Move paint code from RenderImage/RenderVideo into ImagePainter/VideoPainter.

Source/core/paint/ImagePainter.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/paint/ImagePainter.h"
+
+#include "core/dom/Document.h"
+#include "core/dom/Element.h"
+#include "core/editing/FrameSelection.h"
+#include "core/frame/LocalFrame.h"
+#include "core/html/HTMLAreaElement.h"
+#include "core/html/HTMLImageElement.h"
+#include "core/inspector/InspectorInstrumentation.h"
+#include "core/page/Page.h"
+#include "core/paint/BoxPainter.h"
+#include "core/rendering/PaintInfo.h"
+#include "core/rendering/RenderImage.h"
+#include "core/rendering/RenderReplaced.h"
+#include "core/rendering/TextRunConstructor.h"
+#include "platform/geometry/LayoutPoint.h"
+#include "platform/graphics/GraphicsContextStateSaver.h"
+#include "platform/graphics/Path.h"
+
+namespace blink {
+
+void ImagePainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    m_renderImage.RenderReplaced::paint(paintInfo, paintOffset);
+
+    if (paintInfo.phase == PaintPhaseOutline)
+        paintAreaElementFocusRing(paintInfo);
+}
+
+void ImagePainter::paintAreaElementFocusRing(PaintInfo& paintInfo)
+{
+    Document& document = m_renderImage.document();
+
+    if (document.printing() || !document.frame()->selection().isFocusedAndActive())
+        return;
+
+    Element* focusedElement = document.focusedElement();
+    if (!isHTMLAreaElement(focusedElement))
+        return;
+
+    HTMLAreaElement& areaElement = toHTMLAreaElement(*focusedElement);
+    if (areaElement.imageElement() != m_renderImage.node())
+        return;
+
+    // Even if the theme handles focus ring drawing for entire elements, it won't do it for
+    // an area within an image, so we don't call RenderTheme::supportsFocusRing here.
+
+    Path path = areaElement.computePath(&m_renderImage);
+    if (path.isEmpty())
+        return;
+
+    RenderStyle* areaElementStyle = areaElement.computedStyle();
+    unsigned short outlineWidth = areaElementStyle->outlineWidth();
+    if (!outlineWidth)
+        return;
+
+    // FIXME: Clip path instead of context when Skia pathops is ready.
+    // https://crbug.com/251206
+    GraphicsContextStateSaver savedContext(*paintInfo.context);
+    paintInfo.context->clip(m_renderImage.absoluteContentBox());
+    paintInfo.context->drawFocusRing(path, outlineWidth,
+        areaElementStyle->outlineOffset(),
+        m_renderImage.resolveColor(areaElementStyle, CSSPropertyOutlineColor));
+}
+
+void ImagePainter::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
+{
+    LayoutUnit cWidth = m_renderImage.contentWidth();
+    LayoutUnit cHeight = m_renderImage.contentHeight();
+
+    GraphicsContext* context = paintInfo.context;
+
+    if (!m_renderImage.imageResource()->hasImage() || m_renderImage.imageResource()->errorOccurred()) {
+        if (paintInfo.phase == PaintPhaseSelection)
+            return;
+
+        if (cWidth > 2 && cHeight > 2) {
+            const int borderWidth = 1;
+
+            LayoutUnit leftBorder = m_renderImage.borderLeft();
+            LayoutUnit topBorder = m_renderImage.borderTop();
+            LayoutUnit leftPad = m_renderImage.paddingLeft();
+            LayoutUnit topPad = m_renderImage.paddingTop();
+
+            // Draw an outline rect where the image should be.
+            context->setStrokeStyle(SolidStroke);
+            context->setStrokeColor(Color::lightGray);
+            context->setFillColor(Color::transparent);
+            context->drawRect(pixelSnappedIntRect(LayoutRect(paintOffset.x() + leftBorder + leftPad, paintOffset.y() + topBorder + topPad, cWidth, cHeight)));
+
+            bool errorPictureDrawn = false;
+            LayoutSize imageOffset;
+            // When calculating the usable dimensions, exclude the pixels of
+            // the ouline rect so the error image/alt text doesn't draw on it.
+            LayoutUnit usableWidth = cWidth - 2 * borderWidth;
+            LayoutUnit usableHeight = cHeight - 2 * borderWidth;
+
+            RefPtr<Image> image = m_renderImage.imageResource()->image();
+
+            if (m_renderImage.imageResource()->errorOccurred() && !image->isNull() && usableWidth >= image->width() && usableHeight >= image->height()) {
+                float deviceScaleFactor = blink::deviceScaleFactor(m_renderImage.frame());
+                // Call brokenImage() explicitly to ensure we get the broken image icon at the appropriate resolution.
+                pair<Image*, float> brokenImageAndImageScaleFactor = ImageResource::brokenImage(deviceScaleFactor);
+                image = brokenImageAndImageScaleFactor.first;
+                IntSize imageSize = image->size();
+                imageSize.scale(1 / brokenImageAndImageScaleFactor.second);
+                // Center the error image, accounting for border and padding.
+                LayoutUnit centerX = (usableWidth - imageSize.width()) / 2;
+                if (centerX < 0)
+                    centerX = 0;
+                LayoutUnit centerY = (usableHeight - imageSize.height()) / 2;
+                if (centerY < 0)
+                    centerY = 0;
+                imageOffset = LayoutSize(leftBorder + leftPad + centerX + borderWidth, topBorder + topPad + centerY + borderWidth);
+                context->drawImage(image.get(), pixelSnappedIntRect(LayoutRect(paintOffset + imageOffset, imageSize)), CompositeSourceOver, m_renderImage.shouldRespectImageOrientation());
+                errorPictureDrawn = true;
+            }
+
+            if (!m_renderImage.altText().isEmpty()) {
+                const Font& font = m_renderImage.style()->font();
+                const FontMetrics& fontMetrics = font.fontMetrics();
+                LayoutUnit ascent = fontMetrics.ascent();
+                LayoutPoint textRectOrigin = paintOffset;
+                textRectOrigin.move(leftBorder + leftPad + (RenderImage::paddingWidth / 2) - borderWidth, topBorder + topPad + (RenderImage::paddingHeight / 2) - borderWidth);
+                LayoutPoint textOrigin(textRectOrigin.x(), textRectOrigin.y() + ascent);
+
+                // Only draw the alt text if it'll fit within the content box,
+                // and only if it fits above the error image.
+                TextRun textRun = constructTextRun(&m_renderImage, font, m_renderImage.altText(), m_renderImage.style(), TextRun::AllowTrailingExpansion | TextRun::ForbidLeadingExpansion, DefaultTextRunFlags | RespectDirection);
+                float textWidth = font.width(textRun);
+                TextRunPaintInfo textRunPaintInfo(textRun);
+                textRunPaintInfo.bounds = FloatRect(textRectOrigin, FloatSize(textWidth, fontMetrics.height()));
+                context->setFillColor(m_renderImage.resolveColor(CSSPropertyColor));
+                if (textRun.direction() == RTL) {
+                    int availableWidth = cWidth - static_cast<int>(RenderImage::paddingWidth);
+                    textOrigin.move(availableWidth - ceilf(textWidth), 0);
+                }
+                if (errorPictureDrawn) {
+                    if (usableWidth >= textWidth && fontMetrics.height() <= imageOffset.height())
+                        context->drawBidiText(font, textRunPaintInfo, textOrigin);
+                } else if (usableWidth >= textWidth && usableHeight >= fontMetrics.height()) {
+                    context->drawBidiText(font, textRunPaintInfo, textOrigin);
+                }
+            }
+        }
+    } else if (m_renderImage.imageResource()->hasImage() && cWidth > 0 && cHeight > 0) {
+        LayoutRect contentRect = m_renderImage.contentBoxRect();
+        contentRect.moveBy(paintOffset);
+        LayoutRect paintRect = m_renderImage.replacedContentRect();
+        paintRect.moveBy(paintOffset);
+        bool clip = !contentRect.contains(paintRect);
+        if (clip) {
+            context->save();
+            context->clip(contentRect);
+        }
+
+        paintIntoRect(context, paintRect);
+
+        if (clip)
+            context->restore();
+    }
+}
+
+void ImagePainter::paintIntoRect(GraphicsContext* context, const LayoutRect& rect)
+{
+    IntRect alignedRect = pixelSnappedIntRect(rect);
+    if (!m_renderImage.imageResource()->hasImage() || m_renderImage.imageResource()->errorOccurred() || alignedRect.width() <= 0 || alignedRect.height() <= 0)
+        return;
+
+    RefPtr<Image> img = m_renderImage.imageResource()->image(alignedRect.width(), alignedRect.height());
+    if (!img || img->isNull())
+        return;
+
+    HTMLImageElement* imageElt = isHTMLImageElement(m_renderImage.node()) ? toHTMLImageElement(m_renderImage.node()) : 0;
+    CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
+    Image* image = img.get();
+    InterpolationQuality interpolationQuality = BoxPainter::chooseInterpolationQuality(m_renderImage, context, image, image, alignedRect.size());
+
+    TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data", InspectorPaintImageEvent::data(m_renderImage));
+    // FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
+    InspectorInstrumentation::willPaintImage(&m_renderImage);
+    InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
+    context->setImageInterpolationQuality(interpolationQuality);
+    context->drawImage(image, alignedRect, compositeOperator, m_renderImage.shouldRespectImageOrientation());
+    context->setImageInterpolationQuality(previousInterpolationQuality);
+    InspectorInstrumentation::didPaintImage(&m_renderImage);
+}
+
+} // namespace blink