1 /*

     2  * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.

     3  *               2006 Rob Buis <buis@kde.org>

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  * 1. Redistributions of source code must retain the above copyright

     9  *    notice, this list of conditions and the following disclaimer.

    10  * 2. Redistributions in binary form must reproduce the above copyright

    11  *    notice, this list of conditions and the following disclaimer in the

    12  *    documentation and/or other materials provided with the distribution.

    13  *

    14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    25  */

    26 

    27 

    28 #include "config.h"

    29 #if ENABLE(SVG)

    30 #include <ApplicationServices/ApplicationServices.h>

    31 #include "CgSupport.h"

    32 

    33 #include "FloatConversion.h"

    34 #include "GraphicsContext.h"

    35 #include "KCanvasRenderingStyle.h"

    36 #include "RenderStyle.h"

    37 #include "SVGRenderStyle.h"

    38 #include <wtf/Assertions.h>

    39 

    40 namespace WebCore {

    41 

    42 CFStringRef CFStringFromCGAffineTransform(CGAffineTransform t)

    43 {

    44     return CFStringCreateWithFormat(0, 0, CFSTR("a: %f b: %f c: %f d: %f tx: %f ty: %f"), t.a, t.b, t.c, t.d, t.tx, t.ty);

    45 }

    46 

    47 CGAffineTransform CGAffineTransformMakeMapBetweenRects(CGRect source, CGRect dest)

    48 {

    49     CGAffineTransform transform = CGAffineTransformMakeTranslation(dest.origin.x - source.origin.x, dest.origin.y - source.origin.y);

    50     transform = CGAffineTransformScale(transform, dest.size.width/source.size.width, dest.size.height/source.size.height);

    51     return transform;

    52 }

    53 

    54 void applyStrokeStyleToContext(CGContextRef context, RenderStyle* style, const RenderObject* object)

    55 {

    56     /* Shouldn't all these be in the stroke painter? */

    57     CGContextSetLineWidth(context, narrowPrecisionToCGFloat(KSVGPainterFactory::cssPrimitiveToLength(object, style->svgStyle()->strokeWidth(), 1.0)));

    58 

    59     CGContextSetLineCap(context, CGLineCapFromKC(style->svgStyle()->capStyle()));

    60     CGContextSetLineJoin(context, CGLineJoinFromKC(style->svgStyle()->joinStyle()));

    61 

    62     CGContextSetMiterLimit(context, style->svgStyle()->strokeMiterLimit());

    63 

    64     const KCDashArray& dashes = KSVGPainterFactory::dashArrayFromRenderingStyle(style);

    65     double dashOffset = KSVGPainterFactory::cssPrimitiveToLength(object, style->svgStyle()->strokeDashOffset(), 0.0);

    66 

    67     CGContextSetLineDash(context, narrowPrecisionToCGFloat(dashOffset), dashes.data(), dashes.size());

    68 }

    69 

    70 CGContextRef scratchContext()

    71 {

    72     static CGContextRef scratch = 0;

    73     if (!scratch) {

    74         CFMutableDataRef empty = CFDataCreateMutable(NULL, 0);

    75         CGDataConsumerRef consumer = CGDataConsumerCreateWithCFData(empty);

    76         scratch = CGPDFContextCreate(consumer, NULL, NULL);

    77         CGDataConsumerRelease(consumer);

    78         CFRelease(empty);

    79 

    80         CGFloat black[4] = {0, 0, 0, 1};

    81         CGContextSetFillColor(scratch, black);

    82         CGContextSetStrokeColor(scratch, black);

    83      }

    84     return scratch;

    85 }

    86 

    87 FloatRect strokeBoundingBox(const Path& path, RenderStyle* style, const RenderObject* object)

    88  {

    89     // the bbox might grow if the path is stroked.

    90     // and CGPathGetBoundingBox doesn't support that, so we'll have

    91     // to make an alternative call...

    92  

    93     // FIXME: since this is mainly used to decide what to repaint,

    94     // perhaps it would be sufficien to just outset the fill bbox by

    95     // the stroke width - that should be way cheaper and simpler than

    96     // what we do here.

    97  

    98     CGPathRef cgPath = path.platformPath();

    99 

   100     CGContextRef context = scratchContext();

   101     CGContextSaveGState(context);

   102 

   103     CGContextBeginPath(context);

   104     CGContextAddPath(context, cgPath);

   105     applyStrokeStyleToContext(context, style, object);

   106     CGContextReplacePathWithStrokedPath(context);

   107     CGRect box = CGContextGetPathBoundingBox(context);

   108         

   109     CGContextRestoreGState(context);

   110 

   111     return FloatRect(box);

   112 }

   113 

   114 }

   115 

   116 #endif // ENABLE(SVG)

   117