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      1 // Copyright 2017 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "xfa/fxfa/parser/cxfa_linear.h"
      8 
      9 #include "fxjs/xfa/cjx_linear.h"
     10 #include "third_party/base/ptr_util.h"
     11 #include "xfa/fxfa/parser/cxfa_color.h"
     12 #include "xfa/fxgraphics/cxfa_geshading.h"
     13 
     14 namespace {
     15 
     16 const CXFA_Node::PropertyData kPropertyData[] = {{XFA_Element::Color, 1, 0},
     17                                                  {XFA_Element::Extras, 1, 0},
     18                                                  {XFA_Element::Unknown, 0, 0}};
     19 const CXFA_Node::AttributeData kAttributeData[] = {
     20     {XFA_Attribute::Id, XFA_AttributeType::CData, nullptr},
     21     {XFA_Attribute::Use, XFA_AttributeType::CData, nullptr},
     22     {XFA_Attribute::Type, XFA_AttributeType::Enum,
     23      (void*)XFA_AttributeEnum::ToRight},
     24     {XFA_Attribute::Usehref, XFA_AttributeType::CData, nullptr},
     25     {XFA_Attribute::Unknown, XFA_AttributeType::Integer, nullptr}};
     26 
     27 constexpr wchar_t kName[] = L"linear";
     28 
     29 }  // namespace
     30 
     31 CXFA_Linear::CXFA_Linear(CXFA_Document* doc, XFA_PacketType packet)
     32     : CXFA_Node(doc,
     33                 packet,
     34                 (XFA_XDPPACKET_Template | XFA_XDPPACKET_Form),
     35                 XFA_ObjectType::Node,
     36                 XFA_Element::Linear,
     37                 kPropertyData,
     38                 kAttributeData,
     39                 kName,
     40                 pdfium::MakeUnique<CJX_Linear>(this)) {}
     41 
     42 CXFA_Linear::~CXFA_Linear() {}
     43 
     44 XFA_AttributeEnum CXFA_Linear::GetType() {
     45   return JSObject()
     46       ->TryEnum(XFA_Attribute::Type, true)
     47       .value_or(XFA_AttributeEnum::ToRight);
     48 }
     49 
     50 CXFA_Color* CXFA_Linear::GetColorIfExists() {
     51   return GetChild<CXFA_Color>(0, XFA_Element::Color, false);
     52 }
     53 
     54 void CXFA_Linear::Draw(CXFA_Graphics* pGS,
     55                        CXFA_GEPath* fillPath,
     56                        FX_ARGB crStart,
     57                        const CFX_RectF& rtFill,
     58                        const CFX_Matrix& matrix) {
     59   CXFA_Color* pColor = GetColorIfExists();
     60   FX_ARGB crEnd = pColor ? pColor->GetValue() : CXFA_Color::kBlackColor;
     61 
     62   CFX_PointF ptStart;
     63   CFX_PointF ptEnd;
     64   switch (GetType()) {
     65     case XFA_AttributeEnum::ToRight:
     66       ptStart = CFX_PointF(rtFill.left, rtFill.top);
     67       ptEnd = CFX_PointF(rtFill.right(), rtFill.top);
     68       break;
     69     case XFA_AttributeEnum::ToBottom:
     70       ptStart = CFX_PointF(rtFill.left, rtFill.top);
     71       ptEnd = CFX_PointF(rtFill.left, rtFill.bottom());
     72       break;
     73     case XFA_AttributeEnum::ToLeft:
     74       ptStart = CFX_PointF(rtFill.right(), rtFill.top);
     75       ptEnd = CFX_PointF(rtFill.left, rtFill.top);
     76       break;
     77     case XFA_AttributeEnum::ToTop:
     78       ptStart = CFX_PointF(rtFill.left, rtFill.bottom());
     79       ptEnd = CFX_PointF(rtFill.left, rtFill.top);
     80       break;
     81     default:
     82       break;
     83   }
     84 
     85   CXFA_GEShading shading(ptStart, ptEnd, false, false, crStart, crEnd);
     86 
     87   pGS->SaveGraphState();
     88   pGS->SetFillColor(CXFA_GEColor(&shading));
     89   pGS->FillPath(fillPath, FXFILL_WINDING, &matrix);
     90   pGS->RestoreGraphState();
     91 }
     92