Move rectangle drawing code to CXFA_Rectangle

This CL moves code related to drawing rectangles to the CXFA_Rectangle
class. This also turns CXFA_Border into a CXFA_Rectangle to share the
drawing code.

Change-Id: I91e2e73b33ecbcda477cf953cf7609310a01fcd4
Reviewed-on: https://pdfium-review.googlesource.com/23110
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 435 insertions, 0 deletions

diff --git a/xfa/fxfa/parser/cxfa_rectangle.cpp b/xfa/fxfa/parser/cxfa_rectangle.cpp
index 01a204d149..861cf443a7 100644
--- a/xfa/fxfa/parser/cxfa_rectangle.cpp
+++ b/xfa/fxfa/parser/cxfa_rectangle.cpp
@@ -6,8 +6,12 @@
 
 #include "xfa/fxfa/parser/cxfa_rectangle.h"
 
+#include <utility>
+
 #include "fxjs/xfa/cjx_rectangle.h"
 #include "third_party/base/ptr_util.h"
+#include "xfa/fxfa/parser/cxfa_corner.h"
+#include "xfa/fxfa/parser/cxfa_stroke.h"
 
 namespace {
 
@@ -38,4 +42,435 @@ CXFA_Rectangle::CXFA_Rectangle(CXFA_Document* doc, XFA_PacketType packet)
                kName,
                pdfium::MakeUnique<CJX_Rectangle>(this)) {}
 
+CXFA_Rectangle::CXFA_Rectangle(CXFA_Document* pDoc,
+                               XFA_PacketType ePacket,
+                               uint32_t validPackets,
+                               XFA_ObjectType oType,
+                               XFA_Element eType,
+                               const PropertyData* properties,
+                               const AttributeData* attributes,
+                               const WideStringView& elementName,
+                               std::unique_ptr<CJX_Object> js_node)
+    : CXFA_Box(pDoc,
+               ePacket,
+               validPackets,
+               oType,
+               eType,
+               properties,
+               attributes,
+               elementName,
+               std::move(js_node)) {}
+
 CXFA_Rectangle::~CXFA_Rectangle() {}
+
+void CXFA_Rectangle::Draw(const std::vector<CXFA_Stroke*>& strokes,
+                          CXFA_Graphics* pGS,
+                          CFX_RectF rtWidget,
+                          const CFX_Matrix& matrix) {
+  bool bVisible = false;
+  for (int32_t j = 0; j < 4; j++) {
+    if (strokes[j * 2 + 1]->IsVisible()) {
+      bVisible = true;
+      break;
+    }
+  }
+  if (!bVisible)
+    return;
+
+  for (int32_t i = 1; i < 8; i += 2) {
+    float fThickness = std::fmax(0.0, strokes[i]->GetThickness());
+    float fHalf = fThickness / 2;
+    XFA_AttributeEnum iHand = GetHand();
+    switch (i) {
+      case 1:
+        if (iHand == XFA_AttributeEnum::Left) {
+          rtWidget.top -= fHalf;
+          rtWidget.height += fHalf;
+        } else if (iHand == XFA_AttributeEnum::Right) {
+          rtWidget.top += fHalf;
+          rtWidget.height -= fHalf;
+        }
+        break;
+      case 3:
+        if (iHand == XFA_AttributeEnum::Left) {
+          rtWidget.width += fHalf;
+        } else if (iHand == XFA_AttributeEnum::Right) {
+          rtWidget.width -= fHalf;
+        }
+        break;
+      case 5:
+        if (iHand == XFA_AttributeEnum::Left) {
+          rtWidget.height += fHalf;
+        } else if (iHand == XFA_AttributeEnum::Right) {
+          rtWidget.height -= fHalf;
+        }
+        break;
+      case 7:
+        if (iHand == XFA_AttributeEnum::Left) {
+          rtWidget.left -= fHalf;
+          rtWidget.width += fHalf;
+        } else if (iHand == XFA_AttributeEnum::Right) {
+          rtWidget.left += fHalf;
+          rtWidget.width -= fHalf;
+        }
+        break;
+    }
+  }
+  Stroke(strokes, pGS, rtWidget, matrix);
+}
+
+void CXFA_Rectangle::Stroke(const std::vector<CXFA_Stroke*>& strokes,
+                            CXFA_Graphics* pGS,
+                            CFX_RectF rtWidget,
+                            const CFX_Matrix& matrix) {
+  bool bVisible;
+  float fThickness;
+  XFA_AttributeEnum i3DType;
+  std::tie(i3DType, bVisible, fThickness) = Get3DStyle();
+  if (i3DType != XFA_AttributeEnum::Unknown) {
+    if (!bVisible || fThickness < 0.001f)
+      return;
+
+    switch (i3DType) {
+      case XFA_AttributeEnum::Lowered:
+        StrokeLowered(pGS, rtWidget, fThickness, matrix);
+        break;
+      case XFA_AttributeEnum::Raised:
+        StrokeRaised(pGS, rtWidget, fThickness, matrix);
+        break;
+      case XFA_AttributeEnum::Etched:
+        StrokeEtched(pGS, rtWidget, fThickness, matrix);
+        break;
+      case XFA_AttributeEnum::Embossed:
+        StrokeEmbossed(pGS, rtWidget, fThickness, matrix);
+        break;
+      default:
+        NOTREACHED();
+        break;
+    }
+    return;
+  }
+
+  bool bClose = false;
+  bool bSameStyles = true;
+  CXFA_Stroke* stroke1 = strokes[0];
+  for (int32_t i = 1; i < 8; i++) {
+    CXFA_Stroke* stroke2 = strokes[i];
+    if (!stroke1->SameStyles(stroke2, 0)) {
+      bSameStyles = false;
+      break;
+    }
+    stroke1 = stroke2;
+  }
+  if (bSameStyles) {
+    stroke1 = strokes[0];
+    bClose = true;
+    for (int32_t i = 2; i < 8; i += 2) {
+      CXFA_Stroke* stroke2 = strokes[i];
+      if (!stroke1->SameStyles(stroke2, XFA_STROKE_SAMESTYLE_NoPresence |
+                                            XFA_STROKE_SAMESTYLE_Corner)) {
+        bSameStyles = false;
+        break;
+      }
+      stroke1 = stroke2;
+    }
+    if (bSameStyles) {
+      stroke1 = strokes[0];
+      if (stroke1->IsInverted())
+        bSameStyles = false;
+      if (stroke1->GetJoinType() != XFA_AttributeEnum::Square)
+        bSameStyles = false;
+    }
+  }
+
+  bool bStart = true;
+  CXFA_GEPath path;
+  for (int32_t i = 0; i < 8; i++) {
+    CXFA_Stroke* stroke = strokes[i];
+    if ((i % 1) == 0 && stroke->GetRadius() < 0) {
+      bool bEmpty = path.IsEmpty();
+      if (!bEmpty) {
+        if (stroke)
+          stroke->Stroke(&path, pGS, matrix);
+        path.Clear();
+      }
+      bStart = true;
+      continue;
+    }
+    GetPath(strokes, rtWidget, path, i, bStart, !bSameStyles);
+
+    bStart = !stroke->SameStyles(strokes[(i + 1) % 8], 0);
+    if (bStart) {
+      if (stroke)
+        stroke->Stroke(&path, pGS, matrix);
+      path.Clear();
+    }
+  }
+  bool bEmpty = path.IsEmpty();
+  if (!bEmpty) {
+    if (bClose) {
+      path.Close();
+    }
+    if (strokes[7])
+      strokes[7]->Stroke(&path, pGS, matrix);
+  }
+}
+
+void CXFA_Rectangle::StrokeRect(CXFA_Graphics* pGraphic,
+                                const CFX_RectF& rt,
+                                float fLineWidth,
+                                const CFX_Matrix& matrix,
+                                FX_ARGB argbTopLeft,
+                                FX_ARGB argbBottomRight) {
+  float fBottom = rt.bottom();
+  float fRight = rt.right();
+  CXFA_GEPath pathLT;
+  pathLT.MoveTo(CFX_PointF(rt.left, fBottom));
+  pathLT.LineTo(CFX_PointF(rt.left, rt.top));
+  pathLT.LineTo(CFX_PointF(fRight, rt.top));
+  pathLT.LineTo(CFX_PointF(fRight - fLineWidth, rt.top + fLineWidth));
+  pathLT.LineTo(CFX_PointF(rt.left + fLineWidth, rt.top + fLineWidth));
+  pathLT.LineTo(CFX_PointF(rt.left + fLineWidth, fBottom - fLineWidth));
+  pathLT.LineTo(CFX_PointF(rt.left, fBottom));
+  pGraphic->SetFillColor(CXFA_GEColor(argbTopLeft));
+  pGraphic->FillPath(&pathLT, FXFILL_WINDING, &matrix);
+
+  CXFA_GEPath pathRB;
+  pathRB.MoveTo(CFX_PointF(fRight, rt.top));
+  pathRB.LineTo(CFX_PointF(fRight, fBottom));
+  pathRB.LineTo(CFX_PointF(rt.left, fBottom));
+  pathRB.LineTo(CFX_PointF(rt.left + fLineWidth, fBottom - fLineWidth));
+  pathRB.LineTo(CFX_PointF(fRight - fLineWidth, fBottom - fLineWidth));
+  pathRB.LineTo(CFX_PointF(fRight - fLineWidth, rt.top + fLineWidth));
+  pathRB.LineTo(CFX_PointF(fRight, rt.top));
+  pGraphic->SetFillColor(CXFA_GEColor(argbBottomRight));
+  pGraphic->FillPath(&pathRB, FXFILL_WINDING, &matrix);
+}
+
+void CXFA_Rectangle::StrokeLowered(CXFA_Graphics* pGS,
+                                   CFX_RectF rt,
+                                   float fThickness,
+                                   const CFX_Matrix& matrix) {
+  float fHalfWidth = fThickness / 2.0f;
+  CFX_RectF rtInner(rt);
+  rtInner.Deflate(fHalfWidth, fHalfWidth);
+
+  CXFA_GEPath path;
+  path.AddRectangle(rt.left, rt.top, rt.width, rt.height);
+  path.AddRectangle(rtInner.left, rtInner.top, rtInner.width, rtInner.height);
+  pGS->SetFillColor(CXFA_GEColor(0xFF000000));
+  pGS->FillPath(&path, FXFILL_ALTERNATE, &matrix);
+
+  StrokeRect(pGS, rtInner, fHalfWidth, matrix, 0xFF808080, 0xFFC0C0C0);
+}
+
+void CXFA_Rectangle::StrokeRaised(CXFA_Graphics* pGS,
+                                  CFX_RectF rt,
+                                  float fThickness,
+                                  const CFX_Matrix& matrix) {
+  float fHalfWidth = fThickness / 2.0f;
+  CFX_RectF rtInner(rt);
+  rtInner.Deflate(fHalfWidth, fHalfWidth);
+
+  CXFA_GEPath path;
+  path.AddRectangle(rt.left, rt.top, rt.width, rt.height);
+  path.AddRectangle(rtInner.left, rtInner.top, rtInner.width, rtInner.height);
+  pGS->SetFillColor(CXFA_GEColor(0xFF000000));
+  pGS->FillPath(&path, FXFILL_ALTERNATE, &matrix);
+
+  StrokeRect(pGS, rtInner, fHalfWidth, matrix, 0xFFFFFFFF, 0xFF808080);
+}
+
+void CXFA_Rectangle::StrokeEtched(CXFA_Graphics* pGS,
+                                  CFX_RectF rt,
+                                  float fThickness,
+                                  const CFX_Matrix& matrix) {
+  float fHalfWidth = fThickness / 2.0f;
+  StrokeRect(pGS, rt, fThickness, matrix, 0xFF808080, 0xFFFFFFFF);
+
+  CFX_RectF rtInner(rt);
+  rtInner.Deflate(fHalfWidth, fHalfWidth);
+  StrokeRect(pGS, rtInner, fHalfWidth, matrix, 0xFFFFFFFF, 0xFF808080);
+}
+
+void CXFA_Rectangle::StrokeEmbossed(CXFA_Graphics* pGS,
+                                    CFX_RectF rt,
+                                    float fThickness,
+                                    const CFX_Matrix& matrix) {
+  float fHalfWidth = fThickness / 2.0f;
+  StrokeRect(pGS, rt, fThickness, matrix, 0xFF808080, 0xFF000000);
+
+  CFX_RectF rtInner(rt);
+  rtInner.Deflate(fHalfWidth, fHalfWidth);
+  StrokeRect(pGS, rtInner, fHalfWidth, matrix, 0xFF000000, 0xFF808080);
+}
+
+void CXFA_Rectangle::GetPath(const std::vector<CXFA_Stroke*>& strokes,
+                             CFX_RectF rtWidget,
+                             CXFA_GEPath& path,
+                             int32_t nIndex,
+                             bool bStart,
+                             bool bCorner) {
+  ASSERT(nIndex >= 0 && nIndex < 8);
+
+  int32_t n = (nIndex & 1) ? nIndex - 1 : nIndex;
+  auto* corner1 = static_cast<CXFA_Corner*>(strokes[n]);
+  auto* corner2 = static_cast<CXFA_Corner*>(strokes[(n + 2) % 8]);
+  float fRadius1 = bCorner ? corner1->GetRadius() : 0.0f;
+  float fRadius2 = bCorner ? corner2->GetRadius() : 0.0f;
+  bool bInverted = corner1->IsInverted();
+  float offsetY = 0.0f;
+  float offsetX = 0.0f;
+  bool bRound = corner1->GetJoinType() == XFA_AttributeEnum::Round;
+  float halfAfter = 0.0f;
+  float halfBefore = 0.0f;
+
+  CXFA_Stroke* stroke = strokes[nIndex];
+  if (stroke->IsCorner()) {
+    CXFA_Stroke* strokeBefore = strokes[(nIndex + 1 * 8 - 1) % 8];
+    CXFA_Stroke* strokeAfter = strokes[nIndex + 1];
+    if (stroke->IsInverted()) {
+      if (!stroke->SameStyles(strokeBefore, 0))
+        halfBefore = strokeBefore->GetThickness() / 2;
+      if (!stroke->SameStyles(strokeAfter, 0))
+        halfAfter = strokeAfter->GetThickness() / 2;
+    }
+  } else {
+    CXFA_Stroke* strokeBefore = strokes[(nIndex + 8 - 2) % 8];
+    CXFA_Stroke* strokeAfter = strokes[(nIndex + 2) % 8];
+    if (!bRound && !bInverted) {
+      halfBefore = strokeBefore->GetThickness() / 2;
+      halfAfter = strokeAfter->GetThickness() / 2;
+    }
+  }
+
+  float offsetEX = 0.0f;
+  float offsetEY = 0.0f;
+  float sx = 0.0f;
+  float sy = 0.0f;
+  float vx = 1.0f;
+  float vy = 1.0f;
+  float nx = 1.0f;
+  float ny = 1.0f;
+  CFX_PointF cpStart;
+  CFX_PointF cp1;
+  CFX_PointF cp2;
+  if (bRound)
+    sy = FX_PI / 2;
+
+  switch (nIndex) {
+    case 0:
+    case 1:
+      cp1 = rtWidget.TopLeft();
+      cp2 = rtWidget.TopRight();
+      if (nIndex == 0) {
+        cpStart.x = cp1.x - halfBefore;
+        cpStart.y = cp1.y + fRadius1, offsetY = -halfAfter;
+      } else {
+        cpStart.x = cp1.x + fRadius1 - halfBefore, cpStart.y = cp1.y,
+        offsetEX = halfAfter;
+      }
+      vx = 1, vy = 1;
+      nx = -1, ny = 0;
+      if (bRound) {
+        sx = bInverted ? FX_PI / 2 : FX_PI;
+      } else {
+        sx = 1, sy = 0;
+      }
+      break;
+    case 2:
+    case 3:
+      cp1 = rtWidget.TopRight();
+      cp2 = rtWidget.BottomRight();
+      if (nIndex == 2) {
+        cpStart.x = cp1.x - fRadius1, cpStart.y = cp1.y - halfBefore,
+        offsetX = halfAfter;
+      } else {
+        cpStart.x = cp1.x, cpStart.y = cp1.y + fRadius1 - halfBefore,
+        offsetEY = halfAfter;
+      }
+      vx = -1, vy = 1;
+      nx = 0, ny = -1;
+      if (bRound) {
+        sx = bInverted ? FX_PI : FX_PI * 3 / 2;
+      } else {
+        sx = 0, sy = 1;
+      }
+      break;
+    case 4:
+    case 5:
+      cp1 = rtWidget.BottomRight();
+      cp2 = rtWidget.BottomLeft();
+      if (nIndex == 4) {
+        cpStart.x = cp1.x + halfBefore, cpStart.y = cp1.y - fRadius1,
+        offsetY = halfAfter;
+      } else {
+        cpStart.x = cp1.x - fRadius1 + halfBefore, cpStart.y = cp1.y,
+        offsetEX = -halfAfter;
+      }
+      vx = -1, vy = -1;
+      nx = 1, ny = 0;
+      if (bRound) {
+        sx = bInverted ? FX_PI * 3 / 2 : 0;
+      } else {
+        sx = -1, sy = 0;
+      }
+      break;
+    case 6:
+    case 7:
+      cp1 = rtWidget.BottomLeft();
+      cp2 = rtWidget.TopLeft();
+      if (nIndex == 6) {
+        cpStart.x = cp1.x + fRadius1, cpStart.y = cp1.y + halfBefore,
+        offsetX = -halfAfter;
+      } else {
+        cpStart.x = cp1.x, cpStart.y = cp1.y - fRadius1 + halfBefore,
+        offsetEY = -halfAfter;
+      }
+      vx = 1;
+      vy = -1;
+      nx = 0;
+      ny = 1;
+      if (bRound) {
+        sx = bInverted ? 0 : FX_PI / 2;
+      } else {
+        sx = 0;
+        sy = -1;
+      }
+      break;
+  }
+  if (bStart) {
+    path.MoveTo(cpStart);
+  }
+  if (nIndex & 1) {
+    path.LineTo(CFX_PointF(cp2.x + fRadius2 * nx + offsetEX,
+                           cp2.y + fRadius2 * ny + offsetEY));
+    return;
+  }
+  if (bRound) {
+    if (fRadius1 < 0)
+      sx -= FX_PI;
+    if (bInverted)
+      sy *= -1;
+
+    CFX_RectF rtRadius(cp1.x + offsetX * 2, cp1.y + offsetY * 2,
+                       fRadius1 * 2 * vx - offsetX * 2,
+                       fRadius1 * 2 * vy - offsetY * 2);
+    rtRadius.Normalize();
+    if (bInverted)
+      rtRadius.Offset(-fRadius1 * vx, -fRadius1 * vy);
+
+    path.ArcTo(rtRadius.TopLeft(), rtRadius.Size(), sx, sy);
+  } else {
+    CFX_PointF cp;
+    if (bInverted) {
+      cp.x = cp1.x + fRadius1 * vx;
+      cp.y = cp1.y + fRadius1 * vy;
+    } else {
+      cp = cp1;
+    }
+    path.LineTo(cp);
+    path.LineTo(CFX_PointF(cp1.x + fRadius1 * sx + offsetX,
+                           cp1.y + fRadius1 * sy + offsetY));
+  }
+}