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