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/*
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2008, 2009 Google, 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 "platform/image-decoders/ImageFrame.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "platform/image-decoders/ImageDecoder.h"
namespace blink {
ImageFrame::ImageFrame()
: m_allocator(0),
m_hasAlpha(true),
m_status(FrameEmpty),
m_duration(0),
m_disposalMethod(DisposeNotSpecified),
m_alphaBlendSource(BlendAtopPreviousFrame),
m_premultiplyAlpha(true),
m_pixelsChanged(false),
m_requiredPreviousFrameIndex(kNotFound) {}
ImageFrame& ImageFrame::operator=(const ImageFrame& other) {
if (this == &other)
return *this;
m_bitmap = other.m_bitmap;
// Keep the pixels locked since we will be writing directly into the
// bitmap throughout this object's lifetime.
m_bitmap.lockPixels();
// Be sure to assign this before calling setStatus(), since setStatus() may
// call notifyBitmapIfPixelsChanged().
m_pixelsChanged = other.m_pixelsChanged;
setMemoryAllocator(other.allocator());
setOriginalFrameRect(other.originalFrameRect());
setStatus(other.getStatus());
setDuration(other.duration());
setDisposalMethod(other.getDisposalMethod());
setAlphaBlendSource(other.getAlphaBlendSource());
setPremultiplyAlpha(other.premultiplyAlpha());
// Be sure that this is called after we've called setStatus(), since we
// look at our status to know what to do with the alpha value.
setHasAlpha(other.hasAlpha());
setRequiredPreviousFrameIndex(other.requiredPreviousFrameIndex());
return *this;
}
void ImageFrame::clearPixelData() {
m_bitmap.reset();
m_status = FrameEmpty;
// NOTE: Do not reset other members here; clearFrameBufferCache()
// calls this to free the bitmap data, but other functions like
// initFrameBuffer() and frameComplete() may still need to read
// other metadata out of this frame later.
}
void ImageFrame::zeroFillPixelData() {
m_bitmap.eraseARGB(0, 0, 0, 0);
m_hasAlpha = true;
}
bool ImageFrame::copyBitmapData(const ImageFrame& other) {
DCHECK_NE(this, &other);
m_hasAlpha = other.m_hasAlpha;
m_bitmap.reset();
return other.m_bitmap.copyTo(&m_bitmap, other.m_bitmap.colorType());
}
bool ImageFrame::takeBitmapDataIfWritable(ImageFrame* other) {
DCHECK(other);
DCHECK_EQ(FrameComplete, other->m_status);
DCHECK_EQ(FrameEmpty, m_status);
DCHECK_NE(this, other);
if (other->m_bitmap.isImmutable())
return false;
m_hasAlpha = other->m_hasAlpha;
m_bitmap.reset();
m_bitmap.swap(other->m_bitmap);
other->m_status = FrameEmpty;
return true;
}
bool ImageFrame::setSizeAndColorSpace(int newWidth,
int newHeight,
sk_sp<SkColorSpace> colorSpace) {
// setSizeAndColorSpace() should only be called once, it leaks memory
// otherwise.
DCHECK(!width() && !height());
m_bitmap.setInfo(SkImageInfo::MakeN32(
newWidth, newHeight,
m_premultiplyAlpha ? kPremul_SkAlphaType : kUnpremul_SkAlphaType,
std::move(colorSpace)));
if (!m_bitmap.tryAllocPixels(m_allocator, 0))
return false;
zeroFillPixelData();
return true;
}
bool ImageFrame::hasAlpha() const {
return m_hasAlpha;
}
sk_sp<SkImage> ImageFrame::finalizePixelsAndGetImage() {
DCHECK_EQ(FrameComplete, m_status);
m_bitmap.setImmutable();
return SkImage::MakeFromBitmap(m_bitmap);
}
void ImageFrame::setHasAlpha(bool alpha) {
m_hasAlpha = alpha;
m_bitmap.setAlphaType(computeAlphaType());
}
void ImageFrame::setStatus(Status status) {
m_status = status;
if (m_status == FrameComplete) {
m_bitmap.setAlphaType(computeAlphaType());
// Send pending pixels changed notifications now, because we can't do
// this after the bitmap has been marked immutable. We don't set the
// bitmap immutable here because it would defeat
// takeBitmapDataIfWritable(). Instead we let the bitmap stay mutable
// until someone calls finalizePixelsAndGetImage() to actually get the
// SkImage.
notifyBitmapIfPixelsChanged();
}
}
void ImageFrame::zeroFillFrameRect(const IntRect& rect) {
if (rect.isEmpty())
return;
m_bitmap.eraseArea(rect, SkColorSetARGB(0, 0, 0, 0));
setHasAlpha(true);
}
static uint8_t blendChannel(uint8_t src,
uint8_t srcA,
uint8_t dst,
uint8_t dstA,
unsigned scale) {
unsigned blendUnscaled = src * srcA + dst * dstA;
DCHECK(blendUnscaled < (1ULL << 32) / scale);
return (blendUnscaled * scale) >> 24;
}
static uint32_t blendSrcOverDstNonPremultiplied(uint32_t src, uint32_t dst) {
uint8_t srcA = SkGetPackedA32(src);
if (srcA == 0)
return dst;
uint8_t dstA = SkGetPackedA32(dst);
uint8_t dstFactorA = (dstA * SkAlpha255To256(255 - srcA)) >> 8;
DCHECK(srcA + dstFactorA < (1U << 8));
uint8_t blendA = srcA + dstFactorA;
unsigned scale = (1UL << 24) / blendA;
uint8_t blendR = blendChannel(SkGetPackedR32(src), srcA, SkGetPackedR32(dst),
dstFactorA, scale);
uint8_t blendG = blendChannel(SkGetPackedG32(src), srcA, SkGetPackedG32(dst),
dstFactorA, scale);
uint8_t blendB = blendChannel(SkGetPackedB32(src), srcA, SkGetPackedB32(dst),
dstFactorA, scale);
return SkPackARGB32NoCheck(blendA, blendR, blendG, blendB);
}
void ImageFrame::blendRGBARaw(PixelData* dest,
unsigned r,
unsigned g,
unsigned b,
unsigned a) {
*dest =
blendSrcOverDstNonPremultiplied(SkPackARGB32NoCheck(a, r, g, b), *dest);
}
void ImageFrame::blendSrcOverDstRaw(PixelData* src, PixelData dst) {
*src = blendSrcOverDstNonPremultiplied(*src, dst);
}
SkAlphaType ImageFrame::computeAlphaType() const {
// If the frame is not fully loaded, there will be transparent pixels,
// so we can't tell skia we're opaque, even for image types that logically
// always are (e.g. jpeg).
if (!m_hasAlpha && m_status == FrameComplete)
return kOpaque_SkAlphaType;
return m_premultiplyAlpha ? kPremul_SkAlphaType : kUnpremul_SkAlphaType;
}
} // namespace blink
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