Revert of Add SkCodec, including PNG implementation.

src/codec/SkSwizzler.h

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkSwizzler_DEFINED
-#define SkSwizzler_DEFINED
-
-#include "SkTypes.h"
-#include "SkColor.h"
-#include "SkImageInfo.h"
-
-class SkSwizzler : public SkNoncopyable {
-public:
-    /**
-     *  Enum describing the config of the source data.
-     */
-    enum SrcConfig {
-        kGray,  // 1 byte per pixel
-        kIndex, // 1 byte per pixel
-        kRGB,   // 3 bytes per pixel
-        kRGBX,  // 4 byes per pixel (ignore 4th)
-        kRGBA,  // 4 bytes per pixel
-        kRGB_565 // 2 bytes per pixel
-    };
-
-    static int BytesPerPixel(SrcConfig sc) {
-        switch (sc) {
-            case kGray:
-            case kIndex:
-                return 1;
-            case kRGB:
-                return 3;
-            case kRGBX:
-            case kRGBA:
-                return 4;
-            case kRGB_565:
-                return 2;
-            default:
-                SkDebugf("invalid source config passed to BytesPerPixel\n");
-                return -1;
-        }
-    }
-
-    /**
-     *  Create a new SkSwizzler.
-     *  @param sc SrcConfig
-     *  @param info dimensions() describe both the src and the dst.
-     *              Other fields describe the dst.
-     *  @param dst Destination to write pixels. Must match info and dstRowBytes
-     *  @param dstRowBytes rowBytes for dst.
-     *  @param skipZeroes Whether to skip writing zeroes. Useful if dst is
-     *              zero-initialized. The implementation may or may not respect this.
-     *  @return A new SkSwizzler or NULL on failure.
-     */
-    static SkSwizzler* CreateSwizzler(SrcConfig sc, const SkPMColor* ctable,
-                                      const SkImageInfo& info, void* dst,
-                                      size_t dstRowBytes, bool skipZeroes);
-    /**
-     *  Swizzle the next line. Call height times, once for each row of source.
-     *  @param src The next row of the source data.
-     *  @return Whether the row had non-opaque alpha.
-     */
-    bool next(const uint8_t* SK_RESTRICT src);
-private:
-    /**
-     *  Method for converting raw data to Skia pixels.
-     *  @param dstRow Row in which to write the resulting pixels.
-     *  @param src Row of src data, in format specified by SrcConfig
-     *  @param width Width in pixels
-     *  @param bpp bytes per pixel of the source.
-     *  @param y Line of source.
-     *  @param ctable Colors (used for kIndex source).
-     */
-    typedef bool (*RowProc)(void* SK_RESTRICT dstRow,
-                            const uint8_t* SK_RESTRICT src,
-                            int width, int bpp, int y,
-                            const SkPMColor ctable[]);
-
-    const RowProc       fRowProc;
-    const SkPMColor*    fColorTable;    // Unowned pointer
-    const int           fSrcPixelSize;
-    const SkImageInfo   fDstInfo;
-    void*               fDstRow;
-    const size_t        fDstRowBytes;
-    int                 fCurrY;
-
-    SkSwizzler(RowProc proc, const SkPMColor* ctable, int srcBpp,
-               const SkImageInfo& info, void* dst, size_t rowBytes);
-
-};
-#endif // SkSwizzler_DEFINED