Home | History | Annotate | Download | only in codec 
      1 /*
      2  * Copyright 2015 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkCodecImageGenerator.h"
      9 
     10 SkImageGenerator* SkCodecImageGenerator::NewFromEncodedCodec(SkData* data) {
     11     SkCodec* codec = SkCodec::NewFromData(data);
     12     if (nullptr == codec) {
     13         return nullptr;
     14     }
     15 
     16     return new SkCodecImageGenerator(codec, data);
     17 }
     18 
     19 static SkImageInfo make_premul(const SkImageInfo& info) {
     20     if (kUnpremul_SkAlphaType == info.alphaType()) {
     21         return info.makeAlphaType(kPremul_SkAlphaType);
     22     }
     23 
     24     return info;
     25 }
     26 
     27 SkCodecImageGenerator::SkCodecImageGenerator(SkCodec* codec, SkData* data)
     28     : INHERITED(make_premul(codec->getInfo()))
     29     , fCodec(codec)
     30     , fData(SkRef(data))
     31     , fYWidth(0)
     32     , fUWidth(0)
     33     , fVWidth(0)
     34 {}
     35 
     36 SkData* SkCodecImageGenerator::onRefEncodedData(SK_REFENCODEDDATA_CTXPARAM) {
     37     return SkRef(fData.get());
     38 }
     39 
     40 bool SkCodecImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
     41         SkPMColor ctable[], int* ctableCount) {
     42 
     43     SkCodec::Result result = fCodec->getPixels(info, pixels, rowBytes, nullptr, ctable,
     44             ctableCount);
     45     switch (result) {
     46         case SkCodec::kSuccess:
     47         case SkCodec::kIncompleteInput:
     48             return true;
     49         default:
     50             return false;
     51     }
     52 }
     53 
     54 bool SkCodecImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
     55         SkYUVColorSpace* colorSpace) {
     56     // TODO (msarett): Change the YUV API in ImageGenerator to match SkCodec.
     57     //                 This function is currently a hack to match the implementation
     58     //                 in SkCodec with the old API.
     59     SkCodec::YUVSizeInfo sizeInfo;
     60 
     61     // If planes is NULL, we just need to return the size.
     62     if (nullptr == planes) {
     63         bool result = fCodec->queryYUV8(&sizeInfo, colorSpace);
     64         if (result) {
     65             // Save the true widths
     66             fYWidth = sizeInfo.fYSize.width();
     67             fUWidth = sizeInfo.fUSize.width();
     68             fVWidth = sizeInfo.fVSize.width();
     69 
     70             // Set the sizes so that the client allocates enough memory
     71             sizes[0].fWidth = (int) sizeInfo.fYWidthBytes;
     72             sizes[0].fHeight = sizeInfo.fYSize.height();
     73             sizes[1].fWidth = (int) sizeInfo.fUWidthBytes;
     74             sizes[1].fHeight = sizeInfo.fUSize.height();
     75             sizes[2].fWidth = (int) sizeInfo.fVWidthBytes;
     76             sizes[2].fHeight = sizeInfo.fVSize.height();
     77         }
     78         return result;
     79     }
     80 
     81     // Set the sizeInfo with the true widths and heights
     82     SkASSERT(fYWidth != 0 && fUWidth != 0 && fVWidth != 0);
     83     sizeInfo.fYSize.set(fYWidth, sizes[0].height());
     84     sizeInfo.fUSize.set(fUWidth, sizes[1].height());
     85     sizeInfo.fVSize.set(fVWidth, sizes[2].height());
     86 
     87     // Set the sizeInfo with the allocated widths
     88     sizeInfo.fYWidthBytes = sizes[0].width();
     89     sizeInfo.fUWidthBytes = sizes[1].width();
     90     sizeInfo.fVWidthBytes = sizes[2].width();
     91     SkCodec::Result result = fCodec->getYUV8Planes(sizeInfo, planes);
     92     if ((result == SkCodec::kSuccess || result == SkCodec::kIncompleteInput) && colorSpace) {
     93         *colorSpace = kJPEG_SkYUVColorSpace;
     94     }
     95 
     96     switch (result) {
     97         case SkCodec::kSuccess:
     98         case SkCodec::kIncompleteInput:
     99             return true;
    100         default:
    101             return false;
    102     }
    103 }
    104