wxWidgets/include/wx/dcsvg.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/dcsvg.h
// Purpose:     wxSVGFileDC
// Author:      Chris Elliott
// Modified by:
// Created:
// Copyright:   (c) Chris Elliott
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_DCSVG_H_
#define _WX_DCSVG_H_

#include "wx/string.h"
#include "wx/dc.h"

#if wxUSE_SVG

#include "wx/scopedptr.h"

#define wxSVGVersion wxT("v0101")

class WXDLLIMPEXP_FWD_BASE wxFileOutputStream;

class WXDLLIMPEXP_FWD_CORE wxSVGFileDC;

// Base class for bitmap handlers used by wxSVGFileDC, used by the standard
// "embed" and "link" handlers below but can also be used to create a custom
// handler.
class WXDLLIMPEXP_CORE wxSVGBitmapHandler
{
public:
    // Write the representation of the given bitmap, appearing at the specified
    // position, to the provided stream.
    virtual bool ProcessBitmap(const wxBitmap& bitmap,
                               wxCoord x, wxCoord y,
                               wxOutputStream& stream) const = 0;

    virtual ~wxSVGBitmapHandler() {}
};

// Predefined standard bitmap handler: creates a file, stores the bitmap in
// this file and uses the file name in the generated SVG.
class WXDLLIMPEXP_CORE wxSVGBitmapFileHandler : public wxSVGBitmapHandler
{
public:
    wxSVGBitmapFileHandler()
        : m_path()
    {
    }

    explicit wxSVGBitmapFileHandler(const wxString& path)
        : m_path(path)
    {
    }

    virtual bool ProcessBitmap(const wxBitmap& bitmap,
                               wxCoord x, wxCoord y,
                               wxOutputStream& stream) const wxOVERRIDE;

private:
    wxString m_path; // When set, will be appended with _image#.png
};

// Predefined handler which embeds the bitmap (base64-encoding it) inside the
// generated SVG file.
class WXDLLIMPEXP_CORE wxSVGBitmapEmbedHandler : public wxSVGBitmapHandler
{
public:
    virtual bool ProcessBitmap(const wxBitmap& bitmap,
                               wxCoord x, wxCoord y,
                               wxOutputStream& stream) const wxOVERRIDE;
};

class WXDLLIMPEXP_CORE wxSVGFileDCImpl : public wxDCImpl
{
public:
    wxSVGFileDCImpl(wxSVGFileDC *owner, const wxString &filename,
                    int width = 320, int height = 240, double dpi = 72.0,
                    const wxString &title = wxString());

    virtual ~wxSVGFileDCImpl();

    bool IsOk() const wxOVERRIDE { return m_OK; }

    virtual bool CanDrawBitmap() const wxOVERRIDE { return true; }
    virtual bool CanGetTextExtent() const wxOVERRIDE { return true; }

    virtual int GetDepth() const wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::GetDepth Call not implemented"));
        return -1;
    }

    virtual void Clear() wxOVERRIDE;

    virtual void DestroyClippingRegion() wxOVERRIDE;

    virtual wxCoord GetCharHeight() const wxOVERRIDE;
    virtual wxCoord GetCharWidth() const wxOVERRIDE;

#if wxUSE_PALETTE
    virtual void SetPalette(const wxPalette&  WXUNUSED(palette)) wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::SetPalette not implemented"));
    }
#endif

    virtual void SetLogicalFunction(wxRasterOperationMode WXUNUSED(function)) wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::SetLogicalFunction Call not implemented"));
    }

    virtual wxRasterOperationMode GetLogicalFunction() const wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::GetLogicalFunction() not implemented"));
        return wxCOPY;
    }

    virtual void SetLogicalOrigin(wxCoord x, wxCoord y) wxOVERRIDE
    {
        wxDCImpl::SetLogicalOrigin(x, y);
        m_graphics_changed = true;
    }

    virtual void SetDeviceOrigin(wxCoord x, wxCoord y) wxOVERRIDE
    {
        wxDCImpl::SetDeviceOrigin(x, y);
        m_graphics_changed = true;
    }

    virtual void SetAxisOrientation(bool xLeftRight, bool yBottomUp) wxOVERRIDE
    {
        wxDCImpl::SetAxisOrientation(xLeftRight, yBottomUp);
        m_graphics_changed = true;
    }

    virtual void SetBackground(const wxBrush &brush) wxOVERRIDE;
    virtual void SetBackgroundMode(int mode) wxOVERRIDE;
    virtual void SetBrush(const wxBrush& brush) wxOVERRIDE;
    virtual void SetFont(const wxFont& font) wxOVERRIDE;
    virtual void SetPen(const wxPen& pen) wxOVERRIDE;

    virtual void* GetHandle() const wxOVERRIDE { return NULL; }

    void SetBitmapHandler(wxSVGBitmapHandler* handler);

private:
    virtual bool DoGetPixel(wxCoord, wxCoord, wxColour *) const wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::DoGetPixel Call not implemented"));
        return true;
    }

    virtual bool DoBlit(wxCoord, wxCoord, wxCoord, wxCoord, wxDC *,
                        wxCoord, wxCoord, wxRasterOperationMode = wxCOPY,
                        bool = 0, int = -1, int = -1) wxOVERRIDE;

    virtual void DoCrossHair(wxCoord, wxCoord) wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::CrossHair Call not implemented"));
    }

    virtual void DoDrawArc(wxCoord, wxCoord, wxCoord, wxCoord, wxCoord, wxCoord) wxOVERRIDE;

    virtual void DoDrawBitmap(const wxBitmap &, wxCoord, wxCoord, bool = false) wxOVERRIDE;

    virtual void DoDrawCheckMark(wxCoord x, wxCoord y, wxCoord w, wxCoord h) wxOVERRIDE;

    virtual void DoDrawEllipse(wxCoord x, wxCoord y, wxCoord w, wxCoord h) wxOVERRIDE;

    virtual void DoDrawEllipticArc(wxCoord x, wxCoord y, wxCoord w, wxCoord h,
                                   double sa, double ea) wxOVERRIDE;

    virtual void DoDrawIcon(const wxIcon &, wxCoord, wxCoord) wxOVERRIDE;

    virtual void DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2) wxOVERRIDE;

    virtual void DoDrawLines(int n, const wxPoint points[],
                             wxCoord xoffset = 0, wxCoord yoffset = 0) wxOVERRIDE;

    virtual void DoDrawPoint(wxCoord, wxCoord) wxOVERRIDE;

    virtual void DoDrawPolygon(int n, const wxPoint points[],
                               wxCoord xoffset, wxCoord yoffset,
                               wxPolygonFillMode fillStyle) wxOVERRIDE;

    virtual void DoDrawPolyPolygon(int n, const int count[], const wxPoint points[],
                                   wxCoord xoffset, wxCoord yoffset,
                                   wxPolygonFillMode fillStyle) wxOVERRIDE;

    virtual void DoDrawRectangle(wxCoord x, wxCoord y, wxCoord w, wxCoord h) wxOVERRIDE;

    virtual void DoDrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
                                   double angle) wxOVERRIDE;

    virtual void DoDrawRoundedRectangle(wxCoord x, wxCoord y,
                                        wxCoord w, wxCoord h,
                                        double radius = 20) wxOVERRIDE;

    virtual void DoDrawText(const wxString& text, wxCoord x, wxCoord y) wxOVERRIDE;

    virtual bool DoFloodFill(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
                             const wxColour& WXUNUSED(col),
                             wxFloodFillStyle WXUNUSED(style) = wxFLOOD_SURFACE) wxOVERRIDE
    {
        wxFAIL_MSG(wxT("wxSVGFILEDC::DoFloodFill Call not implemented"));
        return false;
    }

    virtual void DoGetSize(int * x, int *y) const wxOVERRIDE
    {
        if ( x )
            *x = m_width;
        if ( y )
            *y = m_height;
    }

    virtual void DoGetTextExtent(const wxString& string, wxCoord *w, wxCoord *h,
                                 wxCoord *descent = NULL,
                                 wxCoord *externalLeading = NULL,
                                 const wxFont *font = NULL) const wxOVERRIDE;

    virtual void DoSetDeviceClippingRegion(const wxRegion& region) wxOVERRIDE
    {
        DoSetClippingRegion(region.GetBox().x, region.GetBox().y,
                            region.GetBox().width, region.GetBox().height);
    }

    virtual void DoSetClippingRegion(int x, int y, int width, int height) wxOVERRIDE;

    virtual void DoGetSizeMM(int *width, int *height) const wxOVERRIDE;

    virtual wxSize GetPPI() const wxOVERRIDE;

    void Init(const wxString &filename, int width, int height,
              double dpi, const wxString &title);

    void write(const wxString &s);

private:
    // If m_graphics_changed is true, close the current <g> element and start a
    // new one for the last pen/brush change.
    void NewGraphicsIfNeeded();

    // Open a new graphics group setting up all the attributes according to
    // their current values in wxDC.
    void DoStartNewGraphics();

    wxString            m_filename;
    bool                m_OK;
    bool                m_graphics_changed;  // set by Set{Brush,Pen}()
    int                 m_width, m_height;
    double              m_dpi;
    wxScopedPtr<wxFileOutputStream> m_outfile;
    wxScopedPtr<wxSVGBitmapHandler> m_bmp_handler; // class to handle bitmaps

    // The clipping nesting level is incremented by every call to
    // SetClippingRegion() and reset when DestroyClippingRegion() is called.
    size_t m_clipNestingLevel;

    // Unique ID for every clipping graphics group: this is simply always
    // incremented in each SetClippingRegion() call.
    size_t m_clipUniqueId;

    wxDECLARE_ABSTRACT_CLASS(wxSVGFileDCImpl);
};


class WXDLLIMPEXP_CORE wxSVGFileDC : public wxDC
{
public:
    wxSVGFileDC(const wxString& filename,
                int width = 320,
                int height = 240,
                double dpi = 72.0,
                const wxString& title = wxString())
        : wxDC(new wxSVGFileDCImpl(this, filename, width, height, dpi, title))
    {
    }

    // wxSVGFileDC-specific methods:

    // Use a custom bitmap handler: takes ownership of the handler.
    void SetBitmapHandler(wxSVGBitmapHandler* handler);
};

#endif // wxUSE_SVG

#endif // _WX_DCSVG_H_