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Bug 1341156 - Move nsImageRenderer to a separate file. r=mattwoodrow

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MozReview-Commit-ID: EIEl3Jbtcsi
This commit is contained in:
Morris Tseng 2017-03-13 11:46:04 +08:00
parent 11f13fedeb
commit 3756e950d3
6 changed files with 1156 additions and 1127 deletions
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2
layout/painting/moz.build
View File

@ -20,6 +20,7 @@ EXPORTS += [
'nsDisplayItemTypesList.h',
'nsDisplayList.h',
'nsDisplayListInvalidation.h',
'nsImageRenderer.h',
]
EXPORTS.mozilla += [
@ -40,6 +41,7 @@ UNIFIED_SOURCES += [
'nsCSSRenderingBorders.cpp',
'nsDisplayList.cpp',
'nsDisplayListInvalidation.cpp',
'nsImageRenderer.cpp',
'PaintTracker.cpp',
]

861
layout/painting/nsCSSRendering.cpp
View File

@ -5345,867 +5345,6 @@ nsCSSRendering::GetTextDecorationRectInternal(const Point& aPt,
return r;
}
// ------------------
// ImageRenderer
// ------------------
nsImageRenderer::nsImageRenderer(nsIFrame* aForFrame,
const nsStyleImage* aImage,
uint32_t aFlags)
: mForFrame(aForFrame)
, mImage(aImage)
, mType(aImage->GetType())
, mImageContainer(nullptr)
, mGradientData(nullptr)
, mPaintServerFrame(nullptr)
, mPrepareResult(DrawResult::NOT_READY)
, mSize(0, 0)
, mFlags(aFlags)
, mExtendMode(ExtendMode::CLAMP)
, mMaskOp(NS_STYLE_MASK_MODE_MATCH_SOURCE)
{
}
nsImageRenderer::~nsImageRenderer()
{
}
static bool
ShouldTreatAsCompleteDueToSyncDecode(const nsStyleImage* aImage,
uint32_t aFlags)
{
if (!(aFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES)) {
return false;
}
if (aImage->GetType() != eStyleImageType_Image) {
return false;
}
imgRequestProxy* req = aImage->GetImageData();
if (!req) {
return false;
}
uint32_t status = 0;
if (NS_FAILED(req->GetImageStatus(&status))) {
return false;
}
if (status & imgIRequest::STATUS_ERROR) {
// The image is "complete" since it's a corrupt image. If we created an
// imgIContainer at all, return true.
nsCOMPtr<imgIContainer> image;
req->GetImage(getter_AddRefs(image));
return bool(image);
}
if (!(status & imgIRequest::STATUS_LOAD_COMPLETE)) {
// We must have loaded all of the image's data and the size must be
// available, or else sync decoding won't be able to decode the image.
return false;
}
return true;
}
bool
nsImageRenderer::PrepareImage()
{
if (mImage->IsEmpty()) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
if (!mImage->IsComplete()) {
// Make sure the image is actually decoding.
bool frameComplete = mImage->StartDecoding();
// Check again to see if we finished.
// We cannot prepare the image for rendering if it is not fully loaded.
// Special case: If we requested a sync decode and the image has loaded, push
// on through because the Draw() will do a sync decode then.
if (!(frameComplete || mImage->IsComplete()) &&
!ShouldTreatAsCompleteDueToSyncDecode(mImage, mFlags)) {
mPrepareResult = DrawResult::NOT_READY;
return false;
}
}
switch (mType) {
case eStyleImageType_Image: {
MOZ_ASSERT(mImage->GetImageData(),
"must have image data, since we checked IsEmpty above");
nsCOMPtr<imgIContainer> srcImage;
DebugOnly<nsresult> rv =
mImage->GetImageData()->GetImage(getter_AddRefs(srcImage));
MOZ_ASSERT(NS_SUCCEEDED(rv) && srcImage,
"If GetImage() is failing, mImage->IsComplete() "
"should have returned false");
if (!mImage->GetCropRect()) {
mImageContainer.swap(srcImage);
} else {
nsIntRect actualCropRect;
bool isEntireImage;
bool success =
mImage->ComputeActualCropRect(actualCropRect, &isEntireImage);
NS_ASSERTION(success, "ComputeActualCropRect() should not fail here");
if (!success || actualCropRect.IsEmpty()) {
// The cropped image has zero size
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
if (isEntireImage) {
// The cropped image is identical to the source image
mImageContainer.swap(srcImage);
} else {
nsCOMPtr<imgIContainer> subImage = ImageOps::Clip(srcImage,
actualCropRect,
Nothing());
mImageContainer.swap(subImage);
}
}
mPrepareResult = DrawResult::SUCCESS;
break;
}
case eStyleImageType_Gradient:
mGradientData = mImage->GetGradientData();
mPrepareResult = DrawResult::SUCCESS;
break;
case eStyleImageType_Element:
{
nsAutoString elementId =
NS_LITERAL_STRING("#") + nsDependentString(mImage->GetElementId());
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mForFrame->GetContent()->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), elementId,
mForFrame->GetContent()->GetUncomposedDoc(), base);
nsSVGPaintingProperty* property = nsSVGEffects::GetPaintingPropertyForURI(
targetURI, mForFrame->FirstContinuation(),
nsSVGEffects::BackgroundImageProperty());
if (!property) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
// If the referenced element is an <img>, <canvas>, or <video> element,
// prefer SurfaceFromElement as it's more reliable.
mImageElementSurface =
nsLayoutUtils::SurfaceFromElement(property->GetReferencedElement());
if (!mImageElementSurface.GetSourceSurface()) {
mPaintServerFrame = property->GetReferencedFrame();
if (!mPaintServerFrame) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
}
mPrepareResult = DrawResult::SUCCESS;
break;
}
case eStyleImageType_Null:
default:
break;
}
return IsReady();
}
nsSize
CSSSizeOrRatio::ComputeConcreteSize() const
{
NS_ASSERTION(CanComputeConcreteSize(), "Cannot compute");
if (mHasWidth && mHasHeight) {
return nsSize(mWidth, mHeight);
}
if (mHasWidth) {
nscoord height = NSCoordSaturatingNonnegativeMultiply(
mWidth,
double(mRatio.height) / mRatio.width);
return nsSize(mWidth, height);
}
MOZ_ASSERT(mHasHeight);
nscoord width = NSCoordSaturatingNonnegativeMultiply(
mHeight,
double(mRatio.width) / mRatio.height);
return nsSize(width, mHeight);
}
CSSSizeOrRatio
nsImageRenderer::ComputeIntrinsicSize()
{
NS_ASSERTION(IsReady(), "Ensure PrepareImage() has returned true "
"before calling me");
CSSSizeOrRatio result;
switch (mType) {
case eStyleImageType_Image:
{
bool haveWidth, haveHeight;
CSSIntSize imageIntSize;
nsLayoutUtils::ComputeSizeForDrawing(mImageContainer, imageIntSize,
result.mRatio, haveWidth, haveHeight);
if (haveWidth) {
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(imageIntSize.width));
}
if (haveHeight) {
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(imageIntSize.height));
}
// If we know the aspect ratio and one of the dimensions,
// we can compute the other missing width or height.
if (!haveHeight && haveWidth && result.mRatio.width != 0) {
nscoord intrinsicHeight =
NSCoordSaturatingNonnegativeMultiply(imageIntSize.width,
float(result.mRatio.height) /
float(result.mRatio.width));
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(intrinsicHeight));
} else if (haveHeight && !haveWidth && result.mRatio.height != 0) {
nscoord intrinsicWidth =
NSCoordSaturatingNonnegativeMultiply(imageIntSize.height,
float(result.mRatio.width) /
float(result.mRatio.height));
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(intrinsicWidth));
}
break;
}
case eStyleImageType_Element:
{
// XXX element() should have the width/height of the referenced element,
// and that element's ratio, if it matches. If it doesn't match, it
// should have no width/height or ratio. See element() in CSS images:
// <http://dev.w3.org/csswg/css-images-4/#element-notation>.
// Make sure to change nsStyleImageLayers::Size::DependsOnFrameSize
// when fixing this!
if (mPaintServerFrame) {
// SVG images have no intrinsic size
if (!mPaintServerFrame->IsFrameOfType(nsIFrame::eSVG)) {
// The intrinsic image size for a generic nsIFrame paint server is
// the union of the border-box rects of all of its continuations,
// rounded to device pixels.
int32_t appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
result.SetSize(
IntSizeToAppUnits(
nsSVGIntegrationUtils::GetContinuationUnionSize(mPaintServerFrame).
ToNearestPixels(appUnitsPerDevPixel),
appUnitsPerDevPixel));
}
} else {
NS_ASSERTION(mImageElementSurface.GetSourceSurface(),
"Surface should be ready.");
IntSize surfaceSize = mImageElementSurface.mSize;
result.SetSize(
nsSize(nsPresContext::CSSPixelsToAppUnits(surfaceSize.width),
nsPresContext::CSSPixelsToAppUnits(surfaceSize.height)));
}
break;
}
case eStyleImageType_Gradient:
// Per <http://dev.w3.org/csswg/css3-images/#gradients>, gradients have no
// intrinsic dimensions.
case eStyleImageType_Null:
default:
break;
}
return result;
}
/* static */ nsSize
nsImageRenderer::ComputeConcreteSize(const CSSSizeOrRatio& aSpecifiedSize,
const CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize)
{
// The specified size is fully specified, just use that
if (aSpecifiedSize.IsConcrete()) {
return aSpecifiedSize.ComputeConcreteSize();
}
MOZ_ASSERT(!aSpecifiedSize.mHasWidth || !aSpecifiedSize.mHasHeight);
if (!aSpecifiedSize.mHasWidth && !aSpecifiedSize.mHasHeight) {
// no specified size, try using the intrinsic size
if (aIntrinsicSize.CanComputeConcreteSize()) {
return aIntrinsicSize.ComputeConcreteSize();
}
if (aIntrinsicSize.mHasWidth) {
return nsSize(aIntrinsicSize.mWidth, aDefaultSize.height);
}
if (aIntrinsicSize.mHasHeight) {
return nsSize(aDefaultSize.width, aIntrinsicSize.mHeight);
}
// couldn't use the intrinsic size either, revert to using the default size
return ComputeConstrainedSize(aDefaultSize,
aIntrinsicSize.mRatio,
CONTAIN);
}
MOZ_ASSERT(aSpecifiedSize.mHasWidth || aSpecifiedSize.mHasHeight);
// The specified height is partial, try to compute the missing part.
if (aSpecifiedSize.mHasWidth) {
nscoord height;
if (aIntrinsicSize.HasRatio()) {
height = NSCoordSaturatingNonnegativeMultiply(
aSpecifiedSize.mWidth,
double(aIntrinsicSize.mRatio.height) / aIntrinsicSize.mRatio.width);
} else if (aIntrinsicSize.mHasHeight) {
height = aIntrinsicSize.mHeight;
} else {
height = aDefaultSize.height;
}
return nsSize(aSpecifiedSize.mWidth, height);
}
MOZ_ASSERT(aSpecifiedSize.mHasHeight);
nscoord width;
if (aIntrinsicSize.HasRatio()) {
width = NSCoordSaturatingNonnegativeMultiply(
aSpecifiedSize.mHeight,
double(aIntrinsicSize.mRatio.width) / aIntrinsicSize.mRatio.height);
} else if (aIntrinsicSize.mHasWidth) {
width = aIntrinsicSize.mWidth;
} else {
width = aDefaultSize.width;
}
return nsSize(width, aSpecifiedSize.mHeight);
}
/* static */ nsSize
nsImageRenderer::ComputeConstrainedSize(const nsSize& aConstrainingSize,
const nsSize& aIntrinsicRatio,
FitType aFitType)
{
if (aIntrinsicRatio.width <= 0 && aIntrinsicRatio.height <= 0) {
return aConstrainingSize;
}
float scaleX = double(aConstrainingSize.width) / aIntrinsicRatio.width;
float scaleY = double(aConstrainingSize.height) / aIntrinsicRatio.height;
nsSize size;
if ((aFitType == CONTAIN) == (scaleX < scaleY)) {
size.width = aConstrainingSize.width;
size.height = NSCoordSaturatingNonnegativeMultiply(
aIntrinsicRatio.height, scaleX);
// If we're reducing the size by less than one css pixel, then just use the
// constraining size.
if (aFitType == CONTAIN && aConstrainingSize.height - size.height < nsPresContext::AppUnitsPerCSSPixel()) {
size.height = aConstrainingSize.height;
}
} else {
size.width = NSCoordSaturatingNonnegativeMultiply(
aIntrinsicRatio.width, scaleY);
if (aFitType == CONTAIN && aConstrainingSize.width - size.width < nsPresContext::AppUnitsPerCSSPixel()) {
size.width = aConstrainingSize.width;
}
size.height = aConstrainingSize.height;
}
return size;
}
/**
* mSize is the image's "preferred" size for this particular rendering, while
* the drawn (aka concrete) size is the actual rendered size after accounting
* for background-size etc.. The preferred size is most often the image's
* intrinsic dimensions. But for images with incomplete intrinsic dimensions,
* the preferred size varies, depending on the specified and default sizes, see
* nsImageRenderer::Compute*Size.
*
* This distinction is necessary because the components of a vector image are
* specified with respect to its preferred size for a rendering situation, not
* to its actual rendered size. For example, consider a 4px wide background
* vector image with no height which contains a left-aligned
* 2px wide black rectangle with height 100%. If the background-size width is
* auto (or 4px), the vector image will render 4px wide, and the black rectangle
* will be 2px wide. If the background-size width is 8px, the vector image will
* render 8px wide, and the black rectangle will be 4px wide -- *not* 2px wide.
* In both cases mSize.width will be 4px; but in the first case the returned
* width will be 4px, while in the second case the returned width will be 8px.
*/
void
nsImageRenderer::SetPreferredSize(const CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize)
{
mSize.width = aIntrinsicSize.mHasWidth
? aIntrinsicSize.mWidth
: aDefaultSize.width;
mSize.height = aIntrinsicSize.mHasHeight
? aIntrinsicSize.mHeight
: aDefaultSize.height;
}
// Convert from nsImageRenderer flags to the flags we want to use for drawing in
// the imgIContainer namespace.
static uint32_t
ConvertImageRendererToDrawFlags(uint32_t aImageRendererFlags)
{
uint32_t drawFlags = imgIContainer::FLAG_NONE;
if (aImageRendererFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
drawFlags |= imgIContainer::FLAG_SYNC_DECODE;
}
if (aImageRendererFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) {
drawFlags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
}
return drawFlags;
}
/*
* SVG11: A luminanceToAlpha operation is equivalent to the following matrix operation: |
* | R' | | 0 0 0 0 0 | | R |
* | G' | | 0 0 0 0 0 | | G |
* | B' | = | 0 0 0 0 0 | * | B |
* | A' | | 0.2125 0.7154 0.0721 0 0 | | A |
* | 1 | | 0 0 0 0 1 | | 1 |
*/
static void
RGBALuminanceOperation(uint8_t *aData,
int32_t aStride,
const IntSize &aSize)
{
int32_t redFactor = 55; // 256 * 0.2125
int32_t greenFactor = 183; // 256 * 0.7154
int32_t blueFactor = 18; // 256 * 0.0721
for (int32_t y = 0; y < aSize.height; y++) {
uint32_t *pixel = (uint32_t*)(aData + aStride * y);
for (int32_t x = 0; x < aSize.width; x++) {
*pixel = (((((*pixel & 0x00FF0000) >> 16) * redFactor) +
(((*pixel & 0x0000FF00) >> 8) * greenFactor) +
((*pixel & 0x000000FF) * blueFactor)) >> 8) << 24;
pixel++;
}
}
}
DrawResult
nsImageRenderer::Draw(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsSize& aRepeatSize,
const CSSIntRect& aSrc,
float aOpacity)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
DrawResult result = DrawResult::SUCCESS;
RefPtr<gfxContext> ctx = aRenderingContext.ThebesContext();
IntRect tmpDTRect;
if (ctx->CurrentOp() != CompositionOp::OP_OVER || mMaskOp == NS_STYLE_MASK_MODE_LUMINANCE) {
gfxRect clipRect = ctx->GetClipExtents();
tmpDTRect = RoundedOut(ToRect(clipRect));
if (tmpDTRect.IsEmpty()) {
return DrawResult::SUCCESS;
}
RefPtr<DrawTarget> tempDT =
gfxPlatform::GetPlatform()->CreateSimilarSoftwareDrawTarget(ctx->GetDrawTarget(),
tmpDTRect.Size(),
SurfaceFormat::B8G8R8A8);
if (!tempDT || !tempDT->IsValid()) {
gfxDevCrash(LogReason::InvalidContext) << "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
return DrawResult::TEMPORARY_ERROR;
}
tempDT->SetTransform(Matrix::Translation(-tmpDTRect.TopLeft()));
ctx = gfxContext::CreatePreservingTransformOrNull(tempDT);
if (!ctx) {
gfxDevCrash(LogReason::InvalidContext) << "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
return DrawResult::TEMPORARY_ERROR;
}
}
switch (mType) {
case eStyleImageType_Image:
{
CSSIntSize imageSize(nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height));
result =
nsLayoutUtils::DrawBackgroundImage(*ctx,
aPresContext,
mImageContainer, imageSize,
samplingFilter,
aDest, aFill, aRepeatSize,
aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags),
mExtendMode, aOpacity);
break;
}
case eStyleImageType_Gradient:
{
nsCSSRendering::PaintGradient(aPresContext, aRenderingContext,
mGradientData, aDirtyRect,
aDest, aFill, aRepeatSize, aSrc, mSize,
aOpacity);
break;
}
case eStyleImageType_Element:
{
RefPtr<gfxDrawable> drawable = DrawableForElement(aDest,
aRenderingContext);
if (!drawable) {
NS_WARNING("Could not create drawable for element");
return DrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
result =
nsLayoutUtils::DrawImage(*ctx,
aPresContext, image,
samplingFilter, aDest, aFill, aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags),
aOpacity);
break;
}
case eStyleImageType_Null:
default:
break;
}
if (!tmpDTRect.IsEmpty()) {
RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->Snapshot();
if (mMaskOp == NS_STYLE_MASK_MODE_LUMINANCE) {
RefPtr<DataSourceSurface> maskData = surf->GetDataSurface();
DataSourceSurface::MappedSurface map;
if (!maskData->Map(DataSourceSurface::MapType::WRITE, &map)) {
return result;
}
RGBALuminanceOperation(map.mData, map.mStride, maskData->GetSize());
maskData->Unmap();
surf = maskData;
}
DrawTarget* dt = aRenderingContext.ThebesContext()->GetDrawTarget();
dt->DrawSurface(surf, Rect(tmpDTRect.x, tmpDTRect.y, tmpDTRect.width, tmpDTRect.height),
Rect(0, 0, tmpDTRect.width, tmpDTRect.height),
DrawSurfaceOptions(SamplingFilter::POINT),
DrawOptions(1.0f, aRenderingContext.ThebesContext()->CurrentOp()));
}
return result;
}
already_AddRefed<gfxDrawable>
nsImageRenderer::DrawableForElement(const nsRect& aImageRect,
nsRenderingContext& aRenderingContext)
{
NS_ASSERTION(mType == eStyleImageType_Element,
"DrawableForElement only makes sense if backed by an element");
if (mPaintServerFrame) {
// XXX(seth): In order to not pass FLAG_SYNC_DECODE_IMAGES here,
// DrawableFromPaintServer would have to return a DrawResult indicating
// whether any images could not be painted because they weren't fully
// decoded. Even always passing FLAG_SYNC_DECODE_IMAGES won't eliminate all
// problems, as it won't help if there are image which haven't finished
// loading, but it's better than nothing.
int32_t appUnitsPerDevPixel = mForFrame->PresContext()->AppUnitsPerDevPixel();
nsRect destRect = aImageRect - aImageRect.TopLeft();
nsIntSize roundedOut = destRect.ToOutsidePixels(appUnitsPerDevPixel).Size();
IntSize imageSize(roundedOut.width, roundedOut.height);
RefPtr<gfxDrawable> drawable =
nsSVGIntegrationUtils::DrawableFromPaintServer(
mPaintServerFrame, mForFrame, mSize, imageSize,
aRenderingContext.GetDrawTarget(),
aRenderingContext.ThebesContext()->CurrentMatrix(),
nsSVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES);
return drawable.forget();
}
NS_ASSERTION(mImageElementSurface.GetSourceSurface(), "Surface should be ready.");
RefPtr<gfxDrawable> drawable = new gfxSurfaceDrawable(
mImageElementSurface.GetSourceSurface().get(),
mImageElementSurface.mSize);
return drawable.forget();
}
DrawResult
nsImageRenderer::DrawLayer(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsSize& aRepeatSize,
float aOpacity)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
return Draw(aPresContext, aRenderingContext,
aDirty, aDest, aFill, aAnchor, aRepeatSize,
CSSIntRect(0, 0,
nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
aOpacity);
}
/**
* Compute the size and position of the master copy of the image. I.e., a single
* tile used to fill the dest rect.
* aFill The destination rect to be filled
* aHFill and aVFill are the repeat patterns for the component -
* NS_STYLE_BORDER_IMAGE_REPEAT_* - i.e., how a tiling unit is used to fill aFill
* aUnitSize The size of the source rect in dest coords.
*/
static nsRect
ComputeTile(nsRect& aFill,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
nsSize& aRepeatSize)
{
nsRect tile;
switch (aHFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.x = aFill.x;
tile.width = aFill.width;
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
tile.width = aUnitSize.width;
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.x = aFill.x;
tile.width = ComputeRoundedSize(aUnitSize.width, aFill.width);
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_SPACE:
{
nscoord space;
aRepeatSize.width =
ComputeBorderSpacedRepeatSize(aUnitSize.width, aFill.width, space);
tile.x = aFill.x + space;
tile.width = aUnitSize.width;
aFill.x = tile.x;
aFill.width = aFill.width - space * 2;
}
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
switch (aVFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.y = aFill.y;
tile.height = aFill.height;
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
tile.height = aUnitSize.height;
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.y = aFill.y;
tile.height = ComputeRoundedSize(aUnitSize.height, aFill.height);
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_SPACE:
{
nscoord space;
aRepeatSize.height =
ComputeBorderSpacedRepeatSize(aUnitSize.height, aFill.height, space);
tile.y = aFill.y + space;
tile.height = aUnitSize.height;
aFill.y = tile.y;
aFill.height = aFill.height - space * 2;
}
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
return tile;
}
/**
* Returns true if the given set of arguments will require the tiles which fill
* the dest rect to be scaled from the source tile. See comment on ComputeTile
* for argument descriptions.
*/
static bool
RequiresScaling(const nsRect& aFill,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize)
{
// If we have no tiling in either direction, we can skip the intermediate
// scaling step.
return (aHFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH ||
aVFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH) &&
(aUnitSize.width != aFill.width ||
aUnitSize.height != aFill.height);
}
DrawResult
nsImageRenderer::DrawBorderImageComponent(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aFill,
const CSSIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
uint8_t aIndex,
const Maybe<nsSize>& aSVGViewportSize,
const bool aHasIntrinsicRatio)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::BAD_ARGS;
}
if (aFill.IsEmpty() || aSrc.IsEmpty()) {
return DrawResult::SUCCESS;
}
if (mType == eStyleImageType_Image || mType == eStyleImageType_Element) {
nsCOMPtr<imgIContainer> subImage;
// To draw one portion of an image into a border component, we stretch that
// portion to match the size of that border component and then draw onto.
// However, preserveAspectRatio attribute of a SVG image may break this rule.
// To get correct rendering result, we add
// FLAG_FORCE_PRESERVEASPECTRATIO_NONE flag here, to tell mImage to ignore
// preserveAspectRatio attribute, and always do non-uniform stretch.
uint32_t drawFlags = ConvertImageRendererToDrawFlags(mFlags) |
imgIContainer::FLAG_FORCE_PRESERVEASPECTRATIO_NONE;
// For those SVG image sources which don't have fixed aspect ratio (i.e.
// without viewport size and viewBox), we should scale the source uniformly
// after the viewport size is decided by "Default Sizing Algorithm".
if (!aHasIntrinsicRatio) {
drawFlags = drawFlags | imgIContainer::FLAG_FORCE_UNIFORM_SCALING;
}
// Retrieve or create the subimage we'll draw.
nsIntRect srcRect(aSrc.x, aSrc.y, aSrc.width, aSrc.height);
if (mType == eStyleImageType_Image) {
if ((subImage = mImage->GetSubImage(aIndex)) == nullptr) {
subImage = ImageOps::Clip(mImageContainer, srcRect, aSVGViewportSize);
mImage->SetSubImage(aIndex, subImage);
}
} else {
// This path, for eStyleImageType_Element, is currently slower than it
// needs to be because we don't cache anything. (In particular, if we have
// to draw to a temporary surface inside ClippedImage, we don't cache that
// temporary surface since we immediately throw the ClippedImage we create
// here away.) However, if we did cache, we'd need to know when to
// invalidate that cache, and it's not clear that it's worth the trouble
// since using border-image with -moz-element is rare.
RefPtr<gfxDrawable> drawable = DrawableForElement(nsRect(nsPoint(), mSize),
aRenderingContext);
if (!drawable) {
NS_WARNING("Could not create drawable for element");
return DrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
subImage = ImageOps::Clip(image, srcRect, aSVGViewportSize);
}
MOZ_ASSERT_IF(aSVGViewportSize,
subImage->GetType() == imgIContainer::TYPE_VECTOR);
SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
if (!RequiresScaling(aFill, aHFill, aVFill, aUnitSize)) {
return nsLayoutUtils::DrawSingleImage(*aRenderingContext.ThebesContext(),
aPresContext,
subImage,
samplingFilter,
aFill, aDirtyRect,
/* no SVGImageContext */ Nothing(),
drawFlags);
}
nsSize repeatSize;
nsRect fillRect(aFill);
nsRect tile = ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize);
CSSIntSize imageSize(srcRect.width, srcRect.height);
return nsLayoutUtils::DrawBackgroundImage(*aRenderingContext.ThebesContext(),
aPresContext,
subImage, imageSize, samplingFilter,
tile, fillRect, repeatSize,
tile.TopLeft(), aDirtyRect,
drawFlags,
ExtendMode::CLAMP, 1.0);
}
nsSize repeatSize(aFill.Size());
nsRect fillRect(aFill);
nsRect destTile = RequiresScaling(fillRect, aHFill, aVFill, aUnitSize)
? ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize)
: fillRect;
return Draw(aPresContext, aRenderingContext, aDirtyRect, destTile,
fillRect, destTile.TopLeft(), repeatSize, aSrc);
}
bool
nsImageRenderer::IsRasterImage()
{
if (mType != eStyleImageType_Image || !mImageContainer)
return false;
return mImageContainer->GetType() == imgIContainer::TYPE_RASTER;
}
bool
nsImageRenderer::IsAnimatedImage()
{
if (mType != eStyleImageType_Image || !mImageContainer)
return false;
bool animated = false;
if (NS_SUCCEEDED(mImageContainer->GetAnimated(&animated)) && animated)
return true;
return false;
}
already_AddRefed<imgIContainer>
nsImageRenderer::GetImage()
{
if (mType != eStyleImageType_Image || !mImageContainer) {
return nullptr;
}
nsCOMPtr<imgIContainer> image = mImageContainer;
return image.forget();
}
void
nsImageRenderer::PurgeCacheForViewportChange(
const Maybe<nsSize>& aSVGViewportSize, const bool aHasIntrinsicRatio)
{
// Check if we should flush the cached data - only vector images need to do
// the check since they might not have fixed ratio.
if (mImageContainer &&
mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
mImage->PurgeCacheForViewportChange(aSVGViewportSize, aHasIntrinsicRatio);
}
}
#define MAX_BLUR_RADIUS 300
#define MAX_SPREAD_RADIUS 50

268
layout/painting/nsCSSRendering.h
View File

@ -17,9 +17,9 @@
#include "nsLayoutUtils.h"
#include "nsStyleStruct.h"
#include "nsIFrame.h"
#include "nsImageRenderer.h"
#include "nsCSSRenderingBorders.h"
class gfxDrawable;
class nsStyleContext;
class nsPresContext;
class nsRenderingContext;
@ -35,72 +35,6 @@ namespace layers {
class ImageContainer;
} // namespace layers
// A CSSSizeOrRatio represents a (possibly partially specified) size for use
// in computing image sizes. Either or both of the width and height might be
// given. A ratio of width to height may also be given. If we at least two
// of these then we can compute a concrete size, that is a width and height.
struct CSSSizeOrRatio
{
CSSSizeOrRatio()
: mRatio(0, 0)
, mHasWidth(false)
, mHasHeight(false) {}
bool CanComputeConcreteSize() const
{
return mHasWidth + mHasHeight + HasRatio() >= 2;
}
bool IsConcrete() const { return mHasWidth && mHasHeight; }
bool HasRatio() const { return mRatio.width > 0 && mRatio.height > 0; }
bool IsEmpty() const
{
return (mHasWidth && mWidth <= 0) ||
(mHasHeight && mHeight <= 0) ||
mRatio.width <= 0 || mRatio.height <= 0;
}
// CanComputeConcreteSize must return true when ComputeConcreteSize is
// called.
nsSize ComputeConcreteSize() const;
void SetWidth(nscoord aWidth)
{
mWidth = aWidth;
mHasWidth = true;
if (mHasHeight) {
mRatio = nsSize(mWidth, mHeight);
}
}
void SetHeight(nscoord aHeight)
{
mHeight = aHeight;
mHasHeight = true;
if (mHasWidth) {
mRatio = nsSize(mWidth, mHeight);
}
}
void SetSize(const nsSize& aSize)
{
mWidth = aSize.width;
mHeight = aSize.height;
mHasWidth = true;
mHasHeight = true;
mRatio = aSize;
}
void SetRatio(const nsSize& aRatio)
{
MOZ_ASSERT(!mHasWidth || !mHasHeight,
"Probably shouldn't be setting a ratio if we have a concrete size");
mRatio = aRatio;
}
nsSize mRatio;
nscoord mWidth;
nscoord mHeight;
bool mHasWidth;
bool mHasHeight;
};
enum class PaintBorderFlags : uint8_t
{
SYNC_DECODE_IMAGES = 1 << 0
@ -109,205 +43,6 @@ MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(PaintBorderFlags)
} // namespace mozilla
/**
* This is a small wrapper class to encapsulate image drawing that can draw an
* nsStyleImage image, which may internally be a real image, a sub image, or a
* CSS gradient.
*
* @note Always call the member functions in the order of PrepareImage(),
* SetSize(), and Draw*().
*/
class nsImageRenderer {
public:
typedef mozilla::image::DrawResult DrawResult;
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::layers::ImageContainer ImageContainer;
enum {
FLAG_SYNC_DECODE_IMAGES = 0x01,
FLAG_PAINTING_TO_WINDOW = 0x02
};
enum FitType
{
CONTAIN,
COVER
};
nsImageRenderer(nsIFrame* aForFrame, const nsStyleImage* aImage, uint32_t aFlags);
~nsImageRenderer();
/**
* Populates member variables to get ready for rendering.
* @return true iff the image is ready, and there is at least a pixel to
* draw.
*/
bool PrepareImage();
/**
* The three Compute*Size functions correspond to the sizing algorthms and
* definitions from the CSS Image Values and Replaced Content spec. See
* http://dev.w3.org/csswg/css-images-3/#sizing .
*/
/**
* Compute the intrinsic size of the image as defined in the CSS Image Values
* spec. The intrinsic size is the unscaled size which the image would ideally
* like to be in app units.
*/
mozilla::CSSSizeOrRatio ComputeIntrinsicSize();
/**
* Computes the placement for a background image, or for the image data
* inside of a replaced element.
*
* @param aPos The CSS <position> value that specifies the image's position.
* @param aOriginBounds The box to which the tiling position should be
* relative. For background images, this should correspond to
* 'background-origin' for the frame, except when painting on the
* canvas, in which case the origin bounds should be the bounds
* of the root element's frame. For a replaced element, this should
* be the element's content-box.
* @param aTopLeft [out] The top-left corner where an image tile should be
* drawn.
* @param aAnchorPoint [out] A point which should be pixel-aligned by
* nsLayoutUtils::DrawImage. This is the same as aTopLeft, unless
* CSS specifies a percentage (including 'right' or 'bottom'), in
* which case it's that percentage within of aOriginBounds. So
* 'right' would set aAnchorPoint.x to aOriginBounds.XMost().
*
* Points are returned relative to aOriginBounds.
*/
static void ComputeObjectAnchorPoint(const mozilla::Position& aPos,
const nsSize& aOriginBounds,
const nsSize& aImageSize,
nsPoint* aTopLeft,
nsPoint* aAnchorPoint);
/**
* Compute the size of the rendered image using either the 'cover' or
* 'contain' constraints (aFitType).
* aIntrinsicRatio may be an invalid ratio, that is one or both of its
* dimensions can be less than or equal to zero.
*/
static nsSize ComputeConstrainedSize(const nsSize& aConstrainingSize,
const nsSize& aIntrinsicRatio,
FitType aFitType);
/**
* Compute the size of the rendered image (the concrete size) where no cover/
* contain constraints are given. The 'default algorithm' from the CSS Image
* Values spec.
*/
static nsSize ComputeConcreteSize(const mozilla::CSSSizeOrRatio& aSpecifiedSize,
const mozilla::CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize);
/**
* Set this image's preferred size. This will be its intrinsic size where
* specified and the default size where it is not. Used as the unscaled size
* when rendering the image.
*/
void SetPreferredSize(const mozilla::CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize);
/**
* Draws the image to the target rendering context using
* {background|mask}-specific arguments.
* @see nsLayoutUtils::DrawImage() for parameters.
*/
DrawResult DrawLayer(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsSize& aRepeatSize,
float aOpacity);
/**
* Draw the image to a single component of a border-image style rendering.
* aFill The destination rect to be drawn into
* aSrc is the part of the image to be rendered into a tile (aUnitSize in
* aFill), if aSrc and the dest tile are different sizes, the image will be
* scaled to map aSrc onto the dest tile.
* aHFill and aVFill are the repeat patterns for the component -
* NS_STYLE_BORDER_IMAGE_REPEAT_*
* aUnitSize The scaled size of a single source rect (in destination coords)
* aIndex identifies the component: 0 1 2
* 3 4 5
* 6 7 8
* aSVGViewportSize The image size evaluated by default sizing algorithm.
* Pass Nothing() if we can read a valid viewport size or aspect-ratio from
* the drawing image directly, otherwise, pass Some() with viewport size
* evaluated from default sizing algorithm.
* aHasIntrinsicRatio is used to record if the source image has fixed
* intrinsic ratio.
*/
DrawResult
DrawBorderImageComponent(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aFill,
const mozilla::CSSIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
uint8_t aIndex,
const mozilla::Maybe<nsSize>& aSVGViewportSize,
const bool aHasIntrinsicRatio);
bool IsRasterImage();
bool IsAnimatedImage();
/// Retrieves the image associated with this nsImageRenderer, if there is one.
already_AddRefed<imgIContainer> GetImage();
bool IsReady() const { return mPrepareResult == DrawResult::SUCCESS; }
DrawResult PrepareResult() const { return mPrepareResult; }
void SetExtendMode(mozilla::gfx::ExtendMode aMode) { mExtendMode = aMode; }
void SetMaskOp(uint8_t aMaskOp) { mMaskOp = aMaskOp; }
void PurgeCacheForViewportChange(const mozilla::Maybe<nsSize>& aSVGViewportSize,
const bool aHasRatio);
private:
/**
* Draws the image to the target rendering context.
* aSrc is a rect on the source image which will be mapped to aDest; it's
* currently only used for gradients.
*
* @see nsLayoutUtils::DrawImage() for other parameters.
*/
DrawResult Draw(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsSize& aRepeatSize,
const mozilla::CSSIntRect& aSrc,
float aOpacity = 1.0);
/**
* Helper method for creating a gfxDrawable from mPaintServerFrame or
* mImageElementSurface.
* Requires mType is eStyleImageType_Element.
* Returns null if we cannot create the drawable.
*/
already_AddRefed<gfxDrawable> DrawableForElement(const nsRect& aImageRect,
nsRenderingContext& aRenderingContext);
nsIFrame* mForFrame;
const nsStyleImage* mImage;
nsStyleImageType mType;
nsCOMPtr<imgIContainer> mImageContainer;
RefPtr<nsStyleGradient> mGradientData;
nsIFrame* mPaintServerFrame;
nsLayoutUtils::SurfaceFromElementResult mImageElementSurface;
DrawResult mPrepareResult;
nsSize mSize; // unscaled size of the image, in app units
uint32_t mFlags;
mozilla::gfx::ExtendMode mExtendMode;
uint8_t mMaskOp;
};
/**
* A struct representing all the information needed to paint a background
* image to some target, taking into account all CSS background-* properties.
@ -315,6 +50,7 @@ private:
*/
struct nsBackgroundLayerState {
typedef mozilla::gfx::CompositionOp CompositionOp;
typedef mozilla::nsImageRenderer nsImageRenderer;
/**
* @param aFlags some combination of nsCSSRendering::PAINTBG_* flags

1
layout/painting/nsCSSRenderingBorders.h
View File

@ -15,6 +15,7 @@
#include "mozilla/RefPtr.h"
#include "nsColor.h"
#include "nsCOMPtr.h"
#include "nsImageRenderer.h"
#include "nsStyleConsts.h"
#include "nsStyleStruct.h"
#include "nsPresContext.h"

868
layout/painting/nsImageRenderer.cpp Normal file
View File

@ -0,0 +1,868 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=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/. */
/* utility functions for drawing borders and backgrounds */
#include "nsImageRenderer.h"
nsSize
CSSSizeOrRatio::ComputeConcreteSize() const
{
NS_ASSERTION(CanComputeConcreteSize(), "Cannot compute");
if (mHasWidth && mHasHeight) {
return nsSize(mWidth, mHeight);
}
if (mHasWidth) {
nscoord height = NSCoordSaturatingNonnegativeMultiply(
mWidth,
double(mRatio.height) / mRatio.width);
return nsSize(mWidth, height);
}
MOZ_ASSERT(mHasHeight);
nscoord width = NSCoordSaturatingNonnegativeMultiply(
mHeight,
double(mRatio.width) / mRatio.height);
return nsSize(width, mHeight);
}
nsImageRenderer::nsImageRenderer(nsIFrame* aForFrame,
const nsStyleImage* aImage,
uint32_t aFlags)
: mForFrame(aForFrame)
, mImage(aImage)
, mType(aImage->GetType())
, mImageContainer(nullptr)
, mGradientData(nullptr)
, mPaintServerFrame(nullptr)
, mPrepareResult(DrawResult::NOT_READY)
, mSize(0, 0)
, mFlags(aFlags)
, mExtendMode(ExtendMode::CLAMP)
, mMaskOp(NS_STYLE_MASK_MODE_MATCH_SOURCE)
{
}
nsImageRenderer::~nsImageRenderer()
{
}
static bool
ShouldTreatAsCompleteDueToSyncDecode(const nsStyleImage* aImage,
uint32_t aFlags)
{
if (!(aFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES)) {
return false;
}
if (aImage->GetType() != eStyleImageType_Image) {
return false;
}
imgRequestProxy* req = aImage->GetImageData();
if (!req) {
return false;
}
uint32_t status = 0;
if (NS_FAILED(req->GetImageStatus(&status))) {
return false;
}
if (status & imgIRequest::STATUS_ERROR) {
// The image is "complete" since it's a corrupt image. If we created an
// imgIContainer at all, return true.
nsCOMPtr<imgIContainer> image;
req->GetImage(getter_AddRefs(image));
return bool(image);
}
if (!(status & imgIRequest::STATUS_LOAD_COMPLETE)) {
// We must have loaded all of the image's data and the size must be
// available, or else sync decoding won't be able to decode the image.
return false;
}
return true;
}
bool
nsImageRenderer::PrepareImage()
{
if (mImage->IsEmpty()) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
if (!mImage->IsComplete()) {
// Make sure the image is actually decoding.
bool frameComplete = mImage->StartDecoding();
// Check again to see if we finished.
// We cannot prepare the image for rendering if it is not fully loaded.
// Special case: If we requested a sync decode and the image has loaded, push
// on through because the Draw() will do a sync decode then.
if (!(frameComplete || mImage->IsComplete()) &&
!ShouldTreatAsCompleteDueToSyncDecode(mImage, mFlags)) {
mPrepareResult = DrawResult::NOT_READY;
return false;
}
}
switch (mType) {
case eStyleImageType_Image: {
MOZ_ASSERT(mImage->GetImageData(),
"must have image data, since we checked IsEmpty above");
nsCOMPtr<imgIContainer> srcImage;
DebugOnly<nsresult> rv =
mImage->GetImageData()->GetImage(getter_AddRefs(srcImage));
MOZ_ASSERT(NS_SUCCEEDED(rv) && srcImage,
"If GetImage() is failing, mImage->IsComplete() "
"should have returned false");
if (!mImage->GetCropRect()) {
mImageContainer.swap(srcImage);
} else {
nsIntRect actualCropRect;
bool isEntireImage;
bool success =
mImage->ComputeActualCropRect(actualCropRect, &isEntireImage);
NS_ASSERTION(success, "ComputeActualCropRect() should not fail here");
if (!success || actualCropRect.IsEmpty()) {
// The cropped image has zero size
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
if (isEntireImage) {
// The cropped image is identical to the source image
mImageContainer.swap(srcImage);
} else {
nsCOMPtr<imgIContainer> subImage = ImageOps::Clip(srcImage,
actualCropRect,
Nothing());
mImageContainer.swap(subImage);
}
}
mPrepareResult = DrawResult::SUCCESS;
break;
}
case eStyleImageType_Gradient:
mGradientData = mImage->GetGradientData();
mPrepareResult = DrawResult::SUCCESS;
break;
case eStyleImageType_Element:
{
nsAutoString elementId =
NS_LITERAL_STRING("#") + nsDependentString(mImage->GetElementId());
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mForFrame->GetContent()->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), elementId,
mForFrame->GetContent()->GetUncomposedDoc(), base);
nsSVGPaintingProperty* property = nsSVGEffects::GetPaintingPropertyForURI(
targetURI, mForFrame->FirstContinuation(),
nsSVGEffects::BackgroundImageProperty());
if (!property) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
// If the referenced element is an <img>, <canvas>, or <video> element,
// prefer SurfaceFromElement as it's more reliable.
mImageElementSurface =
nsLayoutUtils::SurfaceFromElement(property->GetReferencedElement());
if (!mImageElementSurface.GetSourceSurface()) {
mPaintServerFrame = property->GetReferencedFrame();
if (!mPaintServerFrame) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
}
mPrepareResult = DrawResult::SUCCESS;
break;
}
case eStyleImageType_Null:
default:
break;
}
return IsReady();
}
CSSSizeOrRatio
nsImageRenderer::ComputeIntrinsicSize()
{
NS_ASSERTION(IsReady(), "Ensure PrepareImage() has returned true "
"before calling me");
CSSSizeOrRatio result;
switch (mType) {
case eStyleImageType_Image:
{
bool haveWidth, haveHeight;
CSSIntSize imageIntSize;
nsLayoutUtils::ComputeSizeForDrawing(mImageContainer, imageIntSize,
result.mRatio, haveWidth, haveHeight);
if (haveWidth) {
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(imageIntSize.width));
}
if (haveHeight) {
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(imageIntSize.height));
}
// If we know the aspect ratio and one of the dimensions,
// we can compute the other missing width or height.
if (!haveHeight && haveWidth && result.mRatio.width != 0) {
nscoord intrinsicHeight =
NSCoordSaturatingNonnegativeMultiply(imageIntSize.width,
float(result.mRatio.height) /
float(result.mRatio.width));
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(intrinsicHeight));
} else if (haveHeight && !haveWidth && result.mRatio.height != 0) {
nscoord intrinsicWidth =
NSCoordSaturatingNonnegativeMultiply(imageIntSize.height,
float(result.mRatio.width) /
float(result.mRatio.height));
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(intrinsicWidth));
}
break;
}
case eStyleImageType_Element:
{
// XXX element() should have the width/height of the referenced element,
// and that element's ratio, if it matches. If it doesn't match, it
// should have no width/height or ratio. See element() in CSS images:
// <http://dev.w3.org/csswg/css-images-4/#element-notation>.
// Make sure to change nsStyleImageLayers::Size::DependsOnFrameSize
// when fixing this!
if (mPaintServerFrame) {
// SVG images have no intrinsic size
if (!mPaintServerFrame->IsFrameOfType(nsIFrame::eSVG)) {
// The intrinsic image size for a generic nsIFrame paint server is
// the union of the border-box rects of all of its continuations,
// rounded to device pixels.
int32_t appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
result.SetSize(
IntSizeToAppUnits(
nsSVGIntegrationUtils::GetContinuationUnionSize(mPaintServerFrame).
ToNearestPixels(appUnitsPerDevPixel),
appUnitsPerDevPixel));
}
} else {
NS_ASSERTION(mImageElementSurface.GetSourceSurface(),
"Surface should be ready.");
IntSize surfaceSize = mImageElementSurface.mSize;
result.SetSize(
nsSize(nsPresContext::CSSPixelsToAppUnits(surfaceSize.width),
nsPresContext::CSSPixelsToAppUnits(surfaceSize.height)));
}
break;
}
case eStyleImageType_Gradient:
// Per <http://dev.w3.org/csswg/css3-images/#gradients>, gradients have no
// intrinsic dimensions.
case eStyleImageType_Null:
default:
break;
}
return result;
}
/* static */ nsSize
nsImageRenderer::ComputeConcreteSize(const CSSSizeOrRatio& aSpecifiedSize,
const CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize)
{
// The specified size is fully specified, just use that
if (aSpecifiedSize.IsConcrete()) {
return aSpecifiedSize.ComputeConcreteSize();
}
MOZ_ASSERT(!aSpecifiedSize.mHasWidth || !aSpecifiedSize.mHasHeight);
if (!aSpecifiedSize.mHasWidth && !aSpecifiedSize.mHasHeight) {
// no specified size, try using the intrinsic size
if (aIntrinsicSize.CanComputeConcreteSize()) {
return aIntrinsicSize.ComputeConcreteSize();
}
if (aIntrinsicSize.mHasWidth) {
return nsSize(aIntrinsicSize.mWidth, aDefaultSize.height);
}
if (aIntrinsicSize.mHasHeight) {
return nsSize(aDefaultSize.width, aIntrinsicSize.mHeight);
}
// couldn't use the intrinsic size either, revert to using the default size
return ComputeConstrainedSize(aDefaultSize,
aIntrinsicSize.mRatio,
CONTAIN);
}
MOZ_ASSERT(aSpecifiedSize.mHasWidth || aSpecifiedSize.mHasHeight);
// The specified height is partial, try to compute the missing part.
if (aSpecifiedSize.mHasWidth) {
nscoord height;
if (aIntrinsicSize.HasRatio()) {
height = NSCoordSaturatingNonnegativeMultiply(
aSpecifiedSize.mWidth,
double(aIntrinsicSize.mRatio.height) / aIntrinsicSize.mRatio.width);
} else if (aIntrinsicSize.mHasHeight) {
height = aIntrinsicSize.mHeight;
} else {
height = aDefaultSize.height;
}
return nsSize(aSpecifiedSize.mWidth, height);
}
MOZ_ASSERT(aSpecifiedSize.mHasHeight);
nscoord width;
if (aIntrinsicSize.HasRatio()) {
width = NSCoordSaturatingNonnegativeMultiply(
aSpecifiedSize.mHeight,
double(aIntrinsicSize.mRatio.width) / aIntrinsicSize.mRatio.height);
} else if (aIntrinsicSize.mHasWidth) {
width = aIntrinsicSize.mWidth;
} else {
width = aDefaultSize.width;
}
return nsSize(width, aSpecifiedSize.mHeight);
}
/* static */ nsSize
nsImageRenderer::ComputeConstrainedSize(const nsSize& aConstrainingSize,
const nsSize& aIntrinsicRatio,
FitType aFitType)
{
if (aIntrinsicRatio.width <= 0 && aIntrinsicRatio.height <= 0) {
return aConstrainingSize;
}
float scaleX = double(aConstrainingSize.width) / aIntrinsicRatio.width;
float scaleY = double(aConstrainingSize.height) / aIntrinsicRatio.height;
nsSize size;
if ((aFitType == CONTAIN) == (scaleX < scaleY)) {
size.width = aConstrainingSize.width;
size.height = NSCoordSaturatingNonnegativeMultiply(
aIntrinsicRatio.height, scaleX);
// If we're reducing the size by less than one css pixel, then just use the
// constraining size.
if (aFitType == CONTAIN && aConstrainingSize.height - size.height < nsPresContext::AppUnitsPerCSSPixel()) {
size.height = aConstrainingSize.height;
}
} else {
size.width = NSCoordSaturatingNonnegativeMultiply(
aIntrinsicRatio.width, scaleY);
if (aFitType == CONTAIN && aConstrainingSize.width - size.width < nsPresContext::AppUnitsPerCSSPixel()) {
size.width = aConstrainingSize.width;
}
size.height = aConstrainingSize.height;
}
return size;
}
/**
* mSize is the image's "preferred" size for this particular rendering, while
* the drawn (aka concrete) size is the actual rendered size after accounting
* for background-size etc.. The preferred size is most often the image's
* intrinsic dimensions. But for images with incomplete intrinsic dimensions,
* the preferred size varies, depending on the specified and default sizes, see
* nsImageRenderer::Compute*Size.
*
* This distinction is necessary because the components of a vector image are
* specified with respect to its preferred size for a rendering situation, not
* to its actual rendered size. For example, consider a 4px wide background
* vector image with no height which contains a left-aligned
* 2px wide black rectangle with height 100%. If the background-size width is
* auto (or 4px), the vector image will render 4px wide, and the black rectangle
* will be 2px wide. If the background-size width is 8px, the vector image will
* render 8px wide, and the black rectangle will be 4px wide -- *not* 2px wide.
* In both cases mSize.width will be 4px; but in the first case the returned
* width will be 4px, while in the second case the returned width will be 8px.
*/
void
nsImageRenderer::SetPreferredSize(const CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize)
{
mSize.width = aIntrinsicSize.mHasWidth
? aIntrinsicSize.mWidth
: aDefaultSize.width;
mSize.height = aIntrinsicSize.mHasHeight
? aIntrinsicSize.mHeight
: aDefaultSize.height;
}
// Convert from nsImageRenderer flags to the flags we want to use for drawing in
// the imgIContainer namespace.
static uint32_t
ConvertImageRendererToDrawFlags(uint32_t aImageRendererFlags)
{
uint32_t drawFlags = imgIContainer::FLAG_NONE;
if (aImageRendererFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
drawFlags |= imgIContainer::FLAG_SYNC_DECODE;
}
if (aImageRendererFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) {
drawFlags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
}
return drawFlags;
}
/*
* SVG11: A luminanceToAlpha operation is equivalent to the following matrix operation: |
* | R' | | 0 0 0 0 0 | | R |
* | G' | | 0 0 0 0 0 | | G |
* | B' | = | 0 0 0 0 0 | * | B |
* | A' | | 0.2125 0.7154 0.0721 0 0 | | A |
* | 1 | | 0 0 0 0 1 | | 1 |
*/
static void
RGBALuminanceOperation(uint8_t *aData,
int32_t aStride,
const IntSize &aSize)
{
int32_t redFactor = 55; // 256 * 0.2125
int32_t greenFactor = 183; // 256 * 0.7154
int32_t blueFactor = 18; // 256 * 0.0721
for (int32_t y = 0; y < aSize.height; y++) {
uint32_t *pixel = (uint32_t*)(aData + aStride * y);
for (int32_t x = 0; x < aSize.width; x++) {
*pixel = (((((*pixel & 0x00FF0000) >> 16) * redFactor) +
(((*pixel & 0x0000FF00) >> 8) * greenFactor) +
((*pixel & 0x000000FF) * blueFactor)) >> 8) << 24;
pixel++;
}
}
}
DrawResult
nsImageRenderer::Draw(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsSize& aRepeatSize,
const CSSIntRect& aSrc,
float aOpacity)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
DrawResult result = DrawResult::SUCCESS;
RefPtr<gfxContext> ctx = aRenderingContext.ThebesContext();
IntRect tmpDTRect;
if (ctx->CurrentOp() != CompositionOp::OP_OVER || mMaskOp == NS_STYLE_MASK_MODE_LUMINANCE) {
gfxRect clipRect = ctx->GetClipExtents();
tmpDTRect = RoundedOut(ToRect(clipRect));
if (tmpDTRect.IsEmpty()) {
return DrawResult::SUCCESS;
}
RefPtr<DrawTarget> tempDT =
gfxPlatform::GetPlatform()->CreateSimilarSoftwareDrawTarget(ctx->GetDrawTarget(),
tmpDTRect.Size(),
SurfaceFormat::B8G8R8A8);
if (!tempDT || !tempDT->IsValid()) {
gfxDevCrash(LogReason::InvalidContext) << "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
return DrawResult::TEMPORARY_ERROR;
}
tempDT->SetTransform(Matrix::Translation(-tmpDTRect.TopLeft()));
ctx = gfxContext::CreatePreservingTransformOrNull(tempDT);
if (!ctx) {
gfxDevCrash(LogReason::InvalidContext) << "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
return DrawResult::TEMPORARY_ERROR;
}
}
switch (mType) {
case eStyleImageType_Image:
{
CSSIntSize imageSize(nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height));
result =
nsLayoutUtils::DrawBackgroundImage(*ctx,
aPresContext,
mImageContainer, imageSize,
samplingFilter,
aDest, aFill, aRepeatSize,
aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags),
mExtendMode, aOpacity);
break;
}
case eStyleImageType_Gradient:
{
nsCSSRendering::PaintGradient(aPresContext, aRenderingContext,
mGradientData, aDirtyRect,
aDest, aFill, aRepeatSize, aSrc, mSize,
aOpacity);
break;
}
case eStyleImageType_Element:
{
RefPtr<gfxDrawable> drawable = DrawableForElement(aDest,
aRenderingContext);
if (!drawable) {
NS_WARNING("Could not create drawable for element");
return DrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
result =
nsLayoutUtils::DrawImage(*ctx,
aPresContext, image,
samplingFilter, aDest, aFill, aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags),
aOpacity);
break;
}
case eStyleImageType_Null:
default:
break;
}
if (!tmpDTRect.IsEmpty()) {
RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->Snapshot();
if (mMaskOp == NS_STYLE_MASK_MODE_LUMINANCE) {
RefPtr<DataSourceSurface> maskData = surf->GetDataSurface();
DataSourceSurface::MappedSurface map;
if (!maskData->Map(DataSourceSurface::MapType::WRITE, &map)) {
return result;
}
RGBALuminanceOperation(map.mData, map.mStride, maskData->GetSize());
maskData->Unmap();
surf = maskData;
}
DrawTarget* dt = aRenderingContext.ThebesContext()->GetDrawTarget();
dt->DrawSurface(surf, Rect(tmpDTRect.x, tmpDTRect.y, tmpDTRect.width, tmpDTRect.height),
Rect(0, 0, tmpDTRect.width, tmpDTRect.height),
DrawSurfaceOptions(SamplingFilter::POINT),
DrawOptions(1.0f, aRenderingContext.ThebesContext()->CurrentOp()));
}
return result;
}
already_AddRefed<gfxDrawable>
nsImageRenderer::DrawableForElement(const nsRect& aImageRect,
nsRenderingContext& aRenderingContext)
{
NS_ASSERTION(mType == eStyleImageType_Element,
"DrawableForElement only makes sense if backed by an element");
if (mPaintServerFrame) {
// XXX(seth): In order to not pass FLAG_SYNC_DECODE_IMAGES here,
// DrawableFromPaintServer would have to return a DrawResult indicating
// whether any images could not be painted because they weren't fully
// decoded. Even always passing FLAG_SYNC_DECODE_IMAGES won't eliminate all
// problems, as it won't help if there are image which haven't finished
// loading, but it's better than nothing.
int32_t appUnitsPerDevPixel = mForFrame->PresContext()->AppUnitsPerDevPixel();
nsRect destRect = aImageRect - aImageRect.TopLeft();
nsIntSize roundedOut = destRect.ToOutsidePixels(appUnitsPerDevPixel).Size();
IntSize imageSize(roundedOut.width, roundedOut.height);
RefPtr<gfxDrawable> drawable =
nsSVGIntegrationUtils::DrawableFromPaintServer(
mPaintServerFrame, mForFrame, mSize, imageSize,
aRenderingContext.GetDrawTarget(),
aRenderingContext.ThebesContext()->CurrentMatrix(),
nsSVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES);
return drawable.forget();
}
NS_ASSERTION(mImageElementSurface.GetSourceSurface(), "Surface should be ready.");
RefPtr<gfxDrawable> drawable = new gfxSurfaceDrawable(
mImageElementSurface.GetSourceSurface().get(),
mImageElementSurface.mSize);
return drawable.forget();
}
DrawResult
nsImageRenderer::DrawLayer(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsSize& aRepeatSize,
float aOpacity)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
return Draw(aPresContext, aRenderingContext,
aDirty, aDest, aFill, aAnchor, aRepeatSize,
CSSIntRect(0, 0,
nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
aOpacity);
}
/**
* Compute the size and position of the master copy of the image. I.e., a single
* tile used to fill the dest rect.
* aFill The destination rect to be filled
* aHFill and aVFill are the repeat patterns for the component -
* NS_STYLE_BORDER_IMAGE_REPEAT_* - i.e., how a tiling unit is used to fill aFill
* aUnitSize The size of the source rect in dest coords.
*/
static nsRect
ComputeTile(nsRect& aFill,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
nsSize& aRepeatSize)
{
nsRect tile;
switch (aHFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.x = aFill.x;
tile.width = aFill.width;
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
tile.width = aUnitSize.width;
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.x = aFill.x;
tile.width = ComputeRoundedSize(aUnitSize.width, aFill.width);
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_SPACE:
{
nscoord space;
aRepeatSize.width =
ComputeBorderSpacedRepeatSize(aUnitSize.width, aFill.width, space);
tile.x = aFill.x + space;
tile.width = aUnitSize.width;
aFill.x = tile.x;
aFill.width = aFill.width - space * 2;
}
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
switch (aVFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.y = aFill.y;
tile.height = aFill.height;
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
tile.height = aUnitSize.height;
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.y = aFill.y;
tile.height = ComputeRoundedSize(aUnitSize.height, aFill.height);
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_SPACE:
{
nscoord space;
aRepeatSize.height =
ComputeBorderSpacedRepeatSize(aUnitSize.height, aFill.height, space);
tile.y = aFill.y + space;
tile.height = aUnitSize.height;
aFill.y = tile.y;
aFill.height = aFill.height - space * 2;
}
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
return tile;
}
/**
* Returns true if the given set of arguments will require the tiles which fill
* the dest rect to be scaled from the source tile. See comment on ComputeTile
* for argument descriptions.
*/
static bool
RequiresScaling(const nsRect& aFill,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize)
{
// If we have no tiling in either direction, we can skip the intermediate
// scaling step.
return (aHFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH ||
aVFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH) &&
(aUnitSize.width != aFill.width ||
aUnitSize.height != aFill.height);
}
DrawResult
nsImageRenderer::DrawBorderImageComponent(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aFill,
const CSSIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
uint8_t aIndex,
const Maybe<nsSize>& aSVGViewportSize,
const bool aHasIntrinsicRatio)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::BAD_ARGS;
}
if (aFill.IsEmpty() || aSrc.IsEmpty()) {
return DrawResult::SUCCESS;
}
if (mType == eStyleImageType_Image || mType == eStyleImageType_Element) {
nsCOMPtr<imgIContainer> subImage;
// To draw one portion of an image into a border component, we stretch that
// portion to match the size of that border component and then draw onto.
// However, preserveAspectRatio attribute of a SVG image may break this rule.
// To get correct rendering result, we add
// FLAG_FORCE_PRESERVEASPECTRATIO_NONE flag here, to tell mImage to ignore
// preserveAspectRatio attribute, and always do non-uniform stretch.
uint32_t drawFlags = ConvertImageRendererToDrawFlags(mFlags) |
imgIContainer::FLAG_FORCE_PRESERVEASPECTRATIO_NONE;
// For those SVG image sources which don't have fixed aspect ratio (i.e.
// without viewport size and viewBox), we should scale the source uniformly
// after the viewport size is decided by "Default Sizing Algorithm".
if (!aHasIntrinsicRatio) {
drawFlags = drawFlags | imgIContainer::FLAG_FORCE_UNIFORM_SCALING;
}
// Retrieve or create the subimage we'll draw.
nsIntRect srcRect(aSrc.x, aSrc.y, aSrc.width, aSrc.height);
if (mType == eStyleImageType_Image) {
if ((subImage = mImage->GetSubImage(aIndex)) == nullptr) {
subImage = ImageOps::Clip(mImageContainer, srcRect, aSVGViewportSize);
mImage->SetSubImage(aIndex, subImage);
}
} else {
// This path, for eStyleImageType_Element, is currently slower than it
// needs to be because we don't cache anything. (In particular, if we have
// to draw to a temporary surface inside ClippedImage, we don't cache that
// temporary surface since we immediately throw the ClippedImage we create
// here away.) However, if we did cache, we'd need to know when to
// invalidate that cache, and it's not clear that it's worth the trouble
// since using border-image with -moz-element is rare.
RefPtr<gfxDrawable> drawable = DrawableForElement(nsRect(nsPoint(), mSize),
aRenderingContext);
if (!drawable) {
NS_WARNING("Could not create drawable for element");
return DrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
subImage = ImageOps::Clip(image, srcRect, aSVGViewportSize);
}
MOZ_ASSERT_IF(aSVGViewportSize,
subImage->GetType() == imgIContainer::TYPE_VECTOR);
SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
if (!RequiresScaling(aFill, aHFill, aVFill, aUnitSize)) {
return nsLayoutUtils::DrawSingleImage(*aRenderingContext.ThebesContext(),
aPresContext,
subImage,
samplingFilter,
aFill, aDirtyRect,
/* no SVGImageContext */ Nothing(),
drawFlags);
}
nsSize repeatSize;
nsRect fillRect(aFill);
nsRect tile = ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize);
CSSIntSize imageSize(srcRect.width, srcRect.height);
return nsLayoutUtils::DrawBackgroundImage(*aRenderingContext.ThebesContext(),
aPresContext,
subImage, imageSize, samplingFilter,
tile, fillRect, repeatSize,
tile.TopLeft(), aDirtyRect,
drawFlags,
ExtendMode::CLAMP, 1.0);
}
nsSize repeatSize(aFill.Size());
nsRect fillRect(aFill);
nsRect destTile = RequiresScaling(fillRect, aHFill, aVFill, aUnitSize)
? ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize)
: fillRect;
return Draw(aPresContext, aRenderingContext, aDirtyRect, destTile,
fillRect, destTile.TopLeft(), repeatSize, aSrc);
}
bool
nsImageRenderer::IsRasterImage()
{
if (mType != eStyleImageType_Image || !mImageContainer)
return false;
return mImageContainer->GetType() == imgIContainer::TYPE_RASTER;
}
bool
nsImageRenderer::IsAnimatedImage()
{
if (mType != eStyleImageType_Image || !mImageContainer)
return false;
bool animated = false;
if (NS_SUCCEEDED(mImageContainer->GetAnimated(&animated)) && animated)
return true;
return false;
}
already_AddRefed<imgIContainer>
nsImageRenderer::GetImage()
{
if (mType != eStyleImageType_Image || !mImageContainer) {
return nullptr;
}
nsCOMPtr<imgIContainer> image = mImageContainer;
return image.forget();
}
void
nsImageRenderer::PurgeCacheForViewportChange(
const Maybe<nsSize>& aSVGViewportSize, const bool aHasIntrinsicRatio)
{
// Check if we should flush the cached data - only vector images need to do
// the check since they might not have fixed ratio.
if (mImageContainer &&
mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
mImage->PurgeCacheForViewportChange(aSVGViewportSize, aHasIntrinsicRatio);
}
}

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/* -*- 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/. */
#ifndef nsImageRenderer_h__
#define nsImageRenderer_h__
#include "nsLayoutUtils.h"
#include "nsStyleStruct.h"
#include "Units.h"
class gfxDrawable;
namespace mozilla {
// A CSSSizeOrRatio represents a (possibly partially specified) size for use
// in computing image sizes. Either or both of the width and height might be
// given. A ratio of width to height may also be given. If we at least two
// of these then we can compute a concrete size, that is a width and height.
struct CSSSizeOrRatio
{
CSSSizeOrRatio()
: mRatio(0, 0)
, mHasWidth(false)
, mHasHeight(false) {}
bool CanComputeConcreteSize() const
{
return mHasWidth + mHasHeight + HasRatio() >= 2;
}
bool IsConcrete() const { return mHasWidth && mHasHeight; }
bool HasRatio() const { return mRatio.width > 0 && mRatio.height > 0; }
bool IsEmpty() const
{
return (mHasWidth && mWidth <= 0) ||
(mHasHeight && mHeight <= 0) ||
mRatio.width <= 0 || mRatio.height <= 0;
}
// CanComputeConcreteSize must return true when ComputeConcreteSize is
// called.
nsSize ComputeConcreteSize() const;
void SetWidth(nscoord aWidth)
{
mWidth = aWidth;
mHasWidth = true;
if (mHasHeight) {
mRatio = nsSize(mWidth, mHeight);
}
}
void SetHeight(nscoord aHeight)
{
mHeight = aHeight;
mHasHeight = true;
if (mHasWidth) {
mRatio = nsSize(mWidth, mHeight);
}
}
void SetSize(const nsSize& aSize)
{
mWidth = aSize.width;
mHeight = aSize.height;
mHasWidth = true;
mHasHeight = true;
mRatio = aSize;
}
void SetRatio(const nsSize& aRatio)
{
MOZ_ASSERT(!mHasWidth || !mHasHeight,
"Probably shouldn't be setting a ratio if we have a concrete size");
mRatio = aRatio;
}
nsSize mRatio;
nscoord mWidth;
nscoord mHeight;
bool mHasWidth;
bool mHasHeight;
};
/**
* This is a small wrapper class to encapsulate image drawing that can draw an
* nsStyleImage image, which may internally be a real image, a sub image, or a
* CSS gradient.
*
* @note Always call the member functions in the order of PrepareImage(),
* SetSize(), and Draw*().
*/
class nsImageRenderer {
public:
typedef mozilla::image::DrawResult DrawResult;
typedef mozilla::layers::LayerManager LayerManager;
typedef mozilla::layers::ImageContainer ImageContainer;
enum {
FLAG_SYNC_DECODE_IMAGES = 0x01,
FLAG_PAINTING_TO_WINDOW = 0x02
};
enum FitType
{
CONTAIN,
COVER
};
nsImageRenderer(nsIFrame* aForFrame, const nsStyleImage* aImage, uint32_t aFlags);
~nsImageRenderer();
/**
* Populates member variables to get ready for rendering.
* @return true iff the image is ready, and there is at least a pixel to
* draw.
*/
bool PrepareImage();
/**
* The three Compute*Size functions correspond to the sizing algorthms and
* definitions from the CSS Image Values and Replaced Content spec. See
* http://dev.w3.org/csswg/css-images-3/#sizing .
*/
/**
* Compute the intrinsic size of the image as defined in the CSS Image Values
* spec. The intrinsic size is the unscaled size which the image would ideally
* like to be in app units.
*/
mozilla::CSSSizeOrRatio ComputeIntrinsicSize();
/**
* Computes the placement for a background image, or for the image data
* inside of a replaced element.
*
* @param aPos The CSS <position> value that specifies the image's position.
* @param aOriginBounds The box to which the tiling position should be
* relative. For background images, this should correspond to
* 'background-origin' for the frame, except when painting on the
* canvas, in which case the origin bounds should be the bounds
* of the root element's frame. For a replaced element, this should
* be the element's content-box.
* @param aTopLeft [out] The top-left corner where an image tile should be
* drawn.
* @param aAnchorPoint [out] A point which should be pixel-aligned by
* nsLayoutUtils::DrawImage. This is the same as aTopLeft, unless
* CSS specifies a percentage (including 'right' or 'bottom'), in
* which case it's that percentage within of aOriginBounds. So
* 'right' would set aAnchorPoint.x to aOriginBounds.XMost().
*
* Points are returned relative to aOriginBounds.
*/
static void ComputeObjectAnchorPoint(const mozilla::Position& aPos,
const nsSize& aOriginBounds,
const nsSize& aImageSize,
nsPoint* aTopLeft,
nsPoint* aAnchorPoint);
/**
* Compute the size of the rendered image using either the 'cover' or
* 'contain' constraints (aFitType).
* aIntrinsicRatio may be an invalid ratio, that is one or both of its
* dimensions can be less than or equal to zero.
*/
static nsSize ComputeConstrainedSize(const nsSize& aConstrainingSize,
const nsSize& aIntrinsicRatio,
FitType aFitType);
/**
* Compute the size of the rendered image (the concrete size) where no cover/
* contain constraints are given. The 'default algorithm' from the CSS Image
* Values spec.
*/
static nsSize ComputeConcreteSize(const mozilla::CSSSizeOrRatio& aSpecifiedSize,
const mozilla::CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize);
/**
* Set this image's preferred size. This will be its intrinsic size where
* specified and the default size where it is not. Used as the unscaled size
* when rendering the image.
*/
void SetPreferredSize(const mozilla::CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize);
/**
* Draws the image to the target rendering context using
* {background|mask}-specific arguments.
* @see nsLayoutUtils::DrawImage() for parameters.
*/
DrawResult DrawLayer(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsSize& aRepeatSize,
float aOpacity);
/**
* Draw the image to a single component of a border-image style rendering.
* aFill The destination rect to be drawn into
* aSrc is the part of the image to be rendered into a tile (aUnitSize in
* aFill), if aSrc and the dest tile are different sizes, the image will be
* scaled to map aSrc onto the dest tile.
* aHFill and aVFill are the repeat patterns for the component -
* NS_STYLE_BORDER_IMAGE_REPEAT_*
* aUnitSize The scaled size of a single source rect (in destination coords)
* aIndex identifies the component: 0 1 2
* 3 4 5
* 6 7 8
* aSVGViewportSize The image size evaluated by default sizing algorithm.
* Pass Nothing() if we can read a valid viewport size or aspect-ratio from
* the drawing image directly, otherwise, pass Some() with viewport size
* evaluated from default sizing algorithm.
* aHasIntrinsicRatio is used to record if the source image has fixed
* intrinsic ratio.
*/
DrawResult
DrawBorderImageComponent(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aFill,
const mozilla::CSSIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
uint8_t aIndex,
const mozilla::Maybe<nsSize>& aSVGViewportSize,
const bool aHasIntrinsicRatio);
bool IsRasterImage();
bool IsAnimatedImage();
/// Retrieves the image associated with this nsImageRenderer, if there is one.
already_AddRefed<imgIContainer> GetImage();
bool IsReady() const { return mPrepareResult == DrawResult::SUCCESS; }
DrawResult PrepareResult() const { return mPrepareResult; }
void SetExtendMode(mozilla::gfx::ExtendMode aMode) { mExtendMode = aMode; }
void SetMaskOp(uint8_t aMaskOp) { mMaskOp = aMaskOp; }
void PurgeCacheForViewportChange(const mozilla::Maybe<nsSize>& aSVGViewportSize,
const bool aHasRatio);
private:
/**
* Draws the image to the target rendering context.
* aSrc is a rect on the source image which will be mapped to aDest; it's
* currently only used for gradients.
*
* @see nsLayoutUtils::DrawImage() for other parameters.
*/
DrawResult Draw(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsSize& aRepeatSize,
const mozilla::CSSIntRect& aSrc,
float aOpacity = 1.0);
/**
* Helper method for creating a gfxDrawable from mPaintServerFrame or
* mImageElementSurface.
* Requires mType is eStyleImageType_Element.
* Returns null if we cannot create the drawable.
*/
already_AddRefed<gfxDrawable> DrawableForElement(const nsRect& aImageRect,
nsRenderingContext& aRenderingContext);
nsIFrame* mForFrame;
const nsStyleImage* mImage;
nsStyleImageType mType;
nsCOMPtr<imgIContainer> mImageContainer;
RefPtr<nsStyleGradient> mGradientData;
nsIFrame* mPaintServerFrame;
nsLayoutUtils::SurfaceFromElementResult mImageElementSurface;
DrawResult mPrepareResult;
nsSize mSize; // unscaled size of the image, in app units
uint32_t mFlags;
mozilla::gfx::ExtendMode mExtendMode;
uint8_t mMaskOp;
};
} // namespace mozilla
#endif /* nsImageRenderer_h__ */