/* * Copyright (C) 2011 Kevin Ollivier <kevino@theolliviers.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef LocalDC_h #define LocalDC_h #include "IntRect.h" #include <wtf/Assertions.h> #include <wx/defs.h> #include <wx/bitmap.h> #include <wx/dc.h> #include <wx/dcmemory.h> #include <wx/rawbmp.h> namespace WebCore { class LocalDC { public: LocalDC(wxDC* host, const IntRect& r, bool transparent = false) { #ifndef __WXMAC__ m_host = host; int width = r.width(); int height = r.height(); // on MSW, some controls like scrollbars do not always draw properly when // the bitmap is transparent. However, they draw into all pixels so this is // not needed. So only make the bitmap transparent when needed. int depth = 24; if (transparent) depth = 32; m_bitmap = new wxBitmap(width, height, depth); // we need the wxAlphaPixelData code to be in its own scope so that the // pixData is deleted before we assign the bitmap to the wxMemoryDC, // in order to avoid a copy. if (transparent) { wxAlphaPixelData pixData(*m_bitmap, wxPoint(0,0), wxSize(width, height)); ASSERT(pixData); if (pixData) { wxAlphaPixelData::Iterator p(pixData); for (int y=0; y<height; y++) { wxAlphaPixelData::Iterator rowStart = p; for (int x=0; x<width; x++) { p.Alpha() = 0; ++p; } p = rowStart; p.OffsetY(pixData, 1); } } } m_context = new wxMemoryDC(*m_bitmap); m_context->SetDeviceOrigin(-r.x(), -r.y()); m_rect = r; #else m_context = host; #endif } wxDC* context() { return m_context; } ~LocalDC() { #ifndef __WXMAC__ delete m_context; m_host->DrawBitmap(*m_bitmap, m_rect.x(), m_rect.y()); delete m_bitmap; #endif } private: wxDC* m_host; wxDC* m_context; wxBitmap* m_bitmap; IntRect m_rect; }; } #endif // LocalDC_h