Move CPDF_ImageRenderer from render_int

Review-Url: https://codereview.chromium.org/2525833002

1 files changed, 608 insertions, 0 deletions

diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
new file mode 100644
index 0000000000..6d951a8d39
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -0,0 +1,608 @@
+// Copyright 2016 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.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fpdfapi/render/cpdf_imagerenderer.h"
+
+#include <memory>
+
+#include "core/fpdfapi/page/cpdf_docpagedata.h"
+#include "core/fpdfapi/page/cpdf_image.h"
+#include "core/fpdfapi/page/cpdf_imageobject.h"
+#include "core/fpdfapi/page/cpdf_page.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/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/render/cpdf_pagerendercache.h"
+#include "core/fpdfapi/render/cpdf_rendercontext.h"
+#include "core/fpdfapi/render/cpdf_renderstatus.h"
+#include "core/fpdfapi/render/cpdf_transferfunc.h"
+#include "core/fpdfapi/render/render_int.h"
+#include "core/fpdfdoc/cpdf_occontext.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "core/fxge/cfx_fxgedevice.h"
+#include "core/fxge/cfx_pathdata.h"
+
+#ifdef _SKIA_SUPPORT_
+#include "core/fxge/skia/fx_skia_device.h"
+#endif
+
+CPDF_ImageRenderer::CPDF_ImageRenderer() {
+  m_pRenderStatus = nullptr;
+  m_pImageObject = nullptr;
+  m_Result = true;
+  m_Status = 0;
+  m_DeviceHandle = nullptr;
+  m_bStdCS = false;
+  m_bPatternColor = false;
+  m_BlendType = FXDIB_BLEND_NORMAL;
+  m_pPattern = nullptr;
+  m_pObj2Device = nullptr;
+}
+
+CPDF_ImageRenderer::~CPDF_ImageRenderer() {
+  if (m_DeviceHandle)
+    m_pRenderStatus->m_pDevice->CancelDIBits(m_DeviceHandle);
+}
+
+bool CPDF_ImageRenderer::StartLoadDIBSource() {
+  CFX_FloatRect image_rect_f = m_ImageMatrix.GetUnitRect();
+  FX_RECT image_rect = image_rect_f.GetOuterRect();
+  if (!image_rect.Valid())
+    return false;
+
+  int dest_width = image_rect.Width();
+  int dest_height = image_rect.Height();
+  if (m_ImageMatrix.a < 0)
+    dest_width = -dest_width;
+  if (m_ImageMatrix.d > 0)
+    dest_height = -dest_height;
+  if (m_Loader.Start(
+          m_pImageObject, m_pRenderStatus->m_pContext->GetPageCache(), m_bStdCS,
+          m_pRenderStatus->m_GroupFamily, m_pRenderStatus->m_bLoadMask,
+          m_pRenderStatus, dest_width, dest_height)) {
+    m_Status = 4;
+    return true;
+  }
+  return false;
+}
+
+bool CPDF_ImageRenderer::StartRenderDIBSource() {
+  if (!m_Loader.m_pBitmap)
+    return false;
+
+  m_BitmapAlpha =
+      FXSYS_round(255 * m_pImageObject->m_GeneralState.GetFillAlpha());
+  m_pDIBSource = m_Loader.m_pBitmap;
+  if (m_pRenderStatus->m_Options.m_ColorMode == RENDER_COLOR_ALPHA &&
+      !m_Loader.m_pMask) {
+    return StartBitmapAlpha();
+  }
+  if (m_pImageObject->m_GeneralState.GetTR()) {
+    if (!m_pImageObject->m_GeneralState.GetTransferFunc()) {
+      m_pImageObject->m_GeneralState.SetTransferFunc(
+          m_pRenderStatus->GetTransferFunc(
+              m_pImageObject->m_GeneralState.GetTR()));
+    }
+    if (m_pImageObject->m_GeneralState.GetTransferFunc() &&
+        !m_pImageObject->m_GeneralState.GetTransferFunc()->m_bIdentity) {
+      m_pDIBSource = m_Loader.m_pBitmap =
+          m_pImageObject->m_GeneralState.GetTransferFunc()->TranslateImage(
+              m_Loader.m_pBitmap, !m_Loader.m_bCached);
+      if (m_Loader.m_bCached && m_Loader.m_pMask)
+        m_Loader.m_pMask = m_Loader.m_pMask->Clone();
+      m_Loader.m_bCached = false;
+    }
+  }
+  m_FillArgb = 0;
+  m_bPatternColor = false;
+  m_pPattern = nullptr;
+  if (m_pDIBSource->IsAlphaMask()) {
+    const CPDF_Color* pColor = m_pImageObject->m_ColorState.GetFillColor();
+    if (pColor && pColor->IsPattern()) {
+      m_pPattern = pColor->GetPattern();
+      if (m_pPattern)
+        m_bPatternColor = true;
+    }
+    m_FillArgb = m_pRenderStatus->GetFillArgb(m_pImageObject);
+  } else if (m_pRenderStatus->m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
+    m_pClone.reset(m_pDIBSource->Clone());
+    m_pClone->ConvertColorScale(m_pRenderStatus->m_Options.m_BackColor,
+                                m_pRenderStatus->m_Options.m_ForeColor);
+    m_pDIBSource = m_pClone.get();
+  }
+  m_Flags = 0;
+  if (m_pRenderStatus->m_Options.m_Flags & RENDER_FORCE_DOWNSAMPLE)
+    m_Flags |= RENDER_FORCE_DOWNSAMPLE;
+  else if (m_pRenderStatus->m_Options.m_Flags & RENDER_FORCE_HALFTONE)
+    m_Flags |= RENDER_FORCE_HALFTONE;
+  if (m_pRenderStatus->m_pDevice->GetDeviceClass() != FXDC_DISPLAY) {
+    CPDF_Object* pFilters =
+        m_pImageObject->GetImage()->GetStream()->GetDict()->GetDirectObjectFor(
+            "Filter");
+    if (pFilters) {
+      if (pFilters->IsName()) {
+        CFX_ByteString bsDecodeType = pFilters->GetString();
+        if (bsDecodeType == "DCTDecode" || bsDecodeType == "JPXDecode")
+          m_Flags |= FXRENDER_IMAGE_LOSSY;
+      } else if (CPDF_Array* pArray = pFilters->AsArray()) {
+        for (size_t i = 0; i < pArray->GetCount(); i++) {
+          CFX_ByteString bsDecodeType = pArray->GetStringAt(i);
+          if (bsDecodeType == "DCTDecode" || bsDecodeType == "JPXDecode") {
+            m_Flags |= FXRENDER_IMAGE_LOSSY;
+            break;
+          }
+        }
+      }
+    }
+  }
+  if (m_pRenderStatus->m_Options.m_Flags & RENDER_NOIMAGESMOOTH)
+    m_Flags |= FXDIB_NOSMOOTH;
+  else if (m_pImageObject->GetImage()->IsInterpol())
+    m_Flags |= FXDIB_INTERPOL;
+  if (m_Loader.m_pMask)
+    return DrawMaskedImage();
+
+  if (m_bPatternColor)
+    return DrawPatternImage(m_pObj2Device);
+
+  if (m_BitmapAlpha != 255 || !m_pImageObject->m_GeneralState ||
+      !m_pImageObject->m_GeneralState.GetFillOP() ||
+      m_pImageObject->m_GeneralState.GetOPMode() != 0 ||
+      m_pImageObject->m_GeneralState.GetBlendType() != FXDIB_BLEND_NORMAL ||
+      m_pImageObject->m_GeneralState.GetStrokeAlpha() != 1.0f ||
+      m_pImageObject->m_GeneralState.GetFillAlpha() != 1.0f) {
+    return StartDIBSource();
+  }
+  CPDF_Document* pDocument = nullptr;
+  CPDF_Page* pPage = nullptr;
+  if (m_pRenderStatus->m_pContext->GetPageCache()) {
+    pPage = m_pRenderStatus->m_pContext->GetPageCache()->GetPage();
+    pDocument = pPage->m_pDocument;
+  } else {
+    pDocument = m_pImageObject->GetImage()->GetDocument();
+  }
+  CPDF_Dictionary* pPageResources = pPage ? pPage->m_pPageResources : nullptr;
+  CPDF_Object* pCSObj =
+      m_pImageObject->GetImage()->GetStream()->GetDict()->GetDirectObjectFor(
+          "ColorSpace");
+  CPDF_ColorSpace* pColorSpace =
+      pDocument->LoadColorSpace(pCSObj, pPageResources);
+  if (!pColorSpace)
+    return StartDIBSource();
+  int format = pColorSpace->GetFamily();
+  if (format == PDFCS_DEVICECMYK || format == PDFCS_SEPARATION ||
+      format == PDFCS_DEVICEN) {
+    m_BlendType = FXDIB_BLEND_DARKEN;
+  }
+  pDocument->GetPageData()->ReleaseColorSpace(pCSObj);
+  return StartDIBSource();
+}
+
+bool CPDF_ImageRenderer::Start(CPDF_RenderStatus* pStatus,
+                               CPDF_PageObject* pObj,
+                               const CFX_Matrix* pObj2Device,
+                               bool bStdCS,
+                               int blendType) {
+  m_pRenderStatus = pStatus;
+  m_bStdCS = bStdCS;
+  m_pImageObject = pObj->AsImage();
+  m_BlendType = blendType;
+  m_pObj2Device = pObj2Device;
+  CPDF_Dictionary* pOC = m_pImageObject->GetImage()->GetOC();
+  if (pOC && m_pRenderStatus->m_Options.m_pOCContext &&
+      !m_pRenderStatus->m_Options.m_pOCContext->CheckOCGVisible(pOC)) {
+    return false;
+  }
+  m_ImageMatrix = m_pImageObject->matrix();
+  m_ImageMatrix.Concat(*pObj2Device);
+  if (StartLoadDIBSource())
+    return true;
+  return StartRenderDIBSource();
+}
+
+bool CPDF_ImageRenderer::Start(CPDF_RenderStatus* pStatus,
+                               const CFX_DIBSource* pDIBSource,
+                               FX_ARGB bitmap_argb,
+                               int bitmap_alpha,
+                               const CFX_Matrix* pImage2Device,
+                               uint32_t flags,
+                               bool bStdCS,
+                               int blendType) {
+  m_pRenderStatus = pStatus;
+  m_pDIBSource = pDIBSource;
+  m_FillArgb = bitmap_argb;
+  m_BitmapAlpha = bitmap_alpha;
+  m_ImageMatrix = *pImage2Device;
+  m_Flags = flags;
+  m_bStdCS = bStdCS;
+  m_BlendType = blendType;
+  return StartDIBSource();
+}
+
+bool CPDF_ImageRenderer::DrawPatternImage(const CFX_Matrix* pObj2Device) {
+  if (m_pRenderStatus->m_bPrint &&
+      !(m_pRenderStatus->m_pDevice->GetRenderCaps() & FXRC_BLEND_MODE)) {
+    m_Result = false;
+    return false;
+  }
+  FX_RECT rect = m_ImageMatrix.GetUnitRect().GetOuterRect();
+  rect.Intersect(m_pRenderStatus->m_pDevice->GetClipBox());
+  if (rect.IsEmpty())
+    return false;
+
+  CFX_Matrix new_matrix = m_ImageMatrix;
+  new_matrix.TranslateI(-rect.left, -rect.top);
+  int width = rect.Width();
+  int height = rect.Height();
+  CFX_FxgeDevice bitmap_device1;
+  if (!bitmap_device1.Create(rect.Width(), rect.Height(), FXDIB_Rgb32, nullptr))
+    return true;
+
+  bitmap_device1.GetBitmap()->Clear(0xffffff);
+  CPDF_RenderStatus bitmap_render;
+  bitmap_render.Initialize(m_pRenderStatus->m_pContext, &bitmap_device1,
+                           nullptr, nullptr, nullptr, nullptr,
+                           &m_pRenderStatus->m_Options, 0,
+                           m_pRenderStatus->m_bDropObjects, nullptr, true);
+  CFX_Matrix patternDevice = *pObj2Device;
+  patternDevice.Translate((FX_FLOAT)-rect.left, (FX_FLOAT)-rect.top);
+  if (CPDF_TilingPattern* pTilingPattern = m_pPattern->AsTilingPattern()) {
+    bitmap_render.DrawTilingPattern(pTilingPattern, m_pImageObject,
+                                    &patternDevice, false);
+  } else if (CPDF_ShadingPattern* pShadingPattern =
+                 m_pPattern->AsShadingPattern()) {
+    bitmap_render.DrawShadingPattern(pShadingPattern, m_pImageObject,
+                                     &patternDevice, false);
+  }
+
+  CFX_FxgeDevice bitmap_device2;
+  if (!bitmap_device2.Create(rect.Width(), rect.Height(), FXDIB_8bppRgb,
+                             nullptr)) {
+    return true;
+  }
+  bitmap_device2.GetBitmap()->Clear(0);
+  CPDF_RenderStatus bitmap_render2;
+  bitmap_render2.Initialize(m_pRenderStatus->m_pContext, &bitmap_device2,
+                            nullptr, nullptr, nullptr, nullptr, nullptr, 0,
+                            m_pRenderStatus->m_bDropObjects, nullptr, true);
+  CPDF_ImageRenderer image_render;
+  if (image_render.Start(&bitmap_render2, m_pDIBSource, 0xffffffff, 255,
+                         &new_matrix, m_Flags, true, FXDIB_BLEND_NORMAL)) {
+    image_render.Continue(nullptr);
+  }
+  if (m_Loader.m_MatteColor != 0xffffffff) {
+    int matte_r = FXARGB_R(m_Loader.m_MatteColor);
+    int matte_g = FXARGB_G(m_Loader.m_MatteColor);
+    int matte_b = FXARGB_B(m_Loader.m_MatteColor);
+    for (int row = 0; row < height; row++) {
+      uint8_t* dest_scan =
+          (uint8_t*)bitmap_device1.GetBitmap()->GetScanline(row);
+      const uint8_t* mask_scan = bitmap_device2.GetBitmap()->GetScanline(row);
+      for (int col = 0; col < width; col++) {
+        int alpha = *mask_scan++;
+        if (!alpha) {
+          dest_scan += 4;
+          continue;
+        }
+        int orig = (*dest_scan - matte_b) * 255 / alpha + matte_b;
+        if (orig < 0)
+          orig = 0;
+        else if (orig > 255)
+          orig = 255;
+        *dest_scan++ = orig;
+        orig = (*dest_scan - matte_g) * 255 / alpha + matte_g;
+        if (orig < 0)
+          orig = 0;
+        else if (orig > 255)
+          orig = 255;
+        *dest_scan++ = orig;
+        orig = (*dest_scan - matte_r) * 255 / alpha + matte_r;
+        if (orig < 0)
+          orig = 0;
+        else if (orig > 255)
+          orig = 255;
+        *dest_scan++ = orig;
+        dest_scan++;
+      }
+    }
+  }
+  bitmap_device2.GetBitmap()->ConvertFormat(FXDIB_8bppMask);
+  bitmap_device1.GetBitmap()->MultiplyAlpha(bitmap_device2.GetBitmap());
+  bitmap_device1.GetBitmap()->MultiplyAlpha(255);
+  m_pRenderStatus->m_pDevice->SetDIBitsWithBlend(
+      bitmap_device1.GetBitmap(), rect.left, rect.top, m_BlendType);
+  return false;
+}
+
+bool CPDF_ImageRenderer::DrawMaskedImage() {
+  if (m_pRenderStatus->m_bPrint &&
+      !(m_pRenderStatus->m_pDevice->GetRenderCaps() & FXRC_BLEND_MODE)) {
+    m_Result = false;
+    return false;
+  }
+  FX_RECT rect = m_ImageMatrix.GetUnitRect().GetOuterRect();
+  rect.Intersect(m_pRenderStatus->m_pDevice->GetClipBox());
+  if (rect.IsEmpty())
+    return false;
+
+  CFX_Matrix new_matrix = m_ImageMatrix;
+  new_matrix.TranslateI(-rect.left, -rect.top);
+  int width = rect.Width();
+  int height = rect.Height();
+  CFX_FxgeDevice bitmap_device1;
+  if (!bitmap_device1.Create(width, height, FXDIB_Rgb32, nullptr))
+    return true;
+
+#if defined _SKIA_SUPPORT_
+  bitmap_device1.Clear(0xffffff);
+#else
+  bitmap_device1.GetBitmap()->Clear(0xffffff);
+#endif
+  CPDF_RenderStatus bitmap_render;
+  bitmap_render.Initialize(m_pRenderStatus->m_pContext, &bitmap_device1,
+                           nullptr, nullptr, nullptr, nullptr, nullptr, 0,
+                           m_pRenderStatus->m_bDropObjects, nullptr, true);
+  CPDF_ImageRenderer image_render;
+  if (image_render.Start(&bitmap_render, m_pDIBSource, 0, 255, &new_matrix,
+                         m_Flags, true, FXDIB_BLEND_NORMAL)) {
+    image_render.Continue(nullptr);
+  }
+  CFX_FxgeDevice bitmap_device2;
+  if (!bitmap_device2.Create(width, height, FXDIB_8bppRgb, nullptr))
+    return true;
+
+#if defined _SKIA_SUPPORT_
+  bitmap_device2.Clear(0);
+#else
+  bitmap_device2.GetBitmap()->Clear(0);
+#endif
+  CPDF_RenderStatus bitmap_render2;
+  bitmap_render2.Initialize(m_pRenderStatus->m_pContext, &bitmap_device2,
+                            nullptr, nullptr, nullptr, nullptr, nullptr, 0,
+                            m_pRenderStatus->m_bDropObjects, nullptr, true);
+  CPDF_ImageRenderer image_render2;
+  if (image_render2.Start(&bitmap_render2, m_Loader.m_pMask, 0xffffffff, 255,
+                          &new_matrix, m_Flags, true, FXDIB_BLEND_NORMAL)) {
+    image_render2.Continue(nullptr);
+  }
+  if (m_Loader.m_MatteColor != 0xffffffff) {
+    int matte_r = FXARGB_R(m_Loader.m_MatteColor);
+    int matte_g = FXARGB_G(m_Loader.m_MatteColor);
+    int matte_b = FXARGB_B(m_Loader.m_MatteColor);
+    for (int row = 0; row < height; row++) {
+      uint8_t* dest_scan =
+          (uint8_t*)bitmap_device1.GetBitmap()->GetScanline(row);
+      const uint8_t* mask_scan = bitmap_device2.GetBitmap()->GetScanline(row);
+      for (int col = 0; col < width; col++) {
+        int alpha = *mask_scan++;
+        if (alpha) {
+          int orig = (*dest_scan - matte_b) * 255 / alpha + matte_b;
+          if (orig < 0) {
+            orig = 0;
+          } else if (orig > 255) {
+            orig = 255;
+          }
+          *dest_scan++ = orig;
+          orig = (*dest_scan - matte_g) * 255 / alpha + matte_g;
+          if (orig < 0) {
+            orig = 0;
+          } else if (orig > 255) {
+            orig = 255;
+          }
+          *dest_scan++ = orig;
+          orig = (*dest_scan - matte_r) * 255 / alpha + matte_r;
+          if (orig < 0) {
+            orig = 0;
+          } else if (orig > 255) {
+            orig = 255;
+          }
+          *dest_scan++ = orig;
+          dest_scan++;
+        } else {
+          dest_scan += 4;
+        }
+      }
+    }
+  }
+#ifdef _SKIA_SUPPORT_
+  m_pRenderStatus->m_pDevice->SetBitsWithMask(
+      bitmap_device1.GetBitmap(), bitmap_device2.GetBitmap(), rect.left,
+      rect.top, m_BitmapAlpha, m_BlendType);
+#else
+  bitmap_device2.GetBitmap()->ConvertFormat(FXDIB_8bppMask);
+  bitmap_device1.GetBitmap()->MultiplyAlpha(bitmap_device2.GetBitmap());
+  if (m_BitmapAlpha < 255)
+    bitmap_device1.GetBitmap()->MultiplyAlpha(m_BitmapAlpha);
+  m_pRenderStatus->m_pDevice->SetDIBitsWithBlend(
+      bitmap_device1.GetBitmap(), rect.left, rect.top, m_BlendType);
+#endif  //  _SKIA_SUPPORT_
+  return false;
+}
+
+bool CPDF_ImageRenderer::StartDIBSource() {
+  if (!(m_Flags & RENDER_FORCE_DOWNSAMPLE) && m_pDIBSource->GetBPP() > 1) {
+    FX_SAFE_SIZE_T image_size = m_pDIBSource->GetBPP();
+    image_size /= 8;
+    image_size *= m_pDIBSource->GetWidth();
+    image_size *= m_pDIBSource->GetHeight();
+    if (!image_size.IsValid())
+      return false;
+
+    if (image_size.ValueOrDie() > FPDF_HUGE_IMAGE_SIZE &&
+        !(m_Flags & RENDER_FORCE_HALFTONE)) {
+      m_Flags |= RENDER_FORCE_DOWNSAMPLE;
+    }
+  }
+#ifdef _SKIA_SUPPORT_
+  CFX_DIBitmap* premultiplied = m_pDIBSource->Clone();
+  if (m_pDIBSource->HasAlpha())
+    CFX_SkiaDeviceDriver::PreMultiply(premultiplied);
+  if (m_pRenderStatus->m_pDevice->StartDIBitsWithBlend(
+          premultiplied, m_BitmapAlpha, m_FillArgb, &m_ImageMatrix, m_Flags,
+          m_DeviceHandle, m_BlendType)) {
+    if (m_DeviceHandle) {
+      m_Status = 3;
+      return true;
+    }
+    return false;
+  }
+#else
+  if (m_pRenderStatus->m_pDevice->StartDIBitsWithBlend(
+          m_pDIBSource, m_BitmapAlpha, m_FillArgb, &m_ImageMatrix, m_Flags,
+          m_DeviceHandle, m_BlendType)) {
+    if (m_DeviceHandle) {
+      m_Status = 3;
+      return true;
+    }
+    return false;
+  }
+#endif
+  CFX_FloatRect image_rect_f = m_ImageMatrix.GetUnitRect();
+  FX_RECT image_rect = image_rect_f.GetOuterRect();
+  int dest_width = image_rect.Width();
+  int dest_height = image_rect.Height();
+  if ((FXSYS_fabs(m_ImageMatrix.b) >= 0.5f || m_ImageMatrix.a == 0) ||
+      (FXSYS_fabs(m_ImageMatrix.c) >= 0.5f || m_ImageMatrix.d == 0)) {
+    if (m_pRenderStatus->m_bPrint &&
+        !(m_pRenderStatus->m_pDevice->GetRenderCaps() & FXRC_BLEND_MODE)) {
+      m_Result = false;
+      return false;
+    }
+    FX_RECT clip_box = m_pRenderStatus->m_pDevice->GetClipBox();
+    clip_box.Intersect(image_rect);
+    m_Status = 2;
+    m_pTransformer.reset(new CFX_ImageTransformer(m_pDIBSource, &m_ImageMatrix,
+                                                  m_Flags, &clip_box));
+    m_pTransformer->Start();
+    return true;
+  }
+  if (m_ImageMatrix.a < 0)
+    dest_width = -dest_width;
+
+  if (m_ImageMatrix.d > 0)
+    dest_height = -dest_height;
+
+  int dest_left = dest_width > 0 ? image_rect.left : image_rect.right;
+  int dest_top = dest_height > 0 ? image_rect.top : image_rect.bottom;
+  if (m_pDIBSource->IsOpaqueImage() && m_BitmapAlpha == 255) {
+    if (m_pRenderStatus->m_pDevice->StretchDIBitsWithFlagsAndBlend(
+            m_pDIBSource, dest_left, dest_top, dest_width, dest_height, m_Flags,
+            m_BlendType)) {
+      return false;
+    }
+  }
+  if (m_pDIBSource->IsAlphaMask()) {
+    if (m_BitmapAlpha != 255)
+      m_FillArgb = FXARGB_MUL_ALPHA(m_FillArgb, m_BitmapAlpha);
+    if (m_pRenderStatus->m_pDevice->StretchBitMaskWithFlags(
+            m_pDIBSource, dest_left, dest_top, dest_width, dest_height,
+            m_FillArgb, m_Flags)) {
+      return false;
+    }
+  }
+  if (m_pRenderStatus->m_bPrint &&
+      !(m_pRenderStatus->m_pDevice->GetRenderCaps() & FXRC_BLEND_MODE)) {
+    m_Result = false;
+    return true;
+  }
+
+  FX_RECT clip_box = m_pRenderStatus->m_pDevice->GetClipBox();
+  FX_RECT dest_rect = clip_box;
+  dest_rect.Intersect(image_rect);
+  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);
+  std::unique_ptr<CFX_DIBitmap> pStretched(
+      m_pDIBSource->StretchTo(dest_width, dest_height, m_Flags, &dest_clip));
+  if (pStretched) {
+    m_pRenderStatus->CompositeDIBitmap(pStretched.get(), dest_rect.left,
+                                       dest_rect.top, m_FillArgb, m_BitmapAlpha,
+                                       m_BlendType, false);
+  }
+  return false;
+}
+
+bool CPDF_ImageRenderer::StartBitmapAlpha() {
+  if (m_pDIBSource->IsOpaqueImage()) {
+    CFX_PathData path;
+    path.AppendRect(0, 0, 1, 1);
+    path.Transform(&m_ImageMatrix);
+    uint32_t fill_color =
+        ArgbEncode(0xff, m_BitmapAlpha, m_BitmapAlpha, m_BitmapAlpha);
+    m_pRenderStatus->m_pDevice->DrawPath(&path, nullptr, nullptr, fill_color, 0,
+                                         FXFILL_WINDING);
+    return false;
+  }
+  const CFX_DIBSource* pAlphaMask =
+      m_pDIBSource->IsAlphaMask() ? m_pDIBSource : m_pDIBSource->GetAlphaMask();
+  if (FXSYS_fabs(m_ImageMatrix.b) >= 0.5f ||
+      FXSYS_fabs(m_ImageMatrix.c) >= 0.5f) {
+    int left, top;
+    std::unique_ptr<CFX_DIBitmap> pTransformed(
+        pAlphaMask->TransformTo(&m_ImageMatrix, left, top));
+    if (!pTransformed)
+      return true;
+
+    m_pRenderStatus->m_pDevice->SetBitMask(
+        pTransformed.get(), left, top,
+        ArgbEncode(0xff, m_BitmapAlpha, m_BitmapAlpha, m_BitmapAlpha));
+  } else {
+    CFX_FloatRect image_rect_f = m_ImageMatrix.GetUnitRect();
+    FX_RECT image_rect = image_rect_f.GetOuterRect();
+    int dest_width =
+        m_ImageMatrix.a > 0 ? image_rect.Width() : -image_rect.Width();
+    int dest_height =
+        m_ImageMatrix.d > 0 ? -image_rect.Height() : image_rect.Height();
+    int left = dest_width > 0 ? image_rect.left : image_rect.right;
+    int top = dest_height > 0 ? image_rect.top : image_rect.bottom;
+    m_pRenderStatus->m_pDevice->StretchBitMask(
+        pAlphaMask, left, top, dest_width, dest_height,
+        ArgbEncode(0xff, m_BitmapAlpha, m_BitmapAlpha, m_BitmapAlpha));
+  }
+  if (m_pDIBSource != pAlphaMask)
+    delete pAlphaMask;
+  return false;
+}
+
+bool CPDF_ImageRenderer::Continue(IFX_Pause* pPause) {
+  if (m_Status == 2) {
+    if (m_pTransformer->Continue(pPause))
+      return true;
+
+    std::unique_ptr<CFX_DIBitmap> pBitmap(m_pTransformer->DetachBitmap());
+    if (!pBitmap)
+      return false;
+
+    if (pBitmap->IsAlphaMask()) {
+      if (m_BitmapAlpha != 255)
+        m_FillArgb = FXARGB_MUL_ALPHA(m_FillArgb, m_BitmapAlpha);
+      m_Result = m_pRenderStatus->m_pDevice->SetBitMask(
+          pBitmap.get(), m_pTransformer->result().left,
+          m_pTransformer->result().top, m_FillArgb);
+    } else {
+      if (m_BitmapAlpha != 255)
+        pBitmap->MultiplyAlpha(m_BitmapAlpha);
+      m_Result = m_pRenderStatus->m_pDevice->SetDIBitsWithBlend(
+          pBitmap.get(), m_pTransformer->result().left,
+          m_pTransformer->result().top, m_BlendType);
+    }
+    return false;
+  }
+  if (m_Status == 3)
+    return m_pRenderStatus->m_pDevice->ContinueDIBits(m_DeviceHandle, pPause);
+
+  if (m_Status == 4) {
+    if (m_Loader.Continue(pPause))
+      return true;
+
+    if (StartRenderDIBSource())
+      return Continue(pPause);
+  }
+  return false;
+}