SkMultiPictureDocument & SkMultiPictureDocumentReader
also, a new DM::Src.
motivation: To be used to test the printing pipeline in Chromium.
BUG=skia:5370
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2023593002
Review-Url: https://codereview.chromium.org/2023593002
diff --git a/src/utils/SkMultiPictureDocumentReader.cpp b/src/utils/SkMultiPictureDocumentReader.cpp
new file mode 100644
index 0000000..6bc77bf
--- /dev/null
+++ b/src/utils/SkMultiPictureDocumentReader.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkMultiPictureDocumentPriv.h"
+#include "SkMultiPictureDocumentReader.h"
+#include "SkPicture.h"
+#include "SkStream.h"
+
+bool SkMultiPictureDocumentReader::init(SkStreamSeekable* stream) {
+ if (!stream) {
+ return false;
+ }
+ stream->seek(0);
+ const size_t size = sizeof(SkMultiPictureDocumentProtocol::kMagic) - 1;
+ char buffer[size];
+ if (size != stream->read(buffer, size) ||
+ 0 != memcmp(SkMultiPictureDocumentProtocol::kMagic, buffer, size)) {
+ stream = nullptr;
+ return false;
+ }
+ bool good = true;
+ uint32_t versionNumber = stream->readU32();
+ if (versionNumber != 1) {
+ return false;
+ }
+ uint32_t pageCount = stream->readU32();
+ fSizes.reset(pageCount);
+ fOffsets.reset(pageCount);
+ for (uint32_t i = 0; i < pageCount; ++i) {
+ SkMultiPictureDocumentProtocol::Entry entry;
+ good &= sizeof(entry) == stream->read(&entry, sizeof(entry));
+ fSizes[i] = SkSize::Make(entry.sizeX, entry.sizeY);
+ good &= SkTFitsIn<size_t>(entry.offset);
+ fOffsets[i] = static_cast<size_t>(entry.offset);
+ }
+ return good;
+}
+
+sk_sp<SkPicture> SkMultiPictureDocumentReader::readPage(SkStreamSeekable* stream,
+ int pageNumber) const {
+ SkASSERT(pageNumber >= 0);
+ SkASSERT(pageNumber < fOffsets.count());
+ SkAssertResult(stream->seek(fOffsets[pageNumber]));
+ return SkPicture::MakeFromStream(stream);
+}