libs-back/Source/winlib/WIN32FontInfo.m

/* Win32FontInfo - Implements font enumerator for MSWindows

   Copyright (C) 2002 Free Software Foundation, Inc.

   Written by: Fred Kiefer <FredKiefer@gmx.de>
   Date: March 2002
   
   This file is part of the GNU Objective C User Interface Library.

   This library 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.
   
   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
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02111 USA.
*/


#include <Foundation/NSCharacterSet.h>
#include <Foundation/NSDictionary.h>
#include <Foundation/NSString.h>
#include <Foundation/NSArray.h>
#include <Foundation/NSValue.h>

#include "winlib/WIN32FontInfo.h"

int win32_font_weight(LONG tmWeight);
NSString *win32_font_family(NSString *fontName);

@interface WIN32FontInfo (Private)
- (BOOL) setupAttributes;
@end

@implementation WIN32FontInfo

- initWithFontName: (NSString*)name
	    matrix: (const float *)fmatrix
	screenFont: (BOOL)screenFont
{
  if (screenFont)
    {
      RELEASE(self);
      return nil;
    }

  [super init];
  ASSIGN(fontName, name);
  memcpy(matrix, fmatrix, sizeof(matrix));

  if (![self setupAttributes])
    {
      RELEASE(self);
      return nil;
    }

  return self;
}

- (void) dealloc
{
  if (hFont)
    {
      DeleteObject(hFont);
      hFont = NULL;
    }
  [super dealloc];
}

- (float) widthOfString: (NSString*)string
{
  SIZE size;
  HDC hdc;
  HFONT old;

  hdc = GetDC(NULL);
  old = SelectObject(hdc, hFont);
  GetTextExtentPoint32W(hdc,
    (const unichar*)[string cStringUsingEncoding: NSUnicodeStringEncoding],
    [string length],
    &size);
  SelectObject(hdc, old);
  ReleaseDC(NULL, hdc);

  return size.cx;
}

- (NSMultibyteGlyphPacking)glyphPacking
{
  return NSOneByteGlyphPacking;
}

- (NSSize) advancementForGlyph: (NSGlyph)glyph
{
  unichar u = (unichar)glyph;
  HDC hdc;
  float w;
  ABCFLOAT abc;
  HFONT old;

  hdc = GetDC(NULL);
  old = SelectObject(hdc, hFont);
  // FIXME ... currently a gnustep glyph is a unichar ... what if that changes.
  GetCharABCWidthsFloatW(hdc, u, u, &abc);
  SelectObject(hdc, old);
  ReleaseDC(NULL, hdc);

  //NSLog(@"Width for %d is %f or %f", glyph, w, (abc.abcfA + abc.abcfB + abc.abcfC));
  w = abc.abcfA + abc.abcfB + abc.abcfC;
  return NSMakeSize(w, 0);
}

- (NSRect) boundingRectForGlyph: (NSGlyph)glyph
{
  WORD c = (WORD)glyph;
  WORD windowsGlyph;
  HDC hdc;
  HFONT old;
  GLYPHMETRICS gm;
  NSRect rect;

  hdc = GetDC(NULL);
  old = SelectObject(hdc, hFont);
  // Convert from GNUstep glyph (unichar) to windows glyph.
  if (GetGlyphIndicesW(hdc, &c, 1, &windowsGlyph, 0) == GDI_ERROR)
    {
      SelectObject(hdc, old);
      ReleaseDC(NULL, hdc);
NSLog(@"No glyph for U%d", c);
      return NSMakeRect(0, 0, 0, 0);	// No such glyph
    }
  if (GDI_ERROR != GetGlyphOutlineW(hdc, windowsGlyph, 
				   GGO_METRICS, // || GGO_GLYPH_INDEX
				   &gm, 0, NULL, NULL))
    {
      rect = NSMakeRect(gm.gmptGlyphOrigin.x, 
			gm.gmptGlyphOrigin.y - gm.gmBlackBoxY,
			gm.gmCellIncX, gm.gmCellIncY);
    }
  else
    {
      rect  = NSMakeRect(0, 0, 0, 0);
    }

  SelectObject(hdc, old);
  ReleaseDC(NULL, hdc);

  return rect;
}

- (BOOL) glyphIsEncoded: (NSGlyph)glyph
{
  return YES;
}

- (NSGlyph) glyphWithName: (NSString*)glyphName
{
  return 0;
}

- (NSPoint) positionOfGlyph: (NSGlyph)curGlyph
	    precededByGlyph: (NSGlyph)prevGlyph
		  isNominal: (BOOL*)nominal
{
  return NSMakePoint(0, 0);
}

- (NSCharacterSet*) coveredCharacterSet
{
  if (coveredCharacterSet == nil)
    {
      NSMutableCharacterSet	*ms;
      unsigned	count; 
      GLYPHSET *gs = 0;
      HDC hdc;
      HFONT old;

      ms = [NSMutableCharacterSet new];
      hdc = GetDC(NULL);
      old = SelectObject(hdc, hFont);
      count = (unsigned)GetFontUnicodeRanges(hdc, 0);
      if (count > 0)
        {
          gs = (GLYPHSET*)objc_malloc(count);
          if ((unsigned)GetFontUnicodeRanges(hdc, gs) == count)
            {
              numberOfGlyphs = gs->cGlyphsSupported;
              if (gs->flAccel == 1 /* GS_8BIT_INDICES */)
                {
                  for (count = 0; count < gs->cRanges; count++)
                    {
                      NSRange	range;
                      
                      range.location = gs->ranges[count].wcLow & 0xff;
                      range.length = gs->ranges[count].cGlyphs;
                      [ms addCharactersInRange: range];
                    }
                }
              else
                {
                  for (count = 0; count < gs->cRanges; count++)
                    {
                      NSRange	range;
                      
                      range.location = gs->ranges[count].wcLow;
                      range.length = gs->ranges[count].cGlyphs;
                      [ms addCharactersInRange: range];
                    }
                }
            }
          objc_free(gs);
        }
      SelectObject(hdc, old);
      ReleaseDC(NULL, hdc);
      coveredCharacterSet = [ms copy];
      RELEASE(ms);
    }

  return coveredCharacterSet;
}

- (void) drawString: (NSString*)string
	       onDC: (HDC)hdc
		 at: (POINT)p
{
  HFONT old;

  old = SelectObject(hdc, hFont);
  TextOutW(hdc,
    p.x,
    p.y - ascender,
    (const unichar*)[string cStringUsingEncoding: NSUnicodeStringEncoding],
    [string length]); 
  SelectObject(hdc, old);
}

- (void) draw:(const char*)s length: (int)len 
	 onDC: (HDC)hdc at: (POINT)p
{
  HFONT old;

  old = SelectObject(hdc, hFont);
  TextOut(hdc, p.x, p.y - ascender, s, len); 
  SelectObject(hdc, old);
}

- (void) drawGlyphs: (const NSGlyph*)s
	     length: (int)len 
	       onDC: (HDC)hdc
		 at: (POINT)p
{
  WORD buf[len];
  HFONT old;
  int i;

  old = SelectObject(hdc, hFont);
  /*
   * For now, assume that a glyph is a unicode character and can be
   * stored in a windows WORD
   */
  for (i = 0; i < len; i++)
    {
      buf[i] = (WORD)s[i];
    }
  TextOutW(hdc, p.x, p.y - ascender, buf, len); 
  SelectObject(hdc, old);
}

- (unsigned) numberOfglyphs
{
  if (coveredCharacterSet == nil)
    {
      [self coveredCharacterSet];
    }
  return numberOfGlyphs;
}

@end

@implementation WIN32FontInfo (Private)

- (BOOL) setupAttributes
{
  HDC hdc;
  TEXTMETRICW metric;
  HFONT old;
  LOGFONTW logfont;
  NSRange range;

  //NSLog(@"Creating Font %@ of size %f", fontName, matrix[0]);
  ASSIGN(familyName, win32_font_family(fontName));
  memset(&logfont, 0, sizeof(LOGFONT));
  hdc = GetDC(NULL);
  // FIXME This hack gets the font size about right, but what is the real solution?
  logfont.lfHeight = (int)(matrix[0] * 4 / 3);
  //logfont.lfHeight = -MulDiv(matrix[0], GetDeviceCaps(hdc, LOGPIXELSY), 72);

  range = [fontName rangeOfString: @"Bold"];
  if (range.length)
    logfont.lfWeight = FW_BOLD;

  range = [fontName rangeOfString: @"Italic"];
  if (range.length)
    logfont.lfItalic = 1; 

  logfont.lfQuality = ANTIALIASED_QUALITY;
  wcsncpy(logfont.lfFaceName,
    (const unichar*)[familyName cStringUsingEncoding: NSUnicodeStringEncoding],
    LF_FACESIZE);
  hFont = CreateFontIndirectW(&logfont);
  if (!hFont)
    {
      NSLog(@"Could not create font %@", fontName);
      ReleaseDC(NULL, hdc);
      return NO;
    }

  old = SelectObject(hdc, hFont);
  GetTextMetricsW(hdc, &metric);
  SelectObject(hdc, old);
  ReleaseDC(NULL, hdc);

  // Fill the ivars
  isFixedPitch = TMPF_FIXED_PITCH & metric.tmPitchAndFamily;
  isBaseFont = NO;
  ascender = metric.tmAscent;
  //NSLog(@"Resulted in height %d and ascent %d", metric.tmHeight, metric.tmAscent);
  descender = -metric.tmDescent;
  /* TODO */
  xHeight = ascender * 0.5;
  maximumAdvancement = NSMakeSize((float)metric.tmMaxCharWidth, 0.0);

  fontBBox = NSMakeRect((float)(0),
			(float)(0 - metric.tmAscent),
			(float)metric.tmMaxCharWidth,
			(float)metric.tmHeight);

  weight = win32_font_weight(metric.tmWeight);

  traits = 0;
  if (weight >= 9)
    traits |= NSBoldFontMask;
  else
    traits |= NSUnboldFontMask;

  if (metric.tmItalic)
    traits |= NSItalicFontMask;
  else
    traits |= NSUnitalicFontMask;

  // FIXME Should come from metric.tmCharSet
  mostCompatibleStringEncoding = NSISOLatin1StringEncoding;

  return YES;
}
    
@end