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Diffstat (limited to 'webkit/port/platform/image-decoders/ImageDecoder.h')
| -rw-r--r-- | webkit/port/platform/image-decoders/ImageDecoder.h | 323 |
1 files changed, 0 insertions, 323 deletions
diff --git a/webkit/port/platform/image-decoders/ImageDecoder.h b/webkit/port/platform/image-decoders/ImageDecoder.h deleted file mode 100644 index 617bb54..0000000 --- a/webkit/port/platform/image-decoders/ImageDecoder.h +++ /dev/null @@ -1,323 +0,0 @@ -/* - * Copyright (C) 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. - */ - -#ifndef IMAGE_DECODER_H_ -#define IMAGE_DECODER_H_ - -#include "Assertions.h" -#include "IntRect.h" -#include "ImageSource.h" -#include "NativeImageSkia.h" -#include "PlatformString.h" -#include "SharedBuffer.h" -#include <wtf/PassRefPtr.h> -#include <wtf/RefCounted.h> -#include <wtf/RefPtr.h> -#include <wtf/Vector.h> - -#undef LOG -#include "SkBitmap.h" - -namespace WebCore { - -class RefCountedNativeImageSkia : public RefCounted<RefCountedNativeImageSkia> { - public: - static PassRefPtr<RefCountedNativeImageSkia> create() { - return adoptRef(new RefCountedNativeImageSkia); - } - - const NativeImageSkia& bitmap() const { return m_bitmap; } - NativeImageSkia& bitmap() { return m_bitmap; } - - private: - RefCountedNativeImageSkia() {} - NativeImageSkia m_bitmap; -}; - -// The RGBA32Buffer object represents the decoded image data in RGBA32 format. -// This buffer is what all decoders write a single frame into. Frames are then -// instantiated for drawing by being handed this buffer. -// -// The image data of an RGBA32Buffer is kept in an SkBitmapRef, a refcounting -// container for an SkBitmap. In all normal cases, the refcount should be -// exactly one. The exception happens when resizing the vector<RGBA32Buffer> in -// ImageDecoder::m_frameBufferCache, which copies all the buffers to the new -// vector, thus transiently incrementing the refcount to two. -// -// The choice to use an SkBitmapRef instead of an SkBitmap is not because of -// performance concerns -- SkBitmap refcounts its internal data anyway. Rather, -// we need the aforementioned vector resize to preserve the exact underlying -// SkBitmap object, since we may have already given its address to -// BitmapImage::m_frames. Using an SkBitmap would mean that after ImageDecoder -// resizes its vector, BitmapImage would be holding a pointer to garbage. -class RGBA32Buffer -{ -public: - enum FrameStatus { FrameEmpty, FramePartial, FrameComplete }; - enum FrameDisposalMethod { - // If you change the numeric values of these, make sure you audit all - // users, as some users may cast raw values to/from these constants. - DisposeNotSpecified = 0, // Leave frame in framebuffer - DisposeKeep = 1, // Leave frame in framebuffer - DisposeOverwriteBgcolor = 2, // Clear frame to transparent - DisposeOverwritePrevious = 3, // Clear frame to previous framebuffer contents - }; - - RGBA32Buffer() : m_status(FrameEmpty), - m_duration(0), - m_disposalMethod(DisposeNotSpecified) { - m_bitmapRef = RefCountedNativeImageSkia::create(); - } - - // This constructor doesn't create a new copy of the image data, it only - // increases the ref count of the existing bitmap. - RGBA32Buffer(const RGBA32Buffer& other) { - m_bitmapRef = RefCountedNativeImageSkia::create(); - operator=(other); - } - - ~RGBA32Buffer() { - } - - // Initialize with another buffer. This function doesn't create a new copy - // of the image data, it only increases the refcount of the existing bitmap. - // - // Normal callers should not generally be using this function. If you want - // to create a copy on which you can modify the image data independently, - // use copyBitmapData() instead. - RGBA32Buffer& operator=(const RGBA32Buffer& other) { - if (this == &other) - return *this; - - m_bitmapRef = other.m_bitmapRef; - setRect(other.rect()); - setStatus(other.status()); - setDuration(other.duration()); - setDisposalMethod(other.disposalMethod()); - setHasAlpha(other.hasAlpha()); - return *this; - } - - void clear() { - m_bitmapRef = RefCountedNativeImageSkia::create(); - m_rect = IntRect(); - m_status = FrameEmpty; - m_duration = 0; - m_disposalMethod = DisposeNotSpecified; - } - - // This function creates a new copy of the image data in |other|, so the - // two images can be modified independently. - void copyBitmapData(const RGBA32Buffer& other) { - if (this == &other) - return; - - m_bitmapRef = RefCountedNativeImageSkia::create(); - SkBitmap& bmp = bitmap(); - const SkBitmap& otherBmp = other.bitmap(); - bmp.setConfig(SkBitmap::kARGB_8888_Config, other.width(), - other.height(), otherBmp.rowBytes()); - bmp.allocPixels(); - if (width() > 0 && height() > 0) { - memcpy(bmp.getAddr32(0, 0), - otherBmp.getAddr32(0, 0), - otherBmp.rowBytes() * height()); - } - } - - NativeImageSkia& bitmap() { return m_bitmapRef->bitmap(); } - const NativeImageSkia& bitmap() const { return m_bitmapRef->bitmap(); } - - // Must be called before any pixels are written. Will return true on - // success, false if the memory allocation fails. - bool setSize(int width, int height) { - // This function should only be called once, it will leak memory - // otherwise. - SkBitmap& bmp = bitmap(); - ASSERT(bmp.width() == 0 && bmp.height() == 0); - bmp.setConfig(SkBitmap::kARGB_8888_Config, width, height); - if (!bmp.allocPixels()) - return false; // Allocation failure, maybe the bitmap was too big. - - // Clear the image. - bmp.eraseARGB(0, 0, 0, 0); - - return true; - } - - int width() const { return bitmap().width(); } - int height() const { return bitmap().height(); } - - const IntRect& rect() const { return m_rect; } - FrameStatus status() const { return m_status; } - unsigned duration() const { return m_duration; } - FrameDisposalMethod disposalMethod() const { return m_disposalMethod; } - bool hasAlpha() const { return !bitmap().isOpaque(); } - - void setRect(const IntRect& r) { m_rect = r; } - void setStatus(FrameStatus s) - { - if (s == FrameComplete) - m_bitmapRef->bitmap().setDataComplete(); // Tell the bitmap it's done. - m_status = s; - } - void setDuration(unsigned duration) { m_duration = duration; } - void setDisposalMethod(FrameDisposalMethod method) { m_disposalMethod = method; } - void setHasAlpha(bool alpha) { bitmap().setIsOpaque(!alpha); } - - static void setRGBA(uint32_t* dest, - uint8_t r, uint8_t g, uint8_t b, uint8_t a) - { - // We store this data pre-multiplied. - if (a == 0) { - *dest = 0; - } else { - if (a < 255) { - float alphaPercent = a / 255.0f; - r = static_cast<unsigned>(r * alphaPercent); - g = static_cast<unsigned>(g * alphaPercent); - b = static_cast<unsigned>(b * alphaPercent); - } - *dest = (a << 24 | r << 16 | g << 8 | b); - } - } - - void setRGBA(int x, int y, - uint8_t r, uint8_t g, uint8_t b, uint8_t a) - { - setRGBA(bitmap().getAddr32(x, y), r, g, b, a); - } - -private: - RefPtr<RefCountedNativeImageSkia> m_bitmapRef; - IntRect m_rect; // The rect of the original specified frame within the overall buffer. - // This will always just be the entire buffer except for GIF frames - // whose original rect was smaller than the overall image size. - FrameStatus m_status; // Whether or not this frame is completely finished decoding. - unsigned m_duration; // The animation delay. - FrameDisposalMethod m_disposalMethod; // What to do with this frame's data when initializing the next frame. -}; - -// The ImageDecoder class represents a base class for specific image format decoders -// (e.g., GIF, JPG, PNG, ICO) to derive from. All decoders decode into RGBA32 format -// and the base class manages the RGBA32 frame cache. -class ImageDecoder -{ -public: - ImageDecoder() : m_failed(false), m_sizeAvailable(false) {} - virtual ~ImageDecoder() {} - - // The the filename extension usually associated with an undecoded image of this type. - virtual String filenameExtension() const = 0; - - // All specific decoder plugins must do something with the data they are given. - virtual void setData(SharedBuffer* data, bool allDataReceived) { m_data = data; } - - // Whether or not the size information has been decoded yet. This default - // implementation just returns true if the size has been set and we have not - // seen a failure. Decoders may want to override this to lazily decode - // enough of the image to get the size. - virtual bool isSizeAvailable() const { - return !m_failed && m_sizeAvailable; - }; - - // Requests the size. - virtual IntSize size() const { - // Requesting the size of an invalid bitmap is meaningless. - ASSERT(!m_failed); - return m_size; - } - - // The total number of frames for the image. Classes that support multiple frames - // will scan the image data for the answer if they need to (without necessarily - // decoding all of the individual frames). - virtual int frameCount() { return 1; } - - // The number of repetitions to perform for an animation loop. - virtual int repetitionCount() const { return cAnimationNone; } - - // Called to obtain the RGBA32Buffer full of decoded data for rendering. The - // decoder plugin will decode as much of the frame as it can before handing - // back the buffer. - virtual RGBA32Buffer* frameBufferAtIndex(size_t index) = 0; - - // Whether or not the underlying image format even supports alpha transparency. - virtual bool supportsAlpha() const { return true; } - - bool failed() const { return m_failed; } - void setFailed() { m_failed = true; } - - // Wipe out frames in the frame buffer cache before |clearBeforeFrame|, - // assuming this can be done without breaking decoding. Different decoders - // place different restrictions on what frames are safe to destroy, so this - // is left to them to implement. - // For convenience's sake, we provide a default (empty) implementation, - // since in practice only GIFs will ever use this. - virtual void clearFrameBufferCache(size_t clearBeforeFrame) { } - -protected: - // Called by the image decoders to set their decoded size, this also check - // the size for validity. It will return true if the size was set, or false - // if there is an error. On error, the m_failed flag will be set and the - // caller should immediately stop decoding. - bool setSize(unsigned width, unsigned height) { - if (isOverSize(width, height)) { - m_failed = true; - return false; - } - m_size = IntSize(width, height); - m_sizeAvailable = true; - return true; - } - - RefPtr<SharedBuffer> m_data; // The encoded data. - Vector<RGBA32Buffer> m_frameBufferCache; - mutable bool m_failed; - -private: - // This function allows us to make sure the image is not too large. Very - // large images, even if the allocation succeeds, can take a very long time - // to process, giving the appearance of a DoS. - // - // WebKit also seems to like to ask for the size before data is available - // and in some cases when the failed flag is set. Some of these code paths - // such as BitmapImage::resetAnimation then compute the size of the image - // based on the width and height. Because of this, our total computed image - // byte size must never overflow an int. - static bool isOverSize(unsigned width, unsigned height) { - unsigned long long total_size = static_cast<unsigned long long>(width) * - static_cast<unsigned long long>(height); - if (total_size > 32 * 1024 * 1024) // 32M = 128MB memory total (32 bpp). - return true; - return false; - } - - IntSize m_size; - bool m_sizeAvailable; -}; - -} - -#endif |