133 lines
3.3 KiB
C++
133 lines
3.3 KiB
C++
// Copyright 2016 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fpdfdoc/cpdf_dest.h"
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#include <algorithm>
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#include "core/fpdfapi/parser/cpdf_array.h"
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#include "core/fpdfapi/parser/cpdf_document.h"
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#include "core/fpdfapi/parser/cpdf_name.h"
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#include "core/fpdfapi/parser/cpdf_number.h"
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namespace {
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// These arrays are indexed by the PDFDEST_VIEW_* constants.
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// Last element is a sentinel.
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const char* const g_sZoomModes[] = {"Unknown", "XYZ", "Fit", "FitH",
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"FitV", "FitR", "FitB", "FitBH",
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"FitBV", nullptr};
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const uint8_t g_sZoomModeMaxParamCount[] = {0, 3, 0, 1, 1, 4, 0, 1, 1, 0};
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static_assert(FX_ArraySize(g_sZoomModes) ==
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FX_ArraySize(g_sZoomModeMaxParamCount),
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"Zoom mode count Mismatch");
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} // namespace
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CPDF_Dest::CPDF_Dest() {}
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CPDF_Dest::CPDF_Dest(const CPDF_Array* pArray) : m_pArray(pArray) {}
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CPDF_Dest::CPDF_Dest(const CPDF_Dest& that) = default;
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CPDF_Dest::~CPDF_Dest() {}
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int CPDF_Dest::GetDestPageIndex(CPDF_Document* pDoc) const {
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if (!m_pArray)
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return -1;
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const CPDF_Object* pPage = m_pArray->GetDirectObjectAt(0);
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if (!pPage)
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return -1;
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if (pPage->IsNumber())
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return pPage->GetInteger();
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if (!pPage->IsDictionary())
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return -1;
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return pDoc->GetPageIndex(pPage->GetObjNum());
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}
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int CPDF_Dest::GetZoomMode() const {
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if (!m_pArray)
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return 0;
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const CPDF_Object* pArray = m_pArray->GetDirectObjectAt(1);
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if (!pArray)
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return 0;
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ByteString mode = pArray->GetString();
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for (int i = 1; g_sZoomModes[i]; ++i) {
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if (mode == g_sZoomModes[i])
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return i;
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}
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return 0;
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}
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bool CPDF_Dest::GetXYZ(bool* pHasX,
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bool* pHasY,
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bool* pHasZoom,
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float* pX,
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float* pY,
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float* pZoom) const {
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*pHasX = false;
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*pHasY = false;
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*pHasZoom = false;
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if (!m_pArray)
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return false;
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if (m_pArray->size() < 5)
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return false;
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const CPDF_Name* xyz = ToName(m_pArray->GetDirectObjectAt(1));
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if (!xyz || xyz->GetString() != "XYZ")
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return false;
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const CPDF_Number* numX = ToNumber(m_pArray->GetDirectObjectAt(2));
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const CPDF_Number* numY = ToNumber(m_pArray->GetDirectObjectAt(3));
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const CPDF_Number* numZoom = ToNumber(m_pArray->GetDirectObjectAt(4));
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// If the value is a CPDF_Null then ToNumber will return nullptr.
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*pHasX = !!numX;
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*pHasY = !!numY;
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*pHasZoom = !!numZoom;
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if (numX)
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*pX = numX->GetNumber();
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if (numY)
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*pY = numY->GetNumber();
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// A zoom value of 0 is equivalent to a null value, so treat it as a null.
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if (numZoom) {
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float num = numZoom->GetNumber();
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if (num == 0.0)
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*pHasZoom = false;
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else
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*pZoom = num;
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}
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return true;
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}
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unsigned long CPDF_Dest::GetNumParams() const {
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if (!m_pArray || m_pArray->size() < 2)
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return 0;
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unsigned long maxParamsForFitType = g_sZoomModeMaxParamCount[GetZoomMode()];
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unsigned long numParamsInArray = m_pArray->size() - 2;
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return std::min(maxParamsForFitType, numParamsInArray);
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}
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float CPDF_Dest::GetParam(int index) const {
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return m_pArray ? m_pArray->GetNumberAt(2 + index) : 0;
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}
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