1 files changed, 128 insertions, 0 deletions
diff --git a/widget/nsPaper.h b/widget/nsPaper.h
new file mode 100644
index 0000000000..b0117b7306
--- /dev/null
+++ b/widget/nsPaper.h
@@ -0,0 +1,128 @@
+/* -*- Mode: C++; tab-width: 4; 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/. */
+
+#ifndef nsPaper_h__
+#define nsPaper_h__
+
+#include "mozilla/dom/ToJSValue.h"
+#include "mozilla/gfx/Point.h"
+#include "mozilla/gfx/Rect.h"
+#include "mozilla/Maybe.h"
+#include "nsIPaper.h"
+#include "nsISupportsImpl.h"
+#include "js/TypeDecls.h"
+#include "nsString.h"
+
+struct JSContext;
+
+namespace mozilla {
+
+// Simple struct that can be used off the main thread to hold all the info from
+// an nsPaper instance.
+struct PaperInfo {
+  using MarginDouble = mozilla::gfx::MarginDouble;
+  using SizeDouble = mozilla::gfx::SizeDouble;
+
+  PaperInfo() = default;
+  PaperInfo(const nsAString& aId, const nsAString& aName,
+            const SizeDouble& aSize,
+            const Maybe<MarginDouble>& aUnwriteableMargin)
+      : mId(aId),
+        mName(aName),
+        mSize(aSize),
+        mUnwriteableMargin(aUnwriteableMargin) {}
+
+  nsString mId;
+  nsString mName;
+
+  SizeDouble mSize;
+
+  // The margins may not be known by some back-ends.
+  Maybe<MarginDouble> mUnwriteableMargin{Nothing()};
+};
+
+/**
+ * Plain struct used for commonly used, hard-coded paper sizes.
+ *
+ * Used to construct PaperInfo at runtime by localizing the name.
+ */
+struct CommonPaperSize final {
+  // The standardized PWG name, which should be used as the PaperInfo id
+  nsLiteralString mPWGName;
+  // The name key to localize the name of this paper size using strings in
+  // printUI.ftl
+  nsLiteralCString mLocalizableNameKey;
+  // Size is in points, same as PaperInfo
+  gfx::SizeDouble mSize;
+};
+
+}  // namespace mozilla
+
+class nsPrinterBase;
+
+class nsPaper final : public nsIPaper {
+  using Promise = mozilla::dom::Promise;
+  using CommonPaperSize = mozilla::CommonPaperSize;
+
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(nsPaper)
+  NS_DECL_NSIPAPER
+
+  nsPaper() = delete;
+  explicit nsPaper(const mozilla::PaperInfo&);
+  nsPaper(nsPrinterBase&, const mozilla::PaperInfo&);
+
+  // This list is used for both our fallback paper sizes (used when a printer
+  // does not provide a list of available paper sizes), and for localizing
+  // common paper sizes to avoid querying the printer for extra information in
+  // the common case, as well as to provide more uniform paper names in the
+  // frontend.
+  // If we need to separate these two uses, we will need to either split this
+  // into two lists, or add a flag to indicate what the size is used for.
+#define mm *72.0 / 25.4
+#define in *72.0
+  static constexpr CommonPaperSize kCommonPaperSizes[] = {
+      CommonPaperSize{u"iso_a5"_ns, "a5"_ns, {148 mm, 210 mm}},
+      CommonPaperSize{u"iso_a4"_ns, "a4"_ns, {210 mm, 297 mm}},
+      CommonPaperSize{u"iso_a3"_ns, "a3"_ns, {297 mm, 420 mm}},
+      CommonPaperSize{u"iso_b5"_ns, "b5"_ns, {176 mm, 250 mm}},
+      CommonPaperSize{u"iso_b4"_ns, "b4"_ns, {250 mm, 353 mm}},
+      CommonPaperSize{u"jis_b5"_ns, "jis-b5"_ns, {182 mm, 257 mm}},
+      CommonPaperSize{u"jis_b4"_ns, "jis-b4"_ns, {257 mm, 364 mm}},
+      CommonPaperSize{u"na_letter"_ns, "letter"_ns, {8.5 in, 11 in}},
+      CommonPaperSize{u"na_legal"_ns, "legal"_ns, {8.5 in, 14 in}},
+      CommonPaperSize{u"na_ledger"_ns, "tabloid"_ns, {11 in, 17 in}}};
+#undef mm
+#undef in
+  static constexpr size_t kNumCommonPaperSizes =
+      mozilla::ArrayLength(kCommonPaperSizes);
+
+ private:
+  ~nsPaper();
+
+  // null if not associated with a printer (for "Save-to-PDF" paper sizes)
+  RefPtr<nsPrinterBase> mPrinter;
+
+  RefPtr<Promise> mMarginPromise;
+  const mozilla::PaperInfo mInfo;
+};
+
+namespace mozilla {
+
+// Used to allow fixed-sized arrays of PWG paper info to be ref-counted.
+class CommonPaperInfoArray
+    : public Array<PaperInfo, nsPaper::kNumCommonPaperSizes> {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CommonPaperInfoArray);
+  CommonPaperInfoArray() = default;
+
+ private:
+  ~CommonPaperInfoArray() = default;
+};
+
+}  // namespace mozilla
+
+#endif /* nsPaper_h__ */