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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 "SkBmpMaskCodec.h"
#include "SkCodecPriv.h"
#include "SkColorData.h"
/*
* Creates an instance of the decoder
*/
SkBmpMaskCodec::SkBmpMaskCodec(int width, int height, const SkEncodedInfo& info,
std::unique_ptr<SkStream> stream,
uint16_t bitsPerPixel, SkMasks* masks,
SkCodec::SkScanlineOrder rowOrder)
: INHERITED(width, height, info, std::move(stream), bitsPerPixel, rowOrder)
, fMasks(masks)
, fMaskSwizzler(nullptr)
{}
/*
* Initiates the bitmap decode
*/
SkCodec::Result SkBmpMaskCodec::onGetPixels(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts,
int* rowsDecoded) {
if (opts.fSubset) {
// Subsets are not supported.
return kUnimplemented;
}
if (dstInfo.dimensions() != this->getInfo().dimensions()) {
SkCodecPrintf("Error: scaling not supported.\n");
return kInvalidScale;
}
Result result = this->prepareToDecode(dstInfo, opts);
if (kSuccess != result) {
return result;
}
int rows = this->decodeRows(dstInfo, dst, dstRowBytes, opts);
if (rows != dstInfo.height()) {
*rowsDecoded = rows;
return kIncompleteInput;
}
return kSuccess;
}
SkCodec::Result SkBmpMaskCodec::onPrepareToDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options) {
if (this->colorXform()) {
this->resetXformBuffer(dstInfo.width());
}
SkImageInfo swizzlerInfo = dstInfo;
if (this->colorXform()) {
swizzlerInfo = swizzlerInfo.makeColorType(kXformSrcColorType);
if (kPremul_SkAlphaType == dstInfo.alphaType()) {
swizzlerInfo = swizzlerInfo.makeAlphaType(kUnpremul_SkAlphaType);
}
}
// Initialize the mask swizzler
fMaskSwizzler.reset(SkMaskSwizzler::CreateMaskSwizzler(swizzlerInfo, this->getInfo(),
fMasks.get(), this->bitsPerPixel(), options));
SkASSERT(fMaskSwizzler);
return SkCodec::kSuccess;
}
/*
* Performs the decoding
*/
int SkBmpMaskCodec::decodeRows(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts) {
// Iterate over rows of the image
uint8_t* srcRow = this->srcBuffer();
const int height = dstInfo.height();
for (int y = 0; y < height; y++) {
// Read a row of the input
if (this->stream()->read(srcRow, this->srcRowBytes()) != this->srcRowBytes()) {
SkCodecPrintf("Warning: incomplete input stream.\n");
return y;
}
// Decode the row in destination format
uint32_t row = this->getDstRow(y, height);
void* dstRow = SkTAddOffset<void>(dst, row * dstRowBytes);
if (this->colorXform()) {
fMaskSwizzler->swizzle(this->xformBuffer(), srcRow);
this->applyColorXform(dstRow, this->xformBuffer(), fMaskSwizzler->swizzleWidth());
} else {
fMaskSwizzler->swizzle(dstRow, srcRow);
}
}
// Finished decoding the entire image
return height;
}
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