[Telemetry] Migrate bitmap.py from bitmaptools.cc to numpy

tools/telemetry/telemetry/core/bitmaptools.cc

Index: tools/telemetry/telemetry/core/bitmaptools.cc
diff --git a/tools/telemetry/telemetry/core/bitmaptools.cc b/tools/telemetry/telemetry/core/bitmaptools.cc
deleted file mode 100644
index ba4a8a59101e0c0d5274048d2797cd83b42804f8..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/core/bitmaptools.cc
+++ /dev/null
@@ -1,264 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if defined(WIN32)
-#include <fcntl.h>
-#include <io.h>
-#endif
-
-enum Commands {
-  CROP_PIXELS = 0,
-  HISTOGRAM = 1,
-  BOUNDING_BOX = 2
-};
-
-bool ReadInt(int* out) {
-  return fread(out, sizeof(*out), 1, stdin) == 1;
-}
-
-void WriteResponse(void* data, int size) {
-  fwrite(&size, sizeof(size), 1, stdout);
-  fwrite(data, size, 1, stdout);
-  fflush(stdout);
-}
-
-struct Box {
-  Box() : left(), top(), right(), bottom() {}
-
-  // Expected input is:
-  // left, top, width, height
-  bool Read() {
-    int width;
-    int height;
-    if (!(ReadInt(&left) && ReadInt(&top) &&
-          ReadInt(&width) && ReadInt(&height))) {
-      fprintf(stderr, "Could not parse Box.\n");
-      return false;
-    }
-    if (left < 0 || top < 0 || width < 0 || height < 0) {
-      fprintf(stderr, "Box dimensions must be non-negative.\n");
-      return false;
-    }
-    right = left + width;
-    bottom = top + height;
-    return true;
-  }
-
-  void Union(int x, int y) {
-    if (left > x) left = x;
-    if (right <= x) right = x + 1;
-    if (top > y) top = y;
-    if (bottom <= y) bottom = y + 1;
-  }
-
-  int width() const { return right - left; }
-  int height() const { return bottom - top; }
-
-  int left;
-  int top;
-  int right;
-  int bottom;
-};
-
-
-// Represents a bitmap buffer with a crop box.
-struct Bitmap {
-  Bitmap() : pixels(NULL) {}
-
-  ~Bitmap() {
-    if (pixels)
-      delete[] pixels;
-  }
-
-  // Expected input is:
-  // bpp, width, height, box, pixels
-  bool Read() {
-    int bpp;
-    int width;
-    int height;
-    if (!(ReadInt(&bpp) && ReadInt(&width) && ReadInt(&height))) {
-      fprintf(stderr, "Could not parse Bitmap initializer.\n");
-      return false;
-    }
-    if (bpp <= 0 || width <= 0 || height <= 0) {
-      fprintf(stderr, "Dimensions must be positive.\n");
-      return false;
-    }
-
-    int size = width * height * bpp;
-
-    row_stride = width * bpp;
-    pixel_stride = bpp;
-    total_size = size;
-    row_size = row_stride;
-
-    if (!box.Read()) {
-      fprintf(stderr, "Expected crop box argument not found.\n");
-      return false;
-    }
-
-    if (box.bottom * row_stride > total_size ||
-        box.right * pixel_stride > row_size) {
-      fprintf(stderr, "Crop box overflows the bitmap.\n");
-      return false;
-    }
-
-    pixels = new unsigned char[size];
-    if (fread(pixels, sizeof(pixels[0]), size, stdin) <
-        static_cast<size_t>(size)) {
-      fprintf(stderr, "Not enough pixels found,\n");
-      return false;
-    }
-
-    total_size = (box.bottom - box.top) * row_stride;
-    row_size = (box.right - box.left) * pixel_stride;
-    data = pixels + box.top * row_stride + box.left * pixel_stride;
-    return true;
-  }
-
-  void WriteCroppedPixels() const {
-    int out_size = row_size * box.height();
-    unsigned char* out = new unsigned char[out_size];
-    unsigned char* dst = out;
-    for (const unsigned char* row = data;
-        row < data + total_size;
-        row += row_stride, dst += row_size) {
-      // No change in pixel_stride, so we can copy whole rows.
-      memcpy(dst, row, row_size);
-    }
-
-    WriteResponse(out, out_size);
-    delete[] out;
-  }
-
-  unsigned char* pixels;
-  Box box;
-  // Points at the top-left pixel in |pixels|.
-  const unsigned char* data;
-  // These counts are in bytes.
-  int row_stride;
-  int pixel_stride;
-  int total_size;
-  int row_size;
-};
-
-
-static inline
-bool PixelsEqual(const unsigned char* pixel1, const unsigned char* pixel2,
-                 int tolerance) {
-  // Note: this works for both RGB and RGBA. Alpha channel is ignored.
-  return (abs(pixel1[0] - pixel2[0]) <= tolerance) &&
-         (abs(pixel1[1] - pixel2[1]) <= tolerance) &&
-         (abs(pixel1[2] - pixel2[2]) <= tolerance);
-}
-
-
-static inline
-bool PixelsEqual(const unsigned char* pixel, int color, int tolerance) {
-  unsigned char pixel2[3] = { color >> 16, color >> 8, color };
-  return PixelsEqual(pixel, pixel2, tolerance);
-}
-
-
-static
-bool Histogram(const Bitmap& bmp) {
-  int ignore_color;
-  int tolerance;
-  if (!(ReadInt(&ignore_color) && ReadInt(&tolerance))) {
-    fprintf(stderr, "Could not parse HISTOGRAM command.\n");
-    return false;
-  }
-
-  const int kLength = 3 * 256;
-  int counts[kLength] = {};
-
-  for (const unsigned char* row = bmp.data; row < bmp.data + bmp.total_size;
-       row += bmp.row_stride) {
-    for (const unsigned char* pixel = row; pixel < row + bmp.row_size;
-       pixel += bmp.pixel_stride) {
-      if (ignore_color >= 0 && PixelsEqual(pixel, ignore_color, tolerance))
-        continue;
-      ++(counts[256 * 0 + pixel[0]]);
-      ++(counts[256 * 1 + pixel[1]]);
-      ++(counts[256 * 2 + pixel[2]]);
-    }
-  }
-
-  WriteResponse(counts, sizeof(counts));
-  return true;
-}
-
-
-static
-bool BoundingBox(const Bitmap& bmp) {
-  int color;
-  int tolerance;
-  if (!(ReadInt(&color) && ReadInt(&tolerance))) {
-    fprintf(stderr, "Could not parse BOUNDING_BOX command.\n");
-    return false;
-  }
-
-  Box box;
-  box.left = bmp.total_size;
-  box.top = bmp.total_size;
-  box.right = 0;
-  box.bottom = 0;
-
-  int count = 0;
-  int y = 0;
-  for (const unsigned char* row = bmp.data; row < bmp.data + bmp.total_size;
-       row += bmp.row_stride, ++y) {
-    int x = 0;
-    for (const unsigned char* pixel = row; pixel < row + bmp.row_size;
-         pixel += bmp.pixel_stride, ++x) {
-      if (!PixelsEqual(pixel, color, tolerance))
-        continue;
-      box.Union(x, y);
-      ++count;
-    }
-  }
-
-  int response[] = { box.left, box.top, box.width(), box.height(), count };
-  WriteResponse(response, sizeof(response));
-  return true;
-}
-
-
-int main() {
-  Bitmap bmp;
-  int command;
-
-#if defined(WIN32)
-  _setmode(_fileno(stdin), _O_BINARY);
-  _setmode(_fileno(stdout), _O_BINARY);
-#else
-  FILE* unused_stdin = freopen(NULL, "rb", stdin);
-  FILE* unused_stdout = freopen(NULL, "wb", stdout);
-#endif
-
-  if (!bmp.Read()) return -1;
-  if (!ReadInt(&command)) {
-    fprintf(stderr, "Expected command.\n");
-    return -1;
-  }
-  switch (command) {
-    case CROP_PIXELS:
-      bmp.WriteCroppedPixels();
-      break;
-    case BOUNDING_BOX:
-      if (!BoundingBox(bmp)) return -1;
-      break;
-    case HISTOGRAM:
-      if (!Histogram(bmp)) return -1;
-      break;
-    default:
-      fprintf(stderr, "Unrecognized command\n");
-      return -1;
-  }
-  return 0;
-}