1/*
2 * Copyright (C) 2009 Apple Inc. All rights reserved.
3 *           (C) 2009 Brent Fulgham <bfulgham@webkit.org>
4 *           (C) 2010 Igalia S.L
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1.  Redistributions of source code must retain the above copyright
11 *     notice, this list of conditions and the following disclaimer.
12 * 2.  Redistributions in binary form must reproduce the above copyright
13 *     notice, this list of conditions and the following disclaimer in the
14 *     documentation and/or other materials provided with the distribution.
15 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
16 *     its contributors may be used to endorse or promote products derived
17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "PixelDumpSupportCairo.h"
33
34#include "DumpRenderTree.h"
35#include "PixelDumpSupport.h"
36#include <algorithm>
37#include <ctype.h>
38#include <wtf/Assertions.h>
39#include <wtf/MD5.h>
40#include <wtf/RefPtr.h>
41#include <wtf/StringExtras.h>
42
43using namespace std;
44
45static cairo_status_t writeFunction(void* closure, const unsigned char* data, unsigned int length)
46{
47    Vector<unsigned char>* in = reinterpret_cast<Vector<unsigned char>*>(closure);
48    in->append(data, length);
49    return CAIRO_STATUS_SUCCESS;
50}
51
52static void printPNG(cairo_surface_t* image, const char* checksum)
53{
54    Vector<unsigned char> pixelData;
55    // Only PNG output is supported for now.
56    cairo_surface_write_to_png_stream(image, writeFunction, &pixelData);
57
58    const size_t dataLength = pixelData.size();
59    const unsigned char* data = pixelData.data();
60
61    printPNG(data, dataLength, checksum);
62}
63
64void computeMD5HashStringForBitmapContext(BitmapContext* context, char hashString[33])
65{
66    cairo_t* bitmapContext = context->cairoContext();
67    cairo_surface_t* surface = cairo_get_target(bitmapContext);
68
69    ASSERT(cairo_image_surface_get_format(surface) == CAIRO_FORMAT_ARGB32); // ImageDiff assumes 32 bit RGBA, we must as well.
70
71    size_t pixelsHigh = cairo_image_surface_get_height(surface);
72    size_t pixelsWide = cairo_image_surface_get_width(surface);
73    size_t bytesPerRow = cairo_image_surface_get_stride(surface);
74
75    MD5 md5Context;
76    unsigned char* bitmapData = static_cast<unsigned char*>(cairo_image_surface_get_data(surface));
77    for (unsigned row = 0; row < pixelsHigh; row++) {
78        md5Context.addBytes(bitmapData, 4 * pixelsWide);
79        bitmapData += bytesPerRow;
80    }
81    Vector<uint8_t, 16> hash;
82    md5Context.checksum(hash);
83
84    snprintf(hashString, 33, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
85        hash[0], hash[1], hash[2], hash[3], hash[4], hash[5], hash[6], hash[7],
86        hash[8], hash[9], hash[10], hash[11], hash[12], hash[13], hash[14], hash[15]);
87}
88
89void dumpBitmap(BitmapContext* context, const char* checksum)
90{
91    cairo_surface_t* surface = cairo_get_target(context->cairoContext());
92    printPNG(surface, checksum);
93}
94