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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
2 W  R5 k5 y. B0 A4 jhttp://www.gamedev.net/community/forums/topic.asp?topic_id=359319
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# o  m) N0 |- M  ?: d+ E/ kA 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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The 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.% ]( V7 S4 G' e1 B( B- N3 x
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Back to the sample. The files of interest are:
, Y+ i( h+ v5 mOverlay.cpp: Window creation (auto-generated, nothing interesting) and the main loop (important).
# Q: L( D, ^3 [9 `. s2 z: r6 Uoverlay_renderer.h, overlay_renderer.cpp: The core of the sample. The code is fairly self-explanatory, though.
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8 r, D* x0 d: x5 _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:- r1 y4 E! y3 F# J
dwAlignBoundarySrc
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dwAlignBoundaryDest
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  \" N; C1 n9 A9 ^1 O; D) NdwAlignStrideAlign 7 o: L& y5 L  F  e2 a7 y" v
dwMinOverlayStretch + @8 I/ G+ ?2 ]% b
dwMaxOverlayStretch
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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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The limitations (and overlays in general) are documented under “DirectDraw->DirectDraw Essentials->Surfaces->Overlay Surfaces” in the DX7 documentation. It’s available at icarusIndie.. W8 T& _+ N& z5 S
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I might write a managed port, if someone’s interested. All feedback’s welcome.

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