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      1 /*
      2  * Copyright (C) 2000 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2000 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2000 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  *
     22  */
     23 
     24 #include "config.h"
     25 #include "core/rendering/style/StyleGeneratedImage.h"
     26 
     27 #include "core/css/CSSImageGeneratorValue.h"
     28 #include "core/css/resolver/StyleResolver.h"
     29 #include "core/rendering/RenderObject.h"
     30 
     31 namespace WebCore {
     32 
     33 StyleGeneratedImage::StyleGeneratedImage(PassRefPtrWillBeRawPtr<CSSImageGeneratorValue> value)
     34     : m_imageGeneratorValue(value)
     35     , m_fixedSize(m_imageGeneratorValue->isFixedSize())
     36 {
     37     m_isGeneratedImage = true;
     38 }
     39 
     40 PassRefPtrWillBeRawPtr<CSSValue> StyleGeneratedImage::cssValue() const
     41 {
     42     return m_imageGeneratorValue.get();
     43 }
     44 
     45 LayoutSize StyleGeneratedImage::imageSize(const RenderObject* renderer, float multiplier) const
     46 {
     47     if (m_fixedSize) {
     48         IntSize fixedSize = m_imageGeneratorValue->fixedSize(renderer);
     49         if (multiplier == 1.0f)
     50             return fixedSize;
     51 
     52         LayoutUnit width = fixedSize.width() * multiplier;
     53         LayoutUnit height = fixedSize.height() * multiplier;
     54 
     55         // Don't let images that have a width/height >= 1 shrink below 1 when zoomed.
     56         if (fixedSize.width() > 0)
     57             width = max<LayoutUnit>(1, width);
     58 
     59         if (fixedSize.height() > 0)
     60             height = max<LayoutUnit>(1, height);
     61 
     62         return LayoutSize(width, height);
     63     }
     64 
     65     return m_containerSize;
     66 }
     67 
     68 void StyleGeneratedImage::computeIntrinsicDimensions(const RenderObject* renderer, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
     69 {
     70     // At a zoom level of 1 the image is guaranteed to have an integer size.
     71     IntSize size = flooredIntSize(imageSize(renderer, 1));
     72     intrinsicWidth = Length(size.width(), Fixed);
     73     intrinsicHeight = Length(size.height(), Fixed);
     74     intrinsicRatio = size;
     75 }
     76 
     77 void StyleGeneratedImage::addClient(RenderObject* renderer)
     78 {
     79     m_imageGeneratorValue->addClient(renderer, IntSize());
     80 }
     81 
     82 void StyleGeneratedImage::removeClient(RenderObject* renderer)
     83 {
     84     m_imageGeneratorValue->removeClient(renderer);
     85 }
     86 
     87 PassRefPtr<Image> StyleGeneratedImage::image(RenderObject* renderer, const IntSize& size) const
     88 {
     89     return m_imageGeneratorValue->image(renderer, size);
     90 }
     91 
     92 bool StyleGeneratedImage::knownToBeOpaque(const RenderObject* renderer) const
     93 {
     94     return m_imageGeneratorValue->knownToBeOpaque(renderer);
     95 }
     96 
     97 }
     98