libs-back/Source/cairo/CairoContext.m

/*
   CairoContext.m

   Copyright (C) 2003 Free Software Foundation, Inc.

   August 31, 2003
   Written by Banlu Kemiyatorn <object at gmail dot com>

   This file is part of GNUstep.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; see the file COPYING.LIB.
   If not, see <http://www.gnu.org/licenses/> or write to the 
   Free Software Foundation, 51 Franklin Street, Fifth Floor, 
   Boston, MA 02110-1301, USA.
*/

#include <AppKit/NSBitmapImageRep.h>
#include <AppKit/NSGraphics.h>
#include <AppKit/NSPrintInfo.h>
#include <AppKit/NSPrintOperation.h>

#include "cairo/CairoContext.h"
#include "cairo/CairoSurface.h"
#include "cairo/CairoPSSurface.h"
#include "cairo/CairoPDFSurface.h"
#include "cairo/CairoFontInfo.h"
#include "cairo/CairoFontEnumerator.h"
#include "config.h"

#define CGSTATE ((CairoGState *)gstate)

#if BUILD_SERVER == SERVER_x11
#  include "cairo/CairoGState.h"
#  include "x11/XGServer.h"
#  define _CAIRO_GSTATE_CLASSNAME CairoGState
#  ifdef USE_GLITZ
#    define _CAIRO_SURFACE_CLASSNAME XGCairoGlitzSurface
#    include "cairo/XGCairoGlitzSurface.h"
#  else
//#    define _CAIRO_SURFACE_CLASSNAME XGCairoSurface
//#    include "cairo/XGCairoSurface.h"
//#    define _CAIRO_SURFACE_CLASSNAME XGCairoXImageSurface
//#    include "cairo/XGCairoXImageSurface.h"
#    define _CAIRO_SURFACE_CLASSNAME XGCairoModernSurface
#    include "cairo/XGCairoModernSurface.h"
#  endif /* USE_GLITZ */
#  include "x11/XGServerWindow.h"
#  include "x11/XWindowBuffer.h"
#elif BUILD_SERVER == SERVER_win32
#  include "cairo/Win32CairoGState.h"
#  include <windows.h>
#  include "win32/WIN32Server.h"
#  include "win32/WIN32Geometry.h"
#  define _CAIRO_GSTATE_CLASSNAME Win32CairoGState
#  ifdef USE_GLITZ
#    define _CAIRO_SURFACE_CLASSNAME Win32CairoGlitzSurface
#    include "cairo/Win32CairoGlitzSurface.h"
#  else
#    define _CAIRO_SURFACE_CLASSNAME Win32CairoSurface
#    include "cairo/Win32CairoSurface.h"
#  endif /* USE_GLITZ */
#else
#  error Invalid server for Cairo backend : non implemented
#endif /* BUILD_SERVER */

@implementation CairoContext

+ (void) initializeBackend
{
  [NSGraphicsContext setDefaultContextClass: self];

  [GSFontEnumerator setDefaultClass: [CairoFontEnumerator class]];
  [GSFontInfo setDefaultClass: [CairoFontInfo class]];
}

+ (Class) GStateClass
{
  return [_CAIRO_GSTATE_CLASSNAME class];
}

+ (BOOL) handlesPS
{
  return YES;
}

- (BOOL) supportsDrawGState
{
  return YES;
}

- (BOOL) isDrawingToScreen
{
  CairoSurface *surface = nil;
  [CGSTATE GSCurrentSurface: &surface : NULL : NULL];
  return [surface isDrawingToScreen];
}

- (void) flushGraphics
{
  // FIXME: Why is this here? When is it called?
  // Comments added 07/20/2013 to address the above question after
  // further debugging cairo/MSwindows non-retained backing store type:
  // This is called from NSWindow/flushWindow for the non-retained backing
  // store case.  This code originally seems to have been added due to the 
  // non-retained backing store type NOT showing up on XWindows/Cairo
  // combination and added this XFlush call to handle this case.
  
  // For MSWindows a similar problem seems to occur. However, the only
  // equivalent to XFlush on MSWindows is GdiFlush, which doesn't cause
  // the window to re-display properly.  So, on MSWindows, the non-retained
  // cairo backend surface is currently excluded from the build and we
  // handle it as a buffered window expose event for now.
  // FIXME:  Anyone know how this can be handled/fixed correctly...
  
#if BUILD_SERVER == SERVER_x11
  XFlush([(XGServer *)server xDisplay]);
#elif BUILD_SERVER == SERVER_win32
  CairoSurface *surface = nil;

  [CGSTATE GSCurrentSurface: &surface : NULL : NULL];
  if ((surface != nil) && ([surface surface] != NULL))
    {
      // Non-retained backing store types currently unsupported on MSWindows...
      // Currently handling such windows as buffered and invoking the handle
      // expose event processing...
      RECT    rect;
      HWND    hwnd  = surface->gsDevice;
      GetClientRect(hwnd, &rect);
      NSRect  frame = MSWindowRectToGS((WIN32Server*)GSCurrentServer(), hwnd, rect);
      [[self class] handleExposeRect: frame forDriver: surface];
    }
#endif
}


/* Private backend methods */
+ (void) handleExposeRect: (NSRect)rect forDriver: (void *)driver
{
#if BUILD_SERVER == SERVER_x11
  if ([(id)driver isKindOfClass: [XWindowBuffer class]])
    {
      // For XGCairoXImageSurface
      [(XWindowBuffer *)driver _exposeRect: rect];
    }
  else
#endif
  if ([(id)driver isKindOfClass: [CairoSurface class]])
    {
      // For XGCairoModernSurface
      [(CairoSurface *)driver handleExposeRect: rect];
    }
}

#if BUILD_SERVER == SERVER_x11

#ifdef XSHM

+ (void) _gotShmCompletion: (Drawable)d
{
  [XWindowBuffer _gotShmCompletion: d];
}

- (void) gotShmCompletion: (Drawable)d
{
  [XWindowBuffer _gotShmCompletion: d];
}

#endif // XSHM

#endif // BUILD_SERVER = SERVER_x11

@end 

@implementation CairoContext (Ops) 

- (BOOL) isCompatibleBitmap: (NSBitmapImageRep*)bitmap
{
  NSString *colorSpaceName;

  if ([bitmap bitmapFormat] != 0)
    {
      return NO;
    }

  if ([bitmap isPlanar])
    {
      return NO;
    }

  if ([bitmap bitsPerSample] != 8)
    {
      return NO;
    }

  colorSpaceName = [bitmap colorSpaceName];
  if (![colorSpaceName isEqualToString: NSDeviceRGBColorSpace] &&
      ![colorSpaceName isEqualToString: NSCalibratedRGBColorSpace])
    {
      return NO;
    }
  else
    {
      return YES;
    }
}

- (void) GSCurrentDevice: (void **)device : (int *)x : (int *)y
{
  CairoSurface *surface;

  [CGSTATE GSCurrentSurface: &surface : x : y];
  if (device)
    {
      *device = surface->gsDevice;
    }
}

- (void) GSSetDevice: (void *)device : (int)x : (int)y
{
  CairoSurface *surface;

  surface = [[_CAIRO_SURFACE_CLASSNAME alloc] initWithDevice: device];

  [CGSTATE GSSetSurface: surface : x : y];
  [surface release];
}

- (void) beginPrologueBBox: (NSRect)boundingBox
              creationDate: (NSString*)dateCreated
                 createdBy: (NSString*)anApplication
                     fonts: (NSString*)fontNames
                   forWhom: (NSString*)user
                     pages: (int)numPages
                     title: (NSString*)aTitle
{
  CairoSurface *surface;
  NSSize size;
  NSString *contextType;

  NSPrintOperation *printOp = [NSPrintOperation currentOperation];
  NSPrintInfo *printInfo = [printOp printInfo];

  if (printInfo != nil)
    {
      size = [printInfo paperSize];

      // FIXME: This is confusing..
      // When an 8.5x11 page is set to landscape,
      // NSPrintInfo also swaps the paperSize to be 11x8.5,
      // but gui also adds a 90 degree rotation as if it will
      // be drawing on a 8.5x11 page. So, swap 11x8.5 back to
      // 8.5x11 here.
      if ([printInfo orientation] == NSLandscapeOrientation)
	{
	  size = NSMakeSize(size.height, size.width);
	}
    }
  else
    {
      [NSException raise: NSInternalInconsistencyException
		  format: @"current print operation printInfo is nil in %@",
		   NSStringFromSelector(_cmd)];
      return;
    }

  contextType = [context_info objectForKey:
			 NSGraphicsContextRepresentationFormatAttributeName];

  if (contextType)
    {
      if ([contextType isEqual: NSGraphicsContextPSFormat])
        {
          surface = [[CairoPSSurface alloc] initWithDevice: context_info];
          [surface setSize: size];
          // This strange setting is needed because of the way GUI handles offset.
          [CGSTATE GSSetSurface: surface : 0.0 : size.height];
          RELEASE(surface);
        }
      else if ([contextType isEqual: NSGraphicsContextPDFFormat])
        {
          surface = [[CairoPDFSurface alloc] initWithDevice: context_info];
          [surface setSize: size];
          // This strange setting is needed because of the way GUI handles offset.
          [CGSTATE GSSetSurface: surface : 0.0 : size.height];
          RELEASE(surface);
        }
    }
}

- (void) showPage
{
  [CGSTATE showPage];
}

@end

#undef _CAIRO_SURFACE_CLASSNAME
#undef _CAIRO_GSTATE_CLASSNAME