core/fpdfapi/page/cpdf_patterncs.cpp

// Copyright 2014 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.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fpdfapi/page/cpdf_patterncs.h"

#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_document.h"

CPDF_PatternCS::CPDF_PatternCS(CPDF_Document* pDoc)
    : CPDF_ColorSpace(pDoc, PDFCS_PATTERN),
      m_pBaseCS(nullptr),
      m_pCountedBaseCS(nullptr) {}

CPDF_PatternCS::~CPDF_PatternCS() {
  CPDF_ColorSpace* pCS = m_pCountedBaseCS ? m_pCountedBaseCS->get() : nullptr;
  if (pCS && m_pDocument) {
    auto* pPageData = m_pDocument->GetPageData();
    if (pPageData)
      pPageData->ReleaseColorSpace(pCS->GetArray());
  }
}

void CPDF_PatternCS::InitializeStockPattern() {
  SetComponentsForStockCS(1);
}

uint32_t CPDF_PatternCS::v_Load(CPDF_Document* pDoc,
                                CPDF_Array* pArray,
                                std::set<CPDF_Object*>* pVisited) {
  CPDF_Object* pBaseCS = pArray->GetDirectObjectAt(1);
  if (pBaseCS == m_pArray)
    return 0;

  CPDF_DocPageData* pDocPageData = pDoc->GetPageData();
  m_pBaseCS = pDocPageData->GetColorSpaceGuarded(pBaseCS, nullptr, pVisited);
  if (!m_pBaseCS)
    return 1;

  if (m_pBaseCS->GetFamily() == PDFCS_PATTERN)
    return 0;

  m_pCountedBaseCS = pDocPageData->FindColorSpacePtr(m_pBaseCS->GetArray());
  if (m_pBaseCS->CountComponents() > kMaxPatternColorComps)
    return 0;

  return m_pBaseCS->CountComponents() + 1;
}

bool CPDF_PatternCS::GetRGB(float* pBuf, float* R, float* G, float* B) const {
  if (m_pBaseCS) {
    ASSERT(m_pBaseCS->GetFamily() != PDFCS_PATTERN);
    PatternValue* pvalue = reinterpret_cast<PatternValue*>(pBuf);
    if (m_pBaseCS->GetRGB(pvalue->m_Comps, R, G, B))
      return true;
  }
  *R = 0.75f;
  *G = 0.75f;
  *B = 0.75f;
  return false;
}