Rename encoders to Sk*ImageEncoder

src/images/SkImageDecoder_ktx.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 "SkColorPriv.h"
-#include "SkImageEncoder.h"
-#include "SkImageGenerator.h"
-#include "SkPixelRef.h"
-#include "SkStream.h"
-#include "SkStreamPriv.h"
-#include "SkTypes.h"
-
-#include "ktx.h"
-#include "etc1.h"
-
-///////////////////////////////////////////////////////////////////////////////
-
-// KTX Image Encoder
-//
-// KTX is a general texture data storage file format ratified by the Khronos Group. As an
-// overview, a KTX file contains all of the appropriate values needed to fully specify a
-// texture in an OpenGL application, including the use of compressed data.
-//
-// This encoder takes a best guess at how to encode the bitmap passed to it. If
-// there is an installed discardable pixel ref with existing PKM data, then we
-// will repurpose the existing ETC1 data into a KTX file. If the data contains
-// KTX data, then we simply return a copy of the same data. For all other files,
-// the underlying KTX library tries to do its best to encode the appropriate
-// data specified by the bitmap based on the config. (i.e. kAlpha8_Config will
-// be represented as a full resolution 8-bit image dump with the appropriate
-// OpenGL defines in the header).
-
-class SkKTXImageEncoder : public SkImageEncoder {
-protected:
-    bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) override;
-
-private:
-    virtual bool encodePKM(SkWStream* stream, const SkData *data);
-    typedef SkImageEncoder INHERITED;
-};
-
-bool SkKTXImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bitmap, int) {
-    if (!bitmap.pixelRef()) {
-        return false;
-    }
-    SkAutoDataUnref data(bitmap.pixelRef()->refEncodedData());
-
-    // Is this even encoded data?
-    if (data) {
-        const uint8_t *bytes = data->bytes();
-        if (etc1_pkm_is_valid(bytes)) {
-            return this->encodePKM(stream, data);
-        }
-
-        // Is it a KTX file??
-        if (SkKTXFile::is_ktx(bytes)) {
-            return stream->write(bytes, data->size());
-        }
-        
-        // If it's neither a KTX nor a PKM, then we need to
-        // get at the actual pixels, so fall through and decompress...
-    }
-
-    return SkKTXFile::WriteBitmapToKTX(stream, bitmap);
-}
-
-bool SkKTXImageEncoder::encodePKM(SkWStream* stream, const SkData *data) {
-    const uint8_t* bytes = data->bytes();
-    SkASSERT(etc1_pkm_is_valid(bytes));
-
-    etc1_uint32 width = etc1_pkm_get_width(bytes);
-    etc1_uint32 height = etc1_pkm_get_height(bytes);
-
-    // ETC1 Data is stored as compressed 4x4 pixel blocks, so we must make sure
-    // that our dimensions are valid.
-    if (width == 0 || (width & 3) != 0 || height == 0 || (height & 3) != 0) {
-        return false;
-    }
-
-    // Advance pointer to etc1 data.
-    bytes += ETC_PKM_HEADER_SIZE;
-
-    return SkKTXFile::WriteETC1ToKTX(stream, bytes, width, height);
-}
-
-/////////////////////////////////////////////////////////////////////////////////////////
-DEFINE_ENCODER_CREATOR(KTXImageEncoder);
-/////////////////////////////////////////////////////////////////////////////////////////
-
-SkImageEncoder* sk_libktx_efactory(SkImageEncoder::Type t) {
-    return (SkImageEncoder::kKTX_Type == t) ? new SkKTXImageEncoder : nullptr;
-}
-
-static SkImageEncoder_EncodeReg gEReg(sk_libktx_efactory);