remove unused draw utils in pdf

pdf/draw_utils.cc

Index: pdf/draw_utils.cc
diff --git a/pdf/draw_utils.cc b/pdf/draw_utils.cc
index 5d13077e1189244113dbcda17ebcc69f692922b5..79241a2af4af6492fa72914125f7f7da7b0ded34 100644
--- a/pdf/draw_utils.cc
+++ b/pdf/draw_utils.cc
@@ -41,15 +41,6 @@ inline uint32_t MakePixel(uint8_t red,
       static_cast<uint32_t>(blue);
 }
 
-inline uint8_t GradientChannel(uint8_t start, uint8_t end, double ratio) {
-  double new_channel = start - (static_cast<double>(start) - end) * ratio;
-  if (new_channel < 0)
-    return 0;
-  if (new_channel > 255)
-    return 255;
-  return static_cast<uint8_t>(new_channel + 0.5);
-}
-
 inline uint8_t ProcessColor(uint8_t src_color,
                             uint8_t dest_color,
                             uint8_t alpha) {
@@ -58,183 +49,6 @@ inline uint8_t ProcessColor(uint8_t src_color,
   return static_cast<uint8_t>((processed / 0xFF) & 0xFF);
 }
 
-inline bool ImageDataContainsRect(const pp::ImageData& image_data,
-                                  const pp::Rect& rect) {
-  return rect.width() >= 0 && rect.height() >= 0 &&
-      pp::Rect(image_data.size()).Contains(rect);
-}
-
-void AlphaBlend(const pp::ImageData& src,
-                const pp::Rect& src_rc,
-                pp::ImageData* dest,
-                const pp::Point& dest_origin,
-                uint8_t alpha_adjustment) {
-  if (src_rc.IsEmpty() || !ImageDataContainsRect(src, src_rc))
-    return;
-
-  pp::Rect dest_rc(dest_origin, src_rc.size());
-  if (dest_rc.IsEmpty() || !ImageDataContainsRect(*dest, dest_rc))
-    return;
-
-  const uint32_t* src_origin_pixel = src.GetAddr32(src_rc.point());
-  uint32_t* dest_origin_pixel = dest->GetAddr32(dest_origin);
-
-  int height = src_rc.height();
-  int width = src_rc.width();
-  for (int y = 0; y < height; y++) {
-    const uint32_t* src_pixel = src_origin_pixel;
-    uint32_t* dest_pixel = dest_origin_pixel;
-    for (int x = 0; x < width; x++) {
-      uint8_t alpha =
-          static_cast<uint8_t>(static_cast<uint32_t>(alpha_adjustment) *
-                               GetAlpha(*src_pixel) / 0xFF);
-      uint8_t red =
-          ProcessColor(GetRed(*src_pixel), GetRed(*dest_pixel), alpha);
-      uint8_t green =
-          ProcessColor(GetGreen(*src_pixel), GetGreen(*dest_pixel), alpha);
-      uint8_t blue =
-          ProcessColor(GetBlue(*src_pixel), GetBlue(*dest_pixel), alpha);
-      *dest_pixel = MakePixel(red, green, blue, GetAlpha(*dest_pixel));
-
-      src_pixel++;
-      dest_pixel++;
-    }
-    src_origin_pixel = reinterpret_cast<const uint32_t*>(
-        reinterpret_cast<const char*>(src_origin_pixel) + src.stride());
-    dest_origin_pixel = reinterpret_cast<uint32_t*>(
-        reinterpret_cast<char*>(dest_origin_pixel) + dest->stride());
-  }
-}
-
-void GradientFill(pp::ImageData* image,
-                  const pp::Rect& rc,
-                  uint32_t start_color,
-                  uint32_t end_color,
-                  bool horizontal) {
-  std::vector<uint32_t> colors;
-  colors.resize(horizontal ? rc.width() : rc.height());
-  for (size_t i = 0; i < colors.size(); ++i) {
-    double ratio = static_cast<double>(i) / colors.size();
-    colors[i] = MakePixel(
-        GradientChannel(GetRed(start_color), GetRed(end_color), ratio),
-        GradientChannel(GetGreen(start_color), GetGreen(end_color), ratio),
-        GradientChannel(GetBlue(start_color), GetBlue(end_color), ratio),
-        GradientChannel(GetAlpha(start_color), GetAlpha(end_color), ratio));
-  }
-
-  if (horizontal) {
-    const void* data = &(colors[0]);
-    size_t size = colors.size() * 4;
-    uint32_t* origin_pixel = image->GetAddr32(rc.point());
-    for (int y = 0; y < rc.height(); y++) {
-      memcpy(origin_pixel, data, size);
-      origin_pixel = reinterpret_cast<uint32_t*>(
-          reinterpret_cast<char*>(origin_pixel) + image->stride());
-    }
-  } else {
-    uint32_t* origin_pixel = image->GetAddr32(rc.point());
-    for (int y = 0; y < rc.height(); y++) {
-      uint32_t* pixel = origin_pixel;
-      for (int x = 0; x < rc.width(); x++) {
-        *pixel = colors[y];
-        pixel++;
-      }
-      origin_pixel = reinterpret_cast<uint32_t*>(
-          reinterpret_cast<char*>(origin_pixel) + image->stride());
-    }
-  }
-}
-
-void GradientFill(pp::Instance* instance,
-                  pp::ImageData* image,
-                  const pp::Rect& dirty_rc,
-                  const pp::Rect& gradient_rc,
-                  uint32_t start_color,
-                  uint32_t end_color,
-                  bool horizontal,
-                  uint8_t transparency) {
-  pp::Rect draw_rc = gradient_rc.Intersect(dirty_rc);
-  if (draw_rc.IsEmpty())
-    return;
-
-  pp::ImageData gradient(instance, PP_IMAGEDATAFORMAT_BGRA_PREMUL,
-      gradient_rc.size(), false);
-
-  GradientFill(&gradient, pp::Rect(pp::Point(), gradient_rc.size()),
-               start_color, end_color, horizontal);
-
-  pp::Rect copy_rc(draw_rc);
-  copy_rc.Offset(-gradient_rc.x(), -gradient_rc.y());
-  AlphaBlend(gradient, copy_rc, image, draw_rc.point(), transparency);
-}
-
-void CopyImage(const pp::ImageData& src, const pp::Rect& src_rc,
-               pp::ImageData* dest, const pp::Rect& dest_rc,
-               bool stretch) {
-  if (src_rc.IsEmpty() || !ImageDataContainsRect(src, src_rc))
-    return;
-
-  pp::Rect stretched_rc(dest_rc.point(),
-                        stretch ? dest_rc.size() : src_rc.size());
-  if (stretched_rc.IsEmpty() || !ImageDataContainsRect(*dest, stretched_rc))
-    return;
-
-  const uint32_t* src_origin_pixel = src.GetAddr32(src_rc.point());
-  uint32_t* dest_origin_pixel = dest->GetAddr32(dest_rc.point());
-  if (stretch) {
-    double x_ratio = static_cast<double>(src_rc.width()) / dest_rc.width();
-    double y_ratio = static_cast<double>(src_rc.height()) / dest_rc.height();
-    int32_t height = dest_rc.height();
-    int32_t width = dest_rc.width();
-    for (int32_t y = 0; y < height; ++y) {
-      uint32_t* dest_pixel = dest_origin_pixel;
-      for (int32_t x = 0; x < width; ++x) {
-        uint32_t src_x = static_cast<uint32_t>(x * x_ratio);
-        uint32_t src_y = static_cast<uint32_t>(y * y_ratio);
-        const uint32_t* src_pixel = src.GetAddr32(
-            pp::Point(src_rc.x() + src_x, src_rc.y() + src_y));
-        *dest_pixel = *src_pixel;
-        dest_pixel++;
-      }
-      dest_origin_pixel = reinterpret_cast<uint32_t*>(
-          reinterpret_cast<char*>(dest_origin_pixel) + dest->stride());
-    }
-  } else {
-    int32_t height = src_rc.height();
-    base::CheckedNumeric<int32_t> width_bytes = src_rc.width();
-    width_bytes *= 4;
-    for (int32_t y = 0; y < height; ++y) {
-      memcpy(dest_origin_pixel, src_origin_pixel, width_bytes.ValueOrDie());
-      src_origin_pixel = reinterpret_cast<const uint32_t*>(
-          reinterpret_cast<const char*>(src_origin_pixel) + src.stride());
-      dest_origin_pixel = reinterpret_cast<uint32_t*>(
-          reinterpret_cast<char*>(dest_origin_pixel) + dest->stride());
-    }
-  }
-}
-
-void FillRect(pp::ImageData* image, const pp::Rect& rc, uint32_t color) {
-  int height = rc.height();
-  if (height == 0)
-    return;
-
-  // Fill in first row.
-  uint32_t* top_line = image->GetAddr32(rc.point());
-  int width = rc.width();
-  for (int x = 0; x < width; x++)
-    top_line[x] = color;
-
-  // Fill in the rest of the rectangle.
-  int byte_width = width * 4;
-  uint32_t* cur_line = reinterpret_cast<uint32_t*>(
-          reinterpret_cast<char*>(top_line) + image->stride());
-  for (int y = 1; y < height; y++) {
-    memcpy(cur_line, top_line, byte_width);
-    cur_line = reinterpret_cast<uint32_t*>(
-            reinterpret_cast<char*>(cur_line) + image->stride());
-  }
-}
-
 ShadowMatrix::ShadowMatrix(uint32_t depth, double factor, uint32_t background)
     : depth_(depth), factor_(factor), background_(background) {
   DCHECK(depth_ > 0);