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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkAndroidCodec.h"
#include "SkAnimatedImage.h"
#include "SkCanvas.h"
#include "SkCodec.h"
#include "SkCodecPriv.h"
#include "SkImagePriv.h"
#include "SkPicture.h"
#include "SkPictureRecorder.h"
#include "SkPixelRef.h"
#include <utility>
sk_sp<SkAnimatedImage> SkAnimatedImage::Make(std::unique_ptr<SkAndroidCodec> codec,
SkISize scaledSize, SkIRect cropRect, sk_sp<SkPicture> postProcess) {
if (!codec) {
return nullptr;
}
SkISize decodeSize = scaledSize;
auto decodeInfo = codec->getInfo();
if (codec->getEncodedFormat() == SkEncodedImageFormat::kWEBP
&& scaledSize.width() < decodeInfo.width()
&& scaledSize.height() < decodeInfo.height()) {
// libwebp can decode to arbitrary smaller sizes.
decodeInfo = decodeInfo.makeWH(decodeSize.width(), decodeSize.height());
}
auto image = sk_sp<SkAnimatedImage>(new SkAnimatedImage(std::move(codec), scaledSize,
decodeInfo, cropRect, std::move(postProcess)));
if (!image->fDisplayFrame.fBitmap.getPixels()) {
// tryAllocPixels failed.
return nullptr;
}
return image;
}
sk_sp<SkAnimatedImage> SkAnimatedImage::Make(std::unique_ptr<SkAndroidCodec> codec) {
if (!codec) {
return nullptr;
}
const auto decodeInfo = codec->getInfo();
const auto scaledSize = decodeInfo.dimensions();
const auto cropRect = SkIRect::MakeSize(scaledSize);
auto image = sk_sp<SkAnimatedImage>(new SkAnimatedImage(std::move(codec), scaledSize,
decodeInfo, cropRect, nullptr));
if (!image->fDisplayFrame.fBitmap.getPixels()) {
// tryAllocPixels failed.
return nullptr;
}
SkASSERT(image->fSimple);
return image;
}
SkAnimatedImage::SkAnimatedImage(std::unique_ptr<SkAndroidCodec> codec, SkISize scaledSize,
SkImageInfo decodeInfo, SkIRect cropRect, sk_sp<SkPicture> postProcess)
: fCodec(std::move(codec))
, fScaledSize(scaledSize)
, fDecodeInfo(decodeInfo)
, fCropRect(cropRect)
, fPostProcess(std::move(postProcess))
, fFrameCount(fCodec->codec()->getFrameCount())
, fSimple(fScaledSize == fDecodeInfo.dimensions() && !fPostProcess
&& fCropRect == fDecodeInfo.bounds())
, fFinished(false)
, fRepetitionCount(fCodec->codec()->getRepetitionCount())
, fRepetitionsCompleted(0)
{
if (!fDecodingFrame.fBitmap.tryAllocPixels(fDecodeInfo)) {
return;
}
if (!fSimple) {
fMatrix = SkMatrix::MakeTrans(-fCropRect.fLeft, -fCropRect.fTop);
float scaleX = (float) fScaledSize.width() / fDecodeInfo.width();
float scaleY = (float) fScaledSize.height() / fDecodeInfo.height();
fMatrix.preConcat(SkMatrix::MakeScale(scaleX, scaleY));
}
this->decodeNextFrame();
}
SkAnimatedImage::~SkAnimatedImage() { }
SkRect SkAnimatedImage::onGetBounds() {
return SkRect::MakeIWH(fCropRect.width(), fCropRect.height());
}
SkAnimatedImage::Frame::Frame()
: fIndex(SkCodec::kNoFrame)
{}
bool SkAnimatedImage::Frame::init(const SkImageInfo& info, OnInit onInit) {
if (fBitmap.getPixels()) {
if (fBitmap.pixelRef()->unique()) {
SkAssertResult(fBitmap.setAlphaType(info.alphaType()));
return true;
}
// An SkCanvas provided to onDraw is still holding a reference.
// Copy before we decode to ensure that we don't overwrite the
// expected contents of the image.
if (OnInit::kRestoreIfNecessary == onInit) {
SkBitmap tmp;
if (!tmp.tryAllocPixels(info)) {
return false;
}
memcpy(tmp.getPixels(), fBitmap.getPixels(), fBitmap.computeByteSize());
using std::swap;
swap(tmp, fBitmap);
return true;
}
}
return fBitmap.tryAllocPixels(info);
}
bool SkAnimatedImage::Frame::copyTo(Frame* dst) const {
if (!dst->init(fBitmap.info(), OnInit::kNoRestore)) {
return false;
}
memcpy(dst->fBitmap.getPixels(), fBitmap.getPixels(), fBitmap.computeByteSize());
dst->fIndex = fIndex;
dst->fDisposalMethod = fDisposalMethod;
return true;
}
void SkAnimatedImage::reset() {
fFinished = false;
fRepetitionsCompleted = 0;
if (fDisplayFrame.fIndex != 0) {
fDisplayFrame.fIndex = SkCodec::kNoFrame;
this->decodeNextFrame();
}
}
static bool is_restore_previous(SkCodecAnimation::DisposalMethod dispose) {
return SkCodecAnimation::DisposalMethod::kRestorePrevious == dispose;
}
int SkAnimatedImage::computeNextFrame(int current, bool* animationEnded) {
SkASSERT(animationEnded != nullptr);
*animationEnded = false;
const int frameToDecode = current + 1;
if (frameToDecode == fFrameCount - 1) {
// Final frame. Check to determine whether to stop.
fRepetitionsCompleted++;
if (fRepetitionCount != SkCodec::kRepetitionCountInfinite
&& fRepetitionsCompleted > fRepetitionCount) {
*animationEnded = true;
}
} else if (frameToDecode == fFrameCount) {
return 0;
}
return frameToDecode;
}
double SkAnimatedImage::finish() {
fFinished = true;
fCurrentFrameDuration = kFinished;
return kFinished;
}
int SkAnimatedImage::decodeNextFrame() {
if (fFinished) {
return kFinished;
}
bool animationEnded = false;
int frameToDecode = this->computeNextFrame(fDisplayFrame.fIndex, &animationEnded);
SkCodec::FrameInfo frameInfo;
if (fCodec->codec()->getFrameInfo(frameToDecode, &frameInfo)) {
if (!frameInfo.fFullyReceived) {
SkCodecPrintf("Frame %i not fully received\n", frameToDecode);
return this->finish();
}
fCurrentFrameDuration = frameInfo.fDuration;
} else {
animationEnded = true;
if (0 == frameToDecode) {
// Static image. This is okay.
frameInfo.fRequiredFrame = SkCodec::kNoFrame;
frameInfo.fAlphaType = fCodec->getInfo().alphaType();
frameInfo.fDisposalMethod = SkCodecAnimation::DisposalMethod::kKeep;
// These fields won't be read.
frameInfo.fDuration = INT_MAX;
frameInfo.fFullyReceived = true;
fCurrentFrameDuration = kFinished;
} else {
SkCodecPrintf("Error getting frameInfo for frame %i\n",
frameToDecode);
return this->finish();
}
}
if (frameToDecode == fDisplayFrame.fIndex) {
if (animationEnded) {
return this->finish();
}
return fCurrentFrameDuration;
}
for (Frame* frame : { &fRestoreFrame, &fDecodingFrame }) {
if (frameToDecode == frame->fIndex) {
using std::swap;
swap(fDisplayFrame, *frame);
if (animationEnded) {
return this->finish();
}
return fCurrentFrameDuration;
}
}
// The following code makes an effort to avoid overwriting a frame that will
// be used again. If frame |i| is_restore_previous, frame |i+1| will not
// depend on frame |i|, so do not overwrite frame |i-1|, which may be needed
// for frame |i+1|.
// We could be even smarter about which frames to save by looking at the
// entire dependency chain.
SkCodec::Options options;
options.fFrameIndex = frameToDecode;
if (frameInfo.fRequiredFrame == SkCodec::kNoFrame) {
if (is_restore_previous(frameInfo.fDisposalMethod)) {
// frameToDecode will be discarded immediately after drawing, so
// do not overwrite a frame which could possibly be used in the
// future.
if (fDecodingFrame.fIndex != SkCodec::kNoFrame &&
!is_restore_previous(fDecodingFrame.fDisposalMethod)) {
using std::swap;
swap(fDecodingFrame, fRestoreFrame);
}
}
} else {
auto validPriorFrame = [&frameInfo, &frameToDecode](const Frame& frame) {
if (SkCodec::kNoFrame == frame.fIndex ||
is_restore_previous(frame.fDisposalMethod)) {
return false;
}
return frame.fIndex >= frameInfo.fRequiredFrame && frame.fIndex < frameToDecode;
};
if (validPriorFrame(fDecodingFrame)) {
if (is_restore_previous(frameInfo.fDisposalMethod)) {
// fDecodingFrame is a good frame to use for this one, but we
// don't want to overwrite it.
fDecodingFrame.copyTo(&fRestoreFrame);
}
options.fPriorFrame = fDecodingFrame.fIndex;
} else if (validPriorFrame(fDisplayFrame)) {
if (!fDisplayFrame.copyTo(&fDecodingFrame)) {
SkCodecPrintf("Failed to allocate pixels for frame\n");
return this->finish();
}
options.fPriorFrame = fDecodingFrame.fIndex;
} else if (validPriorFrame(fRestoreFrame)) {
if (!is_restore_previous(frameInfo.fDisposalMethod)) {
using std::swap;
swap(fDecodingFrame, fRestoreFrame);
} else if (!fRestoreFrame.copyTo(&fDecodingFrame)) {
SkCodecPrintf("Failed to restore frame\n");
return this->finish();
}
options.fPriorFrame = fDecodingFrame.fIndex;
}
}
auto alphaType = kOpaque_SkAlphaType == frameInfo.fAlphaType ?
kOpaque_SkAlphaType : kPremul_SkAlphaType;
auto info = fDecodeInfo.makeAlphaType(alphaType);
SkBitmap* dst = &fDecodingFrame.fBitmap;
if (!fDecodingFrame.init(info, Frame::OnInit::kRestoreIfNecessary)) {
return this->finish();
}
auto result = fCodec->codec()->getPixels(dst->info(), dst->getPixels(), dst->rowBytes(),
&options);
if (result != SkCodec::kSuccess) {
SkCodecPrintf("error %i, frame %i of %i\n", result, frameToDecode, fFrameCount);
return this->finish();
}
fDecodingFrame.fIndex = frameToDecode;
fDecodingFrame.fDisposalMethod = frameInfo.fDisposalMethod;
using std::swap;
swap(fDecodingFrame, fDisplayFrame);
fDisplayFrame.fBitmap.notifyPixelsChanged();
if (animationEnded) {
return this->finish();
}
return fCurrentFrameDuration;
}
void SkAnimatedImage::onDraw(SkCanvas* canvas) {
auto image = SkMakeImageFromRasterBitmap(fDisplayFrame.fBitmap,
kNever_SkCopyPixelsMode);
if (fSimple) {
canvas->drawImage(image, 0, 0);
return;
}
SkRect bounds = this->getBounds();
if (fPostProcess) {
canvas->saveLayer(&bounds, nullptr);
}
{
SkAutoCanvasRestore acr(canvas, fPostProcess != nullptr);
canvas->concat(fMatrix);
SkPaint paint;
paint.setFilterQuality(kLow_SkFilterQuality);
canvas->drawImage(image, 0, 0, &paint);
}
if (fPostProcess) {
canvas->drawPicture(fPostProcess);
canvas->restore();
}
}
void SkAnimatedImage::setRepetitionCount(int newCount) {
fRepetitionCount = newCount;
}