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- /*
- * 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 "include/codec/SkAndroidCodec.h"
- #include "src/android/SkBitmapRegionCodec.h"
- #include "src/android/SkBitmapRegionDecoderPriv.h"
- #include "src/codec/SkCodecPriv.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, sk_sp<SkColorSpace> dstColorSpace) {
- // 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->computeOutputAlphaType(requireUnpremul);
- SkImageInfo decodeInfo = SkImageInfo::Make(scaledSize.width(), scaledSize.height(),
- dstColorType, dstAlphaType, dstColorSpace);
- // 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);
- if (kGray_8_SkColorType == dstColorType) {
- // The legacy implementations of BitmapFactory and BitmapRegionDecoder
- // used kAlpha8 for grayscale images (before kGray8 existed). While
- // the codec recognizes kGray8, we need to decode into a kAlpha8
- // bitmap in order to avoid a behavior change.
- outInfo = outInfo.makeColorType(kAlpha_8_SkColorType).makeAlphaType(kPremul_SkAlphaType);
- }
- bitmap->setInfo(outInfo);
- if (!bitmap->tryAllocPixels(allocator)) {
- 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.computeByteSize(bitmap->rowBytes());
- memset(pixels, 0, bytes);
- }
- // Decode into the destination bitmap
- SkAndroidCodec::AndroidOptions options;
- options.fSampleSize = sampleSize;
- options.fSubset = ⊂
- options.fZeroInitialized = zeroInit;
- void* dst = bitmap->getAddr(scaledOutX, scaledOutY);
- SkCodec::Result result = fCodec->getAndroidPixels(decodeInfo, dst, bitmap->rowBytes(),
- &options);
- switch (result) {
- case SkCodec::kSuccess:
- case SkCodec::kIncompleteInput:
- case SkCodec::kErrorInInput:
- return true;
- default:
- SkCodecPrintf("Error: Could not get pixels with message \"%s\".\n",
- SkCodec::ResultToString(result));
- return false;
- }
- }
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