external/webkit r30707

1 files changed, 197 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/Image.cpp b/WebCore/platform/graphics/Image.cpp
new file mode 100644
index 0000000..8bf7c68
--- /dev/null
+++ b/WebCore/platform/graphics/Image.cpp
@@ -0,0 +1,197 @@
+/*
+ * 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 "GraphicsContext.h"
+#include "IntRect.h"
+#include "MIMETypeRegistry.h"
+
+#include <math.h>
+
+#if PLATFORM(CG)
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
+namespace WebCore {
+
+Image::Image(ImageObserver* observer)
+    : m_imageObserver(observer)
+{
+}
+
+Image::~Image()
+{
+}
+
+bool Image::supportsType(const String& type)
+{
+    return MIMETypeRegistry::isSupportedImageResourceMIMEType(type); 
+} 
+
+bool Image::isNull() const
+{
+    return size().isEmpty();
+}
+
+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);
+}
+
+IntRect Image::rect() const
+{
+    return IntRect(IntPoint(), size());
+}
+
+int Image::width() const
+{
+    return size().width();
+}
+
+int Image::height() const
+{
+    return size().height();
+}
+
+void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, CompositeOperator op)
+{
+    if (color.alpha() <= 0)
+        return;
+    
+    ctxt->save();
+    ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
+    ctxt->fillRect(dstRect, color);
+    ctxt->restore();
+}
+
+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, CompositeOperator op)
+{    
+    if (!nativeImageForCurrentFrame())
+        return;
+    
+    if (mayFillWithSolidColor()) {
+        fillWithSolidColor(ctxt, destRect, solidColor(), 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());
+    AffineTransform patternTransform = AffineTransform().scale(scale.width(), scale.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, op);
+        return;
+    }
+
+    FloatRect tileRect(FloatPoint(), intrinsicTileSize);    
+    drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), 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, CompositeOperator op)
+{    
+    if (!nativeImageForCurrentFrame())
+        return;
+
+    if (mayFillWithSolidColor()) {
+        fillWithSolidColor(ctxt, dstRect, solidColor(), 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().scale(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, op, dstRect);
+
+    startAnimation();
+}
+
+
+}