chromium/third_party/pdfium/core/fxge/dib/cfx_imagestretcher.cpp

// Copyright 2017 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 "core/fxge/dib/cfx_imagestretcher.h"

#include <utility>

#include "core/fxcrt/check.h"
#include "core/fxcrt/check_op.h"
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/span.h"
#include "core/fxge/dib/cfx_dibbase.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/cstretchengine.h"
#include "core/fxge/dib/fx_dib.h"

namespace {

const int kMaxProgressiveStretchPixels = …;

bool SourceSizeWithinLimit(int width, int height) { … }

FXDIB_Format GetStretchedFormat(const CFX_DIBBase& src) { … }

// Builds a new palette with a size of `CFX_DIBBase::kPaletteSize` from the
// existing palette in `source`.
DataVector<uint32_t> BuildPaletteFrom1BppSource(
    const RetainPtr<const CFX_DIBBase>& source) { … }

}  // namespace

CFX_ImageStretcher::CFX_ImageStretcher(ScanlineComposerIface* pDest,
                                       RetainPtr<const CFX_DIBBase> source,
                                       int dest_width,
                                       int dest_height,
                                       const FX_RECT& bitmap_rect,
                                       const FXDIB_ResampleOptions& options)
    : … { … }

CFX_ImageStretcher::~CFX_ImageStretcher() = default;

bool CFX_ImageStretcher::Start() { … }

bool CFX_ImageStretcher::Continue(PauseIndicatorIface* pPause) { … }

RetainPtr<const CFX_DIBBase> CFX_ImageStretcher::source() { … }

bool CFX_ImageStretcher::StartStretch() { … }

bool CFX_ImageStretcher::ContinueStretch(PauseIndicatorIface* pPause) { … }