Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/ThemePainterMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 55 matching lines @@
     // background. We need WebCore to paint styled backgrounds, so we'll use
     // this AppKit SPI function instead.
     if (!useNSTextFieldCell) {
         _NSDrawCarbonThemeBezel(r, LayoutTheme::isEnabled(o) && !LayoutTheme::isReadOnlyControl(o), YES);
         return false;
     }
 #endif
 
     NSTextFieldCell *textField = m_layoutTheme.textField();
 
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
 
     [textField setEnabled:(LayoutTheme::isEnabled(o) && !LayoutTheme::isReadOnlyControl(o))];
     [textField drawWithFrame:NSRect(r) inView:m_layoutTheme.documentViewFor(o)];
 
     [textField setControlView:nil];
 
     return false;
 }
 
 bool ThemePainterMac::paintCapsLockIndicator(const LayoutObject&, const PaintInfo& paintInfo, const IntRect& r)
@@ skipping 78 matching lines @@
     // Now inflate it to account for the shadow.
     IntRect inflatedRect = r;
     if (r.width() >= m_layoutTheme.minimumMenuListSize(o.styleRef()))
         inflatedRect = ThemeMac::inflateRect(inflatedRect, size, m_layoutTheme.popupButtonMargins(), zoomLevel);
 
     LocalCurrentGraphicsContext localContext(paintInfo.context, &paintInfo.cullRect().m_rect, ThemeMac::inflateRectForFocusRing(inflatedRect));
 
     if (zoomLevel != 1.0f) {
         inflatedRect.setWidth(inflatedRect.width() / zoomLevel);
         inflatedRect.setHeight(inflatedRect.height() / zoomLevel);
-        paintInfo.context->translate(inflatedRect.x(), inflatedRect.y());
-        paintInfo.context->scale(zoomLevel, zoomLevel);
-        paintInfo.context->translate(-inflatedRect.x(), -inflatedRect.y());
+        paintInfo.context.translate(inflatedRect.x(), inflatedRect.y());
+        paintInfo.context.scale(zoomLevel, zoomLevel);
+        paintInfo.context.translate(-inflatedRect.x(), -inflatedRect.y());
     }
 
     NSView *view = m_layoutTheme.documentViewFor(o);
     [popupButton drawWithFrame:inflatedRect inView:view];
     if (!ThemeMac::drawWithFrameDrawsFocusRing() && LayoutTheme::isFocused(o) && o.styleRef().outlineStyleIsAuto())
         [popupButton cr_drawFocusRingWithFrame:inflatedRect inView:view];
     [popupButton setControlView:nil];
 
     return false;
 }
 
 bool ThemePainterMac::paintMeter(const LayoutObject& layoutObject, const PaintInfo& paintInfo, const IntRect& rect)
 {
     if (!layoutObject.isMeter())
         return true;
 
     LocalCurrentGraphicsContext localContext(paintInfo.context, &paintInfo.cullRect().m_rect, rect);
 
     NSLevelIndicatorCell* cell = m_layoutTheme.levelIndicatorFor(toLayoutMeter(layoutObject));
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
 
     [cell drawWithFrame:rect inView:m_layoutTheme.documentViewFor(layoutObject)];
     [cell setControlView:nil];
     return false;
 }
 
 bool ThemePainterMac::paintProgressBar(const LayoutObject& layoutObject, const PaintInfo& paintInfo, const IntRect& rect)
 {
     if (!layoutObject.isProgress())
         return true;
@@ skipping 29 matching lines @@
 
     OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(inflatedRect.size());
     if (!imageBuffer)
         return true;
 
     IntRect clipRect = IntRect(IntPoint(), inflatedRect.size());
     LocalCurrentGraphicsContext localContext(imageBuffer->canvas(), 1, &clipRect, clipRect);
     CGContextRef cgContext = localContext.cgContext();
     HIThemeDrawTrack(&trackInfo, 0, cgContext, kHIThemeOrientationNormal);
 
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
 
     if (!layoutProgress.styleRef().isLeftToRightDirection()) {
-        paintInfo.context->translate(2 * inflatedRect.x() + inflatedRect.width(), 0);
-        paintInfo.context->scale(-1, 1);
+        paintInfo.context.translate(2 * inflatedRect.x() + inflatedRect.width(), 0);
+        paintInfo.context.scale(-1, 1);
     }
 
-    if (!paintInfo.context->contextDisabled())
+    if (!paintInfo.context.contextDisabled())
         imageBuffer->draw(paintInfo.context, FloatRect(inflatedRect.location(), FloatSize(imageBuffer->size())), nullptr, SkXfermode::kSrcOver_Mode);
     return false;
 }
 
 bool ThemePainterMac::paintMenuListButton(const LayoutObject& o, const PaintInfo& paintInfo, const IntRect& r)
 {
     IntRect bounds = IntRect(r.x() + o.styleRef().borderLeftWidth(),
                              r.y() + o.styleRef().borderTopWidth(),
                              r.width() - o.styleRef().borderLeftWidth() - o.styleRef().borderRightWidth(),
                              r.height() - o.styleRef().borderTopWidth() - o.styleRef().borderBottomWidth());
@@ skipping 11 matching lines @@
         return false;
 
     Color color = o.styleRef().visitedDependentColor(CSSPropertyColor);
 
     FloatPoint arrow1[3];
     arrow1[0] = FloatPoint(leftEdge, centerY - spaceBetweenArrows / 2.0f);
     arrow1[1] = FloatPoint(leftEdge + arrowWidth, centerY - spaceBetweenArrows / 2.0f);
     arrow1[2] = FloatPoint(leftEdge + arrowWidth / 2.0f, centerY - spaceBetweenArrows / 2.0f - arrowHeight);
 
     // Draw the top arrow.
-    paintInfo.context->fillPolygon(3, arrow1, color, true);
+    paintInfo.context.fillPolygon(3, arrow1, color, true);
 
     FloatPoint arrow2[3];
     arrow2[0] = FloatPoint(leftEdge, centerY + spaceBetweenArrows / 2.0f);
     arrow2[1] = FloatPoint(leftEdge + arrowWidth, centerY + spaceBetweenArrows / 2.0f);
     arrow2[2] = FloatPoint(leftEdge + arrowWidth / 2.0f, centerY + spaceBetweenArrows / 2.0f + arrowHeight);
 
     // Draw the bottom arrow.
-    paintInfo.context->fillPolygon(3, arrow2, color, true);
+    paintInfo.context.fillPolygon(3, arrow2, color, true);
     return false;
 }
 
 bool ThemePainterMac::paintSliderTrack(const LayoutObject& o, const PaintInfo& paintInfo, const IntRect& r)
 {
     paintSliderTicks(o, paintInfo, r);
 
     float zoomLevel = o.styleRef().effectiveZoom();
     FloatRect unzoomedRect = r;
 
     if (o.styleRef().appearance() ==  SliderHorizontalPart || o.styleRef().appearance() ==  MediaSliderPart) {
         unzoomedRect.setY(ceilf(unzoomedRect.y() + unzoomedRect.height() / 2 - zoomLevel * LayoutThemeMac::sliderTrackWidth / 2));
         unzoomedRect.setHeight(zoomLevel * LayoutThemeMac::sliderTrackWidth);
     } else if (o.styleRef().appearance() == SliderVerticalPart) {
         unzoomedRect.setX(ceilf(unzoomedRect.x() + unzoomedRect.width() / 2 - zoomLevel * LayoutThemeMac::sliderTrackWidth / 2));
         unzoomedRect.setWidth(zoomLevel * LayoutThemeMac::sliderTrackWidth);
     }
 
     if (zoomLevel != 1) {
         unzoomedRect.setWidth(unzoomedRect.width() / zoomLevel);
         unzoomedRect.setHeight(unzoomedRect.height() / zoomLevel);
     }
 
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
     if (zoomLevel != 1) {
-        paintInfo.context->translate(unzoomedRect.x(), unzoomedRect.y());
-        paintInfo.context->scale(zoomLevel, zoomLevel);
-        paintInfo.context->translate(-unzoomedRect.x(), -unzoomedRect.y());
+        paintInfo.context.translate(unzoomedRect.x(), unzoomedRect.y());
+        paintInfo.context.scale(zoomLevel, zoomLevel);
+        paintInfo.context.translate(-unzoomedRect.x(), -unzoomedRect.y());
     }
 
     Color fillColor(205, 205, 205);
     Color borderGradientTopColor(109, 109, 109);
     Color borderGradientBottomColor(181, 181, 181);
     Color shadowColor(0, 0, 0, 118);
 
     if (!LayoutTheme::isEnabled(o)) {
         Color tintColor(255, 255, 255, 128);
         fillColor = fillColor.blend(tintColor);
         borderGradientTopColor = borderGradientTopColor.blend(tintColor);
         borderGradientBottomColor = borderGradientBottomColor.blend(tintColor);
         shadowColor = shadowColor.blend(tintColor);
     }
 
     Color tintColor;
     if (!LayoutTheme::isEnabled(o))
         tintColor = Color(255, 255, 255, 128);
 
     bool isVerticalSlider = o.styleRef().appearance() == SliderVerticalPart;
 
     float fillRadiusSize = (LayoutThemeMac::sliderTrackWidth - LayoutThemeMac::sliderTrackBorderWidth) / 2;
     FloatSize fillRadius(fillRadiusSize, fillRadiusSize);
     FloatRect fillBounds(enclosedIntRect(unzoomedRect));
     FloatRoundedRect fillRect(fillBounds, fillRadius, fillRadius, fillRadius, fillRadius);
-    paintInfo.context->fillRoundedRect(fillRect, fillColor);
+    paintInfo.context.fillRoundedRect(fillRect, fillColor);
 
     FloatSize shadowOffset(isVerticalSlider ? 1 : 0,
                            isVerticalSlider ? 0 : 1);
     float shadowBlur = 3;
     float shadowSpread = 0;
-    paintInfo.context->save();
-    paintInfo.context->drawInnerShadow(fillRect, shadowColor, shadowOffset, shadowBlur, shadowSpread);
-    paintInfo.context->restore();
+    paintInfo.context.save();
+    paintInfo.context.drawInnerShadow(fillRect, shadowColor, shadowOffset, shadowBlur, shadowSpread);
+    paintInfo.context.restore();
 
     RefPtr<Gradient> borderGradient = Gradient::create(fillBounds.minXMinYCorner(),
         isVerticalSlider ? fillBounds.maxXMinYCorner() : fillBounds.minXMaxYCorner());
     borderGradient->addColorStop(0.0, borderGradientTopColor);
     borderGradient->addColorStop(1.0, borderGradientBottomColor);
     Path borderPath;
     FloatRect borderRect(unzoomedRect);
     borderRect.inflate(-LayoutThemeMac::sliderTrackBorderWidth / 2.0);
     float borderRadiusSize = (isVerticalSlider ? borderRect.width() : borderRect.height()) / 2;
     FloatSize borderRadius(borderRadiusSize, borderRadiusSize);
     borderPath.addRoundedRect(borderRect, borderRadius, borderRadius, borderRadius, borderRadius);
-    paintInfo.context->setStrokeGradient(borderGradient);
-    paintInfo.context->setStrokeThickness(LayoutThemeMac::sliderTrackBorderWidth);
-    paintInfo.context->strokePath(borderPath);
+    paintInfo.context.setStrokeGradient(borderGradient);
+    paintInfo.context.setStrokeThickness(LayoutThemeMac::sliderTrackBorderWidth);
+    paintInfo.context.strokePath(borderPath);
     return false;
 }
 
 
 bool ThemePainterMac::paintSliderThumb(const LayoutObject& o, const PaintInfo& paintInfo, const IntRect& r)
 {
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
     float zoomLevel = o.styleRef().effectiveZoom();
 
     FloatRect unzoomedRect(r.x(), r.y(), LayoutThemeMac::sliderThumbWidth, LayoutThemeMac::sliderThumbHeight);
     if (zoomLevel != 1.0f) {
-        paintInfo.context->translate(unzoomedRect.x(), unzoomedRect.y());
-        paintInfo.context->scale(zoomLevel, zoomLevel);
-        paintInfo.context->translate(-unzoomedRect.x(), -unzoomedRect.y());
+        paintInfo.context.translate(unzoomedRect.x(), unzoomedRect.y());
+        paintInfo.context.scale(zoomLevel, zoomLevel);
+        paintInfo.context.translate(-unzoomedRect.x(), -unzoomedRect.y());
     }
 
     Color fillGradientTopColor(250, 250, 250);
     Color fillGradientUpperMiddleColor(244, 244, 244);
     Color fillGradientLowerMiddleColor(236, 236, 236);
     Color fillGradientBottomColor(238, 238, 238);
     Color borderGradientTopColor(151, 151, 151);
     Color borderGradientBottomColor(128, 128, 128);
     Color shadowColor(0, 0, 0, 36);
 
@@ skipping 15 matching lines @@
         borderGradientTopColor = borderGradientTopColor.blend(tintColor);
         borderGradientBottomColor = borderGradientBottomColor.blend(tintColor);
         shadowColor = shadowColor.blend(tintColor);
     }
 
     FloatRect borderBounds = unzoomedRect;
     borderBounds.inflate(LayoutThemeMac::sliderThumbBorderWidth / 2.0);
 
     borderBounds.inflate(-LayoutThemeMac::sliderThumbBorderWidth);
     FloatSize shadowOffset(0, 1);
-    paintInfo.context->setShadow(shadowOffset, LayoutThemeMac::sliderThumbShadowBlur, shadowColor);
-    paintInfo.context->setFillColor(Color::black);
-    paintInfo.context->fillEllipse(borderBounds);
-    paintInfo.context->clearDrawLooper();
+    paintInfo.context.setShadow(shadowOffset, LayoutThemeMac::sliderThumbShadowBlur, shadowColor);
+    paintInfo.context.setFillColor(Color::black);
+    paintInfo.context.fillEllipse(borderBounds);
+    paintInfo.context.clearDrawLooper();
 
     IntRect fillBounds = enclosedIntRect(unzoomedRect);
     RefPtr<Gradient> fillGradient = Gradient::create(fillBounds.minXMinYCorner(), fillBounds.minXMaxYCorner());
     fillGradient->addColorStop(0.0, fillGradientTopColor);
     fillGradient->addColorStop(0.52, fillGradientUpperMiddleColor);
     fillGradient->addColorStop(0.52, fillGradientLowerMiddleColor);
     fillGradient->addColorStop(1.0, fillGradientBottomColor);
-    paintInfo.context->setFillGradient(fillGradient);
-    paintInfo.context->fillEllipse(borderBounds);
+    paintInfo.context.setFillGradient(fillGradient);
+    paintInfo.context.fillEllipse(borderBounds);
 
     RefPtr<Gradient> borderGradient = Gradient::create(fillBounds.minXMinYCorner(), fillBounds.minXMaxYCorner());
     borderGradient->addColorStop(0.0, borderGradientTopColor);
     borderGradient->addColorStop(1.0, borderGradientBottomColor);
-    paintInfo.context->setStrokeGradient(borderGradient);
-    paintInfo.context->setStrokeThickness(LayoutThemeMac::sliderThumbBorderWidth);
-    paintInfo.context->strokeEllipse(borderBounds);
+    paintInfo.context.setStrokeGradient(borderGradient);
+    paintInfo.context.setStrokeThickness(LayoutThemeMac::sliderThumbBorderWidth);
+    paintInfo.context.strokeEllipse(borderBounds);
 
     if (LayoutTheme::isFocused(o)) {
         Path borderPath;
         borderPath.addEllipse(borderBounds);
-        paintInfo.context->drawFocusRing(borderPath, 5, -2, m_layoutTheme.focusRingColor());
+        paintInfo.context.drawFocusRing(borderPath, 5, -2, m_layoutTheme.focusRingColor());
     }
 
     return false;
 }
 
 // We don't use controlSizeForFont() for search field decorations because it
 // needs to fit into the search field. The font size will already be modified by
 // setFontFromControlSize() called on the search field.
 static NSControlSize searchFieldControlSizeForFont(const ComputedStyle& style)
 {
     int fontSize = style.fontSize();
     if (fontSize >= 13)
         return NSRegularControlSize;
     if (fontSize >= 11)
         return NSSmallControlSize;
     return NSMiniControlSize;
 }
 
 bool ThemePainterMac::paintSearchField(const LayoutObject& o, const PaintInfo& paintInfo, const IntRect& r)
 {
     LocalCurrentGraphicsContext localContext(paintInfo.context, &paintInfo.cullRect().m_rect, r);
 
     NSSearchFieldCell* search = m_layoutTheme.search();
     m_layoutTheme.setSearchCellState(o, r);
     [search setControlSize:searchFieldControlSizeForFont(o.styleRef())];
 
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
 
     float zoomLevel = o.styleRef().effectiveZoom();
 
     IntRect unzoomedRect = r;
 
     if (zoomLevel != 1.0f) {
         unzoomedRect.setWidth(unzoomedRect.width() / zoomLevel);
         unzoomedRect.setHeight(unzoomedRect.height() / zoomLevel);
-        paintInfo.context->translate(unzoomedRect.x(), unzoomedRect.y());
-        paintInfo.context->scale(zoomLevel, zoomLevel);
-        paintInfo.context->translate(-unzoomedRect.x(), -unzoomedRect.y());
+        paintInfo.context.translate(unzoomedRect.x(), unzoomedRect.y());
+        paintInfo.context.scale(zoomLevel, zoomLevel);
+        paintInfo.context.translate(-unzoomedRect.x(), -unzoomedRect.y());
     }
 
     // Set the search button to nil before drawing. Then reset it so we can
     // draw it later.
     [search setSearchButtonCell:nil];
 
     [search drawWithFrame:NSRect(unzoomedRect) inView:m_layoutTheme.documentViewFor(o)];
 
     [search setControlView:nil];
     [search resetSearchButtonCell];
 
     return false;
 }
 
 bool ThemePainterMac::paintSearchFieldCancelButton(const LayoutObject& o, const PaintInfo& paintInfo, const IntRect& r)
 {
     if (!o.node())
         return false;
     Element* input = o.node()->shadowHost();
     if (!input)
         input = toElement(o.node());
 
     if (!input->layoutObject()->isBox())
         return false;
 
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
 
     float zoomLevel = o.styleRef().effectiveZoom();
     FloatRect unzoomedRect(r);
     if (zoomLevel != 1.0f) {
         unzoomedRect.setWidth(unzoomedRect.width() / zoomLevel);
         unzoomedRect.setHeight(unzoomedRect.height() / zoomLevel);
-        paintInfo.context->translate(unzoomedRect.x(), unzoomedRect.y());
-        paintInfo.context->scale(zoomLevel, zoomLevel);
-        paintInfo.context->translate(-unzoomedRect.x(), -unzoomedRect.y());
+        paintInfo.context.translate(unzoomedRect.x(), unzoomedRect.y());
+        paintInfo.context.scale(zoomLevel, zoomLevel);
+        paintInfo.context.translate(-unzoomedRect.x(), -unzoomedRect.y());
     }
 
     Color fillColor(200, 200, 200);
 
     if (LayoutTheme::isPressed(o)) {
         Color tintColor(0, 0, 0, 32);
         fillColor = fillColor.blend(tintColor);
     }
 
     float centerX = unzoomedRect.x() + unzoomedRect.width() / 2;
     float centerY = unzoomedRect.y() + unzoomedRect.height() / 2;
     // The line width is 3px on a regular sized, high DPI NSCancelButtonCell
     // (which is 28px wide).
     float lineWidth = unzoomedRect.width() * 3 / 28;
     // The line length is 16px on a regular sized, high DPI NSCancelButtonCell.
     float lineLength = unzoomedRect.width() * 16 / 28;
 
     Path xPath;
     FloatSize lineRectRadius(lineWidth / 2, lineWidth / 2);
     xPath.addRoundedRect(FloatRect(-lineLength / 2, -lineWidth / 2, lineLength, lineWidth),
         lineRectRadius, lineRectRadius, lineRectRadius, lineRectRadius);
     xPath.addRoundedRect(FloatRect(-lineWidth / 2, -lineLength / 2, lineWidth, lineLength),
         lineRectRadius, lineRectRadius, lineRectRadius, lineRectRadius);
 
-    paintInfo.context->translate(centerX, centerY);
-    paintInfo.context->rotate(deg2rad(45.0));
-    paintInfo.context->clipOut(xPath);
-    paintInfo.context->rotate(deg2rad(-45.0));
-    paintInfo.context->translate(-centerX, -centerY);
+    paintInfo.context.translate(centerX, centerY);
+    paintInfo.context.rotate(deg2rad(45.0));
+    paintInfo.context.clipOut(xPath);
+    paintInfo.context.rotate(deg2rad(-45.0));
+    paintInfo.context.translate(-centerX, -centerY);
 
-    paintInfo.context->setFillColor(fillColor);
-    paintInfo.context->fillEllipse(unzoomedRect);
+    paintInfo.context.setFillColor(fillColor);
+    paintInfo.context.fillEllipse(unzoomedRect);
 
     return false;
 }
 
 bool ThemePainterMac::paintSearchFieldDecoration(const LayoutObject&, const PaintInfo&, const IntRect&)
 {
     return false;
 }
 
 bool ThemePainterMac::paintSearchFieldResultsDecoration(const LayoutObject& o, const PaintInfo& paintInfo, const IntRect& r)
 {
     if (!o.node())
         return false;
     Node* input = o.node()->shadowHost();
     if (!input)
         input = o.node();
     if (!input->layoutObject()->isBox())
         return false;
 
-    GraphicsContextStateSaver stateSaver(*paintInfo.context);
+    GraphicsContextStateSaver stateSaver(paintInfo.context);
 
     float zoomLevel = o.styleRef().effectiveZoom();
     FloatRect unzoomedRect(r);
     if (zoomLevel != 1) {
         unzoomedRect.setWidth(unzoomedRect.width() / zoomLevel);
         unzoomedRect.setHeight(unzoomedRect.height() / zoomLevel);
-        paintInfo.context->translate(unzoomedRect.x(), unzoomedRect.y());
-        paintInfo.context->scale(zoomLevel, zoomLevel);
-        paintInfo.context->translate(-unzoomedRect.x(), -unzoomedRect.y());
+        paintInfo.context.translate(unzoomedRect.x(), unzoomedRect.y());
+        paintInfo.context.scale(zoomLevel, zoomLevel);
+        paintInfo.context.translate(-unzoomedRect.x(), -unzoomedRect.y());
     }
 
     LocalCurrentGraphicsContext localContext(paintInfo.context, &paintInfo.cullRect().m_rect, r);
 
     NSSearchFieldCell* search = m_layoutTheme.search();
     m_layoutTheme.setSearchCellState(*input->layoutObject(), r);
     [search setControlSize:searchFieldControlSizeForFont(o.styleRef())];
     if ([search searchMenuTemplate] != nil)
         [search setSearchMenuTemplate:nil];
 
     m_layoutTheme.updateActiveState([search searchButtonCell], o);
 
     [[search searchButtonCell] drawWithFrame:unzoomedRect inView:m_layoutTheme.documentViewFor(o)];
     [[search searchButtonCell] setControlView:nil];
     return false;
 }
 
 } // namespace blink