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gerrit-public.fairphone.software / platform / external / skia / 6504cfdfc035f0a2cb854be9df352159873b9d62 / . / src / pdf / SkPDFDevice.cpp
blob: e2dfba6941993ff6b1dc81acfa02e4ad673fb248 [file] [log] [blame]
/*
* Copyright (C) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SkPDFDevice.h"
#include "SkColor.h"
#include "SkClipStack.h"
#include "SkData.h"
#include "SkDraw.h"
#include "SkGlyphCache.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPDFFont.h"
#include "SkPDFFormXObject.h"
#include "SkPDFGraphicState.h"
#include "SkPDFImage.h"
#include "SkPDFShader.h"
#include "SkPDFStream.h"
#include "SkPDFTypes.h"
#include "SkPDFUtils.h"
#include "SkRect.h"
#include "SkString.h"
#include "SkTextFormatParams.h"
#include "SkTypeface.h"
#include "SkTypes.h"
// Utility functions
static void emit_pdf_color(SkColor color, SkWStream* result) {
SkASSERT(SkColorGetA(color) == 0xFF); // We handle alpha elsewhere.
SkScalar colorMax = SkIntToScalar(0xFF);
SkPDFScalar::Append(
SkScalarDiv(SkIntToScalar(SkColorGetR(color)), colorMax), result);
result->writeText(" ");
SkPDFScalar::Append(
SkScalarDiv(SkIntToScalar(SkColorGetG(color)), colorMax), result);
result->writeText(" ");
SkPDFScalar::Append(
SkScalarDiv(SkIntToScalar(SkColorGetB(color)), colorMax), result);
result->writeText(" ");
}
static SkPaint calculate_text_paint(const SkPaint& paint) {
SkPaint result = paint;
if (result.isFakeBoldText()) {
SkScalar fakeBoldScale = SkScalarInterpFunc(result.getTextSize(),
kStdFakeBoldInterpKeys,
kStdFakeBoldInterpValues,
kStdFakeBoldInterpLength);
SkScalar width = SkScalarMul(result.getTextSize(), fakeBoldScale);
if (result.getStyle() == SkPaint::kFill_Style)
result.setStyle(SkPaint::kStrokeAndFill_Style);
else
width += result.getStrokeWidth();
result.setStrokeWidth(width);
}
return result;
}
// Stolen from measure_text in SkDraw.cpp and then tweaked.
static void align_text(SkDrawCacheProc glyphCacheProc, const SkPaint& paint,
const uint16_t* glyphs, size_t len, SkScalar* x,
SkScalar* y, SkScalar* width) {
if (paint.getTextAlign() == SkPaint::kLeft_Align && width == NULL)
return;
SkMatrix ident;
ident.reset();
SkAutoGlyphCache autoCache(paint, &ident);
SkGlyphCache* cache = autoCache.getCache();
const char* start = (char*)glyphs;
const char* stop = (char*)(glyphs + len);
SkFixed xAdv = 0, yAdv = 0;
// TODO(vandebo) This probably needs to take kerning into account.
while (start < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &start, 0, 0);
xAdv += glyph.fAdvanceX;
yAdv += glyph.fAdvanceY;
};
if (width)
*width = SkFixedToScalar(xAdv);
if (paint.getTextAlign() == SkPaint::kLeft_Align)
return;
SkScalar xAdj = SkFixedToScalar(xAdv);
SkScalar yAdj = SkFixedToScalar(yAdv);
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
xAdj = SkScalarHalf(xAdj);
yAdj = SkScalarHalf(yAdj);
}
*x = *x - xAdj;
*y = *y - yAdj;
}
static void set_text_transform(SkScalar x, SkScalar y, SkScalar textSkewX,
SkWStream* content) {
// Flip the text about the x-axis to account for origin swap and include
// the passed parameters.
content->writeText("1 0 ");
SkPDFScalar::Append(0 - textSkewX, content);
content->writeText(" -1 ");
SkPDFScalar::Append(x, content);
content->writeText(" ");
SkPDFScalar::Append(y, content);
content->writeText(" Tm\n");
}
// It is important to not confuse GraphicStateEntry with SkPDFGraphicState, the
// later being our representation of an object in the PDF file.
struct GraphicStateEntry {
GraphicStateEntry();
// Compare the fields we care about when setting up a new content entry.
bool compareInitialState(const GraphicStateEntry& b);
SkMatrix fMatrix;
// We can't do set operations on Paths, though PDF natively supports
// intersect. If the clip stack does anything other than intersect,
// we have to fall back to the region. Treat fClipStack as authoritative.
// See http://code.google.com/p/skia/issues/detail?id=221
SkClipStack fClipStack;
SkRegion fClipRegion;
// When emitting the content entry, we will ensure the graphic state
// is set to these values first.
SkColor fColor;
SkScalar fTextScaleX; // Zero means we don't care what the value is.
SkPaint::Style fTextFill; // Only if TextScaleX is non-zero.
int fShaderIndex;
int fGraphicStateIndex;
// We may change the font (i.e. for Type1 support) within a
// ContentEntry. This is the one currently in effect, or NULL if none.
SkPDFFont* fFont;
// In PDF, text size has no default value. It is only valid if fFont is
// not NULL.
SkScalar fTextSize;
};
GraphicStateEntry::GraphicStateEntry() : fColor(SK_ColorBLACK),
fTextScaleX(SK_Scalar1),
fTextFill(SkPaint::kFill_Style),
fShaderIndex(-1),
fGraphicStateIndex(-1),
fFont(NULL),
fTextSize(SK_ScalarNaN) {
fMatrix.reset();
}
bool GraphicStateEntry::compareInitialState(const GraphicStateEntry& b) {
return fColor == b.fColor &&
fShaderIndex == b.fShaderIndex &&
fGraphicStateIndex == b.fGraphicStateIndex &&
fMatrix == b.fMatrix &&
fClipStack == b.fClipStack &&
(fTextScaleX == 0 ||
b.fTextScaleX == 0 ||
(fTextScaleX == b.fTextScaleX && fTextFill == b.fTextFill));
}
class GraphicStackState {
public:
GraphicStackState(const SkClipStack& existingClipStack,
const SkRegion& existingClipRegion,
SkWStream* contentStream)
: fStackDepth(0),
fContentStream(contentStream) {
fEntries[0].fClipStack = existingClipStack;
fEntries[0].fClipRegion = existingClipRegion;
}
void updateClip(const SkClipStack& clipStack, const SkRegion& clipRegion,
const SkIPoint& translation);
void updateMatrix(const SkMatrix& matrix);
void updateDrawingState(const GraphicStateEntry& state);
void drainStack();
private:
void push();
void pop();
GraphicStateEntry* currentEntry() { return &fEntries[fStackDepth]; }
// Conservative limit on save depth, see impl. notes in PDF 1.4 spec.
static const int kMaxStackDepth = 12;
GraphicStateEntry fEntries[kMaxStackDepth + 1];
int fStackDepth;
SkWStream* fContentStream;
};
void GraphicStackState::drainStack() {
while (fStackDepth) {
pop();
}
}
void GraphicStackState::push() {
SkASSERT(fStackDepth < kMaxStackDepth);
fContentStream->writeText("q\n");
fStackDepth++;
fEntries[fStackDepth] = fEntries[fStackDepth - 1];
}
void GraphicStackState::pop() {
SkASSERT(fStackDepth > 0);
fContentStream->writeText("Q\n");
fStackDepth--;
}
// This function initializes iter to be an interator on the "stack" argument
// and then skips over the leading entries as specified in prefix. It requires
// and asserts that "prefix" will be a prefix to "stack."
static void skip_clip_stack_prefix(const SkClipStack& prefix,
const SkClipStack& stack,
SkClipStack::B2FIter* iter) {
SkClipStack::B2FIter prefixIter(prefix);
iter->reset(stack);
const SkClipStack::B2FIter::Clip* prefixEntry;
const SkClipStack::B2FIter::Clip* iterEntry;
int count = 0;
for (prefixEntry = prefixIter.next(); prefixEntry;
prefixEntry = prefixIter.next(), count++) {
iterEntry = iter->next();
SkASSERT(iterEntry);
// Because of SkClipStack does internal intersection, the last clip
// entry may differ.
if(*prefixEntry != *iterEntry) {
SkASSERT(prefixEntry->fOp == SkRegion::kIntersect_Op);
SkASSERT(iterEntry->fOp == SkRegion::kIntersect_Op);
SkASSERT((iterEntry->fRect == NULL) ==
(prefixEntry->fRect == NULL));
SkASSERT((iterEntry->fPath == NULL) ==
(prefixEntry->fPath == NULL));
// We need to back up the iterator by one but don't have that
// function, so reset and go forward by one less.
iter->reset(stack);
for (int i = 0; i < count; i++) {
iter->next();
}
prefixEntry = prefixIter.next();
break;
}
}
SkASSERT(prefixEntry == NULL);
}
static void emit_clip(SkPath* clipPath, SkRect* clipRect,
SkWStream* contentStream) {
SkASSERT(clipPath || clipRect);
SkPath::FillType clipFill;
if (clipPath) {
SkPDFUtils::EmitPath(*clipPath, contentStream);
clipFill = clipPath->getFillType();
} else {
SkPDFUtils::AppendRectangle(*clipRect, contentStream);
clipFill = SkPath::kWinding_FillType;
}
NOT_IMPLEMENTED(clipFill == SkPath::kInverseEvenOdd_FillType, false);
NOT_IMPLEMENTED(clipFill == SkPath::kInverseWinding_FillType, false);
if (clipFill == SkPath::kEvenOdd_FillType) {
contentStream->writeText("W* n\n");
} else {
contentStream->writeText("W n\n");
}
}
// TODO(vandebo) Take advantage of SkClipStack::getSaveCount(), the PDF
// graphic state stack, and the fact that we can know all the clips used
// on the page to optimize this.
void GraphicStackState::updateClip(const SkClipStack& clipStack,
const SkRegion& clipRegion,
const SkIPoint& translation) {
if (clipStack == currentEntry()->fClipStack) {
return;
}
while (fStackDepth > 0) {
pop();
if (clipStack == currentEntry()->fClipStack) {
return;
}
}
push();
// gsState->initialEntry()->fClipStack/Region specifies the clip that has
// already been applied. (If this is a top level device, then it specifies
// a clip to the content area. If this is a layer, then it specifies
// the clip in effect when the layer was created.) There's no need to
// reapply that clip; SKCanvas's SkDrawIter will draw anything outside the
// initial clip on the parent layer. (This means there's a bug if the user
// expands the clip and then uses any xfer mode that uses dst:
// http://code.google.com/p/skia/issues/detail?id=228 )
SkClipStack::B2FIter iter;
skip_clip_stack_prefix(fEntries[0].fClipStack, clipStack, &iter);
// If the clip stack does anything other than intersect or if it uses
// an inverse fill type, we have to fall back to the clip region.
bool needRegion = false;
const SkClipStack::B2FIter::Clip* clipEntry;
for (clipEntry = iter.next(); clipEntry; clipEntry = iter.next()) {
if (clipEntry->fOp != SkRegion::kIntersect_Op ||
(clipEntry->fPath && clipEntry->fPath->isInverseFillType())) {
needRegion = true;
break;
}
}
if (needRegion) {
SkPath clipPath;
SkAssertResult(clipRegion.getBoundaryPath(&clipPath));
emit_clip(&clipPath, NULL, fContentStream);
} else {
skip_clip_stack_prefix(fEntries[0].fClipStack, clipStack, &iter);
SkMatrix transform;
transform.setTranslate(translation.fX, translation.fY);
const SkClipStack::B2FIter::Clip* clipEntry;
for (clipEntry = iter.next(); clipEntry; clipEntry = iter.next()) {
SkASSERT(clipEntry->fOp == SkRegion::kIntersect_Op);
if (clipEntry->fRect) {
SkRect translatedClip;
transform.mapRect(&translatedClip, *clipEntry->fRect);
emit_clip(NULL, &translatedClip, fContentStream);
} else if (clipEntry->fPath) {
SkPath translatedPath;
clipEntry->fPath->transform(transform, &translatedPath);
emit_clip(&translatedPath, NULL, fContentStream);
} else {
SkASSERT(false);
}
}
}
currentEntry()->fClipStack = clipStack;
currentEntry()->fClipRegion = clipRegion;
}
void GraphicStackState::updateMatrix(const SkMatrix& matrix) {
if (matrix == currentEntry()->fMatrix) {
return;
}
if (currentEntry()->fMatrix.getType() != SkMatrix::kIdentity_Mask) {
SkASSERT(fStackDepth > 0);
SkASSERT(fEntries[fStackDepth].fClipStack ==
fEntries[fStackDepth -1].fClipStack);
pop();
SkASSERT(currentEntry()->fMatrix.getType() == SkMatrix::kIdentity_Mask);
}
if (matrix.getType() == SkMatrix::kIdentity_Mask) {
return;
}
push();
SkPDFUtils::AppendTransform(matrix, fContentStream);
currentEntry()->fMatrix = matrix;
}
void GraphicStackState::updateDrawingState(const GraphicStateEntry& state) {
// PDF treats a shader as a color, so we only set one or the other.
if (state.fShaderIndex >= 0) {
if (state.fShaderIndex != currentEntry()->fShaderIndex) {
fContentStream->writeText("/Pattern CS /Pattern cs /P");
fContentStream->writeDecAsText(state.fShaderIndex);
fContentStream->writeText(" SCN /P");
fContentStream->writeDecAsText(state.fShaderIndex);
fContentStream->writeText(" scn\n");
currentEntry()->fShaderIndex = state.fShaderIndex;
}
} else {
if (state.fColor != currentEntry()->fColor ||
currentEntry()->fShaderIndex >= 0) {
emit_pdf_color(state.fColor, fContentStream);
fContentStream->writeText("RG ");
emit_pdf_color(state.fColor, fContentStream);
fContentStream->writeText("rg\n");
currentEntry()->fColor = state.fColor;
currentEntry()->fShaderIndex = -1;
}
}
if (state.fGraphicStateIndex != currentEntry()->fGraphicStateIndex) {
SkPDFUtils::ApplyGraphicState(state.fGraphicStateIndex, fContentStream);
currentEntry()->fGraphicStateIndex = state.fGraphicStateIndex;
}
if (state.fTextScaleX) {
if (state.fTextScaleX != currentEntry()->fTextScaleX) {
SkScalar pdfScale = SkScalarMul(state.fTextScaleX,
SkIntToScalar(100));
SkPDFScalar::Append(pdfScale, fContentStream);
fContentStream->writeText(" Tz\n");
currentEntry()->fTextScaleX = state.fTextScaleX;
}
if (state.fTextFill != currentEntry()->fTextFill) {
SK_COMPILE_ASSERT(SkPaint::kFill_Style == 0, enum_must_match_value);
SK_COMPILE_ASSERT(SkPaint::kStroke_Style == 1,
enum_must_match_value);
SK_COMPILE_ASSERT(SkPaint::kStrokeAndFill_Style == 2,
enum_must_match_value);
fContentStream->writeDecAsText(state.fTextFill);
fContentStream->writeText(" Tr\n");
currentEntry()->fTextFill = state.fTextFill;
}
}
}
SkDevice* SkPDFDevice::onCreateCompatibleDevice(SkBitmap::Config config,
int width, int height,
bool isOpaque,
Usage usage) {
SkMatrix initialTransform;
initialTransform.reset();
SkISize size = SkISize::Make(width, height);
return SkNEW_ARGS(SkPDFDevice, (size, size, initialTransform));
}
struct ContentEntry {
GraphicStateEntry fState;
SkDynamicMemoryWStream fContent;
SkTScopedPtr<ContentEntry> fNext;
};
// 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 SkDraw& draw,
const SkPaint& paint, bool hasText = false)
: fDevice(device),
fContentEntry(NULL),
fXfermode(SkXfermode::kSrcOver_Mode) {
init(draw.fClipStack, *draw.fClip, *draw.fMatrix, paint, hasText);
}
ScopedContentEntry(SkPDFDevice* device, const SkClipStack* clipStack,
const SkRegion& clipRegion, const SkMatrix& matrix,
const SkPaint& paint, bool hasText = false)
: fDevice(device),
fContentEntry(NULL),
fXfermode(SkXfermode::kSrcOver_Mode) {
init(clipStack, clipRegion, matrix, paint, hasText);
}
~ScopedContentEntry() {
if (fContentEntry) {
fDevice->finishContentEntry(fXfermode, fDstFormXObject.get());
}
}
ContentEntry* entry() { return fContentEntry; }
private:
SkPDFDevice* fDevice;
ContentEntry* fContentEntry;
SkXfermode::Mode fXfermode;
SkRefPtr<SkPDFFormXObject> fDstFormXObject;
void init(const SkClipStack* clipStack, const SkRegion& clipRegion,
const SkMatrix& matrix, const SkPaint& paint, bool hasText) {
if (paint.getXfermode()) {
paint.getXfermode()->asMode(&fXfermode);
}
fContentEntry = fDevice->setUpContentEntry(clipStack, clipRegion,
matrix, paint, hasText,
&fDstFormXObject);
}
};
////////////////////////////////////////////////////////////////////////////////
static inline SkBitmap makeContentBitmap(const SkISize& contentSize,
const SkMatrix* initialTransform) {
SkBitmap bitmap;
if (initialTransform) {
// Compute the size of the drawing area.
SkVector drawingSize;
SkMatrix inverse;
drawingSize.set(contentSize.fWidth, contentSize.fHeight);
initialTransform->invert(&inverse);
inverse.mapVectors(&drawingSize, 1);
SkISize size = SkSize::Make(drawingSize.fX, drawingSize.fY).toRound();
bitmap.setConfig(SkBitmap::kNo_Config, abs(size.fWidth),
abs(size.fHeight));
} else {
bitmap.setConfig(SkBitmap::kNo_Config, abs(contentSize.fWidth),
abs(contentSize.fHeight));
}
return bitmap;
}
SkPDFDevice::SkPDFDevice(const SkISize& pageSize, const SkISize& contentSize,
const SkMatrix& initialTransform)
: SkDevice(makeContentBitmap(contentSize, &initialTransform)),
fPageSize(pageSize),
fContentSize(contentSize),
fLastContentEntry(NULL),
fLastMarginContentEntry(NULL) {
// Skia generally uses the top left as the origin but PDF natively has the
// origin at the bottom left. This matrix corrects for that. But that only
// needs to be done once, we don't do it when layering.
fInitialTransform.setTranslate(0, pageSize.fHeight);
fInitialTransform.preScale(1, -1);
fInitialTransform.preConcat(initialTransform);
SkIRect existingClip = SkIRect::MakeWH(this->width(), this->height());
fExistingClipStack.clipDevRect(existingClip);
fExistingClipRegion.setRect(existingClip);
this->init();
}
SkPDFDevice::SkPDFDevice(const SkISize& layerSize,
const SkClipStack& existingClipStack,
const SkRegion& existingClipRegion)
: SkDevice(makeContentBitmap(layerSize, NULL)),
fPageSize(layerSize),
fContentSize(layerSize),
fExistingClipStack(existingClipStack),
fExistingClipRegion(existingClipRegion),
fLastContentEntry(NULL),
fLastMarginContentEntry(NULL) {
fInitialTransform.reset();
this->init();
}
SkPDFDevice::~SkPDFDevice() {
this->cleanUp(true);
}
void SkPDFDevice::init() {
fResourceDict = NULL;
fContentEntries.reset();
fLastContentEntry = NULL;
fMarginContentEntries.reset();
fLastMarginContentEntry = NULL;
fDrawingArea = kContent_DrawingArea;
if (fFontGlyphUsage == NULL) {
fFontGlyphUsage.reset(new SkPDFGlyphSetMap());
}
}
void SkPDFDevice::cleanUp(bool clearFontUsage) {
fGraphicStateResources.unrefAll();
fXObjectResources.unrefAll();
fFontResources.unrefAll();
fShaderResources.unrefAll();
if (clearFontUsage) {
fFontGlyphUsage->reset();
}
}
void SkPDFDevice::clear(SkColor color) {
this->cleanUp(true);
this->init();
SkPaint paint;
paint.setColor(color);
paint.setStyle(SkPaint::kFill_Style);
SkMatrix identity;
identity.reset();
ScopedContentEntry content(this, &fExistingClipStack, fExistingClipRegion,
identity, paint);
internalDrawPaint(paint, content.entry());
}
void SkPDFDevice::drawPaint(const SkDraw& d, const SkPaint& paint) {
SkPaint newPaint = paint;
newPaint.setStyle(SkPaint::kFill_Style);
ScopedContentEntry content(this, d, newPaint);
internalDrawPaint(newPaint, content.entry());
}
void SkPDFDevice::internalDrawPaint(const SkPaint& paint,
ContentEntry* contentEntry) {
if (!contentEntry) {
return;
}
SkRect bbox = SkRect::MakeWH(SkIntToScalar(this->width()),
SkIntToScalar(this->height()));
SkMatrix totalTransform = fInitialTransform;
totalTransform.preConcat(contentEntry->fState.fMatrix);
SkMatrix inverse;
inverse.reset();
totalTransform.invert(&inverse);
inverse.mapRect(&bbox);
SkPDFUtils::AppendRectangle(bbox, &contentEntry->fContent);
SkPDFUtils::PaintPath(paint.getStyle(), SkPath::kWinding_FillType,
&contentEntry->fContent);
}
void SkPDFDevice::drawPoints(const SkDraw& d, SkCanvas::PointMode mode,
size_t count, const SkPoint* points,
const SkPaint& passedPaint) {
if (count == 0) {
return;
}
// SkDraw::drawPoints converts to multiple calls to fDevice->drawPath.
// We only use this when there's a path effect because of the overhead
// of multiple calls to setUpContentEntry it causes.
if (passedPaint.getPathEffect()) {
if (d.fClip->isEmpty()) {
return;
}
SkDraw pointDraw(d);
pointDraw.fDevice = this;
pointDraw.drawPoints(mode, count, points, passedPaint, true);
return;
}
const SkPaint* paint = &passedPaint;
SkPaint modifiedPaint;
if (mode == SkCanvas::kPoints_PointMode &&
paint->getStrokeCap() != SkPaint::kRound_Cap) {
modifiedPaint = *paint;
paint = &modifiedPaint;
if (paint->getStrokeWidth()) {
// PDF won't draw a single point with square/butt caps because the
// orientation is ambiguous. Draw a rectangle instead.
modifiedPaint.setStyle(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);
drawRect(d, r, modifiedPaint);
}
return;
} else {
modifiedPaint.setStrokeCap(SkPaint::kRound_Cap);
}
}
ScopedContentEntry content(this, d, *paint);
if (!content.entry()) {
return;
}
switch (mode) {
case SkCanvas::kPolygon_PointMode:
SkPDFUtils::MoveTo(points[0].fX, points[0].fY,
&content.entry()->fContent);
for (size_t i = 1; i < count; i++) {
SkPDFUtils::AppendLine(points[i].fX, points[i].fY,
&content.entry()->fContent);
}
SkPDFUtils::StrokePath(&content.entry()->fContent);
break;
case SkCanvas::kLines_PointMode:
for (size_t i = 0; i < count/2; i++) {
SkPDFUtils::MoveTo(points[i * 2].fX, points[i * 2].fY,
&content.entry()->fContent);
SkPDFUtils::AppendLine(points[i * 2 + 1].fX,
points[i * 2 + 1].fY,
&content.entry()->fContent);
SkPDFUtils::StrokePath(&content.entry()->fContent);
}
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,
&content.entry()->fContent);
SkPDFUtils::ClosePath(&content.entry()->fContent);
SkPDFUtils::StrokePath(&content.entry()->fContent);
}
break;
default:
SkASSERT(false);
}
}
void SkPDFDevice::drawRect(const SkDraw& d, const SkRect& r,
const SkPaint& paint) {
if (paint.getPathEffect()) {
if (d.fClip->isEmpty()) {
return;
}
SkPath path;
path.addRect(r);
drawPath(d, path, paint, NULL, true);
return;
}
ScopedContentEntry content(this, d, paint);
if (!content.entry()) {
return;
}
SkPDFUtils::AppendRectangle(r, &content.entry()->fContent);
SkPDFUtils::PaintPath(paint.getStyle(), SkPath::kWinding_FillType,
&content.entry()->fContent);
}
void SkPDFDevice::drawPath(const SkDraw& d, const SkPath& origPath,
const SkPaint& paint, const SkMatrix* prePathMatrix,
bool pathIsMutable) {
SkPath modifiedPath;
SkPath* pathPtr = const_cast<SkPath*>(&origPath);
SkMatrix matrix = *d.fMatrix;
if (prePathMatrix) {
if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) {
if (!pathIsMutable) {
pathPtr = &modifiedPath;
pathIsMutable = true;
}
origPath.transform(*prePathMatrix, pathPtr);
} else {
if (!matrix.preConcat(*prePathMatrix)) {
return;
}
}
}
if (paint.getPathEffect()) {
if (d.fClip->isEmpty()) {
return;
}
if (!pathIsMutable) {
pathPtr = &modifiedPath;
pathIsMutable = true;
}
bool fill = paint.getFillPath(origPath, pathPtr);
SkPaint noEffectPaint(paint);
noEffectPaint.setPathEffect(NULL);
if (fill) {
noEffectPaint.setStyle(SkPaint::kFill_Style);
} else {
noEffectPaint.setStyle(SkPaint::kStroke_Style);
noEffectPaint.setStrokeWidth(0);
}
drawPath(d, *pathPtr, noEffectPaint, NULL, true);
return;
}
ScopedContentEntry content(this, d, paint);
if (!content.entry()) {
return;
}
SkPDFUtils::EmitPath(*pathPtr, &content.entry()->fContent);
SkPDFUtils::PaintPath(paint.getStyle(), pathPtr->getFillType(),
&content.entry()->fContent);
}
void SkPDFDevice::drawBitmap(const SkDraw& d, const SkBitmap& bitmap,
const SkIRect* srcRect, const SkMatrix& matrix,
const SkPaint& paint) {
if (d.fClip->isEmpty()) {
return;
}
SkMatrix transform = matrix;
transform.postConcat(*d.fMatrix);
internalDrawBitmap(transform, d.fClipStack, *d.fClip, bitmap, srcRect,
paint);
}
void SkPDFDevice::drawSprite(const SkDraw& d, const SkBitmap& bitmap,
int x, int y, const SkPaint& paint) {
if (d.fClip->isEmpty()) {
return;
}
SkMatrix matrix;
matrix.setTranslate(SkIntToScalar(x), SkIntToScalar(y));
internalDrawBitmap(matrix, d.fClipStack, *d.fClip, bitmap, NULL, paint);
}
void SkPDFDevice::drawText(const SkDraw& d, const void* text, size_t len,
SkScalar x, SkScalar y, const SkPaint& paint) {
SkPaint textPaint = calculate_text_paint(paint);
ScopedContentEntry content(this, d, textPaint, true);
if (!content.entry()) {
return;
}
// We want the text in glyph id encoding and a writable buffer, so we end
// up making a copy either way.
size_t numGlyphs = paint.textToGlyphs(text, len, NULL);
uint16_t* glyphIDs =
(uint16_t*)sk_malloc_flags(numGlyphs * 2,
SK_MALLOC_TEMP | SK_MALLOC_THROW);
SkAutoFree autoFreeGlyphIDs(glyphIDs);
if (paint.getTextEncoding() != SkPaint::kGlyphID_TextEncoding) {
paint.textToGlyphs(text, len, glyphIDs);
textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
} else {
SkASSERT((len & 1) == 0);
SkASSERT(len / 2 == numGlyphs);
memcpy(glyphIDs, text, len);
}
SkScalar width;
SkScalar* widthPtr = NULL;
if (textPaint.isUnderlineText() || textPaint.isStrikeThruText())
widthPtr = &width;
SkDrawCacheProc glyphCacheProc = textPaint.getDrawCacheProc();
align_text(glyphCacheProc, textPaint, glyphIDs, numGlyphs, &x, &y,
widthPtr);
content.entry()->fContent.writeText("BT\n");
set_text_transform(x, y, textPaint.getTextSkewX(),
&content.entry()->fContent);
size_t consumedGlyphCount = 0;
while (numGlyphs > consumedGlyphCount) {
updateFont(textPaint, glyphIDs[consumedGlyphCount], content.entry());
SkPDFFont* font = content.entry()->fState.fFont;
size_t availableGlyphs =
font->glyphsToPDFFontEncoding(glyphIDs + consumedGlyphCount,
numGlyphs - consumedGlyphCount);
fFontGlyphUsage->noteGlyphUsage(font, glyphIDs + consumedGlyphCount,
availableGlyphs);
SkString encodedString =
SkPDFString::FormatString(glyphIDs + consumedGlyphCount,
availableGlyphs, font->multiByteGlyphs());
content.entry()->fContent.writeText(encodedString.c_str());
consumedGlyphCount += availableGlyphs;
content.entry()->fContent.writeText(" Tj\n");
}
content.entry()->fContent.writeText("ET\n");
// Draw underline and/or strikethrough if the paint has them.
// drawPosText() and drawTextOnPath() don't draw underline or strikethrough
// because the raster versions don't. Use paint instead of textPaint
// because we may have changed strokeWidth to do fakeBold text.
if (paint.isUnderlineText() || paint.isStrikeThruText()) {
SkScalar textSize = paint.getTextSize();
SkScalar height = SkScalarMul(textSize, kStdUnderline_Thickness);
if (paint.isUnderlineText()) {
SkScalar top = SkScalarMulAdd(textSize, kStdUnderline_Offset, y);
SkRect r = SkRect::MakeXYWH(x, top - height, width, height);
drawRect(d, r, paint);
}
if (paint.isStrikeThruText()) {
SkScalar top = SkScalarMulAdd(textSize, kStdStrikeThru_Offset, y);
SkRect r = SkRect::MakeXYWH(x, top - height, width, height);
drawRect(d, r, paint);
}
}
}
void SkPDFDevice::drawPosText(const SkDraw& d, const void* text, size_t len,
const SkScalar pos[], SkScalar constY,
int scalarsPerPos, const SkPaint& paint) {
SkASSERT(1 == scalarsPerPos || 2 == scalarsPerPos);
SkPaint textPaint = calculate_text_paint(paint);
ScopedContentEntry content(this, d, textPaint, true);
if (!content.entry()) {
return;
}
// Make sure we have a glyph id encoding.
SkAutoFree glyphStorage;
uint16_t* glyphIDs;
size_t numGlyphs;
if (paint.getTextEncoding() != SkPaint::kGlyphID_TextEncoding) {
numGlyphs = paint.textToGlyphs(text, len, NULL);
glyphIDs = (uint16_t*)sk_malloc_flags(numGlyphs * 2,
SK_MALLOC_TEMP | SK_MALLOC_THROW);
glyphStorage.set(glyphIDs);
paint.textToGlyphs(text, len, glyphIDs);
textPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
} else {
SkASSERT((len & 1) == 0);
numGlyphs = len / 2;
glyphIDs = (uint16_t*)text;
}
SkDrawCacheProc glyphCacheProc = textPaint.getDrawCacheProc();
content.entry()->fContent.writeText("BT\n");
updateFont(textPaint, glyphIDs[0], content.entry());
for (size_t i = 0; i < numGlyphs; i++) {
SkPDFFont* font = content.entry()->fState.fFont;
uint16_t encodedValue = glyphIDs[i];
if (font->glyphsToPDFFontEncoding(&encodedValue, 1) != 1) {
updateFont(textPaint, glyphIDs[i], content.entry());
i--;
continue;
}
fFontGlyphUsage->noteGlyphUsage(font, &encodedValue, 1);
SkScalar x = pos[i * scalarsPerPos];
SkScalar y = scalarsPerPos == 1 ? constY : pos[i * scalarsPerPos + 1];
align_text(glyphCacheProc, textPaint, glyphIDs + i, 1, &x, &y, NULL);
set_text_transform(x, y, textPaint.getTextSkewX(),
&content.entry()->fContent);
SkString encodedString =
SkPDFString::FormatString(&encodedValue, 1,
font->multiByteGlyphs());
content.entry()->fContent.writeText(encodedString.c_str());
content.entry()->fContent.writeText(" Tj\n");
}
content.entry()->fContent.writeText("ET\n");
}
void SkPDFDevice::drawTextOnPath(const SkDraw& d, const void* text, size_t len,
const SkPath& path, const SkMatrix* matrix,
const SkPaint& paint) {
if (d.fClip->isEmpty()) {
return;
}
NOT_IMPLEMENTED("drawTextOnPath", false);
}
void SkPDFDevice::drawVertices(const SkDraw& d, SkCanvas::VertexMode,
int vertexCount, const SkPoint verts[],
const SkPoint texs[], const SkColor colors[],
SkXfermode* xmode, const uint16_t indices[],
int indexCount, const SkPaint& paint) {
if (d.fClip->isEmpty()) {
return;
}
NOT_IMPLEMENTED("drawVerticies", true);
}
void SkPDFDevice::drawDevice(const SkDraw& d, SkDevice* device, int x, int y,
const SkPaint& paint) {
if ((device->getDeviceCapabilities() & kVector_Capability) == 0) {
// If we somehow get a raster device, do what our parent would do.
SkDevice::drawDevice(d, device, x, y, paint);
return;
}
// Assume that a vector capable device means that it's a PDF Device.
SkPDFDevice* pdfDevice = static_cast<SkPDFDevice*>(device);
if (pdfDevice->isContentEmpty()) {
return;
}
SkMatrix matrix;
matrix.setTranslate(SkIntToScalar(x), SkIntToScalar(y));
ScopedContentEntry content(this, d.fClipStack, *d.fClip, matrix, paint);
if (!content.entry()) {
return;
}
SkPDFFormXObject* xobject = new SkPDFFormXObject(pdfDevice);
fXObjectResources.push(xobject); // Transfer reference.
SkPDFUtils::DrawFormXObject(fXObjectResources.count() - 1,
&content.entry()->fContent);
// Merge glyph sets from the drawn device.
fFontGlyphUsage->merge(pdfDevice->getFontGlyphUsage());
}
ContentEntry* SkPDFDevice::getLastContentEntry() {
if (fDrawingArea == kContent_DrawingArea) {
return fLastContentEntry;
} else {
return fLastMarginContentEntry;
}
}
SkTScopedPtr<ContentEntry>& SkPDFDevice::getContentEntries() {
if (fDrawingArea == kContent_DrawingArea) {
return fContentEntries;
} else {
return fMarginContentEntries;
}
}
void SkPDFDevice::setLastContentEntry(ContentEntry* contentEntry) {
if (fDrawingArea == kContent_DrawingArea) {
fLastContentEntry = contentEntry;
} else {
fLastMarginContentEntry = contentEntry;
}
}
void SkPDFDevice::setDrawingArea(DrawingArea drawingArea) {
// TODO(ctguil): Verify this isn't called when a ScopedContentEntry exists.
fDrawingArea = drawingArea;
}
SkPDFDict* SkPDFDevice::getResourceDict() {
if (fResourceDict.get() == NULL) {
fResourceDict = new SkPDFDict;
fResourceDict->unref(); // SkRefPtr and new both took a reference.
if (fGraphicStateResources.count()) {
SkRefPtr<SkPDFDict> extGState = new SkPDFDict();
extGState->unref(); // SkRefPtr and new both took a reference.
for (int i = 0; i < fGraphicStateResources.count(); i++) {
SkString nameString("G");
nameString.appendS32(i);
extGState->insert(
nameString.c_str(),
new SkPDFObjRef(fGraphicStateResources[i]))->unref();
}
fResourceDict->insert("ExtGState", extGState.get());
}
if (fXObjectResources.count()) {
SkRefPtr<SkPDFDict> xObjects = new SkPDFDict();
xObjects->unref(); // SkRefPtr and new both took a reference.
for (int i = 0; i < fXObjectResources.count(); i++) {
SkString nameString("X");
nameString.appendS32(i);
xObjects->insert(
nameString.c_str(),
new SkPDFObjRef(fXObjectResources[i]))->unref();
}
fResourceDict->insert("XObject", xObjects.get());
}
if (fFontResources.count()) {
SkRefPtr<SkPDFDict> fonts = new SkPDFDict();
fonts->unref(); // SkRefPtr and new both took a reference.
for (int i = 0; i < fFontResources.count(); i++) {
SkString nameString("F");
nameString.appendS32(i);
fonts->insert(nameString.c_str(),
new SkPDFObjRef(fFontResources[i]))->unref();
}
fResourceDict->insert("Font", fonts.get());
}
if (fShaderResources.count()) {
SkRefPtr<SkPDFDict> patterns = new SkPDFDict();
patterns->unref(); // SkRefPtr and new both took a reference.
for (int i = 0; i < fShaderResources.count(); i++) {
SkString nameString("P");
nameString.appendS32(i);
patterns->insert(nameString.c_str(),
new SkPDFObjRef(fShaderResources[i]))->unref();
}
fResourceDict->insert("Pattern", patterns.get());
}
// For compatibility, add all proc sets (only used for output to PS
// devices).
const char procs[][7] = {"PDF", "Text", "ImageB", "ImageC", "ImageI"};
SkRefPtr<SkPDFArray> procSets = new SkPDFArray();
procSets->unref(); // SkRefPtr and new both took a reference.
procSets->reserve(SK_ARRAY_COUNT(procs));
for (size_t i = 0; i < SK_ARRAY_COUNT(procs); i++)
procSets->appendName(procs[i]);
fResourceDict->insert("ProcSet", procSets.get());
}
return fResourceDict.get();
}
void SkPDFDevice::getResources(SkTDArray<SkPDFObject*>* resourceList) const {
resourceList->setReserve(resourceList->count() +
fGraphicStateResources.count() +
fXObjectResources.count() +
fFontResources.count() +
fShaderResources.count());
for (int i = 0; i < fGraphicStateResources.count(); i++) {
resourceList->push(fGraphicStateResources[i]);
fGraphicStateResources[i]->ref();
fGraphicStateResources[i]->getResources(resourceList);
}
for (int i = 0; i < fXObjectResources.count(); i++) {
resourceList->push(fXObjectResources[i]);
fXObjectResources[i]->ref();
fXObjectResources[i]->getResources(resourceList);
}
for (int i = 0; i < fFontResources.count(); i++) {
resourceList->push(fFontResources[i]);
fFontResources[i]->ref();
fFontResources[i]->getResources(resourceList);
}
for (int i = 0; i < fShaderResources.count(); i++) {
resourceList->push(fShaderResources[i]);
fShaderResources[i]->ref();
fShaderResources[i]->getResources(resourceList);
}
}
const SkTDArray<SkPDFFont*>& SkPDFDevice::getFontResources() const {
return fFontResources;
}
SkRefPtr<SkPDFArray> SkPDFDevice::getMediaBox() const {
SkRefPtr<SkPDFInt> zero = new SkPDFInt(0);
zero->unref(); // SkRefPtr and new both took a reference.
SkRefPtr<SkPDFArray> mediaBox = new SkPDFArray();
mediaBox->unref(); // SkRefPtr and new both took a reference.
mediaBox->reserve(4);
mediaBox->append(zero.get());
mediaBox->append(zero.get());
mediaBox->appendInt(fPageSize.fWidth);
mediaBox->appendInt(fPageSize.fHeight);
return mediaBox;
}
SkStream* SkPDFDevice::content() const {
SkMemoryStream* result = new SkMemoryStream;
result->setData(this->copyContentToData())->unref();
return result;
}
void SkPDFDevice::copyContentEntriesToData(ContentEntry* entry,
SkWStream* data) const {
GraphicStackState gsState(fExistingClipStack, fExistingClipRegion, data);
while(entry != NULL) {
SkIPoint translation = this->getOrigin();
translation.negate();
gsState.updateClip(entry->fState.fClipStack, entry->fState.fClipRegion,
translation);
gsState.updateMatrix(entry->fState.fMatrix);
gsState.updateDrawingState(entry->fState);
SkAutoDataUnref copy(entry->fContent.copyToData());
data->write(copy.data(), copy.size());
entry = entry->fNext.get();
}
gsState.drainStack();
}
SkData* SkPDFDevice::copyContentToData() const {
SkDynamicMemoryWStream data;
if (fInitialTransform.getType() != SkMatrix::kIdentity_Mask) {
SkPDFUtils::AppendTransform(fInitialTransform, &data);
}
// TODO(aayushkumar): Apply clip along the margins. Currently, webkit
// colors the contentArea white before it starts drawing into it and
// that currently acts as our clip.
// Also, think about adding a transform here (or assume that the values
// sent across account for that)
SkPDFDevice::copyContentEntriesToData(fMarginContentEntries.get(), &data);
// If the content area is the entire page, then we don't need to clip
// the content area (PDF area clips to the page size). Otherwise,
// we have to clip to the content area; we've already applied the
// initial transform, so just clip to the device size.
if (fPageSize != fContentSize) {
SkRect r = SkRect::MakeWH(this->width(), this->height());
emit_clip(NULL, &r, &data);
}
SkPDFDevice::copyContentEntriesToData(fContentEntries.get(), &data);
// potentially we could cache this SkData, and only rebuild it if we
// see that our state has changed.
return data.copyToData();
}
void SkPDFDevice::createFormXObjectFromDevice(
SkRefPtr<SkPDFFormXObject>* xobject) {
*xobject = new SkPDFFormXObject(this);
(*xobject)->unref(); // SkRefPtr and new both took a reference.
// 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.
cleanUp(false); // Reset this device to have no content.
init();
}
void SkPDFDevice::clearClipFromContent(const SkClipStack* clipStack,
const SkRegion& clipRegion) {
if (clipRegion.isEmpty() || isContentEmpty()) {
return;
}
SkRefPtr<SkPDFFormXObject> curContent;
createFormXObjectFromDevice(&curContent);
// Redraw what we already had, but with the clip as a mask.
drawFormXObjectWithClip(curContent.get(), clipStack, clipRegion, true);
}
void SkPDFDevice::drawFormXObjectWithClip(SkPDFFormXObject* xobject,
const SkClipStack* clipStack,
const SkRegion& clipRegion,
bool invertClip) {
if (clipRegion.isEmpty() && !invertClip) {
return;
}
// Create the mask.
SkMatrix identity;
identity.reset();
SkDraw draw;
draw.fMatrix = &identity;
draw.fClip = &clipRegion;
draw.fClipStack = clipStack;
SkPaint stockPaint;
this->drawPaint(draw, stockPaint);
SkRefPtr<SkPDFFormXObject> maskFormXObject;
createFormXObjectFromDevice(&maskFormXObject);
SkRefPtr<SkPDFGraphicState> sMaskGS =
SkPDFGraphicState::GetSMaskGraphicState(maskFormXObject.get(),
invertClip);
sMaskGS->unref(); // SkRefPtr and getSMaskGraphicState both took a ref.
// Draw the xobject with the clip as a mask.
ScopedContentEntry content(this, &fExistingClipStack, fExistingClipRegion,
identity, stockPaint);
if (!content.entry()) {
return;
}
SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
&content.entry()->fContent);
SkPDFUtils::DrawFormXObject(fXObjectResources.count(),
&content.entry()->fContent);
fXObjectResources.push(xobject);
xobject->ref();
sMaskGS = SkPDFGraphicState::GetNoSMaskGraphicState();
sMaskGS->unref(); // SkRefPtr and getSMaskGraphicState both took a ref.
SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
&content.entry()->fContent);
}
ContentEntry* SkPDFDevice::setUpContentEntry(const SkClipStack* clipStack,
const SkRegion& clipRegion,
const SkMatrix& matrix,
const SkPaint& paint,
bool hasText,
SkRefPtr<SkPDFFormXObject>* dst) {
if (clipRegion.isEmpty()) {
return NULL;
}
// The clip stack can come from an SkDraw where it is technically optional.
SkClipStack synthesizedClipStack;
if (clipStack == NULL) {
if (clipRegion == fExistingClipRegion) {
clipStack = &fExistingClipStack;
} else {
// GraphicStackState::updateClip expects the clip stack to have
// fExistingClip as a prefix, so start there, then set the clip
// to the passed region.
synthesizedClipStack = fExistingClipStack;
SkPath clipPath;
clipRegion.getBoundaryPath(&clipPath);
synthesizedClipStack.clipDevPath(clipPath, SkRegion::kReplace_Op);
clipStack = &synthesizedClipStack;
}
}
SkXfermode::Mode xfermode = SkXfermode::kSrcOver_Mode;
if (paint.getXfermode()) {
paint.getXfermode()->asMode(&xfermode);
}
if (xfermode == SkXfermode::kClear_Mode ||
xfermode == SkXfermode::kSrc_Mode) {
this->clearClipFromContent(clipStack, clipRegion);
} else if (xfermode == SkXfermode::kSrcIn_Mode ||
xfermode == SkXfermode::kDstIn_Mode ||
xfermode == SkXfermode::kSrcOut_Mode ||
xfermode == SkXfermode::kDstOut_Mode) {
// For the following modes, we use both source and destination, but
// we use one as a smask for the other, so we have to make form xobjects
// out of both of them: SrcIn, DstIn, SrcOut, DstOut.
if (isContentEmpty()) {
return NULL;
} else {
createFormXObjectFromDevice(dst);
}
}
// TODO(vandebo) Figure out how/if we can handle the following modes:
// SrcAtop, DestAtop, Xor, Plus.
// These xfer modes don't draw source at all.
if (xfermode == SkXfermode::kClear_Mode ||
xfermode == SkXfermode::kDst_Mode) {
return NULL;
}
ContentEntry* entry;
SkTScopedPtr<ContentEntry> newEntry;
ContentEntry* lastContentEntry = getLastContentEntry();
if (lastContentEntry && lastContentEntry->fContent.getOffset() == 0) {
entry = lastContentEntry;
} else {
newEntry.reset(new ContentEntry);
entry = newEntry.get();
}
populateGraphicStateEntryFromPaint(matrix, *clipStack, clipRegion, paint,
hasText, &entry->fState);
if (lastContentEntry && xfermode != SkXfermode::kDstOver_Mode &&
entry->fState.compareInitialState(lastContentEntry->fState)) {
return lastContentEntry;
}
SkTScopedPtr<ContentEntry>& contentEntries = getContentEntries();
if (!lastContentEntry) {
contentEntries.reset(entry);
setLastContentEntry(entry);
} else if (xfermode == SkXfermode::kDstOver_Mode) {
entry->fNext.reset(contentEntries.release());
contentEntries.reset(entry);
} else {
lastContentEntry->fNext.reset(entry);
setLastContentEntry(entry);
}
newEntry.release();
return entry;
}
void SkPDFDevice::finishContentEntry(const SkXfermode::Mode xfermode,
SkPDFFormXObject* dst) {
if (xfermode != SkXfermode::kSrcIn_Mode &&
xfermode != SkXfermode::kDstIn_Mode &&
xfermode != SkXfermode::kSrcOut_Mode &&
xfermode != SkXfermode::kDstOut_Mode) {
SkASSERT(!dst);
return;
}
SkTScopedPtr<ContentEntry>& contentEntries = getContentEntries();
SkASSERT(dst);
SkASSERT(!contentEntries->fNext.get());
// We have to make a copy of these here because changing the current
// content into a form xobject will destroy them.
SkClipStack clipStack = contentEntries->fState.fClipStack;
SkRegion clipRegion = contentEntries->fState.fClipRegion;
SkRefPtr<SkPDFFormXObject> srcFormXObject;
if (!isContentEmpty()) {
createFormXObjectFromDevice(&srcFormXObject);
}
drawFormXObjectWithClip(dst, &clipStack, clipRegion, true);
// We've redrawn dst minus the clip area, if there's no src, we're done.
if (!srcFormXObject.get()) {
return;
}
SkMatrix identity;
identity.reset();
SkPaint stockPaint;
ScopedContentEntry inClipContentEntry(this, &fExistingClipStack,
fExistingClipRegion, identity,
stockPaint);
if (!inClipContentEntry.entry()) {
return;
}
SkRefPtr<SkPDFGraphicState> sMaskGS;
if (xfermode == SkXfermode::kSrcIn_Mode ||
xfermode == SkXfermode::kSrcOut_Mode) {
sMaskGS = SkPDFGraphicState::GetSMaskGraphicState(
dst, xfermode == SkXfermode::kSrcOut_Mode);
fXObjectResources.push(srcFormXObject.get());
srcFormXObject->ref();
} else {
sMaskGS = SkPDFGraphicState::GetSMaskGraphicState(
srcFormXObject.get(), xfermode == SkXfermode::kDstOut_Mode);
// dst already added to fXObjectResources in drawFormXObjectWithClip.
}
sMaskGS->unref(); // SkRefPtr and getSMaskGraphicState both took a ref.
SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
&inClipContentEntry.entry()->fContent);
SkPDFUtils::DrawFormXObject(fXObjectResources.count() - 1,
&inClipContentEntry.entry()->fContent);
sMaskGS = SkPDFGraphicState::GetNoSMaskGraphicState();
sMaskGS->unref(); // SkRefPtr and getSMaskGraphicState both took a ref.
SkPDFUtils::ApplyGraphicState(addGraphicStateResource(sMaskGS.get()),
&inClipContentEntry.entry()->fContent);
}
bool SkPDFDevice::isContentEmpty() {
SkTScopedPtr<ContentEntry>& contentEntries = getContentEntries();
if (!contentEntries.get() || contentEntries->fContent.getOffset() == 0) {
SkASSERT(!contentEntries.get() || !contentEntries->fNext.get());
return true;
}
return false;
}
void SkPDFDevice::populateGraphicStateEntryFromPaint(
const SkMatrix& matrix,
const SkClipStack& clipStack,
const SkRegion& clipRegion,
const SkPaint& paint,
bool hasText,
GraphicStateEntry* entry) {
SkASSERT(paint.getPathEffect() == NULL);
NOT_IMPLEMENTED(paint.getMaskFilter() != NULL, false);
NOT_IMPLEMENTED(paint.getColorFilter() != NULL, false);
entry->fMatrix = matrix;
entry->fClipStack = clipStack;
entry->fClipRegion = clipRegion;
// PDF treats a shader as a color, so we only set one or the other.
SkRefPtr<SkPDFObject> pdfShader;
const SkShader* shader = paint.getShader();
SkColor color = paint.getColor();
if (shader) {
// 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(fInitialTransform);
// PDF doesn't support kClamp_TileMode, so we simulate it by making
// a pattern the size of the current clip.
SkIRect bounds = clipRegion.getBounds();
pdfShader = SkPDFShader::GetPDFShader(*shader, transform, bounds);
SkSafeUnref(pdfShader.get()); // getShader and SkRefPtr both took a ref
if (pdfShader.get()) {
// pdfShader has been canonicalized so we can directly compare
// pointers.
int resourceIndex = fShaderResources.find(pdfShader.get());
if (resourceIndex < 0) {
resourceIndex = fShaderResources.count();
fShaderResources.push(pdfShader.get());
pdfShader->ref();
}
entry->fShaderIndex = resourceIndex;
} else {
// A color shader is treated as an invalid shader so we don't have
// to set a shader just for a color.
entry->fShaderIndex = -1;
entry->fColor = 0;
color = 0;
// Check for a color shader.
SkShader::GradientInfo gradientInfo;
SkColor gradientColor;
gradientInfo.fColors = &gradientColor;
gradientInfo.fColorOffsets = NULL;
gradientInfo.fColorCount = 1;
if (shader->asAGradient(&gradientInfo) ==
SkShader::kColor_GradientType) {
entry->fColor = SkColorSetA(gradientColor, 0xFF);
color = gradientColor;
}
}
} else {
entry->fShaderIndex = -1;
entry->fColor = SkColorSetA(paint.getColor(), 0xFF);
color = paint.getColor();
}
SkRefPtr<SkPDFGraphicState> newGraphicState;
if (color == paint.getColor()) {
newGraphicState = SkPDFGraphicState::GetGraphicStateForPaint(paint);
} else {
SkPaint newPaint = paint;
newPaint.setColor(color);
newGraphicState = SkPDFGraphicState::GetGraphicStateForPaint(newPaint);
}
newGraphicState->unref(); // getGraphicState and SkRefPtr both took a ref.
int resourceIndex = addGraphicStateResource(newGraphicState.get());
entry->fGraphicStateIndex = resourceIndex;
if (hasText) {
entry->fTextScaleX = paint.getTextScaleX();
entry->fTextFill = paint.getStyle();
} else {
entry->fTextScaleX = 0;
}
}
int SkPDFDevice::addGraphicStateResource(SkPDFGraphicState* gs) {
// Assumes that gs has been canonicalized (so we can directly compare
// pointers).
int result = fGraphicStateResources.find(gs);
if (result < 0) {
result = fGraphicStateResources.count();
fGraphicStateResources.push(gs);
gs->ref();
}
return result;
}
void SkPDFDevice::updateFont(const SkPaint& paint, uint16_t glyphID,
ContentEntry* contentEntry) {
SkTypeface* typeface = paint.getTypeface();
if (contentEntry->fState.fFont == NULL ||
contentEntry->fState.fTextSize != paint.getTextSize() ||
!contentEntry->fState.fFont->hasGlyph(glyphID)) {
int fontIndex = getFontResourceIndex(typeface, glyphID);
contentEntry->fContent.writeText("/F");
contentEntry->fContent.writeDecAsText(fontIndex);
contentEntry->fContent.writeText(" ");
SkPDFScalar::Append(paint.getTextSize(), &contentEntry->fContent);
contentEntry->fContent.writeText(" Tf\n");
contentEntry->fState.fFont = fFontResources[fontIndex];
}
}
int SkPDFDevice::getFontResourceIndex(SkTypeface* typeface, uint16_t glyphID) {
SkRefPtr<SkPDFFont> newFont = SkPDFFont::GetFontResource(typeface, glyphID);
newFont->unref(); // getFontResource and SkRefPtr both took a ref.
int resourceIndex = fFontResources.find(newFont.get());
if (resourceIndex < 0) {
resourceIndex = fFontResources.count();
fFontResources.push(newFont.get());
newFont->ref();
}
return resourceIndex;
}
void SkPDFDevice::internalDrawBitmap(const SkMatrix& matrix,
const SkClipStack* clipStack,
const SkRegion& clipRegion,
const SkBitmap& bitmap,
const SkIRect* srcRect,
const SkPaint& paint) {
SkMatrix scaled;
// Adjust for origin flip.
scaled.setScale(1, -1);
scaled.postTranslate(0, 1);
// Scale the image up from 1x1 to WxH.
SkIRect subset = SkIRect::MakeWH(bitmap.width(), bitmap.height());
scaled.postScale(SkIntToScalar(subset.width()),
SkIntToScalar(subset.height()));
scaled.postConcat(matrix);
ScopedContentEntry content(this, clipStack, clipRegion, scaled, paint);
if (!content.entry()) {
return;
}
if (srcRect && !subset.intersect(*srcRect)) {
return;
}
SkPDFImage* image = SkPDFImage::CreateImage(bitmap, subset, paint);
if (!image) {
return;
}
fXObjectResources.push(image); // Transfer reference.
SkPDFUtils::DrawFormXObject(fXObjectResources.count() - 1,
&content.entry()->fContent);
}