зеркало из https://github.com/mozilla/gecko-dev.git
526 строки
20 KiB
C++
526 строки
20 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MobileViewportManager.h"
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#include "gfxPrefs.h"
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#include "LayersLogging.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/dom/Event.h"
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#include "mozilla/dom/EventTarget.h"
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#include "nsIFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsViewManager.h"
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#include "nsViewportInfo.h"
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#include "UnitTransforms.h"
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#include "nsIDocument.h"
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#define MVM_LOG(...)
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// #define MVM_LOG(...) printf_stderr("MVM: " __VA_ARGS__)
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NS_IMPL_ISUPPORTS(MobileViewportManager, nsIDOMEventListener, nsIObserver)
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#define DOM_META_ADDED NS_LITERAL_STRING("DOMMetaAdded")
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#define DOM_META_CHANGED NS_LITERAL_STRING("DOMMetaChanged")
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#define FULL_ZOOM_CHANGE NS_LITERAL_STRING("FullZoomChange")
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#define LOAD NS_LITERAL_STRING("load")
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#define BEFORE_FIRST_PAINT NS_LITERAL_CSTRING("before-first-paint")
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using namespace mozilla;
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using namespace mozilla::layers;
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MobileViewportManager::MobileViewportManager(nsIPresShell* aPresShell,
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nsIDocument* aDocument)
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: mDocument(aDocument),
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mPresShell(aPresShell),
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mIsFirstPaint(false),
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mPainted(false) {
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MOZ_ASSERT(mPresShell);
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MOZ_ASSERT(mDocument);
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MVM_LOG("%p: creating with presShell %p document %p\n", this, mPresShell,
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aDocument);
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if (nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow()) {
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mEventTarget = window->GetChromeEventHandler();
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}
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if (mEventTarget) {
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mEventTarget->AddEventListener(DOM_META_ADDED, this, false);
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mEventTarget->AddEventListener(DOM_META_CHANGED, this, false);
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mEventTarget->AddEventListener(FULL_ZOOM_CHANGE, this, false);
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mEventTarget->AddEventListener(LOAD, this, true);
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}
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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if (observerService) {
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observerService->AddObserver(this, BEFORE_FIRST_PAINT.Data(), false);
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}
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}
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MobileViewportManager::~MobileViewportManager() {}
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void MobileViewportManager::Destroy() {
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MVM_LOG("%p: destroying\n", this);
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if (mEventTarget) {
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mEventTarget->RemoveEventListener(DOM_META_ADDED, this, false);
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mEventTarget->RemoveEventListener(DOM_META_CHANGED, this, false);
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mEventTarget->RemoveEventListener(FULL_ZOOM_CHANGE, this, false);
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mEventTarget->RemoveEventListener(LOAD, this, true);
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mEventTarget = nullptr;
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}
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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if (observerService) {
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observerService->RemoveObserver(this, BEFORE_FIRST_PAINT.Data());
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}
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mDocument = nullptr;
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mPresShell = nullptr;
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}
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void MobileViewportManager::SetRestoreResolution(
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float aResolution, LayoutDeviceIntSize aDisplaySize) {
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SetRestoreResolution(aResolution);
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ScreenIntSize restoreDisplaySize = ViewAs<ScreenPixel>(
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aDisplaySize, PixelCastJustification::LayoutDeviceIsScreenForBounds);
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mRestoreDisplaySize = Some(restoreDisplaySize);
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}
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void MobileViewportManager::SetRestoreResolution(float aResolution) {
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mRestoreResolution = Some(aResolution);
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}
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float MobileViewportManager::ComputeIntrinsicResolution() const {
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ScreenIntSize displaySize = ViewAs<ScreenPixel>(
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mDisplaySize, PixelCastJustification::LayoutDeviceIsScreenForBounds);
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CSSToScreenScale intrinsicScale =
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ComputeIntrinsicScale(mDocument->GetViewportInfo(displaySize),
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displaySize, mMobileViewportSize);
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CSSToLayoutDeviceScale cssToDev =
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mPresShell->GetPresContext()->CSSToDevPixelScale();
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return (intrinsicScale / cssToDev).scale;
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}
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mozilla::CSSToScreenScale MobileViewportManager::ComputeIntrinsicScale(
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const nsViewportInfo& aViewportInfo,
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const mozilla::ScreenIntSize& aDisplaySize,
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const mozilla::CSSSize& aViewportSize) const {
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CSSToScreenScale intrinsicScale =
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MaxScaleRatio(ScreenSize(aDisplaySize), aViewportSize);
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MVM_LOG("%p: Intrinsic computed zoom is %f\n", this, intrinsicScale.scale);
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return ClampZoom(intrinsicScale, aViewportInfo);
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}
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void MobileViewportManager::RequestReflow() {
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MVM_LOG("%p: got a reflow request\n", this);
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RefreshViewportSize(false);
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}
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void MobileViewportManager::ResolutionUpdated() {
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MVM_LOG("%p: resolution updated\n", this);
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if (!mPainted) {
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// Save the value, so our default zoom calculation
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// can take it into account later on.
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SetRestoreResolution(mPresShell->GetResolution());
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}
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RefreshVisualViewportSize();
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}
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NS_IMETHODIMP
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MobileViewportManager::HandleEvent(dom::Event* event) {
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nsAutoString type;
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event->GetType(type);
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if (type.Equals(DOM_META_ADDED)) {
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MVM_LOG("%p: got a dom-meta-added event\n", this);
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RefreshViewportSize(mPainted);
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} else if (type.Equals(DOM_META_CHANGED)) {
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MVM_LOG("%p: got a dom-meta-changed event\n", this);
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RefreshViewportSize(mPainted);
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} else if (type.Equals(FULL_ZOOM_CHANGE)) {
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MVM_LOG("%p: got a full-zoom-change event\n", this);
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RefreshViewportSize(false);
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} else if (type.Equals(LOAD)) {
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MVM_LOG("%p: got a load event\n", this);
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if (!mPainted) {
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// Load event got fired before the before-first-paint message
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SetInitialViewport();
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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MobileViewportManager::Observe(nsISupports* aSubject, const char* aTopic,
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const char16_t* aData) {
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if (SameCOMIdentity(aSubject, mDocument) &&
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BEFORE_FIRST_PAINT.EqualsASCII(aTopic)) {
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MVM_LOG("%p: got a before-first-paint event\n", this);
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if (!mPainted) {
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// before-first-paint message arrived before load event
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SetInitialViewport();
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}
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}
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return NS_OK;
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}
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void MobileViewportManager::SetInitialViewport() {
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MVM_LOG("%p: setting initial viewport\n", this);
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mIsFirstPaint = true;
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mPainted = true;
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RefreshViewportSize(false);
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}
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CSSToScreenScale MobileViewportManager::ClampZoom(
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const CSSToScreenScale& aZoom, const nsViewportInfo& aViewportInfo) const {
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CSSToScreenScale zoom = aZoom;
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if (zoom < aViewportInfo.GetMinZoom()) {
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zoom = aViewportInfo.GetMinZoom();
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MVM_LOG("%p: Clamped to %f\n", this, zoom.scale);
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}
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if (zoom > aViewportInfo.GetMaxZoom()) {
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zoom = aViewportInfo.GetMaxZoom();
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MVM_LOG("%p: Clamped to %f\n", this, zoom.scale);
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}
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return zoom;
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}
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CSSToScreenScale MobileViewportManager::ScaleZoomWithDisplayWidth(
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const CSSToScreenScale& aZoom, const float& aDisplayWidthChangeRatio,
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const CSSSize& aNewViewport, const CSSSize& aOldViewport) {
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float cssViewportChangeRatio = (aOldViewport.width == 0)
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? 1.0f
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: aNewViewport.width / aOldViewport.width;
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CSSToScreenScale newZoom(aZoom.scale * aDisplayWidthChangeRatio /
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cssViewportChangeRatio);
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MVM_LOG("%p: Old zoom was %f, changed by %f/%f to %f\n", this, aZoom.scale,
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aDisplayWidthChangeRatio, cssViewportChangeRatio, newZoom.scale);
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return newZoom;
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}
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static CSSToScreenScale ResolutionToZoom(LayoutDeviceToLayerScale aResolution,
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CSSToLayoutDeviceScale aCssToDev) {
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return ViewTargetAs<ScreenPixel>(
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aCssToDev * aResolution / ParentLayerToLayerScale(1),
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PixelCastJustification::ScreenIsParentLayerForRoot);
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}
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static LayoutDeviceToLayerScale ZoomToResolution(
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CSSToScreenScale aZoom, CSSToLayoutDeviceScale aCssToDev) {
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return ViewTargetAs<ParentLayerPixel>(
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aZoom, PixelCastJustification::ScreenIsParentLayerForRoot) /
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aCssToDev * ParentLayerToLayerScale(1);
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}
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void MobileViewportManager::UpdateResolution(
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const nsViewportInfo& aViewportInfo, const ScreenIntSize& aDisplaySize,
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const CSSSize& aViewportOrContentSize,
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const Maybe<float>& aDisplayWidthChangeRatio, UpdateType aType) {
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CSSToLayoutDeviceScale cssToDev =
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mPresShell->GetPresContext()->CSSToDevPixelScale();
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LayoutDeviceToLayerScale res(mPresShell->GetResolution());
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CSSToScreenScale zoom = ResolutionToZoom(res, cssToDev);
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Maybe<CSSToScreenScale> newZoom;
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ScreenIntSize compositionSize = GetCompositionSize(aDisplaySize);
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CSSToScreenScale intrinsicScale = ComputeIntrinsicScale(
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aViewportInfo, compositionSize, aViewportOrContentSize);
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if (aType == UpdateType::ViewportSize) {
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const CSSSize& viewportSize = aViewportOrContentSize;
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if (mIsFirstPaint) {
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CSSToScreenScale defaultZoom;
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if (mRestoreResolution) {
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LayoutDeviceToLayerScale restoreResolution(mRestoreResolution.value());
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CSSToScreenScale restoreZoom =
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ResolutionToZoom(restoreResolution, cssToDev);
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if (mRestoreDisplaySize) {
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CSSSize prevViewport =
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mDocument->GetViewportInfo(mRestoreDisplaySize.value()).GetSize();
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float restoreDisplayWidthChangeRatio =
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(mRestoreDisplaySize.value().width > 0)
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? (float)compositionSize.width /
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(float)mRestoreDisplaySize.value().width
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: 1.0f;
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restoreZoom = ScaleZoomWithDisplayWidth(
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restoreZoom, restoreDisplayWidthChangeRatio, viewportSize,
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prevViewport);
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}
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defaultZoom = restoreZoom;
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MVM_LOG("%p: restored zoom is %f\n", this, defaultZoom.scale);
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defaultZoom = ClampZoom(defaultZoom, aViewportInfo);
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} else {
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defaultZoom = aViewportInfo.GetDefaultZoom();
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MVM_LOG("%p: default zoom from viewport is %f\n", this,
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defaultZoom.scale);
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if (!aViewportInfo.IsDefaultZoomValid()) {
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defaultZoom = intrinsicScale;
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}
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}
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MOZ_ASSERT(aViewportInfo.GetMinZoom() <= defaultZoom &&
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defaultZoom <= aViewportInfo.GetMaxZoom());
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// On first paint, we always consider the zoom to have changed.
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newZoom = Some(defaultZoom);
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} else {
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// If this is not a first paint, then in some cases we want to update the
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// pre- existing resolution so as to maintain how much actual content is
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// visible within the display width. Note that "actual content" may be
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// different with respect to CSS pixels because of the CSS viewport size
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// changing.
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//
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// aDisplayWidthChangeRatio is non-empty if:
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// (a) The meta-viewport tag information changes, and so the CSS viewport
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// might change as a result. If this happens after the content has
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// been painted, we want to adjust the zoom to compensate. OR
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// (b) The display size changed from a nonzero value to another nonzero
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// value.
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// This covers the case where e.g. the device was rotated, and again
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// we want to adjust the zoom to compensate.
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// Note in particular that aDisplayWidthChangeRatio will be None if all
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// that happened was a change in the full-zoom. In this case, we still
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// want to compute a new CSS viewport, but we don't want to update the
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// resolution.
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//
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// Given the above, the algorithm below accounts for all types of changes
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// I can conceive of:
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// 1. screen size changes, CSS viewport does not (pages with no meta
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// viewport
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// or a fixed size viewport)
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// 2. screen size changes, CSS viewport also does (pages with a
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// device-width
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// viewport)
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// 3. screen size remains constant, but CSS viewport changes (meta
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// viewport
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// tag is added or removed)
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// 4. neither screen size nor CSS viewport changes
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if (aDisplayWidthChangeRatio) {
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newZoom = Some(
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ScaleZoomWithDisplayWidth(zoom, aDisplayWidthChangeRatio.value(),
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viewportSize, mMobileViewportSize));
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}
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}
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} else { // aType == UpdateType::ContentSize
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MOZ_ASSERT(aType == UpdateType::ContentSize);
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MOZ_ASSERT(aDisplayWidthChangeRatio.isNothing());
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// We try to scale down the contents only IF the document has no
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// initial-scale AND IF it's the initial paint AND IF it's not restored
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// documents.
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if (mIsFirstPaint && !mRestoreResolution &&
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!aViewportInfo.IsDefaultZoomValid()) {
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if (zoom != intrinsicScale) {
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newZoom = Some(intrinsicScale);
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}
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} else {
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// Even in other scenarios, we want to ensure that zoom level is
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// not _smaller_ than the intrinsic scale, otherwise we might be
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// trying to show regions where there is no content to show.
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if (zoom < intrinsicScale) {
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newZoom = Some(intrinsicScale);
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}
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}
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}
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// If the zoom has changed, update the pres shell resolution accordingly.
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if (newZoom) {
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LayoutDeviceToLayerScale resolution = ZoomToResolution(*newZoom, cssToDev);
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MVM_LOG("%p: setting resolution %f\n", this, resolution.scale);
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mPresShell->SetResolutionAndScaleTo(resolution.scale);
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MVM_LOG("%p: New zoom is %f\n", this, newZoom->scale);
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}
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// The visual viewport size depends on both the zoom and the display size,
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// and needs to be updated if either might have changed.
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if (newZoom || aType == UpdateType::ViewportSize) {
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UpdateVisualViewportSize(aDisplaySize, newZoom ? *newZoom : zoom);
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}
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}
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ScreenIntSize MobileViewportManager::GetCompositionSize(
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const ScreenIntSize& aDisplaySize) const {
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ScreenIntSize compositionSize(aDisplaySize);
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ScreenMargin scrollbars =
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LayoutDeviceMargin::FromAppUnits(
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nsLayoutUtils::ScrollbarAreaToExcludeFromCompositionBoundsFor(
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mPresShell->GetRootScrollFrame()),
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mPresShell->GetPresContext()->AppUnitsPerDevPixel())
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// Scrollbars are not subject to resolution scaling, so LD pixels =
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// Screen pixels for them.
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* LayoutDeviceToScreenScale(1.0f);
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compositionSize.width -= scrollbars.LeftRight();
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compositionSize.height -= scrollbars.TopBottom();
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return compositionSize;
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}
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void MobileViewportManager::UpdateVisualViewportSize(
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const ScreenIntSize& aDisplaySize, const CSSToScreenScale& aZoom) {
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ScreenSize compositionSize = ScreenSize(GetCompositionSize(aDisplaySize));
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CSSSize compSize = compositionSize / aZoom;
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MVM_LOG("%p: Setting VVPS %s\n", this, Stringify(compSize).c_str());
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nsLayoutUtils::SetVisualViewportSize(mPresShell, compSize);
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}
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void MobileViewportManager::UpdateDisplayPortMargins() {
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if (nsIFrame* root = mPresShell->GetRootScrollFrame()) {
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bool hasDisplayPort = nsLayoutUtils::HasDisplayPort(root->GetContent());
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bool hasResolution =
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mPresShell->ScaleToResolution() && mPresShell->GetResolution() != 1.0f;
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if (!hasDisplayPort && !hasResolution) {
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// We only want to update the displayport if there is one already, or
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// add one if there's a resolution on the document (see bug 1225508
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// comment 1).
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return;
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}
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nsRect displayportBase = nsRect(
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nsPoint(0, 0), nsLayoutUtils::CalculateCompositionSizeForFrame(root));
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// We only create MobileViewportManager for root content documents. If that
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// ever changes we'd need to limit the size of this displayport base rect
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// because non-toplevel documents have no limit on their size.
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MOZ_ASSERT(mPresShell->GetPresContext()->IsRootContentDocument());
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nsLayoutUtils::SetDisplayPortBaseIfNotSet(root->GetContent(),
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displayportBase);
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nsIScrollableFrame* scrollable = do_QueryFrame(root);
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nsLayoutUtils::CalculateAndSetDisplayPortMargins(
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scrollable, nsLayoutUtils::RepaintMode::DoNotRepaint);
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}
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}
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void MobileViewportManager::RefreshVisualViewportSize() {
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// This function is a subset of RefreshViewportSize, and only updates the
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// visual viewport size.
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if (!gfxPrefs::APZAllowZooming()) {
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return;
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}
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ScreenIntSize displaySize = ViewAs<ScreenPixel>(
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mDisplaySize, PixelCastJustification::LayoutDeviceIsScreenForBounds);
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CSSToLayoutDeviceScale cssToDev =
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mPresShell->GetPresContext()->CSSToDevPixelScale();
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LayoutDeviceToLayerScale res(mPresShell->GetResolution());
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CSSToScreenScale zoom = ViewTargetAs<ScreenPixel>(
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cssToDev * res / ParentLayerToLayerScale(1),
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PixelCastJustification::ScreenIsParentLayerForRoot);
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UpdateVisualViewportSize(displaySize, zoom);
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}
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void MobileViewportManager::RefreshViewportSize(bool aForceAdjustResolution) {
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// This function gets called by the various triggers that may result in a
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// change of the CSS viewport. In some of these cases (e.g. the meta-viewport
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// tag changes) we want to update the resolution and in others (e.g. the full
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// zoom changing) we don't want to update the resolution. See the comment in
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// UpdateResolution for some more detail on this. An important assumption we
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// make here is that this RefreshViewportSize function will be called
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// separately for each trigger that changes. For instance it should never get
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// called such that both the full zoom and the meta-viewport tag have changed;
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// instead it would get called twice - once after each trigger changes. This
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// assumption is what allows the aForceAdjustResolution parameter to work as
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// intended; if this assumption is violated then we will need to add extra
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// complicated logic in UpdateResolution to ensure we only do the resolution
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// update in the right scenarios.
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Maybe<float> displayWidthChangeRatio;
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LayoutDeviceIntSize newDisplaySize;
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if (nsLayoutUtils::GetContentViewerSize(mPresShell->GetPresContext(),
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newDisplaySize)) {
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// See the comment in UpdateResolution for why we're doing this.
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if (mDisplaySize.width > 0) {
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if (aForceAdjustResolution ||
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mDisplaySize.width != newDisplaySize.width) {
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displayWidthChangeRatio =
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Some((float)newDisplaySize.width / (float)mDisplaySize.width);
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}
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} else if (aForceAdjustResolution) {
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displayWidthChangeRatio = Some(1.0f);
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}
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MVM_LOG("%p: Display width change ratio is %f\n", this,
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displayWidthChangeRatio.valueOr(0.0f));
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mDisplaySize = newDisplaySize;
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}
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MVM_LOG("%p: Computing CSS viewport using %d,%d\n", this, mDisplaySize.width,
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mDisplaySize.height);
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if (mDisplaySize.width == 0 || mDisplaySize.height == 0) {
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// We can't do anything useful here, we should just bail out
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|
return;
|
|
}
|
|
|
|
ScreenIntSize displaySize = ViewAs<ScreenPixel>(
|
|
mDisplaySize, PixelCastJustification::LayoutDeviceIsScreenForBounds);
|
|
nsViewportInfo viewportInfo = mDocument->GetViewportInfo(displaySize);
|
|
|
|
CSSSize viewport = viewportInfo.GetSize();
|
|
MVM_LOG("%p: Computed CSS viewport %s\n", this, Stringify(viewport).c_str());
|
|
|
|
if (!mIsFirstPaint && mMobileViewportSize == viewport) {
|
|
// Nothing changed, so no need to do a reflow
|
|
return;
|
|
}
|
|
|
|
// If it's the first-paint or the viewport changed, we need to update
|
|
// various APZ properties (the zoom and some things that might depend on it)
|
|
MVM_LOG("%p: Updating properties because %d || %d\n", this, mIsFirstPaint,
|
|
mMobileViewportSize != viewport);
|
|
|
|
if (gfxPrefs::APZAllowZooming()) {
|
|
UpdateResolution(viewportInfo, displaySize, viewport,
|
|
displayWidthChangeRatio, UpdateType::ViewportSize);
|
|
}
|
|
if (gfxPlatform::AsyncPanZoomEnabled()) {
|
|
UpdateDisplayPortMargins();
|
|
}
|
|
|
|
CSSSize oldSize = mMobileViewportSize;
|
|
|
|
// Update internal state.
|
|
mMobileViewportSize = viewport;
|
|
|
|
// Kick off a reflow.
|
|
mPresShell->ResizeReflowIgnoreOverride(
|
|
nsPresContext::CSSPixelsToAppUnits(viewport.width),
|
|
nsPresContext::CSSPixelsToAppUnits(viewport.height),
|
|
nsPresContext::CSSPixelsToAppUnits(oldSize.width),
|
|
nsPresContext::CSSPixelsToAppUnits(oldSize.height));
|
|
|
|
// We are going to fit the content to the display width if the initial-scale
|
|
// is not specied and if the content is still wider than the display width.
|
|
ShrinkToDisplaySizeIfNeeded(viewportInfo, displaySize);
|
|
|
|
mIsFirstPaint = false;
|
|
}
|
|
|
|
void MobileViewportManager::ShrinkToDisplaySizeIfNeeded(
|
|
nsViewportInfo& aViewportInfo, const ScreenIntSize& aDisplaySize) {
|
|
if (!gfxPrefs::APZAllowZooming()) {
|
|
// If the APZ is disabled, we don't scale down wider contents to fit them
|
|
// into device screen because users won't be able to zoom out the tiny
|
|
// contents.
|
|
return;
|
|
}
|
|
|
|
nsIScrollableFrame* rootScrollableFrame =
|
|
mPresShell->GetRootScrollFrameAsScrollable();
|
|
if (rootScrollableFrame) {
|
|
nsRect scrollableRect = nsLayoutUtils::CalculateScrollableRectForFrame(
|
|
rootScrollableFrame, nullptr);
|
|
CSSSize contentSize = CSSSize::FromAppUnits(scrollableRect.Size());
|
|
UpdateResolution(aViewportInfo, aDisplaySize, contentSize, Nothing(),
|
|
UpdateType::ContentSize);
|
|
}
|
|
}
|