TGPicture.cxx

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// @(#)root/gui:$Id$
// Author: Fons Rademakers   01/01/98
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
/**************************************************************************
 
    This source is based on Xclass95, a Win95-looking GUI toolkit.
    Copyright (C) 1996, 1997 David Barth, Ricky Ralston, Hector Peraza.
 
    Xclass95 is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
**************************************************************************/
 
 
/** \class TGPicture
    \ingroup guiwidgets
 
 
The TGPicture class implements pictures and icons used in the
different GUI elements and widgets. The TGPicturePool class
implements a TGPicture cache. TGPictures are created, managed and
destroyed by the TGPicturePool.
 
*/
 
 
#include "TGPicture.h"
#include "TGResourcePool.h"
#include "THashTable.h"
#include "TSystem.h"
#include "TGWindow.h"
#include "TVirtualX.h"
#include "TImage.h"
#include "TROOT.h"
#include <cstdlib>
 
TGGC *TGSelectedPicture::fgSelectedGC = nullptr;
 
ClassImp(TGPicture);
ClassImp(TGSelectedPicture);
ClassImp(TGPicturePool);
 
 
////////////////////////////////////////////////////////////////////////////////
///copy constructor
 
TGPicturePool::TGPicturePool(const TGPicturePool& pp) :
  TObject(pp),
  fClient(pp.fClient),
  fPath(pp.fPath),
  fPicList(pp.fPicList)
{
}
 
////////////////////////////////////////////////////////////////////////////////
///assignment operator
 
TGPicturePool& TGPicturePool::operator=(const TGPicturePool& pp)
{
   if(this!=&pp) {
      TObject::operator=(pp);
      fClient=pp.fClient;
      fPath=pp.fPath;
      fPicList=pp.fPicList;
   }
   return *this;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Get a picture from the picture pool. Picture must be freed using
/// TGPicturePool::FreePicture(). If picture is not found 0 is returned.
/// \param name Name of the file containing the picture
 
const TGPicture *TGPicturePool::GetPicture(const char *name)
{
   if (!fPicList)
      fPicList = new THashTable(50);
 
   TString pname = name;
   pname.Strip();
   TString ext = strrchr(pname, '.');
   ext.ToLower();
 
   if (ext.Length()) { // ".xpm", ".gif" etc
      pname = gSystem->UnixPathName(pname);
      gSystem->ExpandPathName(pname);
   }
 
   TGPicture *pic = (TGPicture *)fPicList->FindObject(pname);
   if (pic && !pic->IsScaled()) {
      if (pic->fPic == kNone)
         return 0;
      pic->AddReference();
      return pic;
   }
 
   char *picnam = gSystem->Which(fPath, pname, kReadPermission);
   if (!picnam) {
      pic = new TGPicture(pname);
      pic->fAttributes.fColormap  = fClient->GetDefaultColormap();
      pic->fAttributes.fCloseness = 40000; // Allow for "similar" colors
      pic->fAttributes.fMask      = kPASize | kPAColormap | kPACloseness;
      fPicList->Add(pic);
      return 0;
   }
 
   TImage *img = TImage::Open(picnam);
   if (!img) {
      pic = new TGPicture(pname);
      pic->fAttributes.fColormap  = fClient->GetDefaultColormap();
      pic->fAttributes.fCloseness = 40000; // Allow for "similar" colors
      pic->fAttributes.fMask      = kPASize | kPAColormap | kPACloseness;
      fPicList->Add(pic);
      delete [] picnam;
      return 0;
   }
 
   pic = new TGPicture(pname, img->GetPixmap(), img->GetMask());
   delete [] picnam;
   delete img;
   fPicList->Add(pic);
   return pic;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Like TGPicturePool::GetPicture() but, instead of returning null when the 
/// picture is not found, it returns a valid empty picture.
 
const TGPicture *TGPicturePool::GetPictureOrEmpty(const char *name)
{
   static const TGPicture fEmptyPic { "Empty" };
   const TGPicture *pic = GetPicture(name);
   if (!pic)
      pic = &fEmptyPic;
   return pic;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Get picture with specified size from pool (picture will be scaled if
/// necessary). Picture must be freed using TGPicturePool::FreePicture(). If
/// picture is not found 0 is returned.
 
const TGPicture *TGPicturePool::GetPicture(const char *name,
                                           UInt_t new_width, UInt_t new_height)
{
   if (!fPicList)
      fPicList = new THashTable(50);
 
   TString pname = name;
   pname.Strip();
   TString ext = strrchr(pname, '.');
   ext.ToLower();
 
   if (ext.Length()) { // ".xpm", ".gif" etc
      pname = gSystem->UnixPathName(pname);
      gSystem->ExpandPathName(pname);
   }
 
   const char *hname = TGPicture::HashName(pname, new_width, new_height);
   TGPicture *pic = (TGPicture *)fPicList->FindObject(hname);
   if (pic && pic->GetWidth() == new_width && pic->GetHeight() == new_height) {
      if (pic->fPic == kNone)
         return 0;
      pic->AddReference();
      return pic;
   }
 
   char *picnam = gSystem->Which(fPath, pname, kReadPermission);
   if (!picnam) {
      pic = new TGPicture(hname, kTRUE);
      pic->fAttributes.fColormap  = fClient->GetDefaultColormap();
      pic->fAttributes.fCloseness = 40000; // Allow for "similar" colors
      pic->fAttributes.fMask      = kPASize | kPAColormap | kPACloseness;
      pic->fAttributes.fWidth  = new_width;
      pic->fAttributes.fHeight = new_height;
      fPicList->Add(pic);
      return 0;
   }
 
   TImage *img = TImage::Open(picnam);
   if (!img) {
      pic = new TGPicture(hname, kTRUE);
      pic->fAttributes.fColormap  = fClient->GetDefaultColormap();
      pic->fAttributes.fCloseness = 40000; // Allow for "similar" colors
      pic->fAttributes.fMask      = kPASize | kPAColormap | kPACloseness;
      pic->fAttributes.fWidth  = new_width;
      pic->fAttributes.fHeight = new_height;
      fPicList->Add(pic);
      delete [] picnam;
      return 0;
   }
 
   img->Scale(new_width, new_height);
 
   pic = new TGPicture(hname, img->GetPixmap(), img->GetMask());
   delete [] picnam;
   delete img;
   fPicList->Add(pic);
   return pic;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Get picture with specified pixmap and mask from pool.
/// Picture must be freed using TGPicturePool::FreePicture().
/// If picture is not found 0 is returned.
 
const TGPicture *TGPicturePool::GetPicture(const char *name, Pixmap_t pxmap,
                                           Pixmap_t mask)
{
   if (!fPicList)
      fPicList = new THashTable(50);
 
   Int_t xy;
   UInt_t w, h;
 
   gVirtualX->GetWindowSize(pxmap, xy, xy, w, h);
 
   const char *hname = TGPicture::HashName(name, w, h);
   TGPicture *pic = (TGPicture *)fPicList->FindObject(hname);
 
   if (pic) {
      pic->AddReference();
      return pic;
   }
 
   pic = new TGPicture(hname, pxmap, mask);
   fPicList->Add(pic);
 
   return pic;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create picture from XPM data.
/// Picture must be freed using TGPicturePool::FreePicture().
/// If picture creation failed 0 is returned.
 
const TGPicture *TGPicturePool::GetPicture(const char *name, char **xpm)
{
   UInt_t w, h;
 
   if (!xpm || !*xpm) {
      return 0;
   }
 
   if (!fPicList) {
      fPicList = new THashTable(50);
   }
   char *ptr = xpm[0];
   while (isspace((int)*ptr)) ++ptr;
   w = atoi(ptr);
 
   while (isspace((int)*ptr)) ++ptr;
   h = atoi(ptr);
 
   const char *hname = TGPicture::HashName(name, w, h);
   TGPicture *pic = (TGPicture *)fPicList->FindObject(hname);
   if (pic) {
      pic->AddReference();
      return pic;
   }
 
   TImage *img = TImage::Open(xpm);
   if (!img) {
      pic = new TGPicture(hname, kTRUE);
      pic->fAttributes.fColormap  = fClient->GetDefaultColormap();
      pic->fAttributes.fCloseness = 40000; // Allow for "similar" colors
      pic->fAttributes.fMask      = kPASize | kPAColormap | kPACloseness;
      pic->fAttributes.fWidth  = w;
      pic->fAttributes.fHeight = h;
      fPicList->Add(pic);
      return 0;
   }
 
   pic = new TGPicture(hname, img->GetPixmap(), img->GetMask());
   delete img;
   return pic;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Remove picture from cache if nobody is using it anymore.
 
void TGPicturePool::FreePicture(const TGPicture *fpic)
{
   if (!fPicList) return;
 
   TGPicture *pic = (TGPicture *)fPicList->FindObject(fpic);
   if (pic) {
      if (pic->RemoveReference() == 0) {
         fPicList->Remove(pic);
         delete pic;
      }
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete picture cache.
 
TGPicturePool::~TGPicturePool()
{
   if (fPicList) {
      fPicList->Delete();
      delete fPicList;
   }
 
   // Required since we overload TObject::Hash.
   ROOT::CallRecursiveRemoveIfNeeded(*this);
}
 
////////////////////////////////////////////////////////////////////////////////
/// List all pictures in the pool.
 
void TGPicturePool::Print(Option_t *) const
{
   if (fPicList)
      fPicList->Print();
   else
      Info("Print", "no pictures in picture pool");
}
 
////////////////////////////////////////////////////////////////////////////////
/// ctor. Important: both pixmaps pxmap and mask must be unique (not shared)
 
TGPicture::TGPicture(const char *name, Pixmap_t pxmap, Pixmap_t mask)
{
   fName   = name;
   fScaled = kFALSE;
   fPic    = pxmap;
   fMask   = mask;
   Int_t xy;
 
   fAttributes.fColormap  = gClient->GetDefaultColormap();
   fAttributes.fCloseness = 40000; // Allow for "similar" colors
   fAttributes.fMask      = kPASize | kPAColormap | kPACloseness;
   fAttributes.fPixels    = 0;
   fAttributes.fDepth     = 0;
   fAttributes.fNpixels   = 0;
   fAttributes.fXHotspot  = 0;
   fAttributes.fYHotspot  = 0;
 
   gVirtualX->GetWindowSize(fPic, xy, xy, fAttributes.fWidth, fAttributes.fHeight);
   SetRefCount(1);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw a picture.
 
void TGPicture::Draw(Handle_t id, GContext_t gc, Int_t x, Int_t y) const
{
   GCValues_t gcv;
 
   gcv.fMask = kGCClipMask | kGCClipXOrigin | kGCClipYOrigin;
   gcv.fClipMask = fMask;
   gcv.fClipXOrigin = x;
   gcv.fClipYOrigin = y;
   gVirtualX->ChangeGC(gc, &gcv);
   gVirtualX->CopyArea(fPic, id, gc, 0, 0, fAttributes.fWidth, fAttributes.fHeight,
                  x, y);
   gcv.fMask = kGCClipMask;
   gcv.fClipMask = kNone;
   gVirtualX->ChangeGC(gc, &gcv);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete picture object.
 
TGPicture::~TGPicture()
{
   if (fPic != kNone)
      gVirtualX->DeletePixmap(fPic);
   if (fMask != kNone)
      gVirtualX->DeletePixmap(fMask);
   if (fAttributes.fPixels)
      delete [] fAttributes.fPixels;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Static function returning a unique name used to look up a picture.
/// The unique name has the form "name__widthxheight".
 
const char *TGPicture::HashName(const char *name, Int_t width, Int_t height)
{
   static TString hashName;
 
   hashName.Form("%s__%dx%d", name, width, height);
   return hashName.Data();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Print picture info.
 
void TGPicture::Print(Option_t *) const
{
   Printf("TGPicture: %s,%sref cnt = %u %lx", GetName(),
          fScaled ? " scaled, " : " ", References(), fPic);
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Create a "selected" looking picture based on the original TGPicture.
 
TGSelectedPicture::TGSelectedPicture(const TGClient *client, const TGPicture *p) :
   TGPicture("")
{
   GCValues_t gcv;
   UInt_t     w, h;
 
   fClient = client;
   Window_t root  = fClient->GetDefaultRoot()->GetId();
 
   w = p->GetWidth();
   h = p->GetHeight();
 
   fPic  = gVirtualX->CreatePixmap(root, w, h);
   fMask = p->GetMask();
 
   fAttributes.fWidth  = w;
   fAttributes.fHeight = h;
 
   gVirtualX->CopyArea(p->GetPicture(), fPic, GetSelectedGC()(), 0, 0, w, h, 0, 0);
 
   gcv.fMask = kGCClipMask | kGCClipXOrigin | kGCClipYOrigin;
   gcv.fClipMask = p->GetMask();
   gcv.fClipXOrigin = 0;
   gcv.fClipYOrigin = 0;
   GetSelectedGC().SetAttributes(&gcv);
 
   gVirtualX->FillRectangle(fPic, GetSelectedGC()(), 0, 0, w, h);
 
   GetSelectedGC().SetClipMask(kNone);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete selected picture.
 
TGSelectedPicture::~TGSelectedPicture()
{
   // fMask was borrowed so should not be deleted by ~TGPicture.
   fMask = kNone;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return selection graphics context in use.
 
TGGC &TGSelectedPicture::GetSelectedGC()
{
   if (!fgSelectedGC) {
      fgSelectedGC = new TGGC(*gClient->GetResourcePool()->GetFrameGC());
      fgSelectedGC->SetForeground(gClient->GetResourcePool()->GetSelectedBgndColor());
      fgSelectedGC->SetBackground(gClient->GetResourcePool()->GetBlackColor());
      fgSelectedGC->SetFillStyle(kFillStippled);
      fgSelectedGC->SetStipple(gClient->GetResourcePool()->GetCheckeredBitmap());
   }
   return *fgSelectedGC;
}