xref: /aosp_15_r20/external/pdfium/core/fpdfapi/page/cpdf_imageobject.cpp (revision 3ac0a46f773bac49fa9476ec2b1cf3f8da5ec3a4) 
1 // Copyright 2016 The PDFium Authors
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 <utility>
10 
11 #include "core/fpdfapi/page/cpdf_docpagedata.h"
12 #include "core/fpdfapi/page/cpdf_image.h"
13 #include "core/fpdfapi/parser/cpdf_stream.h"
14 #include "core/fxcrt/fx_coordinates.h"
15 #include "core/fxge/dib/cfx_dibbase.h"
16 #include "core/fxge/dib/cfx_dibitmap.h"
17 
CPDF_ImageObject(int32_t content_stream)18 CPDF_ImageObject::CPDF_ImageObject(int32_t content_stream)
19     : CPDF_PageObject(content_stream) {}
20 
CPDF_ImageObject()21 CPDF_ImageObject::CPDF_ImageObject() : CPDF_ImageObject(kNoContentStream) {}
22 
~CPDF_ImageObject()23 CPDF_ImageObject::~CPDF_ImageObject() {
24   MaybePurgeCache();
25 }
26 
GetType() const27 CPDF_PageObject::Type CPDF_ImageObject::GetType() const {
28   return Type::kImage;
29 }
30 
Transform(const CFX_Matrix & matrix)31 void CPDF_ImageObject::Transform(const CFX_Matrix& matrix) {
32   m_Matrix.Concat(matrix);
33   CalcBoundingBox();
34   SetDirty(true);
35 }
36 
IsImage() const37 bool CPDF_ImageObject::IsImage() const {
38   return true;
39 }
40 
AsImage()41 CPDF_ImageObject* CPDF_ImageObject::AsImage() {
42   return this;
43 }
44 
AsImage() const45 const CPDF_ImageObject* CPDF_ImageObject::AsImage() const {
46   return this;
47 }
48 
CalcBoundingBox()49 void CPDF_ImageObject::CalcBoundingBox() {
50   static constexpr CFX_FloatRect kRect(0.0f, 0.0f, 1.0f, 1.0f);
51   SetOriginalRect(kRect);
52   SetRect(m_Matrix.TransformRect(kRect));
53 }
54 
SetImage(RetainPtr<CPDF_Image> pImage)55 void CPDF_ImageObject::SetImage(RetainPtr<CPDF_Image> pImage) {
56   MaybePurgeCache();
57   m_pImage = std::move(pImage);
58 }
59 
GetImage() const60 RetainPtr<CPDF_Image> CPDF_ImageObject::GetImage() const {
61   return m_pImage;
62 }
63 
GetIndependentBitmap() const64 RetainPtr<CFX_DIBitmap> CPDF_ImageObject::GetIndependentBitmap() const {
65   RetainPtr<CFX_DIBBase> pSource = GetImage()->LoadDIBBase();
66 
67   // Realize() is non-virtual, and can't be overloaded by CPDF_DIB to
68   // return a full-up CPDF_DIB subclass. Instead, it only works upon the
69   // CFX_DIBBase, which is convenient since none of its members point to
70   // objects owned by |this| or the form containing |this|. As a result,
71   // the new bitmap may outlive them, giving the "independent" property
72   // this method is named after.
73   return pSource ? pSource->Realize() : nullptr;
74 }
75 
SetImageMatrix(const CFX_Matrix & matrix)76 void CPDF_ImageObject::SetImageMatrix(const CFX_Matrix& matrix) {
77   m_Matrix = matrix;
78   CalcBoundingBox();
79 }
80 
MaybePurgeCache()81 void CPDF_ImageObject::MaybePurgeCache() {
82   if (!m_pImage)
83     return;
84 
85   RetainPtr<const CPDF_Stream> pStream = m_pImage->GetStream();
86   if (!pStream)
87     return;
88 
89   uint32_t objnum = pStream->GetObjNum();
90   if (!objnum)
91     return;
92 
93   auto* pDoc = m_pImage->GetDocument();
94   CHECK(pDoc);
95 
96   m_pImage.Reset();  // Clear my reference before asking the cache.
97   pDoc->MaybePurgeImage(objnum);
98 }
99