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Merge WebKit at r78450: Initial merge by git.
[android-x86/external-webkit.git] / Source / WebCore / platform / graphics / cairo / CairoUtilities.cpp
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 "CairoPath.h"
31 #include "Color.h"
32 #include "FloatPoint.h"
33 #include "FloatRect.h"
34 #include "IntRect.h"
35 #include "OwnPtrCairo.h"
36 #include "Path.h"
37 #include "RefPtrCairo.h"
38 #include <wtf/Vector.h>
39
40 namespace WebCore {
41
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
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
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
72 void setPathOnCairoContext(cairo_t* to, cairo_t* from)
73 {
74     cairo_new_path(to);
75     appendPathToCairoContext(to, from);
76 }
77
78 void appendWebCorePathToCairoContext(cairo_t* context, const Path& path)
79 {
80     appendPathToCairoContext(context, path.platformPath()->context());
81 }
82
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
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