Split up JBig2_GeneralDecoder.cpp.

core/src/fxcodec/jbig2/JBig2_HtrdProc.cpp

Index: core/src/fxcodec/jbig2/JBig2_HtrdProc.cpp
diff --git a/core/src/fxcodec/jbig2/JBig2_HtrdProc.cpp b/core/src/fxcodec/jbig2/JBig2_HtrdProc.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a5a8b7abfee0ed59d68b1bca23df9200f77b32f3
--- /dev/null
+++ b/core/src/fxcodec/jbig2/JBig2_HtrdProc.cpp
@@ -0,0 +1,103 @@
+// Copyright 2015 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 "JBig2_HtrdProc.h"
+
+#include "../../../../third_party/base/nonstd_unique_ptr.h"
+#include "../../../include/fxcrt/fx_basic.h"
+#include "JBig2_GsidProc.h"
+
+CJBig2_Image* CJBig2_HTRDProc::decode_Arith(CJBig2_ArithDecoder* pArithDecoder,
+                                            JBig2ArithCtx* gbContext,
+                                            IFX_Pause* pPause) {
+  FX_DWORD ng, mg;
+  int32_t x, y;
+  FX_DWORD HBPP;
+  FX_DWORD* GI;
+  nonstd::unique_ptr<CJBig2_Image> HSKIP;
+  nonstd::unique_ptr<CJBig2_Image> HTREG(new CJBig2_Image(HBW, HBH));
+  HTREG->fill(HDEFPIXEL);
+  if (HENABLESKIP == 1) {
+    HSKIP.reset(new CJBig2_Image(HGW, HGH));
+    for (mg = 0; mg < HGH; mg++) {
+      for (ng = 0; ng < HGW; ng++) {
+        x = (HGX + mg * HRY + ng * HRX) >> 8;
+        y = (HGY + mg * HRX - ng * HRY) >> 8;
+        if ((x + HPW <= 0) | (x >= (int32_t)HBW) | (y + HPH <= 0) |
+            (y >= (int32_t)HPH)) {
+          HSKIP->setPixel(ng, mg, 1);
+        } else {
+          HSKIP->setPixel(ng, mg, 0);
+        }
+      }
+    }
+  }
+  HBPP = 1;
+  while ((FX_DWORD)(1 << HBPP) < HNUMPATS) {
+    HBPP++;
+  }
+  nonstd::unique_ptr<CJBig2_GSIDProc> pGID(new CJBig2_GSIDProc());
+  pGID->GSMMR = HMMR;
+  pGID->GSW = HGW;
+  pGID->GSH = HGH;
+  pGID->GSBPP = (uint8_t)HBPP;
+  pGID->GSUSESKIP = HENABLESKIP;
+  pGID->GSKIP = HSKIP.get();
+  pGID->GSTEMPLATE = HTEMPLATE;
+  GI = pGID->decode_Arith(pArithDecoder, gbContext, pPause);
+  if (!GI)
+    return nullptr;
+
+  for (mg = 0; mg < HGH; mg++) {
+    for (ng = 0; ng < HGW; ng++) {
+      x = (HGX + mg * HRY + ng * HRX) >> 8;
+      y = (HGY + mg * HRX - ng * HRY) >> 8;
+      FX_DWORD pat_index = GI[mg * HGW + ng];
+      if (pat_index >= HNUMPATS) {
+        pat_index = HNUMPATS - 1;
+      }
+      HTREG->composeFrom(x, y, HPATS[pat_index], HCOMBOP);
+    }
+  }
+  FX_Free(GI);
+  return HTREG.release();
+}
+
+CJBig2_Image* CJBig2_HTRDProc::decode_MMR(CJBig2_BitStream* pStream,
+                                          IFX_Pause* pPause) {
+  FX_DWORD ng, mg;
+  int32_t x, y;
+  FX_DWORD* GI;
+  nonstd::unique_ptr<CJBig2_Image> HTREG(new CJBig2_Image(HBW, HBH));
+  HTREG->fill(HDEFPIXEL);
+  FX_DWORD HBPP = 1;
+  while ((FX_DWORD)(1 << HBPP) < HNUMPATS) {
+    HBPP++;
+  }
+  nonstd::unique_ptr<CJBig2_GSIDProc> pGID(new CJBig2_GSIDProc());
+  pGID->GSMMR = HMMR;
+  pGID->GSW = HGW;
+  pGID->GSH = HGH;
+  pGID->GSBPP = (uint8_t)HBPP;
+  pGID->GSUSESKIP = 0;
+  GI = pGID->decode_MMR(pStream, pPause);
+  if (!GI)
+    return nullptr;
+
+  for (mg = 0; mg < HGH; mg++) {
+    for (ng = 0; ng < HGW; ng++) {
+      x = (HGX + mg * HRY + ng * HRX) >> 8;
+      y = (HGY + mg * HRX - ng * HRY) >> 8;
+      FX_DWORD pat_index = GI[mg * HGW + ng];
+      if (pat_index >= HNUMPATS) {
+        pat_index = HNUMPATS - 1;
+      }
+      HTREG->composeFrom(x, y, HPATS[pat_index], HCOMBOP);
+    }
+  }
+  FX_Free(GI);
+  return HTREG.release();
+}