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skia / skia / 260291fc75893a107c2c7bea9db25657ca25417e / . / src / pdf / SkPDFDevice.cpp
blob: 93ebe261cd4f3f96ab945188571234e41de65d8b [file] [log] [blame]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/pdf/SkPDFDevice.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkPath.h"
#include "include/core/SkPathEffect.h"
#include "include/core/SkPathUtils.h"
#include "include/core/SkRRect.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTextBlob.h"
#include "include/docs/SkPDFDocument.h"
#include "include/encode/SkJpegEncoder.h"
#include "include/pathops/SkPathOps.h"
#include "include/private/base/SkTemplates.h"
#include "include/private/base/SkTo.h"
#include "src/base/SkScopeExit.h"
#include "src/base/SkUTF.h"
#include "src/core/SkAdvancedTypefaceMetrics.h"
#include "src/core/SkAnnotationKeys.h"
#include "src/core/SkBitmapDevice.h"
#include "src/core/SkBlendModePriv.h"
#include "src/core/SkColorSpacePriv.h"
#include "src/core/SkDraw.h"
#include "src/core/SkFontPriv.h"
#include "src/core/SkImageFilterCache.h"
#include "src/core/SkImageFilter_Base.h"
#include "src/core/SkMaskFilterBase.h"
#include "src/core/SkRasterClip.h"
#include "src/core/SkStrike.h"
#include "src/core/SkStrikeSpec.h"
#include "src/core/SkTextFormatParams.h"
#include "src/pdf/SkBitmapKey.h"
#include "src/pdf/SkClusterator.h"
#include "src/pdf/SkPDFBitmap.h"
#include "src/pdf/SkPDFDocumentPriv.h"
#include "src/pdf/SkPDFFont.h"
#include "src/pdf/SkPDFFormXObject.h"
#include "src/pdf/SkPDFGraphicState.h"
#include "src/pdf/SkPDFResourceDict.h"
#include "src/pdf/SkPDFShader.h"
#include "src/pdf/SkPDFTypes.h"
#include "src/pdf/SkPDFUtils.h"
#include "src/shaders/SkColorShader.h"
#include "src/text/GlyphRun.h"
#include "src/utils/SkClipStackUtils.h"
#include <vector>
using namespace skia_private;
#ifndef SK_PDF_MASK_QUALITY
// If MASK_QUALITY is in [0,100], will be used for JpegEncoder.
// Otherwise, just encode masks losslessly.
#define SK_PDF_MASK_QUALITY 50
// Since these masks are used for blurry shadows, we shouldn't need
// high quality. Raise this value if your shadows have visible JPEG
// artifacts.
// If SkJpegEncoder::Encode fails, we will fall back to the lossless
// encoding.
#endif
namespace {
// If nodeId is not zero, outputs the tags to begin a marked-content sequence
// for the given node ID, and then closes those tags when this object goes
// out of scope.
class ScopedOutputMarkedContentTags {
public:
ScopedOutputMarkedContentTags(int nodeId, SkPoint point, SkPDFDocument* document,
SkDynamicMemoryWStream* out)
: fOut(out)
, fMark(nodeId ? document->createMarkIdForNodeId(nodeId, point) : SkPDFTagTree::Mark())
{
if (fMark) {
fOut->writeText("/P <</MCID ");
fOut->writeDecAsText(fMark.id());
fOut->writeText(" >>BDC\n");
}
}
explicit operator bool() const { return bool(fMark); }
SkPoint& point() { return SkASSERT(fMark), fMark.point(); }
~ScopedOutputMarkedContentTags() {
if (fMark) {
fOut->writeText("EMC\n");
}
}
private:
SkDynamicMemoryWStream* fOut;
SkPDFTagTree::Mark fMark;
};
} // namespace
// Utility functions
// This function destroys the mask and either frees or takes the pixels.
sk_sp<SkImage> mask_to_greyscale_image(SkMaskBuilder* mask) {
sk_sp<SkImage> img;
SkPixmap pm(SkImageInfo::Make(mask->fBounds.width(), mask->fBounds.height(),
kGray_8_SkColorType, kOpaque_SkAlphaType),
mask->fImage, mask->fRowBytes);
const int imgQuality = SK_PDF_MASK_QUALITY;
if (imgQuality <= 100 && imgQuality >= 0) {
SkDynamicMemoryWStream buffer;
SkJpegEncoder::Options jpegOptions;
jpegOptions.fQuality = imgQuality;
if (SkJpegEncoder::Encode(&buffer, pm, jpegOptions)) {
img = SkImages::DeferredFromEncodedData(buffer.detachAsData());
SkASSERT(img);
if (img) {
SkMaskBuilder::FreeImage(mask->image());
}
}
}
if (!img) {
img = SkImages::RasterFromPixmap(
pm, [](const void* p, void*) { SkMaskBuilder::FreeImage((void*)p); }, nullptr);
}
*mask = SkMaskBuilder(); // destructive;
return img;
}
sk_sp<SkImage> alpha_image_to_greyscale_image(const SkImage* mask) {
int w = mask->width(), h = mask->height();
SkBitmap greyBitmap;
greyBitmap.allocPixels(SkImageInfo::Make(w, h, kGray_8_SkColorType, kOpaque_SkAlphaType));
// TODO: support gpu images in pdf
if (!mask->readPixels(nullptr, SkImageInfo::MakeA8(w, h),
greyBitmap.getPixels(), greyBitmap.rowBytes(), 0, 0)) {
return nullptr;
}
greyBitmap.setImmutable();
return greyBitmap.asImage();
}
static int add_resource(THashSet<SkPDFIndirectReference>& resources, SkPDFIndirectReference ref) {
resources.add(ref);
return ref.fValue;
}
static void draw_points(SkCanvas::PointMode mode,
size_t count,
const SkPoint* points,
const SkPaint& paint,
const SkIRect& bounds,
SkDevice* device) {
SkRasterClip rc(bounds);
SkDraw draw;
draw.fDst = SkPixmap(SkImageInfo::MakeUnknown(bounds.right(), bounds.bottom()), nullptr, 0);
draw.fCTM = &device->localToDevice();
draw.fRC = &rc;
draw.drawPoints(mode, count, points, paint, device);
}
static void transform_shader(SkPaint* paint, const SkMatrix& ctm) {
SkASSERT(!ctm.isIdentity());
#if defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
// A shader's matrix is: CTM x LocalMatrix x WrappingLocalMatrix. We want to
// switch to device space, where CTM = I, while keeping the original behavior.
//
// I * LocalMatrix * NewWrappingMatrix = CTM * LocalMatrix
// LocalMatrix * NewWrappingMatrix = CTM * LocalMatrix
// InvLocalMatrix * LocalMatrix * NewWrappingMatrix = InvLocalMatrix * CTM * LocalMatrix
// NewWrappingMatrix = InvLocalMatrix * CTM * LocalMatrix
//
SkMatrix lm = SkPDFUtils::GetShaderLocalMatrix(paint->getShader());
SkMatrix lmInv;
if (lm.invert(&lmInv)) {
SkMatrix m = SkMatrix::Concat(SkMatrix::Concat(lmInv, ctm), lm);
paint->setShader(paint->getShader()->makeWithLocalMatrix(m));
}
return;
#endif
paint->setShader(paint->getShader()->makeWithLocalMatrix(ctm));
}
static SkTCopyOnFirstWrite<SkPaint> clean_paint(const SkPaint& srcPaint) {
SkTCopyOnFirstWrite<SkPaint> paint(srcPaint);
// If the paint will definitely draw opaquely, replace kSrc with
// kSrcOver. http://crbug.com/473572
if (!paint->isSrcOver() &&
SkBlendFastPath::kSrcOver == CheckFastPath(*paint, false))
{
paint.writable()->setBlendMode(SkBlendMode::kSrcOver);
}
if (paint->getColorFilter()) {
// We assume here that PDFs all draw in sRGB.
SkPaintPriv::RemoveColorFilter(paint.writable(), sk_srgb_singleton());
}
SkASSERT(!paint->getColorFilter());
return paint;
}
static void set_style(SkTCopyOnFirstWrite<SkPaint>* paint, SkPaint::Style style) {
if (paint->get()->getStyle() != style) {
paint->writable()->setStyle(style);
}
}
/* Calculate an inverted path's equivalent non-inverted path, given the
* canvas bounds.
* outPath may alias with invPath (since this is supported by PathOps).
*/
static bool calculate_inverse_path(const SkRect& bounds, const SkPath& invPath,
SkPath* outPath) {
SkASSERT(invPath.isInverseFillType());
return Op(SkPath::Rect(bounds), invPath, kIntersect_SkPathOp, outPath);
}
sk_sp<SkDevice> SkPDFDevice::createDevice(const CreateInfo& cinfo, const SkPaint* layerPaint) {
// PDF does not support image filters, so render them on CPU.
// Note that this rendering is done at "screen" resolution (100dpi), not
// printer resolution.
// TODO: It may be possible to express some filters natively using PDF
// to improve quality and file size (https://bug.skia.org/3043)
if (layerPaint && (layerPaint->getImageFilter() || layerPaint->getColorFilter())) {
// need to return a raster device, which we will detect in drawDevice()
return SkBitmapDevice::Create(cinfo.fInfo, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
}
return sk_make_sp<SkPDFDevice>(cinfo.fInfo.dimensions(), fDocument);
}
// A helper class to automatically finish a ContentEntry at the end of a
// drawing method and maintain the state needed between set up and finish.
class ScopedContentEntry {
public:
ScopedContentEntry(SkPDFDevice* device,
const SkClipStack* clipStack,
const SkMatrix& matrix,
const SkPaint& paint,
SkScalar textScale = 0)
: fDevice(device)
, fBlendMode(SkBlendMode::kSrcOver)
, fClipStack(clipStack)
{
if (matrix.hasPerspective()) {
NOT_IMPLEMENTED(!matrix.hasPerspective(), false);
return;
}
fBlendMode = paint.getBlendMode_or(SkBlendMode::kSrcOver);
fContentStream =
fDevice->setUpContentEntry(clipStack, matrix, paint, textScale, &fDstFormXObject);
}
ScopedContentEntry(SkPDFDevice* dev, const SkPaint& paint, SkScalar textScale = 0)
: ScopedContentEntry(dev, &dev->cs(), dev->localToDevice(), paint, textScale) {}
~ScopedContentEntry() {
if (fContentStream) {
SkPath* shape = &fShape;
if (shape->isEmpty()) {
shape = nullptr;
}
fDevice->finishContentEntry(fClipStack, fBlendMode, fDstFormXObject, shape);
}
}
explicit operator bool() const { return fContentStream != nullptr; }
SkDynamicMemoryWStream* stream() { return fContentStream; }
/* Returns true when we explicitly need the shape of the drawing. */
bool needShape() {
switch (fBlendMode) {
case SkBlendMode::kClear:
case SkBlendMode::kSrc:
case SkBlendMode::kSrcIn:
case SkBlendMode::kSrcOut:
case SkBlendMode::kDstIn:
case SkBlendMode::kDstOut:
case SkBlendMode::kSrcATop:
case SkBlendMode::kDstATop:
case SkBlendMode::kModulate:
return true;
default:
return false;
}
}
/* Returns true unless we only need the shape of the drawing. */
bool needSource() {
if (fBlendMode == SkBlendMode::kClear) {
return false;
}
return true;
}
/* If the shape is different than the alpha component of the content, then
* setShape should be called with the shape. In particular, images and
* devices have rectangular shape.
*/
void setShape(const SkPath& shape) {
fShape = shape;
}
private:
SkPDFDevice* fDevice = nullptr;
SkDynamicMemoryWStream* fContentStream = nullptr;
SkBlendMode fBlendMode;
SkPDFIndirectReference fDstFormXObject;
SkPath fShape;
const SkClipStack* fClipStack;
};
////////////////////////////////////////////////////////////////////////////////
SkPDFDevice::SkPDFDevice(SkISize pageSize, SkPDFDocument* doc, const SkMatrix& transform)
: SkClipStackDevice(SkImageInfo::MakeUnknown(pageSize.width(), pageSize.height()),
SkSurfaceProps(0, kUnknown_SkPixelGeometry))
, fInitialTransform(transform)
, fNodeId(0)
, fDocument(doc)
{
SkASSERT(!pageSize.isEmpty());
}
SkPDFDevice::~SkPDFDevice() = default;
void SkPDFDevice::reset() {
fGraphicStateResources.reset();
fXObjectResources.reset();
fShaderResources.reset();
fFontResources.reset();
fContent.reset();
fActiveStackState = SkPDFGraphicStackState();
}
void SkPDFDevice::drawAnnotation(const SkRect& rect, const char key[], SkData* value) {
if (!value) {
return;
}
// Annotations are specified in absolute coordinates, so the page xform maps from device space
// to the global space, and applies the document transform.
SkMatrix pageXform = this->deviceToGlobal().asM33();
pageXform.postConcat(fDocument->currentPageTransform());
if (rect.isEmpty()) {
if (!strcmp(key, SkPDFGetNodeIdKey())) {
int nodeID;
if (value->size() != sizeof(nodeID)) { return; }
memcpy(&nodeID, value->data(), sizeof(nodeID));
fNodeId = nodeID;
return;
}
if (!strcmp(SkAnnotationKeys::Define_Named_Dest_Key(), key)) {
SkPoint p = this->localToDevice().mapXY(rect.x(), rect.y());
pageXform.mapPoints(&p, 1);
auto pg = fDocument->currentPage();
fDocument->fNamedDestinations.push_back(SkPDFNamedDestination{sk_ref_sp(value), p, pg});
}
return;
}
// Convert to path to handle non-90-degree rotations.
SkPath path = SkPath::Rect(rect).makeTransform(this->localToDevice());
SkPath clip;
SkClipStack_AsPath(this->cs(), &clip);
Op(clip, path, kIntersect_SkPathOp, &path);
// PDF wants a rectangle only.
SkRect transformedRect = pageXform.mapRect(path.getBounds());
if (transformedRect.isEmpty()) {
return;
}
SkPDFLink::Type linkType = SkPDFLink::Type::kNone;
if (!strcmp(SkAnnotationKeys::URL_Key(), key)) {
linkType = SkPDFLink::Type::kUrl;
} else if (!strcmp(SkAnnotationKeys::Link_Named_Dest_Key(), key)) {
linkType = SkPDFLink::Type::kNamedDestination;
}
if (linkType != SkPDFLink::Type::kNone) {
std::unique_ptr<SkPDFLink> link = std::make_unique<SkPDFLink>(
linkType, value, transformedRect, fNodeId);
fDocument->fCurrentPageLinks.push_back(std::move(link));
}
}
void SkPDFDevice::drawPaint(const SkPaint& srcPaint) {
SkMatrix inverse;
if (!this->localToDevice().invert(&inverse)) {
return;
}
SkRect bbox = this->cs().bounds(this->bounds());
inverse.mapRect(&bbox);
bbox.roundOut(&bbox);
if (this->hasEmptyClip()) {
return;
}
SkPaint newPaint = srcPaint;
newPaint.setStyle(SkPaint::kFill_Style);
this->drawRect(bbox, newPaint);
}
void SkPDFDevice::drawPoints(SkCanvas::PointMode mode,
size_t count,
const SkPoint* points,
const SkPaint& srcPaint) {
if (this->hasEmptyClip()) {
return;
}
if (count == 0) {
return;
}
SkTCopyOnFirstWrite<SkPaint> paint(clean_paint(srcPaint));
if (SkCanvas::kPoints_PointMode != mode) {
set_style(&paint, SkPaint::kStroke_Style);
}
// SkDraw::drawPoints converts to multiple calls to fDevice->drawPath.
// We only use this when there's a path effect or perspective because of the overhead
// of multiple calls to setUpContentEntry it causes.
if (paint->getPathEffect() || this->localToDevice().hasPerspective()) {
draw_points(mode, count, points, *paint, this->devClipBounds(), this);
return;
}
if (mode == SkCanvas::kPoints_PointMode && paint->getStrokeCap() != SkPaint::kRound_Cap) {
if (paint->getStrokeWidth()) {
// PDF won't draw a single point with square/butt caps because the
// orientation is ambiguous. Draw a rectangle instead.
set_style(&paint, SkPaint::kFill_Style);
SkScalar strokeWidth = paint->getStrokeWidth();
SkScalar halfStroke = SkScalarHalf(strokeWidth);
for (size_t i = 0; i < count; i++) {
SkRect r = SkRect::MakeXYWH(points[i].fX, points[i].fY, 0, 0);
r.inset(-halfStroke, -halfStroke);
this->drawRect(r, *paint);
}
return;
} else {
if (paint->getStrokeCap() != SkPaint::kRound_Cap) {
paint.writable()->setStrokeCap(SkPaint::kRound_Cap);
}
}
}
ScopedContentEntry content(this, *paint);
if (!content) {
return;
}
SkDynamicMemoryWStream* contentStream = content.stream();
switch (mode) {
case SkCanvas::kPolygon_PointMode:
SkPDFUtils::MoveTo(points[0].fX, points[0].fY, contentStream);
for (size_t i = 1; i < count; i++) {
SkPDFUtils::AppendLine(points[i].fX, points[i].fY, contentStream);
}
SkPDFUtils::StrokePath(contentStream);
break;
case SkCanvas::kLines_PointMode:
for (size_t i = 0; i < count/2; i++) {
SkPDFUtils::MoveTo(points[i * 2].fX, points[i * 2].fY, contentStream);
SkPDFUtils::AppendLine(points[i * 2 + 1].fX, points[i * 2 + 1].fY, contentStream);
SkPDFUtils::StrokePath(contentStream);
}
break;
case SkCanvas::kPoints_PointMode:
SkASSERT(paint->getStrokeCap() == SkPaint::kRound_Cap);
for (size_t i = 0; i < count; i++) {
SkPDFUtils::MoveTo(points[i].fX, points[i].fY, contentStream);
SkPDFUtils::ClosePath(contentStream);
SkPDFUtils::StrokePath(contentStream);
}
break;
default:
SkASSERT(false);
}
}
void SkPDFDevice::drawRect(const SkRect& rect, const SkPaint& paint) {
SkRect r = rect;
r.sort();
this->internalDrawPath(this->cs(), this->localToDevice(), SkPath::Rect(r), paint, true);
}
void SkPDFDevice::drawRRect(const SkRRect& rrect, const SkPaint& paint) {
this->internalDrawPath(this->cs(), this->localToDevice(), SkPath::RRect(rrect), paint, true);
}
void SkPDFDevice::drawOval(const SkRect& oval, const SkPaint& paint) {
this->internalDrawPath(this->cs(), this->localToDevice(), SkPath::Oval(oval), paint, true);
}
void SkPDFDevice::drawPath(const SkPath& path, const SkPaint& paint, bool pathIsMutable) {
this->internalDrawPath(this->cs(), this->localToDevice(), path, paint, pathIsMutable);
}
void SkPDFDevice::internalDrawPathWithFilter(const SkClipStack& clipStack,
const SkMatrix& ctm,
const SkPath& origPath,
const SkPaint& origPaint) {
SkASSERT(origPaint.getMaskFilter());
SkPath path(origPath);
SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
SkStrokeRec::InitStyle initStyle = skpathutils::FillPathWithPaint(path, *paint, &path)
? SkStrokeRec::kFill_InitStyle
: SkStrokeRec::kHairline_InitStyle;
path.transform(ctm, &path);
SkIRect bounds = clipStack.bounds(this->bounds()).roundOut();
SkMaskBuilder sourceMask;
if (!SkDraw::DrawToMask(path, bounds, paint->getMaskFilter(), &SkMatrix::I(),
&sourceMask, SkMaskBuilder::kComputeBoundsAndRenderImage_CreateMode,
initStyle)) {
return;
}
SkAutoMaskFreeImage srcAutoMaskFreeImage(sourceMask.image());
SkMaskBuilder dstMask;
SkIPoint margin;
if (!as_MFB(paint->getMaskFilter())->filterMask(&dstMask, sourceMask, ctm, &margin)) {
return;
}
SkIRect dstMaskBounds = dstMask.fBounds;
sk_sp<SkImage> mask = mask_to_greyscale_image(&dstMask);
// PDF doesn't seem to allow masking vector graphics with an Image XObject.
// Must mask with a Form XObject.
sk_sp<SkPDFDevice> maskDevice = this->makeCongruentDevice();
{
SkCanvas canvas(maskDevice);
canvas.drawImage(mask, dstMaskBounds.x(), dstMaskBounds.y());
}
if (!ctm.isIdentity() && paint->getShader()) {
transform_shader(paint.writable(), ctm); // Since we are using identity matrix.
}
ScopedContentEntry content(this, &clipStack, SkMatrix::I(), *paint);
if (!content) {
return;
}
this->setGraphicState(SkPDFGraphicState::GetSMaskGraphicState(
maskDevice->makeFormXObjectFromDevice(dstMaskBounds, true), false,
SkPDFGraphicState::kLuminosity_SMaskMode, fDocument), content.stream());
SkPDFUtils::AppendRectangle(SkRect::Make(dstMaskBounds), content.stream());
SkPDFUtils::PaintPath(SkPaint::kFill_Style, path.getFillType(), content.stream());
this->clearMaskOnGraphicState(content.stream());
}
void SkPDFDevice::setGraphicState(SkPDFIndirectReference gs, SkDynamicMemoryWStream* content) {
SkPDFUtils::ApplyGraphicState(add_resource(fGraphicStateResources, gs), content);
}
void SkPDFDevice::clearMaskOnGraphicState(SkDynamicMemoryWStream* contentStream) {
// The no-softmask graphic state is used to "turn off" the mask for later draw calls.
SkPDFIndirectReference& noSMaskGS = fDocument->fNoSmaskGraphicState;
if (!noSMaskGS) {
SkPDFDict tmp("ExtGState");
tmp.insertName("SMask", "None");
noSMaskGS = fDocument->emit(tmp);
}
this->setGraphicState(noSMaskGS, contentStream);
}
void SkPDFDevice::internalDrawPath(const SkClipStack& clipStack,
const SkMatrix& ctm,
const SkPath& origPath,
const SkPaint& srcPaint,
bool pathIsMutable) {
if (clipStack.isEmpty(this->bounds())) {
return;
}
SkTCopyOnFirstWrite<SkPaint> paint(clean_paint(srcPaint));
SkPath modifiedPath;
SkPath* pathPtr = const_cast<SkPath*>(&origPath);
if (paint->getMaskFilter()) {
this->internalDrawPathWithFilter(clipStack, ctm, origPath, *paint);
return;
}
SkMatrix matrix = ctm;
if (paint->getPathEffect()) {
if (clipStack.isEmpty(this->bounds())) {
return;
}
if (!pathIsMutable) {
modifiedPath = origPath;
pathPtr = &modifiedPath;
pathIsMutable = true;
}
if (skpathutils::FillPathWithPaint(*pathPtr, *paint, pathPtr)) {
set_style(&paint, SkPaint::kFill_Style);
} else {
set_style(&paint, SkPaint::kStroke_Style);
if (paint->getStrokeWidth() != 0) {
paint.writable()->setStrokeWidth(0);
}
}
paint.writable()->setPathEffect(nullptr);
}
if (this->handleInversePath(*pathPtr, *paint, pathIsMutable)) {
return;
}
if (matrix.getType() & SkMatrix::kPerspective_Mask) {
if (!pathIsMutable) {
modifiedPath = origPath;
pathPtr = &modifiedPath;
pathIsMutable = true;
}
pathPtr->transform(matrix);
if (paint->getShader()) {
transform_shader(paint.writable(), matrix);
}
matrix = SkMatrix::I();
}
ScopedContentEntry content(this, &clipStack, matrix, *paint);
if (!content) {
return;
}
constexpr SkScalar kToleranceScale = 0.0625f; // smaller = better conics (circles).
SkScalar matrixScale = matrix.mapRadius(1.0f);
SkScalar tolerance = matrixScale > 0.0f ? kToleranceScale / matrixScale : kToleranceScale;
bool consumeDegeratePathSegments =
paint->getStyle() == SkPaint::kFill_Style ||
(paint->getStrokeCap() != SkPaint::kRound_Cap &&
paint->getStrokeCap() != SkPaint::kSquare_Cap);
SkPDFUtils::EmitPath(*pathPtr, paint->getStyle(), consumeDegeratePathSegments, content.stream(),
tolerance);
SkPDFUtils::PaintPath(paint->getStyle(), pathPtr->getFillType(), content.stream());
}
////////////////////////////////////////////////////////////////////////////////
void SkPDFDevice::drawImageRect(const SkImage* image,
const SkRect* src,
const SkRect& dst,
const SkSamplingOptions& sampling,
const SkPaint& paint,
SkCanvas::SrcRectConstraint) {
SkASSERT(image);
this->internalDrawImageRect(SkKeyedImage(sk_ref_sp(const_cast<SkImage*>(image))),
src, dst, sampling, paint, this->localToDevice());
}
void SkPDFDevice::drawSprite(const SkBitmap& bm, int x, int y, const SkPaint& paint) {
SkASSERT(!bm.drawsNothing());
auto r = SkRect::MakeXYWH(x, y, bm.width(), bm.height());
this->internalDrawImageRect(SkKeyedImage(bm), nullptr, r, SkSamplingOptions(), paint,
SkMatrix::I());
}
////////////////////////////////////////////////////////////////////////////////
namespace {
class GlyphPositioner {
public:
GlyphPositioner(SkDynamicMemoryWStream* content,
SkScalar textSkewX,
SkPoint origin)
: fContent(content)
, fCurrentMatrixOrigin(origin)
, fTextSkewX(textSkewX) {
}
~GlyphPositioner() { this->flush(); }
void flush() {
if (fInText) {
fContent->writeText("> Tj\n");
fInText = false;
}
}
void setFont(SkPDFFont* pdfFont) {
this->flush();
fPDFFont = pdfFont;
// Reader 2020.013.20064 incorrectly advances some Type3 fonts https://crbug.com/1226960
bool convertedToType3 = fPDFFont->getType() == SkAdvancedTypefaceMetrics::kOther_Font;
bool thousandEM = fPDFFont->typeface()->getUnitsPerEm() == 1000;
fViewersAgreeOnAdvancesInFont = thousandEM || !convertedToType3;
}
void writeGlyph(uint16_t glyph, SkScalar advanceWidth, SkPoint xy) {
SkASSERT(fPDFFont);
if (!fInitialized) {
// Flip the text about the x-axis to account for origin swap and include
// the passed parameters.
fContent->writeText("1 0 ");
SkPDFUtils::AppendScalar(-fTextSkewX, fContent);
fContent->writeText(" -1 ");
SkPDFUtils::AppendScalar(fCurrentMatrixOrigin.x(), fContent);
fContent->writeText(" ");
SkPDFUtils::AppendScalar(fCurrentMatrixOrigin.y(), fContent);
fContent->writeText(" Tm\n");
fCurrentMatrixOrigin.set(0.0f, 0.0f);
fInitialized = true;
}
SkPoint position = xy - fCurrentMatrixOrigin;
if (!fViewersAgreeOnXAdvance || position != SkPoint{fXAdvance, 0}) {
this->flush();
SkPDFUtils::AppendScalar(position.x() - position.y() * fTextSkewX, fContent);
fContent->writeText(" ");
SkPDFUtils::AppendScalar(-position.y(), fContent);
fContent->writeText(" Td ");
fCurrentMatrixOrigin = xy;
fXAdvance = 0;
fViewersAgreeOnXAdvance = true;
}
fXAdvance += advanceWidth;
if (!fViewersAgreeOnAdvancesInFont) {
fViewersAgreeOnXAdvance = false;
}
if (!fInText) {
fContent->writeText("<");
fInText = true;
}
if (fPDFFont->multiByteGlyphs()) {
SkPDFUtils::WriteUInt16BE(fContent, glyph);
} else {
SkASSERT(0 == glyph >> 8);
SkPDFUtils::WriteUInt8(fContent, static_cast<uint8_t>(glyph));
}
}
private:
SkDynamicMemoryWStream* fContent;
SkPDFFont* fPDFFont = nullptr;
SkPoint fCurrentMatrixOrigin;
SkScalar fXAdvance = 0.0f;
bool fViewersAgreeOnAdvancesInFont = true;
bool fViewersAgreeOnXAdvance = true;
SkScalar fTextSkewX;
bool fInText = false;
bool fInitialized = false;
};
} // namespace
static SkUnichar map_glyph(const std::vector<SkUnichar>& glyphToUnicode, SkGlyphID glyph) {
return glyph < glyphToUnicode.size() ? glyphToUnicode[SkToInt(glyph)] : -1;
}
namespace {
struct PositionedGlyph {
SkPoint fPos;
SkGlyphID fGlyph;
};
} // namespace
static SkRect get_glyph_bounds_device_space(const SkGlyph* glyph,
SkScalar xScale, SkScalar yScale,
SkPoint xy, const SkMatrix& ctm) {
SkRect glyphBounds = SkMatrix::Scale(xScale, yScale).mapRect(glyph->rect());
glyphBounds.offset(xy);
ctm.mapRect(&glyphBounds); // now in dev space.
return glyphBounds;
}
static bool contains(const SkRect& r, SkPoint p) {
return r.left() <= p.x() && p.x() <= r.right() &&
r.top() <= p.y() && p.y() <= r.bottom();
}
void SkPDFDevice::drawGlyphRunAsPath(
const sktext::GlyphRun& glyphRun, SkPoint offset, const SkPaint& runPaint) {
const SkFont& font = glyphRun.font();
SkPath path;
struct Rec {
SkPath* fPath;
SkPoint fOffset;
const SkPoint* fPos;
} rec = {&path, offset, glyphRun.positions().data()};
font.getPaths(glyphRun.glyphsIDs().data(), glyphRun.glyphsIDs().size(),
[](const SkPath* path, const SkMatrix& mx, void* ctx) {
Rec* rec = reinterpret_cast<Rec*>(ctx);
if (path) {
SkMatrix total = mx;
total.postTranslate(rec->fPos->fX + rec->fOffset.fX,
rec->fPos->fY + rec->fOffset.fY);
rec->fPath->addPath(*path, total);
}
rec->fPos += 1; // move to the next glyph's position
}, &rec);
this->internalDrawPath(this->cs(), this->localToDevice(), path, runPaint, true);
SkFont transparentFont = glyphRun.font();
transparentFont.setEmbolden(false); // Stop Recursion
sktext::GlyphRun tmpGlyphRun(glyphRun, transparentFont);
SkPaint transparent;
transparent.setColor(SK_ColorTRANSPARENT);
if (this->localToDevice().hasPerspective()) {
SkAutoDeviceTransformRestore adr(this, SkMatrix::I());
this->internalDrawGlyphRun(tmpGlyphRun, offset, transparent);
} else {
this->internalDrawGlyphRun(tmpGlyphRun, offset, transparent);
}
}
static bool needs_new_font(SkPDFFont* font, const SkGlyph* glyph,
SkAdvancedTypefaceMetrics::FontType fontType) {
if (!font || !font->hasGlyph(glyph->getGlyphID())) {
return true;
}
if (fontType == SkAdvancedTypefaceMetrics::kOther_Font) {
return false;
}
if (glyph->isEmpty()) {
return false;
}
bool bitmapOnly = nullptr == glyph->path();
bool convertedToType3 = (font->getType() == SkAdvancedTypefaceMetrics::kOther_Font);
return convertedToType3 != bitmapOnly;
}
void SkPDFDevice::internalDrawGlyphRun(
const sktext::GlyphRun& glyphRun, SkPoint offset, const SkPaint& runPaint) {
const SkGlyphID* glyphIDs = glyphRun.glyphsIDs().data();
uint32_t glyphCount = SkToU32(glyphRun.glyphsIDs().size());
const SkFont& glyphRunFont = glyphRun.font();
if (!glyphCount || !glyphIDs || glyphRunFont.getSize() <= 0 || this->hasEmptyClip()) {
return;
}
if (runPaint.getPathEffect()
|| runPaint.getMaskFilter()
|| glyphRunFont.isEmbolden()
|| this->localToDevice().hasPerspective()
|| SkPaint::kFill_Style != runPaint.getStyle()) {
// Stroked Text doesn't work well with Type3 fonts.
this->drawGlyphRunAsPath(glyphRun, offset, runPaint);
return;
}
SkTypeface* typeface = SkFontPriv::GetTypefaceOrDefault(glyphRunFont);
if (!typeface) {
SkDebugf("SkPDF: SkTypeface::MakeDefault() returned nullptr.\n");
return;
}
const SkAdvancedTypefaceMetrics* metrics = SkPDFFont::GetMetrics(typeface, fDocument);
if (!metrics) {
return;
}
SkAdvancedTypefaceMetrics::FontType fontType = SkPDFFont::FontType(*typeface, *metrics);
const std::vector<SkUnichar>& glyphToUnicode = SkPDFFont::GetUnicodeMap(typeface, fDocument);
SkClusterator clusterator(glyphRun);
int emSize;
SkStrikeSpec strikeSpec = SkStrikeSpec::MakePDFVector(*typeface, &emSize);
SkScalar textSize = glyphRunFont.getSize();
SkScalar advanceScale = textSize * glyphRunFont.getScaleX() / emSize;
// textScaleX and textScaleY are used to get a conservative bounding box for glyphs.
SkScalar textScaleY = textSize / emSize;
SkScalar textScaleX = advanceScale + glyphRunFont.getSkewX() * textScaleY;
SkRect clipStackBounds = this->cs().bounds(this->bounds());
SkTCopyOnFirstWrite<SkPaint> paint(clean_paint(runPaint));
ScopedContentEntry content(this, *paint, glyphRunFont.getScaleX());
if (!content) {
return;
}
SkDynamicMemoryWStream* out = content.stream();
out->writeText("BT\n");
SK_AT_SCOPE_EXIT(out->writeText("ET\n"));
// Destinations are in absolute coordinates.
// The glyphs bounds go through the localToDevice separately for clipping.
SkMatrix pageXform = this->deviceToGlobal().asM33();
pageXform.postConcat(fDocument->currentPageTransform());
ScopedOutputMarkedContentTags mark(fNodeId, {SK_ScalarNaN, SK_ScalarNaN}, fDocument, out);
if (!glyphRun.text().empty()) {
fDocument->addNodeTitle(fNodeId, glyphRun.text());
}
const int numGlyphs = typeface->countGlyphs();
if (clusterator.reversedChars()) {
out->writeText("/ReversedChars BMC\n");
}
SK_AT_SCOPE_EXIT(if (clusterator.reversedChars()) { out->writeText("EMC\n"); } );
GlyphPositioner glyphPositioner(out, glyphRunFont.getSkewX(), offset);
SkPDFFont* font = nullptr;
SkBulkGlyphMetricsAndPaths paths{strikeSpec};
auto glyphs = paths.glyphs(glyphRun.glyphsIDs());
while (SkClusterator::Cluster c = clusterator.next()) {
int index = c.fGlyphIndex;
int glyphLimit = index + c.fGlyphCount;
bool actualText = false;
SK_AT_SCOPE_EXIT(if (actualText) {
glyphPositioner.flush();
out->writeText("EMC\n");
});
if (c.fUtf8Text) { // real cluster
// Check if `/ActualText` needed.
const char* textPtr = c.fUtf8Text;
const char* textEnd = c.fUtf8Text + c.fTextByteLength;
SkUnichar unichar = SkUTF::NextUTF8(&textPtr, textEnd);
if (unichar < 0) {
return;
}
if (textPtr < textEnd || // >1 code points in cluster
c.fGlyphCount > 1 || // >1 glyphs in cluster
unichar != map_glyph(glyphToUnicode, glyphIDs[index])) // 1:1 but wrong mapping
{
glyphPositioner.flush();
out->writeText("/Span<</ActualText ");
SkPDFWriteTextString(out, c.fUtf8Text, c.fTextByteLength);
out->writeText(" >> BDC\n"); // begin marked-content sequence
// with an associated property list.
actualText = true;
}
}
for (; index < glyphLimit; ++index) {
SkGlyphID gid = glyphIDs[index];
if (numGlyphs <= gid) {
continue;
}
SkPoint xy = glyphRun.positions()[index];
// Do a glyph-by-glyph bounds-reject if positions are absolute.
SkRect glyphBounds = get_glyph_bounds_device_space(
glyphs[index], textScaleX, textScaleY,
xy + offset, this->localToDevice());
if (glyphBounds.isEmpty()) {
if (!contains(clipStackBounds, {glyphBounds.x(), glyphBounds.y()})) {
continue;
}
} else {
if (!clipStackBounds.intersects(glyphBounds)) {
continue; // reject glyphs as out of bounds
}
}
if (needs_new_font(font, glyphs[index], fontType)) {
// Not yet specified font or need to switch font.
font = SkPDFFont::GetFontResource(fDocument, glyphs[index], typeface);
SkASSERT(font); // All preconditions for SkPDFFont::GetFontResource are met.
glyphPositioner.setFont(font);
SkPDFWriteResourceName(out, SkPDFResourceType::kFont,
add_resource(fFontResources, font->indirectReference()));
out->writeText(" ");
SkPDFUtils::AppendScalar(textSize, out);
out->writeText(" Tf\n");
}
font->noteGlyphUsage(gid);
SkGlyphID encodedGlyph = font->glyphToPDFFontEncoding(gid);
SkScalar advance = advanceScale * glyphs[index]->advanceX();
if (mark) {
SkRect absoluteGlyphBounds = pageXform.mapRect(glyphBounds);
SkPoint& markPoint = mark.point();
if (markPoint.isFinite()) {
markPoint.fX = std::min(absoluteGlyphBounds.fLeft , markPoint.fX);
markPoint.fY = std::max(absoluteGlyphBounds.fBottom, markPoint.fY); // PDF top
} else {
markPoint = SkPoint{absoluteGlyphBounds.fLeft, absoluteGlyphBounds.fBottom};
}
}
glyphPositioner.writeGlyph(encodedGlyph, advance, xy);
}
}
}
void SkPDFDevice::onDrawGlyphRunList(SkCanvas*,
const sktext::GlyphRunList& glyphRunList,
const SkPaint& initialPaint,
const SkPaint& drawingPaint) {
SkASSERT(!glyphRunList.hasRSXForm());
for (const sktext::GlyphRun& glyphRun : glyphRunList) {
this->internalDrawGlyphRun(glyphRun, glyphRunList.origin(), drawingPaint);
}
}
void SkPDFDevice::drawVertices(const SkVertices*, sk_sp<SkBlender>, const SkPaint&, bool) {
if (this->hasEmptyClip()) {
return;
}
// TODO: implement drawVertices
}
void SkPDFDevice::drawMesh(const SkMesh&, sk_sp<SkBlender>, const SkPaint&) {
if (this->hasEmptyClip()) {
return;
}
// TODO: implement drawMesh
}
void SkPDFDevice::drawFormXObject(SkPDFIndirectReference xObject, SkDynamicMemoryWStream* content,
SkPath* shape) {
SkPoint point{SK_ScalarNaN, SK_ScalarNaN};
if (shape) {
// Destinations are in absolute coordinates.
SkMatrix pageXform = this->deviceToGlobal().asM33();
pageXform.postConcat(fDocument->currentPageTransform());
// The shape already has localToDevice applied.
SkRect shapeBounds = shape->getBounds();
pageXform.mapRect(&shapeBounds);
point = SkPoint{shapeBounds.fLeft, shapeBounds.fBottom};
}
ScopedOutputMarkedContentTags mark(fNodeId, point, fDocument, content);
SkASSERT(xObject);
SkPDFWriteResourceName(content, SkPDFResourceType::kXObject,
add_resource(fXObjectResources, xObject));
content->writeText(" Do\n");
}
sk_sp<SkSurface> SkPDFDevice::makeSurface(const SkImageInfo& info, const SkSurfaceProps& props) {
return SkSurfaces::Raster(info, &props);
}
static std::vector<SkPDFIndirectReference> sort(const THashSet<SkPDFIndirectReference>& src) {
std::vector<SkPDFIndirectReference> dst;
dst.reserve(src.count());
for (SkPDFIndirectReference ref : src) {
dst.push_back(ref);
}
std::sort(dst.begin(), dst.end(),
[](SkPDFIndirectReference a, SkPDFIndirectReference b) { return a.fValue < b.fValue; });
return dst;
}
std::unique_ptr<SkPDFDict> SkPDFDevice::makeResourceDict() {
return SkPDFMakeResourceDict(sort(fGraphicStateResources),
sort(fShaderResources),
sort(fXObjectResources),
sort(fFontResources));
}
std::unique_ptr<SkStreamAsset> SkPDFDevice::content() {
if (fActiveStackState.fContentStream) {
fActiveStackState.drainStack();
fActiveStackState = SkPDFGraphicStackState();
}
if (fContent.bytesWritten() == 0) {
return std::make_unique<SkMemoryStream>();
}
SkDynamicMemoryWStream buffer;
if (fInitialTransform.getType() != SkMatrix::kIdentity_Mask) {
SkPDFUtils::AppendTransform(fInitialTransform, &buffer);
}
if (fNeedsExtraSave) {
buffer.writeText("q\n");
}
fContent.writeToAndReset(&buffer);
if (fNeedsExtraSave) {
buffer.writeText("Q\n");
}
fNeedsExtraSave = false;
return std::unique_ptr<SkStreamAsset>(buffer.detachAsStream());
}
/* Draws an inverse filled path by using Path Ops to compute the positive
* inverse using the current clip as the inverse bounds.
* Return true if this was an inverse path and was properly handled,
* otherwise returns false and the normal drawing routine should continue,
* either as a (incorrect) fallback or because the path was not inverse
* in the first place.
*/
bool SkPDFDevice::handleInversePath(const SkPath& origPath,
const SkPaint& paint,
bool pathIsMutable) {
if (!origPath.isInverseFillType()) {
return false;
}
if (this->hasEmptyClip()) {
return false;
}
SkPath modifiedPath;
SkPath* pathPtr = const_cast<SkPath*>(&origPath);
SkPaint noInversePaint(paint);
// Merge stroking operations into final path.
if (SkPaint::kStroke_Style == paint.getStyle() ||
SkPaint::kStrokeAndFill_Style == paint.getStyle()) {
bool doFillPath = skpathutils::FillPathWithPaint(origPath, paint, &modifiedPath);
if (doFillPath) {
noInversePaint.setStyle(SkPaint::kFill_Style);
noInversePaint.setStrokeWidth(0);
pathPtr = &modifiedPath;
} else {
// To be consistent with the raster output, hairline strokes
// are rendered as non-inverted.
modifiedPath.toggleInverseFillType();
this->internalDrawPath(this->cs(), this->localToDevice(), modifiedPath, paint, true);
return true;
}
}
// Get bounds of clip in current transform space
// (clip bounds are given in device space).
SkMatrix transformInverse;
SkMatrix totalMatrix = this->localToDevice();
if (!totalMatrix.invert(&transformInverse)) {
return false;
}
SkRect bounds = this->cs().bounds(this->bounds());
transformInverse.mapRect(&bounds);
// Extend the bounds by the line width (plus some padding)
// so the edge doesn't cause a visible stroke.
bounds.outset(paint.getStrokeWidth() + SK_Scalar1,
paint.getStrokeWidth() + SK_Scalar1);
if (!calculate_inverse_path(bounds, *pathPtr, &modifiedPath)) {
return false;
}
this->internalDrawPath(this->cs(), this->localToDevice(), modifiedPath, noInversePaint, true);
return true;
}
SkPDFIndirectReference SkPDFDevice::makeFormXObjectFromDevice(SkIRect bounds, bool alpha) {
SkMatrix inverseTransform = SkMatrix::I();
if (!fInitialTransform.isIdentity()) {
if (!fInitialTransform.invert(&inverseTransform)) {
SkDEBUGFAIL("Layer initial transform should be invertible.");
inverseTransform.reset();
}
}
const char* colorSpace = alpha ? "DeviceGray" : nullptr;
SkPDFIndirectReference xobject =
SkPDFMakeFormXObject(fDocument, this->content(),
SkPDFMakeArray(bounds.left(), bounds.top(),
bounds.right(), bounds.bottom()),
this->makeResourceDict(), inverseTransform, colorSpace);
// We always draw the form xobjects that we create back into the device, so
// we simply preserve the font usage instead of pulling it out and merging
// it back in later.
this->reset();
return xobject;
}
SkPDFIndirectReference SkPDFDevice::makeFormXObjectFromDevice(bool alpha) {
return this->makeFormXObjectFromDevice(SkIRect{0, 0, this->width(), this->height()}, alpha);
}
void SkPDFDevice::drawFormXObjectWithMask(SkPDFIndirectReference xObject,
SkPDFIndirectReference sMask,
SkBlendMode mode,
bool invertClip) {
SkASSERT(sMask);
SkPaint paint;
paint.setBlendMode(mode);
ScopedContentEntry content(this, nullptr, SkMatrix::I(), paint);
if (!content) {
return;
}
this->setGraphicState(SkPDFGraphicState::GetSMaskGraphicState(
sMask, invertClip, SkPDFGraphicState::kAlpha_SMaskMode,
fDocument), content.stream());
this->drawFormXObject(xObject, content.stream(), nullptr);
this->clearMaskOnGraphicState(content.stream());
}
static bool treat_as_regular_pdf_blend_mode(SkBlendMode blendMode) {
return nullptr != SkPDFUtils::BlendModeName(blendMode);
}
static void populate_graphic_state_entry_from_paint(
SkPDFDocument* doc,
const SkMatrix& matrix,
const SkClipStack* clipStack,
SkIRect deviceBounds,
const SkPaint& paint,
const SkMatrix& initialTransform,
SkScalar textScale,
SkPDFGraphicStackState::Entry* entry,
THashSet<SkPDFIndirectReference>* shaderResources,
THashSet<SkPDFIndirectReference>* graphicStateResources) {
NOT_IMPLEMENTED(paint.getPathEffect() != nullptr, false);
NOT_IMPLEMENTED(paint.getMaskFilter() != nullptr, false);
NOT_IMPLEMENTED(paint.getColorFilter() != nullptr, false);
entry->fMatrix = matrix;
entry->fClipStackGenID = clipStack ? clipStack->getTopmostGenID()
: SkClipStack::kWideOpenGenID;
SkColor4f color = paint.getColor4f();
entry->fColor = {color.fR, color.fG, color.fB, 1};
entry->fShaderIndex = -1;
// PDF treats a shader as a color, so we only set one or the other.
SkShader* shader = paint.getShader();
if (shader) {
// note: we always present the alpha as 1 for the shader, knowing that it will be
// accounted for when we create our newGraphicsState (below)
if (as_SB(shader)->type() == SkShaderBase::ShaderType::kColor) {
auto colorShader = static_cast<SkColorShader*>(shader);
// We don't have to set a shader just for a color.
color = SkColor4f::FromColor(colorShader->color());
entry->fColor = {color.fR, color.fG, color.fB, 1};
} else {
// PDF positions patterns relative to the initial transform, so
// we need to apply the current transform to the shader parameters.
SkMatrix transform = matrix;
transform.postConcat(initialTransform);
// PDF doesn't support kClamp_TileMode, so we simulate it by making
// a pattern the size of the current clip.
SkRect clipStackBounds = clipStack ? clipStack->bounds(deviceBounds)
: SkRect::Make(deviceBounds);
// We need to apply the initial transform to bounds in order to get
// bounds in a consistent coordinate system.
initialTransform.mapRect(&clipStackBounds);
SkIRect bounds;
clipStackBounds.roundOut(&bounds);
auto c = paint.getColor4f();
SkPDFIndirectReference pdfShader = SkPDFMakeShader(doc, shader, transform, bounds,
{c.fR, c.fG, c.fB, 1.0f});
if (pdfShader) {
// pdfShader has been canonicalized so we can directly compare pointers.
entry->fShaderIndex = add_resource(*shaderResources, pdfShader);
}
}
}
SkPDFIndirectReference newGraphicState;
if (color == paint.getColor4f()) {
newGraphicState = SkPDFGraphicState::GetGraphicStateForPaint(doc, paint);
} else {
SkPaint newPaint = paint;
newPaint.setColor4f(color, nullptr);
newGraphicState = SkPDFGraphicState::GetGraphicStateForPaint(doc, newPaint);
}
entry->fGraphicStateIndex = add_resource(*graphicStateResources, newGraphicState);
entry->fTextScaleX = textScale;
}
SkDynamicMemoryWStream* SkPDFDevice::setUpContentEntry(const SkClipStack* clipStack,
const SkMatrix& matrix,
const SkPaint& paint,
SkScalar textScale,
SkPDFIndirectReference* dst) {
SkASSERT(!*dst);
SkBlendMode blendMode = paint.getBlendMode_or(SkBlendMode::kSrcOver);
// Dst xfer mode doesn't draw source at all.
if (blendMode == SkBlendMode::kDst) {
return nullptr;
}
// For the following modes, we want to handle source and destination
// separately, so make an object of what's already there.
if (!treat_as_regular_pdf_blend_mode(blendMode) && blendMode != SkBlendMode::kDstOver) {
if (!isContentEmpty()) {
*dst = this->makeFormXObjectFromDevice();
SkASSERT(isContentEmpty());
} else if (blendMode != SkBlendMode::kSrc &&
blendMode != SkBlendMode::kSrcOut) {
// Except for Src and SrcOut, if there isn't anything already there,
// then we're done.
return nullptr;
}
}
// TODO(vandebo): Figure out how/if we can handle the following modes:
// Xor, Plus. For now, we treat them as SrcOver/Normal.
if (treat_as_regular_pdf_blend_mode(blendMode)) {
if (!fActiveStackState.fContentStream) {
if (fContent.bytesWritten() != 0) {
fContent.writeText("Q\nq\n");
fNeedsExtraSave = true;
}
fActiveStackState = SkPDFGraphicStackState(&fContent);
} else {
SkASSERT(fActiveStackState.fContentStream = &fContent);
}
} else {
fActiveStackState.drainStack();
fActiveStackState = SkPDFGraphicStackState(&fContentBuffer);
}
SkASSERT(fActiveStackState.fContentStream);
SkPDFGraphicStackState::Entry entry;
populate_graphic_state_entry_from_paint(
fDocument,
matrix,
clipStack,
this->bounds(),
paint,
fInitialTransform,
textScale,
&entry,
&fShaderResources,
&fGraphicStateResources);
fActiveStackState.updateClip(clipStack, this->bounds());
fActiveStackState.updateMatrix(entry.fMatrix);
fActiveStackState.updateDrawingState(entry);
return fActiveStackState.fContentStream;
}
void SkPDFDevice::finishContentEntry(const SkClipStack* clipStack,
SkBlendMode blendMode,
SkPDFIndirectReference dst,
SkPath* shape) {
SkASSERT(blendMode != SkBlendMode::kDst);
if (treat_as_regular_pdf_blend_mode(blendMode)) {
SkASSERT(!dst);
return;
}
SkASSERT(fActiveStackState.fContentStream);
fActiveStackState.drainStack();
fActiveStackState = SkPDFGraphicStackState();
if (blendMode == SkBlendMode::kDstOver) {
SkASSERT(!dst);
if (fContentBuffer.bytesWritten() != 0) {
if (fContent.bytesWritten() != 0) {
fContentBuffer.writeText("Q\nq\n");
fNeedsExtraSave = true;
}
fContentBuffer.prependToAndReset(&fContent);
SkASSERT(fContentBuffer.bytesWritten() == 0);
}
return;
}
if (fContentBuffer.bytesWritten() != 0) {
if (fContent.bytesWritten() != 0) {
fContent.writeText("Q\nq\n");
fNeedsExtraSave = true;
}
fContentBuffer.writeToAndReset(&fContent);
SkASSERT(fContentBuffer.bytesWritten() == 0);
}
if (!dst) {
SkASSERT(blendMode == SkBlendMode::kSrc ||
blendMode == SkBlendMode::kSrcOut);
return;
}
SkASSERT(dst);
// Changing the current content into a form-xobject will destroy the clip
// objects which is fine since the xobject will already be clipped. However
// if source has shape, we need to clip it too, so a copy of the clip is
// saved.
SkPaint stockPaint;
SkPDFIndirectReference srcFormXObject;
if (this->isContentEmpty()) {
// If nothing was drawn and there's no shape, then the draw was a
// no-op, but dst needs to be restored for that to be true.
// If there is shape, then an empty source with Src, SrcIn, SrcOut,
// DstIn, DstAtop or Modulate reduces to Clear and DstOut or SrcAtop
// reduces to Dst.
if (shape == nullptr || blendMode == SkBlendMode::kDstOut ||
blendMode == SkBlendMode::kSrcATop) {
ScopedContentEntry content(this, nullptr, SkMatrix::I(), stockPaint);
this->drawFormXObject(dst, content.stream(), nullptr);
return;
} else {
blendMode = SkBlendMode::kClear;
}
} else {
srcFormXObject = this->makeFormXObjectFromDevice();
}
// TODO(vandebo) srcFormXObject may contain alpha, but here we want it
// without alpha.
if (blendMode == SkBlendMode::kSrcATop) {
// TODO(vandebo): In order to properly support SrcATop we have to track
// the shape of what's been drawn at all times. It's the intersection of
// the non-transparent parts of the device and the outlines (shape) of
// all images and devices drawn.
this->drawFormXObjectWithMask(srcFormXObject, dst, SkBlendMode::kSrcOver, true);
} else {
if (shape != nullptr) {
// Draw shape into a form-xobject.
SkPaint filledPaint;
filledPaint.setColor(SK_ColorBLACK);
filledPaint.setStyle(SkPaint::kFill_Style);
SkClipStack empty;
SkPDFDevice shapeDev(this->size(), fDocument, fInitialTransform);
shapeDev.internalDrawPath(clipStack ? *clipStack : empty,
SkMatrix::I(), *shape, filledPaint, true);
this->drawFormXObjectWithMask(dst, shapeDev.makeFormXObjectFromDevice(),
SkBlendMode::kSrcOver, true);
} else {
this->drawFormXObjectWithMask(dst, srcFormXObject, SkBlendMode::kSrcOver, true);
}
}
if (blendMode == SkBlendMode::kClear) {
return;
} else if (blendMode == SkBlendMode::kSrc ||
blendMode == SkBlendMode::kDstATop) {
ScopedContentEntry content(this, nullptr, SkMatrix::I(), stockPaint);
if (content) {
this->drawFormXObject(srcFormXObject, content.stream(), nullptr);
}
if (blendMode == SkBlendMode::kSrc) {
return;
}
} else if (blendMode == SkBlendMode::kSrcATop) {
ScopedContentEntry content(this, nullptr, SkMatrix::I(), stockPaint);
if (content) {
this->drawFormXObject(dst, content.stream(), nullptr);
}
}
SkASSERT(blendMode == SkBlendMode::kSrcIn ||
blendMode == SkBlendMode::kDstIn ||
blendMode == SkBlendMode::kSrcOut ||
blendMode == SkBlendMode::kDstOut ||
blendMode == SkBlendMode::kSrcATop ||
blendMode == SkBlendMode::kDstATop ||
blendMode == SkBlendMode::kModulate);
if (blendMode == SkBlendMode::kSrcIn ||
blendMode == SkBlendMode::kSrcOut ||
blendMode == SkBlendMode::kSrcATop) {
this->drawFormXObjectWithMask(srcFormXObject, dst, SkBlendMode::kSrcOver,
blendMode == SkBlendMode::kSrcOut);
return;
} else {
SkBlendMode mode = SkBlendMode::kSrcOver;
if (blendMode == SkBlendMode::kModulate) {
this->drawFormXObjectWithMask(srcFormXObject, dst, SkBlendMode::kSrcOver, false);
mode = SkBlendMode::kMultiply;
}
this->drawFormXObjectWithMask(dst, srcFormXObject, mode, blendMode == SkBlendMode::kDstOut);
return;
}
}
bool SkPDFDevice::isContentEmpty() {
return fContent.bytesWritten() == 0 && fContentBuffer.bytesWritten() == 0;
}
static SkSize rect_to_size(const SkRect& r) { return {r.width(), r.height()}; }
static sk_sp<SkImage> color_filter(const SkImage* image,
SkColorFilter* colorFilter) {
auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(image->dimensions()));
SkASSERT(surface);
SkCanvas* canvas = surface->getCanvas();
canvas->clear(SK_ColorTRANSPARENT);
SkPaint paint;
paint.setColorFilter(sk_ref_sp(colorFilter));
canvas->drawImage(image, 0, 0, SkSamplingOptions(), &paint);
return surface->makeImageSnapshot();
}
////////////////////////////////////////////////////////////////////////////////
static bool is_integer(SkScalar x) {
return x == SkScalarTruncToScalar(x);
}
static bool is_integral(const SkRect& r) {
return is_integer(r.left()) &&
is_integer(r.top()) &&
is_integer(r.right()) &&
is_integer(r.bottom());
}
void SkPDFDevice::internalDrawImageRect(SkKeyedImage imageSubset,
const SkRect* src,
const SkRect& dst,
const SkSamplingOptions& sampling,
const SkPaint& srcPaint,
const SkMatrix& ctm) {
if (this->hasEmptyClip()) {
return;
}
if (!imageSubset) {
return;
}
// First, figure out the src->dst transform and subset the image if needed.
SkIRect bounds = imageSubset.image()->bounds();
SkRect srcRect = src ? *src : SkRect::Make(bounds);
SkMatrix transform = SkMatrix::RectToRect(srcRect, dst);
if (src && *src != SkRect::Make(bounds)) {
if (!srcRect.intersect(SkRect::Make(bounds))) {
return;
}
srcRect.roundOut(&bounds);
transform.preTranslate(SkIntToScalar(bounds.x()),
SkIntToScalar(bounds.y()));
if (bounds != imageSubset.image()->bounds()) {
imageSubset = imageSubset.subset(bounds);
}
if (!imageSubset) {
return;
}
}
// If the image is opaque and the paint's alpha is too, replace
// kSrc blendmode with kSrcOver. http://crbug.com/473572
SkTCopyOnFirstWrite<SkPaint> paint(srcPaint);
if (!paint->isSrcOver() &&
imageSubset.image()->isOpaque() &&
SkBlendFastPath::kSrcOver == CheckFastPath(*paint, false))
{
paint.writable()->setBlendMode(SkBlendMode::kSrcOver);
}
// Alpha-only images need to get their color from the shader, before
// applying the colorfilter.
if (imageSubset.image()->isAlphaOnly() && paint->getColorFilter()) {
// must blend alpha image and shader before applying colorfilter.
auto surface =
SkSurfaces::Raster(SkImageInfo::MakeN32Premul(imageSubset.image()->dimensions()));
SkCanvas* canvas = surface->getCanvas();
SkPaint tmpPaint;
// In the case of alpha images with shaders, the shader's coordinate
// system is the image's coordiantes.
tmpPaint.setShader(sk_ref_sp(paint->getShader()));
tmpPaint.setColor4f(paint->getColor4f(), nullptr);
canvas->clear(0x00000000);
canvas->drawImage(imageSubset.image().get(), 0, 0, sampling, &tmpPaint);
if (paint->getShader() != nullptr) {
paint.writable()->setShader(nullptr);
}
imageSubset = SkKeyedImage(surface->makeImageSnapshot());
SkASSERT(!imageSubset.image()->isAlphaOnly());
}
if (imageSubset.image()->isAlphaOnly()) {
// The ColorFilter applies to the paint color/shader, not the alpha layer.
SkASSERT(nullptr == paint->getColorFilter());
sk_sp<SkImage> mask = alpha_image_to_greyscale_image(imageSubset.image().get());
if (!mask) {
return;
}
// PDF doesn't seem to allow masking vector graphics with an Image XObject.
// Must mask with a Form XObject.
sk_sp<SkPDFDevice> maskDevice = this->makeCongruentDevice();
{
SkCanvas canvas(maskDevice);
// This clip prevents the mask image shader from covering
// entire device if unnecessary.
canvas.clipRect(this->cs().bounds(this->bounds()));
canvas.concat(ctm);
if (paint->getMaskFilter()) {
SkPaint tmpPaint;
tmpPaint.setShader(mask->makeShader(SkSamplingOptions(), transform));
tmpPaint.setMaskFilter(sk_ref_sp(paint->getMaskFilter()));
canvas.drawRect(dst, tmpPaint);
} else {
if (src && !is_integral(*src)) {
canvas.clipRect(dst);
}
canvas.concat(transform);
canvas.drawImage(mask, 0, 0);
}
}
SkIRect maskDeviceBounds = maskDevice->cs().bounds(maskDevice->bounds()).roundOut();
if (!ctm.isIdentity() && paint->getShader()) {
transform_shader(paint.writable(), ctm); // Since we are using identity matrix.
}
ScopedContentEntry content(this, &this->cs(), SkMatrix::I(), *paint);
if (!content) {
return;
}
this->setGraphicState(SkPDFGraphicState::GetSMaskGraphicState(
maskDevice->makeFormXObjectFromDevice(maskDeviceBounds, true), false,
SkPDFGraphicState::kLuminosity_SMaskMode, fDocument), content.stream());
SkPDFUtils::AppendRectangle(SkRect::Make(this->size()), content.stream());
SkPDFUtils::PaintPath(SkPaint::kFill_Style, SkPathFillType::kWinding, content.stream());
this->clearMaskOnGraphicState(content.stream());
return;
}
if (paint->getMaskFilter()) {
paint.writable()->setShader(imageSubset.image()->makeShader(SkSamplingOptions(),
transform));
SkPath path = SkPath::Rect(dst); // handles non-integral clipping.
this->internalDrawPath(this->cs(), this->localToDevice(), path, *paint, true);
return;
}
transform.postConcat(ctm);
bool needToRestore = false;
if (src && !is_integral(*src)) {
// Need sub-pixel clipping to fix https://bug.skia.org/4374
this->cs().save();
this->cs().clipRect(dst, ctm, SkClipOp::kIntersect, true);
needToRestore = true;
}
SK_AT_SCOPE_EXIT(if (needToRestore) { this->cs().restore(); });
SkMatrix matrix = transform;
// Rasterize the bitmap using perspective in a new bitmap.
if (transform.hasPerspective()) {
// Transform the bitmap in the new space, without taking into
// account the initial transform.
SkRect imageBounds = SkRect::Make(imageSubset.image()->bounds());
SkPath perspectiveOutline = SkPath::Rect(imageBounds).makeTransform(transform);
// Retrieve the bounds of the new shape.
SkRect outlineBounds = perspectiveOutline.getBounds();
if (!outlineBounds.intersect(SkRect::Make(this->devClipBounds()))) {
return;
}
// Transform the bitmap in the new space to the final space, to account for DPI
SkRect physicalBounds = fInitialTransform.mapRect(outlineBounds);
SkScalar scaleX = physicalBounds.width() / outlineBounds.width();
SkScalar scaleY = physicalBounds.height() / outlineBounds.height();
// TODO(edisonn): A better approach would be to use a bitmap shader
// (in clamp mode) and draw a rect over the entire bounding box. Then
// intersect perspectiveOutline to the clip. That will avoid introducing
// alpha to the image while still giving good behavior at the edge of
// the image. Avoiding alpha will reduce the pdf size and generation
// CPU time some.
SkISize wh = rect_to_size(physicalBounds).toCeil();
auto surface = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(wh));
if (!surface) {
return;
}
SkCanvas* canvas = surface->getCanvas();
canvas->clear(SK_ColorTRANSPARENT);
SkScalar deltaX = outlineBounds.left();
SkScalar deltaY = outlineBounds.top();
SkMatrix offsetMatrix = transform;
offsetMatrix.postTranslate(-deltaX, -deltaY);
offsetMatrix.postScale(scaleX, scaleY);
// Translate the draw in the new canvas, so we perfectly fit the
// shape in the bitmap.
canvas->setMatrix(offsetMatrix);
canvas->drawImage(imageSubset.image(), 0, 0);
// In the new space, we use the identity matrix translated
// and scaled to reflect DPI.
matrix.setScale(1 / scaleX, 1 / scaleY);
matrix.postTranslate(deltaX, deltaY);
imageSubset = SkKeyedImage(surface->makeImageSnapshot());
if (!imageSubset) {
return;
}
}
SkMatrix scaled;
// Adjust for origin flip.
scaled.setScale(SK_Scalar1, -SK_Scalar1);
scaled.postTranslate(0, SK_Scalar1);
// Scale the image up from 1x1 to WxH.
SkIRect subset = imageSubset.image()->bounds();
scaled.postScale(SkIntToScalar(subset.width()),
SkIntToScalar(subset.height()));
scaled.postConcat(matrix);
ScopedContentEntry content(this, &this->cs(), scaled, *paint);
if (!content) {
return;
}
SkPath shape = SkPath::Rect(SkRect::Make(subset)).makeTransform(matrix);
if (content.needShape()) {
content.setShape(shape);
}
if (!content.needSource()) {
return;
}
if (SkColorFilter* colorFilter = paint->getColorFilter()) {
sk_sp<SkImage> img = color_filter(imageSubset.image().get(), colorFilter);
imageSubset = SkKeyedImage(std::move(img));
if (!imageSubset) {
return;
}
// TODO(halcanary): de-dupe this by caching filtered images.
// (maybe in the resource cache?)
}
SkBitmapKey key = imageSubset.key();
SkPDFIndirectReference* pdfimagePtr = fDocument->fPDFBitmapMap.find(key);
SkPDFIndirectReference pdfimage = pdfimagePtr ? *pdfimagePtr : SkPDFIndirectReference();
if (!pdfimagePtr) {
SkASSERT(imageSubset);
pdfimage = SkPDFSerializeImage(imageSubset.image().get(), fDocument,
fDocument->metadata().fEncodingQuality);
SkASSERT((key != SkBitmapKey{{0, 0, 0, 0}, 0}));
fDocument->fPDFBitmapMap.set(key, pdfimage);
}
SkASSERT(pdfimage != SkPDFIndirectReference());
this->drawFormXObject(pdfimage, content.stream(), &shape);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
void SkPDFDevice::drawDevice(SkDevice* device, const SkSamplingOptions& sampling,
const SkPaint& paint) {
SkASSERT(!paint.getImageFilter());
SkASSERT(!paint.getMaskFilter());
// Check if the source device is really a bitmapdevice (because that's what we returned
// from createDevice (an image filter would go through drawSpecial, but createDevice uses
// a raster device to apply color filters, too).
SkPixmap pmap;
if (device->peekPixels(&pmap)) {
this->SkClipStackDevice::drawDevice(device, sampling, paint);
return;
}
// our onCreateCompatibleDevice() always creates SkPDFDevice subclasses.
SkPDFDevice* pdfDevice = static_cast<SkPDFDevice*>(device);
if (pdfDevice->isContentEmpty()) {
return;
}
SkMatrix matrix = device->getRelativeTransform(*this);
ScopedContentEntry content(this, &this->cs(), matrix, paint);
if (!content) {
return;
}
SkPath shape = SkPath::Rect(SkRect::Make(device->imageInfo().dimensions()));
shape.transform(matrix);
if (content.needShape()) {
content.setShape(shape);
}
if (!content.needSource()) {
return;
}
this->drawFormXObject(pdfDevice->makeFormXObjectFromDevice(), content.stream(), &shape);
}
void SkPDFDevice::drawSpecial(SkSpecialImage* srcImg, const SkMatrix& localToDevice,
const SkSamplingOptions& sampling, const SkPaint& paint) {
if (this->hasEmptyClip()) {
return;
}
SkASSERT(!srcImg->isGaneshBacked() && !srcImg->isGraphiteBacked());
SkASSERT(!paint.getMaskFilter() && !paint.getImageFilter());
SkBitmap resultBM;
if (srcImg->getROPixels(&resultBM)) {
auto r = SkRect::MakeWH(resultBM.width(), resultBM.height());
this->internalDrawImageRect(SkKeyedImage(resultBM), nullptr, r, sampling, paint,
localToDevice);
}
}
sk_sp<SkSpecialImage> SkPDFDevice::makeSpecial(const SkBitmap& bitmap) {
return SkSpecialImages::MakeFromRaster(bitmap.bounds(), bitmap, this->surfaceProps());
}
sk_sp<SkSpecialImage> SkPDFDevice::makeSpecial(const SkImage* image) {
return SkSpecialImages::MakeFromRaster(
image->bounds(), image->makeNonTextureImage(), this->surfaceProps());
}