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/*
* Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2004, 2005, 2006 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Image.h"
#include "AffineTransform.h"
#include "BitmapImage.h"
#include "GraphicsContext.h"
#include "IntRect.h"
#include "MIMETypeRegistry.h"
#include "SharedBuffer.h"
#include <math.h>
#include <wtf/StdLibExtras.h>
#if USE(CG)
#include <CoreFoundation/CoreFoundation.h>
#endif
namespace WebCore {
Image::Image(ImageObserver* observer)
: m_imageObserver(observer)
{
}
Image::~Image()
{
}
Image* Image::nullImage()
{
ASSERT(isMainThread());
DEFINE_STATIC_LOCAL(RefPtr<Image>, nullImage, (BitmapImage::create()));;
return nullImage.get();
}
bool Image::supportsType(const String& type)
{
return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
}
bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
{
m_data = data;
if (!m_data.get())
return true;
int length = m_data->size();
if (!length)
return true;
return dataChanged(allDataReceived);
}
void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op)
{
if (color.alpha() <= 0)
return;
CompositeOperator previousOperator = ctxt->compositeOperation();
ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
ctxt->fillRect(dstRect, color, styleColorSpace);
ctxt->setCompositeOperation(previousOperator);
}
static inline FloatSize calculatePatternScale(const FloatRect& dstRect, const FloatRect& srcRect, Image::TileRule hRule, Image::TileRule vRule)
{
float scaleX = 1.0f, scaleY = 1.0f;
if (hRule == Image::StretchTile)
scaleX = dstRect.width() / srcRect.width();
if (vRule == Image::StretchTile)
scaleY = dstRect.height() / srcRect.height();
if (hRule == Image::RepeatTile)
scaleX = scaleY;
if (vRule == Image::RepeatTile)
scaleY = scaleX;
return FloatSize(scaleX, scaleY);
}
void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op)
{
if (mayFillWithSolidColor()) {
fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op);
return;
}
FloatSize intrinsicTileSize = size();
if (hasRelativeWidth())
intrinsicTileSize.setWidth(scaledTileSize.width());
if (hasRelativeHeight())
intrinsicTileSize.setHeight(scaledTileSize.height());
FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
scaledTileSize.height() / intrinsicTileSize.height());
FloatRect oneTileRect;
oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), scaledTileSize.width()) - scaledTileSize.width(), scaledTileSize.width()));
oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), scaledTileSize.height()) - scaledTileSize.height(), scaledTileSize.height()));
oneTileRect.setSize(scaledTileSize);
// Check and see if a single draw of the image can cover the entire area we are supposed to tile.
if (oneTileRect.contains(destRect)) {
FloatRect visibleSrcRect;
visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
visibleSrcRect.setWidth(destRect.width() / scale.width());
visibleSrcRect.setHeight(destRect.height() / scale.height());
draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op);
return;
}
AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
FloatRect tileRect(FloatPoint(), intrinsicTileSize);
drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect);
startAnimation();
}
// FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things.
void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op)
{
if (mayFillWithSolidColor()) {
fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op);
return;
}
// FIXME: We do not support 'round' yet. For now just map it to 'repeat'.
if (hRule == RoundTile)
hRule = RepeatTile;
if (vRule == RoundTile)
vRule = RepeatTile;
FloatSize scale = calculatePatternScale(dstRect, srcRect, hRule, vRule);
AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
// We want to construct the phase such that the pattern is centered (when stretch is not
// set for a particular rule).
float hPhase = scale.width() * srcRect.x();
float vPhase = scale.height() * srcRect.y();
if (hRule == Image::RepeatTile)
hPhase -= fmodf(dstRect.width(), scale.width() * srcRect.width()) / 2.0f;
if (vRule == Image::RepeatTile)
vPhase -= fmodf(dstRect.height(), scale.height() * srcRect.height()) / 2.0f;
FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect);
startAnimation();
}
}
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