C++ (Cpp) CPDF_Page::BackgroundAlphaNeeded Examples

Example #1

File: fpdfeditpage.cpp Project: azunite/pdfium_ch

DLLEXPORT FPDF_BOOL STDCALL FPDFPage_HasTransparency(FPDF_PAGE page)
{
	if(!page) return FALSE;
	CPDF_Page* pPage = (CPDF_Page*)page;

	return pPage->BackgroundAlphaNeeded();
}

Example #2

DLLEXPORT FPDF_BOOL STDCALL FPDFPage_HasTransparency(FPDF_PAGE page) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  return pPage && pPage->BackgroundAlphaNeeded();
}

Example #3

DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc, FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y,
                                       int rotate, int flags)
{
    if (page==NULL) return;
    CPDF_Page* pPage = (CPDF_Page*)page;

    CRenderContext* pContext = FX_NEW CRenderContext;
    pPage->SetPrivateData((void*)1, pContext, DropContext);

#ifndef _WIN32_WCE
    CFX_DIBitmap* pBitmap = NULL;
    FX_BOOL bBackgroundAlphaNeeded=FALSE;
    bBackgroundAlphaNeeded = pPage->BackgroundAlphaNeeded();
    if (bBackgroundAlphaNeeded)
    {

        pBitmap = FX_NEW CFX_DIBitmap;
        pBitmap->Create(size_x, size_y, FXDIB_Argb);
        pBitmap->Clear(0x00ffffff);
#ifdef _SKIA_SUPPORT_
        pContext->m_pDevice = FX_NEW CFX_SkiaDevice;
        ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
#else
        pContext->m_pDevice = FX_NEW CFX_FxgeDevice;
        ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
#endif
    }
    else
        pContext->m_pDevice = FX_NEW CFX_WindowsDevice(dc);
    if (flags & FPDF_NO_CATCH)
        Func_RenderPage(pContext, page, start_x, start_y, size_x, size_y, rotate, flags,TRUE,NULL);
    else {
        try {
            Func_RenderPage(pContext, page, start_x, start_y, size_x, size_y, rotate, flags,TRUE,NULL);
        } catch (...) {
        }
    }
    if (bBackgroundAlphaNeeded)
    {
        if (pBitmap)
        {
            CFX_WindowsDevice WinDC(dc);

            if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER)
            {
                CFX_DIBitmap* pDst = FX_NEW CFX_DIBitmap;
                pDst->Create(pBitmap->GetWidth(), pBitmap->GetHeight(),FXDIB_Rgb32);
                FXSYS_memcpy(pDst->GetBuffer(), pBitmap->GetBuffer(), pBitmap->GetPitch()*pBitmap->GetHeight());
//				WinDC.SetDIBits(pDst,0,0);
                WinDC.StretchDIBits(pDst,0,0,size_x*2,size_y*2);
                delete pDst;
            }
            else
                WinDC.SetDIBits(pBitmap,0,0);

        }
    }
#else
    // get clip region
    RECT rect, cliprect;
    rect.left = start_x;
    rect.top = start_y;
    rect.right = start_x + size_x;
    rect.bottom = start_y + size_y;
    GetClipBox(dc, &cliprect);
    IntersectRect(&rect, &rect, &cliprect);
    int width = rect.right - rect.left;
    int height = rect.bottom - rect.top;

#ifdef DEBUG_TRACE
    {
        char str[128];
        sprintf(str, "Rendering DIB %d x %d", width, height);
        CPDF_ModuleMgr::Get()->ReportError(999, str);
    }
#endif

    // Create a DIB section
    LPVOID pBuffer;
    BITMAPINFOHEADER bmih;
    FXSYS_memset(&bmih, 0, sizeof bmih);
    bmih.biSize = sizeof bmih;
    bmih.biBitCount = 24;
    bmih.biHeight = -height;
    bmih.biPlanes = 1;
    bmih.biWidth = width;
    pContext->m_hBitmap = CreateDIBSection(dc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS, &pBuffer, NULL, 0);
    if (pContext->m_hBitmap == NULL) {
#if defined(DEBUG) || defined(_DEBUG)
        char str[128];
        sprintf(str, "Error CreateDIBSection: %d x %d, error code = %d", width, height, GetLastError());
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, str);
#else
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, NULL);
#endif
    }
    FXSYS_memset(pBuffer, 0xff, height*((width*3+3)/4*4));

#ifdef DEBUG_TRACE
    {
        CPDF_ModuleMgr::Get()->ReportError(999, "DIBSection created");
    }
#endif

    // Create a device with this external buffer
    pContext->m_pBitmap = FX_NEW CFX_DIBitmap;
    pContext->m_pBitmap->Create(width, height, FXDIB_Rgb, (FX_LPBYTE)pBuffer);
    pContext->m_pDevice = FX_NEW CPDF_FxgeDevice;
    ((CPDF_FxgeDevice*)pContext->m_pDevice)->Attach(pContext->m_pBitmap);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Ready for PDF rendering");
#endif

    // output to bitmap device
    if (flags & FPDF_NO_CATCH)
        Func_RenderPage(pContext, page, start_x - rect.left, start_y - rect.top, size_x, size_y, rotate, flags);
    else {
        try {
            Func_RenderPage(pContext, page, start_x - rect.left, start_y - rect.top, size_x, size_y, rotate, flags);
        } catch (...) {
        }
    }

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Finished PDF rendering");
#endif

    // Now output to real device
    HDC hMemDC = CreateCompatibleDC(dc);
    if (hMemDC == NULL) {
#if defined(DEBUG) || defined(_DEBUG)
        char str[128];
        sprintf(str, "Error CreateCompatibleDC. Error code = %d", GetLastError());
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, str);
#else
        CPDF_ModuleMgr::Get()->ReportError(FPDFERR_OUT_OF_MEMORY, NULL);
#endif
    }

    HGDIOBJ hOldBitmap = SelectObject(hMemDC, pContext->m_hBitmap);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Ready for screen rendering");
#endif

    BitBlt(dc, rect.left, rect.top, width, height, hMemDC, 0, 0, SRCCOPY);
    SelectObject(hMemDC, hOldBitmap);
    DeleteDC(hMemDC);

#ifdef DEBUG_TRACE
    CPDF_ModuleMgr::Get()->ReportError(999, "Finished screen rendering");
#endif

#endif
    if (bBackgroundAlphaNeeded)
    {
        if (pBitmap)
            delete pBitmap;
        pBitmap = NULL;
    }
    delete pContext;
    pPage->RemovePrivateData((void*)1);
}