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/render/cpdf_progressiverenderer.h"
8
9 #include "core/fpdfapi/page/cpdf_image.h"
10 #include "core/fpdfapi/page/cpdf_imageobject.h"
11 #include "core/fpdfapi/page/cpdf_pageobject.h"
12 #include "core/fpdfapi/page/cpdf_pageobjectholder.h"
13 #include "core/fpdfapi/render/cpdf_pagerendercache.h"
14 #include "core/fpdfapi/render/cpdf_renderoptions.h"
15 #include "core/fpdfapi/render/cpdf_renderstatus.h"
16 #include "core/fxcrt/pauseindicator_iface.h"
17 #include "core/fxge/cfx_renderdevice.h"
18 #include "third_party/base/ptr_util.h"
19
CPDF_ProgressiveRenderer(CPDF_RenderContext * pContext,CFX_RenderDevice * pDevice,const CPDF_RenderOptions * pOptions)20 CPDF_ProgressiveRenderer::CPDF_ProgressiveRenderer(
21 CPDF_RenderContext* pContext,
22 CFX_RenderDevice* pDevice,
23 const CPDF_RenderOptions* pOptions)
24 : m_pContext(pContext), m_pDevice(pDevice), m_pOptions(pOptions) {}
25
~CPDF_ProgressiveRenderer()26 CPDF_ProgressiveRenderer::~CPDF_ProgressiveRenderer() {
27 if (m_pRenderStatus) {
28 m_pRenderStatus.reset(); // Release first.
29 m_pDevice->RestoreState(false);
30 }
31 }
32
Start(PauseIndicatorIface * pPause)33 void CPDF_ProgressiveRenderer::Start(PauseIndicatorIface* pPause) {
34 if (!m_pContext || !m_pDevice || m_Status != kReady) {
35 m_Status = kFailed;
36 return;
37 }
38 m_Status = kToBeContinued;
39 Continue(pPause);
40 }
41
Continue(PauseIndicatorIface * pPause)42 void CPDF_ProgressiveRenderer::Continue(PauseIndicatorIface* pPause) {
43 while (m_Status == kToBeContinued) {
44 if (!m_pCurrentLayer) {
45 if (m_LayerIndex >= m_pContext->CountLayers()) {
46 m_Status = kDone;
47 return;
48 }
49 m_pCurrentLayer = m_pContext->GetLayer(m_LayerIndex);
50 m_LastObjectRendered = m_pCurrentLayer->m_pObjectHolder->end();
51 m_pRenderStatus = pdfium::MakeUnique<CPDF_RenderStatus>(m_pContext.Get(),
52 m_pDevice.Get());
53 if (m_pOptions)
54 m_pRenderStatus->SetOptions(*m_pOptions);
55 m_pRenderStatus->SetTransparency(
56 m_pCurrentLayer->m_pObjectHolder->GetTransparency());
57 m_pRenderStatus->Initialize(nullptr, nullptr);
58 m_pDevice->SaveState();
59 m_ClipRect = m_pCurrentLayer->m_Matrix.GetInverse().TransformRect(
60 CFX_FloatRect(m_pDevice->GetClipBox()));
61 }
62 CPDF_PageObjectHolder::const_iterator iter;
63 CPDF_PageObjectHolder::const_iterator iterEnd =
64 m_pCurrentLayer->m_pObjectHolder->end();
65 if (m_LastObjectRendered != iterEnd) {
66 iter = m_LastObjectRendered;
67 ++iter;
68 } else {
69 iter = m_pCurrentLayer->m_pObjectHolder->begin();
70 }
71 int nObjsToGo = kStepLimit;
72 bool is_mask = false;
73 while (iter != iterEnd) {
74 CPDF_PageObject* pCurObj = iter->get();
75 if (pCurObj && pCurObj->GetRect().left <= m_ClipRect.right &&
76 pCurObj->GetRect().right >= m_ClipRect.left &&
77 pCurObj->GetRect().bottom <= m_ClipRect.top &&
78 pCurObj->GetRect().top >= m_ClipRect.bottom) {
79 if (m_pOptions->GetOptions().bBreakForMasks && pCurObj->IsImage() &&
80 pCurObj->AsImage()->GetImage()->IsMask()) {
81 if (m_pDevice->GetDeviceType() == DeviceType::kPrinter) {
82 m_LastObjectRendered = iter;
83 m_pRenderStatus->ProcessClipPath(pCurObj->m_ClipPath,
84 m_pCurrentLayer->m_Matrix);
85 return;
86 }
87 is_mask = true;
88 }
89 if (m_pRenderStatus->ContinueSingleObject(
90 pCurObj, m_pCurrentLayer->m_Matrix, pPause)) {
91 return;
92 }
93 if (pCurObj->IsImage() && m_pRenderStatus->GetRenderOptions()
94 .GetOptions()
95 .bLimitedImageCache) {
96 m_pContext->GetPageCache()->CacheOptimization(
97 m_pRenderStatus->GetRenderOptions().GetCacheSizeLimit());
98 }
99 if (pCurObj->IsForm() || pCurObj->IsShading())
100 nObjsToGo = 0;
101 else
102 --nObjsToGo;
103 }
104 m_LastObjectRendered = iter;
105 if (nObjsToGo == 0) {
106 if (pPause && pPause->NeedToPauseNow())
107 return;
108 nObjsToGo = kStepLimit;
109 }
110 ++iter;
111 if (is_mask && iter != iterEnd)
112 return;
113 }
114 if (m_pCurrentLayer->m_pObjectHolder->GetParseState() ==
115 CPDF_PageObjectHolder::ParseState::kParsed) {
116 m_pRenderStatus.reset();
117 m_pDevice->RestoreState(false);
118 m_pCurrentLayer = nullptr;
119 m_LayerIndex++;
120 if (is_mask || (pPause && pPause->NeedToPauseNow()))
121 return;
122 } else if (is_mask) {
123 return;
124 } else {
125 m_pCurrentLayer->m_pObjectHolder->ContinueParse(pPause);
126 if (m_pCurrentLayer->m_pObjectHolder->GetParseState() !=
127 CPDF_PageObjectHolder::ParseState::kParsed) {
128 return;
129 }
130 }
131 }
132 }
133