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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* 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/. */
#include "RemoteLookAndFeel.h"
#include "gfxFont.h"
#include "MainThreadUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/StaticPrefs_widget.h"
#include "mozilla/Try.h"
#include "nsXULAppAPI.h"
#include <limits>
#include <type_traits>
#include <utility>
namespace mozilla::widget {
// A cached copy of the data extracted by ExtractData.
//
// Storing this lets us avoid doing most of the work of ExtractData each
// time we create a new content process.
//
// Only used in the parent process.
static StaticAutoPtr<FullLookAndFeel> sCachedLookAndFeelData;
RemoteLookAndFeel::RemoteLookAndFeel(FullLookAndFeel&& aData)
: mTables(std::move(aData.tables())) {
MOZ_ASSERT(XRE_IsContentProcess(),
"Only content processes should be using a RemoteLookAndFeel");
}
RemoteLookAndFeel::~RemoteLookAndFeel() = default;
void RemoteLookAndFeel::SetDataImpl(FullLookAndFeel&& aData) {
MOZ_ASSERT(XRE_IsContentProcess(),
"Only content processes should be using a RemoteLookAndFeel");
MOZ_ASSERT(NS_IsMainThread());
mTables = std::move(aData.tables());
}
namespace {
// Some lnf values are somewhat expensive to get, and are not needed in child
// processes, so we can avoid querying them.
bool IsNeededInChildProcess(LookAndFeel::IntID aId) {
switch (aId) {
case LookAndFeel::IntID::AlertNotificationOrigin:
return false; // see bug 1703205
default:
return true;
}
}
template <typename Item, typename UInt, typename ID>
Result<const Item*, nsresult> MapLookup(const nsTArray<Item>& aItems,
const nsTArray<UInt>& aMap, ID aID) {
UInt mapped = aMap[static_cast<size_t>(aID)];
if (mapped == std::numeric_limits<UInt>::max()) {
return Err(NS_ERROR_NOT_IMPLEMENTED);
}
return &aItems[static_cast<size_t>(mapped)];
}
template <typename Item, typename UInt, typename Id>
void AddToMap(nsTArray<Item>& aItems, nsTArray<UInt>& aMap, Id aId,
Maybe<Item>&& aNewItem) {
auto mapIndex = size_t(aId);
aMap.EnsureLengthAtLeast(mapIndex + 1);
if (aNewItem.isNothing()) {
aMap[mapIndex] = std::numeric_limits<UInt>::max();
return;
}
size_t newIndex = aItems.Length();
MOZ_ASSERT(newIndex < std::numeric_limits<UInt>::max());
// Check if there is an existing value in aItems that we can point to.
//
// The arrays should be small enough and contain few enough unique
// values that sequential search here is reasonable.
for (size_t i = 0; i < newIndex; ++i) {
if (aItems[i] == aNewItem.ref()) {
aMap[mapIndex] = static_cast<UInt>(i);
return;
}
}
aItems.AppendElement(aNewItem.extract());
aMap[mapIndex] = static_cast<UInt>(newIndex);
}
} // namespace
nsresult RemoteLookAndFeel::NativeGetColor(ColorID aID, ColorScheme aScheme,
nscolor& aResult) {
const nscolor* result;
const bool dark = aScheme == ColorScheme::Dark;
MOZ_TRY_VAR(
result,
MapLookup(dark ? mTables.darkColors() : mTables.lightColors(),
dark ? mTables.darkColorMap() : mTables.lightColorMap(), aID));
aResult = *result;
return NS_OK;
}
nsresult RemoteLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
MOZ_DIAGNOSTIC_ASSERT(
IsNeededInChildProcess(aID),
"Querying value that we didn't bother getting from the parent process!");
const int32_t* result;
MOZ_TRY_VAR(result, MapLookup(mTables.ints(), mTables.intMap(), aID));
aResult = *result;
return NS_OK;
}
nsresult RemoteLookAndFeel::NativeGetFloat(FloatID aID, float& aResult) {
const float* result;
MOZ_TRY_VAR(result, MapLookup(mTables.floats(), mTables.floatMap(), aID));
aResult = *result;
return NS_OK;
}
bool RemoteLookAndFeel::NativeGetFont(FontID aID, nsString& aFontName,
gfxFontStyle& aFontStyle) {
auto result = MapLookup(mTables.fonts(), mTables.fontMap(), aID);
if (result.isErr()) {
return false;
}
const LookAndFeelFont& font = *result.unwrap();
return LookAndFeelFontToStyle(font, aFontName, aFontStyle);
}
char16_t RemoteLookAndFeel::GetPasswordCharacterImpl() {
return static_cast<char16_t>(mTables.passwordChar());
}
bool RemoteLookAndFeel::GetEchoPasswordImpl() { return mTables.passwordEcho(); }
static bool AddIDsToMap(nsXPLookAndFeel* aImpl, FullLookAndFeel* aLf) {
using IntID = LookAndFeel::IntID;
using FontID = LookAndFeel::FontID;
using FloatID = LookAndFeel::FloatID;
using ColorID = LookAndFeel::ColorID;
using ColorScheme = LookAndFeel::ColorScheme;
bool anyFromOtherTheme = false;
for (auto id : MakeEnumeratedRange(IntID::End)) {
if (!IsNeededInChildProcess(id)) {
continue;
}
int32_t theInt;
nsresult rv = aImpl->NativeGetInt(id, theInt);
AddToMap(aLf->tables().ints(), aLf->tables().intMap(), id,
NS_SUCCEEDED(rv) ? Some(theInt) : Nothing{});
}
for (auto id : MakeEnumeratedRange(ColorID::End)) {
nscolor theColor;
nsresult rv = aImpl->NativeGetColor(id, ColorScheme::Light, theColor);
AddToMap(aLf->tables().lightColors(), aLf->tables().lightColorMap(), id,
NS_SUCCEEDED(rv) ? Some(theColor) : Nothing{});
rv = aImpl->NativeGetColor(id, ColorScheme::Dark, theColor);
AddToMap(aLf->tables().darkColors(), aLf->tables().darkColorMap(), id,
NS_SUCCEEDED(rv) ? Some(theColor) : Nothing{});
}
for (auto id : MakeEnumeratedRange(FloatID::End)) {
float theFloat;
nsresult rv = aImpl->NativeGetFloat(id, theFloat);
AddToMap(aLf->tables().floats(), aLf->tables().floatMap(), id,
NS_SUCCEEDED(rv) ? Some(theFloat) : Nothing{});
}
for (auto id : MakeEnumeratedRange(FontID::End)) {
gfxFontStyle fontStyle{};
nsString name;
bool rv = aImpl->NativeGetFont(id, name, fontStyle);
Maybe<LookAndFeelFont> maybeFont;
if (rv) {
maybeFont.emplace(
nsXPLookAndFeel::StyleToLookAndFeelFont(name, fontStyle));
}
AddToMap(aLf->tables().fonts(), aLf->tables().fontMap(), id,
std::move(maybeFont));
}
return anyFromOtherTheme;
}
// static
const FullLookAndFeel* RemoteLookAndFeel::ExtractData() {
MOZ_ASSERT(XRE_IsParentProcess(),
"Only parent processes should be extracting LookAndFeel data");
if (sCachedLookAndFeelData) {
return sCachedLookAndFeelData;
}
static bool sInitialized = false;
if (!sInitialized) {
sInitialized = true;
ClearOnShutdown(&sCachedLookAndFeelData);
}
FullLookAndFeel* lf = new FullLookAndFeel{};
nsXPLookAndFeel* impl = nsXPLookAndFeel::GetInstance();
lf->tables().passwordChar() = impl->GetPasswordCharacterImpl();
lf->tables().passwordEcho() = impl->GetEchoPasswordImpl();
AddIDsToMap(impl, lf);
// This assignment to sCachedLookAndFeelData must be done after the
// WithThemeConfiguredForContent call, since it can end up calling RefreshImpl
// on the LookAndFeel, which will clear out sCachedTables.
sCachedLookAndFeelData = lf;
return sCachedLookAndFeelData;
}
void RemoteLookAndFeel::ClearCachedData() {
MOZ_ASSERT(XRE_IsParentProcess());
sCachedLookAndFeelData = nullptr;
}
} // namespace mozilla::widget
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