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fixed scaling of print preview if there's not enough RAM for the full page

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@55135 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
2008-08-20 21:59:10 +00:00
parent b43a0635a2
commit 49ad7c5115
1 changed files with 17 additions and 9 deletions
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26
src/common/prntbase.cpp
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@@ -1856,9 +1856,12 @@ namespace
class PageFragmentDC : public wxMemoryDC
{
public:
PageFragmentDC(wxDC *printer, wxBitmap& bmp, const wxRect& rect)
PageFragmentDC(wxDC *printer, wxBitmap& bmp,
const wxPoint& offset,
const wxSize& fullSize)
: wxMemoryDC(printer),
m_rect(rect)
m_offset(offset),
m_fullSize(fullSize)
{
SetDeviceOrigin(0, 0);
SelectObject(bmp);
@@ -1866,26 +1869,27 @@ public:
virtual void SetDeviceOrigin(wxCoord x, wxCoord y)
{
wxMemoryDC::SetDeviceOrigin(x - m_rect.x, y - m_rect.y);
wxMemoryDC::SetDeviceOrigin(x - m_offset.x, y - m_offset.y);
}
virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const
{
wxMemoryDC::DoGetDeviceOrigin(x, y);
if ( x ) *x += m_rect.x;
if ( x ) *y += m_rect.y;
if ( x ) *x += m_offset.x;
if ( x ) *y += m_offset.y;
}
virtual void DoGetSize(int *width, int *height) const
{
if ( width )
*width = m_rect.width;
*width = m_fullSize.x;
if ( height )
*height = m_rect.height;
*height = m_fullSize.y;
}
private:
wxRect m_rect;
wxPoint m_offset;
wxSize m_fullSize;
};
// estimate how big chunks we can render, given available RAM
@@ -1947,6 +1951,7 @@ static bool RenderPageFragment(wxPrintPreviewBase *preview,
wxPrinterDC& printer,
wxMemoryDC& finalDC,
const wxRect& rect,
int pageHeight, int pageWidth,
int pageNum)
{
// compute 'rect' equivalent in the small final bitmap:
@@ -1967,7 +1972,9 @@ static bool RenderPageFragment(wxPrintPreviewBase *preview,
// render part of the page into it:
{
PageFragmentDC memoryDC(&printer, large, rect);
PageFragmentDC memoryDC(&printer, large,
rect.GetPosition(),
wxSize(pageWidth, pageHeight));
if ( !memoryDC.IsOk() )
return false;
@@ -2045,6 +2052,7 @@ static bool RenderPageIntoBitmapHQ(wxPrintPreviewBase *preview,
printerDC,
bmpDC,
todo,
pageWidth, pageHeight,
pageNum) )
{
if ( todo.height < 20 )