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【代理DLL汉化研究】 [C++] Overlay sample  覆盖代码实例

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【代理DLL汉化研究】 [C++] Overlay sample  覆盖代码实例

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发表于 2009-5-22 11:37 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

【代理DLL汉化研究】 [C++] Overlay sample  覆盖代码实例

用于在全屏游戏上画东西,写字。
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原文
% \0 _6 z$ S1 G9 V( H1 g9 Dhttp://www.gamedev.net/community/forums/topic.asp?topic_id=359319
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A lot of people seem interested in knowing how to render content over full-screen applications, like XFire and Co, judging by the number of posts about it. Here’s an unmanaged overlaying sample. Visual Studio 2003 and 2005 solutions are included.
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0 |% E. q* r* VThe sample uses DirectDraw overlays to render a black 256x64 box to the top-left of the screen, with some text in it. I would’ve shown you a screenshot, but I can’t, due to the way overlays work. Overlays are displayed as the device is painting the monitor from the primary surface. If it’s painting a location where an overlay exists, it paints the monitor with its color instead of the primary surface. Consequently, you can’t capture that in an image.
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7 R! v# y4 [2 {) _" L5 yBack to the sample. The files of interest are:0 G  @! f( {/ S: `6 p, q9 M
Overlay.cpp: Window creation (auto-generated, nothing interesting) and the main loop (important).* P( {' w+ H3 c9 S3 M' |
overlay_renderer.h, overlay_renderer.cpp: The core of the sample. The code is fairly self-explanatory, though.
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One important thing to keep in mind is that overlay support comes with a set of limitations. The following limitations are not checked or accounted for in the sample:6 p6 a9 a$ E9 R6 N6 i5 F
dwAlignBoundarySrc
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dwAlignBoundaryDest
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The limitations are hardware-dependent. For example, my X300 doesn’t impose any alignment restrictions for the source or destination overlay rectangles. In a product, however, you’d want to make sure you check for these and abide by them. Use CapsViewer to find out the limitations of your hardware quickly. I don’t know if the October SDK caps database includes DirectDraw caps or not, but consider checking it out.
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- {1 W3 n+ E$ L3 b! D# J& vThe limitations (and overlays in general) are documented under “DirectDraw->DirectDraw Essentials->Surfaces->Overlay Surfaces” in the DX7 documentation. It’s available at icarusIndie.* x( _9 z5 y4 c7 m
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I might write a managed port, if someone’s interested. All feedback’s welcome.

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