1 /* libs/graphics/svg/SkSVGGradient.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include "SkSVGGradient.h"
19 #include "SkSVGParser.h"
20 #include "SkSVGStop.h"
21
SkSVGGradient()22 SkSVGGradient::SkSVGGradient() {
23 }
24
getGradient()25 SkSVGElement* SkSVGGradient::getGradient() {
26 return this;
27 }
28
isDef()29 bool SkSVGGradient::isDef() {
30 return true;
31 }
32
isNotDef()33 bool SkSVGGradient::isNotDef() {
34 return false;
35 }
36
translate(SkSVGParser & parser,bool defState)37 void SkSVGGradient::translate(SkSVGParser& parser, bool defState) {
38 INHERITED::translate(parser, defState);
39 // !!! no support for 'objectBoundingBox' yet
40 bool first = true;
41 bool addedFirst = false;
42 bool addedLast = false;
43 SkString offsets("[");
44 SkString* lastOffset = NULL;
45 for (SkSVGElement** ptr = fChildren.begin(); ptr < fChildren.end(); ptr++) {
46 SkASSERT((*ptr)->getType() == SkSVGType_Stop);
47 SkSVGStop* stop = (SkSVGStop*) *ptr;
48 if (first && stop->f_offset.equals("0") == false) {
49 addedFirst = true;
50 offsets.append("0,");
51 }
52 SkString* thisOffset = &stop->f_offset;
53 if (lastOffset && thisOffset->equals(*lastOffset)) {
54 if (thisOffset->equals("1")) {
55 offsets.remove(offsets.size() - 2, 2);
56 offsets.append(".999,");
57 } else {
58 SkASSERT(0); // !!! need to write this case
59 }
60 }
61 offsets.append(*thisOffset);
62 if (ptr == fChildren.end() - 1) { // last
63 if (stop->f_offset.equals("1") == false) {
64 offsets.append(",1");
65 addedLast = true;
66 }
67 } else
68 offsets.appendUnichar(',');
69 first = false;
70 lastOffset = thisOffset;
71 }
72 offsets.appendUnichar(']');
73 parser._addAttribute("offsets", offsets);
74 if (addedFirst)
75 parser.translate(*fChildren.begin(), defState);
76 for (SkSVGElement** ptr = fChildren.begin(); ptr < fChildren.end(); ptr++)
77 parser.translate(*ptr, defState);
78 if (addedLast)
79 parser.translate(*(fChildren.end() - 1), defState);
80 }
81
translateGradientUnits(SkString & units)82 void SkSVGGradient::translateGradientUnits(SkString& units) {
83 // !!! no support for 'objectBoundingBox' yet
84 SkASSERT(strcmp(units.c_str(), "userSpaceOnUse") == 0);
85 }
86
write(SkSVGParser & parser,SkString & baseColor)87 void SkSVGGradient::write(SkSVGParser& parser, SkString& baseColor) {
88 if (baseColor.c_str()[0] != '#')
89 return;
90 SkSVGPaint* saveHead = parser.fHead;
91 parser.fHead = &fPaintState;
92 parser.fSuppressPaint = true;
93 SkString originalID(f_id);
94 f_id.set("mask"); // write out gradient named given name + color (less initial #)
95 f_id.append(baseColor.c_str() + 1);
96 SkString originalColors;
97 for (SkSVGElement** ptr = fChildren.begin(); ptr < fChildren.end(); ptr++) {
98 SkSVGStop* colorElement = (SkSVGStop*) *ptr;
99 SkString& color = colorElement->fPaintState.f_stopColor;
100 originalColors.append(color);
101 originalColors.appendUnichar(',');
102 SkASSERT(color.c_str()[0] == '#');
103 SkString replacement;
104 replacement.set("0x");
105 replacement.append(color.c_str() + 1, 2); // add stop colors using given color, turning existing stop color into alpha
106 SkASSERT(baseColor.c_str()[0] == '#');
107 SkASSERT(baseColor.size() == 7);
108 replacement.append(baseColor.c_str() + 1);
109 color.set(replacement);
110 }
111 translate(parser, true);
112 const char* originalPtr = originalColors.c_str(); // restore original gradient values
113 for (SkSVGElement** ptr = fChildren.begin(); ptr < fChildren.end(); ptr++) {
114 SkSVGStop* color = (SkSVGStop*) *ptr;
115 const char* originalEnd = strchr(originalPtr, ',');
116 color->fPaintState.f_stopColor.set(originalPtr, originalEnd - originalPtr);
117 originalPtr = originalEnd + 1;
118 }
119 f_id.set(originalID);
120 parser.fSuppressPaint = false;
121 parser.fHead = saveHead;
122 }
123
124