Clean up CFX_ImageStretcher.

core/fxge/dib/fx_dib_main.cpp

 // Copyright 2014 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/fxge/include/fx_dib.h"
 
 #include <limits.h>
 
@@ skipping 1590 matching lines @@
                                  FX_BOOL bRgbByteOrder,
                                  int alpha_flag,
                                  void* pIccTransform,
                                  int blend_type) {
   m_Matrix = *pMatrix;
   CFX_FloatRect image_rect_f = m_Matrix.GetUnitRect();
   FX_RECT image_rect = image_rect_f.GetOutterRect();
   m_ClipBox = pClipRgn ? pClipRgn->GetBox() : FX_RECT(0, 0, pDevice->GetWidth(),
                                                       pDevice->GetHeight());
   m_ClipBox.Intersect(image_rect);
-  if (m_ClipBox.IsEmpty()) {
+  if (m_ClipBox.IsEmpty())
     return FALSE;
-  }
+
   m_pDevice = pDevice;
   m_pClipRgn = pClipRgn;
   m_MaskColor = mask_color;
   m_BitmapAlpha = bitmap_alpha;
   m_Matrix = *pMatrix;
   m_Flags = dib_flags;
   m_AlphaFlag = alpha_flag;
   m_pIccTransform = pIccTransform;
   m_bRgbByteOrder = bRgbByteOrder;
   m_BlendType = blend_type;
-  FX_BOOL ret = TRUE;
+
   if ((FXSYS_fabs(m_Matrix.b) >= 0.5f || m_Matrix.a == 0) ||
       (FXSYS_fabs(m_Matrix.c) >= 0.5f || m_Matrix.d == 0)) {
     if (FXSYS_fabs(m_Matrix.a) < FXSYS_fabs(m_Matrix.b) / 20 &&
         FXSYS_fabs(m_Matrix.d) < FXSYS_fabs(m_Matrix.c) / 20 &&
         FXSYS_fabs(m_Matrix.a) < 0.5f && FXSYS_fabs(m_Matrix.d) < 0.5f) {
       int dest_width = image_rect.Width();
       int dest_height = image_rect.Height();
       FX_RECT bitmap_clip = m_ClipBox;
       bitmap_clip.Offset(-image_rect.left, -image_rect.top);
       bitmap_clip = FXDIB_SwapClipBox(bitmap_clip, dest_width, dest_height,
                                       m_Matrix.c > 0, m_Matrix.b < 0);
       m_Composer.Compose(pDevice, pClipRgn, bitmap_alpha, mask_color, m_ClipBox,
                          TRUE, m_Matrix.c > 0, m_Matrix.b < 0, m_bRgbByteOrder,
                          alpha_flag, pIccTransform, m_BlendType);
-      if (!m_Stretcher.Start(&m_Composer, pSource, dest_height, dest_width,
-                             bitmap_clip, dib_flags)) {
+      m_Stretcher.reset(new CFX_ImageStretcher(&m_Composer, pSource,
+                                               dest_height, dest_width,
+                                               bitmap_clip, dib_flags));
+      if (!m_Stretcher->Start())
         return FALSE;
-      }
+
       m_Status = 1;
       return TRUE;
     }
     m_Status = 2;
     m_pTransformer = new CFX_ImageTransformer;
     m_pTransformer->Start(pSource, &m_Matrix, dib_flags, &m_ClipBox);
     return TRUE;
   }
+
   int dest_width = image_rect.Width();
-  if (m_Matrix.a < 0) {
+  if (m_Matrix.a < 0)
     dest_width = -dest_width;
-  }
+
   int dest_height = image_rect.Height();
-  if (m_Matrix.d > 0) {
+  if (m_Matrix.d > 0)
     dest_height = -dest_height;
-  }
-  if (dest_width == 0 || dest_height == 0) {
+
+  if (dest_width == 0 || dest_height == 0)
     return FALSE;
-  }
+
   FX_RECT bitmap_clip = m_ClipBox;
   bitmap_clip.Offset(-image_rect.left, -image_rect.top);
   m_Composer.Compose(pDevice, pClipRgn, bitmap_alpha, mask_color, m_ClipBox,
                      FALSE, FALSE, FALSE, m_bRgbByteOrder, alpha_flag,
                      pIccTransform, m_BlendType);
   m_Status = 1;
-  ret = m_Stretcher.Start(&m_Composer, pSource, dest_width, dest_height,
-                          bitmap_clip, dib_flags);
-  return ret;
+  m_Stretcher.reset(new CFX_ImageStretcher(
+      &m_Composer, pSource, dest_width, dest_height, bitmap_clip, dib_flags));
+  return m_Stretcher->Start();
 }
+
 FX_BOOL CFX_ImageRenderer::Continue(IFX_Pause* pPause) {
-  if (m_Status == 1) {
-    return m_Stretcher.Continue(pPause);
-  }
+  if (m_Status == 1)
+    return m_Stretcher->Continue(pPause);
+
   if (m_Status == 2) {
     if (m_pTransformer->Continue(pPause)) {
       return TRUE;
     }
     CFX_DIBitmap* pBitmap = m_pTransformer->m_Storer.Detach();
     if (!pBitmap) {
       return FALSE;
     }
     if (!pBitmap->GetBuffer()) {
       delete pBitmap;
@@ skipping 67 matching lines @@
   if (!m_pBitmap->Create(width, height, src_format)) {
     delete m_pBitmap;
     m_pBitmap = NULL;
     return FALSE;
   }
   if (pSrcPalette) {
     m_pBitmap->CopyPalette(pSrcPalette);
   }
   return TRUE;
 }