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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfapi/render/cpdf_progressiverenderer.h"
#include "core/fpdfapi/page/cpdf_image.h"
#include "core/fpdfapi/page/cpdf_imageobject.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/page/cpdf_pageobjectholder.h"
#include "core/fpdfapi/render/cpdf_pagerendercache.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fpdfapi/render/cpdf_renderstatus.h"
#include "core/fxge/cfx_renderdevice.h"
#include "third_party/base/ptr_util.h"
CPDF_ProgressiveRenderer::CPDF_ProgressiveRenderer(
CPDF_RenderContext* pContext,
CFX_RenderDevice* pDevice,
const CPDF_RenderOptions* pOptions)
: m_Status(Ready),
m_pContext(pContext),
m_pDevice(pDevice),
m_pOptions(pOptions),
m_LayerIndex(0),
m_pCurrentLayer(nullptr) {}
CPDF_ProgressiveRenderer::~CPDF_ProgressiveRenderer() {
if (m_pRenderStatus)
m_pDevice->RestoreState(false);
}
void CPDF_ProgressiveRenderer::Start(IFX_Pause* pPause) {
if (!m_pContext || !m_pDevice || m_Status != Ready) {
m_Status = Failed;
return;
}
m_Status = ToBeContinued;
Continue(pPause);
}
void CPDF_ProgressiveRenderer::Continue(IFX_Pause* pPause) {
while (m_Status == ToBeContinued) {
if (!m_pCurrentLayer) {
if (m_LayerIndex >= m_pContext->CountLayers()) {
m_Status = Done;
return;
}
m_pCurrentLayer = m_pContext->GetLayer(m_LayerIndex);
m_LastObjectRendered =
m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
m_pRenderStatus = pdfium::MakeUnique<CPDF_RenderStatus>();
m_pRenderStatus->Initialize(
m_pContext, m_pDevice, nullptr, nullptr, nullptr, nullptr, m_pOptions,
m_pCurrentLayer->m_pObjectHolder->m_Transparency, false, nullptr);
m_pDevice->SaveState();
m_ClipRect = CFX_FloatRect(m_pDevice->GetClipBox());
CFX_Matrix device2object;
device2object.SetReverse(m_pCurrentLayer->m_Matrix);
device2object.TransformRect(m_ClipRect);
}
CPDF_PageObjectList::iterator iter;
CPDF_PageObjectList::iterator iterEnd =
m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->end();
if (m_LastObjectRendered != iterEnd) {
iter = m_LastObjectRendered;
++iter;
} else {
iter = m_pCurrentLayer->m_pObjectHolder->GetPageObjectList()->begin();
}
int nObjsToGo = kStepLimit;
while (iter != iterEnd) {
CPDF_PageObject* pCurObj = iter->get();
if (pCurObj && pCurObj->m_Left <= m_ClipRect.right &&
pCurObj->m_Right >= m_ClipRect.left &&
pCurObj->m_Bottom <= m_ClipRect.top &&
pCurObj->m_Top >= m_ClipRect.bottom) {
if (m_pRenderStatus->ContinueSingleObject(
pCurObj, &m_pCurrentLayer->m_Matrix, pPause)) {
return;
}
if (pCurObj->IsImage() &&
m_pRenderStatus->m_Options.m_Flags & RENDER_LIMITEDIMAGECACHE) {
m_pContext->GetPageCache()->CacheOptimization(
m_pRenderStatus->m_Options.m_dwLimitCacheSize);
}
if (pCurObj->IsForm() || pCurObj->IsShading())
nObjsToGo = 0;
else
--nObjsToGo;
}
m_LastObjectRendered = iter;
if (nObjsToGo == 0) {
if (pPause && pPause->NeedToPauseNow())
return;
nObjsToGo = kStepLimit;
}
if (pCurObj->IsImage() && pCurObj->AsImage()->GetImage()->IsMask() &&
(m_pOptions->m_Flags & RENDER_BREAKFORMASKS)) {
return;
}
++iter;
}
if (m_pCurrentLayer->m_pObjectHolder->IsParsed()) {
m_pRenderStatus.reset();
m_pDevice->RestoreState(false);
m_pCurrentLayer = nullptr;
m_LayerIndex++;
if (pPause && pPause->NeedToPauseNow()) {
return;
}
} else {
m_pCurrentLayer->m_pObjectHolder->ContinueParse(pPause);
if (!m_pCurrentLayer->m_pObjectHolder->IsParsed())
return;
}
}
}
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