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77 lines
2.3 KiB
77 lines
2.3 KiB
// Copyright 2019 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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#include "public/fpdf_thumbnail.h"
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#include <vector>
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#include "core/fpdfapi/page/cpdf_dib.h"
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#include "core/fpdfapi/page/cpdf_page.h"
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#include "core/fpdfapi/parser/cpdf_dictionary.h"
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#include "core/fpdfapi/parser/cpdf_stream.h"
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#include "core/fpdfapi/parser/cpdf_stream_acc.h"
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#include "core/fxge/dib/cfx_dibitmap.h"
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#include "fpdfsdk/cpdfsdk_helpers.h"
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#include "public/fpdfview.h"
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namespace {
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const CPDF_Stream* CPDFStreamForThumbnailFromPage(FPDF_PAGE page) {
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const CPDF_Page* p_page = CPDFPageFromFPDFPage(page);
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if (!p_page)
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return nullptr;
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const CPDF_Dictionary* page_dict = p_page->GetDict();
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if (!page_dict->KeyExist("Type"))
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return nullptr;
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return page_dict->GetStreamFor("Thumb");
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}
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} // namespace
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FPDF_EXPORT unsigned long FPDF_CALLCONV
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FPDFPage_GetDecodedThumbnailData(FPDF_PAGE page,
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void* buffer,
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unsigned long buflen) {
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const CPDF_Stream* thumb_stream = CPDFStreamForThumbnailFromPage(page);
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if (!thumb_stream)
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return 0u;
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return DecodeStreamMaybeCopyAndReturnLength(thumb_stream, buffer, buflen);
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}
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FPDF_EXPORT unsigned long FPDF_CALLCONV
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FPDFPage_GetRawThumbnailData(FPDF_PAGE page,
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void* buffer,
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unsigned long buflen) {
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const CPDF_Stream* thumb_stream = CPDFStreamForThumbnailFromPage(page);
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if (!thumb_stream)
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return 0u;
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return GetRawStreamMaybeCopyAndReturnLength(thumb_stream, buffer, buflen);
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}
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FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV
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FPDFPage_GetThumbnailAsBitmap(FPDF_PAGE page) {
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const CPDF_Stream* thumb_stream = CPDFStreamForThumbnailFromPage(page);
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if (!thumb_stream)
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return nullptr;
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const CPDF_Page* p_page = CPDFPageFromFPDFPage(page);
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auto p_source = pdfium::MakeRetain<CPDF_DIB>();
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const CPDF_DIB::LoadState start_status = p_source->StartLoadDIBBase(
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p_page->GetDocument(), thumb_stream, false, nullptr,
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p_page->m_pPageResources.Get(), false, 0, false);
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if (start_status == CPDF_DIB::LoadState::kFail)
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return nullptr;
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auto thumb_bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
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if (!thumb_bitmap->Copy(p_source))
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return nullptr;
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return FPDFBitmapFromCFXDIBitmap(thumb_bitmap.Leak());
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}
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