497d7f2846
The "default" case in EnumerationToLength() is not needed anymore because StyleShapeRadius is an enum class, which cannot have other values. MozReview-Commit-ID: GHkPAXXxqGZ
385 lines
15 KiB
C++
385 lines
15 KiB
C++
/* -*- 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/. */
|
||
|
||
// Main header first:
|
||
#include "nsCSSClipPathInstance.h"
|
||
|
||
#include "gfx2DGlue.h"
|
||
#include "gfxPlatform.h"
|
||
#include "mozilla/dom/SVGSVGElement.h"
|
||
#include "mozilla/gfx/2D.h"
|
||
#include "mozilla/gfx/PathHelpers.h"
|
||
#include "nsCSSRendering.h"
|
||
#include "nsIFrame.h"
|
||
#include "nsMathUtils.h"
|
||
#include "nsRenderingContext.h"
|
||
#include "nsRuleNode.h"
|
||
#include "nsSVGElement.h"
|
||
#include "nsSVGUtils.h"
|
||
#include "nsSVGViewBox.h"
|
||
|
||
using namespace mozilla;
|
||
using namespace mozilla::dom;
|
||
using namespace mozilla::gfx;
|
||
|
||
/* static*/ void
|
||
nsCSSClipPathInstance::ApplyBasicShapeClip(gfxContext& aContext,
|
||
nsIFrame* aFrame)
|
||
{
|
||
auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
|
||
|
||
#ifdef DEBUG
|
||
StyleShapeSourceType type = clipPathStyle.GetType();
|
||
MOZ_ASSERT(type == StyleShapeSourceType::Shape ||
|
||
type == StyleShapeSourceType::Box,
|
||
"This function is used with basic-shape and geometry-box only.");
|
||
#endif
|
||
|
||
nsCSSClipPathInstance instance(aFrame, clipPathStyle);
|
||
|
||
aContext.NewPath();
|
||
RefPtr<Path> path = instance.CreateClipPath(aContext.GetDrawTarget());
|
||
aContext.SetPath(path);
|
||
aContext.Clip();
|
||
}
|
||
|
||
/* static*/ bool
|
||
nsCSSClipPathInstance::HitTestBasicShapeClip(nsIFrame* aFrame,
|
||
const gfxPoint& aPoint)
|
||
{
|
||
auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
|
||
StyleShapeSourceType type = clipPathStyle.GetType();
|
||
MOZ_ASSERT(type != StyleShapeSourceType::None, "unexpected none value");
|
||
// In the future nsCSSClipPathInstance may handle <clipPath> references as
|
||
// well. For the time being return early.
|
||
if (type == StyleShapeSourceType::URL) {
|
||
return false;
|
||
}
|
||
|
||
nsCSSClipPathInstance instance(aFrame, clipPathStyle);
|
||
|
||
RefPtr<DrawTarget> drawTarget =
|
||
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
|
||
RefPtr<Path> path = instance.CreateClipPath(drawTarget);
|
||
float pixelRatio = float(nsPresContext::AppUnitsPerCSSPixel()) /
|
||
aFrame->PresContext()->AppUnitsPerDevPixel();
|
||
return path->ContainsPoint(ToPoint(aPoint) * pixelRatio, Matrix());
|
||
}
|
||
|
||
nsRect
|
||
nsCSSClipPathInstance::ComputeSVGReferenceRect()
|
||
{
|
||
MOZ_ASSERT(mTargetFrame->GetContent()->IsSVGElement());
|
||
nsRect r;
|
||
|
||
// For SVG elements without associated CSS layout box, the used value for
|
||
// content-box, padding-box, border-box and margin-box is fill-box.
|
||
switch (mClipPathStyle.GetReferenceBox()) {
|
||
case StyleClipPathGeometryBox::Stroke: {
|
||
// XXX Bug 1299876
|
||
// The size of srtoke-box is not correct if this graphic element has
|
||
// specific stroke-linejoin or stroke-linecap.
|
||
gfxRect bbox = nsSVGUtils::GetBBox(mTargetFrame,
|
||
nsSVGUtils::eBBoxIncludeFill | nsSVGUtils::eBBoxIncludeStroke);
|
||
r = nsLayoutUtils::RoundGfxRectToAppRect(bbox,
|
||
nsPresContext::AppUnitsPerCSSPixel());
|
||
break;
|
||
}
|
||
case StyleClipPathGeometryBox::View: {
|
||
nsIContent* content = mTargetFrame->GetContent();
|
||
nsSVGElement* element = static_cast<nsSVGElement*>(content);
|
||
SVGSVGElement* svgElement = element->GetCtx();
|
||
MOZ_ASSERT(svgElement);
|
||
|
||
if (svgElement && svgElement->HasViewBoxRect()) {
|
||
// If a ‘viewBox‘ attribute is specified for the SVG viewport creating
|
||
// element:
|
||
// 1. The reference box is positioned at the origin of the coordinate
|
||
// system established by the ‘viewBox‘ attribute.
|
||
// 2. The dimension of the reference box is set to the width and height
|
||
// values of the ‘viewBox‘ attribute.
|
||
nsSVGViewBox* viewBox = svgElement->GetViewBox();
|
||
const nsSVGViewBoxRect& value = viewBox->GetAnimValue();
|
||
r = nsRect(nsPresContext::CSSPixelsToAppUnits(value.x),
|
||
nsPresContext::CSSPixelsToAppUnits(value.y),
|
||
nsPresContext::CSSPixelsToAppUnits(value.width),
|
||
nsPresContext::CSSPixelsToAppUnits(value.height));
|
||
} else {
|
||
// No viewBox is specified, uses the nearest SVG viewport as reference
|
||
// box.
|
||
svgFloatSize viewportSize = svgElement->GetViewportSize();
|
||
r = nsRect(0, 0,
|
||
nsPresContext::CSSPixelsToAppUnits(viewportSize.width),
|
||
nsPresContext::CSSPixelsToAppUnits(viewportSize.height));
|
||
}
|
||
|
||
break;
|
||
}
|
||
case StyleClipPathGeometryBox::NoBox:
|
||
case StyleClipPathGeometryBox::Border:
|
||
case StyleClipPathGeometryBox::Content:
|
||
case StyleClipPathGeometryBox::Padding:
|
||
case StyleClipPathGeometryBox::Margin:
|
||
case StyleClipPathGeometryBox::Fill: {
|
||
gfxRect bbox = nsSVGUtils::GetBBox(mTargetFrame,
|
||
nsSVGUtils::eBBoxIncludeFill);
|
||
r = nsLayoutUtils::RoundGfxRectToAppRect(bbox,
|
||
nsPresContext::AppUnitsPerCSSPixel());
|
||
break;
|
||
}
|
||
default:{
|
||
MOZ_ASSERT_UNREACHABLE("unknown StyleClipPathGeometryBox type");
|
||
gfxRect bbox = nsSVGUtils::GetBBox(mTargetFrame,
|
||
nsSVGUtils::eBBoxIncludeFill);
|
||
r = nsLayoutUtils::RoundGfxRectToAppRect(bbox,
|
||
nsPresContext::AppUnitsPerCSSPixel());
|
||
break;
|
||
}
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
nsRect
|
||
nsCSSClipPathInstance::ComputeHTMLReferenceRect()
|
||
{
|
||
nsRect r;
|
||
|
||
// For elements with associated CSS layout box, the used value for fill-box,
|
||
// stroke-box and view-box is border-box.
|
||
switch (mClipPathStyle.GetReferenceBox()) {
|
||
case StyleClipPathGeometryBox::Content:
|
||
r = mTargetFrame->GetContentRectRelativeToSelf();
|
||
break;
|
||
case StyleClipPathGeometryBox::Padding:
|
||
r = mTargetFrame->GetPaddingRectRelativeToSelf();
|
||
break;
|
||
case StyleClipPathGeometryBox::Margin:
|
||
r = mTargetFrame->GetMarginRectRelativeToSelf();
|
||
break;
|
||
case StyleClipPathGeometryBox::NoBox:
|
||
case StyleClipPathGeometryBox::Border:
|
||
case StyleClipPathGeometryBox::Fill:
|
||
case StyleClipPathGeometryBox::Stroke:
|
||
case StyleClipPathGeometryBox::View:
|
||
r = mTargetFrame->GetRectRelativeToSelf();
|
||
break;
|
||
default:
|
||
MOZ_ASSERT_UNREACHABLE("unknown StyleClipPathGeometryBox type");
|
||
r = mTargetFrame->GetRectRelativeToSelf();
|
||
break;
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
already_AddRefed<Path>
|
||
nsCSSClipPathInstance::CreateClipPath(DrawTarget* aDrawTarget)
|
||
{
|
||
// We use ComputeSVGReferenceRect for all SVG elements, except <svg>
|
||
// element, which does have an associated CSS layout box. In this case we
|
||
// should still use ComputeHTMLReferenceRect for region computing.
|
||
nsRect r = mTargetFrame->IsFrameOfType(nsIFrame::eSVG) &&
|
||
(mTargetFrame->GetType() != nsGkAtoms::svgOuterSVGFrame)
|
||
? ComputeSVGReferenceRect() : ComputeHTMLReferenceRect();
|
||
|
||
if (mClipPathStyle.GetType() != StyleShapeSourceType::Shape) {
|
||
// TODO Clip to border-radius/reference box if no shape
|
||
// was specified.
|
||
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
|
||
return builder->Finish();
|
||
}
|
||
|
||
nscoord appUnitsPerDevPixel =
|
||
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
|
||
r = ToAppUnits(r.ToNearestPixels(appUnitsPerDevPixel), appUnitsPerDevPixel);
|
||
|
||
StyleBasicShape* basicShape = mClipPathStyle.GetBasicShape();
|
||
switch (basicShape->GetShapeType()) {
|
||
case StyleBasicShapeType::Circle:
|
||
return CreateClipPathCircle(aDrawTarget, r);
|
||
case StyleBasicShapeType::Ellipse:
|
||
return CreateClipPathEllipse(aDrawTarget, r);
|
||
case StyleBasicShapeType::Polygon:
|
||
return CreateClipPathPolygon(aDrawTarget, r);
|
||
case StyleBasicShapeType::Inset:
|
||
return CreateClipPathInset(aDrawTarget, r);
|
||
break;
|
||
default:
|
||
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected shape type");
|
||
}
|
||
// Return an empty Path:
|
||
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
|
||
return builder->Finish();
|
||
}
|
||
|
||
static void
|
||
EnumerationToLength(nscoord& aCoord, StyleShapeRadius aType,
|
||
nscoord aCenter, nscoord aPosMin, nscoord aPosMax)
|
||
{
|
||
nscoord dist1 = abs(aPosMin - aCenter);
|
||
nscoord dist2 = abs(aPosMax - aCenter);
|
||
switch (aType) {
|
||
case StyleShapeRadius::FarthestSide:
|
||
aCoord = dist1 > dist2 ? dist1 : dist2;
|
||
break;
|
||
case StyleShapeRadius::ClosestSide:
|
||
aCoord = dist1 > dist2 ? dist2 : dist1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
already_AddRefed<Path>
|
||
nsCSSClipPathInstance::CreateClipPathCircle(DrawTarget* aDrawTarget,
|
||
const nsRect& aRefBox)
|
||
{
|
||
StyleBasicShape* basicShape = mClipPathStyle.GetBasicShape();
|
||
|
||
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
|
||
|
||
nsPoint topLeft, anchor;
|
||
nsSize size = nsSize(aRefBox.width, aRefBox.height);
|
||
nsImageRenderer::ComputeObjectAnchorPoint(basicShape->GetPosition(),
|
||
size, size,
|
||
&topLeft, &anchor);
|
||
Point center = Point(anchor.x + aRefBox.x, anchor.y + aRefBox.y);
|
||
|
||
const nsTArray<nsStyleCoord>& coords = basicShape->Coordinates();
|
||
MOZ_ASSERT(coords.Length() == 1, "wrong number of arguments");
|
||
nscoord r = 0;
|
||
if (coords[0].GetUnit() == eStyleUnit_Enumerated) {
|
||
const auto styleShapeRadius = coords[0].GetEnumValue<StyleShapeRadius>();
|
||
nscoord horizontal, vertical;
|
||
EnumerationToLength(horizontal, styleShapeRadius,
|
||
center.x, aRefBox.x, aRefBox.x + aRefBox.width);
|
||
EnumerationToLength(vertical, styleShapeRadius,
|
||
center.y, aRefBox.y, aRefBox.y + aRefBox.height);
|
||
if (styleShapeRadius == StyleShapeRadius::FarthestSide) {
|
||
r = horizontal > vertical ? horizontal : vertical;
|
||
} else {
|
||
r = horizontal < vertical ? horizontal : vertical;
|
||
}
|
||
} else {
|
||
// We resolve percent <shape-radius> value for circle() as defined here:
|
||
// https://drafts.csswg.org/css-shapes/#funcdef-circle
|
||
const double sqrt2 = std::sqrt(2.0);
|
||
double referenceLength = NS_hypot(aRefBox.width, aRefBox.height) / sqrt2;
|
||
r = nsRuleNode::ComputeCoordPercentCalc(coords[0],
|
||
NSToCoordRound(referenceLength));
|
||
}
|
||
|
||
nscoord appUnitsPerDevPixel =
|
||
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
|
||
builder->Arc(center / appUnitsPerDevPixel, r / appUnitsPerDevPixel,
|
||
0, Float(2 * M_PI));
|
||
builder->Close();
|
||
return builder->Finish();
|
||
}
|
||
|
||
already_AddRefed<Path>
|
||
nsCSSClipPathInstance::CreateClipPathEllipse(DrawTarget* aDrawTarget,
|
||
const nsRect& aRefBox)
|
||
{
|
||
StyleBasicShape* basicShape = mClipPathStyle.GetBasicShape();
|
||
|
||
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
|
||
|
||
nsPoint topLeft, anchor;
|
||
nsSize size = nsSize(aRefBox.width, aRefBox.height);
|
||
nsImageRenderer::ComputeObjectAnchorPoint(basicShape->GetPosition(),
|
||
size, size,
|
||
&topLeft, &anchor);
|
||
Point center = Point(anchor.x + aRefBox.x, anchor.y + aRefBox.y);
|
||
|
||
const nsTArray<nsStyleCoord>& coords = basicShape->Coordinates();
|
||
MOZ_ASSERT(coords.Length() == 2, "wrong number of arguments");
|
||
nscoord rx = 0, ry = 0;
|
||
if (coords[0].GetUnit() == eStyleUnit_Enumerated) {
|
||
EnumerationToLength(rx, coords[0].GetEnumValue<StyleShapeRadius>(),
|
||
center.x, aRefBox.x, aRefBox.x + aRefBox.width);
|
||
} else {
|
||
rx = nsRuleNode::ComputeCoordPercentCalc(coords[0], aRefBox.width);
|
||
}
|
||
if (coords[1].GetUnit() == eStyleUnit_Enumerated) {
|
||
EnumerationToLength(ry, coords[1].GetEnumValue<StyleShapeRadius>(),
|
||
center.y, aRefBox.y, aRefBox.y + aRefBox.height);
|
||
} else {
|
||
ry = nsRuleNode::ComputeCoordPercentCalc(coords[1], aRefBox.height);
|
||
}
|
||
|
||
nscoord appUnitsPerDevPixel =
|
||
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
|
||
EllipseToBezier(builder.get(),
|
||
center / appUnitsPerDevPixel,
|
||
Size(rx, ry) / appUnitsPerDevPixel);
|
||
builder->Close();
|
||
return builder->Finish();
|
||
}
|
||
|
||
already_AddRefed<Path>
|
||
nsCSSClipPathInstance::CreateClipPathPolygon(DrawTarget* aDrawTarget,
|
||
const nsRect& aRefBox)
|
||
{
|
||
StyleBasicShape* basicShape = mClipPathStyle.GetBasicShape();
|
||
const nsTArray<nsStyleCoord>& coords = basicShape->Coordinates();
|
||
MOZ_ASSERT(coords.Length() % 2 == 0 &&
|
||
coords.Length() >= 2, "wrong number of arguments");
|
||
|
||
FillRule fillRule = basicShape->GetFillRule() == StyleFillRule::Nonzero ?
|
||
FillRule::FILL_WINDING : FillRule::FILL_EVEN_ODD;
|
||
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder(fillRule);
|
||
|
||
nscoord x = nsRuleNode::ComputeCoordPercentCalc(coords[0], aRefBox.width);
|
||
nscoord y = nsRuleNode::ComputeCoordPercentCalc(coords[1], aRefBox.height);
|
||
nscoord appUnitsPerDevPixel =
|
||
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
|
||
builder->MoveTo(Point(aRefBox.x + x, aRefBox.y + y) / appUnitsPerDevPixel);
|
||
for (size_t i = 2; i < coords.Length(); i += 2) {
|
||
x = nsRuleNode::ComputeCoordPercentCalc(coords[i], aRefBox.width);
|
||
y = nsRuleNode::ComputeCoordPercentCalc(coords[i + 1], aRefBox.height);
|
||
builder->LineTo(Point(aRefBox.x + x, aRefBox.y + y) / appUnitsPerDevPixel);
|
||
}
|
||
builder->Close();
|
||
return builder->Finish();
|
||
}
|
||
|
||
already_AddRefed<Path>
|
||
nsCSSClipPathInstance::CreateClipPathInset(DrawTarget* aDrawTarget,
|
||
const nsRect& aRefBox)
|
||
{
|
||
StyleBasicShape* basicShape = mClipPathStyle.GetBasicShape();
|
||
const nsTArray<nsStyleCoord>& coords = basicShape->Coordinates();
|
||
MOZ_ASSERT(coords.Length() == 4, "wrong number of arguments");
|
||
|
||
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
|
||
|
||
nscoord appUnitsPerDevPixel =
|
||
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
|
||
|
||
nsMargin inset(nsRuleNode::ComputeCoordPercentCalc(coords[0], aRefBox.height),
|
||
nsRuleNode::ComputeCoordPercentCalc(coords[1], aRefBox.width),
|
||
nsRuleNode::ComputeCoordPercentCalc(coords[2], aRefBox.height),
|
||
nsRuleNode::ComputeCoordPercentCalc(coords[3], aRefBox.width));
|
||
|
||
nsRect insetRect(aRefBox);
|
||
insetRect.Deflate(inset);
|
||
const Rect insetRectPixels = NSRectToRect(insetRect, appUnitsPerDevPixel);
|
||
const nsStyleCorners& radius = basicShape->GetRadius();
|
||
|
||
nscoord appUnitsRadii[8];
|
||
|
||
if (nsIFrame::ComputeBorderRadii(radius, insetRect.Size(), aRefBox.Size(),
|
||
Sides(), appUnitsRadii)) {
|
||
RectCornerRadii corners;
|
||
nsCSSRendering::ComputePixelRadii(appUnitsRadii,
|
||
appUnitsPerDevPixel, &corners);
|
||
|
||
AppendRoundedRectToPath(builder, insetRectPixels, corners, true);
|
||
} else {
|
||
AppendRectToPath(builder, insetRectPixels, true);
|
||
}
|
||
return builder->Finish();
|
||
}
|