1 // Copyright 2016 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 "core/fpdfapi/page/cpdf_imageobject.h" 8 9 #include <memory> 10 11 #include "core/fpdfapi/page/cpdf_docpagedata.h" 12 #include "core/fpdfapi/page/cpdf_image.h" 13 #include "core/fpdfapi/parser/cpdf_document.h" 14 #include "core/fpdfapi/parser/cpdf_stream.h" 15 #include "core/fxge/dib/cfx_dibbase.h" 16 #include "core/fxge/dib/cfx_dibitmap.h" 17 CPDF_ImageObject(int32_t content_stream)18CPDF_ImageObject::CPDF_ImageObject(int32_t content_stream) 19 : CPDF_PageObject(content_stream) {} 20 CPDF_ImageObject()21CPDF_ImageObject::CPDF_ImageObject() : CPDF_ImageObject(kNoContentStream) {} 22 ~CPDF_ImageObject()23CPDF_ImageObject::~CPDF_ImageObject() { 24 MaybePurgeCache(); 25 } 26 GetType() const27CPDF_PageObject::Type CPDF_ImageObject::GetType() const { 28 return IMAGE; 29 } 30 Transform(const CFX_Matrix & matrix)31void CPDF_ImageObject::Transform(const CFX_Matrix& matrix) { 32 m_Matrix.Concat(matrix); 33 CalcBoundingBox(); 34 SetDirty(true); 35 } 36 IsImage() const37bool CPDF_ImageObject::IsImage() const { 38 return true; 39 } 40 AsImage()41CPDF_ImageObject* CPDF_ImageObject::AsImage() { 42 return this; 43 } 44 AsImage() const45const CPDF_ImageObject* CPDF_ImageObject::AsImage() const { 46 return this; 47 } 48 CalcBoundingBox()49void CPDF_ImageObject::CalcBoundingBox() { 50 static constexpr CFX_FloatRect kRect(0.0f, 0.0f, 1.0f, 1.0f); 51 SetRect(m_Matrix.TransformRect(kRect)); 52 } 53 SetImage(const RetainPtr<CPDF_Image> & pImage)54void CPDF_ImageObject::SetImage(const RetainPtr<CPDF_Image>& pImage) { 55 MaybePurgeCache(); 56 m_pImage = pImage; 57 } 58 GetImage() const59RetainPtr<CPDF_Image> CPDF_ImageObject::GetImage() const { 60 return m_pImage; 61 } 62 GetIndependentBitmap() const63RetainPtr<CFX_DIBitmap> CPDF_ImageObject::GetIndependentBitmap() const { 64 RetainPtr<CFX_DIBBase> pSource = GetImage()->LoadDIBBase(); 65 66 // Clone() is non-virtual, and can't be overloaded by CPDF_DIB to 67 // return a clone of the subclass as one would typically expect from a 68 // such a method. Instead, it only clones the CFX_DIBBase, none of whose 69 // members point to objects owned by |this| or the form containing |this|. 70 // As a result, the clone may outlive them. 71 return pSource ? pSource->Clone(nullptr) : nullptr; 72 } 73 MaybePurgeCache()74void CPDF_ImageObject::MaybePurgeCache() { 75 if (!m_pImage) 76 return; 77 78 auto* pPageData = CPDF_DocPageData::FromDocument(m_pImage->GetDocument()); 79 if (!pPageData) 80 return; 81 82 CPDF_Stream* pStream = m_pImage->GetStream(); 83 if (!pStream) 84 return; 85 86 uint32_t objnum = pStream->GetObjNum(); 87 if (!objnum) 88 return; 89 90 m_pImage.Reset(); // Clear my reference before asking the cache. 91 pPageData->MaybePurgeImage(objnum); 92 } 93