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 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 163