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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 "SkColorPriv.h"
/*
* Creates an instance of the decoder
*/
SkBmpMaskCodec::SkBmpMaskCodec(const SkImageInfo& info, SkStream* stream,
uint16_t bitsPerPixel, SkMasks* masks,
SkCodec::SkScanlineOrder rowOrder)
: INHERITED(info, stream, bitsPerPixel, rowOrder)
, fMasks(masks)
, fMaskSwizzler(nullptr)
, fSrcRowBytes(SkAlign4(compute_row_bytes(this->getInfo().width(), this->bitsPerPixel())))
, fSrcBuffer(new uint8_t [fSrcRowBytes])
{}
/*
* Initiates the bitmap decode
*/
SkCodec::Result SkBmpMaskCodec::onGetPixels(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts,
SkPMColor* inputColorPtr,
int* inputColorCount) {
if (!this->rewindIfNeeded()) {
return kCouldNotRewind;
}
if (opts.fSubset) {
// Subsets are not supported.
return kUnimplemented;
}
if (dstInfo.dimensions() != this->getInfo().dimensions()) {
SkCodecPrintf("Error: scaling not supported.\n");
return kInvalidScale;
}
if (!conversion_possible(dstInfo, this->getInfo())) {
SkCodecPrintf("Error: cannot convert input type to output type.\n");
return kInvalidConversion;
}
Result result = this->prepareToDecode(dstInfo, opts, inputColorPtr, inputColorCount);
if (kSuccess != result) {
return result;
}
return this->decodeRows(dstInfo, dst, dstRowBytes, opts);
}
bool SkBmpMaskCodec::initializeSwizzler(const SkImageInfo& dstInfo) {
// Create the swizzler
fMaskSwizzler.reset(SkMaskSwizzler::CreateMaskSwizzler(
dstInfo, this->getInfo(), fMasks, this->bitsPerPixel()));
if (nullptr == fMaskSwizzler.get()) {
return false;
}
return true;
}
SkCodec::Result SkBmpMaskCodec::prepareToDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options, SkPMColor inputColorPtr[], int* inputColorCount) {
// Initialize a the mask swizzler
if (!this->initializeSwizzler(dstInfo)) {
SkCodecPrintf("Error: cannot initialize swizzler.\n");
return SkCodec::kInvalidConversion;
}
return SkCodec::kSuccess;
}
/*
* Performs the decoding
*/
SkCodec::Result SkBmpMaskCodec::decodeRows(const SkImageInfo& dstInfo,
void* dst, size_t dstRowBytes,
const Options& opts) {
// Iterate over rows of the image
uint8_t* srcRow = fSrcBuffer.get();
const int height = dstInfo.height();
for (int y = 0; y < height; y++) {
// Read a row of the input
if (this->stream()->read(srcRow, fSrcRowBytes) != fSrcRowBytes) {
SkCodecPrintf("Warning: incomplete input stream.\n");
// Fill the destination image on failure
void* dstStart = this->getDstStartRow(dst, dstRowBytes, y);
uint32_t fillColor = get_fill_color_or_index(dstInfo.alphaType());
SkSwizzler::Fill(dstStart, dstInfo, dstRowBytes, height - y,
fillColor, nullptr, opts.fZeroInitialized);
return kIncompleteInput;
}
// Decode the row in destination format
uint32_t row = this->getDstRow(y, height);
void* dstRow = SkTAddOffset<void>(dst, row * dstRowBytes);
fMaskSwizzler->swizzle(dstRow, srcRow);
}
// Finished decoding the entire image
return kSuccess;
}
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