NinePatchPeeker.cpp revision f8d8777dddf91c741981b4f795f2fb2b1d81c1b6 
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) == 0 && 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        // this relies on deserialization being done in place
32        Res_png_9patch::deserialize(patchNew);
33        patchNew->fileToDevice();
34        free(fPatch);
35        fPatch = patchNew;
36        //printf("9patch: (%d,%d)-(%d,%d)\n",
37        //       fPatch.sizeLeft, fPatch.sizeTop,
38        //       fPatch.sizeRight, fPatch.sizeBottom);
39
40        // now update our host to force index or 32bit config
41        // 'cause we don't want 565 predithered, since as a 9patch, we know
42        // we will be stretched, and therefore we want to dither afterwards.
43        SkImageDecoder::PrefConfigTable table;
44        table.fPrefFor_8Index_NoAlpha_src   = SkBitmap::kIndex8_Config;
45        table.fPrefFor_8Index_YesAlpha_src  = SkBitmap::kIndex8_Config;
46        table.fPrefFor_8Gray_src            = SkBitmap::kARGB_8888_Config;
47        table.fPrefFor_8bpc_NoAlpha_src     = SkBitmap::kARGB_8888_Config;
48        table.fPrefFor_8bpc_YesAlpha_src    = SkBitmap::kARGB_8888_Config;
49
50        fHost->setPrefConfigTable(table);
51    } else if (strcmp("npLb", tag) == 0 && length == sizeof(int) * 4) {
52        fLayoutBounds = new int[4];
53        memcpy(fLayoutBounds, data, sizeof(int) * 4);
54    }
55    return true;    // keep on decoding
56}
57