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
40 namespace WebCore {
41
copyContextProperties(cairo_t * srcCr,cairo_t * dstCr)42 void 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
setSourceRGBAFromColor(cairo_t * context,const Color & color)59 void 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
appendPathToCairoContext(cairo_t * to,cairo_t * from)66 void 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
setPathOnCairoContext(cairo_t * to,cairo_t * from)72 void setPathOnCairoContext(cairo_t* to, cairo_t* from)
73 {
74 cairo_new_path(to);
75 appendPathToCairoContext(to, from);
76 }
77
appendWebCorePathToCairoContext(cairo_t * context,const Path & path)78 void appendWebCorePathToCairoContext(cairo_t* context, const Path& path)
79 {
80 appendPathToCairoContext(context, path.platformPath()->context());
81 }
82
toCairoOperator(CompositeOperator op)83 cairo_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
drawPatternToCairoContext(cairo_t * cr,cairo_surface_t * image,const IntSize & imageSize,const FloatRect & tileRect,const AffineTransform & patternTransform,const FloatPoint & phase,cairo_operator_t op,const FloatRect & destRect)124 void 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