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Unified Diff: src/codec/SkCodec_wbmp.cpp

Issue 1567863003: Rename SkGifCodec, SkIcoCodec, SkWbmpCodec (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 4 years, 11 months ago
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Index: src/codec/SkCodec_wbmp.cpp
diff --git a/src/codec/SkCodec_wbmp.cpp b/src/codec/SkCodec_wbmp.cpp
deleted file mode 100644
index d734ad3a624e7cc3a1e50816b98d587bafc03615..0000000000000000000000000000000000000000
--- a/src/codec/SkCodec_wbmp.cpp
+++ /dev/null
@@ -1,212 +0,0 @@
-/*
- * 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 "SkCodec.h"
-#include "SkCodecPriv.h"
-#include "SkColorPriv.h"
-#include "SkColorTable.h"
-#include "SkData.h"
-#include "SkStream.h"
-#include "SkCodec_wbmp.h"
-
-// Each bit represents a pixel, so width is actually a number of bits.
-// A row will always be stored in bytes, so we round width up to the
-// nearest multiple of 8 to get the number of bits actually in the row.
-// We then divide by 8 to convert to bytes.
-static inline size_t get_src_row_bytes(int width) {
- return SkAlign8(width) >> 3;
-}
-
-static inline void setup_color_table(SkColorType colorType,
- SkPMColor* colorPtr, int* colorCount) {
- if (kIndex_8_SkColorType == colorType) {
- colorPtr[0] = SK_ColorBLACK;
- colorPtr[1] = SK_ColorWHITE;
- *colorCount = 2;
- }
-}
-
-static bool read_byte(SkStream* stream, uint8_t* data)
-{
- return stream->read(data, 1) == 1;
-}
-
-// http://en.wikipedia.org/wiki/Variable-length_quantity
-static bool read_mbf(SkStream* stream, uint64_t* value) {
- uint64_t n = 0;
- uint8_t data;
- const uint64_t kLimit = 0xFE00000000000000;
- SkASSERT(kLimit == ~((~static_cast<uint64_t>(0)) >> 7));
- do {
- if (n & kLimit) { // Will overflow on shift by 7.
- return false;
- }
- if (stream->read(&data, 1) != 1) {
- return false;
- }
- n = (n << 7) | (data & 0x7F);
- } while (data & 0x80);
- *value = n;
- return true;
-}
-
-static bool read_header(SkStream* stream, SkISize* size) {
- {
- uint8_t data;
- if (!read_byte(stream, &data) || data != 0) { // unknown type
- return false;
- }
- if (!read_byte(stream, &data) || (data & 0x9F)) { // skip fixed header
- return false;
- }
- }
-
- uint64_t width, height;
- if (!read_mbf(stream, &width) || width > 0xFFFF || !width) {
- return false;
- }
- if (!read_mbf(stream, &height) || height > 0xFFFF || !height) {
- return false;
- }
- if (size) {
- *size = SkISize::Make(SkToS32(width), SkToS32(height));
- }
- return true;
-}
-
-bool SkWbmpCodec::onRewind() {
- return read_header(this->stream(), nullptr);
-}
-
-SkSwizzler* SkWbmpCodec::initializeSwizzler(const SkImageInfo& info, const SkPMColor* ctable,
- const Options& opts) {
- // Create the swizzler based on the desired color type
- switch (info.colorType()) {
- case kIndex_8_SkColorType:
- case kN32_SkColorType:
- case kRGB_565_SkColorType:
- case kGray_8_SkColorType:
- break;
- default:
- return nullptr;
- }
- return SkSwizzler::CreateSwizzler(SkSwizzler::kBit, ctable, info, opts);
-}
-
-bool SkWbmpCodec::readRow(uint8_t* row) {
- return this->stream()->read(row, fSrcRowBytes) == fSrcRowBytes;
-}
-
-SkWbmpCodec::SkWbmpCodec(const SkImageInfo& info, SkStream* stream)
- : INHERITED(info, stream)
- , fSrcRowBytes(get_src_row_bytes(this->getInfo().width()))
- , fSwizzler(nullptr)
- , fColorTable(nullptr)
-{}
-
-SkEncodedFormat SkWbmpCodec::onGetEncodedFormat() const {
- return kWBMP_SkEncodedFormat;
-}
-
-SkCodec::Result SkWbmpCodec::onGetPixels(const SkImageInfo& info,
- void* dst,
- size_t rowBytes,
- const Options& options,
- SkPMColor ctable[],
- int* ctableCount,
- int* rowsDecoded) {
- if (options.fSubset) {
- // Subsets are not supported.
- return kUnimplemented;
- }
-
- if (!valid_alpha(info.alphaType(), this->getInfo().alphaType())) {
- return kInvalidConversion;
- }
-
- // Prepare a color table if necessary
- setup_color_table(info.colorType(), ctable, ctableCount);
-
- // Initialize the swizzler
- SkAutoTDelete<SkSwizzler> swizzler(this->initializeSwizzler(info, ctable, options));
- if (nullptr == swizzler.get()) {
- return kInvalidConversion;
- }
-
- // Perform the decode
- SkISize size = info.dimensions();
- SkAutoTMalloc<uint8_t> src(fSrcRowBytes);
- void* dstRow = dst;
- for (int y = 0; y < size.height(); ++y) {
- if (!this->readRow(src.get())) {
- *rowsDecoded = y;
- return kIncompleteInput;
- }
- swizzler->swizzle(dstRow, src.get());
- dstRow = SkTAddOffset<void>(dstRow, rowBytes);
- }
- return kSuccess;
-}
-
-bool SkWbmpCodec::IsWbmp(const void* buffer, size_t bytesRead) {
- SkAutoTUnref<SkData> data(SkData::NewWithoutCopy(buffer, bytesRead));
- SkMemoryStream stream(data);
- return read_header(&stream, nullptr);
-}
-
-SkCodec* SkWbmpCodec::NewFromStream(SkStream* stream) {
- SkAutoTDelete<SkStream> streamDeleter(stream);
- SkISize size;
- if (!read_header(stream, &size)) {
- return nullptr;
- }
- SkImageInfo info = SkImageInfo::Make(size.width(), size.height(),
- kGray_8_SkColorType, kOpaque_SkAlphaType);
- return new SkWbmpCodec(info, streamDeleter.detach());
-}
-
-int SkWbmpCodec::onGetScanlines(void* dst, int count, size_t dstRowBytes) {
- void* dstRow = dst;
- for (int y = 0; y < count; ++y) {
- if (!this->readRow(fSrcBuffer.get())) {
- return y;
- }
- fSwizzler->swizzle(dstRow, fSrcBuffer.get());
- dstRow = SkTAddOffset<void>(dstRow, dstRowBytes);
- }
- return count;
-}
-
-SkCodec::Result SkWbmpCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
- const Options& options, SkPMColor inputColorTable[], int* inputColorCount) {
- if (options.fSubset) {
- // Subsets are not supported.
- return kUnimplemented;
- }
-
- if (!valid_alpha(dstInfo.alphaType(), this->getInfo().alphaType())) {
- return kInvalidConversion;
- }
-
- // Fill in the color table
- setup_color_table(dstInfo.colorType(), inputColorTable, inputColorCount);
-
- // Copy the color table to a pointer that can be owned by the scanline decoder
- if (kIndex_8_SkColorType == dstInfo.colorType()) {
- fColorTable.reset(new SkColorTable(inputColorTable, 2));
- }
-
- // Initialize the swizzler
- fSwizzler.reset(this->initializeSwizzler(dstInfo, get_color_ptr(fColorTable.get()), options));
- if (nullptr == fSwizzler.get()) {
- return kInvalidConversion;
- }
-
- fSrcBuffer.reset(fSrcRowBytes);
-
- return kSuccess;
-}
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