gecko/layout/tools/reftest/nsReftestHelper.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is layout reftest.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vladimir Vukicevic <vladimir@pobox.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <string.h>
#include "nsIFactory.h"
#include "nsIGenericFactory.h"
#include "nsISupports.h"
#include "nsIDOMHTMLCanvasElement.h"
#include "nsIDOMCanvasRenderingContext2D.h"
#include "nsICanvasRenderingContextInternal.h"
#include "nsIReftestHelper.h"
#include "gfxContext.h"
#include "gfxImageSurface.h"
#include "nsStringGlue.h"
class nsReftestHelper :
public nsIReftestHelper
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIREFTESTHELPER
};
NS_IMPL_ISUPPORTS1(nsReftestHelper, nsIReftestHelper)
static already_AddRefed<gfxImageSurface>
CanvasToImageSurface(nsIDOMHTMLCanvasElement *canvas)
{
PRUint32 w, h;
nsresult rv;
nsCOMPtr<nsICanvasElement> elt = do_QueryInterface(canvas);
rv = elt->GetSize(&w, &h);
if (NS_FAILED(rv))
return nsnull;
nsCOMPtr<nsISupports> ctxg;
rv = canvas->GetContext(NS_LITERAL_STRING("2d"), getter_AddRefs(ctxg));
if (NS_FAILED(rv))
return nsnull;
nsCOMPtr<nsICanvasRenderingContextInternal> ctx = do_QueryInterface(ctxg);
if (ctx == nsnull)
return nsnull;
nsRefPtr<gfxImageSurface> img = new gfxImageSurface(gfxIntSize(w, h), gfxASurface::ImageFormatARGB32);
if (img == nsnull)
return nsnull;
nsRefPtr<gfxContext> t = new gfxContext(img);
if (t == nsnull)
return nsnull;
t->SetOperator(gfxContext::OPERATOR_CLEAR);
t->Paint();
rv = ctx->RenderToSurface(img->CairoSurface());
if (NS_FAILED(rv))
return nsnull;
NS_ADDREF(img.get());
return img.get();
}
NS_IMETHODIMP
nsReftestHelper::CompareCanvas(nsIDOMHTMLCanvasElement *canvas1,
nsIDOMHTMLCanvasElement *canvas2,
PRUint32 *result)
{
if (canvas1 == nsnull ||
canvas2 == nsnull ||
result == nsnull)
return NS_ERROR_FAILURE;
nsRefPtr<gfxImageSurface> img1 = CanvasToImageSurface(canvas1);
nsRefPtr<gfxImageSurface> img2 = CanvasToImageSurface(canvas2);
if (img1 == nsnull || img2 == nsnull ||
img1->GetSize() != img2->GetSize() ||
img1->Stride() != img2->Stride())
return NS_ERROR_FAILURE;
int v;
gfxIntSize size = img1->GetSize();
PRUint32 stride = img1->Stride();
// we can optimize for the common all-pass case
if (stride == size.width * 4) {
v = memcmp(img1->Data(), img2->Data(), size.width * size.height * 4);
if (v == 0) {
*result = 0;
return NS_OK;
}
}
PRUint32 different = 0;
for (int j = 0; j < size.height; j++) {
unsigned char *p1 = img1->Data() + j*stride;
unsigned char *p2 = img2->Data() + j*stride;
v = memcmp(p1, p2, stride);
if (v) {
for (int i = 0; i < size.width; i++) {
if (*(PRUint32*) p1 != *(PRUint32*) p2)
different++;
p1 += 4;
p2 += 4;
}
}
}
*result = different;
return NS_OK;
}
NS_GENERIC_FACTORY_CONSTRUCTOR(nsReftestHelper)
static const nsModuleComponentInfo components[] =
{
{ "nsReftestHelper",
{ 0x0269F9AD, 0xA2BD, 0x4AEA,
{ 0xB9, 0x2F, 0xCB, 0xF2, 0x23, 0x80, 0x94, 0x54 } },
"@mozilla.org/reftest-helper;1",
nsReftestHelperConstructor },
};
NS_IMPL_NSGETMODULE(nsReftestModule, components)