7571f9e490
Mechanically updated via Xcode "Replace Regular Expression":
typedef (.*) INHERITED;
-->
using INHERITED = $1;
The ClangTidy approach generated an even larger CL which would have
required a significant amount of hand-tweaking to be usable.
Change-Id: I671dc9d9efdf6d60151325c8d4d13fad7e10a15b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/314999
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/*
|
|
* Copyright 2017 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkPngEncoder_DEFINED
|
|
#define SkPngEncoder_DEFINED
|
|
|
|
#include "include/core/SkDataTable.h"
|
|
#include "include/encode/SkEncoder.h"
|
|
|
|
class SkPngEncoderMgr;
|
|
class SkWStream;
|
|
|
|
class SK_API SkPngEncoder : public SkEncoder {
|
|
public:
|
|
|
|
enum class FilterFlag : int {
|
|
kZero = 0x00,
|
|
kNone = 0x08,
|
|
kSub = 0x10,
|
|
kUp = 0x20,
|
|
kAvg = 0x40,
|
|
kPaeth = 0x80,
|
|
kAll = kNone | kSub | kUp | kAvg | kPaeth,
|
|
};
|
|
|
|
struct Options {
|
|
/**
|
|
* Selects which filtering strategies to use.
|
|
*
|
|
* If a single filter is chosen, libpng will use that filter for every row.
|
|
*
|
|
* If multiple filters are chosen, libpng will use a heuristic to guess which filter
|
|
* will encode smallest, then apply that filter. This happens on a per row basis,
|
|
* different rows can use different filters.
|
|
*
|
|
* Using a single filter (or less filters) is typically faster. Trying all of the
|
|
* filters may help minimize the output file size.
|
|
*
|
|
* Our default value matches libpng's default.
|
|
*/
|
|
FilterFlag fFilterFlags = FilterFlag::kAll;
|
|
|
|
/**
|
|
* Must be in [0, 9] where 9 corresponds to maximal compression. This value is passed
|
|
* directly to zlib. 0 is a special case to skip zlib entirely, creating dramatically
|
|
* larger pngs.
|
|
*
|
|
* Our default value matches libpng's default.
|
|
*/
|
|
int fZLibLevel = 6;
|
|
|
|
/**
|
|
* Represents comments in the tEXt ancillary chunk of the png.
|
|
* The 2i-th entry is the keyword for the i-th comment,
|
|
* and the (2i + 1)-th entry is the text for the i-th comment.
|
|
*/
|
|
sk_sp<SkDataTable> fComments;
|
|
};
|
|
|
|
/**
|
|
* Encode the |src| pixels to the |dst| stream.
|
|
* |options| may be used to control the encoding behavior.
|
|
*
|
|
* Returns true on success. Returns false on an invalid or unsupported |src|.
|
|
*/
|
|
static bool Encode(SkWStream* dst, const SkPixmap& src, const Options& options);
|
|
|
|
/**
|
|
* Create a png encoder that will encode the |src| pixels to the |dst| stream.
|
|
* |options| may be used to control the encoding behavior.
|
|
*
|
|
* |dst| is unowned but must remain valid for the lifetime of the object.
|
|
*
|
|
* This returns nullptr on an invalid or unsupported |src|.
|
|
*/
|
|
static std::unique_ptr<SkEncoder> Make(SkWStream* dst, const SkPixmap& src,
|
|
const Options& options);
|
|
|
|
~SkPngEncoder() override;
|
|
|
|
protected:
|
|
bool onEncodeRows(int numRows) override;
|
|
|
|
SkPngEncoder(std::unique_ptr<SkPngEncoderMgr>, const SkPixmap& src);
|
|
|
|
std::unique_ptr<SkPngEncoderMgr> fEncoderMgr;
|
|
using INHERITED = SkEncoder;
|
|
};
|
|
|
|
static inline SkPngEncoder::FilterFlag operator|(SkPngEncoder::FilterFlag x,
|
|
SkPngEncoder::FilterFlag y) {
|
|
return (SkPngEncoder::FilterFlag)((int)x | (int)y);
|
|
}
|
|
|
|
#endif
|