chromium/third_party/pdfium/core/fxge/dib/cstretchengine.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/cstretchengine.h"

#include <math.h>

#include <algorithm>
#include <type_traits>
#include <utility>

#include "core/fxcrt/check.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/pauseindicator_iface.h"
#include "core/fxge/calculate_pitch.h"
#include "core/fxge/dib/cfx_dibbase.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/fx_dib.h"
#include "core/fxge/dib/scanlinecomposer_iface.h"

static_assert …;

namespace {

size_t TotalBytesForWeightCount(size_t weight_count) { … }

}  // namespace

// static
bool CStretchEngine::UseInterpolateBilinear(
    const FXDIB_ResampleOptions& options,
    int dest_width,
    int dest_height,
    int src_width,
    int src_height) { … }

CStretchEngine::WeightTable::WeightTable() = default;

CStretchEngine::WeightTable::~WeightTable() = default;

bool CStretchEngine::WeightTable::CalculateWeights(
    int dest_len,
    int dest_min,
    int dest_max,
    int src_len,
    int src_min,
    int src_max,
    const FXDIB_ResampleOptions& options) { … }

const CStretchEngine::PixelWeight* CStretchEngine::WeightTable::GetPixelWeight(
    int pixel) const { … }

CStretchEngine::PixelWeight* CStretchEngine::WeightTable::GetPixelWeight(
    int pixel) { … }

CStretchEngine::CStretchEngine(ScanlineComposerIface* pDestBitmap,
                               FXDIB_Format dest_format,
                               int dest_width,
                               int dest_height,
                               const FX_RECT& clip_rect,
                               const RetainPtr<const CFX_DIBBase>& pSrcBitmap,
                               const FXDIB_ResampleOptions& options)
    : … { … }

CStretchEngine::~CStretchEngine() = default;

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

bool CStretchEngine::StartStretchHorz() { … }

bool CStretchEngine::ContinueStretchHorz(PauseIndicatorIface* pPause) { … }

void CStretchEngine::StretchVert() { … }