play with animated gif
Bug: skia:
Change-Id: If86314cda6aa84f4824958cca30cde88a78d4b59
Reviewed-on: https://skia-review.googlesource.com/c/158562
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/src/utils/SkAnimCodecPlayer.cpp b/src/utils/SkAnimCodecPlayer.cpp
new file mode 100644
index 0000000..0a9bbc0
--- /dev/null
+++ b/src/utils/SkAnimCodecPlayer.cpp
@@ -0,0 +1,79 @@
+/*
+ * 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 "SkAnimCodecPlayer.h"
+#include "SkCodec.h"
+#include "SkData.h"
+#include "SkImage.h"
+#include <algorithm>
+
+SkAnimCodecPlayer::SkAnimCodecPlayer(std::unique_ptr<SkCodec> codec) : fCodec(std::move(codec)) {
+ fImageInfo = fCodec->getInfo();
+ fFrameInfos = fCodec->getFrameInfo();
+ fImages.resize(fFrameInfos.size());
+
+ // change the interpretation of fDuration to a end-time for that frame
+ size_t dur = 0;
+ for (auto& f : fFrameInfos) {
+ dur += f.fDuration;
+ f.fDuration = dur;
+ }
+ fTotalDuration = dur;
+}
+
+SkAnimCodecPlayer::~SkAnimCodecPlayer() {}
+
+SkISize SkAnimCodecPlayer::dimensions() {
+ return { fImageInfo.width(), fImageInfo.height() };
+}
+
+sk_sp<SkImage> SkAnimCodecPlayer::getFrameAt(int index) {
+ SkASSERT((unsigned)index < fFrameInfos.size());
+
+ if (fImages[index]) {
+ return fImages[index];
+ }
+
+ size_t rb = fImageInfo.minRowBytes();
+ size_t size = fImageInfo.computeByteSize(rb);
+ auto data = SkData::MakeUninitialized(size);
+
+ SkCodec::Options opts;
+ opts.fFrameIndex = index;
+
+ const int requiredFrame = fFrameInfos[index].fRequiredFrame;
+ if (requiredFrame != SkCodec::kNoFrame) {
+ auto requiredImage = fImages[requiredFrame];
+ SkPixmap requiredPM;
+ if (requiredImage && requiredImage->peekPixels(&requiredPM)) {
+ sk_careful_memcpy(data->writable_data(), requiredPM.addr(), size);
+ opts.fPriorFrame = requiredFrame;
+ }
+ }
+ if (SkCodec::kSuccess == fCodec->getPixels(fImageInfo, data->writable_data(), rb, &opts)) {
+ return fImages[index] = SkImage::MakeRasterData(fImageInfo, std::move(data), rb);
+ }
+ return nullptr;
+}
+
+sk_sp<SkImage> SkAnimCodecPlayer::getFrame() {
+ return this->getFrameAt(fCurrIndex);
+}
+
+bool SkAnimCodecPlayer::seek(uint32_t msec) {
+ msec %= fTotalDuration;
+
+ auto lower = std::lower_bound(fFrameInfos.begin(), fFrameInfos.end(), msec,
+ [](const SkCodec::FrameInfo& info, uint32_t msec) {
+ return (uint32_t)info.fDuration < msec;
+ });
+ int prevIndex = fCurrIndex;
+ fCurrIndex = lower - fFrameInfos.begin();
+ return fCurrIndex != prevIndex;
+}
+
+