Remove dib_int.h

This CL removes dib_int.h by moving CStretchEngine to its own file, other
classes to where they are used, and the remaining to fx_dib.h.

Change-Id: Ie2d4bb39389737cd631f92b88000ea942608da21
Reviewed-on: https://pdfium-review.googlesource.com/3714
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nicolás Peña <npm@chromium.org>

1 files changed, 830 insertions, 0 deletions

diff --git a/core/fxge/dib/cstretchengine.cpp b/core/fxge/dib/cstretchengine.cpp
new file mode 100644
index 0000000000..0025331486
--- /dev/null
+++ b/core/fxge/dib/cstretchengine.cpp
@@ -0,0 +1,830 @@
+// Copyright 2017 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/dib/cstretchengine.h"
+
+#include "core/fxge/dib/cfx_dibitmap.h"
+#include "core/fxge/dib/cfx_dibsource.h"
+#include "core/fxge/dib/ifx_scanlinecomposer.h"
+#include "core/fxge/fx_dib.h"
+
+CStretchEngine::CWeightTable::CWeightTable()
+    : m_DestMin(0),
+      m_ItemSize(0),
+      m_pWeightTables(nullptr),
+      m_dwWeightTablesSize(0) {}
+
+CStretchEngine::CWeightTable::~CWeightTable() {
+  FX_Free(m_pWeightTables);
+}
+
+size_t CStretchEngine::CWeightTable::GetPixelWeightSize() const {
+  return m_ItemSize / sizeof(int) - 2;
+}
+
+bool CStretchEngine::CWeightTable::Calc(int dest_len,
+                                        int dest_min,
+                                        int dest_max,
+                                        int src_len,
+                                        int src_min,
+                                        int src_max,
+                                        int flags) {
+  FX_Free(m_pWeightTables);
+  m_pWeightTables = nullptr;
+  m_dwWeightTablesSize = 0;
+  const double scale = (float)src_len / (float)dest_len;
+  const double base = dest_len < 0 ? (float)(src_len) : 0;
+  const int ext_size = flags & FXDIB_BICUBIC_INTERPOL ? 3 : 1;
+  m_ItemSize = sizeof(int) * 2 +
+               (int)(sizeof(int) * (ceil(fabs((float)scale)) + ext_size));
+  m_DestMin = dest_min;
+  if ((dest_max - dest_min) > (int)((1U << 30) - 4) / m_ItemSize)
+    return false;
+
+  m_dwWeightTablesSize = (dest_max - dest_min) * m_ItemSize + 4;
+  m_pWeightTables = FX_TryAlloc(uint8_t, m_dwWeightTablesSize);
+  if (!m_pWeightTables)
+    return false;
+
+  if ((flags & FXDIB_NOSMOOTH) != 0 || fabs((float)scale) < 1.0f) {
+    for (int dest_pixel = dest_min; dest_pixel < dest_max; dest_pixel++) {
+      PixelWeight& pixel_weights = *GetPixelWeight(dest_pixel);
+      double src_pos = dest_pixel * scale + scale / 2 + base;
+      if (flags & FXDIB_INTERPOL) {
+        pixel_weights.m_SrcStart = (int)floor((float)src_pos - 1.0f / 2);
+        pixel_weights.m_SrcEnd = (int)floor((float)src_pos + 1.0f / 2);
+        if (pixel_weights.m_SrcStart < src_min) {
+          pixel_weights.m_SrcStart = src_min;
+        }
+        if (pixel_weights.m_SrcEnd >= src_max) {
+          pixel_weights.m_SrcEnd = src_max - 1;
+        }
+        if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) {
+          pixel_weights.m_Weights[0] = 65536;
+        } else {
+          pixel_weights.m_Weights[1] = FXSYS_round(
+              (float)(src_pos - pixel_weights.m_SrcStart - 1.0f / 2) * 65536);
+          pixel_weights.m_Weights[0] = 65536 - pixel_weights.m_Weights[1];
+        }
+      } else if (flags & FXDIB_BICUBIC_INTERPOL) {
+        pixel_weights.m_SrcStart = (int)floor((float)src_pos - 1.0f / 2);
+        pixel_weights.m_SrcEnd = (int)floor((float)src_pos + 1.0f / 2);
+        int start = pixel_weights.m_SrcStart - 1;
+        int end = pixel_weights.m_SrcEnd + 1;
+        if (start < src_min) {
+          start = src_min;
+        }
+        if (end >= src_max) {
+          end = src_max - 1;
+        }
+        if (pixel_weights.m_SrcStart < src_min) {
+          src_pos += src_min - pixel_weights.m_SrcStart;
+          pixel_weights.m_SrcStart = src_min;
+        }
+        if (pixel_weights.m_SrcEnd >= src_max) {
+          pixel_weights.m_SrcEnd = src_max - 1;
+        }
+        int weight;
+        weight = FXSYS_round(
+            (float)(src_pos - pixel_weights.m_SrcStart - 1.0f / 2) * 256);
+        if (start == end) {
+          pixel_weights.m_Weights[0] =
+              (SDP_Table[256 + weight] + SDP_Table[weight] +
+               SDP_Table[256 - weight] + SDP_Table[512 - weight])
+              << 8;
+        } else if ((start == pixel_weights.m_SrcStart &&
+                    (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd ||
+                     end == pixel_weights.m_SrcEnd) &&
+                    start < end) ||
+                   (start < pixel_weights.m_SrcStart &&
+                    pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd &&
+                    end == pixel_weights.m_SrcEnd)) {
+          if (start < pixel_weights.m_SrcStart) {
+            pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8;
+            pixel_weights.m_Weights[1] =
+                (SDP_Table[weight] + SDP_Table[256 - weight] +
+                 SDP_Table[512 - weight])
+                << 8;
+          } else {
+            if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) {
+              pixel_weights.m_Weights[0] =
+                  (SDP_Table[256 + weight] + SDP_Table[weight] +
+                   SDP_Table[256 - weight])
+                  << 8;
+              pixel_weights.m_Weights[1] = SDP_Table[512 - weight] << 8;
+            } else {
+              pixel_weights.m_Weights[0] =
+                  (SDP_Table[256 + weight] + SDP_Table[weight]) << 8;
+              pixel_weights.m_Weights[1] =
+                  (SDP_Table[256 - weight] + SDP_Table[512 - weight]) << 8;
+            }
+          }
+          if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) {
+            pixel_weights.m_SrcEnd = end;
+          }
+          if (start < pixel_weights.m_SrcStart) {
+            pixel_weights.m_SrcStart = start;
+          }
+        } else if (start == pixel_weights.m_SrcStart &&
+                   start < pixel_weights.m_SrcEnd &&
+                   pixel_weights.m_SrcEnd < end) {
+          pixel_weights.m_Weights[0] =
+              (SDP_Table[256 + weight] + SDP_Table[weight]) << 8;
+          pixel_weights.m_Weights[1] = SDP_Table[256 - weight] << 8;
+          pixel_weights.m_Weights[2] = SDP_Table[512 - weight] << 8;
+          pixel_weights.m_SrcEnd = end;
+        } else if (start < pixel_weights.m_SrcStart &&
+                   pixel_weights.m_SrcStart < pixel_weights.m_SrcEnd &&
+                   pixel_weights.m_SrcEnd == end) {
+          pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8;
+          pixel_weights.m_Weights[1] = SDP_Table[weight] << 8;
+          pixel_weights.m_Weights[2] =
+              (SDP_Table[256 - weight] + SDP_Table[512 - weight]) << 8;
+          pixel_weights.m_SrcStart = start;
+        } else {
+          pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8;
+          pixel_weights.m_Weights[1] = SDP_Table[weight] << 8;
+          pixel_weights.m_Weights[2] = SDP_Table[256 - weight] << 8;
+          pixel_weights.m_Weights[3] = SDP_Table[512 - weight] << 8;
+          pixel_weights.m_SrcStart = start;
+          pixel_weights.m_SrcEnd = end;
+        }
+      } else {
+        pixel_weights.m_SrcStart = pixel_weights.m_SrcEnd =
+            (int)floor((float)src_pos);
+        if (pixel_weights.m_SrcStart < src_min) {
+          pixel_weights.m_SrcStart = src_min;
+        }
+        if (pixel_weights.m_SrcEnd >= src_max) {
+          pixel_weights.m_SrcEnd = src_max - 1;
+        }
+        pixel_weights.m_Weights[0] = 65536;
+      }
+    }
+    return true;
+  }
+
+  for (int dest_pixel = dest_min; dest_pixel < dest_max; dest_pixel++) {
+    PixelWeight& pixel_weights = *GetPixelWeight(dest_pixel);
+    double src_start = dest_pixel * scale + base;
+    double src_end = src_start + scale;
+    int start_i, end_i;
+    if (src_start < src_end) {
+      start_i = (int)floor((float)src_start);
+      end_i = (int)ceil((float)src_end);
+    } else {
+      start_i = (int)floor((float)src_end);
+      end_i = (int)ceil((float)src_start);
+    }
+    if (start_i < src_min) {
+      start_i = src_min;
+    }
+    if (end_i >= src_max) {
+      end_i = src_max - 1;
+    }
+    if (start_i > end_i) {
+      if (start_i >= src_max) {
+        start_i = src_max - 1;
+      }
+      pixel_weights.m_SrcStart = start_i;
+      pixel_weights.m_SrcEnd = start_i;
+      continue;
+    }
+    pixel_weights.m_SrcStart = start_i;
+    pixel_weights.m_SrcEnd = end_i;
+    for (int j = start_i; j <= end_i; j++) {
+      double dest_start = ((float)j - base) / scale;
+      double dest_end = ((float)(j + 1) - base) / scale;
+      if (dest_start > dest_end) {
+        double temp = dest_start;
+        dest_start = dest_end;
+        dest_end = temp;
+      }
+      double area_start =
+          dest_start > (float)(dest_pixel) ? dest_start : (float)(dest_pixel);
+      double area_end = dest_end > (float)(dest_pixel + 1)
+                            ? (float)(dest_pixel + 1)
+                            : dest_end;
+      double weight = area_start >= area_end ? 0.0f : area_end - area_start;
+      if (weight == 0 && j == end_i) {
+        pixel_weights.m_SrcEnd--;
+        break;
+      }
+      size_t idx = j - start_i;
+      if (idx >= GetPixelWeightSize())
+        return false;
+      pixel_weights.m_Weights[idx] = FXSYS_round((float)(weight * 65536));
+    }
+  }
+  return true;
+}
+
+PixelWeight* CStretchEngine::CWeightTable::GetPixelWeight(int pixel) const {
+  ASSERT(pixel >= m_DestMin);
+  return reinterpret_cast<PixelWeight*>(m_pWeightTables +
+                                        (pixel - m_DestMin) * m_ItemSize);
+}
+
+int* CStretchEngine::CWeightTable::GetValueFromPixelWeight(PixelWeight* pWeight,
+                                                           int index) const {
+  if (index < pWeight->m_SrcStart)
+    return nullptr;
+
+  size_t idx = index - pWeight->m_SrcStart;
+  return idx < GetPixelWeightSize() ? &pWeight->m_Weights[idx] : nullptr;
+}
+
+CStretchEngine::CStretchEngine(IFX_ScanlineComposer* pDestBitmap,
+                               FXDIB_Format dest_format,
+                               int dest_width,
+                               int dest_height,
+                               const FX_RECT& clip_rect,
+                               const CFX_RetainPtr<CFX_DIBSource>& pSrcBitmap,
+                               int flags) {
+  m_State = 0;
+  m_DestFormat = dest_format;
+  m_DestBpp = dest_format & 0xff;
+  m_SrcBpp = pSrcBitmap->GetFormat() & 0xff;
+  m_bHasAlpha = pSrcBitmap->GetFormat() & 0x200;
+  m_pSrcPalette = pSrcBitmap->GetPalette();
+  m_pDestBitmap = pDestBitmap;
+  m_DestWidth = dest_width;
+  m_DestHeight = dest_height;
+  m_pInterBuf = nullptr;
+  m_pExtraAlphaBuf = nullptr;
+  m_pDestMaskScanline = nullptr;
+  m_DestClip = clip_rect;
+  uint32_t size = clip_rect.Width();
+  if (size && m_DestBpp > (int)(INT_MAX / size)) {
+    return;
+  }
+  size *= m_DestBpp;
+  if (size > INT_MAX - 31) {
+    return;
+  }
+  size += 31;
+  size = size / 32 * 4;
+  m_pDestScanline = FX_TryAlloc(uint8_t, size);
+  if (!m_pDestScanline) {
+    return;
+  }
+  if (dest_format == FXDIB_Rgb32) {
+    memset(m_pDestScanline, 255, size);
+  }
+  m_InterPitch = (m_DestClip.Width() * m_DestBpp + 31) / 32 * 4;
+  m_ExtraMaskPitch = (m_DestClip.Width() * 8 + 31) / 32 * 4;
+  m_pInterBuf = nullptr;
+  m_pSource = pSrcBitmap;
+  m_SrcWidth = pSrcBitmap->GetWidth();
+  m_SrcHeight = pSrcBitmap->GetHeight();
+  m_SrcPitch = (m_SrcWidth * m_SrcBpp + 31) / 32 * 4;
+  if ((flags & FXDIB_NOSMOOTH) == 0) {
+    bool bInterpol = flags & FXDIB_INTERPOL || flags & FXDIB_BICUBIC_INTERPOL;
+    if (!bInterpol && abs(dest_width) != 0 &&
+        abs(dest_height) / 8 < static_cast<long long>(m_SrcWidth) *
+                                   m_SrcHeight / abs(dest_width)) {
+      flags = FXDIB_INTERPOL;
+    }
+    m_Flags = flags;
+  } else {
+    m_Flags = FXDIB_NOSMOOTH;
+    if (flags & FXDIB_DOWNSAMPLE) {
+      m_Flags |= FXDIB_DOWNSAMPLE;
+    }
+  }
+  double scale_x = (float)m_SrcWidth / (float)m_DestWidth;
+  double scale_y = (float)m_SrcHeight / (float)m_DestHeight;
+  double base_x = m_DestWidth > 0 ? 0.0f : (float)(m_DestWidth);
+  double base_y = m_DestHeight > 0 ? 0.0f : (float)(m_DestHeight);
+  double src_left = scale_x * ((float)(clip_rect.left) + base_x);
+  double src_right = scale_x * ((float)(clip_rect.right) + base_x);
+  double src_top = scale_y * ((float)(clip_rect.top) + base_y);
+  double src_bottom = scale_y * ((float)(clip_rect.bottom) + base_y);
+  if (src_left > src_right) {
+    double temp = src_left;
+    src_left = src_right;
+    src_right = temp;
+  }
+  if (src_top > src_bottom) {
+    double temp = src_top;
+    src_top = src_bottom;
+    src_bottom = temp;
+  }
+  m_SrcClip.left = (int)floor((float)src_left);
+  m_SrcClip.right = (int)ceil((float)src_right);
+  m_SrcClip.top = (int)floor((float)src_top);
+  m_SrcClip.bottom = (int)ceil((float)src_bottom);
+  FX_RECT src_rect(0, 0, m_SrcWidth, m_SrcHeight);
+  m_SrcClip.Intersect(src_rect);
+  if (m_SrcBpp == 1) {
+    if (m_DestBpp == 8) {
+      m_TransMethod = 1;
+    } else {
+      m_TransMethod = 2;
+    }
+  } else if (m_SrcBpp == 8) {
+    if (m_DestBpp == 8) {
+      if (!m_bHasAlpha) {
+        m_TransMethod = 3;
+      } else {
+        m_TransMethod = 4;
+      }
+    } else {
+      if (!m_bHasAlpha) {
+        m_TransMethod = 5;
+      } else {
+        m_TransMethod = 6;
+      }
+    }
+  } else {
+    if (!m_bHasAlpha) {
+      m_TransMethod = 7;
+    } else {
+      m_TransMethod = 8;
+    }
+  }
+}
+
+CStretchEngine::~CStretchEngine() {
+  FX_Free(m_pDestScanline);
+  FX_Free(m_pInterBuf);
+  FX_Free(m_pExtraAlphaBuf);
+  FX_Free(m_pDestMaskScanline);
+}
+
+bool CStretchEngine::Continue(IFX_Pause* pPause) {
+  while (m_State == 1) {
+    if (ContinueStretchHorz(pPause)) {
+      return true;
+    }
+    m_State = 2;
+    StretchVert();
+  }
+  return false;
+}
+
+bool CStretchEngine::StartStretchHorz() {
+  if (m_DestWidth == 0 || m_InterPitch == 0 || !m_pDestScanline)
+    return false;
+
+  if (m_SrcClip.Height() == 0 ||
+      m_SrcClip.Height() > (1 << 29) / m_InterPitch) {
+    return false;
+  }
+
+  m_pInterBuf = FX_TryAlloc(unsigned char, m_SrcClip.Height() * m_InterPitch);
+  if (!m_pInterBuf)
+    return false;
+
+  if (m_pSource && m_bHasAlpha && m_pSource->m_pAlphaMask) {
+    m_pExtraAlphaBuf =
+        FX_Alloc2D(unsigned char, m_SrcClip.Height(), m_ExtraMaskPitch);
+    uint32_t size = (m_DestClip.Width() * 8 + 31) / 32 * 4;
+    m_pDestMaskScanline = FX_TryAlloc(unsigned char, size);
+    if (!m_pDestMaskScanline)
+      return false;
+  }
+  bool ret =
+      m_WeightTable.Calc(m_DestWidth, m_DestClip.left, m_DestClip.right,
+                         m_SrcWidth, m_SrcClip.left, m_SrcClip.right, m_Flags);
+  if (!ret)
+    return false;
+
+  m_CurRow = m_SrcClip.top;
+  m_State = 1;
+  return true;
+}
+
+bool CStretchEngine::ContinueStretchHorz(IFX_Pause* pPause) {
+  if (!m_DestWidth)
+    return false;
+
+  if (m_pSource->SkipToScanline(m_CurRow, pPause))
+    return true;
+
+  int Bpp = m_DestBpp / 8;
+  static const int kStrechPauseRows = 10;
+  int rows_to_go = kStrechPauseRows;
+  for (; m_CurRow < m_SrcClip.bottom; m_CurRow++) {
+    if (rows_to_go == 0) {
+      if (pPause && pPause->NeedToPauseNow())
+        return true;
+
+      rows_to_go = kStrechPauseRows;
+    }
+
+    const uint8_t* src_scan = m_pSource->GetScanline(m_CurRow);
+    uint8_t* dest_scan =
+        m_pInterBuf + (m_CurRow - m_SrcClip.top) * m_InterPitch;
+    const uint8_t* src_scan_mask = nullptr;
+    uint8_t* dest_scan_mask = nullptr;
+    if (m_pExtraAlphaBuf) {
+      src_scan_mask = m_pSource->m_pAlphaMask->GetScanline(m_CurRow);
+      dest_scan_mask =
+          m_pExtraAlphaBuf + (m_CurRow - m_SrcClip.top) * m_ExtraMaskPitch;
+    }
+    switch (m_TransMethod) {
+      case 1:
+      case 2: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_a = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            if (src_scan[j / 8] & (1 << (7 - j % 8))) {
+              dest_a += pixel_weight * 255;
+            }
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a;
+          }
+          *dest_scan++ = (uint8_t)(dest_a >> 16);
+        }
+        break;
+      }
+      case 3: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_a = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            dest_a += pixel_weight * src_scan[j];
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a;
+          }
+          *dest_scan++ = (uint8_t)(dest_a >> 16);
+        }
+        break;
+      }
+      case 4: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_a = 0, dest_r = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            pixel_weight = pixel_weight * src_scan_mask[j] / 255;
+            dest_r += pixel_weight * src_scan[j];
+            dest_a += pixel_weight;
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_r = dest_r < 0 ? 0 : dest_r > 16711680 ? 16711680 : dest_r;
+            dest_a = dest_a < 0 ? 0 : dest_a > 65536 ? 65536 : dest_a;
+          }
+          *dest_scan++ = (uint8_t)(dest_r >> 16);
+          *dest_scan_mask++ = (uint8_t)((dest_a * 255) >> 16);
+        }
+        break;
+      }
+      case 5: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_r_y = 0, dest_g_m = 0, dest_b_c = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            unsigned long argb_cmyk = m_pSrcPalette[src_scan[j]];
+            if (m_DestFormat == FXDIB_Rgb) {
+              dest_r_y += pixel_weight * (uint8_t)(argb_cmyk >> 16);
+              dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 8);
+              dest_b_c += pixel_weight * (uint8_t)argb_cmyk;
+            } else {
+              dest_b_c += pixel_weight * (uint8_t)(argb_cmyk >> 24);
+              dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 16);
+              dest_r_y += pixel_weight * (uint8_t)(argb_cmyk >> 8);
+            }
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_r_y =
+                dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y;
+            dest_g_m =
+                dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m;
+            dest_b_c =
+                dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c;
+          }
+          *dest_scan++ = (uint8_t)(dest_b_c >> 16);
+          *dest_scan++ = (uint8_t)(dest_g_m >> 16);
+          *dest_scan++ = (uint8_t)(dest_r_y >> 16);
+        }
+        break;
+      }
+      case 6: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_a = 0, dest_r_y = 0, dest_g_m = 0, dest_b_c = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            pixel_weight = pixel_weight * src_scan_mask[j] / 255;
+            unsigned long argb_cmyk = m_pSrcPalette[src_scan[j]];
+            if (m_DestFormat == FXDIB_Rgba) {
+              dest_r_y += pixel_weight * (uint8_t)(argb_cmyk >> 16);
+              dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 8);
+              dest_b_c += pixel_weight * (uint8_t)argb_cmyk;
+            } else {
+              dest_b_c += pixel_weight * (uint8_t)(argb_cmyk >> 24);
+              dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 16);
+              dest_r_y += pixel_weight * (uint8_t)(argb_cmyk >> 8);
+            }
+            dest_a += pixel_weight;
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_b_c =
+                dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c;
+            dest_g_m =
+                dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m;
+            dest_r_y =
+                dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y;
+            dest_a = dest_a < 0 ? 0 : dest_a > 65536 ? 65536 : dest_a;
+          }
+          *dest_scan++ = (uint8_t)(dest_b_c >> 16);
+          *dest_scan++ = (uint8_t)(dest_g_m >> 16);
+          *dest_scan++ = (uint8_t)(dest_r_y >> 16);
+          *dest_scan_mask++ = (uint8_t)((dest_a * 255) >> 16);
+        }
+        break;
+      }
+      case 7: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_r_y = 0, dest_g_m = 0, dest_b_c = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            const uint8_t* src_pixel = src_scan + j * Bpp;
+            dest_b_c += pixel_weight * (*src_pixel++);
+            dest_g_m += pixel_weight * (*src_pixel++);
+            dest_r_y += pixel_weight * (*src_pixel);
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_b_c =
+                dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c;
+            dest_g_m =
+                dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m;
+            dest_r_y =
+                dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y;
+          }
+          *dest_scan++ = (uint8_t)((dest_b_c) >> 16);
+          *dest_scan++ = (uint8_t)((dest_g_m) >> 16);
+          *dest_scan++ = (uint8_t)((dest_r_y) >> 16);
+          dest_scan += Bpp - 3;
+        }
+        break;
+      }
+      case 8: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col);
+          int dest_a = 0, dest_r_y = 0, dest_g_m = 0, dest_b_c = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight =
+                m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return false;
+
+            int pixel_weight = *pWeight;
+            const uint8_t* src_pixel = src_scan + j * Bpp;
+            if (m_DestFormat == FXDIB_Argb) {
+              pixel_weight = pixel_weight * src_pixel[3] / 255;
+            } else {
+              pixel_weight = pixel_weight * src_scan_mask[j] / 255;
+            }
+            dest_b_c += pixel_weight * (*src_pixel++);
+            dest_g_m += pixel_weight * (*src_pixel++);
+            dest_r_y += pixel_weight * (*src_pixel);
+            dest_a += pixel_weight;
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_r_y =
+                dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y;
+            dest_g_m =
+                dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m;
+            dest_b_c =
+                dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c;
+            dest_a = dest_a < 0 ? 0 : dest_a > 65536 ? 65536 : dest_a;
+          }
+          *dest_scan++ = (uint8_t)((dest_b_c) >> 16);
+          *dest_scan++ = (uint8_t)((dest_g_m) >> 16);
+          *dest_scan++ = (uint8_t)((dest_r_y) >> 16);
+          if (m_DestFormat == FXDIB_Argb) {
+            *dest_scan = (uint8_t)((dest_a * 255) >> 16);
+          }
+          if (dest_scan_mask) {
+            *dest_scan_mask++ = (uint8_t)((dest_a * 255) >> 16);
+          }
+          dest_scan += Bpp - 3;
+        }
+        break;
+      }
+    }
+    rows_to_go--;
+  }
+  return false;
+}
+
+void CStretchEngine::StretchVert() {
+  if (m_DestHeight == 0)
+    return;
+
+  CWeightTable table;
+  bool ret = table.Calc(m_DestHeight, m_DestClip.top, m_DestClip.bottom,
+                        m_SrcHeight, m_SrcClip.top, m_SrcClip.bottom, m_Flags);
+  if (!ret)
+    return;
+
+  const int DestBpp = m_DestBpp / 8;
+  for (int row = m_DestClip.top; row < m_DestClip.bottom; row++) {
+    unsigned char* dest_scan = m_pDestScanline;
+    unsigned char* dest_scan_mask = m_pDestMaskScanline;
+    PixelWeight* pPixelWeights = table.GetPixelWeight(row);
+    switch (m_TransMethod) {
+      case 1:
+      case 2:
+      case 3: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          unsigned char* src_scan =
+              m_pInterBuf + (col - m_DestClip.left) * DestBpp;
+          int dest_a = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return;
+
+            int pixel_weight = *pWeight;
+            dest_a +=
+                pixel_weight * src_scan[(j - m_SrcClip.top) * m_InterPitch];
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a;
+          }
+          *dest_scan = (uint8_t)(dest_a >> 16);
+          dest_scan += DestBpp;
+        }
+        break;
+      }
+      case 4: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          unsigned char* src_scan =
+              m_pInterBuf + (col - m_DestClip.left) * DestBpp;
+          unsigned char* src_scan_mask =
+              m_pExtraAlphaBuf + (col - m_DestClip.left);
+          int dest_a = 0, dest_k = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return;
+
+            int pixel_weight = *pWeight;
+            dest_k +=
+                pixel_weight * src_scan[(j - m_SrcClip.top) * m_InterPitch];
+            dest_a += pixel_weight *
+                      src_scan_mask[(j - m_SrcClip.top) * m_ExtraMaskPitch];
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_k = dest_k < 0 ? 0 : dest_k > 16711680 ? 16711680 : dest_k;
+            dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a;
+          }
+          *dest_scan = (uint8_t)(dest_k >> 16);
+          dest_scan += DestBpp;
+          *dest_scan_mask++ = (uint8_t)(dest_a >> 16);
+        }
+        break;
+      }
+      case 5:
+      case 7: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          unsigned char* src_scan =
+              m_pInterBuf + (col - m_DestClip.left) * DestBpp;
+          int dest_r_y = 0, dest_g_m = 0, dest_b_c = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return;
+
+            int pixel_weight = *pWeight;
+            const uint8_t* src_pixel =
+                src_scan + (j - m_SrcClip.top) * m_InterPitch;
+            dest_b_c += pixel_weight * (*src_pixel++);
+            dest_g_m += pixel_weight * (*src_pixel++);
+            dest_r_y += pixel_weight * (*src_pixel);
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_r_y =
+                dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y;
+            dest_g_m =
+                dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m;
+            dest_b_c =
+                dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c;
+          }
+          dest_scan[0] = (uint8_t)((dest_b_c) >> 16);
+          dest_scan[1] = (uint8_t)((dest_g_m) >> 16);
+          dest_scan[2] = (uint8_t)((dest_r_y) >> 16);
+          dest_scan += DestBpp;
+        }
+        break;
+      }
+      case 6:
+      case 8: {
+        for (int col = m_DestClip.left; col < m_DestClip.right; col++) {
+          unsigned char* src_scan =
+              m_pInterBuf + (col - m_DestClip.left) * DestBpp;
+          unsigned char* src_scan_mask = nullptr;
+          if (m_DestFormat != FXDIB_Argb) {
+            src_scan_mask = m_pExtraAlphaBuf + (col - m_DestClip.left);
+          }
+          int dest_a = 0, dest_r_y = 0, dest_g_m = 0, dest_b_c = 0;
+          for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd;
+               j++) {
+            int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, j);
+            if (!pWeight)
+              return;
+
+            int pixel_weight = *pWeight;
+            const uint8_t* src_pixel =
+                src_scan + (j - m_SrcClip.top) * m_InterPitch;
+            int mask_v = 255;
+            if (src_scan_mask) {
+              mask_v = src_scan_mask[(j - m_SrcClip.top) * m_ExtraMaskPitch];
+            }
+            dest_b_c += pixel_weight * (*src_pixel++);
+            dest_g_m += pixel_weight * (*src_pixel++);
+            dest_r_y += pixel_weight * (*src_pixel);
+            if (m_DestFormat == FXDIB_Argb) {
+              dest_a += pixel_weight * (*(src_pixel + 1));
+            } else {
+              dest_a += pixel_weight * mask_v;
+            }
+          }
+          if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
+            dest_r_y =
+                dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y;
+            dest_g_m =
+                dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m;
+            dest_b_c =
+                dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c;
+            dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a;
+          }
+          if (dest_a) {
+            int r = ((uint32_t)dest_r_y) * 255 / dest_a;
+            int g = ((uint32_t)dest_g_m) * 255 / dest_a;
+            int b = ((uint32_t)dest_b_c) * 255 / dest_a;
+            dest_scan[0] = b > 255 ? 255 : b < 0 ? 0 : b;
+            dest_scan[1] = g > 255 ? 255 : g < 0 ? 0 : g;
+            dest_scan[2] = r > 255 ? 255 : r < 0 ? 0 : r;
+          }
+          if (m_DestFormat == FXDIB_Argb) {
+            dest_scan[3] = (uint8_t)((dest_a) >> 16);
+          } else {
+            *dest_scan_mask = (uint8_t)((dest_a) >> 16);
+          }
+          dest_scan += DestBpp;
+          if (dest_scan_mask) {
+            dest_scan_mask++;
+          }
+        }
+        break;
+      }
+    }
+    m_pDestBitmap->ComposeScanline(row - m_DestClip.top, m_pDestScanline,
+                                   m_pDestMaskScanline);
+  }
+}