gfx/src/nsScriptableRegion.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsScriptableRegion.h"
   8 #include <stdint.h>                     // for uint32_t
   9 #include <sys/types.h>                  // for int32_t
  10 #include "js/RootingAPI.h"              // for Rooted
  11 #include "js/Value.h"                   // for INT_TO_JSVAL, etc
  12 #include "jsapi.h"                      // for JS_DefineElement, etc
  13 #include "mozilla/Assertions.h"         // for MOZ_ASSERT_HELPER2
  14 #include "nsError.h"                    // for NS_OK, NS_ERROR_FAILURE, etc
  15 #include "nsID.h"
  16 #include "nsRect.h"                     // for nsIntRect
  17 #include "nscore.h"                     // for NS_IMETHODIMP
  18
  19 class JSObject;
  20 struct JSContext;
  21
  22 nsScriptableRegion::nsScriptableRegion()
  23 {
  24 }
  25
  26 NS_IMPL_ISUPPORTS(nsScriptableRegion, nsIScriptableRegion)
  27
  28 NS_IMETHODIMP nsScriptableRegion::Init()
  29 {
  30   return NS_OK;
  31 }
  32
  33 NS_IMETHODIMP nsScriptableRegion::SetToRegion(nsIScriptableRegion *aRegion)
  34 {
  35   aRegion->GetRegion(&mRegion);
  36   return NS_OK;
  37 }
  38
  39 NS_IMETHODIMP nsScriptableRegion::SetToRect(int32_t aX, int32_t aY, int32_t aWidth, int32_t aHeight)
  40 {
  41   mRegion = nsIntRect(aX, aY, aWidth, aHeight);
  42   return NS_OK;
  43 }
  44
  45 NS_IMETHODIMP nsScriptableRegion::IntersectRegion(nsIScriptableRegion *aRegion)
  46 {
  47   nsIntRegion region;
  48   aRegion->GetRegion(&region);
  49   mRegion.And(mRegion, region);
  50   return NS_OK;
  51 }
  52
  53 NS_IMETHODIMP nsScriptableRegion::IntersectRect(int32_t aX, int32_t aY, int32_t aWidth, int32_t aHeight)
  54 {
  55   mRegion.And(mRegion, nsIntRect(aX, aY, aWidth, aHeight));
  56   return NS_OK;
  57 }
  58
  59 NS_IMETHODIMP nsScriptableRegion::UnionRegion(nsIScriptableRegion *aRegion)
  60 {
  61   nsIntRegion region;
  62   aRegion->GetRegion(&region);
  63   mRegion.Or(mRegion, region);
  64   return NS_OK;
  65 }
  66
  67 NS_IMETHODIMP nsScriptableRegion::UnionRect(int32_t aX, int32_t aY, int32_t aWidth, int32_t aHeight)
  68 {
  69   mRegion.Or(mRegion, nsIntRect(aX, aY, aWidth, aHeight));
  70   return NS_OK;
  71 }
  72
  73 NS_IMETHODIMP nsScriptableRegion::SubtractRegion(nsIScriptableRegion *aRegion)
  74 {
  75   nsIntRegion region;
  76   aRegion->GetRegion(&region);
  77   mRegion.Sub(mRegion, region);
  78   return NS_OK;
  79 }
  80
  81 NS_IMETHODIMP nsScriptableRegion::SubtractRect(int32_t aX, int32_t aY, int32_t aWidth, int32_t aHeight)
  82 {
  83   mRegion.Sub(mRegion, nsIntRect(aX, aY, aWidth, aHeight));
  84   return NS_OK;
  85 }
  86
  87 NS_IMETHODIMP nsScriptableRegion::IsEmpty(bool *isEmpty)
  88 {
  89   *isEmpty = mRegion.IsEmpty();
  90   return NS_OK;
  91 }
  92
  93 NS_IMETHODIMP nsScriptableRegion::IsEqualRegion(nsIScriptableRegion *aRegion, bool *isEqual)
  94 {
  95   nsIntRegion region;
  96   aRegion->GetRegion(&region);
  97   *isEqual = mRegion.IsEqual(region);
  98   return NS_OK;
  99 }
 100
 101 NS_IMETHODIMP nsScriptableRegion::GetBoundingBox(int32_t *aX, int32_t *aY, int32_t *aWidth, int32_t *aHeight)
 102 {
 103   nsIntRect boundRect = mRegion.GetBounds();
 104   *aX = boundRect.x;
 105   *aY = boundRect.y;
 106   *aWidth = boundRect.width;
 107   *aHeight = boundRect.height;
 108   return NS_OK;
 109 }
 110
 111 NS_IMETHODIMP nsScriptableRegion::Offset(int32_t aXOffset, int32_t aYOffset)
 112 {
 113   mRegion.MoveBy(aXOffset, aYOffset);
 114   return NS_OK;
 115 }
 116
 117 NS_IMETHODIMP nsScriptableRegion::ContainsRect(int32_t aX, int32_t aY, int32_t aWidth, int32_t aHeight, bool *containsRect)
 118 {
 119   *containsRect = mRegion.Contains(nsIntRect(aX, aY, aWidth, aHeight));
 120   return NS_OK;
 121 }
 122
 123
 124 NS_IMETHODIMP nsScriptableRegion::GetRegion(nsIntRegion* outRgn)
 125 {
 126   *outRgn = mRegion;
 127   return NS_OK;
 128 }
 129
 130 NS_IMETHODIMP nsScriptableRegion::GetRects(JSContext* aCx, JS::MutableHandle<JS::Value> aRects)
 131 {
 132   uint32_t numRects = mRegion.GetNumRects();
 133
 134   if (!numRects) {
 135     aRects.setNull();
 136     return NS_OK;
 137   }
 138
 139   JS::Rooted<JSObject*> destArray(aCx, JS_NewArrayObject(aCx, numRects * 4));
 140   if (!destArray) {
 141     return NS_ERROR_OUT_OF_MEMORY;
 142   }
 143
 144   aRects.setObject(*destArray);
 145
 146   uint32_t n = 0;
 147   nsIntRegionRectIterator iter(mRegion);
 148   const nsIntRect *rect;
 149
 150   while ((rect = iter.Next())) {
 151     if (!JS_DefineElement(aCx, destArray, n, rect->x, JSPROP_ENUMERATE) ||
 152         !JS_DefineElement(aCx, destArray, n + 1, rect->y, JSPROP_ENUMERATE) ||
 153         !JS_DefineElement(aCx, destArray, n + 2, rect->width, JSPROP_ENUMERATE) ||
 154         !JS_DefineElement(aCx, destArray, n + 3, rect->height, JSPROP_ENUMERATE)) {
 155       return NS_ERROR_FAILURE;
 156     }
 157     n += 4;
 158   }
 159
 160   return NS_OK;
 161 }