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From: | Filip Navara |
Subject: | Re: [Qemu-devel] QEMU Video Driver for Win NT-based systems |
Date: | Thu, 13 May 2004 01:04:48 +0200 |
User-agent: | Mozilla Thunderbird 0.6 (Windows/20040502) |
Grzegorz Kulewski wrote:
On Wed, 12 May 2004, Filip Navara wrote:Natalia Portillo wrote:This is not correct. At the driver level GDI calls and DirectDraw calls are completly separate interfaces implemented different way.DirectDraw is the accelerator for GDI.You are unfortunatelly right. GDI was introduced a lot ealier than DirectX (I think before win95).
Right, it was there since Windows 1.0.
But GDI can be not accelerated by graphic card but by qemu (using sdl or something like that) because today apps are using GDI mainly for user interface and not for advanced drawing I think. Right?Right, GDI is used mainly for UI drawing. It can be accelerated a bit. These GDI things can be *theoretically* optimized on the driver/HW level: Alpha Blending, Gradient Fills, BitBlts/StretchBlts/TransparentBlts, Paths/Lines and HW Cursor. This is kind of what VMware does, their drivers pass some of the requests throught I/O ports (partially documented) to the emulator which executes the most common operations in the non-emulated host environment.
- Filip
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