1 /*
2 * Copyright (C) 2011 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 #include "NinePatchPeeker.h"
18
19 #include <SkBitmap.h>
20 #include <cutils/compiler.h>
21
22 using namespace android;
23
readChunk(const char tag[],const void * data,size_t length)24 bool NinePatchPeeker::readChunk(const char tag[], const void* data, size_t length) {
25 if (!strcmp("npTc", tag) && length >= sizeof(Res_png_9patch)) {
26 Res_png_9patch* patch = (Res_png_9patch*) data;
27 size_t patchSize = patch->serializedSize();
28 if (length != patchSize) {
29 return false;
30 }
31 // You have to copy the data because it is owned by the png reader
32 Res_png_9patch* patchNew = (Res_png_9patch*) malloc(patchSize);
33 memcpy(patchNew, patch, patchSize);
34 Res_png_9patch::deserialize(patchNew);
35 patchNew->fileToDevice();
36 free(mPatch);
37 mPatch = patchNew;
38 mPatchSize = patchSize;
39 } else if (!strcmp("npLb", tag) && length == sizeof(int32_t) * 4) {
40 mHasInsets = true;
41 memcpy(&mOpticalInsets, data, sizeof(int32_t) * 4);
42 } else if (!strcmp("npOl", tag) && length == 24) { // 4 int32_ts, 1 float, 1 int32_t sized byte
43 mHasInsets = true;
44 memcpy(&mOutlineInsets, data, sizeof(int32_t) * 4);
45 mOutlineRadius = ((const float*)data)[4];
46 mOutlineAlpha = ((const int32_t*)data)[5] & 0xff;
47 }
48 return true; // keep on decoding
49 }
50
scaleDivRange(int32_t * divs,int count,float scale,int maxValue)51 static void scaleDivRange(int32_t* divs, int count, float scale, int maxValue) {
52 for (int i = 0; i < count; i++) {
53 divs[i] = int32_t(divs[i] * scale + 0.5f);
54 if (i > 0 && divs[i] == divs[i - 1]) {
55 divs[i]++; // avoid collisions
56 }
57 }
58
59 if (CC_UNLIKELY(divs[count - 1] > maxValue)) {
60 // if the collision avoidance above put some divs outside the bounds of the bitmap,
61 // slide outer stretchable divs inward to stay within bounds
62 int highestAvailable = maxValue;
63 for (int i = count - 1; i >= 0; i--) {
64 divs[i] = highestAvailable;
65 if (i > 0 && divs[i] <= divs[i-1]) {
66 // keep shifting
67 highestAvailable = divs[i] - 1;
68 } else {
69 break;
70 }
71 }
72 }
73 }
74
scale(float scaleX,float scaleY,int scaledWidth,int scaledHeight)75 void NinePatchPeeker::scale(float scaleX, float scaleY, int scaledWidth, int scaledHeight) {
76 if (!mPatch) {
77 return;
78 }
79
80 // The max value for the divRange is one pixel less than the actual max to ensure that the size
81 // of the last div is not zero. A div of size 0 is considered invalid input and will not render.
82 if (!SkScalarNearlyEqual(scaleX, 1.0f)) {
83 mPatch->paddingLeft = int(mPatch->paddingLeft * scaleX + 0.5f);
84 mPatch->paddingRight = int(mPatch->paddingRight * scaleX + 0.5f);
85 scaleDivRange(mPatch->getXDivs(), mPatch->numXDivs, scaleX, scaledWidth - 1);
86 }
87
88 if (!SkScalarNearlyEqual(scaleY, 1.0f)) {
89 mPatch->paddingTop = int(mPatch->paddingTop * scaleY + 0.5f);
90 mPatch->paddingBottom = int(mPatch->paddingBottom * scaleY + 0.5f);
91 scaleDivRange(mPatch->getYDivs(), mPatch->numYDivs, scaleY, scaledHeight - 1);
92 }
93 }
94