NinePatchPeeker.cpp revision 77b5cad3efedd20f2b7cc14d87ccce1b0261960a 
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
21using namespace android;
22
23bool NinePatchPeeker::peek(const char tag[], const void* data, size_t length) {
24    if (!strcmp("npTc", tag) && length >= sizeof(Res_png_9patch)) {
25        Res_png_9patch* patch = (Res_png_9patch*) data;
26        size_t patchSize = patch->serializedSize();
27        assert(length == patchSize);
28        // You have to copy the data because it is owned by the png reader
29        Res_png_9patch* patchNew = (Res_png_9patch*) malloc(patchSize);
30        memcpy(patchNew, patch, patchSize);
31        Res_png_9patch::deserialize(patchNew);
32        patchNew->fileToDevice();
33        free(mPatch);
34        mPatch = patchNew;
35        mPatchSize = patchSize;
36
37        // now update our host to force index or 32bit config
38        // 'cause we don't want 565 predithered, since as a 9patch, we know
39        // we will be stretched, and therefore we want to dither afterwards.
40        SkImageDecoder::PrefConfigTable table;
41        table.fPrefFor_8Index_NoAlpha_src   = SkBitmap::kIndex8_Config;
42        table.fPrefFor_8Index_YesAlpha_src  = SkBitmap::kIndex8_Config;
43        table.fPrefFor_8Gray_src            = SkBitmap::kARGB_8888_Config;
44        table.fPrefFor_8bpc_NoAlpha_src     = SkBitmap::kARGB_8888_Config;
45        table.fPrefFor_8bpc_YesAlpha_src    = SkBitmap::kARGB_8888_Config;
46
47        mHost->setPrefConfigTable(table);
48    } else if (!strcmp("npLb", tag) && length == sizeof(int32_t) * 4) {
49        mHasInsets = true;
50        memcpy(&mOpticalInsets, data, sizeof(int32_t) * 4);
51    } else if (!strcmp("npOl", tag) && length == 24) { // 4 int32_ts, 1 float, 1 int32_t sized byte
52        mHasInsets = true;
53        memcpy(&mOutlineInsets, data, sizeof(int32_t) * 4);
54        mOutlineRadius = ((const float*)data)[4];
55        mOutlineAlpha = ((const int32_t*)data)[5] & 0xff;
56    }
57    return true;    // keep on decoding
58}
59