Delete SkImageDecoder

src/images/SkImageDecoder_astc.cpp

-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkData.h"
-#include "SkEndian.h"
-#include "SkColorPriv.h"
-#include "SkImageDecoder.h"
-#include "SkScaledBitmapSampler.h"
-#include "SkStream.h"
-#include "SkStreamPriv.h"
-#include "SkTypes.h"
-
-#include "SkTextureCompressor.h"
-
-class SkASTCImageDecoder : public SkImageDecoder {
-public:
-    SkASTCImageDecoder() { }
-
-    Format getFormat() const override {
-        return kASTC_Format;
-    }
-
-protected:
-    Result onDecode(SkStream* stream, SkBitmap* bm, Mode) override;
-
-private:
-    typedef SkImageDecoder INHERITED;
-};
-
-/////////////////////////////////////////////////////////////////////////////////////////
-
-static const uint32_t kASTCMagicNumber = 0x5CA1AB13;
-
-static inline int read_24bit(const uint8_t* buf) {
-    // Assume everything is little endian...
-    return
-        static_cast<int>(buf[0]) |
-        (static_cast<int>(buf[1]) << 8) |
-        (static_cast<int>(buf[2]) << 16);
-}
-
-SkImageDecoder::Result SkASTCImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
-    auto data = SkCopyStreamToData(stream);
-    if (!data || !data->size()) {
-        return kFailure;
-    }
-
-    unsigned char* buf = (unsigned char*) data->data();
-
-    // Make sure that the magic header is there...
-    SkASSERT(SkEndian_SwapLE32(*(reinterpret_cast<uint32_t*>(buf))) == kASTCMagicNumber);
-
-    // Advance past the magic header
-    buf += 4;
-
-    const int blockDimX = buf[0];
-    const int blockDimY = buf[1];
-    const int blockDimZ = buf[2];
-
-    if (1 != blockDimZ) {
-        // We don't support decoding 3D
-        return kFailure;
-    }
-
-    // Choose the proper ASTC format
-    SkTextureCompressor::Format astcFormat;
-    if (4 == blockDimX && 4 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_4x4_Format;
-    } else if (5 == blockDimX && 4 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_5x4_Format;
-    } else if (5 == blockDimX && 5 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_5x5_Format;
-    } else if (6 == blockDimX && 5 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_6x5_Format;
-    } else if (6 == blockDimX && 6 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_6x6_Format;
-    } else if (8 == blockDimX && 5 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_8x5_Format;
-    } else if (8 == blockDimX && 6 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_8x6_Format;
-    } else if (8 == blockDimX && 8 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_8x8_Format;
-    } else if (10 == blockDimX && 5 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_10x5_Format;
-    } else if (10 == blockDimX && 6 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_10x6_Format;
-    } else if (10 == blockDimX && 8 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_10x8_Format;
-    } else if (10 == blockDimX && 10 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_10x10_Format;
-    } else if (12 == blockDimX && 10 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_12x10_Format;
-    } else if (12 == blockDimX && 12 == blockDimY) {
-        astcFormat = SkTextureCompressor::kASTC_12x12_Format;
-    } else {
-        // We don't support any other block dimensions..
-        return kFailure;
-    }
-
-    // Advance buf past the block dimensions
-    buf += 3;
-
-    // Read the width/height/depth from the buffer...
-    const int width = read_24bit(buf);
-    const int height = read_24bit(buf + 3);
-    const int depth = read_24bit(buf + 6);
-
-    if (1 != depth) {
-        // We don't support decoding 3D.
-        return kFailure;
-    }
-
-    // Advance the buffer past the image dimensions
-    buf += 9;
-
-    // Setup the sampler...
-    SkScaledBitmapSampler sampler(width, height, this->getSampleSize());
-
-    // Determine the alpha of the bitmap...
-    SkAlphaType alphaType = kOpaque_SkAlphaType;
-    if (this->getRequireUnpremultipliedColors()) {
-        alphaType = kUnpremul_SkAlphaType;
-    } else {
-        alphaType = kPremul_SkAlphaType;
-    }
-
-    // Set the config...
-    bm->setInfo(SkImageInfo::MakeN32(sampler.scaledWidth(), sampler.scaledHeight(), alphaType));
-
-    if (SkImageDecoder::kDecodeBounds_Mode == mode) {
-        return kSuccess;
-    }
-
-    if (!this->allocPixelRef(bm, nullptr)) {
-        return kFailure;
-    }
-
-    // Lock the pixels, since we're about to write to them...
-    SkAutoLockPixels alp(*bm);
-
-    if (!sampler.begin(bm, SkScaledBitmapSampler::kRGBA, *this)) {
-        return kFailure;
-    }
-
-    // ASTC Data is encoded as RGBA pixels, so we should extract it as such
-    int nPixels = width * height;
-    SkAutoMalloc outRGBAData(nPixels * 4);
-    uint8_t *outRGBADataPtr = reinterpret_cast<uint8_t *>(outRGBAData.get());
-
-    // Decode ASTC
-    if (!SkTextureCompressor::DecompressBufferFromFormat(
-            outRGBADataPtr, width*4, buf, width, height, astcFormat)) {
-        return kFailure;
-    }
-
-    // Set each of the pixels...
-    const int srcRowBytes = width * 4;
-    const int dstHeight = sampler.scaledHeight();
-    const uint8_t *srcRow = reinterpret_cast<uint8_t *>(outRGBADataPtr);
-    srcRow += sampler.srcY0() * srcRowBytes;
-    for (int y = 0; y < dstHeight; ++y) {
-        sampler.next(srcRow);
-        srcRow += sampler.srcDY() * srcRowBytes;
-    }
-
-    return kSuccess;
-}
-
-/////////////////////////////////////////////////////////////////////////////////////////
-DEFINE_DECODER_CREATOR(ASTCImageDecoder);
-/////////////////////////////////////////////////////////////////////////////////////////
-
-static bool is_astc(SkStreamRewindable* stream) {
-    // Read the ASTC header and make sure it's valid.
-    uint32_t magic;
-    if (stream->read((void*)&magic, 4) != 4) {
-        return false;
-    }
-
-    return kASTCMagicNumber == SkEndian_SwapLE32(magic);
-}
-
-static SkImageDecoder* sk_libastc_dfactory(SkStreamRewindable* stream) {
-    if (is_astc(stream)) {
-        return new SkASTCImageDecoder;
-    }
-    return nullptr;
-}
-
-static SkImageDecoder_DecodeReg gReg(sk_libastc_dfactory);
-
-static SkImageDecoder::Format get_format_astc(SkStreamRewindable* stream) {
-    if (is_astc(stream)) {
-        return SkImageDecoder::kASTC_Format;
-    }
-    return SkImageDecoder::kUnknown_Format;
-}
-
-static SkImageDecoder_FormatReg gFormatReg(get_format_astc);