1/*
2 * Copyright (C) 2010 Igalia S.L.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CairoUtilities.h"
28
29#include "AffineTransform.h"
30#include "Color.h"
31#include "FloatPoint.h"
32#include "FloatRect.h"
33#include "IntRect.h"
34#include "OwnPtrCairo.h"
35#include "Path.h"
36#include "PlatformPathCairo.h"
37#include "RefPtrCairo.h"
38#include <wtf/Vector.h>
39
40namespace WebCore {
41
42void copyContextProperties(cairo_t* srcCr, cairo_t* dstCr)
43{
44    cairo_set_antialias(dstCr, cairo_get_antialias(srcCr));
45
46    size_t dashCount = cairo_get_dash_count(srcCr);
47    Vector<double> dashes(dashCount);
48
49    double offset;
50    cairo_get_dash(srcCr, dashes.data(), &offset);
51    cairo_set_dash(dstCr, dashes.data(), dashCount, offset);
52    cairo_set_line_cap(dstCr, cairo_get_line_cap(srcCr));
53    cairo_set_line_join(dstCr, cairo_get_line_join(srcCr));
54    cairo_set_line_width(dstCr, cairo_get_line_width(srcCr));
55    cairo_set_miter_limit(dstCr, cairo_get_miter_limit(srcCr));
56    cairo_set_fill_rule(dstCr, cairo_get_fill_rule(srcCr));
57}
58
59void setSourceRGBAFromColor(cairo_t* context, const Color& color)
60{
61    float red, green, blue, alpha;
62    color.getRGBA(red, green, blue, alpha);
63    cairo_set_source_rgba(context, red, green, blue, alpha);
64}
65
66void appendPathToCairoContext(cairo_t* to, cairo_t* from)
67{
68    OwnPtr<cairo_path_t> cairoPath(cairo_copy_path(from));
69    cairo_append_path(to, cairoPath.get());
70}
71
72void setPathOnCairoContext(cairo_t* to, cairo_t* from)
73{
74    cairo_new_path(to);
75    appendPathToCairoContext(to, from);
76}
77
78void appendWebCorePathToCairoContext(cairo_t* context, const Path& path)
79{
80    appendPathToCairoContext(context, path.platformPath()->context());
81}
82
83cairo_operator_t toCairoOperator(CompositeOperator op)
84{
85    switch (op) {
86    case CompositeClear:
87        return CAIRO_OPERATOR_CLEAR;
88    case CompositeCopy:
89        return CAIRO_OPERATOR_SOURCE;
90    case CompositeSourceOver:
91        return CAIRO_OPERATOR_OVER;
92    case CompositeSourceIn:
93        return CAIRO_OPERATOR_IN;
94    case CompositeSourceOut:
95        return CAIRO_OPERATOR_OUT;
96    case CompositeSourceAtop:
97        return CAIRO_OPERATOR_ATOP;
98    case CompositeDestinationOver:
99        return CAIRO_OPERATOR_DEST_OVER;
100    case CompositeDestinationIn:
101        return CAIRO_OPERATOR_DEST_IN;
102    case CompositeDestinationOut:
103        return CAIRO_OPERATOR_DEST_OUT;
104    case CompositeDestinationAtop:
105        return CAIRO_OPERATOR_DEST_ATOP;
106    case CompositeXOR:
107        return CAIRO_OPERATOR_XOR;
108    case CompositePlusDarker:
109#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 10, 0)
110        return CAIRO_OPERATOR_DARKEN;
111#else
112        return CAIRO_OPERATOR_SATURATE;
113#endif
114    case CompositeHighlight:
115        // There is no Cairo equivalent for CompositeHighlight.
116        return CAIRO_OPERATOR_OVER;
117    case CompositePlusLighter:
118        return CAIRO_OPERATOR_ADD;
119    default:
120        return CAIRO_OPERATOR_SOURCE;
121    }
122}
123
124void drawPatternToCairoContext(cairo_t* cr, cairo_surface_t* image, const IntSize& imageSize, const FloatRect& tileRect,
125                               const AffineTransform& patternTransform, const FloatPoint& phase, cairo_operator_t op, const FloatRect& destRect)
126{
127    // Avoid NaN
128    if (!isfinite(phase.x()) || !isfinite(phase.y()))
129       return;
130
131    cairo_save(cr);
132
133    RefPtr<cairo_surface_t> clippedImageSurface = 0;
134    if (tileRect.size() != imageSize) {
135        IntRect imageRect = enclosingIntRect(tileRect);
136        clippedImageSurface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, imageRect.width(), imageRect.height()));
137        RefPtr<cairo_t> clippedImageContext = adoptRef(cairo_create(clippedImageSurface.get()));
138        cairo_set_source_surface(clippedImageContext.get(), image, -tileRect.x(), -tileRect.y());
139        cairo_paint(clippedImageContext.get());
140        image = clippedImageSurface.get();
141    }
142
143    cairo_pattern_t* pattern = cairo_pattern_create_for_surface(image);
144    cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
145
146    cairo_matrix_t patternMatrix = cairo_matrix_t(patternTransform);
147    cairo_matrix_t phaseMatrix = {1, 0, 0, 1, phase.x() + tileRect.x() * patternTransform.a(), phase.y() + tileRect.y() * patternTransform.d()};
148    cairo_matrix_t combined;
149    cairo_matrix_multiply(&combined, &patternMatrix, &phaseMatrix);
150    cairo_matrix_invert(&combined);
151    cairo_pattern_set_matrix(pattern, &combined);
152
153    cairo_set_operator(cr, op);
154    cairo_set_source(cr, pattern);
155    cairo_pattern_destroy(pattern);
156    cairo_rectangle(cr, destRect.x(), destRect.y(), destRect.width(), destRect.height());
157    cairo_fill(cr);
158
159    cairo_restore(cr);
160}
161
162} // namespace WebCore
163