Add APIs for path construction and paintingchromium/3006

Added methods to create paths, set their colors, determine whether they will be
stroked and/or filled. FPDFPage_InsertObject should be used to add a path to a
page.

BUG=pdfium:661

Change-Id: I8fd17b33a09c5126e517bfd1a69a893216c160e8
Reviewed-on: https://pdfium-review.googlesource.com/2534
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

2 files changed, 135 insertions, 0 deletions

diff --git a/fpdfsdk/fpdfeditpath.cpp b/fpdfsdk/fpdfeditpath.cpp
new file mode 100644
index 0000000000..1641510ca1
--- /dev/null
+++ b/fpdfsdk/fpdfeditpath.cpp
@@ -0,0 +1,126 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "public/fpdf_edit.h"
+
+#include "core/fpdfapi/page/cpdf_path.h"
+#include "core/fpdfapi/page/cpdf_pathobject.h"
+#include "core/fxcrt/fx_system.h"
+
+DLLEXPORT FPDF_PAGEOBJECT STDCALL FPDFPageObj_CreateNewPath(float x, float y) {
+  CPDF_PathObject* pPathObj = new CPDF_PathObject;
+  pPathObj->m_Path.AppendPoint(x, y, FXPT_TYPE::MoveTo, false);
+  return pPathObj;
+}
+
+DLLEXPORT FPDF_PAGEOBJECT STDCALL FPDFPageObj_CreateNewRect(float x,
+                                                            float y,
+                                                            float w,
+                                                            float h) {
+  CPDF_PathObject* pPathObj = new CPDF_PathObject;
+  pPathObj->m_Path.AppendRect(x, y, x + w, y + h);
+  return pPathObj;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_SetStrokeColor(FPDF_PAGEOBJECT path,
+                                            unsigned int R,
+                                            unsigned int G,
+                                            unsigned int B,
+                                            unsigned int A) {
+  if (!path || R > 255 || G > 255 || B > 255 || A > 255)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+  pPathObj->m_GeneralState.SetStrokeAlpha(A / 255.f);
+  FX_FLOAT rgb[3] = {R / 255.f, G / 255.f, B / 255.f};
+  pPathObj->m_ColorState.SetStrokeColor(
+      CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB), rgb, 3);
+  return true;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_SetFillColor(FPDF_PAGEOBJECT path,
+                                          unsigned int R,
+                                          unsigned int G,
+                                          unsigned int B,
+                                          unsigned int A) {
+  if (!path || R > 255 || G > 255 || B > 255 || A > 255)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+  pPathObj->m_GeneralState.SetFillAlpha(A / 255.f);
+  FX_FLOAT rgb[3] = {R / 255.f, G / 255.f, B / 255.f};
+  pPathObj->m_ColorState.SetFillColor(
+      CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB), rgb, 3);
+  return true;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_MoveTo(FPDF_PAGEOBJECT path, float x, float y) {
+  if (!path)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+  pPathObj->m_Path.AppendPoint(x, y, FXPT_TYPE::MoveTo, false);
+  return true;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_LineTo(FPDF_PAGEOBJECT path, float x, float y) {
+  if (!path)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+  pPathObj->m_Path.AppendPoint(x, y, FXPT_TYPE::LineTo, false);
+  return true;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_BezierTo(FPDF_PAGEOBJECT path,
+                                      float x1,
+                                      float y1,
+                                      float x2,
+                                      float y2,
+                                      float x3,
+                                      float y3) {
+  if (!path)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+  pPathObj->m_Path.AppendPoint(x1, y1, FXPT_TYPE::BezierTo, false);
+  pPathObj->m_Path.AppendPoint(x2, y2, FXPT_TYPE::BezierTo, false);
+  pPathObj->m_Path.AppendPoint(x3, y3, FXPT_TYPE::BezierTo, false);
+  return true;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_Close(FPDF_PAGEOBJECT path) {
+  if (!path)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+  int numPoints = pPathObj->m_Path.GetPointCount();
+  if (numPoints == 0)
+    return false;
+
+  FX_PATHPOINT* pPoints = pPathObj->m_Path.GetMutablePoints();
+  if (pPoints[numPoints - 1].m_CloseFigure)
+    return true;
+
+  pPoints[numPoints - 1].m_CloseFigure = true;
+  return true;
+}
+
+DLLEXPORT FPDF_BOOL FPDFPath_SetDrawMode(FPDF_PAGEOBJECT path,
+                                         int fillmode,
+                                         FPDF_BOOL stroke) {
+  if (!path)
+    return false;
+
+  auto pPathObj = reinterpret_cast<CPDF_PathObject*>(path);
+
+  if (fillmode == FPDF_FILLMODE_ALTERNATE)
+    pPathObj->m_FillType = FXFILL_ALTERNATE;
+  else if (fillmode == FPDF_FILLMODE_WINDING)
+    pPathObj->m_FillType = FXFILL_WINDING;
+  else
+    pPathObj->m_FillType = 0;
+  pPathObj->m_bStroke = stroke != 0;
+  return true;
+}
diff --git a/fpdfsdk/fpdfview_c_api_test.c b/fpdfsdk/fpdfview_c_api_test.c
index 98478f0410..8ec3a26d3a 100644
--- a/fpdfsdk/fpdfview_c_api_test.c
+++ b/fpdfsdk/fpdfview_c_api_test.c
@@ -85,6 +85,15 @@ int CheckPDFiumCApi() {
     CHK(FPDFImageObj_LoadJpegFile);
     CHK(FPDFImageObj_SetMatrix);
     CHK(FPDFImageObj_SetBitmap);
+    CHK(FPDFPageObj_CreateNewPath);
+    CHK(FPDFPageObj_CreateNewRect);
+    CHK(FPDFPath_SetStrokeColor);
+    CHK(FPDFPath_SetFillColor);
+    CHK(FPDFPath_MoveTo);
+    CHK(FPDFPath_LineTo);
+    CHK(FPDFPath_BezierTo);
+    CHK(FPDFPath_Close);
+    CHK(FPDFPath_SetDrawMode);
 
     // fpdf_ext.h
     CHK(FSDK_SetUnSpObjProcessHandler);