diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/pdf/SkPDFUtils.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gfx/skia/trunk/src/pdf/SkPDFUtils.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,249 @@ + +/* + * 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 "SkPDFResourceDict.h" +#include "SkPDFUtils.h" +#include "SkStream.h" +#include "SkString.h" +#include "SkPDFTypes.h" + +//static +SkPDFArray* SkPDFUtils::RectToArray(const SkRect& rect) { + SkPDFArray* result = new SkPDFArray(); + result->reserve(4); + result->appendScalar(rect.fLeft); + result->appendScalar(rect.fTop); + result->appendScalar(rect.fRight); + result->appendScalar(rect.fBottom); + return result; +} + +// 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 = SkPoint::Make(0,0); + 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("/"); + content->writeText(SkPDFResourceDict::getResourceName( + SkPDFResourceDict::kXObject_ResourceType, + objectIndex).c_str()); + content->writeText(" Do\n"); +} + +// static +void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) { + content->writeText("/"); + content->writeText(SkPDFResourceDict::getResourceName( + SkPDFResourceDict::kExtGState_ResourceType, + objectIndex).c_str()); + content->writeText(" gs\n"); +} + +// static +void SkPDFUtils::ApplyPattern(int objectIndex, SkWStream* content) { + // Select Pattern color space (CS, cs) and set pattern object as current + // color (SCN, scn) + SkString resourceName = SkPDFResourceDict::getResourceName( + SkPDFResourceDict::kPattern_ResourceType, + objectIndex); + content->writeText("/Pattern CS/Pattern cs/"); + content->writeText(resourceName.c_str()); + content->writeText(" SCN/"); + content->writeText(resourceName.c_str()); + content->writeText(" scn\n"); +}