// Copyright 2016 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/fpdfapi/render/cpdf_imagerenderer.h"

#include <math.h>

#include <algorithm>
#include <memory>
#include <utility>

#include "build/build_config.h"
#include "core/fpdfapi/page/cpdf_dib.h"
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_image.h"
#include "core/fpdfapi/page/cpdf_imageloader.h"
#include "core/fpdfapi/page/cpdf_imageobject.h"
#include "core/fpdfapi/page/cpdf_occontext.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageimagecache.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/page/cpdf_shadingpattern.h"
#include "core/fpdfapi/page/cpdf_tilingpattern.h"
#include "core/fpdfapi/page/cpdf_transferfunc.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fpdfapi/render/cpdf_rendercontext.h"
#include "core/fpdfapi/render/cpdf_renderstatus.h"
#include "core/fxcrt/check.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/maybe_owned.h"
#include "core/fxcrt/zip.h"
#include "core/fxge/cfx_defaultrenderdevice.h"
#include "core/fxge/cfx_fillrenderoptions.h"
#include "core/fxge/cfx_gemodule.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/dib/cfx_dibbase.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/cfx_imagestretcher.h"

#if BUILDFLAG(IS_WIN)
#include "core/fxge/dib/cfx_imagetransformer.h"
#endif

namespace {

bool IsImageValueTooBig(int val) {
  // Likely large enough for any real rendering need, but sufficiently small
  // that operations like val1 + val2 or -val will not overflow.
  static constexpr int kLimit = 256 * 1024 * 1024;
  FX_SAFE_INT32 safe_val = val;
  safe_val = safe_val.Abs();
  return safe_val.ValueOrDefault(kLimit) >= kLimit;
}

}  // namespace

CPDF_ImageRenderer::CPDF_ImageRenderer(CPDF_RenderStatus* pStatus)
    : render_status_(pStatus), loader_(std::make_unique<CPDF_ImageLoader>()) {}

CPDF_ImageRenderer::~CPDF_ImageRenderer() = default;

bool CPDF_ImageRenderer::StartLoadDIBBase() {
  if (!GetUnitRect().has_value()) {
    return false;
  }

  if (!loader_->Start(
          image_object_, render_status_->GetContext()->GetPageCache(),
          render_status_->GetFormResource(), render_status_->GetPageResource(),
          std_cs_, render_status_->GetGroupFamily(),
          render_status_->GetLoadMask(),
          {render_status_->GetRenderDevice()->GetWidth(),
           render_status_->GetRenderDevice()->GetHeight()})) {
    return false;
  }
  mode_ = Mode::kDefault;
  return true;
}

bool CPDF_ImageRenderer::StartRenderDIBBase() {
  if (!loader_->GetBitmap()) {
    return false;
  }

  CPDF_GeneralState& state = image_object_->mutable_general_state();
  alpha_ = state.GetFillAlpha();
  dibbase_ = loader_->GetBitmap();
  if (GetRenderOptions().ColorModeIs(CPDF_RenderOptions::kAlpha) &&
      !loader_->GetMask()) {
    return StartBitmapAlpha();
  }
  RetainPtr<const CPDF_Object> pTR = state.GetTR();
  if (pTR) {
    if (!state.GetTransferFunc()) {
      state.SetTransferFunc(render_status_->GetTransferFunc(std::move(pTR)));
    }

    if (state.GetTransferFunc() && !state.GetTransferFunc()->GetIdentity()) {
      dibbase_ = loader_->TranslateImage(state.GetTransferFunc());
    }
  }
  fill_argb_ = 0;
  pattern_color_ = false;
  pattern_ = nullptr;
  if (dibbase_->IsMaskFormat()) {
    const CPDF_Color* pColor = image_object_->color_state().GetFillColor();
    if (pColor && pColor->IsPattern()) {
      pattern_ = pColor->GetPattern();
      if (pattern_) {
        pattern_color_ = true;
      }
    }
    fill_argb_ = render_status_->GetFillArgb(image_object_);
  } else if (GetRenderOptions().ColorModeIs(CPDF_RenderOptions::kGray)) {
    RetainPtr<CFX_DIBitmap> pClone = dibbase_->Realize();
    if (!pClone) {
      return false;
    }

    pClone->ConvertColorScale(/*is_white_on_black=*/true);
    dibbase_ = pClone;
  }
  resample_options_ = FXDIB_ResampleOptions();
  if (GetRenderOptions().GetOptions().bForceHalftone) {
    resample_options_.bHalftone = true;
  }

#if BUILDFLAG(IS_WIN)
  if (render_status_->GetRenderDevice()->GetDeviceType() ==
      DeviceType::kPrinter) {
    HandleFilters();
  }
#endif

  if (GetRenderOptions().GetOptions().bNoImageSmooth) {
    resample_options_.bNoSmoothing = true;
  } else if (image_object_->GetImage()->IsInterpol()) {
    resample_options_.bInterpolateBilinear = true;
  }

  if (loader_->GetMask()) {
    return DrawMaskedImage();
  }

  if (pattern_color_) {
    return DrawPatternImage();
  }

  if (alpha_ != 1.0f || !state.HasRef() || !state.GetFillOP() ||
      state.GetOPMode() != 0 || state.GetBlendType() != BlendMode::kNormal ||
      state.GetStrokeAlpha() != 1.0f || state.GetFillAlpha() != 1.0f) {
    return StartDIBBase();
  }
  CPDF_Document* document = nullptr;
  CPDF_Page* pPage = nullptr;
  if (auto* pPageCache = render_status_->GetContext()->GetPageCache()) {
    pPage = pPageCache->GetPage();
    document = pPage->GetDocument();
  } else {
    document = image_object_->GetImage()->GetDocument();
  }
  RetainPtr<const CPDF_Dictionary> pPageResources =
      pPage ? pPage->GetPageResources() : nullptr;
  RetainPtr<const CPDF_Dictionary> pStreamDict =
      image_object_->GetImage()->GetStream()->GetDict();
  RetainPtr<const CPDF_Object> pCSObj =
      pStreamDict->GetDirectObjectFor("ColorSpace");
  auto* pData = CPDF_DocPageData::FromDocument(document);
  RetainPtr<CPDF_ColorSpace> pColorSpace =
      pData->GetColorSpace(pCSObj.Get(), pPageResources);
  if (pColorSpace) {
    CPDF_ColorSpace::Family format = pColorSpace->GetFamily();
    if (format == CPDF_ColorSpace::Family::kDeviceCMYK ||
        format == CPDF_ColorSpace::Family::kSeparation ||
        format == CPDF_ColorSpace::Family::kDeviceN) {
      blend_type_ = BlendMode::kDarken;
    }
  }
  return StartDIBBase();
}

bool CPDF_ImageRenderer::Start(CPDF_ImageObject* pImageObject,
                               const CFX_Matrix& mtObj2Device,
                               bool bStdCS) {
  DCHECK(pImageObject);
  std_cs_ = bStdCS;
  image_object_ = pImageObject;
  blend_type_ = BlendMode::kNormal;
  obj_to_device_ = mtObj2Device;
  RetainPtr<const CPDF_Dictionary> pOC = image_object_->GetImage()->GetOC();
  if (pOC && !GetRenderOptions().CheckOCGDictVisible(pOC)) {
    return false;
  }

  image_matrix_ = image_object_->matrix() * mtObj2Device;
  if (StartLoadDIBBase()) {
    return true;
  }

  return StartRenderDIBBase();
}

bool CPDF_ImageRenderer::Start(RetainPtr<CFX_DIBBase> pDIBBase,
                               FX_ARGB bitmap_argb,
                               const CFX_Matrix& mtImage2Device,
                               const FXDIB_ResampleOptions& options,
                               bool bStdCS) {
  dibbase_ = std::move(pDIBBase);
  fill_argb_ = bitmap_argb;
  alpha_ = 1.0f;
  image_matrix_ = mtImage2Device;
  resample_options_ = options;
  std_cs_ = bStdCS;
  blend_type_ = BlendMode::kNormal;
  return StartDIBBase();
}

#if BUILDFLAG(IS_WIN)
bool CPDF_ImageRenderer::IsPrinting() const {
  if (!render_status_->IsPrint()) {
    return false;
  }

  // Make sure the assumption that no printer device supports blend mode holds.
  CHECK(!render_status_->GetRenderDevice()->RenderCapBlendMode());
  return true;
}

void CPDF_ImageRenderer::HandleFilters() {
  std::optional<DecoderArray> decoder_array =
      GetDecoderArray(image_object_->GetImage()->GetStream()->GetDict());
  if (!decoder_array.has_value()) {
    return;
  }

  for (const auto& decoder : decoder_array.value()) {
    if (decoder.first == "DCTDecode" || decoder.first == "JPXDecode") {
      resample_options_.bLossy = true;
      return;
    }
  }
}
#endif  // BUILDFLAG(IS_WIN)

FX_RECT CPDF_ImageRenderer::GetDrawRect() const {
  FX_RECT rect = image_matrix_.GetUnitRect().GetOuterRect();
  rect.Intersect(render_status_->GetRenderDevice()->GetClipBox());
  return rect;
}

CFX_Matrix CPDF_ImageRenderer::GetDrawMatrix(const FX_RECT& rect) const {
  CFX_Matrix new_matrix = image_matrix_;
  new_matrix.Translate(-rect.left, -rect.top);
  return new_matrix;
}

RetainPtr<const CFX_DIBitmap> CPDF_ImageRenderer::CalculateDrawImage(
    CFX_DefaultRenderDevice& bitmap_device,
    RetainPtr<CFX_DIBBase> pDIBBase,
    const CFX_Matrix& mtNewMatrix,
    const FX_RECT& rect) const {
  auto mask_bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
  if (!mask_bitmap->Create(rect.Width(), rect.Height(),
                           FXDIB_Format::k8bppRgb)) {
    return nullptr;
  }

  {
    // Limit the scope of `mask_device`, so its dtor can flush out pending
    // operations, if any, to `mask_bitmap`.
    CFX_DefaultRenderDevice mask_device;
    CHECK(mask_device.Attach(mask_bitmap));

    CPDF_RenderStatus mask_status(render_status_->GetContext(), &mask_device);
    mask_status.SetDropObjects(render_status_->GetDropObjects());
    mask_status.SetStdCS(true);
    mask_status.Initialize(nullptr, nullptr);

    CPDF_ImageRenderer mask_renderer(&mask_status);
    if (mask_renderer.Start(std::move(pDIBBase), 0xffffffff, mtNewMatrix,
                            resample_options_, true)) {
      mask_renderer.Continue(nullptr);
    }
    if (loader_->MatteColor() != 0xffffffff) {
      const int matte_r = FXARGB_R(loader_->MatteColor());
      const int matte_g = FXARGB_G(loader_->MatteColor());
      const int matte_b = FXARGB_B(loader_->MatteColor());
      RetainPtr<CFX_DIBitmap> dest_bitmap = bitmap_device.GetBitmap();
      for (int row = 0; row < rect.Height(); row++) {
        auto mask_scan = mask_bitmap->GetScanline(row).first(
            static_cast<size_t>(rect.Width()));
        auto dest_scan =
            dest_bitmap->GetWritableScanlineAs<FX_BGRA_STRUCT<uint8_t>>(row);
        for (auto [mask_ref, dest_ref] : fxcrt::Zip(mask_scan, dest_scan)) {
          if (mask_ref == 0) {
            continue;
          }
          int orig_b = (dest_ref.blue - matte_b) * 255 / mask_ref + matte_b;
          int orig_g = (dest_ref.green - matte_g) * 255 / mask_ref + matte_g;
          int orig_r = (dest_ref.red - matte_r) * 255 / mask_ref + matte_r;
          dest_ref.blue = std::clamp(orig_b, 0, 255);
          dest_ref.green = std::clamp(orig_g, 0, 255);
          dest_ref.red = std::clamp(orig_r, 0, 255);
        }
      }
    }
  }
  CHECK(!mask_bitmap->HasPalette());
  mask_bitmap->ConvertFormat(FXDIB_Format::k8bppMask);
  return mask_bitmap;
}

const CPDF_RenderOptions& CPDF_ImageRenderer::GetRenderOptions() const {
  return render_status_->GetRenderOptions();
}

bool CPDF_ImageRenderer::DrawPatternImage() {
#if BUILDFLAG(IS_WIN)
  if (IsPrinting()) {
    result_ = false;
    return false;
  }
#endif

  FX_RECT rect = GetDrawRect();
  if (rect.IsEmpty()) {
    return false;
  }

  CFX_Matrix new_matrix = GetDrawMatrix(rect);
  CFX_DefaultRenderDevice bitmap_device;
  if (!bitmap_device.Create(rect.Width(), rect.Height(), FXDIB_Format::kBgra)) {
    return true;
  }

  CPDF_RenderStatus bitmap_status(render_status_->GetContext(), &bitmap_device);
  bitmap_status.SetOptions(GetRenderOptions());
  bitmap_status.SetDropObjects(render_status_->GetDropObjects());
  bitmap_status.SetStdCS(true);
  bitmap_status.Initialize(nullptr, nullptr);

  CFX_Matrix pattern_matrix = obj_to_device_;
  pattern_matrix.Translate(-rect.left, -rect.top);
  if (CPDF_TilingPattern* pTilingPattern = pattern_->AsTilingPattern()) {
    bitmap_status.DrawTilingPattern(pTilingPattern, image_object_,
                                    pattern_matrix, false);
  } else if (CPDF_ShadingPattern* pShadingPattern =
                 pattern_->AsShadingPattern()) {
    bitmap_status.DrawShadingPattern(pShadingPattern, image_object_,
                                     pattern_matrix, false);
  }

  RetainPtr<const CFX_DIBitmap> mask_bitmap =
      CalculateDrawImage(bitmap_device, dibbase_, new_matrix, rect);
  if (!mask_bitmap) {
    return true;
  }

  bitmap_device.GetBitmap()->MultiplyAlphaMask(std::move(mask_bitmap));
  render_status_->GetRenderDevice()->SetDIBitsWithBlend(
      bitmap_device.GetBitmap(), rect.left, rect.top, blend_type_);
  return false;
}

bool CPDF_ImageRenderer::DrawMaskedImage() {
#if BUILDFLAG(IS_WIN)
  if (IsPrinting()) {
    result_ = false;
    return false;
  }
#endif

  FX_RECT rect = GetDrawRect();
  if (rect.IsEmpty()) {
    return false;
  }

  CFX_Matrix new_matrix = GetDrawMatrix(rect);
  CFX_DefaultRenderDevice bitmap_device;
  if (!bitmap_device.Create(rect.Width(), rect.Height(), FXDIB_Format::kBgrx)) {
    return true;
  }
  bitmap_device.Clear(0xffffffff);
  CPDF_RenderStatus bitmap_status(render_status_->GetContext(), &bitmap_device);
  bitmap_status.SetDropObjects(render_status_->GetDropObjects());
  bitmap_status.SetStdCS(true);
  bitmap_status.Initialize(nullptr, nullptr);
  CPDF_ImageRenderer bitmap_renderer(&bitmap_status);
  if (bitmap_renderer.Start(dibbase_, 0, new_matrix, resample_options_, true)) {
    bitmap_renderer.Continue(nullptr);
  }
  RetainPtr<const CFX_DIBitmap> mask_bitmap =
      CalculateDrawImage(bitmap_device, loader_->GetMask(), new_matrix, rect);
  if (!mask_bitmap) {
    return true;
  }

#if defined(PDF_USE_SKIA)
  if (CFX_GEModule::Get()->UseSkiaRenderer() &&
      render_status_->GetRenderDevice()->SetBitsWithMask(
          bitmap_device.GetBitmap(), mask_bitmap, rect.left, rect.top, alpha_,
          blend_type_)) {
    return false;
  }
#endif
  bitmap_device.GetBitmap()->MultiplyAlphaMask(std::move(mask_bitmap));
  bitmap_device.GetBitmap()->MultiplyAlpha(alpha_);
  render_status_->GetRenderDevice()->SetDIBitsWithBlend(
      bitmap_device.GetBitmap(), rect.left, rect.top, blend_type_);
  return false;
}

bool CPDF_ImageRenderer::StartDIBBase() {
  if (dibbase_->GetBPP() > 1) {
    FX_SAFE_SIZE_T image_size = dibbase_->GetBPP();
    image_size /= 8;
    image_size *= dibbase_->GetWidth();
    image_size *= dibbase_->GetHeight();
    if (!image_size.IsValid()) {
      return false;
    }

    if (image_size.ValueOrDie() > kHugeImageSize &&
        !resample_options_.bHalftone) {
      resample_options_.bInterpolateBilinear = true;
    }
  }
  RenderDeviceDriverIface::StartResult result =
      render_status_->GetRenderDevice()->StartDIBitsWithBlend(
          dibbase_, alpha_, fill_argb_, image_matrix_, resample_options_,
          blend_type_);
  if (result.result == RenderDeviceDriverIface::Result::kSuccess) {
    continuation_ = std::move(result.continuation);
    if (continuation_) {
      mode_ = Mode::kBlend;
      return true;
    }
    return false;
  }

#if BUILDFLAG(IS_WIN)
  if (result.result == RenderDeviceDriverIface::Result::kNotSupported) {
    return StartDIBBaseFallback();
  }
#endif

  CHECK_EQ(result.result, RenderDeviceDriverIface::Result::kFailure);
  result_ = false;
  return false;
}

#if BUILDFLAG(IS_WIN)
bool CPDF_ImageRenderer::StartDIBBaseFallback() {
  if ((fabs(image_matrix_.b) >= 0.5f || image_matrix_.a == 0) ||
      (fabs(image_matrix_.c) >= 0.5f || image_matrix_.d == 0)) {
    if (IsPrinting()) {
      result_ = false;
      return false;
    }

    std::optional<FX_RECT> image_rect = GetUnitRect();
    if (!image_rect.has_value()) {
      return false;
    }

    FX_RECT clip_box = render_status_->GetRenderDevice()->GetClipBox();
    clip_box.Intersect(image_rect.value());
    mode_ = Mode::kTransform;
    transformer_ = std::make_unique<CFX_ImageTransformer>(
        dibbase_, image_matrix_, resample_options_, &clip_box);
    return true;
  }

  std::optional<FX_RECT> image_rect = GetUnitRect();
  if (!image_rect.has_value()) {
    return false;
  }

  int dest_left;
  int dest_top;
  int dest_width;
  int dest_height;
  if (!GetDimensionsFromUnitRect(image_rect.value(), &dest_left, &dest_top,
                                 &dest_width, &dest_height)) {
    return false;
  }

  if (dibbase_->IsOpaqueImage() && alpha_ == 1.0f) {
    if (render_status_->GetRenderDevice()->StretchDIBitsWithFlagsAndBlend(
            dibbase_, dest_left, dest_top, dest_width, dest_height,
            resample_options_, blend_type_)) {
      return false;
    }
  }
  if (dibbase_->IsMaskFormat()) {
    if (alpha_ != 1.0f) {
      fill_argb_ = FXARGB_MUL_ALPHA(fill_argb_, FXSYS_roundf(alpha_ * 255));
    }
    if (render_status_->GetRenderDevice()->StretchBitMaskWithFlags(
            dibbase_, dest_left, dest_top, dest_width, dest_height, fill_argb_,
            resample_options_)) {
      return false;
    }
  }

  if (IsPrinting()) {
    result_ = false;
    return true;
  }

  FX_RECT clip_box = render_status_->GetRenderDevice()->GetClipBox();
  FX_RECT dest_rect = clip_box;
  dest_rect.Intersect(image_rect.value());
  FX_RECT dest_clip(
      dest_rect.left - image_rect->left, dest_rect.top - image_rect->top,
      dest_rect.right - image_rect->left, dest_rect.bottom - image_rect->top);
  RetainPtr<CFX_DIBitmap> stretched = dibbase_->StretchTo(
      dest_width, dest_height, resample_options_, &dest_clip);
  if (stretched) {
    render_status_->CompositeDIBitmap(std::move(stretched), dest_rect.left,
                                      dest_rect.top, fill_argb_, alpha_,
                                      blend_type_, CPDF_Transparency());
  }
  return false;
}
#endif  // BUILDFLAG(IS_WIN)

bool CPDF_ImageRenderer::StartBitmapAlpha() {
  if (dibbase_->IsOpaqueImage()) {
    CFX_Path path;
    path.AppendRect(0, 0, 1, 1);
    path.Transform(image_matrix_);
    const int bitmap_alpha = FXSYS_roundf(alpha_ * 255);
    uint32_t fill_color =
        ArgbEncode(0xff, bitmap_alpha, bitmap_alpha, bitmap_alpha);
    render_status_->GetRenderDevice()->DrawPath(
        path, nullptr, nullptr, fill_color, 0,
        CFX_FillRenderOptions::WindingOptions());
    return false;
  }

  RetainPtr<CFX_DIBBase> alpha_mask =
      dibbase_->IsMaskFormat() ? dibbase_ : dibbase_->CloneAlphaMask();
  if (fabs(image_matrix_.b) >= 0.5f || fabs(image_matrix_.c) >= 0.5f) {
    int left;
    int top;
    alpha_mask = alpha_mask->TransformTo(image_matrix_, &left, &top);
    if (!alpha_mask) {
      return true;
    }

    const int bitmap_alpha = FXSYS_roundf(alpha_ * 255);
    render_status_->GetRenderDevice()->SetBitMask(
        std::move(alpha_mask), left, top,
        ArgbEncode(0xff, bitmap_alpha, bitmap_alpha, bitmap_alpha));
    return false;
  }

  std::optional<FX_RECT> image_rect = GetUnitRect();
  if (!image_rect.has_value()) {
    return false;
  }

  int left;
  int top;
  int dest_width;
  int dest_height;
  if (!GetDimensionsFromUnitRect(image_rect.value(), &left, &top, &dest_width,
                                 &dest_height)) {
    return false;
  }

  const int bitmap_alpha = FXSYS_roundf(alpha_ * 255);
  render_status_->GetRenderDevice()->StretchBitMask(
      std::move(alpha_mask), left, top, dest_width, dest_height,
      ArgbEncode(0xff, bitmap_alpha, bitmap_alpha, bitmap_alpha));
  return false;
}

bool CPDF_ImageRenderer::Continue(PauseIndicatorIface* pPause) {
  switch (mode_) {
    case Mode::kNone:
      return false;
    case Mode::kDefault:
      return ContinueDefault(pPause);
    case Mode::kBlend:
      return ContinueBlend(pPause);
#if BUILDFLAG(IS_WIN)
    case Mode::kTransform:
      return ContinueTransform(pPause);
#endif
  }
}

bool CPDF_ImageRenderer::ContinueDefault(PauseIndicatorIface* pPause) {
  if (loader_->Continue(pPause)) {
    return true;
  }

  if (!StartRenderDIBBase()) {
    return false;
  }

  if (mode_ == Mode::kDefault) {
    return false;
  }

  return Continue(pPause);
}

bool CPDF_ImageRenderer::ContinueBlend(PauseIndicatorIface* pPause) {
  return render_status_->GetRenderDevice()->ContinueDIBits(continuation_.get(),
                                                           pPause);
}

#if BUILDFLAG(IS_WIN)
bool CPDF_ImageRenderer::ContinueTransform(PauseIndicatorIface* pPause) {
  if (transformer_->Continue(pPause)) {
    return true;
  }

  RetainPtr<CFX_DIBitmap> bitmap = transformer_->DetachBitmap();
  if (!bitmap) {
    return false;
  }

  if (bitmap->IsMaskFormat()) {
    if (alpha_ != 1.0f) {
      fill_argb_ = FXARGB_MUL_ALPHA(fill_argb_, FXSYS_roundf(alpha_ * 255));
    }
    result_ = render_status_->GetRenderDevice()->SetBitMask(
        std::move(bitmap), transformer_->result().left,
        transformer_->result().top, fill_argb_);
  } else {
    bitmap->MultiplyAlpha(alpha_);
    result_ = render_status_->GetRenderDevice()->SetDIBitsWithBlend(
        std::move(bitmap), transformer_->result().left,
        transformer_->result().top, blend_type_);
  }
  return false;
}
#endif  // BUILDFLAG(IS_WIN)

std::optional<FX_RECT> CPDF_ImageRenderer::GetUnitRect() const {
  CFX_FloatRect image_rect_f = image_matrix_.GetUnitRect();
  FX_RECT image_rect = image_rect_f.GetOuterRect();
  if (!image_rect.Valid()) {
    return std::nullopt;
  }
  return image_rect;
}

bool CPDF_ImageRenderer::GetDimensionsFromUnitRect(const FX_RECT& rect,
                                                   int* left,
                                                   int* top,
                                                   int* width,
                                                   int* height) const {
  DCHECK(rect.Valid());

  int dest_width = rect.Width();
  int dest_height = rect.Height();
  if (IsImageValueTooBig(dest_width) || IsImageValueTooBig(dest_height)) {
    return false;
  }

  if (image_matrix_.a < 0) {
    dest_width = -dest_width;
  }

  if (image_matrix_.d > 0) {
    dest_height = -dest_height;
  }

  int dest_left = dest_width > 0 ? rect.left : rect.right;
  int dest_top = dest_height > 0 ? rect.top : rect.bottom;
  if (IsImageValueTooBig(dest_left) || IsImageValueTooBig(dest_top)) {
    return false;
  }

  *left = dest_left;
  *top = dest_top;
  *width = dest_width;
  *height = dest_height;
  return true;
}
