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/*
* 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 "SkData.h"
#include "SkGeometry.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPDFUtils.h"
#include "SkStream.h"
#include "SkString.h"
#include "SkPDFTypes.h"
// static
SkPDFArray* SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
SkScalar values[6];
if (!matrix.asAffine(values)) {
SkMatrix::SetAffineIdentity(values);
}
SkPDFArray* result = new SkPDFArray;
result->reserve(6);
for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
result->appendScalar(values[i]);
}
return result;
}
// static
void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
SkScalar values[6];
if (!matrix.asAffine(values)) {
SkMatrix::SetAffineIdentity(values);
}
for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
SkPDFScalar::Append(values[i], content);
content->writeText(" ");
}
content->writeText("cm\n");
}
// static
void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
SkPDFScalar::Append(x, content);
content->writeText(" ");
SkPDFScalar::Append(y, content);
content->writeText(" m\n");
}
// static
void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
SkPDFScalar::Append(x, content);
content->writeText(" ");
SkPDFScalar::Append(y, content);
content->writeText(" l\n");
}
// static
void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
SkScalar ctl2X, SkScalar ctl2Y,
SkScalar dstX, SkScalar dstY, SkWStream* content) {
SkString cmd("y\n");
SkPDFScalar::Append(ctl1X, content);
content->writeText(" ");
SkPDFScalar::Append(ctl1Y, content);
content->writeText(" ");
if (ctl2X != dstX || ctl2Y != dstY) {
cmd.set("c\n");
SkPDFScalar::Append(ctl2X, content);
content->writeText(" ");
SkPDFScalar::Append(ctl2Y, content);
content->writeText(" ");
}
SkPDFScalar::Append(dstX, content);
content->writeText(" ");
SkPDFScalar::Append(dstY, content);
content->writeText(" ");
content->writeText(cmd.c_str());
}
// static
void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
// Skia has 0,0 at top left, pdf at bottom left. Do the right thing.
SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);
SkPDFScalar::Append(rect.fLeft, content);
content->writeText(" ");
SkPDFScalar::Append(bottom, content);
content->writeText(" ");
SkPDFScalar::Append(rect.width(), content);
content->writeText(" ");
SkPDFScalar::Append(rect.height(), content);
content->writeText(" re\n");
}
// static
void SkPDFUtils::EmitPath(const SkPath& path, SkPaint::Style paintStyle,
SkWStream* content) {
// Filling a path with no area results in a drawing in PDF renderers but
// Chrome expects to be able to draw some such entities with no visible
// result, so we detect those cases and discard the drawing for them.
// Specifically: moveTo(X), lineTo(Y) and moveTo(X), lineTo(X), lineTo(Y).
enum SkipFillState {
kEmpty_SkipFillState = 0,
kSingleLine_SkipFillState = 1,
kNonSingleLine_SkipFillState = 2,
};
SkipFillState fillState = kEmpty_SkipFillState;
if (paintStyle != SkPaint::kFill_Style) {
fillState = kNonSingleLine_SkipFillState;
}
SkPoint lastMovePt;
SkDynamicMemoryWStream currentSegment;
SkPoint args[4];
SkPath::Iter iter(path, false);
for (SkPath::Verb verb = iter.next(args);
verb != SkPath::kDone_Verb;
verb = iter.next(args)) {
// args gets all the points, even the implicit first point.
switch (verb) {
case SkPath::kMove_Verb:
MoveTo(args[0].fX, args[0].fY, ¤tSegment);
lastMovePt = args[0];
fillState = kEmpty_SkipFillState;
break;
case SkPath::kLine_Verb:
AppendLine(args[1].fX, args[1].fY, ¤tSegment);
if (fillState == kEmpty_SkipFillState) {
if (args[0] != lastMovePt) {
fillState = kSingleLine_SkipFillState;
}
} else if (fillState == kSingleLine_SkipFillState) {
fillState = kNonSingleLine_SkipFillState;
}
break;
case SkPath::kQuad_Verb: {
SkPoint cubic[4];
SkConvertQuadToCubic(args, cubic);
AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
cubic[3].fX, cubic[3].fY, ¤tSegment);
fillState = kNonSingleLine_SkipFillState;
break;
}
case SkPath::kCubic_Verb:
AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
args[3].fX, args[3].fY, ¤tSegment);
fillState = kNonSingleLine_SkipFillState;
break;
case SkPath::kClose_Verb:
if (fillState != kSingleLine_SkipFillState) {
ClosePath(¤tSegment);
SkData* data = currentSegment.copyToData();
content->write(data->data(), data->size());
data->unref();
}
currentSegment.reset();
break;
default:
SkASSERT(false);
break;
}
}
if (currentSegment.bytesWritten() > 0) {
SkData* data = currentSegment.copyToData();
content->write(data->data(), data->size());
data->unref();
}
}
// static
void SkPDFUtils::ClosePath(SkWStream* content) {
content->writeText("h\n");
}
// static
void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
SkWStream* content) {
if (style == SkPaint::kFill_Style) {
content->writeText("f");
} else if (style == SkPaint::kStrokeAndFill_Style) {
content->writeText("B");
} else if (style == SkPaint::kStroke_Style) {
content->writeText("S");
}
if (style != SkPaint::kStroke_Style) {
NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
if (fill == SkPath::kEvenOdd_FillType) {
content->writeText("*");
}
}
content->writeText("\n");
}
// static
void SkPDFUtils::StrokePath(SkWStream* content) {
SkPDFUtils::PaintPath(
SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
}
// static
void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
content->writeText("/X");
content->writeDecAsText(objectIndex);
content->writeText(" Do\n");
}
// static
void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
content->writeText("/G");
content->writeDecAsText(objectIndex);
content->writeText(" gs\n");
}
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