Revert of Delete SkImageDecoder

src/images/bmpdecoderhelper.h

+
+/*
+ * Copyright 2007 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef IMAGE_CODEC_BMPDECODERHELPER_H__
+#define IMAGE_CODEC_BMPDECODERHELPER_H__
+
+///////////////////////////////////////////////////////////////////////////////
+// this section is my current "glue" between google3 code and android.
+// will be fixed soon
+
+#include "SkTypes.h"
+#include <limits.h>
+#define DISALLOW_EVIL_CONSTRUCTORS(name)
+#define CHECK(predicate)  SkASSERT(predicate)
+typedef uint8_t uint8;
+typedef uint32_t uint32;
+
+template <typename T> class scoped_array {
+private:
+  T* ptr_;
+  scoped_array(scoped_array const&);
+  scoped_array& operator=(const scoped_array&);
+
+public:
+  explicit scoped_array(T* p = 0) : ptr_(p) {}
+  ~scoped_array() {
+    delete[] ptr_;
+  }
+
+  void reset(T* p = 0) {
+    if (p != ptr_) {
+      delete[] ptr_;
+      ptr_ = p;
+    }
+  }
+
+  T& operator[](int i) const {
+    return ptr_[i];
+  }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace image_codec {
+
+class BmpDecoderCallback {
+ public:
+  BmpDecoderCallback() { }
+  virtual ~BmpDecoderCallback() {}
+
+  /**
+   * This is called once for an image. It is passed the width and height and
+   * should return the address of a buffer that is large enough to store
+   * all of the resulting pixels (widht * height * 3 bytes). If it returns nullptr,
+   * then the decoder will abort, but return true, as the caller has received
+   * valid dimensions.
+   */
+  virtual uint8* SetSize(int width, int height) = 0;
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderCallback);
+};
+
+class BmpDecoderHelper {
+ public:
+  BmpDecoderHelper() { }
+  ~BmpDecoderHelper() { }
+  bool DecodeImage(const char* data,
+                   size_t len,
+                   int max_pixels,
+                   BmpDecoderCallback* callback);
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderHelper);
+
+  void DoRLEDecode();
+  void DoStandardDecode();
+  void PutPixel(int x, int y, uint8 col);
+
+  int GetInt();
+  int GetShort();
+  uint8 GetByte();
+  int CalcShiftRight(uint32 mask);
+  int CalcShiftLeft(uint32 mask);
+
+  const uint8* data_;
+  size_t pos_;
+  size_t len_;
+  int width_;
+  int height_;
+  int bpp_;
+  int pixelPad_;
+  int rowPad_;
+  scoped_array<uint8> colTab_;
+  uint32 redBits_;
+  uint32 greenBits_;
+  uint32 blueBits_;
+  int redShiftRight_;
+  int greenShiftRight_;
+  int blueShiftRight_;
+  int redShiftLeft_;
+  int greenShiftLeft_;
+  int blueShiftLeft_;
+  uint8* output_;
+  bool inverted_;
+};
+
+} // namespace
+
+#endif