Simplify PDFium by removing code that's not used in the open source repo.

core/src/fxge/dib/fx_dib_engine.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 "../../../include/fxge/fx_dib.h"
 #include "../../../include/fxge/fx_ge.h"
 #include "dib_int.h"
 #include <limits.h>
@@ skipping 293 matching lines @@
     }
     if (m_pDestMaskScanline) {
         FX_Free(m_pDestMaskScanline);
     }
 }
 FX_BOOL CStretchEngine::StartStretchHorz()
 {
     if (m_DestWidth == 0 || m_pDestScanline == NULL || m_SrcClip.Height() > (int)((1U << 29) / m_InterPitch) || m_SrcClip.Height() == 0) {
         return FALSE;
     }
-#ifndef _FPDFAPI_MINI_
     m_pInterBuf = FX_AllocNL(unsigned char, m_SrcClip.Height() * m_InterPitch);
-#else
-    m_pInterBuf = FX_Alloc(unsigned char, m_SrcClip.Height() * m_InterPitch);
-#endif
     if (m_pInterBuf == NULL) {
         return FALSE;
     }
     if (m_pSource && m_bHasAlpha && m_pSource->m_pAlphaMask) {
         m_pExtraAlphaBuf = FX_Alloc(unsigned char, m_SrcClip.Height() * m_ExtraMaskPitch);
         if (!m_pExtraAlphaBuf) {
             return FALSE;
         }
         FX_DWORD size = (m_DestClip.Width() * 8 + 31) / 32 * 4;
         m_pDestMaskScanline = FX_AllocNL(unsigned char, size);
@@ skipping 430 matching lines @@
     }
 }
 FX_BOOL CFX_ImageStretcher::Continue(IFX_Pause* pPause)
 {
     if (m_Flags & FXDIB_DOWNSAMPLE) {
         return ContinueQuickStretch(pPause);
     } else {
         return ContinueStretch(pPause);
     }
 }
-#ifndef _FPDFAPI_MINI_
 #define MAX_PROGRESSIVE_STRETCH_PIXELS  1000000
-#else
-#define MAX_PROGRESSIVE_STRETCH_PIXELS  100000
-#endif
 FX_BOOL CFX_ImageStretcher::StartStretch()
 {
     m_pStretchEngine = FX_NEW CStretchEngine(m_pDest, m_DestFormat, m_DestWidth, m_DestHeight, m_ClipRect, m_pSource, m_Flags);
     if (!m_pStretchEngine) {
         return FALSE;
     }
     m_pStretchEngine->StartStretchHorz();
     if (m_pSource->GetWidth() * m_pSource->GetHeight() < MAX_PROGRESSIVE_STRETCH_PIXELS) {
         m_pStretchEngine->Continue(NULL);
         return FALSE;
     }
     return TRUE;
 }
 FX_BOOL CFX_ImageStretcher::ContinueStretch(IFX_Pause* pPause)
 {
     if (m_pStretchEngine == NULL) {
         return FALSE;
     }
     return m_pStretchEngine->Continue(pPause);
 }
 FX_BOOL CFX_ImageStretcher::StartQuickStretch()
 {
-#ifdef _FPDFAPI_MINI_
-    m_pSource->SetDownSampleSize(m_DestWidth, m_DestHeight);
-#endif
     m_bFlipX = FALSE;
     m_bFlipY = FALSE;
     if (m_DestWidth < 0) {
         m_bFlipX = TRUE;
         m_DestWidth = -m_DestWidth;
     }
     if (m_DestHeight < 0) {
         m_bFlipY = TRUE;
         m_DestHeight = -m_DestHeight;
     }
@@ skipping 45 matching lines @@
             return TRUE;
         }
         m_pSource->DownSampleScanline(src_y, m_pScanline, m_DestBPP, m_DestWidth, m_bFlipX, m_ClipRect.left, result_width);
         if (m_pMaskScanline) {
             m_pSource->m_pAlphaMask->DownSampleScanline(src_y, m_pMaskScanline, 1, m_DestWidth, m_bFlipX, m_ClipRect.left, result_width);
         }
         m_pDest->ComposeScanline(dest_y, m_pScanline, m_pMaskScanline);
     }
     return FALSE;
 }