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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #include "SkGeometry.h"
     11 #include "SkPaint.h"
     12 #include "SkPath.h"
     13 #include "SkPDFUtils.h"
     14 #include "SkStream.h"
     15 #include "SkString.h"
     16 #include "SkPDFTypes.h"
     17 
     18 // static
     19 SkPDFArray* SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
     20     SkScalar values[6];
     21     if (!matrix.asAffine(values)) {
     22         SkMatrix::SetAffineIdentity(values);
     23     }
     24 
     25     SkPDFArray* result = new SkPDFArray;
     26     result->reserve(6);
     27     for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
     28         result->appendScalar(values[i]);
     29     }
     30     return result;
     31 }
     32 
     33 // static
     34 void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
     35     SkScalar values[6];
     36     if (!matrix.asAffine(values)) {
     37         SkMatrix::SetAffineIdentity(values);
     38     }
     39     for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
     40         SkPDFScalar::Append(values[i], content);
     41         content->writeText(" ");
     42     }
     43     content->writeText("cm\n");
     44 }
     45 
     46 // static
     47 void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
     48     SkPDFScalar::Append(x, content);
     49     content->writeText(" ");
     50     SkPDFScalar::Append(y, content);
     51     content->writeText(" m\n");
     52 }
     53 
     54 // static
     55 void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
     56     SkPDFScalar::Append(x, content);
     57     content->writeText(" ");
     58     SkPDFScalar::Append(y, content);
     59     content->writeText(" l\n");
     60 }
     61 
     62 // static
     63 void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
     64                              SkScalar ctl2X, SkScalar ctl2Y,
     65                              SkScalar dstX, SkScalar dstY, SkWStream* content) {
     66     SkString cmd("y\n");
     67     SkPDFScalar::Append(ctl1X, content);
     68     content->writeText(" ");
     69     SkPDFScalar::Append(ctl1Y, content);
     70     content->writeText(" ");
     71     if (ctl2X != dstX || ctl2Y != dstY) {
     72         cmd.set("c\n");
     73         SkPDFScalar::Append(ctl2X, content);
     74         content->writeText(" ");
     75         SkPDFScalar::Append(ctl2Y, content);
     76         content->writeText(" ");
     77     }
     78     SkPDFScalar::Append(dstX, content);
     79     content->writeText(" ");
     80     SkPDFScalar::Append(dstY, content);
     81     content->writeText(" ");
     82     content->writeText(cmd.c_str());
     83 }
     84 
     85 // static
     86 void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
     87     // Skia has 0,0 at top left, pdf at bottom left.  Do the right thing.
     88     SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);
     89 
     90     SkPDFScalar::Append(rect.fLeft, content);
     91     content->writeText(" ");
     92     SkPDFScalar::Append(bottom, content);
     93     content->writeText(" ");
     94     SkPDFScalar::Append(rect.width(), content);
     95     content->writeText(" ");
     96     SkPDFScalar::Append(rect.height(), content);
     97     content->writeText(" re\n");
     98 }
     99 
    100 // static
    101 void SkPDFUtils::EmitPath(const SkPath& path, SkWStream* content) {
    102     SkPoint args[4];
    103     SkPath::Iter iter(path, false);
    104     for (SkPath::Verb verb = iter.next(args);
    105          verb != SkPath::kDone_Verb;
    106          verb = iter.next(args)) {
    107         // args gets all the points, even the implicit first point.
    108         switch (verb) {
    109             case SkPath::kMove_Verb:
    110                 MoveTo(args[0].fX, args[0].fY, content);
    111                 break;
    112             case SkPath::kLine_Verb:
    113                 AppendLine(args[1].fX, args[1].fY, content);
    114                 break;
    115             case SkPath::kQuad_Verb: {
    116                 SkPoint cubic[4];
    117                 SkConvertQuadToCubic(args, cubic);
    118                 AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
    119                             cubic[3].fX, cubic[3].fY, content);
    120                 break;
    121             }
    122             case SkPath::kCubic_Verb:
    123                 AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
    124                             args[3].fX, args[3].fY, content);
    125                 break;
    126             case SkPath::kClose_Verb:
    127                 ClosePath(content);
    128                 break;
    129             default:
    130                 SkASSERT(false);
    131                 break;
    132         }
    133     }
    134 }
    135 
    136 // static
    137 void SkPDFUtils::ClosePath(SkWStream* content) {
    138     content->writeText("h\n");
    139 }
    140 
    141 // static
    142 void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
    143                            SkWStream* content) {
    144     if (style == SkPaint::kFill_Style) {
    145         content->writeText("f");
    146     } else if (style == SkPaint::kStrokeAndFill_Style) {
    147         content->writeText("B");
    148     } else if (style == SkPaint::kStroke_Style) {
    149         content->writeText("S");
    150     }
    151 
    152     if (style != SkPaint::kStroke_Style) {
    153         NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
    154         NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
    155         if (fill == SkPath::kEvenOdd_FillType) {
    156             content->writeText("*");
    157         }
    158     }
    159     content->writeText("\n");
    160 }
    161 
    162 // static
    163 void SkPDFUtils::StrokePath(SkWStream* content) {
    164     SkPDFUtils::PaintPath(
    165         SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
    166 }
    167 
    168 // static
    169 void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
    170     content->writeText("/X");
    171     content->writeDecAsText(objectIndex);
    172     content->writeText(" Do\n");
    173 }
    174 
    175 // static
    176 void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
    177     content->writeText("/G");
    178     content->writeDecAsText(objectIndex);
    179     content->writeText(" gs\n");
    180 }
    181