1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/pdf/SkPDFUtils.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,249 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2011 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkData.h"
1.14 +#include "SkGeometry.h"
1.15 +#include "SkPaint.h"
1.16 +#include "SkPath.h"
1.17 +#include "SkPDFResourceDict.h"
1.18 +#include "SkPDFUtils.h"
1.19 +#include "SkStream.h"
1.20 +#include "SkString.h"
1.21 +#include "SkPDFTypes.h"
1.22 +
1.23 +//static
1.24 +SkPDFArray* SkPDFUtils::RectToArray(const SkRect& rect) {
1.25 + SkPDFArray* result = new SkPDFArray();
1.26 + result->reserve(4);
1.27 + result->appendScalar(rect.fLeft);
1.28 + result->appendScalar(rect.fTop);
1.29 + result->appendScalar(rect.fRight);
1.30 + result->appendScalar(rect.fBottom);
1.31 + return result;
1.32 +}
1.33 +
1.34 +// static
1.35 +SkPDFArray* SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
1.36 + SkScalar values[6];
1.37 + if (!matrix.asAffine(values)) {
1.38 + SkMatrix::SetAffineIdentity(values);
1.39 + }
1.40 +
1.41 + SkPDFArray* result = new SkPDFArray;
1.42 + result->reserve(6);
1.43 + for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
1.44 + result->appendScalar(values[i]);
1.45 + }
1.46 + return result;
1.47 +}
1.48 +
1.49 +// static
1.50 +void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
1.51 + SkScalar values[6];
1.52 + if (!matrix.asAffine(values)) {
1.53 + SkMatrix::SetAffineIdentity(values);
1.54 + }
1.55 + for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
1.56 + SkPDFScalar::Append(values[i], content);
1.57 + content->writeText(" ");
1.58 + }
1.59 + content->writeText("cm\n");
1.60 +}
1.61 +
1.62 +// static
1.63 +void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
1.64 + SkPDFScalar::Append(x, content);
1.65 + content->writeText(" ");
1.66 + SkPDFScalar::Append(y, content);
1.67 + content->writeText(" m\n");
1.68 +}
1.69 +
1.70 +// static
1.71 +void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
1.72 + SkPDFScalar::Append(x, content);
1.73 + content->writeText(" ");
1.74 + SkPDFScalar::Append(y, content);
1.75 + content->writeText(" l\n");
1.76 +}
1.77 +
1.78 +// static
1.79 +void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
1.80 + SkScalar ctl2X, SkScalar ctl2Y,
1.81 + SkScalar dstX, SkScalar dstY, SkWStream* content) {
1.82 + SkString cmd("y\n");
1.83 + SkPDFScalar::Append(ctl1X, content);
1.84 + content->writeText(" ");
1.85 + SkPDFScalar::Append(ctl1Y, content);
1.86 + content->writeText(" ");
1.87 + if (ctl2X != dstX || ctl2Y != dstY) {
1.88 + cmd.set("c\n");
1.89 + SkPDFScalar::Append(ctl2X, content);
1.90 + content->writeText(" ");
1.91 + SkPDFScalar::Append(ctl2Y, content);
1.92 + content->writeText(" ");
1.93 + }
1.94 + SkPDFScalar::Append(dstX, content);
1.95 + content->writeText(" ");
1.96 + SkPDFScalar::Append(dstY, content);
1.97 + content->writeText(" ");
1.98 + content->writeText(cmd.c_str());
1.99 +}
1.100 +
1.101 +// static
1.102 +void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
1.103 + // Skia has 0,0 at top left, pdf at bottom left. Do the right thing.
1.104 + SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);
1.105 +
1.106 + SkPDFScalar::Append(rect.fLeft, content);
1.107 + content->writeText(" ");
1.108 + SkPDFScalar::Append(bottom, content);
1.109 + content->writeText(" ");
1.110 + SkPDFScalar::Append(rect.width(), content);
1.111 + content->writeText(" ");
1.112 + SkPDFScalar::Append(rect.height(), content);
1.113 + content->writeText(" re\n");
1.114 +}
1.115 +
1.116 +// static
1.117 +void SkPDFUtils::EmitPath(const SkPath& path, SkPaint::Style paintStyle,
1.118 + SkWStream* content) {
1.119 + // Filling a path with no area results in a drawing in PDF renderers but
1.120 + // Chrome expects to be able to draw some such entities with no visible
1.121 + // result, so we detect those cases and discard the drawing for them.
1.122 + // Specifically: moveTo(X), lineTo(Y) and moveTo(X), lineTo(X), lineTo(Y).
1.123 + enum SkipFillState {
1.124 + kEmpty_SkipFillState = 0,
1.125 + kSingleLine_SkipFillState = 1,
1.126 + kNonSingleLine_SkipFillState = 2,
1.127 + };
1.128 + SkipFillState fillState = kEmpty_SkipFillState;
1.129 + if (paintStyle != SkPaint::kFill_Style) {
1.130 + fillState = kNonSingleLine_SkipFillState;
1.131 + }
1.132 + SkPoint lastMovePt = SkPoint::Make(0,0);
1.133 + SkDynamicMemoryWStream currentSegment;
1.134 + SkPoint args[4];
1.135 + SkPath::Iter iter(path, false);
1.136 + for (SkPath::Verb verb = iter.next(args);
1.137 + verb != SkPath::kDone_Verb;
1.138 + verb = iter.next(args)) {
1.139 + // args gets all the points, even the implicit first point.
1.140 + switch (verb) {
1.141 + case SkPath::kMove_Verb:
1.142 + MoveTo(args[0].fX, args[0].fY, ¤tSegment);
1.143 + lastMovePt = args[0];
1.144 + fillState = kEmpty_SkipFillState;
1.145 + break;
1.146 + case SkPath::kLine_Verb:
1.147 + AppendLine(args[1].fX, args[1].fY, ¤tSegment);
1.148 + if (fillState == kEmpty_SkipFillState) {
1.149 + if (args[0] != lastMovePt) {
1.150 + fillState = kSingleLine_SkipFillState;
1.151 + }
1.152 + } else if (fillState == kSingleLine_SkipFillState) {
1.153 + fillState = kNonSingleLine_SkipFillState;
1.154 + }
1.155 + break;
1.156 + case SkPath::kQuad_Verb: {
1.157 + SkPoint cubic[4];
1.158 + SkConvertQuadToCubic(args, cubic);
1.159 + AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
1.160 + cubic[3].fX, cubic[3].fY, ¤tSegment);
1.161 + fillState = kNonSingleLine_SkipFillState;
1.162 + break;
1.163 + }
1.164 + case SkPath::kCubic_Verb:
1.165 + AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
1.166 + args[3].fX, args[3].fY, ¤tSegment);
1.167 + fillState = kNonSingleLine_SkipFillState;
1.168 + break;
1.169 + case SkPath::kClose_Verb:
1.170 + if (fillState != kSingleLine_SkipFillState) {
1.171 + ClosePath(¤tSegment);
1.172 + SkData* data = currentSegment.copyToData();
1.173 + content->write(data->data(), data->size());
1.174 + data->unref();
1.175 + }
1.176 + currentSegment.reset();
1.177 + break;
1.178 + default:
1.179 + SkASSERT(false);
1.180 + break;
1.181 + }
1.182 + }
1.183 + if (currentSegment.bytesWritten() > 0) {
1.184 + SkData* data = currentSegment.copyToData();
1.185 + content->write(data->data(), data->size());
1.186 + data->unref();
1.187 + }
1.188 +}
1.189 +
1.190 +// static
1.191 +void SkPDFUtils::ClosePath(SkWStream* content) {
1.192 + content->writeText("h\n");
1.193 +}
1.194 +
1.195 +// static
1.196 +void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
1.197 + SkWStream* content) {
1.198 + if (style == SkPaint::kFill_Style) {
1.199 + content->writeText("f");
1.200 + } else if (style == SkPaint::kStrokeAndFill_Style) {
1.201 + content->writeText("B");
1.202 + } else if (style == SkPaint::kStroke_Style) {
1.203 + content->writeText("S");
1.204 + }
1.205 +
1.206 + if (style != SkPaint::kStroke_Style) {
1.207 + NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
1.208 + NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
1.209 + if (fill == SkPath::kEvenOdd_FillType) {
1.210 + content->writeText("*");
1.211 + }
1.212 + }
1.213 + content->writeText("\n");
1.214 +}
1.215 +
1.216 +// static
1.217 +void SkPDFUtils::StrokePath(SkWStream* content) {
1.218 + SkPDFUtils::PaintPath(
1.219 + SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
1.220 +}
1.221 +
1.222 +// static
1.223 +void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
1.224 + content->writeText("/");
1.225 + content->writeText(SkPDFResourceDict::getResourceName(
1.226 + SkPDFResourceDict::kXObject_ResourceType,
1.227 + objectIndex).c_str());
1.228 + content->writeText(" Do\n");
1.229 +}
1.230 +
1.231 +// static
1.232 +void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
1.233 + content->writeText("/");
1.234 + content->writeText(SkPDFResourceDict::getResourceName(
1.235 + SkPDFResourceDict::kExtGState_ResourceType,
1.236 + objectIndex).c_str());
1.237 + content->writeText(" gs\n");
1.238 +}
1.239 +
1.240 +// static
1.241 +void SkPDFUtils::ApplyPattern(int objectIndex, SkWStream* content) {
1.242 + // Select Pattern color space (CS, cs) and set pattern object as current
1.243 + // color (SCN, scn)
1.244 + SkString resourceName = SkPDFResourceDict::getResourceName(
1.245 + SkPDFResourceDict::kPattern_ResourceType,
1.246 + objectIndex);
1.247 + content->writeText("/Pattern CS/Pattern cs/");
1.248 + content->writeText(resourceName.c_str());
1.249 + content->writeText(" SCN/");
1.250 + content->writeText(resourceName.c_str());
1.251 + content->writeText(" scn\n");
1.252 +}
