/* * 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 "ImageSource.h" #if PLATFORM(CG) #include "ImageSourceCG.h" #include "IntSize.h" #include "MIMETypeRegistry.h" #include "SharedBuffer.h" #include #include namespace WebCore { static const CFStringRef kCGImageSourceShouldPreferRGB32 = CFSTR("kCGImageSourceShouldPreferRGB32"); static const CFStringRef kCGImageSourceDoNotCacheImageBlocks = CFSTR("kCGImageSourceDoNotCacheImageBlocks"); ImageSource::ImageSource() : m_decoder(0) { } ImageSource::~ImageSource() { clear(true); } void ImageSource::clear(bool destroyAllFrames, size_t, SharedBuffer* data, bool allDataReceived) { #if PLATFORM(MAC) && !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD) // Recent versions of ImageIO discard previously decoded image frames if the client // application no longer holds references to them, so there's no need to throw away // the decoder unless we're explicitly asked to destroy all of the frames. if (!destroyAllFrames) return; #else // Older versions of ImageIO hold references to previously decoded image frames. // There is no API to selectively release some of the frames it is holding, and // if we don't release the frames we use too much memory on large images. // Destroying the decoder is the only way to release previous frames. UNUSED_PARAM(destroyAllFrames); #endif if (m_decoder) { CFRelease(m_decoder); m_decoder = 0; } if (data) setData(data, allDataReceived); } static CFDictionaryRef imageSourceOptions() { static CFDictionaryRef options; if (!options) { const void* keys[3] = { kCGImageSourceShouldCache, kCGImageSourceShouldPreferRGB32, kCGImageSourceDoNotCacheImageBlocks }; const void* values[3] = { kCFBooleanTrue, kCFBooleanTrue, kCFBooleanTrue }; options = CFDictionaryCreate(NULL, keys, values, 3, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); } return options; } bool ImageSource::initialized() const { return m_decoder; } void ImageSource::setData(SharedBuffer* data, bool allDataReceived) { if (!m_decoder) m_decoder = CGImageSourceCreateIncremental(NULL); #if PLATFORM(MAC) // On Mac the NSData inside the SharedBuffer can be secretly appended to without the SharedBuffer's knowledge. We use SharedBuffer's ability // to wrap itself inside CFData to get around this, ensuring that ImageIO is really looking at the SharedBuffer. CFDataRef cfData = data->createCFData(); #else // If no NSData is available, then we know SharedBuffer will always just be a vector. That means no secret changes can occur to it behind the // scenes. We use CFDataCreateWithBytesNoCopy in that case. CFDataRef cfData = CFDataCreateWithBytesNoCopy(0, reinterpret_cast(data->data()), data->size(), kCFAllocatorNull); #endif CGImageSourceUpdateData(m_decoder, cfData, allDataReceived); CFRelease(cfData); } String ImageSource::filenameExtension() const { if (!m_decoder) return String(); CFStringRef imageSourceType = CGImageSourceGetType(m_decoder); return WebCore::preferredExtensionForImageSourceType(imageSourceType); } bool ImageSource::isSizeAvailable() { bool result = false; CGImageSourceStatus imageSourceStatus = CGImageSourceGetStatus(m_decoder); // Ragnaros yells: TOO SOON! You have awakened me TOO SOON, Executus! if (imageSourceStatus >= kCGImageStatusIncomplete) { CFDictionaryRef image0Properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, 0, imageSourceOptions()); if (image0Properties) { CFNumberRef widthNumber = (CFNumberRef)CFDictionaryGetValue(image0Properties, kCGImagePropertyPixelWidth); CFNumberRef heightNumber = (CFNumberRef)CFDictionaryGetValue(image0Properties, kCGImagePropertyPixelHeight); result = widthNumber && heightNumber; CFRelease(image0Properties); } } return result; } IntSize ImageSource::frameSizeAtIndex(size_t index) const { IntSize result; CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, index, imageSourceOptions()); if (properties) { int w = 0, h = 0; CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth); if (num) CFNumberGetValue(num, kCFNumberIntType, &w); num = (CFNumberRef)CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight); if (num) CFNumberGetValue(num, kCFNumberIntType, &h); result = IntSize(w, h); CFRelease(properties); } return result; } IntSize ImageSource::size() const { return frameSizeAtIndex(0); } int ImageSource::repetitionCount() { int result = cAnimationLoopOnce; // No property means loop once. if (!initialized()) return result; // A property with value 0 means loop forever. CFDictionaryRef properties = CGImageSourceCopyProperties(m_decoder, imageSourceOptions()); if (properties) { CFDictionaryRef gifProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary); if (gifProperties) { CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(gifProperties, kCGImagePropertyGIFLoopCount); if (num) CFNumberGetValue(num, kCFNumberIntType, &result); } else result = cAnimationNone; // Turns out we're not a GIF after all, so we don't animate. CFRelease(properties); } return result; } size_t ImageSource::frameCount() const { return m_decoder ? CGImageSourceGetCount(m_decoder) : 0; } CGImageRef ImageSource::createFrameAtIndex(size_t index) { if (!initialized()) return 0; CGImageRef image = CGImageSourceCreateImageAtIndex(m_decoder, index, imageSourceOptions()); CFStringRef imageUTI = CGImageSourceGetType(m_decoder); static const CFStringRef xbmUTI = CFSTR("public.xbitmap-image"); if (!imageUTI || !CFEqual(imageUTI, xbmUTI)) return image; // If it is an xbm image, mask out all the white areas to render them transparent. const CGFloat maskingColors[6] = {255, 255, 255, 255, 255, 255}; CGImageRef maskedImage = CGImageCreateWithMaskingColors(image, maskingColors); if (!maskedImage) return image; CGImageRelease(image); return maskedImage; } bool ImageSource::frameIsCompleteAtIndex(size_t index) { return CGImageSourceGetStatusAtIndex(m_decoder, index) == kCGImageStatusComplete; } float ImageSource::frameDurationAtIndex(size_t index) { if (!initialized()) return 0; float duration = 0; CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, index, imageSourceOptions()); if (properties) { CFDictionaryRef typeProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary); if (typeProperties) { CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(typeProperties, kCGImagePropertyGIFDelayTime); if (num) CFNumberGetValue(num, kCFNumberFloatType, &duration); } CFRelease(properties); } // Many annoying ads specify a 0 duration to make an image flash as quickly as possible. // We follow WinIE's behavior and use a duration of 100 ms for any frames that specify // a duration of <= 50 ms. See or Radar 4051389 for more. if (duration < 0.051f) return 0.100f; return duration; } bool ImageSource::frameHasAlphaAtIndex(size_t) { if (!m_decoder) return false; CFStringRef imageType = CGImageSourceGetType(m_decoder); // Return false if there is no image type or the image type is JPEG, because // JPEG does not support alpha transparency. if (!imageType || CFEqual(imageType, CFSTR("public.jpeg"))) return false; // FIXME: Could return false for other non-transparent image formats. // FIXME: Could maybe return false for a GIF Frame if we have enough info in the GIF properties dictionary // to determine whether or not a transparent color was defined. return true; } } #endif // PLATFORM(CG)