void BitmapImageSingleFrameSkia::draw(GraphicsContext* ctxt,
const FloatRect& dstRect,
const FloatRect& srcRect,
ColorSpace styleColorSpace,
CompositeOperator compositeOp)
{
FloatRect normDstRect = normalizeRect(dstRect);
FloatRect normSrcRect = normalizeRect(srcRect);
if (normSrcRect.isEmpty() || normDstRect.isEmpty())
return; // Nothing to draw.
if (ctxt->platformContext()->useGPU() && ctxt->platformContext()->canAccelerate()) {
drawBitmapGLES2(ctxt, &m_nativeImage, srcRect, dstRect, styleColorSpace, compositeOp);
return;
}
ctxt->platformContext()->prepareForSoftwareDraw();
paintSkBitmap(ctxt->platformContext(),
m_nativeImage,
enclosingIntRect(normSrcRect),
normDstRect,
WebCoreCompositeToSkiaComposite(compositeOp));
}
void GraphicsContext::setPlatformCompositeOperation(CompositeOperator op)
{
if (paintingDisabled())
return;
platformContext()->setXfermodeMode(WebCoreCompositeToSkiaComposite(op));
}
void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect,
const FloatRect& srcRect, ColorSpace colorSpace, CompositeOperator compositeOp)
{
if (!m_source.initialized())
return;
// Spin the animation to the correct frame before we try to draw it, so we
// don't draw an old frame and then immediately need to draw a newer one,
// causing flicker and wasting CPU.
startAnimation();
NativeImageSkia* bm = nativeImageForCurrentFrame();
if (!bm)
return; // It's too early and we don't have an image yet.
FloatRect normDstRect = normalizeRect(dstRect);
FloatRect normSrcRect = normalizeRect(srcRect);
if (normSrcRect.isEmpty() || normDstRect.isEmpty())
return; // Nothing to draw.
if (ctxt->platformContext()->useGPU() && ctxt->platformContext()->canAccelerate()) {
drawBitmapGLES2(ctxt, bm, normSrcRect, normDstRect, colorSpace, compositeOp);
return;
}
ctxt->platformContext()->prepareForSoftwareDraw();
paintSkBitmap(ctxt->platformContext(),
*bm,
enclosingIntRect(normSrcRect),
normDstRect,
WebCoreCompositeToSkiaComposite(compositeOp));
}
void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect,
const FloatRect& srcRect, ColorSpace colorSpace, CompositeOperator compositeOp)
{
if (!m_source.initialized())
return;
// Spin the animation to the correct frame before we try to draw it, so we
// don't draw an old frame and then immediately need to draw a newer one,
// causing flicker and wasting CPU.
startAnimation();
NativeImageSkia* bm = nativeImageForCurrentFrame();
if (!bm)
return; // It's too early and we don't have an image yet.
FloatRect normDstRect = normalizeRect(dstRect);
FloatRect normSrcRect = normalizeRect(srcRect);
if (normSrcRect.isEmpty() || normDstRect.isEmpty())
return; // Nothing to draw.
paintSkBitmap(ctxt->platformContext(),
*bm,
normSrcRect,
normDstRect,
WebCoreCompositeToSkiaComposite(compositeOp));
if (ImageObserver* observer = imageObserver())
observer->didDraw(this);
}
void GraphicsContextState::setCompositeOperation(CompositeOperator compositeOperation, WebBlendMode blendMode)
{
m_compositeOperator = compositeOperation;
m_blendMode = blendMode;
SkXfermode::Mode xferMode = WebCoreCompositeToSkiaComposite(compositeOperation, blendMode);
m_strokePaint.setXfermodeMode(xferMode);
m_fillPaint.setXfermodeMode(xferMode);
}
PassRefPtr<SkImageFilter> FEBlend::createImageFilter(SkiaImageFilterBuilder* builder)
{
RefPtr<SkImageFilter> foreground(builder->build(inputEffect(0), operatingColorSpace()));
RefPtr<SkImageFilter> background(builder->build(inputEffect(1), operatingColorSpace()));
RefPtr<SkXfermode> mode(adoptRef(SkXfermode::Create(WebCoreCompositeToSkiaComposite(CompositeSourceOver, m_mode))));
SkImageFilter::CropRect cropRect = getCropRect(builder->cropOffset());
return adoptRef(SkXfermodeImageFilter::Create(mode.get(), background.get(), foreground.get(), &cropRect));
}
PassRefPtr<SkImageFilter> FEBlend::createImageFilter(SkiaImageFilterBuilder& builder)
{
RefPtr<SkImageFilter> foreground(builder.build(inputEffect(0), operatingColorSpace()));
RefPtr<SkImageFilter> background(builder.build(inputEffect(1), operatingColorSpace()));
sk_sp<SkXfermode> mode(SkXfermode::Make(WebCoreCompositeToSkiaComposite(CompositeSourceOver, m_mode)));
SkImageFilter::CropRect cropRect = getCropRect();
return fromSkSp(SkXfermodeImageFilter::Make(std::move(mode), background.get(), foreground.get(), &cropRect));
}
void GraphicsContext::setCompositeOperation(CompositeOperator op)
{
if (paintingDisabled())
return;
if (platformContext()->useGPU())
platformContext()->gpuCanvas()->setCompositeOperation(op);
platformContext()->setXfermodeMode(WebCoreCompositeToSkiaComposite(op));
}
void PlatformGraphicsContextSkia::drawBitmapRect(const SkBitmap& bitmap,
const SkIRect* src, const SkRect& dst,
CompositeOperator op)
{
SkPaint paint;
setupPaintCommon(&paint);
paint.setAlpha(getNormalizedAlpha());
paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(op));
fixPaintForBitmapsThatMaySeam(&paint);
mCanvas->drawBitmapRect(bitmap, src, dst, &paint);
}
void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace colorSpace, CompositeOperator compositeOp, RespectImageOrientationEnum shouldRespectImageOrientation)
{
if (!m_source.initialized())
return;
// Spin the animation to the correct frame before we try to draw it, so we
// don't draw an old frame and then immediately need to draw a newer one,
// causing flicker and wasting CPU.
startAnimation();
NativeImageSkia* bm = nativeImageForCurrentFrame();
if (!bm)
return; // It's too early and we don't have an image yet.
FloatRect normDstRect = normalizeRect(dstRect);
FloatRect normSrcRect = normalizeRect(srcRect);
normSrcRect.intersect(FloatRect(0, 0, bm->bitmap().width(), bm->bitmap().height()));
if (normSrcRect.isEmpty() || normDstRect.isEmpty())
return; // Nothing to draw.
ImageOrientation orientation = DefaultImageOrientation;
if (shouldRespectImageOrientation == RespectImageOrientation)
orientation = frameOrientationAtIndex(m_currentFrame);
GraphicsContextStateSaver saveContext(*ctxt, false);
if (orientation != DefaultImageOrientation) {
saveContext.save();
// ImageOrientation expects the origin to be at (0, 0)
ctxt->translate(normDstRect.x(), normDstRect.y());
normDstRect.setLocation(FloatPoint());
ctxt->concatCTM(orientation.transformFromDefault(normDstRect.size()));
if (orientation.usesWidthAsHeight()) {
// The destination rect will have it's width and height already reversed for the orientation of
// the image, as it was needed for page layout, so we need to reverse it back here.
normDstRect = FloatRect(normDstRect.x(), normDstRect.y(), normDstRect.height(), normDstRect.width());
}
}
paintSkBitmap(ctxt->platformContext(),
*bm,
normSrcRect,
normDstRect,
WebCoreCompositeToSkiaComposite(compositeOp));
if (ImageObserver* observer = imageObserver())
observer->didDraw(this);
}
void PlatformGraphicsContextSkia::drawBitmapPattern(
const SkBitmap& bitmap, const SkMatrix& matrix,
CompositeOperator compositeOp, const FloatRect& destRect)
{
SkShader* shader = SkShader::CreateBitmapShader(bitmap,
SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode);
shader->setLocalMatrix(matrix);
SkPaint paint;
setupPaintCommon(&paint);
paint.setAlpha(getNormalizedAlpha());
paint.setShader(shader)->unref();
paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp));
fixPaintForBitmapsThatMaySeam(&paint);
mCanvas->drawRect(destRect, paint);
}
void SVGPaintContext::applyCompositingIfNecessary() {
DCHECK(!paintInfo().isRenderingClipPathAsMaskImage());
const ComputedStyle& style = m_object.styleRef();
float opacity = style.opacity();
WebBlendMode blendMode = style.hasBlendMode() && m_object.isBlendingAllowed()
? style.blendMode()
: WebBlendModeNormal;
if (opacity < 1 || blendMode != WebBlendModeNormal) {
const FloatRect compositingBounds =
m_object.visualRectInLocalSVGCoordinates();
m_compositingRecorder = WTF::wrapUnique(new CompositingRecorder(
paintInfo().context, m_object,
WebCoreCompositeToSkiaComposite(CompositeSourceOver, blendMode),
opacity, &compositingBounds));
}
}
void BitmapImageSingleFrameSkia::draw(GraphicsContext* ctxt,
const FloatRect& dstRect,
const FloatRect& srcRect,
ColorSpace styleColorSpace,
CompositeOperator compositeOp)
{
FloatRect normDstRect = normalizeRect(dstRect);
FloatRect normSrcRect = normalizeRect(srcRect);
if (normSrcRect.isEmpty() || normDstRect.isEmpty())
return; // Nothing to draw.
paintSkBitmap(ctxt->platformContext(),
m_nativeImage,
enclosingIntRect(normSrcRect),
normDstRect,
WebCoreCompositeToSkiaComposite(compositeOp));
}
void SVGPaintContext::applyCompositingIfNecessary()
{
ASSERT(!m_paintInfo.isRenderingClipPathAsMaskImage());
// Layer takes care of root opacity and blend mode.
if (m_object->isSVGRoot())
return;
const ComputedStyle& style = m_object->styleRef();
float opacity = style.opacity();
WebBlendMode blendMode = style.hasBlendMode() && m_object->isBlendingAllowed() ?
style.blendMode() : WebBlendModeNormal;
if (opacity < 1 || blendMode != WebBlendModeNormal) {
const FloatRect compositingBounds = m_object->paintInvalidationRectInLocalCoordinates();
m_compositingRecorder = adoptPtr(new CompositingRecorder(*m_paintInfo.context, *m_object,
WebCoreCompositeToSkiaComposite(CompositeSourceOver, blendMode), opacity, &compositingBounds));
}
}
void BitmapImageSingleFrameSkia::draw(GraphicsContext* ctxt,
const FloatRect& dstRect,
const FloatRect& srcRect,
ColorSpace styleColorSpace,
CompositeOperator compositeOp)
{
FloatRect normDstRect = normalizeRect(dstRect);
FloatRect normSrcRect = normalizeRect(srcRect);
normSrcRect.intersect(FloatRect(0, 0, m_nativeImage.bitmap().width(), m_nativeImage.bitmap().height()));
if (normSrcRect.isEmpty() || normDstRect.isEmpty())
return; // Nothing to draw.
paintSkBitmap(ctxt->platformContext(),
m_nativeImage,
normSrcRect,
normDstRect,
WebCoreCompositeToSkiaComposite(compositeOp));
if (ImageObserver* observer = imageObserver())
observer->didDraw(this);
}
PaintLayerPainter::PaintResult PaintLayerPainter::paintLayerContentsInternal(GraphicsContext* context, const PaintLayerPaintingInfo& paintingInfoArg, PaintLayerFlags paintFlags, FragmentPolicy fragmentPolicy)
{
ASSERT(m_paintLayer.isSelfPaintingLayer() || m_paintLayer.hasSelfPaintingLayerDescendant());
ASSERT(!(paintFlags & PaintLayerAppliedTransform));
bool isSelfPaintingLayer = m_paintLayer.isSelfPaintingLayer();
bool isPaintingOverlayScrollbars = paintFlags & PaintLayerPaintingOverlayScrollbars;
bool isPaintingScrollingContent = paintFlags & PaintLayerPaintingCompositingScrollingPhase;
bool isPaintingCompositedForeground = paintFlags & PaintLayerPaintingCompositingForegroundPhase;
bool isPaintingCompositedBackground = paintFlags & PaintLayerPaintingCompositingBackgroundPhase;
bool isPaintingOverflowContents = paintFlags & PaintLayerPaintingOverflowContents;
// Outline always needs to be painted even if we have no visible content. Also,
// the outline is painted in the background phase during composited scrolling.
// If it were painted in the foreground phase, it would move with the scrolled
// content. When not composited scrolling, the outline is painted in the
// foreground phase. Since scrolled contents are moved by paint invalidation in this
// case, the outline won't get 'dragged along'.
bool shouldPaintOutline = isSelfPaintingLayer && !isPaintingOverlayScrollbars
&& ((isPaintingScrollingContent && isPaintingCompositedBackground)
|| (!isPaintingScrollingContent && isPaintingCompositedForeground));
bool shouldPaintContent = m_paintLayer.hasVisibleContent() && isSelfPaintingLayer && !isPaintingOverlayScrollbars;
PaintResult result = FullyPainted;
if (paintFlags & PaintLayerPaintingRootBackgroundOnly && !m_paintLayer.layoutObject()->isLayoutView() && !m_paintLayer.layoutObject()->isDocumentElement())
return result;
PaintLayerPaintingInfo paintingInfo = paintingInfoArg;
// Ensure our lists are up-to-date.
m_paintLayer.stackingNode()->updateLayerListsIfNeeded();
LayoutPoint offsetFromRoot;
m_paintLayer.convertToLayerCoords(paintingInfo.rootLayer, offsetFromRoot);
if (m_paintLayer.compositingState() == PaintsIntoOwnBacking)
offsetFromRoot.move(m_paintLayer.subpixelAccumulation());
else
offsetFromRoot.move(paintingInfo.subPixelAccumulation);
LayoutRect bounds = m_paintLayer.physicalBoundingBox(offsetFromRoot);
if (!paintingInfo.paintDirtyRect.contains(bounds))
result = MaybeNotFullyPainted;
LayoutRect rootRelativeBounds;
bool rootRelativeBoundsComputed = false;
if (paintingInfo.ancestorHasClipPathClipping && m_paintLayer.layoutObject()->style()->position() != StaticPosition)
UseCounter::count(m_paintLayer.layoutObject()->document(), UseCounter::ClipPathOfPositionedElement);
// These helpers output clip and compositing operations using a RAII pattern. Stack-allocated-varibles are destructed in the reverse order of construction,
// so they are nested properly.
ClipPathHelper clipPathHelper(context, m_paintLayer, paintingInfo, rootRelativeBounds, rootRelativeBoundsComputed, offsetFromRoot, paintFlags);
Optional<CompositingRecorder> compositingRecorder;
// Blending operations must be performed only with the nearest ancestor stacking context.
// Note that there is no need to composite if we're painting the root.
// FIXME: this should be unified further into PaintLayer::paintsWithTransparency().
bool shouldCompositeForBlendMode = (!m_paintLayer.layoutObject()->isDocumentElement() || m_paintLayer.layoutObject()->isSVGRoot()) && m_paintLayer.stackingNode()->isStackingContext() && m_paintLayer.hasNonIsolatedDescendantWithBlendMode();
if (shouldCompositeForBlendMode || m_paintLayer.paintsWithTransparency(paintingInfo.globalPaintFlags())) {
FloatRect compositingBounds = FloatRect(m_paintLayer.paintingExtent(paintingInfo.rootLayer, paintingInfo.subPixelAccumulation, paintingInfo.globalPaintFlags()));
compositingRecorder.emplace(*context, *m_paintLayer.layoutObject(),
WebCoreCompositeToSkiaComposite(CompositeSourceOver, m_paintLayer.layoutObject()->style()->blendMode()),
m_paintLayer.layoutObject()->opacity(), &compositingBounds);
}
PaintLayerPaintingInfo localPaintingInfo(paintingInfo);
if (m_paintLayer.compositingState() == PaintsIntoOwnBacking)
localPaintingInfo.subPixelAccumulation = m_paintLayer.subpixelAccumulation();
PaintLayerFragments layerFragments;
if (shouldPaintContent || shouldPaintOutline || isPaintingOverlayScrollbars) {
// Collect the fragments. This will compute the clip rectangles and paint offsets for each layer fragment.
ClipRectsCacheSlot cacheSlot = (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects : PaintingClipRects;
ShouldRespectOverflowClip respectOverflowClip = shouldRespectOverflowClip(paintFlags, m_paintLayer.layoutObject());
if (fragmentPolicy == ForceSingleFragment)
m_paintLayer.appendSingleFragmentIgnoringPagination(layerFragments, localPaintingInfo.rootLayer, localPaintingInfo.paintDirtyRect, cacheSlot, IgnoreOverlayScrollbarSize, respectOverflowClip, &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
else
m_paintLayer.collectFragments(layerFragments, localPaintingInfo.rootLayer, localPaintingInfo.paintDirtyRect, cacheSlot, IgnoreOverlayScrollbarSize, respectOverflowClip, &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
if (shouldPaintContent) {
// TODO(wangxianzhu): This is for old slow scrolling. Implement similar optimization for slimming paint v2.
shouldPaintContent = atLeastOneFragmentIntersectsDamageRect(layerFragments, localPaintingInfo, paintFlags, offsetFromRoot);
if (!shouldPaintContent)
result = MaybeNotFullyPainted;
}
}
bool selectionOnly = localPaintingInfo.globalPaintFlags() & GlobalPaintSelectionOnly;
// If this layer's layoutObject is a child of the paintingRoot, we paint unconditionally, which
// is done by passing a nil paintingRoot down to our layoutObject (as if no paintingRoot was ever set).
// Else, our layout tree may or may not contain the painting root, so we pass that root along
// so it will be tested against as we descend through the layoutObjects.
LayoutObject* paintingRootForLayoutObject = 0;
if (localPaintingInfo.paintingRoot && !m_paintLayer.layoutObject()->isDescendantOf(localPaintingInfo.paintingRoot))
paintingRootForLayoutObject = localPaintingInfo.paintingRoot;
{ // Begin block for the lifetime of any filter.
FilterPainter filterPainter(m_paintLayer, context, offsetFromRoot, layerFragments.isEmpty() ? ClipRect() : layerFragments[0].backgroundRect, localPaintingInfo, paintFlags,
rootRelativeBounds, rootRelativeBoundsComputed);
bool shouldPaintBackground = isPaintingCompositedBackground && shouldPaintContent && !selectionOnly;
bool shouldPaintNegZOrderList = (isPaintingScrollingContent && isPaintingOverflowContents) || (!isPaintingScrollingContent && isPaintingCompositedBackground);
bool shouldPaintOwnContents = isPaintingCompositedForeground && shouldPaintContent;
bool shouldPaintNormalFlowAndPosZOrderLists = isPaintingCompositedForeground;
bool shouldPaintOverlayScrollbars = isPaintingOverlayScrollbars;
if (shouldPaintBackground) {
paintBackgroundForFragments(layerFragments, context, paintingInfo.paintDirtyRect,
localPaintingInfo, paintingRootForLayoutObject, paintFlags);
}
if (shouldPaintNegZOrderList) {
if (paintChildren(NegativeZOrderChildren, context, paintingInfo, paintFlags) == MaybeNotFullyPainted)
result = MaybeNotFullyPainted;
}
if (shouldPaintOwnContents) {
paintForegroundForFragments(layerFragments, context, paintingInfo.paintDirtyRect,
localPaintingInfo, paintingRootForLayoutObject, selectionOnly, paintFlags);
}
if (shouldPaintOutline)
paintOutlineForFragments(layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags);
if (shouldPaintNormalFlowAndPosZOrderLists) {
if (paintChildren(NormalFlowChildren | PositiveZOrderChildren, context, paintingInfo, paintFlags) == MaybeNotFullyPainted)
result = MaybeNotFullyPainted;
}
if (shouldPaintOverlayScrollbars)
paintOverflowControlsForFragments(layerFragments, context, localPaintingInfo, paintFlags);
} // FilterPainter block
bool shouldPaintMask = (paintFlags & PaintLayerPaintingCompositingMaskPhase) && shouldPaintContent && m_paintLayer.layoutObject()->hasMask() && !selectionOnly;
bool shouldPaintClippingMask = (paintFlags & PaintLayerPaintingChildClippingMaskPhase) && shouldPaintContent && !selectionOnly;
if (shouldPaintMask)
paintMaskForFragments(layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags);
if (shouldPaintClippingMask) {
// Paint the border radius mask for the fragments.
paintChildClippingMaskForFragments(layerFragments, context, localPaintingInfo, paintingRootForLayoutObject, paintFlags);
}
m_paintLayer.setPreviousScrollOffsetAccumulationForPainting(paintingInfoArg.scrollOffsetAccumulation);
return result;
}
void Image::drawPattern(GraphicsContext* context,
const FloatRect& floatSrcRect,
const AffineTransform& patternTransform,
const FloatPoint& phase,
ColorSpace styleColorSpace,
CompositeOperator compositeOp,
const FloatRect& destRect)
{
#if PLATFORM(CHROMIUM)
TRACE_EVENT0("skia", "Image::drawPattern");
#endif
FloatRect normSrcRect = normalizeRect(floatSrcRect);
if (destRect.isEmpty() || normSrcRect.isEmpty())
return; // nothing to draw
NativeImageSkia* bitmap = nativeImageForCurrentFrame();
if (!bitmap)
return;
SkMatrix ctm = context->platformContext()->canvas()->getTotalMatrix();
SkMatrix totalMatrix;
totalMatrix.setConcat(ctm, patternTransform);
// Figure out what size the bitmap will be in the destination. The
// destination rect is the bounds of the pattern, we need to use the
// matrix to see how big it will be.
SkRect destRectTarget;
totalMatrix.mapRect(&destRectTarget, normSrcRect);
float destBitmapWidth = SkScalarToFloat(destRectTarget.width());
float destBitmapHeight = SkScalarToFloat(destRectTarget.height());
// Compute the resampling mode.
ResamplingMode resampling;
if (context->platformContext()->isAccelerated() || context->platformContext()->printing())
resampling = RESAMPLE_LINEAR;
else
resampling = computeResamplingMode(totalMatrix, *bitmap, normSrcRect.width(), normSrcRect.height(), destBitmapWidth, destBitmapHeight);
resampling = limitResamplingMode(context->platformContext(), resampling);
// Load the transform WebKit requested.
SkMatrix matrix(patternTransform);
SkShader* shader;
if (resampling == RESAMPLE_AWESOME) {
// Do nice resampling.
float scaleX = destBitmapWidth / normSrcRect.width();
float scaleY = destBitmapHeight / normSrcRect.height();
SkRect scaledSrcRect;
SkIRect enclosingScaledSrcRect;
// The image fragment generated here is not exactly what is
// requested. The scale factor used is approximated and image
// fragment is slightly larger to align to integer
// boundaries.
SkBitmap resampled = extractScaledImageFragment(*bitmap, normSrcRect, scaleX, scaleY, &scaledSrcRect, &enclosingScaledSrcRect);
shader = SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
// Since we just resized the bitmap, we need to remove the scale
// applied to the pixels in the bitmap shader. This means we need
// CTM * patternTransform to have identity scale. Since we
// can't modify CTM (or the rectangle will be drawn in the wrong
// place), we must set patternTransform's scale to the inverse of
// CTM scale.
matrix.setScaleX(ctm.getScaleX() ? 1 / ctm.getScaleX() : 1);
matrix.setScaleY(ctm.getScaleY() ? 1 / ctm.getScaleY() : 1);
} else {
// No need to do nice resampling.
SkBitmap srcSubset;
bitmap->bitmap().extractSubset(&srcSubset, enclosingIntRect(normSrcRect));
shader = SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
}
// We also need to translate it such that the origin of the pattern is the
// origin of the destination rect, which is what WebKit expects. Skia uses
// the coordinate system origin as the base for the patter. If WebKit wants
// a shifted image, it will shift it from there using the patternTransform.
float adjustedX = phase.x() + normSrcRect.x() *
narrowPrecisionToFloat(patternTransform.a());
float adjustedY = phase.y() + normSrcRect.y() *
narrowPrecisionToFloat(patternTransform.d());
matrix.postTranslate(SkFloatToScalar(adjustedX),
SkFloatToScalar(adjustedY));
shader->setLocalMatrix(matrix);
SkPaint paint;
paint.setShader(shader)->unref();
paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp));
paint.setFilterBitmap(resampling == RESAMPLE_LINEAR);
context->platformContext()->paintSkPaint(destRect, paint);
}
void NativeImageSkia::drawPattern(
GraphicsContext* context,
const FloatRect& floatSrcRect,
const FloatSize& scale,
const FloatPoint& phase,
CompositeOperator compositeOp,
const FloatRect& destRect,
WebBlendMode blendMode,
const IntSize& repeatSpacing) const
{
FloatRect normSrcRect = floatSrcRect;
normSrcRect.intersect(FloatRect(0, 0, bitmap().width(), bitmap().height()));
if (destRect.isEmpty() || normSrcRect.isEmpty())
return; // nothing to draw
SkMatrix totalMatrix = context->getTotalMatrix();
AffineTransform ctm = context->getCTM();
SkScalar ctmScaleX = ctm.xScale();
SkScalar ctmScaleY = ctm.yScale();
totalMatrix.preScale(scale.width(), scale.height());
// Figure out what size the bitmap will be in the destination. The
// destination rect is the bounds of the pattern, we need to use the
// matrix to see how big it will be.
SkRect destRectTarget;
totalMatrix.mapRect(&destRectTarget, normSrcRect);
float destBitmapWidth = SkScalarToFloat(destRectTarget.width());
float destBitmapHeight = SkScalarToFloat(destRectTarget.height());
bool isLazyDecoded = DeferredImageDecoder::isLazyDecoded(bitmap());
// Compute the resampling mode.
InterpolationQuality resampling;
if (context->isAccelerated())
resampling = InterpolationLow;
else if (isLazyDecoded)
resampling = InterpolationHigh;
else
resampling = computeInterpolationQuality(totalMatrix, normSrcRect.width(), normSrcRect.height(), destBitmapWidth, destBitmapHeight, isDataComplete());
resampling = limitInterpolationQuality(context, resampling);
SkMatrix localMatrix;
// We also need to translate it such that the origin of the pattern is the
// origin of the destination rect, which is what WebKit expects. Skia uses
// the coordinate system origin as the base for the pattern. If WebKit wants
// a shifted image, it will shift it from there using the localMatrix.
const float adjustedX = phase.x() + normSrcRect.x() * scale.width();
const float adjustedY = phase.y() + normSrcRect.y() * scale.height();
localMatrix.setTranslate(SkFloatToScalar(adjustedX), SkFloatToScalar(adjustedY));
RefPtr<SkShader> shader;
SkFilterQuality filterLevel = static_cast<SkFilterQuality>(resampling);
// Bicubic filter is only applied to defer-decoded images, see
// NativeImageSkia::draw for details.
if (resampling == InterpolationHigh && !isLazyDecoded) {
// Do nice resampling.
filterLevel = kNone_SkFilterQuality;
float scaleX = destBitmapWidth / normSrcRect.width();
float scaleY = destBitmapHeight / normSrcRect.height();
SkRect scaledSrcRect;
// Since we are resizing the bitmap, we need to remove the scale
// applied to the pixels in the bitmap shader. This means we need
// CTM * localMatrix to have identity scale. Since we
// can't modify CTM (or the rectangle will be drawn in the wrong
// place), we must set localMatrix's scale to the inverse of
// CTM scale.
localMatrix.preScale(ctmScaleX ? 1 / ctmScaleX : 1, ctmScaleY ? 1 / ctmScaleY : 1);
// The image fragment generated here is not exactly what is
// requested. The scale factor used is approximated and image
// fragment is slightly larger to align to integer
// boundaries.
SkBitmap resampled = extractScaledImageFragment(normSrcRect, scaleX, scaleY, &scaledSrcRect);
if (repeatSpacing.isZero()) {
shader = adoptRef(SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
} else {
shader = adoptRef(SkShader::CreateBitmapShader(
createBitmapWithSpace(resampled, repeatSpacing.width() * ctmScaleX, repeatSpacing.height() * ctmScaleY),
SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
}
} else {
// Because no resizing occurred, the shader transform should be
// set to the pattern's transform, which just includes scale.
localMatrix.preScale(scale.width(), scale.height());
// No need to resample before drawing.
SkBitmap srcSubset;
bitmap().extractSubset(&srcSubset, enclosingIntRect(normSrcRect));
if (repeatSpacing.isZero()) {
shader = adoptRef(SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
} else {
shader = adoptRef(SkShader::CreateBitmapShader(
createBitmapWithSpace(srcSubset, repeatSpacing.width() * ctmScaleX, repeatSpacing.height() * ctmScaleY),
SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
}
}
SkPaint paint;
paint.setShader(shader.get());
paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp, blendMode));
paint.setColorFilter(context->colorFilter());
paint.setFilterQuality(filterLevel);
context->drawRect(destRect, paint);
}
void PlatformGraphicsContext::setCompositeOperation(CompositeOperator op)
{
m_state->mode = WebCoreCompositeToSkiaComposite(op);
}
void Image::drawPattern(GraphicsContext* context,
const FloatRect& floatSrcRect,
const AffineTransform& patternTransform,
const FloatPoint& phase,
ColorSpace styleColorSpace,
CompositeOperator compositeOp,
const FloatRect& destRect)
{
FloatRect normSrcRect = normalizeRect(floatSrcRect);
if (destRect.isEmpty() || normSrcRect.isEmpty())
return; // nothing to draw
NativeImageSkia* bitmap = nativeImageForCurrentFrame();
if (!bitmap)
return;
SkIRect srcRect = enclosingIntRect(normSrcRect);
// Figure out what size the bitmap will be in the destination. The
// destination rect is the bounds of the pattern, we need to use the
// matrix to see how big it will be.
float destBitmapWidth, destBitmapHeight;
TransformDimensions(patternTransform, srcRect.width(), srcRect.height(),
&destBitmapWidth, &destBitmapHeight);
// Compute the resampling mode.
ResamplingMode resampling;
if (context->platformContext()->isAccelerated() || context->platformContext()->printing())
resampling = RESAMPLE_LINEAR;
else
resampling = computeResamplingMode(context->platformContext(), *bitmap, srcRect.width(), srcRect.height(), destBitmapWidth, destBitmapHeight);
// Load the transform WebKit requested.
SkMatrix matrix(patternTransform);
SkShader* shader;
if (resampling == RESAMPLE_AWESOME) {
// Do nice resampling.
int width = static_cast<int>(destBitmapWidth);
int height = static_cast<int>(destBitmapHeight);
SkBitmap resampled = bitmap->resizedBitmap(srcRect, width, height);
shader = SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
// Since we just resized the bitmap, we need to undo the scale set in
// the image transform.
matrix.setScaleX(SkIntToScalar(1));
matrix.setScaleY(SkIntToScalar(1));
} else {
// No need to do nice resampling.
SkBitmap srcSubset;
bitmap->bitmap().extractSubset(&srcSubset, srcRect);
shader = SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
}
// We also need to translate it such that the origin of the pattern is the
// origin of the destination rect, which is what WebKit expects. Skia uses
// the coordinate system origin as the base for the patter. If WebKit wants
// a shifted image, it will shift it from there using the patternTransform.
float adjustedX = phase.x() + normSrcRect.x() *
narrowPrecisionToFloat(patternTransform.a());
float adjustedY = phase.y() + normSrcRect.y() *
narrowPrecisionToFloat(patternTransform.d());
matrix.postTranslate(SkFloatToScalar(adjustedX),
SkFloatToScalar(adjustedY));
shader->setLocalMatrix(matrix);
SkPaint paint;
paint.setShader(shader)->unref();
paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp));
paint.setFilterBitmap(resampling == RESAMPLE_LINEAR);
context->platformContext()->paintSkPaint(destRect, paint);
}
