1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 namespace android {
20 namespace NinePatchUtils {
21
SetLatticeDivs(SkCanvas::Lattice * lattice,const Res_png_9patch & chunk,int width,int height)22 static inline void SetLatticeDivs(SkCanvas::Lattice* lattice, const Res_png_9patch& chunk,
23 int width, int height) {
24 lattice->fXCount = chunk.numXDivs;
25 lattice->fYCount = chunk.numYDivs;
26 lattice->fXDivs = chunk.getXDivs();
27 lattice->fYDivs = chunk.getYDivs();
28
29 // We'll often see ninepatches where the last div is equal to the width or height.
30 // This doesn't provide any additional information and is not supported by Skia.
31 if (lattice->fXCount > 0 && width == lattice->fXDivs[lattice->fXCount - 1]) {
32 lattice->fXCount--;
33 }
34 if (lattice->fYCount > 0 && height == lattice->fYDivs[lattice->fYCount - 1]) {
35 lattice->fYCount--;
36 }
37 }
38
NumDistinctRects(const SkCanvas::Lattice & lattice)39 static inline int NumDistinctRects(const SkCanvas::Lattice& lattice) {
40 int xRects;
41 if (lattice.fXCount > 0) {
42 xRects = (0 == lattice.fXDivs[0]) ? lattice.fXCount : lattice.fXCount + 1;
43 } else {
44 xRects = 1;
45 }
46
47 int yRects;
48 if (lattice.fYCount > 0) {
49 yRects = (0 == lattice.fYDivs[0]) ? lattice.fYCount : lattice.fYCount + 1;
50 } else {
51 yRects = 1;
52 }
53 return xRects * yRects;
54 }
55
SetLatticeFlags(SkCanvas::Lattice * lattice,SkCanvas::Lattice::RectType * flags,int numFlags,const Res_png_9patch & chunk,SkColor * colors)56 static inline void SetLatticeFlags(SkCanvas::Lattice* lattice,
57 SkCanvas::Lattice::RectType* flags, int numFlags, const Res_png_9patch& chunk,
58 SkColor* colors) {
59 lattice->fRectTypes = flags;
60 lattice->fColors = colors;
61 sk_bzero(flags, numFlags * sizeof(SkCanvas::Lattice::RectType));
62 sk_bzero(colors, numFlags * sizeof(SkColor));
63
64 bool needPadRow = lattice->fYCount > 0 && 0 == lattice->fYDivs[0];
65 bool needPadCol = lattice->fXCount > 0 && 0 == lattice->fXDivs[0];
66
67 int yCount = lattice->fYCount;
68 if (needPadRow) {
69 // Skip flags for the degenerate first row of rects.
70 flags += lattice->fXCount + 1;
71 colors += lattice->fXCount + 1;
72 yCount--;
73 }
74
75 int i = 0;
76 bool setFlags = false;
77 for (int y = 0; y < yCount + 1; y++) {
78 for (int x = 0; x < lattice->fXCount + 1; x++) {
79 if (0 == x && needPadCol) {
80 // First rect of each column is degenerate, skip the flag.
81 flags++;
82 colors++;
83 continue;
84 }
85
86 uint32_t currentColor = chunk.getColors()[i++];
87 if (Res_png_9patch::TRANSPARENT_COLOR == currentColor) {
88 *flags = SkCanvas::Lattice::kTransparent;
89 setFlags = true;
90 } else if (Res_png_9patch::NO_COLOR != currentColor) {
91 *flags = SkCanvas::Lattice::kFixedColor;
92 *colors = currentColor;
93 setFlags = true;
94 }
95
96 flags++;
97 colors++;
98 }
99 }
100
101 if (!setFlags) {
102 lattice->fRectTypes = nullptr;
103 lattice->fColors = nullptr;
104 }
105 }
106
107 }; // namespace NinePatchUtils
108 }; // namespace android
109