Revert of Use Shadow DOM to display fallback content for images

Source/core/paint/ImagePainter.cpp

Index: Source/core/paint/ImagePainter.cpp
diff --git a/Source/core/paint/ImagePainter.cpp b/Source/core/paint/ImagePainter.cpp
index 922242274108ed2d6aeab8d70131be7b752dcf52..5675fc01ac074029c5e1d2fda1757cabf725b030 100644
--- a/Source/core/paint/ImagePainter.cpp
+++ b/Source/core/paint/ImagePainter.cpp
@@ -78,20 +78,82 @@
 
     GraphicsContext* context = paintInfo.context;
 
-    if (!m_renderImage.imageResource()->hasImage()) {
+    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.
-            IntRect paintRect = pixelSnappedIntRect(LayoutRect(paintOffset.x() + m_renderImage.borderLeft() + m_renderImage.paddingLeft(), paintOffset.y() + m_renderImage.borderTop() + m_renderImage.paddingTop(), cWidth, cHeight));
+            IntRect paintRect = pixelSnappedIntRect(LayoutRect(paintOffset.x() + leftBorder + leftPad, paintOffset.y() + topBorder + topPad, cWidth, cHeight));
             DrawingRecorder recorder(context, &m_renderImage, paintInfo.phase, paintRect);
             context->setStrokeStyle(SolidStroke);
             context->setStrokeColor(Color::lightGray);
             context->setFillColor(Color::transparent);
             context->drawRect(paintRect);
+
+            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 (cWidth > 0 && cHeight > 0) {
+    } else if (m_renderImage.imageResource()->hasImage() && cWidth > 0 && cHeight > 0) {
         LayoutRect contentRect = m_renderImage.contentBoxRect();
         contentRect.moveBy(paintOffset);
         LayoutRect paintRect = m_renderImage.replacedContentRect();