mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/image/FrameAnimator.cpp

884 строки
31 KiB
C++
Исходник Ответственный История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "FrameAnimator.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Move.h"
#include "imgIContainer.h"
#include "LookupResult.h"
#include "MainThreadUtils.h"
#include "RasterImage.h"
#include "pixman.h"
namespace mozilla {
using namespace gfx;
namespace image {
int32_t
FrameAnimator::GetSingleLoopTime() const
{
// If we aren't done decoding, we don't know the image's full play time.
if (!mDoneDecoding) {
return -1;
}
// If we're not looping, a single loop time has no meaning
if (mAnimationMode != imgIContainer::kNormalAnimMode) {
return -1;
}
int32_t looptime = 0;
for (uint32_t i = 0; i < mImage->GetNumFrames(); ++i) {
int32_t timeout = GetTimeoutForFrame(i);
if (timeout >= 0) {
looptime += static_cast<uint32_t>(timeout);
} else {
// If we have a frame that never times out, we're probably in an error
// case, but let's handle it more gracefully.
NS_WARNING("Negative frame timeout - how did this happen?");
return -1;
}
}
return looptime;
}
TimeStamp
FrameAnimator::GetCurrentImgFrameEndTime() const
{
TimeStamp currentFrameTime = mCurrentAnimationFrameTime;
int32_t timeout =
GetTimeoutForFrame(mCurrentAnimationFrameIndex);
if (timeout < 0) {
// We need to return a sentinel value in this case, because our logic
// doesn't work correctly if we have a negative timeout value. We use
// one year in the future as the sentinel because it works with the loop
// in RequestRefresh() below.
// XXX(seth): It'd be preferable to make our logic work correctly with
// negative timeouts.
return TimeStamp::NowLoRes() +
TimeDuration::FromMilliseconds(31536000.0);
}
TimeDuration durationOfTimeout =
TimeDuration::FromMilliseconds(static_cast<double>(timeout));
TimeStamp currentFrameEndTime = currentFrameTime + durationOfTimeout;
return currentFrameEndTime;
}
FrameAnimator::RefreshResult
FrameAnimator::AdvanceFrame(TimeStamp aTime)
{
NS_ASSERTION(aTime <= TimeStamp::Now(),
"Given time appears to be in the future");
PROFILER_LABEL_FUNC(js::ProfileEntry::Category::GRAPHICS);
RefreshResult ret;
// Determine what the next frame is, taking into account looping.
uint32_t currentFrameIndex = mCurrentAnimationFrameIndex;
uint32_t nextFrameIndex = currentFrameIndex + 1;
if (mImage->GetNumFrames() == nextFrameIndex) {
// We can only accurately determine if we are at the end of the loop if we are
// done decoding, otherwise we don't know how many frames there will be.
if (!mDoneDecoding) {
// We've already advanced to the last decoded frame, nothing more we can do.
// We're blocked by network/decoding from displaying the animation at the
// rate specified, so that means the frame we are displaying (the latest
// available) is the frame we want to be displaying at this time. So we
// update the current animation time. If we didn't update the current
// animation time then it could lag behind, which would indicate that we
// are behind in the animation and should try to catch up. When we are
// done decoding (and thus can loop around back to the start of the
// animation) we would then jump to a random point in the animation to
// try to catch up. But we were never behind in the animation.
mCurrentAnimationFrameTime = aTime;
return ret;
}
// End of an animation loop...
// If we are not looping forever, initialize the loop counter
if (mLoopRemainingCount < 0 && LoopCount() >= 0) {
mLoopRemainingCount = LoopCount();
}
// If animation mode is "loop once", or we're at end of loop counter,
// it's time to stop animating.
if (mAnimationMode == imgIContainer::kLoopOnceAnimMode ||
mLoopRemainingCount == 0) {
ret.animationFinished = true;
}
nextFrameIndex = 0;
if (mLoopRemainingCount > 0) {
mLoopRemainingCount--;
}
// If we're done, exit early.
if (ret.animationFinished) {
return ret;
}
}
// There can be frames in the surface cache with index >= mImage->GetNumFrames()
// that GetRawFrame can access because the decoding thread has decoded them, but
// RasterImage hasn't acknowledged those frames yet. We don't want to go past
// what RasterImage knows about so that we stay in sync with RasterImage. The code
// above should obey this, the MOZ_ASSERT records this invariant.
MOZ_ASSERT(nextFrameIndex < mImage->GetNumFrames());
RawAccessFrameRef nextFrame = GetRawFrame(nextFrameIndex);
// If we're done decoding, we know we've got everything we're going to get.
// If we aren't, we only display fully-downloaded frames; everything else
// gets delayed.
bool canDisplay = mDoneDecoding ||
(nextFrame && nextFrame->IsFinished());
if (!canDisplay) {
// Uh oh, the frame we want to show is currently being decoded (partial)
// Wait until the next refresh driver tick and try again
return ret;
}
// Bad data
if (GetTimeoutForFrame(nextFrameIndex) < 0) {
ret.animationFinished = true;
ret.error = true;
}
if (nextFrameIndex == 0) {
ret.dirtyRect = mFirstFrameRefreshArea;
} else {
MOZ_ASSERT(nextFrameIndex == currentFrameIndex + 1);
// Change frame
if (!DoBlend(&ret.dirtyRect, currentFrameIndex, nextFrameIndex)) {
// something went wrong, move on to next
NS_WARNING("FrameAnimator::AdvanceFrame(): Compositing of frame failed");
nextFrame->SetCompositingFailed(true);
mCurrentAnimationFrameTime = GetCurrentImgFrameEndTime();
mCurrentAnimationFrameIndex = nextFrameIndex;
ret.error = true;
return ret;
}
nextFrame->SetCompositingFailed(false);
}
mCurrentAnimationFrameTime = GetCurrentImgFrameEndTime();
// If we can get closer to the current time by a multiple of the image's loop
// time, we should. We need to be done decoding in order to know the full loop
// time though!
int32_t loopTime = GetSingleLoopTime();
if (loopTime > 0) {
// We shouldn't be advancing by a whole loop unless we are decoded and know
// what a full loop actually is. GetSingleLoopTime should return -1 so this
// never happens.
MOZ_ASSERT(mDoneDecoding);
TimeDuration delay = aTime - mCurrentAnimationFrameTime;
if (delay.ToMilliseconds() > loopTime) {
// Explicitly use integer division to get the floor of the number of
// loops.
uint64_t loops = static_cast<uint64_t>(delay.ToMilliseconds()) / loopTime;
mCurrentAnimationFrameTime +=
TimeDuration::FromMilliseconds(loops * loopTime);
}
}
// Set currentAnimationFrameIndex at the last possible moment
mCurrentAnimationFrameIndex = nextFrameIndex;
// If we're here, we successfully advanced the frame.
ret.frameAdvanced = true;
return ret;
}
FrameAnimator::RefreshResult
FrameAnimator::RequestRefresh(const TimeStamp& aTime)
{
// only advance the frame if the current time is greater than or
// equal to the current frame's end time.
TimeStamp currentFrameEndTime = GetCurrentImgFrameEndTime();
// By default, an empty RefreshResult.
RefreshResult ret;
while (currentFrameEndTime <= aTime) {
TimeStamp oldFrameEndTime = currentFrameEndTime;
RefreshResult frameRes = AdvanceFrame(aTime);
// Accumulate our result for returning to callers.
ret.Accumulate(frameRes);
currentFrameEndTime = GetCurrentImgFrameEndTime();
// if we didn't advance a frame, and our frame end time didn't change,
// then we need to break out of this loop & wait for the frame(s)
// to finish downloading
if (!frameRes.frameAdvanced && (currentFrameEndTime == oldFrameEndTime)) {
break;
}
}
return ret;
}
void
FrameAnimator::ResetAnimation()
{
mCurrentAnimationFrameIndex = 0;
mLastCompositedFrameIndex = -1;
}
void
FrameAnimator::SetDoneDecoding(bool aDone)
{
mDoneDecoding = aDone;
}
void
FrameAnimator::SetAnimationMode(uint16_t aAnimationMode)
{
mAnimationMode = aAnimationMode;
}
void
FrameAnimator::InitAnimationFrameTimeIfNecessary()
{
if (mCurrentAnimationFrameTime.IsNull()) {
mCurrentAnimationFrameTime = TimeStamp::Now();
}
}
void
FrameAnimator::SetAnimationFrameTime(const TimeStamp& aTime)
{
mCurrentAnimationFrameTime = aTime;
}
void
FrameAnimator::UnionFirstFrameRefreshArea(const nsIntRect& aRect)
{
mFirstFrameRefreshArea.UnionRect(mFirstFrameRefreshArea, aRect);
}
uint32_t
FrameAnimator::GetCurrentAnimationFrameIndex() const
{
return mCurrentAnimationFrameIndex;
}
nsIntRect
FrameAnimator::GetFirstFrameRefreshArea() const
{
return mFirstFrameRefreshArea;
}
LookupResult
FrameAnimator::GetCompositedFrame(uint32_t aFrameNum)
{
MOZ_ASSERT(aFrameNum != 0, "First frame is never composited");
// If we have a composited version of this frame, return that.
if (mLastCompositedFrameIndex == int32_t(aFrameNum)) {
return LookupResult(mCompositingFrame->DrawableRef(), MatchType::EXACT);
}
// Otherwise return the raw frame. DoBlend is required to ensure that we only
// hit this case if the frame is not paletted and doesn't require compositing.
LookupResult result =
SurfaceCache::Lookup(ImageKey(mImage),
RasterSurfaceKey(mSize,
DefaultSurfaceFlags(),
aFrameNum));
MOZ_ASSERT(!result || !result.DrawableRef()->GetIsPaletted(),
"About to return a paletted frame");
return result;
}
int32_t
FrameAnimator::GetTimeoutForFrame(uint32_t aFrameNum) const
{
int32_t rawTimeout = 0;
RawAccessFrameRef frame = GetRawFrame(aFrameNum);
if (frame) {
AnimationData data = frame->GetAnimationData();
rawTimeout = data.mRawTimeout;
} else if (aFrameNum == 0) {
rawTimeout = mFirstFrameTimeout;
} else {
NS_WARNING("No frame; called GetTimeoutForFrame too early?");
return 100;
}
// Ensure a minimal time between updates so we don't throttle the UI thread.
// consider 0 == unspecified and make it fast but not too fast. Unless we
// have a single loop GIF. See bug 890743, bug 125137, bug 139677, and bug
// 207059. The behavior of recent IE and Opera versions seems to be:
// IE 6/Win:
// 10 - 50ms go 100ms
// >50ms go correct speed
// Opera 7 final/Win:
// 10ms goes 100ms
// >10ms go correct speed
// It seems that there are broken tools out there that set a 0ms or 10ms
// timeout when they really want a "default" one. So munge values in that
// range.
if (rawTimeout >= 0 && rawTimeout <= 10) {
return 100;
}
return rawTimeout;
}
static void
DoCollectSizeOfCompositingSurfaces(const RawAccessFrameRef& aSurface,
SurfaceMemoryCounterType aType,
nsTArray<SurfaceMemoryCounter>& aCounters,
MallocSizeOf aMallocSizeOf)
{
// Concoct a SurfaceKey for this surface.
SurfaceKey key = RasterSurfaceKey(aSurface->GetImageSize(),
DefaultSurfaceFlags(),
/* aFrameNum = */ 0);
// Create a counter for this surface.
SurfaceMemoryCounter counter(key, /* aIsLocked = */ true, aType);
// Extract the surface's memory usage information.
size_t heap = 0, nonHeap = 0;
aSurface->AddSizeOfExcludingThis(aMallocSizeOf, heap, nonHeap);
counter.Values().SetDecodedHeap(heap);
counter.Values().SetDecodedNonHeap(nonHeap);
// Record it.
aCounters.AppendElement(counter);
}
void
FrameAnimator::CollectSizeOfCompositingSurfaces(
nsTArray<SurfaceMemoryCounter>& aCounters,
MallocSizeOf aMallocSizeOf) const
{
if (mCompositingFrame) {
DoCollectSizeOfCompositingSurfaces(mCompositingFrame,
SurfaceMemoryCounterType::COMPOSITING,
aCounters,
aMallocSizeOf);
}
if (mCompositingPrevFrame) {
DoCollectSizeOfCompositingSurfaces(mCompositingPrevFrame,
SurfaceMemoryCounterType::COMPOSITING_PREV,
aCounters,
aMallocSizeOf);
}
}
RawAccessFrameRef
FrameAnimator::GetRawFrame(uint32_t aFrameNum) const
{
LookupResult result =
SurfaceCache::Lookup(ImageKey(mImage),
RasterSurfaceKey(mSize,
DefaultSurfaceFlags(),
aFrameNum));
return result ? result.DrawableRef()->RawAccessRef()
: RawAccessFrameRef();
}
//******************************************************************************
// DoBlend gets called when the timer for animation get fired and we have to
// update the composited frame of the animation.
bool
FrameAnimator::DoBlend(nsIntRect* aDirtyRect,
uint32_t aPrevFrameIndex,
uint32_t aNextFrameIndex)
{
RawAccessFrameRef prevFrame = GetRawFrame(aPrevFrameIndex);
RawAccessFrameRef nextFrame = GetRawFrame(aNextFrameIndex);
MOZ_ASSERT(prevFrame && nextFrame, "Should have frames here");
AnimationData prevFrameData = prevFrame->GetAnimationData();
if (prevFrameData.mDisposalMethod == DisposalMethod::RESTORE_PREVIOUS &&
!mCompositingPrevFrame) {
prevFrameData.mDisposalMethod = DisposalMethod::CLEAR;
}
bool isFullPrevFrame = prevFrameData.mRect.x == 0 &&
prevFrameData.mRect.y == 0 &&
prevFrameData.mRect.width == mSize.width &&
prevFrameData.mRect.height == mSize.height;
// Optimization: DisposeClearAll if the previous frame is the same size as
// container and it's clearing itself
if (isFullPrevFrame &&
(prevFrameData.mDisposalMethod == DisposalMethod::CLEAR)) {
prevFrameData.mDisposalMethod = DisposalMethod::CLEAR_ALL;
}
AnimationData nextFrameData = nextFrame->GetAnimationData();
bool isFullNextFrame = nextFrameData.mRect.x == 0 &&
nextFrameData.mRect.y == 0 &&
nextFrameData.mRect.width == mSize.width &&
nextFrameData.mRect.height == mSize.height;
if (!nextFrame->GetIsPaletted()) {
// Optimization: Skip compositing if the previous frame wants to clear the
// whole image
if (prevFrameData.mDisposalMethod == DisposalMethod::CLEAR_ALL) {
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
return true;
}
// Optimization: Skip compositing if this frame is the same size as the
// container and it's fully drawing over prev frame (no alpha)
if (isFullNextFrame &&
(nextFrameData.mDisposalMethod != DisposalMethod::RESTORE_PREVIOUS) &&
!nextFrameData.mHasAlpha) {
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
return true;
}
}
// Calculate area that needs updating
switch (prevFrameData.mDisposalMethod) {
default:
MOZ_FALLTHROUGH_ASSERT("Unexpected DisposalMethod");
case DisposalMethod::NOT_SPECIFIED:
case DisposalMethod::KEEP:
*aDirtyRect = nextFrameData.mRect;
break;
case DisposalMethod::CLEAR_ALL:
// Whole image container is cleared
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
break;
case DisposalMethod::CLEAR:
// Calc area that needs to be redrawn (the combination of previous and
// this frame)
// XXX - This could be done with multiple framechanged calls
// Having prevFrame way at the top of the image, and nextFrame
// way at the bottom, and both frames being small, we'd be
// telling framechanged to refresh the whole image when only two
// small areas are needed.
aDirtyRect->UnionRect(nextFrameData.mRect, prevFrameData.mRect);
break;
case DisposalMethod::RESTORE_PREVIOUS:
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
break;
}
// Optimization:
// Skip compositing if the last composited frame is this frame
// (Only one composited frame was made for this animation. Example:
// Only Frame 3 of a 10 frame image required us to build a composite frame
// On the second loop, we do not need to rebuild the frame
// since it's still sitting in compositingFrame)
if (mLastCompositedFrameIndex == int32_t(aNextFrameIndex)) {
return true;
}
bool needToBlankComposite = false;
// Create the Compositing Frame
if (!mCompositingFrame) {
RefPtr<imgFrame> newFrame = new imgFrame;
nsresult rv = newFrame->InitForDecoder(mSize,
SurfaceFormat::B8G8R8A8);
if (NS_FAILED(rv)) {
mCompositingFrame.reset();
return false;
}
mCompositingFrame = newFrame->RawAccessRef();
needToBlankComposite = true;
} else if (int32_t(aNextFrameIndex) != mLastCompositedFrameIndex+1) {
// If we are not drawing on top of last composited frame,
// then we are building a new composite frame, so let's clear it first.
needToBlankComposite = true;
}
AnimationData compositingFrameData = mCompositingFrame->GetAnimationData();
// More optimizations possible when next frame is not transparent
// But if the next frame has DisposalMethod::RESTORE_PREVIOUS,
// this "no disposal" optimization is not possible,
// because the frame in "after disposal operation" state
// needs to be stored in compositingFrame, so it can be
// copied into compositingPrevFrame later.
bool doDisposal = true;
if (!nextFrameData.mHasAlpha &&
nextFrameData.mDisposalMethod != DisposalMethod::RESTORE_PREVIOUS) {
if (isFullNextFrame) {
// Optimization: No need to dispose prev.frame when
// next frame is full frame and not transparent.
doDisposal = false;
// No need to blank the composite frame
needToBlankComposite = false;
} else {
if ((prevFrameData.mRect.x >= nextFrameData.mRect.x) &&
(prevFrameData.mRect.y >= nextFrameData.mRect.y) &&
(prevFrameData.mRect.x + prevFrameData.mRect.width <=
nextFrameData.mRect.x + nextFrameData.mRect.width) &&
(prevFrameData.mRect.y + prevFrameData.mRect.height <=
nextFrameData.mRect.y + nextFrameData.mRect.height)) {
// Optimization: No need to dispose prev.frame when
// next frame fully overlaps previous frame.
doDisposal = false;
}
}
}
if (doDisposal) {
// Dispose of previous: clear, restore, or keep (copy)
switch (prevFrameData.mDisposalMethod) {
case DisposalMethod::CLEAR:
if (needToBlankComposite) {
// If we just created the composite, it could have anything in its
// buffer. Clear whole frame
ClearFrame(compositingFrameData.mRawData,
compositingFrameData.mRect);
} else {
// Only blank out previous frame area (both color & Mask/Alpha)
ClearFrame(compositingFrameData.mRawData,
compositingFrameData.mRect,
prevFrameData.mRect);
}
break;
case DisposalMethod::CLEAR_ALL:
ClearFrame(compositingFrameData.mRawData,
compositingFrameData.mRect);
break;
case DisposalMethod::RESTORE_PREVIOUS:
// It would be better to copy only the area changed back to
// compositingFrame.
if (mCompositingPrevFrame) {
AnimationData compositingPrevFrameData =
mCompositingPrevFrame->GetAnimationData();
CopyFrameImage(compositingPrevFrameData.mRawData,
compositingPrevFrameData.mRect,
compositingFrameData.mRawData,
compositingFrameData.mRect);
// destroy only if we don't need it for this frame's disposal
if (nextFrameData.mDisposalMethod !=
DisposalMethod::RESTORE_PREVIOUS) {
mCompositingPrevFrame.reset();
}
} else {
ClearFrame(compositingFrameData.mRawData,
compositingFrameData.mRect);
}
break;
default:
MOZ_FALLTHROUGH_ASSERT("Unexpected DisposalMethod");
case DisposalMethod::NOT_SPECIFIED:
case DisposalMethod::KEEP:
// Copy previous frame into compositingFrame before we put the new
// frame on top
// Assumes that the previous frame represents a full frame (it could be
// smaller in size than the container, as long as the frame before it
// erased itself)
// Note: Frame 1 never gets into DoBlend(), so (aNextFrameIndex - 1)
// will always be a valid frame number.
if (mLastCompositedFrameIndex != int32_t(aNextFrameIndex - 1)) {
if (isFullPrevFrame && !prevFrame->GetIsPaletted()) {
// Just copy the bits
CopyFrameImage(prevFrameData.mRawData,
prevFrameData.mRect,
compositingFrameData.mRawData,
compositingFrameData.mRect);
} else {
if (needToBlankComposite) {
// Only blank composite when prev is transparent or not full.
if (prevFrameData.mHasAlpha || !isFullPrevFrame) {
ClearFrame(compositingFrameData.mRawData,
compositingFrameData.mRect);
}
}
DrawFrameTo(prevFrameData.mRawData, prevFrameData.mRect,
prevFrameData.mPaletteDataLength,
prevFrameData.mHasAlpha,
compositingFrameData.mRawData,
compositingFrameData.mRect,
prevFrameData.mBlendMethod,
prevFrameData.mBlendRect);
}
}
}
} else if (needToBlankComposite) {
// If we just created the composite, it could have anything in its
// buffers. Clear them
ClearFrame(compositingFrameData.mRawData,
compositingFrameData.mRect);
}
// Check if the frame we are composing wants the previous image restored after
// it is done. Don't store it (again) if last frame wanted its image restored
// too
if ((nextFrameData.mDisposalMethod == DisposalMethod::RESTORE_PREVIOUS) &&
(prevFrameData.mDisposalMethod != DisposalMethod::RESTORE_PREVIOUS)) {
// We are storing the whole image.
// It would be better if we just stored the area that nextFrame is going to
// overwrite.
if (!mCompositingPrevFrame) {
RefPtr<imgFrame> newFrame = new imgFrame;
nsresult rv = newFrame->InitForDecoder(mSize,
SurfaceFormat::B8G8R8A8);
if (NS_FAILED(rv)) {
mCompositingPrevFrame.reset();
return false;
}
mCompositingPrevFrame = newFrame->RawAccessRef();
}
AnimationData compositingPrevFrameData =
mCompositingPrevFrame->GetAnimationData();
CopyFrameImage(compositingFrameData.mRawData,
compositingFrameData.mRect,
compositingPrevFrameData.mRawData,
compositingPrevFrameData.mRect);
mCompositingPrevFrame->Finish();
}
// blit next frame into it's correct spot
DrawFrameTo(nextFrameData.mRawData, nextFrameData.mRect,
nextFrameData.mPaletteDataLength,
nextFrameData.mHasAlpha,
compositingFrameData.mRawData,
compositingFrameData.mRect,
nextFrameData.mBlendMethod,
nextFrameData.mBlendRect);
// Tell the image that it is fully 'downloaded'.
mCompositingFrame->Finish();
mLastCompositedFrameIndex = int32_t(aNextFrameIndex);
return true;
}
//******************************************************************************
// Fill aFrame with black. Does also clears the mask.
void
FrameAnimator::ClearFrame(uint8_t* aFrameData, const nsIntRect& aFrameRect)
{
if (!aFrameData) {
return;
}
memset(aFrameData, 0, aFrameRect.width * aFrameRect.height * 4);
}
//******************************************************************************
void
FrameAnimator::ClearFrame(uint8_t* aFrameData, const nsIntRect& aFrameRect,
const nsIntRect& aRectToClear)
{
if (!aFrameData || aFrameRect.width <= 0 || aFrameRect.height <= 0 ||
aRectToClear.width <= 0 || aRectToClear.height <= 0) {
return;
}
nsIntRect toClear = aFrameRect.Intersect(aRectToClear);
if (toClear.IsEmpty()) {
return;
}
uint32_t bytesPerRow = aFrameRect.width * 4;
for (int row = toClear.y; row < toClear.y + toClear.height; ++row) {
memset(aFrameData + toClear.x * 4 + row * bytesPerRow, 0,
toClear.width * 4);
}
}
//******************************************************************************
// Whether we succeed or fail will not cause a crash, and there's not much
// we can do about a failure, so there we don't return a nsresult
bool
FrameAnimator::CopyFrameImage(const uint8_t* aDataSrc,
const nsIntRect& aRectSrc,
uint8_t* aDataDest,
const nsIntRect& aRectDest)
{
uint32_t dataLengthSrc = aRectSrc.width * aRectSrc.height * 4;
uint32_t dataLengthDest = aRectDest.width * aRectDest.height * 4;
if (!aDataDest || !aDataSrc || dataLengthSrc != dataLengthDest) {
return false;
}
memcpy(aDataDest, aDataSrc, dataLengthDest);
return true;
}
nsresult
FrameAnimator::DrawFrameTo(const uint8_t* aSrcData, const nsIntRect& aSrcRect,
uint32_t aSrcPaletteLength, bool aSrcHasAlpha,
uint8_t* aDstPixels, const nsIntRect& aDstRect,
BlendMethod aBlendMethod, const Maybe<nsIntRect>& aBlendRect)
{
NS_ENSURE_ARG_POINTER(aSrcData);
NS_ENSURE_ARG_POINTER(aDstPixels);
// According to both AGIF and APNG specs, offsets are unsigned
if (aSrcRect.x < 0 || aSrcRect.y < 0) {
NS_WARNING("FrameAnimator::DrawFrameTo: negative offsets not allowed");
return NS_ERROR_FAILURE;
}
// Outside the destination frame, skip it
if ((aSrcRect.x > aDstRect.width) || (aSrcRect.y > aDstRect.height)) {
return NS_OK;
}
if (aSrcPaletteLength) {
// Larger than the destination frame, clip it
int32_t width = std::min(aSrcRect.width, aDstRect.width - aSrcRect.x);
int32_t height = std::min(aSrcRect.height, aDstRect.height - aSrcRect.y);
// The clipped image must now fully fit within destination image frame
NS_ASSERTION((aSrcRect.x >= 0) && (aSrcRect.y >= 0) &&
(aSrcRect.x + width <= aDstRect.width) &&
(aSrcRect.y + height <= aDstRect.height),
"FrameAnimator::DrawFrameTo: Invalid aSrcRect");
// clipped image size may be smaller than source, but not larger
NS_ASSERTION((width <= aSrcRect.width) && (height <= aSrcRect.height),
"FrameAnimator::DrawFrameTo: source must be smaller than dest");
// Get pointers to image data
const uint8_t* srcPixels = aSrcData + aSrcPaletteLength;
uint32_t* dstPixels = reinterpret_cast<uint32_t*>(aDstPixels);
const uint32_t* colormap = reinterpret_cast<const uint32_t*>(aSrcData);
// Skip to the right offset
dstPixels += aSrcRect.x + (aSrcRect.y * aDstRect.width);
if (!aSrcHasAlpha) {
for (int32_t r = height; r > 0; --r) {
for (int32_t c = 0; c < width; c++) {
dstPixels[c] = colormap[srcPixels[c]];
}
// Go to the next row in the source resp. destination image
srcPixels += aSrcRect.width;
dstPixels += aDstRect.width;
}
} else {
for (int32_t r = height; r > 0; --r) {
for (int32_t c = 0; c < width; c++) {
const uint32_t color = colormap[srcPixels[c]];
if (color) {
dstPixels[c] = color;
}
}
// Go to the next row in the source resp. destination image
srcPixels += aSrcRect.width;
dstPixels += aDstRect.width;
}
}
} else {
pixman_image_t* src =
pixman_image_create_bits(
aSrcHasAlpha ? PIXMAN_a8r8g8b8 : PIXMAN_x8r8g8b8,
aSrcRect.width, aSrcRect.height,
reinterpret_cast<uint32_t*>(const_cast<uint8_t*>(aSrcData)),
aSrcRect.width * 4);
if (!src) {
return NS_ERROR_OUT_OF_MEMORY;
}
pixman_image_t* dst =
pixman_image_create_bits(PIXMAN_a8r8g8b8,
aDstRect.width,
aDstRect.height,
reinterpret_cast<uint32_t*>(aDstPixels),
aDstRect.width * 4);
if (!dst) {
pixman_image_unref(src);
return NS_ERROR_OUT_OF_MEMORY;
}
// XXX(seth): This is inefficient but we'll remove it quite soon when we
// move frame compositing into SurfacePipe. For now we need this because
// RemoveFrameRectFilter has transformed PNG frames with frame rects into
// imgFrame's with no frame rects, but with a region of 0 alpha where the
// frame rect should be. This works really nicely if we're using
// BlendMethod::OVER, but BlendMethod::SOURCE will result in that frame rect
// area overwriting the previous frame, which makes the animation look
// wrong. This quick hack fixes that by first compositing the whle new frame
// with BlendMethod::OVER, and then recopying the area that uses
// BlendMethod::SOURCE if needed. To make this work, the decoder has to
// provide a "blend rect" that tells us where to do this. This is just the
// frame rect, but hidden in a way that makes it invisible to most of the
// system, so we can keep eliminating dependencies on it.
auto op = aBlendMethod == BlendMethod::SOURCE ? PIXMAN_OP_SRC
: PIXMAN_OP_OVER;
if (aBlendMethod == BlendMethod::OVER || !aBlendRect ||
(aBlendMethod == BlendMethod::SOURCE && aSrcRect.IsEqualEdges(*aBlendRect))) {
// We don't need to do anything clever. (Or, in the case where no blend
// rect was specified, we can't.)
pixman_image_composite32(op,
src,
nullptr,
dst,
0, 0,
0, 0,
aSrcRect.x, aSrcRect.y,
aSrcRect.width, aSrcRect.height);
} else {
// We need to do the OVER followed by SOURCE trick above.
pixman_image_composite32(PIXMAN_OP_OVER,
src,
nullptr,
dst,
0, 0,
0, 0,
aSrcRect.x, aSrcRect.y,
aSrcRect.width, aSrcRect.height);
pixman_image_composite32(PIXMAN_OP_SRC,
src,
nullptr,
dst,
aBlendRect->x, aBlendRect->y,
0, 0,
aBlendRect->x, aBlendRect->y,
aBlendRect->width, aBlendRect->height);
}
pixman_image_unref(src);
pixman_image_unref(dst);
}
return NS_OK;
}
} // namespace image
} // namespace mozilla
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку