506e19a4c8
This will expose the BitmapRegionDecoder API as a public include and move the implementation to src. This makes this code more naturally exposed in Android and easier to test in DM and nanobench. BUG=skia: Review URL: https://codereview.chromium.org/1438873002
91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
/*
|
|
* 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 SkBitmapRegionDecoder_DEFINED
|
|
#define SkBitmapRegionDecoder_DEFINED
|
|
|
|
#include "SkBitmap.h"
|
|
#include "SkBRDAllocator.h"
|
|
#include "SkEncodedFormat.h"
|
|
#include "SkStream.h"
|
|
|
|
/*
|
|
* This class aims to provide an interface to test multiple implementations of
|
|
* SkBitmapRegionDecoder.
|
|
*/
|
|
class SkBitmapRegionDecoder {
|
|
public:
|
|
|
|
enum Strategy {
|
|
kCanvas_Strategy, // Draw to the canvas, uses SkCodec
|
|
kAndroidCodec_Strategy, // Uses SkAndroidCodec for scaling and subsetting
|
|
};
|
|
|
|
/*
|
|
* @param data Refs the data while this object exists, unrefs on destruction
|
|
* @param strategy Strategy used for scaling and subsetting
|
|
* @return Tries to create an SkBitmapRegionDecoder, returns NULL on failure
|
|
*/
|
|
static SkBitmapRegionDecoder* Create(
|
|
SkData* data, Strategy strategy);
|
|
|
|
/*
|
|
* @param stream Takes ownership of the stream
|
|
* @param strategy Strategy used for scaling and subsetting
|
|
* @return Tries to create an SkBitmapRegionDecoder, returns NULL on failure
|
|
*/
|
|
static SkBitmapRegionDecoder* Create(
|
|
SkStreamRewindable* stream, Strategy strategy);
|
|
|
|
/*
|
|
* Decode a scaled region of the encoded image stream
|
|
*
|
|
* @param bitmap Container for decoded pixels. It is assumed that the pixels
|
|
* are initially unallocated and will be allocated by this function.
|
|
* @param allocator Allocator for the pixels. If this is NULL, the default
|
|
* allocator (HeapAllocator) will be used.
|
|
* @param desiredSubset Subset of the original image to decode.
|
|
* @param sampleSize An integer downscaling factor for the decode.
|
|
* @param colorType Preferred output colorType.
|
|
* New implementations should return NULL if they do not support
|
|
* decoding to this color type.
|
|
* The old kOriginal_Strategy will decode to a default color type
|
|
* if this color type is unsupported.
|
|
* @param requireUnpremul If the image is not opaque, we will use this to determine the
|
|
* alpha type to use.
|
|
*
|
|
*/
|
|
virtual bool decodeRegion(SkBitmap* bitmap, SkBRDAllocator* allocator,
|
|
const SkIRect& desiredSubset, int sampleSize,
|
|
SkColorType colorType, bool requireUnpremul) = 0;
|
|
/*
|
|
* @param Requested destination color type
|
|
* @return true if we support the requested color type and false otherwise
|
|
*/
|
|
virtual bool conversionSupported(SkColorType colorType) = 0;
|
|
|
|
virtual SkEncodedFormat getEncodedFormat() = 0;
|
|
|
|
int width() const { return fWidth; }
|
|
int height() const { return fHeight; }
|
|
|
|
virtual ~SkBitmapRegionDecoder() {}
|
|
|
|
protected:
|
|
|
|
SkBitmapRegionDecoder(int width, int height)
|
|
: fWidth(width)
|
|
, fHeight(height)
|
|
{}
|
|
|
|
private:
|
|
const int fWidth;
|
|
const int fHeight;
|
|
};
|
|
|
|
#endif
|