xref: /aosp_15_r20/frameworks/base/libs/hwui/NinePatchUtils.h (revision d57664e9bc4670b3ecf6748a746a57c557b6bc9e)
1*d57664e9SAndroid Build Coastguard Worker /*
2*d57664e9SAndroid Build Coastguard Worker  * Copyright (C) 2016 The Android Open Source Project
3*d57664e9SAndroid Build Coastguard Worker  *
4*d57664e9SAndroid Build Coastguard Worker  * Licensed under the Apache License, Version 2.0 (the "License");
5*d57664e9SAndroid Build Coastguard Worker  * you may not use this file except in compliance with the License.
6*d57664e9SAndroid Build Coastguard Worker  * You may obtain a copy of the License at
7*d57664e9SAndroid Build Coastguard Worker  *
8*d57664e9SAndroid Build Coastguard Worker  *      http://www.apache.org/licenses/LICENSE-2.0
9*d57664e9SAndroid Build Coastguard Worker  *
10*d57664e9SAndroid Build Coastguard Worker  * Unless required by applicable law or agreed to in writing, software
11*d57664e9SAndroid Build Coastguard Worker  * distributed under the License is distributed on an "AS IS" BASIS,
12*d57664e9SAndroid Build Coastguard Worker  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13*d57664e9SAndroid Build Coastguard Worker  * See the License for the specific language governing permissions and
14*d57664e9SAndroid Build Coastguard Worker  * limitations under the License.
15*d57664e9SAndroid Build Coastguard Worker  */
16*d57664e9SAndroid Build Coastguard Worker 
17*d57664e9SAndroid Build Coastguard Worker #pragma once
18*d57664e9SAndroid Build Coastguard Worker 
19*d57664e9SAndroid Build Coastguard Worker namespace android {
20*d57664e9SAndroid Build Coastguard Worker namespace NinePatchUtils {
21*d57664e9SAndroid Build Coastguard Worker 
SetLatticeDivs(SkCanvas::Lattice * lattice,const Res_png_9patch & chunk,int width,int height)22*d57664e9SAndroid Build Coastguard Worker static inline void SetLatticeDivs(SkCanvas::Lattice* lattice, const Res_png_9patch& chunk,
23*d57664e9SAndroid Build Coastguard Worker                                   int width, int height) {
24*d57664e9SAndroid Build Coastguard Worker     lattice->fXCount = chunk.numXDivs;
25*d57664e9SAndroid Build Coastguard Worker     lattice->fYCount = chunk.numYDivs;
26*d57664e9SAndroid Build Coastguard Worker     lattice->fXDivs = chunk.getXDivs();
27*d57664e9SAndroid Build Coastguard Worker     lattice->fYDivs = chunk.getYDivs();
28*d57664e9SAndroid Build Coastguard Worker 
29*d57664e9SAndroid Build Coastguard Worker     // We'll often see ninepatches where the last div is equal to the width or height.
30*d57664e9SAndroid Build Coastguard Worker     // This doesn't provide any additional information and is not supported by Skia.
31*d57664e9SAndroid Build Coastguard Worker     if (lattice->fXCount > 0 && width == lattice->fXDivs[lattice->fXCount - 1]) {
32*d57664e9SAndroid Build Coastguard Worker         lattice->fXCount--;
33*d57664e9SAndroid Build Coastguard Worker     }
34*d57664e9SAndroid Build Coastguard Worker     if (lattice->fYCount > 0 && height == lattice->fYDivs[lattice->fYCount - 1]) {
35*d57664e9SAndroid Build Coastguard Worker         lattice->fYCount--;
36*d57664e9SAndroid Build Coastguard Worker     }
37*d57664e9SAndroid Build Coastguard Worker }
38*d57664e9SAndroid Build Coastguard Worker 
NumDistinctRects(const SkCanvas::Lattice & lattice)39*d57664e9SAndroid Build Coastguard Worker static inline int NumDistinctRects(const SkCanvas::Lattice& lattice) {
40*d57664e9SAndroid Build Coastguard Worker     int xRects;
41*d57664e9SAndroid Build Coastguard Worker     if (lattice.fXCount > 0) {
42*d57664e9SAndroid Build Coastguard Worker         xRects = (0 == lattice.fXDivs[0]) ? lattice.fXCount : lattice.fXCount + 1;
43*d57664e9SAndroid Build Coastguard Worker     } else {
44*d57664e9SAndroid Build Coastguard Worker         xRects = 1;
45*d57664e9SAndroid Build Coastguard Worker     }
46*d57664e9SAndroid Build Coastguard Worker 
47*d57664e9SAndroid Build Coastguard Worker     int yRects;
48*d57664e9SAndroid Build Coastguard Worker     if (lattice.fYCount > 0) {
49*d57664e9SAndroid Build Coastguard Worker         yRects = (0 == lattice.fYDivs[0]) ? lattice.fYCount : lattice.fYCount + 1;
50*d57664e9SAndroid Build Coastguard Worker     } else {
51*d57664e9SAndroid Build Coastguard Worker         yRects = 1;
52*d57664e9SAndroid Build Coastguard Worker     }
53*d57664e9SAndroid Build Coastguard Worker     return xRects * yRects;
54*d57664e9SAndroid Build Coastguard Worker }
55*d57664e9SAndroid Build Coastguard Worker 
SetLatticeFlags(SkCanvas::Lattice * lattice,SkCanvas::Lattice::RectType * flags,int numFlags,const Res_png_9patch & chunk,SkColor * colors)56*d57664e9SAndroid Build Coastguard Worker static inline void SetLatticeFlags(SkCanvas::Lattice* lattice, SkCanvas::Lattice::RectType* flags,
57*d57664e9SAndroid Build Coastguard Worker                                    int numFlags, const Res_png_9patch& chunk, SkColor* colors) {
58*d57664e9SAndroid Build Coastguard Worker     lattice->fRectTypes = flags;
59*d57664e9SAndroid Build Coastguard Worker     lattice->fColors = colors;
60*d57664e9SAndroid Build Coastguard Worker     sk_bzero(flags, numFlags * sizeof(SkCanvas::Lattice::RectType));
61*d57664e9SAndroid Build Coastguard Worker     sk_bzero(colors, numFlags * sizeof(SkColor));
62*d57664e9SAndroid Build Coastguard Worker 
63*d57664e9SAndroid Build Coastguard Worker     bool needPadRow = lattice->fYCount > 0 && 0 == lattice->fYDivs[0];
64*d57664e9SAndroid Build Coastguard Worker     bool needPadCol = lattice->fXCount > 0 && 0 == lattice->fXDivs[0];
65*d57664e9SAndroid Build Coastguard Worker 
66*d57664e9SAndroid Build Coastguard Worker     int yCount = lattice->fYCount;
67*d57664e9SAndroid Build Coastguard Worker     if (needPadRow) {
68*d57664e9SAndroid Build Coastguard Worker         // Skip flags for the degenerate first row of rects.
69*d57664e9SAndroid Build Coastguard Worker         flags += lattice->fXCount + 1;
70*d57664e9SAndroid Build Coastguard Worker         colors += lattice->fXCount + 1;
71*d57664e9SAndroid Build Coastguard Worker         yCount--;
72*d57664e9SAndroid Build Coastguard Worker     }
73*d57664e9SAndroid Build Coastguard Worker 
74*d57664e9SAndroid Build Coastguard Worker     int i = 0;
75*d57664e9SAndroid Build Coastguard Worker     bool setFlags = false;
76*d57664e9SAndroid Build Coastguard Worker     for (int y = 0; y < yCount + 1; y++) {
77*d57664e9SAndroid Build Coastguard Worker         for (int x = 0; x < lattice->fXCount + 1; x++) {
78*d57664e9SAndroid Build Coastguard Worker             if (0 == x && needPadCol) {
79*d57664e9SAndroid Build Coastguard Worker                 // First rect of each column is degenerate, skip the flag.
80*d57664e9SAndroid Build Coastguard Worker                 flags++;
81*d57664e9SAndroid Build Coastguard Worker                 colors++;
82*d57664e9SAndroid Build Coastguard Worker                 continue;
83*d57664e9SAndroid Build Coastguard Worker             }
84*d57664e9SAndroid Build Coastguard Worker 
85*d57664e9SAndroid Build Coastguard Worker             uint32_t currentColor = chunk.getColors()[i++];
86*d57664e9SAndroid Build Coastguard Worker             if (Res_png_9patch::TRANSPARENT_COLOR == currentColor) {
87*d57664e9SAndroid Build Coastguard Worker                 *flags = SkCanvas::Lattice::kTransparent;
88*d57664e9SAndroid Build Coastguard Worker                 setFlags = true;
89*d57664e9SAndroid Build Coastguard Worker             } else if (Res_png_9patch::NO_COLOR != currentColor) {
90*d57664e9SAndroid Build Coastguard Worker                 *flags = SkCanvas::Lattice::kFixedColor;
91*d57664e9SAndroid Build Coastguard Worker                 *colors = currentColor;
92*d57664e9SAndroid Build Coastguard Worker                 setFlags = true;
93*d57664e9SAndroid Build Coastguard Worker             }
94*d57664e9SAndroid Build Coastguard Worker 
95*d57664e9SAndroid Build Coastguard Worker             flags++;
96*d57664e9SAndroid Build Coastguard Worker             colors++;
97*d57664e9SAndroid Build Coastguard Worker         }
98*d57664e9SAndroid Build Coastguard Worker     }
99*d57664e9SAndroid Build Coastguard Worker 
100*d57664e9SAndroid Build Coastguard Worker     if (!setFlags) {
101*d57664e9SAndroid Build Coastguard Worker         lattice->fRectTypes = nullptr;
102*d57664e9SAndroid Build Coastguard Worker         lattice->fColors = nullptr;
103*d57664e9SAndroid Build Coastguard Worker     }
104*d57664e9SAndroid Build Coastguard Worker }
105*d57664e9SAndroid Build Coastguard Worker 
106*d57664e9SAndroid Build Coastguard Worker }  // namespace NinePatchUtils
107*d57664e9SAndroid Build Coastguard Worker }  // namespace android
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