, typically is embedded +in a VCL-based environment (for example, the OOo windows are still +provided by VCL. To render into such a window via the canvas, a canvas +must be constructable from a VCL window). Thus, essentially two new +methods are provided at VCL's window, namely Window::GetCanvas() and +Window::GetFullScreenCanvas(). Apart from that small link, canvas and +VCL are completely separated. + +The canvas framework currently consists of the following two new +CVS modules, /gsl/canvas and /gsl/cppcanvas. Additionally, a new +generic graphics tooling is used (but not exclusively by the canvas, +Armin's recent drawing layer fixups also make use of it), which +resides in /graphics/basegfx. From these modules, six libraries are +currently delivered, namely vclcanvas.uno.dll, javacanvas.jar, +directxcanvas.uno.dll, canvastools680mi.dll, cppcanvas680mi.dll, and +basegfx680mi.dll. + + +The new OOo slideshow engine +============================ + +The new OpenOffice.org slideshow engine will replace the current +Impress-embedded presentation framework with a fully independent UNO +component, and it will be based on the new canvas. In its current +state, it is able to provide a basic set of functionality, enabling +the playback of simple presentations. It furthermore provides features +like double-buffering, hardware-accelerated alpha-blending (currently +not on all platforms) and anti-aliased rendering of all primitives. + +In a second step, this new slideshow engine will then be integrated +with Impress model enhancements and extended PowerPoint import/export +filters, to implement nearly all of PowerPoint's set of effects. + +The new slideshow engine is currently not accessible from the office +UI, but included in the installations sets. Thus, other developers can +start to use the new functionality, and base their own implementations +on top of that. For the records, the respective UNO implementation of +the slideshow resides in the slideshow.uno.dll library. + |