Question

我正在尝试在MFC中的CView中渲染大图像（10K x 10K）。 GdiPlus的性能非常慢（准确地说是0.5 fps）。有没有我可以用于此目的的免费或商业图书馆？

DirectX渲染代码

float halfWidth = m_CurWidth/2.0;
float halfHeight = m_CurHeight/2.0;

D3DXMATRIX P;
D3DXMatrixOrthoLH(&P, (float)rect.Width(), (float)rect.Height(), -10, 10);
m_pDevice3D->SetTransform(D3DTS_PROJECTION, &P);

float cornerX = m_Left;
float cornerY = -m_Top;

VERTEX g_vVertices[4];
{
    g_vVertices[0] = VERTEX(cornerX + (-1.0f * halfWidth), cornerY + (1.0f * halfHeight), 0.0f, 0.0f, 0.0f );
    g_vVertices[1] = VERTEX(cornerX + (1.0f * halfWidth), cornerY + (1.0f * halfHeight), 0.0f, 1.0f, 0.0f );
    g_vVertices[2] = VERTEX(cornerX + (-1.0f * halfWidth), cornerY + (-1.0f * halfHeight), 0.0f, 0.0f, 1.0f );
    g_vVertices[3] = VERTEX(cornerX + (1.0f * halfWidth), cornerY + (-1.0f * halfHeight), 0.0f, 1.0f, 1.0f );
};

 void * pVertices;
 m_pVB->Lock( 0, sizeof(pVertices), (void**)&pVertices, 0 );
 memcpy( pVertices, g_vVertices, sizeof(g_vVertices));
 m_pVB->Unlock();

if(m_pDevice3D){
    m_pDevice3D->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
        0xffffffff, 1.0f, 0);
    m_pDevice3D->BeginScene();
    m_pDevice3D->SetFVF(D3DFVF_VERTEX);
    m_pDevice3D->SetStreamSource(0, m_pVB, 0, sizeof(VERTEX));
    // Draw primitives using presently enabled texture.
    m_pDevice3D->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
    m_pDevice3D->EndScene();
    m_pDevice3D->Present(0, 0, 0, 0);
}

在MFC中渲染大图像

0 个答案: