如何使用Direct2D从窗口获取像素 [英] How to get pixels from window using Direct2D

问题描述

我的问题是获取窗口中的像素.我找不到执行此操作的方法.我使用标准的Windows函数和Direct2D(不是DirectDraw). 我正在使用新窗口的标准初始化:

My problem is getting the pixels in a window. I can't find a way to do this. I using standard windows functions and Direct2D (not DirectDraw). I am using standard initialization of new window:

WNDCLASS wc;
wc.style = CS_OWNDC; 
wc.lpfnWndProc = WndProc; 
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = (HBRUSH)(6);   
wc.lpszMenuName = 0;
wc.lpszClassName = L"WINDOW"; RegisterClass(&wc); 
hWnd = CreateWindow(L"WINDOW", L"Game", WS_OVERLAPPEDWINDOW,100,100,1024,768,NULL,NULL,hInstance,NULL);

然后我创建一个D2D1factory对象并在窗口中绘制位图:

Then I create a D2D1factory object and draw the bitmap in the window:

HWND hWnd = NULL;
srand((unsigned int)time((time_t)NULL));

ID2D1Factory* factory = NULL;
ID2D1HwndRenderTarget* rt = NULL;
CoInitializeEx(NULL,COINIT_MULTITHREADED);
My_CreateWindow(&hWnd, hInstance);
My_CreateFactory(&hWnd, factory, rt);
D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,&factory);

factory->CreateHwndRenderTarget(RenderTargetProperties(), HwndRenderTargetProperties(hWnd,SizeU(800,600)), &rt);

// tons of code

rt->BeginDraw(); rt->DrawBitmap(background[0], RectF(0,0,800,600));
rt->DrawBitmap(GIFHorse[(int)iterator],
RectF(0+MyX-100,0+MyY-100,100+MyX,100+MyY));
rt->DrawBitmap(Star[(int)iterator], RectF(0 + starX, 0 + starY, 50 + starX, 50+starY)); rt->EndDraw();

我需要计算点击率(我正在尝试制作简单的游戏).这就是为什么我需要访问窗口中的所有像素的原因.

I need to calculate the hits (I am trying to make simple game). So that's why I need access to all pixels in window.

我正在考虑使用其他算法，但是它们很难实现，我想从更简单的方法入手.

I'm thinking about using other algorithms, but they're harder to make and I want to start with something easier.

我了解GetPixel()函数，但是我不明白应该为HDC使用什么功能.

I know about the GetPixel() function, but I cant understand what I should use for HDC.

推荐答案

没有简单易行的方法来获取D2D像素.

There is no simple and easy way to get to D2D pixels.

可以使用几何图形实现简单的碰撞检测.如果在ID2D1Geometry对象中具有对象的轮廓，则可以使用

A simple collision detection can be implemented using geometries. If you have outlines of your objects in ID2D1Geometry objects you can compare them using ID2D1Geometry::CompareWithGeometry.

如果您坚持使用像素，则可以通过

If you insist on the pixels, a way to access them is from the DC obtainable via IDXGISurface1::GetDC

在这种情况下，您需要使用DXGI表面渲染目标和交换链，而不是hwnd渲染目标.

In this case you need to use the DXGI surface render target and the swap chain instead of the hwnd render target.

逐步:

1. D3D11CreateDeviceAndSwapChain 为您提供交换链.
2. IDXGISwapChain::GetBuffer 为您提供DXGI表面.
3. ID2D1Factory::CreateDxgiSurfaceRenderTarget 为您提供渲染目标.
4. IDXGISurface1::GetDC 给您DC.阅读本页上的注释！

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