Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 187 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/ImageSource.cpp b/Source/WebCore/platform/graphics/ImageSource.cpp
new file mode 100644
index 0000000..92553c5
--- /dev/null
+++ b/Source/WebCore/platform/graphics/ImageSource.cpp
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2007 Alp Toker <alp.toker@collabora.co.uk>
+ * Copyright (C) 2008, Google Inc. All rights reserved.
+ * Copyright (C) 2007-2009 Torch Mobile, Inc
+ *
+ * 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 "ImageSource.h"
+
+#if PLATFORM(QT)
+#include "ImageDecoderQt.h"
+#else
+#include "ImageDecoder.h"
+#endif
+
+namespace WebCore {
+
+#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
+unsigned ImageSource::s_maxPixelsPerDecodedImage = 1024 * 1024;
+#endif
+
+ImageSource::ImageSource(ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption)
+    : m_decoder(0)
+    , m_alphaOption(alphaOption)
+    , m_gammaAndColorProfileOption(gammaAndColorProfileOption)
+{
+}
+
+ImageSource::~ImageSource()
+{
+    clear(true);
+}
+
+void ImageSource::clear(bool destroyAll, size_t clearBeforeFrame, SharedBuffer* data, bool allDataReceived)
+{
+    if (!destroyAll) {
+        if (m_decoder)
+            m_decoder->clearFrameBufferCache(clearBeforeFrame);
+        return;
+    }
+
+    delete m_decoder;
+    m_decoder = 0;
+    if (data)
+        setData(data, allDataReceived);
+}
+
+bool ImageSource::initialized() const
+{
+    return m_decoder;
+}
+
+void ImageSource::setData(SharedBuffer* data, bool allDataReceived)
+{
+    // Make the decoder by sniffing the bytes.
+    // This method will examine the data and instantiate an instance of the appropriate decoder plugin.
+    // If insufficient bytes are available to determine the image type, no decoder plugin will be
+    // made.
+    if (!m_decoder) {
+        m_decoder = static_cast<NativeImageSourcePtr>(ImageDecoder::create(*data, m_alphaOption, m_gammaAndColorProfileOption));
+#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
+        if (m_decoder && s_maxPixelsPerDecodedImage)
+            m_decoder->setMaxNumPixels(s_maxPixelsPerDecodedImage);
+#endif
+    }
+
+    if (m_decoder)
+        m_decoder->setData(data, allDataReceived);
+}
+
+String ImageSource::filenameExtension() const
+{
+    return m_decoder ? m_decoder->filenameExtension() : String();
+}
+
+bool ImageSource::isSizeAvailable()
+{
+    return m_decoder && m_decoder->isSizeAvailable();
+}
+
+IntSize ImageSource::size() const
+{
+    return m_decoder ? m_decoder->size() : IntSize();
+}
+
+IntSize ImageSource::frameSizeAtIndex(size_t index) const
+{
+    return m_decoder ? m_decoder->frameSizeAtIndex(index) : IntSize();
+}
+
+bool ImageSource::getHotSpot(IntPoint&) const
+{
+    return false;
+}
+
+int ImageSource::repetitionCount()
+{
+    return m_decoder ? m_decoder->repetitionCount() : cAnimationNone;
+}
+
+size_t ImageSource::frameCount() const
+{
+    return m_decoder ? m_decoder->frameCount() : 0;
+}
+
+NativeImagePtr ImageSource::createFrameAtIndex(size_t index)
+{
+    if (!m_decoder)
+        return 0;
+
+    RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
+    if (!buffer || buffer->status() == RGBA32Buffer::FrameEmpty)
+        return 0;
+
+    // Zero-height images can cause problems for some ports.  If we have an
+    // empty image dimension, just bail.
+    if (size().isEmpty())
+        return 0;
+
+    // Return the buffer contents as a native image.  For some ports, the data
+    // is already in a native container, and this just increments its refcount.
+    return buffer->asNewNativeImage();
+}
+
+float ImageSource::frameDurationAtIndex(size_t index)
+{
+    if (!m_decoder)
+        return 0;
+
+    RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
+    if (!buffer || buffer->status() == RGBA32Buffer::FrameEmpty)
+        return 0;
+
+    // Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
+    // We follow Firefox's behavior and use a duration of 100 ms for any frames that specify
+    // a duration of <= 10 ms. See <rdar://problem/7689300> and <http://webkit.org/b/36082>
+    // for more information.
+    const float duration = buffer->duration() / 1000.0f;
+    if (duration < 0.011f)
+        return 0.100f;
+    return duration;
+}
+
+bool ImageSource::frameHasAlphaAtIndex(size_t index)
+{
+    // When a frame has not finished decoding, always mark it as having alpha.
+    // Ports that check the result of this function to determine their
+    // compositing op need this in order to not draw the undecoded portion as
+    // black.
+    // TODO: Perhaps we should ensure that each individual decoder returns true
+    // in this case.
+    return !frameIsCompleteAtIndex(index)
+        || m_decoder->frameBufferAtIndex(index)->hasAlpha();
+}
+
+bool ImageSource::frameIsCompleteAtIndex(size_t index)
+{
+    if (!m_decoder)
+        return false;
+
+    RGBA32Buffer* buffer = m_decoder->frameBufferAtIndex(index);
+    return buffer && buffer->status() == RGBA32Buffer::FrameComplete;
+}
+
+}