1 files changed, 282 insertions, 0 deletions
diff --git a/WebCore/platform/graphics/BitmapImage.cpp b/WebCore/platform/graphics/BitmapImage.cpp
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+++ b/WebCore/platform/graphics/BitmapImage.cpp
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+/*
+ * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
+ * Copyright (C) 2004, 2005, 2006, 2008 Apple 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 "BitmapImage.h"
+
+#include "FloatRect.h"
+#include "ImageObserver.h"
+#include "IntRect.h"
+#include "PlatformString.h"
+#include "Timer.h"
+#include <wtf/Vector.h>
+#include "MIMETypeRegistry.h"
+
+namespace WebCore {
+
+// Animated images >5MB are considered large enough that we'll only hang on to
+// one frame at a time.
+const unsigned cLargeAnimationCutoff = 5242880;
+
+BitmapImage::BitmapImage(ImageObserver* observer)
+    : Image(observer)
+    , m_currentFrame(0)
+    , m_frames(0)
+    , m_frameTimer(0)
+    , m_repetitionCount(0)
+    , m_repetitionsComplete(0)
+    , m_isSolidColor(false)
+    , m_animatingImageType(true)
+    , m_animationFinished(false)
+    , m_allDataReceived(false)
+    , m_haveSize(false)
+    , m_sizeAvailable(false)
+    , m_decodedSize(0)
+{
+    initPlatformData();
+}
+
+BitmapImage::~BitmapImage()
+{
+    invalidatePlatformData();
+    stopAnimation();
+}
+
+void BitmapImage::destroyDecodedData(bool incremental)
+{
+    // Destroy the cached images and release them.
+    if (m_frames.size()) {
+        int sizeChange = 0;
+        int frameSize = m_size.width() * m_size.height() * 4;
+        for (unsigned i = incremental ? m_frames.size() - 1 : 0; i < m_frames.size(); i++) {
+            if (m_frames[i].m_frame) {
+                sizeChange -= frameSize;
+                m_frames[i].clear();
+            }
+        }
+
+        // We just always invalidate our platform data, even in the incremental case.
+        // This could be better, but it's not a big deal.
+        m_isSolidColor = false;
+        invalidatePlatformData();
+        
+        if (sizeChange) {
+            m_decodedSize += sizeChange;
+            if (imageObserver())
+                imageObserver()->decodedSizeChanged(this, sizeChange);
+        }
+        
+        if (!incremental) {
+            // Reset the image source, since Image I/O has an underlying cache that it uses
+            // while animating that it seems to never clear.
+            m_source.clear();
+            m_source.setData(m_data.get(), m_allDataReceived);
+        }
+    }
+}
+
+void BitmapImage::cacheFrame(size_t index)
+{
+    size_t numFrames = frameCount();
+    ASSERT(m_decodedSize == 0 || numFrames > 1);
+    
+    if (!m_frames.size() && shouldAnimate()) {            
+        // Snag the repetition count.
+        m_repetitionCount = m_source.repetitionCount();
+        if (m_repetitionCount == cAnimationNone)
+            m_animatingImageType = false;
+    }
+    
+    if (m_frames.size() < numFrames)
+        m_frames.grow(numFrames);
+
+    m_frames[index].m_frame = m_source.createFrameAtIndex(index);
+    if (numFrames == 1 && m_frames[index].m_frame)
+        checkForSolidColor();
+
+    if (shouldAnimate())
+        m_frames[index].m_duration = m_source.frameDurationAtIndex(index);
+    m_frames[index].m_hasAlpha = m_source.frameHasAlphaAtIndex(index);
+    
+    int sizeChange = m_frames[index].m_frame ? m_size.width() * m_size.height() * 4 : 0;
+    if (sizeChange) {
+        m_decodedSize += sizeChange;
+        if (imageObserver())
+            imageObserver()->decodedSizeChanged(this, sizeChange);
+    }
+}
+
+IntSize BitmapImage::size() const
+{
+    if (m_sizeAvailable && !m_haveSize) {
+        m_size = m_source.size();
+        m_haveSize = true;
+    }
+    return m_size;
+}
+
+bool BitmapImage::dataChanged(bool allDataReceived)
+{
+    destroyDecodedData(true);
+    
+    // Feed all the data we've seen so far to the image decoder.
+    m_allDataReceived = allDataReceived;
+    m_source.setData(m_data.get(), allDataReceived);
+    
+    // Image properties will not be available until the first frame of the file
+    // reaches kCGImageStatusIncomplete.
+    return isSizeAvailable();
+}
+
+size_t BitmapImage::frameCount()
+{
+    return m_source.frameCount();
+}
+
+bool BitmapImage::isSizeAvailable()
+{
+    if (m_sizeAvailable)
+        return true;
+
+    m_sizeAvailable = m_source.isSizeAvailable();
+
+    return m_sizeAvailable;
+}
+
+NativeImagePtr BitmapImage::frameAtIndex(size_t index)
+{
+    if (index >= frameCount())
+        return 0;
+
+    if (index >= m_frames.size() || !m_frames[index].m_frame)
+        cacheFrame(index);
+
+    return m_frames[index].m_frame;
+}
+
+float BitmapImage::frameDurationAtIndex(size_t index)
+{
+    if (index >= frameCount())
+        return 0;
+
+    if (index >= m_frames.size() || !m_frames[index].m_frame)
+        cacheFrame(index);
+
+    return m_frames[index].m_duration;
+}
+
+bool BitmapImage::frameHasAlphaAtIndex(size_t index)
+{
+    if (index >= frameCount())
+        return 0;
+
+    if (index >= m_frames.size() || !m_frames[index].m_frame)
+        cacheFrame(index);
+
+    return m_frames[index].m_hasAlpha;
+}
+
+bool BitmapImage::shouldAnimate()
+{
+    return (m_animatingImageType && !m_animationFinished && imageObserver());
+}
+
+void BitmapImage::startAnimation()
+{
+    if (m_frameTimer || !shouldAnimate() || frameCount() <= 1)
+        return;
+
+    // Don't advance the animation until the current frame has completely loaded.
+    if (!m_source.frameIsCompleteAtIndex(m_currentFrame))
+        return;
+
+    m_frameTimer = new Timer<BitmapImage>(this, &BitmapImage::advanceAnimation);
+    m_frameTimer->startOneShot(frameDurationAtIndex(m_currentFrame));
+}
+
+void BitmapImage::stopAnimation()
+{
+    // This timer is used to animate all occurrences of this image.  Don't invalidate
+    // the timer unless all renderers have stopped drawing.
+    delete m_frameTimer;
+    m_frameTimer = 0;
+}
+
+void BitmapImage::resetAnimation()
+{
+    stopAnimation();
+    m_currentFrame = 0;
+    m_repetitionsComplete = 0;
+    m_animationFinished = false;
+    int frameSize = m_size.width() * m_size.height() * 4;
+    
+    // For extremely large animations, when the animation is reset, we just throw everything away.
+    if (frameCount() * frameSize > cLargeAnimationCutoff)
+        destroyDecodedData();
+}
+
+void BitmapImage::advanceAnimation(Timer<BitmapImage>* timer)
+{
+    // Stop the animation.
+    stopAnimation();
+    
+    // See if anyone is still paying attention to this animation.  If not, we don't
+    // advance and will remain suspended at the current frame until the animation is resumed.
+    if (imageObserver()->shouldPauseAnimation(this))
+        return;
+
+    m_currentFrame++;
+    if (m_currentFrame >= frameCount()) {
+        m_repetitionsComplete += 1;
+        if (m_repetitionCount && m_repetitionsComplete >= m_repetitionCount) {
+            m_animationFinished = true;
+            m_currentFrame--;
+            return;
+        }
+        m_currentFrame = 0;
+    }
+
+    // Notify our observer that the animation has advanced.
+    imageObserver()->animationAdvanced(this);
+
+    // For large animated images, go ahead and throw away frames as we go to save
+    // footprint.
+    int frameSize = m_size.width() * m_size.height() * 4;
+    if (frameCount() * frameSize > cLargeAnimationCutoff) {
+        // Destroy all of our frames and just redecode every time.
+        destroyDecodedData();
+
+        // Go ahead and decode the next frame.
+        frameAtIndex(m_currentFrame);
+    }
+    
+    // We do not advance the animation explicitly.  We rely on a subsequent draw of the image
+    // to force a request for the next frame via startAnimation().  This allows images that move offscreen while
+    // scrolling to stop animating (thus saving memory from additional decoded frames and
+    // CPU time spent doing the decoding).
+}
+
+}