本文整理汇总了C++中CPDF_Page::BackgroundAlphaNeeded方法的典型用法代码示例。如果您正苦于以下问题：C++ CPDF_Page::BackgroundAlphaNeeded方法的具体用法？C++ CPDF_Page::BackgroundAlphaNeeded怎么用？C++ CPDF_Page::BackgroundAlphaNeeded使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类CPDF_Page的用法示例。
在下文中一共展示了CPDF_Page::BackgroundAlphaNeeded方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1:
DLLEXPORT FPDF_BOOL STDCALL FPDFPage_HasTransparency(FPDF_PAGE page)
{
if(!page) return FALSE;
CPDF_Page* pPage = (CPDF_Page*)page;
return pPage->BackgroundAlphaNeeded();
}示例2: CPDFPageFromFPDFPage
DLLEXPORT FPDF_BOOL STDCALL FPDFPage_HasTransparency(FPDF_PAGE page) {
CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
return pPage && pPage->BackgroundAlphaNeeded();
}示例3: WinDC
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
{
//.........这里部分代码省略.........