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