ID3DXSprite显示一副图像时会对图像放大，如何修改不放大也不缩小原图

[everything_at_once]

目前有一副png图像，分辨率为1440*900，显示的窗口也是1440*900
显示的时候，图像会被放大，造成显示不全
如何设置可以让1440*900的图像完整显示在1440*900的窗口上，既不放大，也不缩小。

[everything_at_once]

引用 3 楼 zhao4zhong1 的回复:

关于Windows高DPI的一些简单总结 http://www.cnblogs.com/weiym/p/3555068.html ?

查看了当前电脑的设置，是100%，感觉和这个无关，我这边论坛上传不了图片，我做了一副100*100的图像，显示在100*100的矩形里，实际差了很多。后来用下面的方式暂时解决了。

D3DXMATRIX mat;

// 1440*900 渲染
D3DXMatrixTransformation2D(&mat, NULL, 0.0f, &D3DXVECTOR2(0.703f, 0.877f), NULL, 0, &D3DXVECTOR2(0.0f, 0.0f));

// 2*1920*1080
D3DXMatrixTransformation2D(&mat, NULL, 0.0f, &D3DXVECTOR2(1.0f, 0.52f), NULL, 0, &D3DXVECTOR2(0.0f, 0.0f));

经测试，1440*900的图片在1440*900分辨率的显示器上渲染需要设置 D3DXVECTOR2(0.703f, 0.877f)， 3840*1080的图片在3840*1080的两个显示器上渲染需要设置 D3DXVECTOR2(1.0f, 0.52f)， 这样图像才能显示完整，只是渲染出来的效果略微发虚，但还可以接受，具体什么原因还不清楚，后面再验证。

[赵4老师]

像素纵横比 ？

[赵4老师]

AdjustWindowRect
The AdjustWindowRect function calculates the required size of the window rectangle, based on the desired client-rectangle size. The window rectangle can then be passed to the CreateWindow function to create a window whose client area is the desired size.

BOOL AdjustWindowRect(
LPRECT lpRect, // pointer to client-rectangle structure
DWORD dwStyle, // window styles
BOOL bMenu // menu-present flag
);

Parameters
lpRect
Pointer to aRECT structure that contains the coordinates of the top-left and bottom-right corners of the desired client area. When the function returns, the structure contains the coordinates of the top-left and bottom-right corners of the window to accommodate the desired client area.
dwStyle
Specifies the window styles of the window whose required size is to be calculated.
bMenu
Specifies whether the window has a menu.
Return Values
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, callGetLastError.

Remarks
A client rectangle is the smallest rectangle that completely encloses a client area. A window rectangle is the smallest rectangle that completely encloses the window, which includes the client area and the nonclient area.

The AdjustWindowRect function does not add extra space when a menu bar wraps to two or more rows.

QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Import Library: Use user32.lib.

See Also
Windows Overview, Window Functions, AdjustWindowRectEx, CreateWindow,RECT

[everything_at_once]

引用 1 楼 zhao4zhong1 的回复:

AdjustWindowRect The AdjustWindowRect function calculates the required size of the window rectangle, based on the desired client-rectangle size. The window rectangle can then be passed to the CreateWindow function to create a window whose client area is the desired size. BOOL AdjustWindowRect( LPRECT lpRect, // pointer to client-rectangle structure DWORD dwStyle, // window styles BOOL bMenu // menu-present flag ); Parameters lpRect Pointer to aRECT structure that contains the coordinates of the top-left and bottom-right corners of the desired client area. When the function returns, the structure contains the coordinates of the top-left and bottom-right corners of the window to accommodate the desired client area. dwStyle Specifies the window styles of the window whose required size is to be calculated. bMenu Specifies whether the window has a menu. Return Values If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, callGetLastError. Remarks A client rectangle is the smallest rectangle that completely encloses a client area. A window rectangle is the smallest rectangle that completely encloses the window, which includes the client area and the nonclient area. The AdjustWindowRect function does not add extra space when a menu bar wraps to two or more rows. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Unsupported. Header: Declared in winuser.h. Import Library: Use user32.lib. See Also Windows Overview, Window Functions, AdjustWindowRectEx, CreateWindow,RECT

经测试，输入1440*900，通过AdjustWindowRect返回矩形大小为4 23 1444 904，还是有放大情况，查过相关资料，应该和ID3DXSprite或加载Texture设置有关，这个正在试，目前这个放大不是一点，是很明显的放大，一副1440*900的图像显示在1440*900的显示器上后，缺失的右+下部分大约有五分之一

[赵4老师]

关于Windows高DPI的一些简单总结
http://www.cnblogs.com/weiym/p/3555068.html

?

[draculamx]

ID3DXSprite，你用的是D3D9吗？我原来没有出现过这种情况啊，把你Render的代码放出来看看啊，不看代码怎么查问题

[everything_at_once]

引用 6 楼 draculamx 的回复:

ID3DXSprite，你用的是D3D9吗？我原来没有出现过这种情况啊，把你Render的代码放出来看看啊，不看代码怎么查问题

    

            D3DXCreateTextureFromFile(m_dev, _T("logo.png"), &m_pLogoTexture);
			m_dev->SetTexture(0, m_pLogoTexture);
			D3DXCreateSprite(m_dev, &m_pLogoSprite);     
   
            RECT rct;
			::GetWindowRect(m_wnd,&rct);
			//SetRect( &rct, 0, 0, 100, 100 );

			m_dev->BeginScene();
			{
				m_pLogoSprite->Begin(D3DXSPRITE_ALPHABLEND);
				m_pLogoSprite->Draw(m_pLogoTexture, NULL, NULL, NULL, 0xffffffff);
				m_pLogoSprite->End();
			}
			m_dev->EndScene();

[WJN92]

太旧了，现在dx是可以调试的

[draculamx]

directx9的话，CreateTexture的时候，一般要求，图片的长，宽，为2的次幂，比如你搞个长度为135的图片的话，由于有的显卡不支持非2次幂的纹理，所以就有可能出现模糊。。。

长：512 宽：128，这种就是符合要求的，他们都是2的次幂