Remove all uses of the fl_gc global variable. Towards a clean driver model.

fl_gc remains usable by the application as a hook into the system.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11189 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

9 files changed, 187 insertions, 164 deletions

diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
index 3bc9fedbe..74cd6a69d 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
@@ -27,6 +27,17 @@ const char *Fl_GDI_Graphics_Driver::class_id = "Fl_GDI_Graphics_Driver";
 // FIXME: move to printer graphics driver
 const char *Fl_GDI_Printer_Graphics_Driver::class_id = "Fl_GDI_Printer_Graphics_Driver";
 
+/* Reference to the current device context
+ For back-compatibility only. The preferred procedure to get this reference is
+ Fl_Surface_Device::surface()->driver()->get_gc().
+ */
+HDC fl_gc = 0;
+
+void Fl_Graphics_Driver::global_gc()
+{
+  fl_gc = (HDC)get_gc();
+}
+
 /*
  * By linking this module, the following static method will instatiate the
  * MSWindows GDI Graphics driver as the main display driver.
@@ -87,7 +98,7 @@ char Fl_GDI_Graphics_Driver::can_do_alpha_blending() {
 }
 
 HDC fl_makeDC(HBITMAP bitmap) {
-  HDC new_gc = CreateCompatibleDC(fl_gc);
+  HDC new_gc = CreateCompatibleDC((HDC)fl_graphics_driver->get_gc());
   SetTextAlign(new_gc, TA_BASELINE|TA_LEFT);
   SetBkMode(new_gc, TRANSPARENT);
 #if USE_COLORMAP
@@ -98,26 +109,26 @@ HDC fl_makeDC(HBITMAP bitmap) {
 }
 
 void Fl_GDI_Graphics_Driver::copy_offscreen(int x,int y,int w,int h,HBITMAP bitmap,int srcx,int srcy) {
-  HDC new_gc = CreateCompatibleDC(fl_gc);
+  HDC new_gc = CreateCompatibleDC(gc);
   int save = SaveDC(new_gc);
   SelectObject(new_gc, bitmap);
-  BitBlt(fl_gc, x, y, w, h, new_gc, srcx, srcy, SRCCOPY);
+  BitBlt(gc, x, y, w, h, new_gc, srcx, srcy, SRCCOPY);
   RestoreDC(new_gc, save);
   DeleteDC(new_gc);
 }
 
 void Fl_GDI_Graphics_Driver::copy_offscreen_with_alpha(int x,int y,int w,int h,HBITMAP bitmap,int srcx,int srcy) {
-  HDC new_gc = CreateCompatibleDC(fl_gc);
+  HDC new_gc = CreateCompatibleDC(gc);
   int save = SaveDC(new_gc);
   SelectObject(new_gc, bitmap);
   BOOL alpha_ok = 0;
   // first try to alpha blend
   if ( can_do_alpha_blending() ) {
-    alpha_ok = fl_alpha_blend(fl_gc, x, y, w, h, new_gc, srcx, srcy, w, h, blendfunc);
+    alpha_ok = fl_alpha_blend(gc, x, y, w, h, new_gc, srcx, srcy, w, h, blendfunc);
   }
   // if that failed (it shouldn't), still copy the bitmap over, but now alpha is 1
   if (!alpha_ok) {
-    BitBlt(fl_gc, x, y, w, h, new_gc, srcx, srcy, SRCCOPY);
+    BitBlt(gc, x, y, w, h, new_gc, srcx, srcy, SRCCOPY);
   }
   RestoreDC(new_gc, save);
   DeleteDC(new_gc);
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver.h b/src/drivers/GDI/Fl_GDI_Graphics_Driver.h
index 2dbdbe430..722c7410a 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver.h
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver.h
@@ -35,6 +35,7 @@
  */
 class FL_EXPORT Fl_GDI_Graphics_Driver : public Fl_Graphics_Driver {
 protected:
+  HDC gc;
   int numcount;
   int counts[20];
 public:
@@ -42,6 +43,8 @@ public:
   const char *class_name() {return class_id;};
   virtual int has_feature(driver_feature mask) { return mask & NATIVE; }
   char can_do_alpha_blending();
+  virtual void set_gc(void *ctxt) {gc = (HDC)ctxt;}
+  virtual void *get_gc() {return gc;}
 
   // --- bitmap stuff
   Fl_Bitmask create_bitmask(int w, int h, const uchar *array);
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_arci.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_arci.cxx
index 976c6f5c3..de8729d74 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_arci.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_arci.cxx
@@ -41,9 +41,9 @@ void Fl_GDI_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
   int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
   int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
   if (fabs(a1 - a2) < 90) {
-    if (xa == xb && ya == yb) SetPixel(fl_gc, xa, ya, fl_RGB());
-    else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
-  } else Arc(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
+    if (xa == xb && ya == yb) SetPixel(gc, xa, ya, fl_RGB());
+    else Arc(gc, x, y, x+w, y+h, xa, ya, xb, yb);
+  } else Arc(gc, x, y, x+w, y+h, xa, ya, xb, yb);
 }
 
 void Fl_GDI_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
@@ -53,14 +53,14 @@ void Fl_GDI_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
   int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
   int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
   int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
-  SelectObject(fl_gc, fl_brush());
+  SelectObject(gc, fl_brush());
   if (fabs(a1 - a2) < 90) {
     if (xa == xb && ya == yb) {
-      MoveToEx(fl_gc, x+w/2, y+h/2, 0L); 
-      LineTo(fl_gc, xa, ya);
-      SetPixel(fl_gc, xa, ya, fl_RGB());
-    } else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb);
-  } else Pie(fl_gc, x, y, x+w, y+h, xa, ya, xb, yb); 
+      MoveToEx(gc, x+w/2, y+h/2, 0L); 
+      LineTo(gc, xa, ya);
+      SetPixel(gc, xa, ya, fl_RGB());
+    } else Pie(gc, x, y, x+w, y+h, xa, ya, xb, yb);
+  } else Pie(gc, x, y, x+w, y+h, xa, ya, xb, yb); 
 }
 
 #endif // FL_CFG_GFX_GDI_ARCI_CXX
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_color.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_color.cxx
index ab7bf9332..8216d14ca 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_color.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_color.cxx
@@ -53,11 +53,11 @@ void fl_cleanup_pens(void) {
 
 void fl_save_pen(void) {
     if(!tmppen) tmppen = CreatePen(PS_SOLID, 1, 0);
-    savepen = (HPEN)SelectObject(fl_gc, tmppen);
+  savepen = (HPEN)SelectObject((HDC)fl_graphics_driver->get_gc(), tmppen);
 }
 
 void fl_restore_pen(void) {
-    if (savepen) SelectObject(fl_gc, savepen);
+  if (savepen) SelectObject((HDC)fl_graphics_driver->get_gc(), savepen);
     DeleteObject(tmppen);
     tmppen = 0;
     savepen = 0;
@@ -65,9 +65,10 @@ void fl_restore_pen(void) {
 
 static void clear_xmap(Fl_XMap& xmap) {
   if (xmap.pen) {
+    HDC gc = (HDC)fl_graphics_driver->get_gc();
     HGDIOBJ tmppen = GetStockObject(BLACK_PEN);
-    HGDIOBJ oldpen = SelectObject(fl_gc, tmppen);       // Push out the current pen of the gc
-    if(oldpen != xmap.pen) SelectObject(fl_gc, oldpen); // Put it back if it is not the one we are about to delete
+    HGDIOBJ oldpen = SelectObject(gc, tmppen);       // Push out the current pen of the gc
+    if(oldpen != xmap.pen) SelectObject(gc, oldpen); // Put it back if it is not the one we are about to delete
     DeleteObject((HGDIOBJ)(xmap.pen));
     xmap.pen = 0;
     xmap.brush = -1;
@@ -77,8 +78,9 @@ static void clear_xmap(Fl_XMap& xmap) {
 static void set_xmap(Fl_XMap& xmap, COLORREF c) {
   xmap.rgb = c;
   if (xmap.pen) {
-      HGDIOBJ oldpen = SelectObject(fl_gc,GetStockObject(BLACK_PEN)); // replace current pen with safe one
-      if (oldpen != xmap.pen)SelectObject(fl_gc,oldpen);              // if old one not xmap.pen, need to put it back
+      HDC gc = (HDC)fl_graphics_driver->get_gc();
+      HGDIOBJ oldpen = SelectObject(gc,GetStockObject(BLACK_PEN)); // replace current pen with safe one
+      if (oldpen != xmap.pen)SelectObject(gc,oldpen);              // if old one not xmap.pen, need to put it back
       DeleteObject(xmap.pen);                                         // delete pen
   }
   xmap.pen = CreatePen(PS_SOLID, 1, xmap.rgb);                        // get a pen into xmap.pen
@@ -105,7 +107,7 @@ void Fl_GDI_Graphics_Driver::color(Fl_Color i) {
 #endif
     }
     fl_current_xmap = &xmap;
-    SelectObject(fl_gc, (HGDIOBJ)(xmap.pen));
+    SelectObject(gc, (HGDIOBJ)(xmap.pen));
   }
 }
 
@@ -118,7 +120,7 @@ void Fl_GDI_Graphics_Driver::color(uchar r, uchar g, uchar b) {
     set_xmap(xmap, c);
   }
   fl_current_xmap = &xmap;
-  SelectObject(fl_gc, (HGDIOBJ)(xmap.pen));
+  SelectObject(gc, (HGDIOBJ)(xmap.pen));
 }
 
 HBRUSH fl_brush() {
@@ -127,6 +129,7 @@ HBRUSH fl_brush() {
 
 HBRUSH fl_brush_action(int action) {
   Fl_XMap *xmap = fl_current_xmap;
+  HDC gc = (HDC)fl_graphics_driver->get_gc();
   // Wonko: we use some statistics to cache only a limited number
   // of brushes:
 #define FL_N_BRUSH 16
@@ -137,7 +140,7 @@ HBRUSH fl_brush_action(int action) {
   } brushes[FL_N_BRUSH];
 
   if (action) {
-    SelectObject(fl_gc, GetStockObject(BLACK_BRUSH));  // Load stock object
+    SelectObject(gc, GetStockObject(BLACK_BRUSH));  // Load stock object
     for (int i=0; i<FL_N_BRUSH; i++) {
       if (brushes[i].brush)
         DeleteObject(brushes[i].brush); // delete all brushes in array
@@ -168,8 +171,8 @@ HBRUSH fl_brush_action(int action) {
     }
     i = imin;
     HGDIOBJ tmpbrush = GetStockObject(BLACK_BRUSH);  // get a stock brush
-    HGDIOBJ oldbrush = SelectObject(fl_gc,tmpbrush); // load in into current context
-    if (oldbrush != brushes[i].brush) SelectObject(fl_gc,oldbrush);  // reload old one
+    HGDIOBJ oldbrush = SelectObject(gc,tmpbrush); // load in into current context
+    if (oldbrush != brushes[i].brush) SelectObject(gc,oldbrush);  // reload old one
     DeleteObject(brushes[i].brush);      // delete the one in list
     brushes[i].brush = NULL;
     brushes[i].backref->brush = -1;
@@ -203,11 +206,11 @@ HPALETTE
 fl_select_palette(void)
 {
   static char beenhere;
+  HDC gc = (HDC)fl_graphics_driver->get_gc();
   if (!beenhere) {
     beenhere = 1;
 
-    //if (GetDeviceCaps(fl_gc, BITSPIXEL) > 8) return NULL;
-    int nColors = GetDeviceCaps(fl_gc, SIZEPALETTE);
+    int nColors = GetDeviceCaps(gc, SIZEPALETTE);
     if (nColors <= 0 || nColors > 256) return NULL;
     // this will try to work on < 256 color screens, but will probably
     // come out quite badly.
@@ -232,8 +235,8 @@ fl_select_palette(void)
     fl_palette = CreatePalette(pPal);
   }
   if (fl_palette) {
-    SelectPalette(fl_gc, fl_palette, FALSE);
-    RealizePalette(fl_gc);
+    SelectPalette(gc, fl_palette, FALSE);
+    RealizePalette(gc);
   }
   return fl_palette;
 }
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_font.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_font.cxx
index 07d9fbdba..e31f38234 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_font.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_font.cxx
@@ -113,10 +113,11 @@ enumcbw(CONST LOGFONTW    *lpelf,
 } /* enumcbw */
 
 Fl_Font Fl::set_fonts(const char* xstarname) {
+  HDC gc = (HDC)fl_graphics_driver->get_gc();
   if (fl_free_font == FL_FREE_FONT) {// if not already been called
-    if (!fl_gc) fl_GetDC(0);
+    if (!gc) gc = fl_GetDC(0);
 
-    EnumFontFamiliesW(fl_gc, NULL, (FONTENUMPROCW)enumcbw, xstarname != 0);
+    EnumFontFamiliesW(gc, NULL, (FONTENUMPROCW)enumcbw, xstarname != 0);
 
   }
   return (Fl_Font)fl_free_font;
@@ -168,8 +169,9 @@ Fl::get_font_sizes(Fl_Font fnum, int*& sizep) {
   Fl_Fontdesc *s = fl_fonts+fnum;
   if (!s->name) s = fl_fonts; // empty slot in table, use entry 0
 
-  if (!fl_gc) fl_GetDC(0);
-  cyPerInch = GetDeviceCaps(fl_gc, LOGPIXELSY);
+  HDC gc = (HDC)fl_graphics_driver->get_gc();
+  if (!gc) gc = fl_GetDC(0);
+  cyPerInch = GetDeviceCaps(gc, LOGPIXELSY);
   if (cyPerInch < 1) cyPerInch = 1;
 
 //  int l = fl_utf_nb_char((unsigned char*)s->name+1, strlen(s->name+1));
@@ -181,7 +183,7 @@ Fl::get_font_sizes(Fl_Font fnum, int*& sizep) {
   unsigned short *b = (unsigned short*) malloc((l + 1) * sizeof(short));
   l = fl_utf8toUtf16(nm, (unsigned) len, b, (l+1)); // Now do the conversion
   b[l] = 0;
-  EnumFontFamiliesW(fl_gc, (WCHAR*)b, (FONTENUMPROCW)EnumSizeCbW, 0);
+  EnumFontFamiliesW(gc, (WCHAR*)b, (FONTENUMPROCW)EnumSizeCbW, 0);
   free(b);
 
   sizep = sizes;
@@ -242,9 +244,10 @@ Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize fsize) {
     name	        // pointer to typeface name string
     );
   angle = fl_angle_;
-  if (!fl_gc) fl_GetDC(0);
-  SelectObject(fl_gc, fid);
-  GetTextMetrics(fl_gc, &metr);
+  HDC gc = (HDC)fl_graphics_driver->get_gc();
+  if (!gc) gc = fl_GetDC(0);
+  SelectObject(gc, fid);
+  GetTextMetrics(gc, &metr);
 //  BOOL ret = GetCharWidthFloat(fl_gc, metr.tmFirstChar, metr.tmLastChar, font->width+metr.tmFirstChar);
 // ...would be the right call, but is not implemented into Window95! (WinNT?)
   //GetCharWidth(fl_gc, 0, 255, width);
@@ -380,7 +383,7 @@ double Fl_GDI_Graphics_Driver::width(unsigned int c) {
   // This code assumes that these glyphs are rarely used and simply
   // measures them explicitly if they occur - This will be slow...
   if(c > 0x0000FFFF) { // UTF16 surrogate pair is needed
-    if (!fl_gc) { // We have no valid gc, so nothing to measure - bail out
+    if (!gc) { // We have no valid gc, so nothing to measure - bail out
       return 0.0;
     }
     int cc; // cell count
@@ -388,9 +391,9 @@ double Fl_GDI_Graphics_Driver::width(unsigned int c) {
     // Creates a UTF16 string from a UCS code point.
     cc = fl_ucs_to_Utf16(c, u16, 4);
     // Make sure the current font is selected before we make the measurement
-    SelectObject(fl_gc, fl_fontsize->fid);
+    SelectObject(gc, fl_fontsize->fid);
     // measure the glyph width
-    GetTextExtentPoint32W(fl_gc, (WCHAR*)u16, cc, &s);
+    GetTextExtentPoint32W(gc, (WCHAR*)u16, cc, &s);
     return (double)s.cx;
   }
   // else - this falls through to the lookup-table for glyph widths
@@ -411,19 +414,19 @@ double Fl_GDI_Graphics_Driver::width(unsigned int c) {
   // If that is null then we attempt to obtain the gc from the current screen
   // using (GetDC(NULL)).
   // This should resolve STR #2086
-  HDC gc = fl_gc;
+  HDC gc2 = gc;
   HWND hWnd = 0;
-  if (!gc) { // We have no valid gc, try and obtain one
+  if (!gc2) { // We have no valid gc, try and obtain one
     // Use our first fltk window, or fallback to using the screen via GetDC(NULL)
     hWnd = Fl::first_window() ? fl_xid(Fl::first_window()) : NULL;
-    gc = GetDC(hWnd);
+    gc2 = GetDC(hWnd);
   }
-  if (!gc) Fl::fatal("Invalid graphic context: fl_width() failed because no valid HDC was found!");
-  SelectObject(gc, fl_fontsize->fid);
+  if (!gc2) Fl::fatal("Invalid graphic context: fl_width() failed because no valid HDC was found!");
+  SelectObject(gc2, fl_fontsize->fid);
   ii += c &0x03FF;
-  GetTextExtentPoint32W(gc, (WCHAR*)&ii, 1, &s);
+  GetTextExtentPoint32W(gc2, (WCHAR*)&ii, 1, &s);
   fl_fontsize->width[r][c&0x03FF] = s.cx;
-  if (gc && gc!=fl_gc) ReleaseDC(hWnd, gc);
+  if (gc2 && gc2 != gc) ReleaseDC(hWnd, gc2);
   return (double) fl_fontsize->width[r][c & 0x03FF];
 }
 
@@ -447,11 +450,11 @@ static void GetGlyphIndices_init() {
   have_loaded_GetGlyphIndices = -1; // set this non-zero when we have attempted to load GetGlyphIndicesW
 } // GetGlyphIndices_init function
 
-static void on_printer_extents_update(int &dx, int &dy, int &w, int &h)
+static void on_printer_extents_update(int &dx, int &dy, int &w, int &h, HDC gc)
 // converts text extents from device coords to logical coords
 {
   POINT pt[3] = { {0, 0}, {dx, dy}, {dx+w, dy+h} };
-  DPtoLP(fl_gc, pt, 3);
+  DPtoLP(gc, pt, 3);
   w = pt[2].x - pt[1].x;
   h = pt[2].y - pt[1].y;
   dx = pt[1].x - pt[0].x;
@@ -459,8 +462,10 @@ static void on_printer_extents_update(int &dx, int &dy, int &w, int &h)
 }
 
 // if printer context, extents shd be converted to logical coords
-#define EXTENTS_UPDATE(x,y,w,h) \
-  if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) { on_printer_extents_update(x,y,w,h); }
+#define EXTENTS_UPDATE(x,y,w,h,gc) \
+  if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) { \
+    on_printer_extents_update(x,y,w,h,gc); \
+    }
 
 // Function to determine the extent of the "inked" area of the glyphs in a string
 void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy, int &w, int &h) {
@@ -481,7 +486,7 @@ void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy
   int minx = 0, miny = -999999;
   unsigned len = 0, idx = 0;
   HWND hWnd = 0;
-  HDC gc = fl_gc; // local copy of current gc - make a copy in case we change it...
+  HDC gc2 = gc; // local copy of current gc - make a copy in case we change it...
   int has_surrogates; // will be set if the string contains surrogate pairs
 
   // Have we loaded the GetGlyphIndicesW function yet?
@@ -493,12 +498,12 @@ void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy
 
   // The following code makes a best effort attempt to obtain a valid fl_gc.
   // See description in fl_width() above for an explanation.
-  if (!gc) { // We have no valid gc, try and obtain one
+  if (!gc2) { // We have no valid gc, try and obtain one
     // Use our first fltk window, or fallback to using the screen via GetDC(NULL)
     hWnd = Fl::first_window() ? fl_xid(Fl::first_window()) : NULL;
-    gc = GetDC(hWnd);
+    gc2 = GetDC(hWnd);
   }
-  if (!gc) goto exit_error; // no valid gc, attempt to use fallback measure
+  if (!gc2) goto exit_error; // no valid gc, attempt to use fallback measure
 
   // now convert the string to WCHAR and measure it
   len = fl_utf8toUtf16(c, n, ext_buff, wc_len);
@@ -510,7 +515,7 @@ void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy
     w_buff = new WORD[wc_len];
     len = fl_utf8toUtf16(c, n, ext_buff, wc_len);
   }
-  SelectObject(gc, fl_fontsize->fid);
+  SelectObject(gc2, fl_fontsize->fid);
 
   // Are there surrogate-pairs in this string? If so GetGlyphIndicesW will fail
   // since it can only handle the BMP range.
@@ -533,7 +538,7 @@ void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy
     gcp_res.nGlyphs = wc_len;
     gcp_res.lStructSize = sizeof(gcp_res);
 
-    DWORD dr = GetCharacterPlacementW(gc, (WCHAR*)ext_buff, len, 0, &gcp_res, GCP_GLYPHSHAPE);
+    DWORD dr = GetCharacterPlacementW(gc2, (WCHAR*)ext_buff, len, 0, &gcp_res, GCP_GLYPHSHAPE);
     if(dr) {
       len = gcp_res.nGlyphs;
     } else goto exit_error;
@@ -546,7 +551,7 @@ void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy
 
   // now we have the glyph array we measure each glyph in turn...
   for(idx = 0; idx < len; idx++){
-    if (GetGlyphOutlineW (gc, w_buff[idx], GGO_METRICS | GGO_GLYPH_INDEX,
+    if (GetGlyphOutlineW (gc2, w_buff[idx], GGO_METRICS | GGO_GLYPH_INDEX,
                           &metrics, 0, NULL, &matrix) == GDI_ERROR) {
       goto exit_error;
     }
@@ -562,7 +567,7 @@ void Fl_GDI_Graphics_Driver::text_extents(const char *c, int n, int &dx, int &dy
   h = maxh + miny;
   dx = minx;
   dy = -miny;
-  EXTENTS_UPDATE(dx, dy, w, h);
+  EXTENTS_UPDATE(dx, dy, w, h, gc);
   return; // normal exit
 
 exit_error:
@@ -571,38 +576,38 @@ exit_error:
   h = height();
   dx = 0;
   dy = descent() - h;
-  EXTENTS_UPDATE(dx, dy, w, h);
+  EXTENTS_UPDATE(dx, dy, w, h, gc);
   return;
 } // fl_text_extents
 
 void Fl_GDI_Graphics_Driver::draw(const char* str, int n, int x, int y) {
-  COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
+  COLORREF oldColor = SetTextColor(gc, fl_RGB());
   // avoid crash if no font has been set yet
   if (!font_descriptor()) this->font(FL_HELVETICA, FL_NORMAL_SIZE);
-  SelectObject(fl_gc, font_descriptor()->fid);
+  SelectObject(gc, font_descriptor()->fid);
   int wn = fl_utf8toUtf16(str, n, wstr, wstr_len);
   if(wn >= wstr_len) {
     wstr = (unsigned short*) realloc(wstr, sizeof(unsigned short) * (wn + 1));
     wstr_len = wn + 1;
     wn = fl_utf8toUtf16(str, n, wstr, wstr_len);
   }
-  TextOutW(fl_gc, x, y, (WCHAR*)wstr, wn);
-  SetTextColor(fl_gc, oldColor); // restore initial state
+  TextOutW(gc, x, y, (WCHAR*)wstr, wn);
+  SetTextColor(gc, oldColor); // restore initial state
 }
 
 void Fl_GDI_Graphics_Driver::draw(int angle, const char* str, int n, int x, int y) {
   fl_font(this, Fl_Graphics_Driver::font(), size(), angle);
   int wn = 0; // count of UTF16 cells to render full string
-  COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
-  SelectObject(fl_gc, font_descriptor()->fid);
+  COLORREF oldColor = SetTextColor(gc, fl_RGB());
+  SelectObject(gc, font_descriptor()->fid);
   wn = fl_utf8toUtf16(str, n, wstr, wstr_len);
   if(wn >= wstr_len) { // Array too small
     wstr = (unsigned short*) realloc(wstr, sizeof(unsigned short) * (wn + 1));
     wstr_len = wn + 1;
     wn = fl_utf8toUtf16(str, n, wstr, wstr_len); // respin the translation
   }
-  TextOutW(fl_gc, x, y, (WCHAR*)wstr, wn);
-  SetTextColor(fl_gc, oldColor);
+  TextOutW(gc, x, y, (WCHAR*)wstr, wn);
+  SetTextColor(gc, oldColor);
   fl_font(this, Fl_Graphics_Driver::font(), size(), 0);
 }
 
@@ -615,26 +620,26 @@ void Fl_GDI_Graphics_Driver::rtl_draw(const char* c, int n, int x, int y) {
     wn = fl_utf8toUtf16(c, n, wstr, wstr_len);
   }
 
-  COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
-  SelectObject(fl_gc, font_descriptor()->fid);
+  COLORREF oldColor = SetTextColor(gc, fl_RGB());
+  SelectObject(gc, font_descriptor()->fid);
 #ifdef RTL_CHAR_BY_CHAR
   int i = 0;
   int lx = 0;
   while (i < wn) { // output char by char is very bad for Arabic but coherent with fl_width()
     lx = (int) width(wstr[i]);
     x -= lx;
-    TextOutW(fl_gc, x, y, (WCHAR*)wstr + i, 1);
+    TextOutW(gc, x, y, (WCHAR*)wstr + i, 1);
     if (fl_nonspacing(wstr[i])) {
       x += lx;
     }
     i++;
   }
 #else
-  UINT old_align = SetTextAlign(fl_gc, TA_RIGHT | TA_RTLREADING);
-  TextOutW(fl_gc, x, y - height() + descent(), (WCHAR*)wstr, wn);
-  SetTextAlign(fl_gc, old_align);
+  UINT old_align = SetTextAlign(gc, TA_RIGHT | TA_RTLREADING);
+  TextOutW(gc, x, y - height() + descent(), (WCHAR*)wstr, wn);
+  SetTextAlign(gc, old_align);
 #endif
-  SetTextColor(fl_gc, oldColor);
+  SetTextColor(gc, oldColor);
 }
 #endif
 //
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_image.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_image.cxx
index eecb07fd7..3a128b69f 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_image.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_image.cxx
@@ -108,7 +108,7 @@ static void monodither(uchar* to, const uchar* from, int w, int delta) {
 
 static void innards(const uchar *buf, int X, int Y, int W, int H,
 		    int delta, int linedelta, int depth,
-		    Fl_Draw_Image_Cb cb, void* userdata)
+		    Fl_Draw_Image_Cb cb, void* userdata, HDC gc)
 {
   char indexed = 0;
 
@@ -254,7 +254,7 @@ static void innards(const uchar *buf, int X, int Y, int W, int H,
     if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) {
       // if print context, device and logical units are not equal, so SetDIBitsToDevice
       // does not do the expected job, whereas StretchDIBits does it.
-      StretchDIBits(fl_gc, x, y+j-k, w, k, 0, 0, w, k,
+      StretchDIBits(gc, x, y+j-k, w, k, 0, 0, w, k,
 		    (LPSTR)((uchar*)buffer+(blocking-k)*linesize),
 		    &bmi,
 #if USE_COLORMAP
@@ -268,7 +268,7 @@ static void innards(const uchar *buf, int X, int Y, int W, int H,
       buffer_size = 0;
     }
     else {
-      SetDIBitsToDevice(fl_gc, x, y+j-k, w, k, 0, 0, 0, k,
+      SetDIBitsToDevice(gc, x, y+j-k, w, k, 0, 0, 0, k,
 			(LPSTR)((uchar*)buffer+(blocking-k)*linesize),
 			&bmi,
 #if USE_COLORMAP
@@ -286,9 +286,9 @@ static int fl_abs(int v) { return v<0 ? -v : v; }
 void Fl_GDI_Graphics_Driver::draw_image(const uchar* buf, int x, int y, int w, int h, int d, int l){
   if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
     d ^= FL_IMAGE_WITH_ALPHA;
-    innards(buf,x,y,w,h,d,l,fl_abs(d),0,0);
+    innards(buf,x,y,w,h,d,l,fl_abs(d),0,0, gc);
   } else {
-    innards(buf,x,y,w,h,d,l,(d<3&&d>-3),0,0);
+    innards(buf,x,y,w,h,d,l,(d<3&&d>-3),0,0, gc);
   }
 }
 
@@ -296,18 +296,18 @@ void Fl_GDI_Graphics_Driver::draw_image(Fl_Draw_Image_Cb cb, void* data,
 		   int x, int y, int w, int h,int d) {
   if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
     d ^= FL_IMAGE_WITH_ALPHA;
-    innards(0,x,y,w,h,d,0,(d<3&&d>-3),cb,data);
+    innards(0,x,y,w,h,d,0,(d<3&&d>-3),cb,data, gc);
   } else {
-    innards(0,x,y,w,h,d,0,(d<3&&d>-3),cb,data);
+    innards(0,x,y,w,h,d,0,(d<3&&d>-3),cb,data, gc);
   }
 }
 
 void Fl_GDI_Graphics_Driver::draw_image_mono(const uchar* buf, int x, int y, int w, int h, int d, int l){
   if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
     d ^= FL_IMAGE_WITH_ALPHA;
-    innards(buf,x,y,w,h,d,l,1,0,0);
+    innards(buf,x,y,w,h,d,l,1,0,0, gc);
   } else {
-    innards(buf,x,y,w,h,d,l,1,0,0);
+    innards(buf,x,y,w,h,d,l,1,0,0, gc);
   }
 }
 
@@ -315,9 +315,9 @@ void Fl_GDI_Graphics_Driver::draw_image_mono(Fl_Draw_Image_Cb cb, void* data,
 		   int x, int y, int w, int h,int d) {
   if (fl_abs(d)&FL_IMAGE_WITH_ALPHA) {
     d ^= FL_IMAGE_WITH_ALPHA;
-    innards(0,x,y,w,h,d,0,1,cb,data);
+    innards(0,x,y,w,h,d,0,1,cb,data, gc);
   } else {
-    innards(0,x,y,w,h,d,0,1,cb,data);
+    innards(0,x,y,w,h,d,0,1,cb,data, gc);
   }
 }
 
@@ -327,7 +327,7 @@ void fl_rectf(int x, int y, int w, int h, uchar r, uchar g, uchar b) {
   if (fl_palette) {
     uchar c[3];
     c[0] = r; c[1] = g; c[2] = b;
-    innards(c,x,y,w,h,0,0,0,0,0);
+    innards(c,x,y,w,h,0,0,0,0,0,(HDC)fl_graphics_driver->get_gc());
     return;
   }
 #endif
@@ -346,8 +346,8 @@ Fl_Bitmask Fl_GDI_Graphics_Driver::create_bitmask(int w, int h, const uchar *dat
   static uchar loNibble[16] =
   { 0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
     0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f };
-  int np  = GetDeviceCaps(fl_gc, PLANES);	//: was always one on sample machines
-  int bpp = GetDeviceCaps(fl_gc, BITSPIXEL);//: 1,4,8,16,24,32 and more odd stuff?
+  int np  = GetDeviceCaps(gc, PLANES);	//: was always one on sample machines
+  int bpp = GetDeviceCaps(gc, BITSPIXEL);//: 1,4,8,16,24,32 and more odd stuff?
   int Bpr = (bpp*w+7)/8;			//: bytes per row
   int pad = Bpr&1, w1 = (w+7)/8, shr = ((w-1)&7)+1;
   if (bpp==4) shr = (shr+1)/2;
@@ -404,12 +404,12 @@ void Fl_GDI_Graphics_Driver::draw(Fl_Bitmap *bm, int XP, int YP, int WP, int HP,
     return;
   }
 
-  HDC tempdc = CreateCompatibleDC(fl_gc);
+  HDC tempdc = CreateCompatibleDC(gc);
   int save = SaveDC(tempdc);
   SelectObject(tempdc, (HGDIOBJ)bm->id_);
-  SelectObject(fl_gc, fl_brush());
+  SelectObject(gc, fl_brush());
   // secret bitblt code found in old MSWindows reference manual:
-  BitBlt(fl_gc, X, Y, W, H, tempdc, cx, cy, 0xE20746L);
+  BitBlt(gc, X, Y, W, H, tempdc, cx, cy, 0xE20746L);
   RestoreDC(tempdc, save);
   DeleteDC(tempdc);
 }
@@ -447,15 +447,16 @@ void Fl_GDI_Printer_Graphics_Driver::draw(Fl_Bitmap *bm, int XP, int YP, int WP,
   fl_color(background);
   fl_rectf(0,0,W,H); // use this color as offscreen background
   fl_color(save_c); // back to bitmap's color
-  tempdc = CreateCompatibleDC(fl_gc);
+  HDC off_gc = (HDC)fl_graphics_driver->get_gc();
+  tempdc = CreateCompatibleDC(off_gc);
   save = SaveDC(tempdc);
   SelectObject(tempdc, (HGDIOBJ)bm->id_);
-  SelectObject(fl_gc, fl_brush()); // use bitmap's desired color
-  BitBlt(fl_gc, 0, 0, W, H, tempdc, 0, 0, 0xE20746L); // draw bitmap to offscreen
+  SelectObject(off_gc, fl_brush()); // use bitmap's desired color
+  BitBlt(off_gc, 0, 0, W, H, tempdc, 0, 0, 0xE20746L); // draw bitmap to offscreen
   fl_end_offscreen(); // offscreen data is in tmp_id
   SelectObject(tempdc, (HGDIOBJ)tmp_id); // use offscreen data
                                          // draw it to printer context with background color as transparent
-  fl_TransparentBlt(fl_gc, X,Y,W,H, tempdc, cx, cy, bm->w(), bm->h(), RGB(r, g, b) );
+  fl_TransparentBlt(gc, X,Y,W,H, tempdc, cx, cy, bm->w(), bm->h(), RGB(r, g, b) );
   fl_delete_offscreen(tmp_id);
   RestoreDC(tempdc, save);
   DeleteDC(tempdc);
@@ -510,12 +511,12 @@ void Fl_GDI_Graphics_Driver::draw(Fl_RGB_Image *img, int XP, int YP, int WP, int
   }
   if (!img->id_) img->id_ = (fl_uintptr_t)build_id(img, (void**)&(img->mask_));
   if (img->mask_) {
-    HDC new_gc = CreateCompatibleDC(fl_gc);
+    HDC new_gc = CreateCompatibleDC(gc);
     int save = SaveDC(new_gc);
     SelectObject(new_gc, (void*)img->mask_);
-    BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCAND);
+    BitBlt(gc, X, Y, W, H, new_gc, cx, cy, SRCAND);
     SelectObject(new_gc, (void*)img->id_);
-    BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCPAINT);
+    BitBlt(gc, X, Y, W, H, new_gc, cx, cy, SRCPAINT);
     RestoreDC(new_gc,save);
     DeleteDC(new_gc);
   } else if (img->d()==2 || img->d()==4) {
@@ -527,15 +528,15 @@ void Fl_GDI_Graphics_Driver::draw(Fl_RGB_Image *img, int XP, int YP, int WP, int
 
 int Fl_GDI_Printer_Graphics_Driver::draw_scaled(Fl_Image *img, int XP, int YP, int WP, int HP) {
   XFORM old_tr, tr;
-  GetWorldTransform(fl_gc, &old_tr); // storing old transform
+  GetWorldTransform(gc, &old_tr); // storing old transform
   tr.eM11 = float(WP)/float(img->w());
   tr.eM22 = float(HP)/float(img->h());
   tr.eM12 = tr.eM21 = 0;
   tr.eDx =  float(XP);
   tr.eDy =  float(YP);
-  ModifyWorldTransform(fl_gc, &tr, MWT_LEFTMULTIPLY);
+  ModifyWorldTransform(gc, &tr, MWT_LEFTMULTIPLY);
   img->draw(0, 0, img->w(), img->h(), 0, 0);
-  SetWorldTransform(fl_gc, &old_tr);
+  SetWorldTransform(gc, &old_tr);
   return 1;
 }
 
@@ -592,12 +593,12 @@ void Fl_GDI_Graphics_Driver::draw(Fl_Pixmap *pxm, int XP, int YP, int WP, int HP
   int X, Y, W, H;
   if (pxm->prepare(XP, YP, WP, HP, cx, cy, X, Y, W, H)) return;
   if (pxm->mask_) {
-    HDC new_gc = CreateCompatibleDC(fl_gc);
+    HDC new_gc = CreateCompatibleDC(gc);
     int save = SaveDC(new_gc);
     SelectObject(new_gc, (void*)pxm->mask_);
-    BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCAND);
+    BitBlt(gc, X, Y, W, H, new_gc, cx, cy, SRCAND);
     SelectObject(new_gc, (void*)pxm->id_);
-    BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCPAINT);
+    BitBlt(gc, X, Y, W, H, new_gc, cx, cy, SRCPAINT);
     RestoreDC(new_gc,save);
     DeleteDC(new_gc);
   } else {
@@ -617,11 +618,11 @@ void Fl_GDI_Printer_Graphics_Driver::draw(Fl_Pixmap *pxm, int XP, int YP, int WP
     if(hMod) fl_TransparentBlt = (fl_transp_func)GetProcAddress(hMod, "TransparentBlt");
   }
   if (fl_TransparentBlt) {
-    HDC new_gc = CreateCompatibleDC(fl_gc);
+    HDC new_gc = CreateCompatibleDC(gc);
     int save = SaveDC(new_gc);
     SelectObject(new_gc, (void*)pxm->id_);
     // print all of offscreen but its parts in background color
-    fl_TransparentBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, W, H, pxm->pixmap_bg_color );
+    fl_TransparentBlt(gc, X, Y, W, H, new_gc, cx, cy, W, H, pxm->pixmap_bg_color );
     RestoreDC(new_gc,save);
     DeleteDC(new_gc);
   }
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_line_style.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_line_style.cxx
index 385586b2c..b855a1349 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_line_style.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_line_style.cxx
@@ -63,7 +63,7 @@ void Fl_GDI_Graphics_Driver::line_style(int style, int width, char* dashes) {
     Fl::error("fl_line_style(): Could not create GDI pen object.");
     return;
   }
-  HPEN oldpen = (HPEN)SelectObject(fl_gc, newpen);
+  HPEN oldpen = (HPEN)SelectObject(gc, newpen);
   DeleteObject(oldpen);
   DeleteObject(fl_current_xmap->pen);
   fl_current_xmap->pen = newpen;
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_rect.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_rect.cxx
index 796896cdd..78b3482aa 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_rect.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_rect.cxx
@@ -36,16 +36,16 @@
 // --- line and polygon drawing with integer coordinates
 
 void Fl_GDI_Graphics_Driver::point(int x, int y) {
-  SetPixel(fl_gc, x, y, fl_RGB());
+  SetPixel(gc, x, y, fl_RGB());
 }
 
 void Fl_GDI_Graphics_Driver::rect(int x, int y, int w, int h) {
   if (w<=0 || h<=0) return;
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x+w-1, y);
-  LineTo(fl_gc, x+w-1, y+h-1);
-  LineTo(fl_gc, x, y+h-1);
-  LineTo(fl_gc, x, y);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x+w-1, y);
+  LineTo(gc, x+w-1, y+h-1);
+  LineTo(gc, x, y+h-1);
+  LineTo(gc, x, y);
 }
 
 void Fl_GDI_Graphics_Driver::focus_rect(int x, int y, int w, int h) {
@@ -64,79 +64,79 @@ void Fl_GDI_Graphics_Driver::rectf(int x, int y, int w, int h) {
   RECT rect;
   rect.left = x; rect.top = y;
   rect.right = x + w; rect.bottom = y + h;
-  FillRect(fl_gc, &rect, fl_brush());
+  FillRect(gc, &rect, fl_brush());
 }
 
 void Fl_GDI_Graphics_Driver::line(int x, int y, int x1, int y1) {
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x1, y1);
-  SetPixel(fl_gc, x1, y1, fl_RGB());
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x1, y1);
+  SetPixel(gc, x1, y1, fl_RGB());
 }
 
 void Fl_GDI_Graphics_Driver::line(int x, int y, int x1, int y1, int x2, int y2) {
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x1, y1);
-  LineTo(fl_gc, x2, y2);
-  SetPixel(fl_gc, x2, y2, fl_RGB());
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x1, y1);
+  LineTo(gc, x2, y2);
+  SetPixel(gc, x2, y2, fl_RGB());
 }
 
 void Fl_GDI_Graphics_Driver::xyline(int x, int y, int x1) {
-  MoveToEx(fl_gc, x, y, 0L); LineTo(fl_gc, x1+1, y);
+  MoveToEx(gc, x, y, 0L); LineTo(gc, x1+1, y);
 }
 
 void Fl_GDI_Graphics_Driver::xyline(int x, int y, int x1, int y2) {
   if (y2 < y) y2--;
   else y2++;
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x1, y);
-  LineTo(fl_gc, x1, y2);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x1, y);
+  LineTo(gc, x1, y2);
 }
 
 void Fl_GDI_Graphics_Driver::xyline(int x, int y, int x1, int y2, int x3) {
   if(x3 < x1) x3--;
   else x3++;
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x1, y);
-  LineTo(fl_gc, x1, y2);
-  LineTo(fl_gc, x3, y2);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x1, y);
+  LineTo(gc, x1, y2);
+  LineTo(gc, x3, y2);
 }
 
 void Fl_GDI_Graphics_Driver::yxline(int x, int y, int y1) {
   if (y1 < y) y1--;
   else y1++;
-  MoveToEx(fl_gc, x, y, 0L); LineTo(fl_gc, x, y1);
+  MoveToEx(gc, x, y, 0L); LineTo(gc, x, y1);
 }
 
 void Fl_GDI_Graphics_Driver::yxline(int x, int y, int y1, int x2) {
   if (x2 > x) x2++;
   else x2--;
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x, y1);
-  LineTo(fl_gc, x2, y1);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x, y1);
+  LineTo(gc, x2, y1);
 }
 
 void Fl_GDI_Graphics_Driver::yxline(int x, int y, int y1, int x2, int y3) {
   if(y3<y1) y3--;
   else y3++;
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x, y1);
-  LineTo(fl_gc, x2, y1);
-  LineTo(fl_gc, x2, y3);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x, y1);
+  LineTo(gc, x2, y1);
+  LineTo(gc, x2, y3);
 }
 
 void Fl_GDI_Graphics_Driver::loop(int x, int y, int x1, int y1, int x2, int y2) {
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x1, y1);
-  LineTo(fl_gc, x2, y2);
-  LineTo(fl_gc, x, y);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x1, y1);
+  LineTo(gc, x2, y2);
+  LineTo(gc, x, y);
 }
 
 void Fl_GDI_Graphics_Driver::loop(int x, int y, int x1, int y1, int x2, int y2, int x3, int y3) {
-  MoveToEx(fl_gc, x, y, 0L);
-  LineTo(fl_gc, x1, y1);
-  LineTo(fl_gc, x2, y2);
-  LineTo(fl_gc, x3, y3);
-  LineTo(fl_gc, x, y);
+  MoveToEx(gc, x, y, 0L);
+  LineTo(gc, x1, y1);
+  LineTo(gc, x2, y2);
+  LineTo(gc, x3, y3);
+  LineTo(gc, x, y);
 }
 
 void Fl_GDI_Graphics_Driver::polygon(int x, int y, int x1, int y1, int x2, int y2) {
@@ -144,8 +144,8 @@ void Fl_GDI_Graphics_Driver::polygon(int x, int y, int x1, int y1, int x2, int y
   p[0].x = x;  p[0].y = y;
   p[1].x = x1; p[1].y = y1;
   p[2].x = x2; p[2].y = y2;
-  SelectObject(fl_gc, fl_brush());
-  Polygon(fl_gc, p, 3);
+  SelectObject(gc, fl_brush());
+  Polygon(gc, p, 3);
 }
 
 void Fl_GDI_Graphics_Driver::polygon(int x, int y, int x1, int y1, int x2, int y2, int x3, int y3) {
@@ -154,8 +154,8 @@ void Fl_GDI_Graphics_Driver::polygon(int x, int y, int x1, int y1, int x2, int y
   p[1].x = x1; p[1].y = y1;
   p[2].x = x2; p[2].y = y2;
   p[3].x = x3; p[3].y = y3;
-  SelectObject(fl_gc, fl_brush());
-  Polygon(fl_gc, p, 4);
+  SelectObject(gc, fl_brush());
+  Polygon(gc, p, 4);
 }
 
 // --- clipping
@@ -197,7 +197,7 @@ int Fl_GDI_Graphics_Driver::clip_box(int x, int y, int w, int h, int& X, int& Y,
     GetRgnBox(temp, &rect);
     if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) { // if print context, convert coords from device to logical
       POINT pt[2] = { {rect.left, rect.top}, {rect.right, rect.bottom} };
-      DPtoLP(fl_gc, pt, 2);
+      DPtoLP(gc, pt, 2);
       X = pt[0].x; Y = pt[0].y; W = pt[1].x - X; H = pt[1].y - Y;
     }
     else {
@@ -217,7 +217,7 @@ int Fl_GDI_Graphics_Driver::not_clipped(int x, int y, int w, int h) {
   RECT rect;
   if (Fl_Surface_Device::surface() != Fl_Display_Device::display_device()) { // in case of print context, convert coords from logical to device
     POINT pt[2] = { {x, y}, {x + w, y + h} };
-    LPtoDP(fl_gc, pt, 2);
+    LPtoDP(gc, pt, 2);
     rect.left = pt[0].x; rect.top = pt[0].y; rect.right = pt[1].x; rect.bottom = pt[1].y;
   } else {
     rect.left = x; rect.top = y; rect.right = x+w; rect.bottom = y+h;
@@ -244,7 +244,7 @@ void Fl_GDI_Graphics_Driver::pop_clip() {
 void Fl_GDI_Graphics_Driver::restore_clip() {
   fl_clip_state_number++;
   Fl_Region r = rstack[rstackptr];
-  SelectClipRgn(fl_gc, r); //if r is NULL, clip is automatically cleared
+  SelectClipRgn(gc, r); //if r is NULL, clip is automatically cleared
 }
 
 
diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver_vertex.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver_vertex.cxx
index ee12c9ad8..4107a47fc 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver_vertex.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver_vertex.cxx
@@ -41,7 +41,7 @@ void Fl_GDI_Graphics_Driver::vertex(double x,double y) {
 }
 
 void Fl_GDI_Graphics_Driver::end_points() {
-  for (int i=0; i<n; i++) SetPixel(fl_gc, p[i].x, p[i].y, fl_RGB());
+  for (int i=0; i<n; i++) SetPixel(gc, p[i].x, p[i].y, fl_RGB());
 }
 
 void Fl_GDI_Graphics_Driver::end_line() {
@@ -49,7 +49,7 @@ void Fl_GDI_Graphics_Driver::end_line() {
     end_points();
     return;
   }
-  if (n>1) Polyline(fl_gc, p, n);
+  if (n>1) Polyline(gc, p, n);
 }
 
 void Fl_GDI_Graphics_Driver::end_loop() {
@@ -65,8 +65,8 @@ void Fl_GDI_Graphics_Driver::end_polygon() {
     return;
   }
   if (n>2) {
-    SelectObject(fl_gc, fl_brush());
-    Polygon(fl_gc, p, n);
+    SelectObject(gc, fl_brush());
+    Polygon(gc, p, n);
   }
 }
 
@@ -94,8 +94,8 @@ void Fl_GDI_Graphics_Driver::end_complex_polygon() {
     return;
   }
   if (n>2) {
-    SelectObject(fl_gc, fl_brush());
-    PolyPolygon(fl_gc, p, counts, numcount);
+    SelectObject(gc, fl_brush());
+    PolyPolygon(gc, p, counts, numcount);
   }
 }
 
@@ -114,10 +114,10 @@ void Fl_GDI_Graphics_Driver::circle(double x, double y,double r) {
   int h = (int)rint(yt+ry)-lly;
 
   if (what==POLYGON) {
-    SelectObject(fl_gc, fl_brush());
-    Pie(fl_gc, llx, lly, llx+w, lly+h, 0,0, 0,0); 
+    SelectObject(gc, fl_brush());
+    Pie(gc, llx, lly, llx+w, lly+h, 0,0, 0,0);
   } else
-    Arc(fl_gc, llx, lly, llx+w, lly+h, 0,0, 0,0); 
+    Arc(gc, llx, lly, llx+w, lly+h, 0,0, 0,0); 
 }
 
 #endif // FL_CFG_GFX_GDI_VERTEX_CXX