cpdfsdk_renderpage.cpp

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// Copyright 2020 The PDFium Authors
// 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 "fpdfsdk/cpdfsdk_renderpage.h"
 
#include <memory>
#include <utility>
 
#include "core/fpdfapi/page/cpdf_pageimagecache.h"
#include "core/fpdfapi/render/cpdf_pagerendercontext.h"
#include "core/fpdfapi/render/cpdf_progressiverenderer.h"
#include "core/fpdfapi/render/cpdf_renderoptions.h"
#include "core/fpdfdoc/cpdf_annotlist.h"
#include "core/fxge/cfx_renderdevice.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
#include "fpdfsdk/cpdfsdk_pauseadapter.h"
 
namespace {
 
void RenderPageImpl(CPDF_PageRenderContext* pContext,
                    CPDF_Page* pPage,
                    const CFX_Matrix& matrix,
                    const FX_RECT& clipping_rect,
                    int flags,
                    const FPDF_COLORSCHEME* color_scheme,
                    bool need_to_restore,
                    CPDFSDK_PauseAdapter* pause) {
  if (!pContext->m_pOptions)
    pContext->m_pOptions = std::make_unique<CPDF_RenderOptions>();
 
  auto& options = pContext->m_pOptions->GetOptions();
  options.bClearType = !!(flags & FPDF_LCD_TEXT);
  options.bNoNativeText = !!(flags & FPDF_NO_NATIVETEXT);
  options.bLimitedImageCache = !!(flags & FPDF_RENDER_LIMITEDIMAGECACHE);
  options.bForceHalftone = !!(flags & FPDF_RENDER_FORCEHALFTONE);
  options.bNoTextSmooth = !!(flags & FPDF_RENDER_NO_SMOOTHTEXT);
  options.bNoImageSmooth = !!(flags & FPDF_RENDER_NO_SMOOTHIMAGE);
  options.bNoPathSmooth = !!(flags & FPDF_RENDER_NO_SMOOTHPATH);
 
  // Grayscale output
  if (flags & FPDF_GRAYSCALE)
    pContext->m_pOptions->SetColorMode(CPDF_RenderOptions::kGray);
 
  if (color_scheme) {
    pContext->m_pOptions->SetColorMode(CPDF_RenderOptions::kForcedColor);
    SetColorFromScheme(color_scheme, pContext->m_pOptions.get());
    options.bConvertFillToStroke = !!(flags & FPDF_CONVERT_FILL_TO_STROKE);
  }
 
  const CPDF_OCContext::UsageType usage =
      (flags & FPDF_PRINTING) ? CPDF_OCContext::kPrint : CPDF_OCContext::kView;
  pContext->m_pOptions->SetOCContext(
      pdfium::MakeRetain<CPDF_OCContext>(pPage->GetDocument(), usage));
 
  pContext->m_pDevice->SaveState();
  pContext->m_pDevice->SetBaseClip(clipping_rect);
  pContext->m_pDevice->SetClip_Rect(clipping_rect);
  pContext->m_pContext = std::make_unique<CPDF_RenderContext>(
      pPage->GetDocument(), pPage->GetMutablePageResources(),
      pPage->GetPageImageCache());
 
  pContext->m_pContext->AppendLayer(pPage, matrix);
 
  if (flags & FPDF_ANNOT) {
    auto pOwnedList = std::make_unique<CPDF_AnnotList>(pPage);
    CPDF_AnnotList* pList = pOwnedList.get();
    pContext->m_pAnnots = std::move(pOwnedList);
    bool bPrinting =
        (flags & FPDF_PRINTING) ||
        pContext->m_pDevice->GetDeviceType() != DeviceType::kDisplay;
 
    // TODO(https://crbug.com/pdfium/993) - maybe pass true here.
    const bool bShowWidget = false;
    pList->DisplayAnnots(pPage, pContext->m_pDevice.get(),
                         pContext->m_pContext.get(), bPrinting, matrix,
                         bShowWidget);
  }
 
  pContext->m_pRenderer = std::make_unique<CPDF_ProgressiveRenderer>(
      pContext->m_pContext.get(), pContext->m_pDevice.get(),
      pContext->m_pOptions.get());
  pContext->m_pRenderer->Start(pause);
  if (need_to_restore)
    pContext->m_pDevice->RestoreState(false);
}
 
}  // namespace
 
void CPDFSDK_RenderPage(CPDF_PageRenderContext* pContext,
                        CPDF_Page* pPage,
                        const CFX_Matrix& matrix,
                        const FX_RECT& clipping_rect,
                        int flags,
                        const FPDF_COLORSCHEME* color_scheme) {
  RenderPageImpl(pContext, pPage, matrix, clipping_rect, flags, color_scheme,
                 /*need_to_restore=*/true, /*pause=*/nullptr);
}
 
void CPDFSDK_RenderPageWithContext(CPDF_PageRenderContext* pContext,
                                   CPDF_Page* pPage,
                                   int start_x,
                                   int start_y,
                                   int size_x,
                                   int size_y,
                                   int rotate,
                                   int flags,
                                   const FPDF_COLORSCHEME* color_scheme,
                                   bool need_to_restore,
                                   CPDFSDK_PauseAdapter* pause) {
  const FX_RECT rect(start_x, start_y, start_x + size_x, start_y + size_y);
  RenderPageImpl(pContext, pPage, pPage->GetDisplayMatrix(rect, rotate), rect,
                 flags, color_scheme, need_to_restore, pause);
}