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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /image/LookupResult.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'image/LookupResult.h')
-rw-r--r--image/LookupResult.h137
1 files changed, 137 insertions, 0 deletions
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+/* -*- 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/. */
+
+/**
+ * LookupResult is the return type of SurfaceCache's Lookup*() functions. It
+ * combines a surface with relevant metadata tracked by SurfaceCache.
+ */
+
+#ifndef mozilla_image_LookupResult_h
+#define mozilla_image_LookupResult_h
+
+#include <utility>
+
+#include "ISurfaceProvider.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/gfx/Point.h" // for IntSize
+
+namespace mozilla {
+namespace image {
+
+enum class MatchType : uint8_t {
+ NOT_FOUND, // No matching surface and no placeholder.
+ PENDING, // Found a matching placeholder, but no surface.
+ EXACT, // Found a surface that matches exactly.
+ SUBSTITUTE_BECAUSE_NOT_FOUND, // No exact match, but found a similar one.
+ SUBSTITUTE_BECAUSE_PENDING, // Found a similar surface and a placeholder
+ // for an exact match.
+
+ /* No exact match, but this should be considered an exact match for purposes
+ * of deciding whether or not to request a new decode. This is because the
+ * cache has determined that callers require too many size variants of this
+ * image. It determines the set of sizes which best represent the image, and
+ * will only suggest decoding of unavailable sizes from that set. */
+ SUBSTITUTE_BECAUSE_BEST
+};
+
+/**
+ * LookupResult is the return type of SurfaceCache's Lookup*() functions. It
+ * combines a surface with relevant metadata tracked by SurfaceCache.
+ */
+class MOZ_STACK_CLASS LookupResult {
+ public:
+ explicit LookupResult(MatchType aMatchType)
+ : mMatchType(aMatchType), mFailedToRequestDecode(false) {
+ MOZ_ASSERT(
+ mMatchType == MatchType::NOT_FOUND || mMatchType == MatchType::PENDING,
+ "Only NOT_FOUND or PENDING make sense with no surface");
+ }
+
+ LookupResult(LookupResult&& aOther)
+ : mSurface(std::move(aOther.mSurface)),
+ mMatchType(aOther.mMatchType),
+ mSuggestedSize(aOther.mSuggestedSize),
+ mFailedToRequestDecode(aOther.mFailedToRequestDecode) {}
+
+ LookupResult(DrawableSurface&& aSurface, MatchType aMatchType)
+ : mSurface(std::move(aSurface)),
+ mMatchType(aMatchType),
+ mFailedToRequestDecode(false) {
+ MOZ_ASSERT(!mSurface || !(mMatchType == MatchType::NOT_FOUND ||
+ mMatchType == MatchType::PENDING),
+ "Only NOT_FOUND or PENDING make sense with no surface");
+ MOZ_ASSERT(mSurface || mMatchType == MatchType::NOT_FOUND ||
+ mMatchType == MatchType::PENDING,
+ "NOT_FOUND or PENDING do not make sense with a surface");
+ }
+
+ LookupResult(MatchType aMatchType, const gfx::IntSize& aSuggestedSize)
+ : mMatchType(aMatchType),
+ mSuggestedSize(aSuggestedSize),
+ mFailedToRequestDecode(false) {
+ MOZ_ASSERT(
+ mMatchType == MatchType::NOT_FOUND || mMatchType == MatchType::PENDING,
+ "Only NOT_FOUND or PENDING make sense with no surface");
+ }
+
+ LookupResult(DrawableSurface&& aSurface, MatchType aMatchType,
+ const gfx::IntSize& aSuggestedSize)
+ : mSurface(std::move(aSurface)),
+ mMatchType(aMatchType),
+ mSuggestedSize(aSuggestedSize),
+ mFailedToRequestDecode(false) {
+ MOZ_ASSERT(!mSurface || !(mMatchType == MatchType::NOT_FOUND ||
+ mMatchType == MatchType::PENDING),
+ "Only NOT_FOUND or PENDING make sense with no surface");
+ MOZ_ASSERT(mSurface || mMatchType == MatchType::NOT_FOUND ||
+ mMatchType == MatchType::PENDING,
+ "NOT_FOUND or PENDING do not make sense with a surface");
+ }
+
+ LookupResult& operator=(LookupResult&& aOther) {
+ MOZ_ASSERT(&aOther != this, "Self-move-assignment is not supported");
+ mSurface = std::move(aOther.mSurface);
+ mMatchType = aOther.mMatchType;
+ mSuggestedSize = aOther.mSuggestedSize;
+ mFailedToRequestDecode = aOther.mFailedToRequestDecode;
+ return *this;
+ }
+
+ DrawableSurface& Surface() { return mSurface; }
+ const DrawableSurface& Surface() const { return mSurface; }
+ const gfx::IntSize& SuggestedSize() const { return mSuggestedSize; }
+
+ /// @return true if this LookupResult contains a surface.
+ explicit operator bool() const { return bool(mSurface); }
+
+ /// @return what kind of match this is (exact, substitute, etc.)
+ MatchType Type() const { return mMatchType; }
+
+ void SetFailedToRequestDecode() { mFailedToRequestDecode = true; }
+ bool GetFailedToRequestDecode() { return mFailedToRequestDecode; }
+
+ private:
+ LookupResult(const LookupResult&) = delete;
+ LookupResult& operator=(const LookupResult& aOther) = delete;
+
+ DrawableSurface mSurface;
+ MatchType mMatchType;
+
+ /// mSuggestedSize will be the size of the returned surface if the result is
+ /// SUBSTITUTE_BECAUSE_BEST. It will be empty for EXACT, and can contain a
+ /// non-empty size possibly different from the returned surface (if any) for
+ /// all other results. If non-empty, it will always be the size the caller
+ /// should request any decodes at.
+ gfx::IntSize mSuggestedSize;
+
+ // True if we tried to start a decode but failed, likely because the image was
+ // too big to fit into the surface cache.
+ bool mFailedToRequestDecode;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_LookupResult_h