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      1 /*
      2  * Copyright (C) 2011 Apple Inc.
      3  * Copyright (C) 2010 Sencha, Inc.
      4  * Copyright (C) 2010 Igalia S.L.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     20  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     21  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     24  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef ShadowBlur_h
     30 #define ShadowBlur_h
     31 
     32 #include "Color.h"
     33 #include "ColorSpace.h"
     34 #include "FloatRect.h"
     35 #include "RoundedIntRect.h"
     36 #include <wtf/Noncopyable.h>
     37 
     38 namespace WebCore {
     39 
     40 class AffineTransform;
     41 class GraphicsContext;
     42 class ImageBuffer;
     43 
     44 class ShadowBlur {
     45     WTF_MAKE_NONCOPYABLE(ShadowBlur);
     46 public:
     47     ShadowBlur(float radius, const FloatSize& offset, const Color&, ColorSpace);
     48 
     49     void setShadowsIgnoreTransforms(bool ignoreTransforms) { m_shadowsIgnoreTransforms = ignoreTransforms; }
     50     bool shadowsIgnoreTransforms() const { return m_shadowsIgnoreTransforms; }
     51 
     52     void drawRectShadow(GraphicsContext*, const FloatRect&, const RoundedIntRect::Radii&);
     53     void drawInsetShadow(GraphicsContext*, const FloatRect&, const FloatRect& holeRect, const RoundedIntRect::Radii& holeRadii);
     54 
     55 private:
     56     void drawShadowBuffer(GraphicsContext*);
     57 
     58     void adjustBlurRadius(GraphicsContext*);
     59     void blurLayerImage(unsigned char*, const IntSize&, int stride);
     60 
     61     enum ShadowDirection {
     62         OuterShadow,
     63         InnerShadow
     64     };
     65 
     66     IntRect calculateLayerBoundingRect(GraphicsContext*, const FloatRect& layerArea, const IntRect& clipRect);
     67     IntSize templateSize(const RoundedIntRect::Radii&) const;
     68 
     69     void drawRectShadowWithoutTiling(GraphicsContext*, const FloatRect&, const RoundedIntRect::Radii&, const IntRect& layerRect);
     70     void drawRectShadowWithTiling(GraphicsContext*, const FloatRect&, const RoundedIntRect::Radii&, const IntSize& shadowTemplateSize);
     71 
     72     void drawInsetShadowWithoutTiling(GraphicsContext*, const FloatRect&, const FloatRect& holeRect, const RoundedIntRect::Radii&, const IntRect& layerRect);
     73     void drawInsetShadowWithTiling(GraphicsContext*, const FloatRect&, const FloatRect& holeRect, const RoundedIntRect::Radii&, const IntSize& shadowTemplateSize);
     74 
     75     void drawLayerPieces(GraphicsContext*, const FloatRect& shadowBounds, const RoundedIntRect::Radii&, float roundedRadius, const IntSize& templateSize, ShadowDirection);
     76 
     77     void blurShadowBuffer(const IntSize& templateSize);
     78     void blurAndColorShadowBuffer(const IntSize& templateSize);
     79 
     80     enum ShadowType {
     81         NoShadow,
     82         SolidShadow,
     83         BlurShadow
     84     };
     85 
     86     ShadowType m_type;
     87 
     88     Color m_color;
     89     ColorSpace m_colorSpace;
     90     float m_blurRadius;
     91     FloatSize m_offset;
     92 
     93     ImageBuffer* m_layerImage; // Buffer to where the temporary shadow will be drawn to.
     94 
     95     FloatRect m_sourceRect; // Sub-rect of m_layerImage that contains the shadow pixels.
     96     FloatPoint m_layerOrigin; // Top-left corner of the (possibly clipped) bounding rect to draw the shadow to.
     97     FloatSize m_layerSize; // Size of m_layerImage pixels that need blurring.
     98     FloatSize m_layerContextTranslation; // Translation to apply to m_layerContext for the shadow to be correctly clipped.
     99 
    100     bool m_shadowsIgnoreTransforms;
    101 };
    102 
    103 } // namespace WebCore
    104 
    105 #endif // ShadowBlur_h
    106