bool RichEditHost::RenderTo(Graphics& graphics, const MiniRect& rcRender)
{
if (!m_pTextServices || !m_pEdit)
{
return false;
}
MiniRect rcRootRender = rcRender;
MiniRect rcRoot;
m_pEdit->GetClientRect(rcRoot);
rcRootRender += rcRoot.TopLeft();
Bitmap* pBitmap = graphics.GetBitmap();
byte* pBytes = (byte*)pBitmap->LockBits(rcRootRender);
for (int i = 0; i < rcRender.Height(); ++i)
{
MiniARGB* pSrc = (MiniARGB*)(pBytes + i * pBitmap->GetBytesWidth());
MiniARGB* pDst = (MiniARGB*)(m_dib.GetData() + (i + rcRender.top) * m_dib.GetBytesWidth()) + rcRender.left;
for (int j = 0; j < rcRender.Width(); ++j)
{
uint32 c = gTable[pSrc->alpha];
pDst->blue = (uint32)(c * (uint32)pSrc->blue + (1 << 23)) >> 24;
pDst->green = (uint32)(c * (uint32)pSrc->green + (1 << 23)) >> 24;
pDst->red = (uint32)(c * (uint32)pSrc->red + (1 << 23)) >> 24;
pDst->alpha = 0xFF;
pDst++;
pSrc++;
}
}
RECTL rc = {0, 0, m_size.cx, m_size.cy};
HRESULT hr = m_pTextServices->TxDraw(DVASPECT_CONTENT, 0, 0, 0, m_dib, 0, &rc, 0, 0, 0, 0, TXTVIEW_ACTIVE);
if (SUCCEEDED(hr))
{
if (m_bFocus && m_bShowCaret && m_bEnableCaret && m_bCaretState && !GetReadOnly())
{
if (!m_hCaret)
{
::PatBlt((HDC)m_dib, m_rcCaret.left, m_rcCaret.top, m_rcCaret.Width(), m_rcCaret.Height(), DSTINVERT);
}
else
{
HDC hdcMem = CreateCompatibleDC((HDC)m_dib);
HGDIOBJ hOld = ::SelectObject(hdcMem, m_hCaret);
::BitBlt((HDC)m_dib, m_rcCaret.left, m_rcCaret.top, m_rcCaret.Width(), m_rcCaret.Height(), hdcMem, 0, 0, SRCINVERT);
::SelectObject(hdcMem, hOld);
::DeleteDC(hdcMem);
}
}
for (int i = 0; i < rcRender.Height(); ++i)
{
MiniARGB* pSrc = (MiniARGB*)(m_dib.GetData() + (i + rcRender.top) * m_dib.GetBytesWidth()) + rcRender.left;
MiniARGB* pDst = (MiniARGB*)(pBytes + i * pBitmap->GetBytesWidth());
for (int j = 0; j < rcRender.Width(); ++j)
{
uint32 alpha = (uint32)pDst->alpha + 1;
pDst->blue = ((uint32)pSrc->blue * alpha) >> 8;
pDst->green = ((uint32)pSrc->green * alpha) >> 8;
pDst->red = ((uint32)pSrc->red * alpha) >> 8;
pDst++;
pSrc++;
}
}
}
return true;
}
