Move SkBitmapRegionDecoder to include/android and src/android

tools/android/SkBitmapRegionCodec.cpp

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkAndroidCodec.h"
-#include "SkBitmapRegionCodec.h"
-#include "SkBitmapRegionDecoderPriv.h"
-#include "SkCodecPriv.h"
-#include "SkPixelRef.h"
-
-SkBitmapRegionCodec::SkBitmapRegionCodec(SkAndroidCodec* codec)
-    : INHERITED(codec->getInfo().width(), codec->getInfo().height())
-    , fCodec(codec)
-{}
-
-bool SkBitmapRegionCodec::decodeRegion(SkBitmap* bitmap, SkBRDAllocator* allocator,
-        const SkIRect& desiredSubset, int sampleSize, SkColorType dstColorType,
-        bool requireUnpremul) {
-
-    // Fix the input sampleSize if necessary.
-    if (sampleSize < 1) {
-        sampleSize = 1;
-    }
-
-    // The size of the output bitmap is determined by the size of the
-    // requested subset, not by the size of the intersection of the subset
-    // and the image dimensions.
-    // If inputX is negative, we will need to place decoded pixels into the
-    // output bitmap starting at a left offset.  Call this outX.
-    // If outX is non-zero, subsetX must be zero.
-    // If inputY is negative, we will need to place decoded pixels into the
-    // output bitmap starting at a top offset.  Call this outY.
-    // If outY is non-zero, subsetY must be zero.
-    int outX;
-    int outY;
-    SkIRect subset = desiredSubset;
-    SubsetType type = adjust_subset_rect(fCodec->getInfo().dimensions(), &subset, &outX, &outY);
-    if (SubsetType::kOutside_SubsetType == type) {
-        return false;
-    }
-
-    // Ask the codec for a scaled subset
-    if (!fCodec->getSupportedSubset(&subset)) {
-        SkCodecPrintf("Error: Could not get subset.\n");
-        return false;
-    }
-    SkISize scaledSize = fCodec->getSampledSubsetDimensions(sampleSize, subset);
-
-    // Create the image info for the decode
-    SkAlphaType dstAlphaType = fCodec->getInfo().alphaType();
-    if (kOpaque_SkAlphaType != dstAlphaType) {
-        dstAlphaType = requireUnpremul ? kUnpremul_SkAlphaType : kPremul_SkAlphaType;
-    }
-    SkImageInfo decodeInfo = SkImageInfo::Make(scaledSize.width(), scaledSize.height(),
-            dstColorType, dstAlphaType);
-
-    // Construct a color table for the decode if necessary
-    SkAutoTUnref<SkColorTable> colorTable(nullptr);
-    SkPMColor* colorPtr = nullptr;
-    int* colorCountPtr = nullptr;
-    int maxColors = 256;
-    SkPMColor colors[256];
-    if (kIndex_8_SkColorType == dstColorType) {
-        // TODO (msarett): This performs a copy that is unnecessary since
-        //                 we have not yet initialized the color table.
-        //                 And then we need to use a const cast to get
-        //                 a pointer to the color table that we can
-        //                 modify during the decode.  We could alternatively
-        //                 perform the decode before creating the bitmap and
-        //                 the color table.  We still would need to copy the
-        //                 colors into the color table after the decode.
-        colorTable.reset(new SkColorTable(colors, maxColors));
-        colorPtr = const_cast<SkPMColor*>(colorTable->readColors());
-        colorCountPtr = &maxColors;
-    }
-
-    // Initialize the destination bitmap
-    int scaledOutX = 0;
-    int scaledOutY = 0;
-    int scaledOutWidth = scaledSize.width();
-    int scaledOutHeight = scaledSize.height();
-    if (SubsetType::kPartiallyInside_SubsetType == type) {
-        scaledOutX = outX / sampleSize;
-        scaledOutY = outY / sampleSize;
-        // We need to be safe here because getSupportedSubset() may have modified the subset.
-        const int extraX = SkTMax(0, desiredSubset.width() - outX - subset.width());
-        const int extraY = SkTMax(0, desiredSubset.height() - outY - subset.height());
-        const int scaledExtraX = extraX / sampleSize;
-        const int scaledExtraY = extraY / sampleSize;
-        scaledOutWidth += scaledOutX + scaledExtraX;
-        scaledOutHeight += scaledOutY + scaledExtraY;
-    }
-    SkImageInfo outInfo = decodeInfo.makeWH(scaledOutWidth, scaledOutHeight);
-    bitmap->setInfo(outInfo);
-    if (!bitmap->tryAllocPixels(allocator, colorTable.get())) {
-        SkCodecPrintf("Error: Could not allocate pixels.\n");
-        return false;
-    }
-
-    // Zero the bitmap if the region is not completely within the image.
-    // TODO (msarett): Can we make this faster by implementing it to only
-    //                 zero parts of the image that we won't overwrite with
-    //                 pixels?
-    SkCodec::ZeroInitialized zeroInit = allocator ? allocator->zeroInit() :
-            SkCodec::kNo_ZeroInitialized;
-    if (SubsetType::kPartiallyInside_SubsetType == type &&
-            SkCodec::kNo_ZeroInitialized == zeroInit) {
-        void* pixels = bitmap->getPixels();
-        size_t bytes = outInfo.getSafeSize(bitmap->rowBytes());
-        memset(pixels, 0, bytes);
-    }
-
-    // Decode into the destination bitmap
-    SkAndroidCodec::AndroidOptions options;
-    options.fSampleSize = sampleSize;
-    options.fSubset = &subset;
-    options.fColorPtr = colorPtr;
-    options.fColorCount = colorCountPtr;
-    options.fZeroInitialized = zeroInit;
-    void* dst = bitmap->getAddr(scaledOutX, scaledOutY);
-
-    // FIXME: skbug.com/4538
-    // It is important that we use the rowBytes on the pixelRef.  They may not be
-    // set properly on the bitmap.
-    SkPixelRef* pr = SkRef(bitmap->pixelRef());
-    size_t rowBytes = pr->rowBytes();
-    bitmap->setInfo(outInfo, rowBytes);
-    bitmap->setPixelRef(pr)->unref();
-    SkCodec::Result result = fCodec->getAndroidPixels(decodeInfo, dst, rowBytes, &options);
-    if (SkCodec::kSuccess != result && SkCodec::kIncompleteInput != result) {
-        SkCodecPrintf("Error: Could not get pixels.\n");
-        return false;
-    }
-
-    return true;
-}
-
-bool SkBitmapRegionCodec::conversionSupported(SkColorType colorType) {
-    // FIXME: Call virtual function when it lands.
-    SkImageInfo info = SkImageInfo::Make(0, 0, colorType, fCodec->getInfo().alphaType(),
-            fCodec->getInfo().profileType());
-    return conversion_possible(info, fCodec->getInfo());
-}