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      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 "config.h"
     18 
     19 #include "RenderSkinNinePatch.h"
     20 #include "NinePatchPeeker.h"
     21 #include "SkCanvas.h"
     22 #include "SkImageDecoder.h"
     23 #include "SkNinePatch.h"
     24 #include "SkRect.h"
     25 #include "SkStream.h"
     26 #include "SkTemplates.h"
     27 #include <utils/Asset.h>
     28 #include <utils/AssetManager.h>
     29 #include <utils/Log.h>
     30 #include <utils/ResourceTypes.h>
     31 
     32 class SkPaint;
     33 class SkRegion;
     34 
     35 using namespace android;
     36 
     37 extern void NinePatch_Draw(SkCanvas* canvas, const SkRect& bounds,
     38         const SkBitmap& bitmap, const Res_png_9patch& chunk,
     39         const SkPaint* paint, SkRegion** outRegion);
     40 
     41 bool RenderSkinNinePatch::decodeAsset(AssetManager* am, const char* filename, NinePatch* ninepatch) {
     42     Asset* asset = am->open(filename, android::Asset::ACCESS_BUFFER);
     43     if (!asset) {
     44         asset = am->openNonAsset(filename, android::Asset::ACCESS_BUFFER);
     45         if (!asset) {
     46             return false;
     47         }
     48     }
     49 
     50     SkImageDecoder::Mode mode = SkImageDecoder::kDecodePixels_Mode;
     51     SkBitmap::Config prefConfig = SkBitmap::kNo_Config;
     52     SkMemoryStream stream(asset->getBuffer(false), asset->getLength());
     53     SkImageDecoder* decoder = SkImageDecoder::Factory(&stream);
     54     if (!decoder) {
     55         asset->close();
     56         LOGE("RenderSkinNinePatch::Failed to create an image decoder");
     57         return false;
     58     }
     59 
     60     decoder->setSampleSize(1);
     61     decoder->setDitherImage(true);
     62     decoder->setPreferQualityOverSpeed(false);
     63 
     64     NinePatchPeeker peeker(decoder);
     65 
     66     SkAutoTDelete<SkImageDecoder> add(decoder);
     67 
     68     decoder->setPeeker(&peeker);
     69     if (!decoder->decode(&stream, &ninepatch->m_bitmap, prefConfig, mode, true)) {
     70         asset->close();
     71         LOGE("RenderSkinNinePatch::Failed to decode nine patch asset");
     72         return false;
     73     }
     74 
     75     asset->close();
     76     if (!peeker.fPatchIsValid) {
     77         LOGE("RenderSkinNinePatch::Patch data not valid");
     78         return false;
     79     }
     80     void** data = &ninepatch->m_serializedPatchData;
     81     *data = malloc(peeker.fPatch->serializedSize());
     82     peeker.fPatch->serialize(*data);
     83     return true;
     84 }
     85 
     86 void RenderSkinNinePatch::DrawNinePatch(SkCanvas* canvas, const SkRect& bounds,
     87                                         const NinePatch& patch) {
     88     Res_png_9patch* data = Res_png_9patch::deserialize(patch.m_serializedPatchData);
     89 
     90     // if the NinePatch is bigger than the destination on a given axis the default
     91     // decoder will not stretch properly, therefore we fall back to skia's decoder
     92     // which if needed will down-sample and draw the bitmap as best as possible.
     93     if (patch.m_bitmap.width() >= bounds.width() || patch.m_bitmap.height() >= bounds.height()) {
     94 
     95         SkPaint defaultPaint;
     96         // matches default dither in NinePatchDrawable.java.
     97         defaultPaint.setDither(true);
     98         SkNinePatch::DrawMesh(canvas, bounds, patch.m_bitmap,
     99                               data->xDivs, data->numXDivs,
    100                               data->yDivs, data->numYDivs,
    101                               &defaultPaint);
    102     } else {
    103         NinePatch_Draw(canvas, bounds, patch.m_bitmap, *data, 0, 0);
    104     }
    105 }
    106