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      1 /*
      2  * Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com)
      3  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
      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 #include "config.h"
     28 #include "Image.h"
     29 
     30 #include "AffineTransform.h"
     31 #include "BitmapImage.h"
     32 #include "GraphicsContext.h"
     33 #include "IntRect.h"
     34 #include "MIMETypeRegistry.h"
     35 #include <wtf/StdLibExtras.h>
     36 
     37 #include <math.h>
     38 
     39 #if PLATFORM(CG)
     40 #include <CoreFoundation/CoreFoundation.h>
     41 #endif
     42 
     43 namespace WebCore {
     44 
     45 Image::Image(ImageObserver* observer)
     46     : m_imageObserver(observer)
     47 {
     48 }
     49 
     50 Image::~Image()
     51 {
     52 }
     53 
     54 Image* Image::nullImage()
     55 {
     56     DEFINE_STATIC_LOCAL(RefPtr<Image>, nullImage, (BitmapImage::create()));;
     57     return nullImage.get();
     58 }
     59 
     60 bool Image::supportsType(const String& type)
     61 {
     62     return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
     63 }
     64 
     65 bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
     66 {
     67     m_data = data;
     68     if (!m_data.get())
     69         return true;
     70 
     71     int length = m_data->size();
     72     if (!length)
     73         return true;
     74 
     75     return dataChanged(allDataReceived);
     76 }
     77 
     78 void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op)
     79 {
     80     if (color.alpha() <= 0)
     81         return;
     82 
     83     ctxt->save();
     84     ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
     85     ctxt->fillRect(dstRect, color, styleColorSpace);
     86     ctxt->restore();
     87 }
     88 
     89 static inline FloatSize calculatePatternScale(const FloatRect& dstRect, const FloatRect& srcRect, Image::TileRule hRule, Image::TileRule vRule)
     90 {
     91     float scaleX = 1.0f, scaleY = 1.0f;
     92 
     93     if (hRule == Image::StretchTile)
     94         scaleX = dstRect.width() / srcRect.width();
     95     if (vRule == Image::StretchTile)
     96         scaleY = dstRect.height() / srcRect.height();
     97 
     98     if (hRule == Image::RepeatTile)
     99         scaleX = scaleY;
    100     if (vRule == Image::RepeatTile)
    101         scaleY = scaleX;
    102 
    103     return FloatSize(scaleX, scaleY);
    104 }
    105 
    106 
    107 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op)
    108 {
    109     if (mayFillWithSolidColor()) {
    110         fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op);
    111         return;
    112     }
    113 
    114     FloatSize intrinsicTileSize = size();
    115     if (hasRelativeWidth())
    116         intrinsicTileSize.setWidth(scaledTileSize.width());
    117     if (hasRelativeHeight())
    118         intrinsicTileSize.setHeight(scaledTileSize.height());
    119 
    120     FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
    121                     scaledTileSize.height() / intrinsicTileSize.height());
    122 
    123     FloatRect oneTileRect;
    124     oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), scaledTileSize.width()) - scaledTileSize.width(), scaledTileSize.width()));
    125     oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), scaledTileSize.height()) - scaledTileSize.height(), scaledTileSize.height()));
    126     oneTileRect.setSize(scaledTileSize);
    127 
    128     // Check and see if a single draw of the image can cover the entire area we are supposed to tile.
    129     if (oneTileRect.contains(destRect)) {
    130         FloatRect visibleSrcRect;
    131         visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
    132         visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
    133         visibleSrcRect.setWidth(destRect.width() / scale.width());
    134         visibleSrcRect.setHeight(destRect.height() / scale.height());
    135         draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op);
    136         return;
    137     }
    138 
    139     AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
    140     FloatRect tileRect(FloatPoint(), intrinsicTileSize);
    141     drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect);
    142 
    143     startAnimation();
    144 }
    145 
    146 // FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things.
    147 void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op)
    148 {
    149     if (mayFillWithSolidColor()) {
    150         fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op);
    151         return;
    152     }
    153 
    154     // FIXME: We do not support 'round' yet.  For now just map it to 'repeat'.
    155     if (hRule == RoundTile)
    156         hRule = RepeatTile;
    157     if (vRule == RoundTile)
    158         vRule = RepeatTile;
    159 
    160     FloatSize scale = calculatePatternScale(dstRect, srcRect, hRule, vRule);
    161     AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
    162 
    163     // We want to construct the phase such that the pattern is centered (when stretch is not
    164     // set for a particular rule).
    165     float hPhase = scale.width() * srcRect.x();
    166     float vPhase = scale.height() * srcRect.y();
    167     if (hRule == Image::RepeatTile)
    168         hPhase -= fmodf(dstRect.width(), scale.width() * srcRect.width()) / 2.0f;
    169     if (vRule == Image::RepeatTile)
    170         vPhase -= fmodf(dstRect.height(), scale.height() * srcRect.height()) / 2.0f;
    171     FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
    172 
    173     drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect);
    174 
    175     startAnimation();
    176 }
    177 
    178 
    179 }
    180