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      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/ifx_pauseindicator.h"
     17 #include "core/fxge/cfx_renderdevice.h"
     18 #include "third_party/base/ptr_util.h"
     19 
     20 CPDF_ProgressiveRenderer::CPDF_ProgressiveRenderer(
     21     CPDF_RenderContext* pContext,
     22     CFX_RenderDevice* pDevice,
     23     const CPDF_RenderOptions* pOptions)
     24     : m_Status(Ready),
     25       m_pContext(pContext),
     26       m_pDevice(pDevice),
     27       m_pOptions(pOptions),
     28       m_LayerIndex(0),
     29       m_pCurrentLayer(nullptr) {}
     30 
     31 CPDF_ProgressiveRenderer::~CPDF_ProgressiveRenderer() {
     32   if (m_pRenderStatus) {
     33     m_pRenderStatus.reset();  // Release first.
     34     m_pDevice->RestoreState(false);
     35   }
     36 }
     37 
     38 void CPDF_ProgressiveRenderer::Start(IFX_PauseIndicator* pPause) {
     39   if (!m_pContext || !m_pDevice || m_Status != Ready) {
     40     m_Status = Failed;
     41     return;
     42   }
     43   m_Status = ToBeContinued;
     44   Continue(pPause);
     45 }
     46 
     47 void CPDF_ProgressiveRenderer::Continue(IFX_PauseIndicator* pPause) {
     48   while (m_Status == ToBeContinued) {
     49     if (!m_pCurrentLayer) {
     50       if (m_LayerIndex >= m_pContext->CountLayers()) {
     51         m_Status = Done;
     52         return;
     53       }
     54       m_pCurrentLayer = m_pContext->GetLayer(m_LayerIndex);
     55       m_LastObjectRendered =
     56           m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
     57       m_pRenderStatus = pdfium::MakeUnique<CPDF_RenderStatus>();
     58       m_pRenderStatus->Initialize(
     59           m_pContext.Get(), m_pDevice.Get(), nullptr, nullptr, nullptr, nullptr,
     60           m_pOptions, m_pCurrentLayer->m_pObjectHolder->m_iTransparency, false,
     61           nullptr);
     62       m_pDevice->SaveState();
     63       m_ClipRect = m_pCurrentLayer->m_Matrix.GetInverse().TransformRect(
     64           CFX_FloatRect(m_pDevice->GetClipBox()));
     65     }
     66     CPDF_PageObjectList::iterator iter;
     67     CPDF_PageObjectList::iterator iterEnd =
     68         m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
     69     if (m_LastObjectRendered != iterEnd) {
     70       iter = m_LastObjectRendered;
     71       ++iter;
     72     } else {
     73       iter = m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->begin();
     74     }
     75     int nObjsToGo = kStepLimit;
     76     bool is_mask = false;
     77     while (iter != iterEnd) {
     78       CPDF_PageObject* pCurObj = iter->get();
     79       if (pCurObj && pCurObj->m_Left <= m_ClipRect.right &&
     80           pCurObj->m_Right >= m_ClipRect.left &&
     81           pCurObj->m_Bottom <= m_ClipRect.top &&
     82           pCurObj->m_Top >= m_ClipRect.bottom) {
     83         if (m_pOptions->HasFlag(RENDER_BREAKFORMASKS) && pCurObj->IsImage() &&
     84             pCurObj->AsImage()->GetImage()->IsMask()) {
     85           if (m_pDevice->GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
     86             m_LastObjectRendered = iter;
     87             m_pRenderStatus->ProcessClipPath(pCurObj->m_ClipPath,
     88                                              &m_pCurrentLayer->m_Matrix);
     89             return;
     90           }
     91           is_mask = true;
     92         }
     93         if (m_pRenderStatus->ContinueSingleObject(
     94                 pCurObj, &m_pCurrentLayer->m_Matrix, pPause)) {
     95           return;
     96         }
     97         if (pCurObj->IsImage() && m_pRenderStatus->GetRenderOptions()->HasFlag(
     98                                       RENDER_LIMITEDIMAGECACHE)) {
     99           m_pContext->GetPageCache()->CacheOptimization(
    100               m_pRenderStatus->GetRenderOptions()->GetCacheSizeLimit());
    101         }
    102         if (pCurObj->IsForm() || pCurObj->IsShading())
    103           nObjsToGo = 0;
    104         else
    105           --nObjsToGo;
    106       }
    107       m_LastObjectRendered = iter;
    108       if (nObjsToGo == 0) {
    109         if (pPause && pPause->NeedToPauseNow())
    110           return;
    111         nObjsToGo = kStepLimit;
    112       }
    113       ++iter;
    114       if (is_mask && iter != iterEnd)
    115         return;
    116     }
    117     if (m_pCurrentLayer->m_pObjectHolder->IsParsed()) {
    118       m_pRenderStatus.reset();
    119       m_pDevice->RestoreState(false);
    120       m_pCurrentLayer = nullptr;
    121       m_LayerIndex++;
    122       if (is_mask || (pPause && pPause->NeedToPauseNow())) {
    123         return;
    124       }
    125     } else if (is_mask) {
    126       return;
    127     } else {
    128       m_pCurrentLayer->m_pObjectHolder->ContinueParse(pPause);
    129       if (!m_pCurrentLayer->m_pObjectHolder->IsParsed())
    130         return;
    131     }
    132   }
    133 }
    134