gfx/thebes/RoundedRect.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "gfxRect.h"
   7
   8 namespace mozilla {
   9 /* A rounded rectangle abstraction.
  10  *
  11  * This can represent a rectangle with a different pair of radii on each corner.
  12  *
  13  * Note: CoreGraphics and Direct2D only support rounded rectangle with the same
  14  * radii on all corners. However, supporting CSS's border-radius requires the extra flexibility. */
  15 struct RoundedRect {
  16     RoundedRect(gfxRect &aRect, gfxCornerSizes &aCorners) : rect(aRect), corners(aCorners) { }
  17     void Deflate(gfxFloat aTopWidth, gfxFloat aBottomWidth, gfxFloat aLeftWidth, gfxFloat aRightWidth) {
  18         // deflate the internal rect
  19         rect.x += aLeftWidth;
  20         rect.y += aTopWidth;
  21         rect.width = std::max(0., rect.width - aLeftWidth - aRightWidth);
  22         rect.height = std::max(0., rect.height - aTopWidth - aBottomWidth);
  23
  24         corners.sizes[NS_CORNER_TOP_LEFT].width  = std::max(0., corners.sizes[NS_CORNER_TOP_LEFT].width - aLeftWidth);
  25         corners.sizes[NS_CORNER_TOP_LEFT].height = std::max(0., corners.sizes[NS_CORNER_TOP_LEFT].height - aTopWidth);
  26
  27         corners.sizes[NS_CORNER_TOP_RIGHT].width  = std::max(0., corners.sizes[NS_CORNER_TOP_RIGHT].width - aRightWidth);
  28         corners.sizes[NS_CORNER_TOP_RIGHT].height = std::max(0., corners.sizes[NS_CORNER_TOP_RIGHT].height - aTopWidth);
  29
  30         corners.sizes[NS_CORNER_BOTTOM_LEFT].width  = std::max(0., corners.sizes[NS_CORNER_BOTTOM_LEFT].width - aLeftWidth);
  31         corners.sizes[NS_CORNER_BOTTOM_LEFT].height = std::max(0., corners.sizes[NS_CORNER_BOTTOM_LEFT].height - aBottomWidth);
  32
  33         corners.sizes[NS_CORNER_BOTTOM_RIGHT].width  = std::max(0., corners.sizes[NS_CORNER_BOTTOM_RIGHT].width - aRightWidth);
  34         corners.sizes[NS_CORNER_BOTTOM_RIGHT].height = std::max(0., corners.sizes[NS_CORNER_BOTTOM_RIGHT].height - aBottomWidth);
  35     }
  36     gfxRect rect;
  37     gfxCornerSizes corners;
  38 };
  39
  40 } // namespace mozilla