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/*
* 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 "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];
SkAssertResult(matrix.pdfTransform(values));
SkPDFArray* result = new SkPDFArray;
result->reserve(6);
for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
result->append(new SkPDFScalar(values[i]))->unref();
}
return result;
}
// static
void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
SkScalar values[6];
SkAssertResult(matrix.pdfTransform(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(SkScalar x, SkScalar y,
SkScalar w, SkScalar h, SkWStream* content) {
SkPDFScalar::Append(x, content);
content->writeText(" ");
SkPDFScalar::Append(y, content);
content->writeText(" ");
SkPDFScalar::Append(w, content);
content->writeText(" ");
SkPDFScalar::Append(h, content);
content->writeText(" re\n");
}
// static
void SkPDFUtils::EmitPath(const SkPath& path, SkWStream* content) {
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, content);
break;
case SkPath::kLine_Verb:
AppendLine(args[1].fX, args[1].fY, content);
break;
case SkPath::kQuad_Verb: {
// Convert quad to cubic (degree elevation). http://goo.gl/vS4i
const SkScalar three = SkIntToScalar(3);
args[1].scale(SkIntToScalar(2));
SkScalar ctl1X = SkScalarDiv(args[0].fX + args[1].fX, three);
SkScalar ctl1Y = SkScalarDiv(args[0].fY + args[1].fY, three);
SkScalar ctl2X = SkScalarDiv(args[2].fX + args[1].fX, three);
SkScalar ctl2Y = SkScalarDiv(args[2].fY + args[1].fY, three);
AppendCubic(ctl1X, ctl1Y, ctl2X, ctl2Y, args[2].fX, args[2].fY,
content);
break;
}
case SkPath::kCubic_Verb:
AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
args[3].fX, args[3].fY, content);
break;
case SkPath::kClose_Verb:
ClosePath(content);
break;
case SkPath::kDone_Verb:
break;
default:
SkASSERT(false);
break;
}
}
}
// 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);
}
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