D2D1_MATRIX_3X2_F CanvasD2D::GetCurrentTransform()
{
D2D1_MATRIX_3X2_F d2dMatrix;
Gdiplus::Matrix gdipMatrix;
m_GdipGraphics->GetTransform(&gdipMatrix);
gdipMatrix.GetElements((Gdiplus::REAL*)&d2dMatrix);
return d2dMatrix;
}
void CanvasD2D::UpdateTargetTransform()
{
Gdiplus::Matrix gdipMatrix;
m_GdipGraphics->GetTransform(&gdipMatrix);
D2D1_MATRIX_3X2_F d2dMatrix;
gdipMatrix.GetElements((Gdiplus::REAL*)&d2dMatrix);
m_Target->SetTransform(d2dMatrix);
m_CanUseAxisAlignClip =
d2dMatrix._12 == 0.0f && d2dMatrix._21 == 0.0f &&
d2dMatrix._31 == 0.0f && d2dMatrix._32 == 0.0f;
}
HDC CanvasGdiplus::BeginPlatformPaint()
{
DCHECK(mem_graphics_.get());
Gdiplus::Matrix matrix;
mem_graphics_->GetTransform(&matrix);
Gdiplus::REAL elem[6];
matrix.GetElements(elem);
Gdiplus::Region region;
mem_graphics_->GetClip(®ion);
HRGN hrgn = region.GetHRGN(mem_graphics_.get());
HDC hdc = mem_graphics_->GetHDC();
InitializeDC(hdc);
XFORM xf = { elem[0], elem[1], elem[2], elem[3], elem[4], elem[5] };
SetWorldTransform(hdc, &xf);
SelectClipRgn(hdc, hrgn);
DeleteObject(hrgn);
return hdc;
}