Changes look for scrollbars on windows (2)

ui/gfx/nine_image_painter.cc

+// 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 "ui/gfx/nine_image_painter.h"
+
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia_operations.h"
+#include "ui/gfx/insets.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/scoped_canvas.h"
+
+namespace gfx {
+
+NineImagePainter::NineImagePainter(const std::vector<ImageSkia>& images) {
+  DCHECK_EQ(arraysize(images_), images.size());
+  for (size_t i = 0; i < arraysize(images_); ++i)
+    images_[i] = images[i];
+}
+
+NineImagePainter::NineImagePainter(const ImageSkia& image,
+                                   const Insets& insets) {
+  DCHECK_GE(image.width(), insets.width());
+  DCHECK_GE(image.height(), insets.height());
+
+  // Extract subsets of the original image to match the |images_| format.
+  const int x[] =
+      { 0, insets.left(), image.width() - insets.right(), image.width() };
+  const int y[] =
+      { 0, insets.top(), image.height() - insets.bottom(), image.height() };
+
+  for (size_t j = 0; j < 3; ++j) {
+    for (size_t i = 0; i < 3; ++i) {
+      images_[i + j * 3] = ImageSkiaOperations::ExtractSubset(image,
+          Rect(x[i], y[j], x[i + 1] - x[i], y[j + 1] - y[j]));
+    }
+  }
+}
+
+NineImagePainter::~NineImagePainter() {
+}
+
+bool NineImagePainter::IsEmpty() const {
+  return images_[0].isNull();
+}
+
+Size NineImagePainter::GetMinimumSize() const {
+  return IsEmpty() ? Size() : Size(
+      images_[0].width() + images_[1].width() + images_[2].width(),
+      images_[0].height() + images_[3].height() + images_[6].height());
+}
+
+void NineImagePainter::Paint(Canvas* canvas, const Rect& bounds) {
+  if (IsEmpty())
+    return;
+
+  ScopedCanvas scoped_canvas(canvas);
+  canvas->Translate(bounds.OffsetFromOrigin());
+
+  // In case the corners and edges don't all have the same width/height, we draw
+  // the center first, and extend it out in all directions to the edges of the
+  // images with the smallest widths/heights.  This way there will be no
+  // unpainted areas, though some corners or edges might overlap the center.
+  int w = bounds.width();
+  int i0w = images_[0].width();
+  int i2w = images_[2].width();
+  int i3w = images_[3].width();
+  int i5w = images_[5].width();
+  int i6w = images_[6].width();
+  int i8w = images_[8].width();
+  int i4x = std::min(std::min(i0w, i3w), i6w);
+  int i4w = w - i4x - std::min(std::min(i2w, i5w), i8w);
+  int h = bounds.height();
+  int i0h = images_[0].height();
+  int i1h = images_[1].height();
+  int i2h = images_[2].height();
+  int i6h = images_[6].height();
+  int i7h = images_[7].height();
+  int i8h = images_[8].height();
+  int i4y = std::min(std::min(i0h, i1h), i2h);
+  int i4h = h - i4y - std::min(std::min(i6h, i7h), i8h);
+  if (!images_[4].isNull())
+    Fill(canvas, images_[4], i4x, i4y, i4w, i4h);
+  canvas->DrawImageInt(images_[0], 0, 0);
+  Fill(canvas, images_[1], i0w, 0, w - i0w - i2w, i1h);
+  canvas->DrawImageInt(images_[2], w - i2w, 0);
+  Fill(canvas, images_[3], 0, i0h, i3w, h - i0h - i6h);
+  Fill(canvas, images_[5], w - i5w, i2h, i5w, h - i2h - i8h);
+  canvas->DrawImageInt(images_[6], 0, h - i6h);
+  Fill(canvas, images_[7], i6w, h - i7h, w - i6w - i8w, i7h);
+  canvas->DrawImageInt(images_[8], w - i8w, h - i8h);
+}
+
+// static
+void NineImagePainter::Fill(Canvas* c,
+                            const ImageSkia& i,
+                            int x,
+                            int y,
+                            int w,
+                            int h) {
+  c->DrawImageInt(i, 0, 0, i.width(), i.height(), x, y, w, h, false);
+}
+
+}  // namespace gfx