f698c8262d
If the original image is grayscale, allow decoding into A8. Change the size of PrefConfigTable to allow for 8bit gray, a new source config. Add a new sampler to SkScaledBitmapSampler to 'convert' to A8. FIXME: Should there be a dithered option for gray scale? R=reed@google.com Review URL: https://codereview.chromium.org/18083026 git-svn-id: http://skia.googlecode.com/svn/trunk@10157 2bbb7eff-a529-9590-31e7-b0007b416f81
561 lines
22 KiB
C++
561 lines
22 KiB
C++
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkImageDecoder_DEFINED
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#define SkImageDecoder_DEFINED
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#include "SkBitmap.h"
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#include "SkBitmapFactory.h"
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#include "SkImage.h"
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#include "SkRect.h"
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#include "SkRefCnt.h"
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#include "SkTypes.h"
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class SkStream;
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/** \class SkImageDecoder
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Base class for decoding compressed images into a SkBitmap
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*/
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class SkImageDecoder : public SkNoncopyable {
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public:
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virtual ~SkImageDecoder();
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enum Format {
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kUnknown_Format,
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kBMP_Format,
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kGIF_Format,
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kICO_Format,
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kJPEG_Format,
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kPNG_Format,
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kWBMP_Format,
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kWEBP_Format,
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kLastKnownFormat = kWEBP_Format,
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};
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/** Return the format of image this decoder can decode. If this decoder can decode multiple
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formats, kUnknown_Format will be returned.
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*/
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virtual Format getFormat() const;
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/** Return the format of the SkStream or kUnknown_Format if it cannot be determined. Rewinds the
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stream before returning.
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*/
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static Format GetStreamFormat(SkStream*);
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/** Return a readable string of the Format provided.
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*/
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static const char* GetFormatName(Format);
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/** Return a readable string of the value returned by getFormat().
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*/
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const char* getFormatName() const;
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/** Returns true if the decoder should try to dither the resulting image.
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The default setting is true.
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*/
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bool getDitherImage() const { return fDitherImage; }
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/** Set to true if the the decoder should try to dither the resulting image.
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The default setting is true.
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*/
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void setDitherImage(bool dither) { fDitherImage = dither; }
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/** Returns true if the decoder should try to decode the
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resulting image to a higher quality even at the expense of
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the decoding speed.
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*/
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bool getPreferQualityOverSpeed() const { return fPreferQualityOverSpeed; }
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/** Set to true if the the decoder should try to decode the
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resulting image to a higher quality even at the expense of
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the decoding speed.
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*/
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void setPreferQualityOverSpeed(bool qualityOverSpeed) {
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fPreferQualityOverSpeed = qualityOverSpeed;
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}
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/** Set to true to require the decoder to return a bitmap with unpremultiplied
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colors. The default is false, meaning the resulting bitmap will have its
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colors premultiplied.
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NOTE: Passing true to this function may result in a bitmap which cannot
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be properly used by Skia.
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*/
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void setRequireUnpremultipliedColors(bool request) {
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fRequireUnpremultipliedColors = request;
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}
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/** Returns true if the decoder will only return bitmaps with unpremultiplied
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colors.
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*/
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bool getRequireUnpremultipliedColors() const { return fRequireUnpremultipliedColors; }
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/** \class Peeker
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Base class for optional callbacks to retrieve meta/chunk data out of
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an image as it is being decoded.
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*/
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class Peeker : public SkRefCnt {
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public:
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SK_DECLARE_INST_COUNT(Peeker)
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/** Return true to continue decoding, or false to indicate an error, which
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will cause the decoder to not return the image.
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*/
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virtual bool peek(const char tag[], const void* data, size_t length) = 0;
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private:
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typedef SkRefCnt INHERITED;
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};
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Peeker* getPeeker() const { return fPeeker; }
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Peeker* setPeeker(Peeker*);
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/** \class Chooser
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Base class for optional callbacks to choose an image from a format that
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contains multiple images.
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*/
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class Chooser : public SkRefCnt {
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public:
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SK_DECLARE_INST_COUNT(Chooser)
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virtual void begin(int count) {}
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virtual void inspect(int index, SkBitmap::Config config, int width, int height) {}
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/** Return the index of the subimage you want, or -1 to choose none of them.
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*/
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virtual int choose() = 0;
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private:
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typedef SkRefCnt INHERITED;
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};
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Chooser* getChooser() const { return fChooser; }
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Chooser* setChooser(Chooser*);
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/**
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@Deprecated. Use the struct version instead.
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This optional table describes the caller's preferred config based on
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information about the src data. For this table, the src attributes are
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described in terms of depth (index (8), 16, 32/24) and if there is
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per-pixel alpha. These inputs combine to create an index into the
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pref[] table, which contains the caller's preferred config for that
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input, or kNo_Config if there is no preference.
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To specify no preference, call setPrefConfigTable(NULL), which is
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the default.
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Note, it is still at the discretion of the codec as to what output
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config is actually returned, as it may not be able to support the
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caller's preference.
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Here is how the index into the table is computed from the src:
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depth [8, 16, 32/24] -> 0, 2, 4
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alpha [no, yes] -> 0, 1
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The two index values are OR'd together.
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src: 8-index, no-alpha -> 0
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src: 8-index, yes-alpha -> 1
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src: 16bit, no-alpha -> 2 // e.g. 565
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src: 16bit, yes-alpha -> 3 // e.g. 1555
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src: 32/24, no-alpha -> 4
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src: 32/24, yes-alpha -> 5
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*/
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void setPrefConfigTable(const SkBitmap::Config pref[6]);
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/**
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* Optional table describing the caller's preferred config based on
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* information about the src data. Each field should be set to the
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* preferred config for a src described in the name of the field. The
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* src attributes are described in terms of depth (8-index,
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* 8bit-grayscale, or 8-bits/component) and whether there is per-pixel
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* alpha (does not apply to grayscale). If the caller has no preference
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* for a particular src type, its slot should be set to kNo_Config.
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*
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* NOTE ABOUT PREFERRED CONFIGS:
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* If a config is preferred, either using a pref table or as a parameter
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* to some flavor of decode, it is still at the discretion of the codec
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* as to what output config is actually returned, as it may not be able
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* to support the caller's preference.
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*
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* If a bitmap is decoded into SkBitmap::A8_Config, the resulting bitmap
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* will either be a conversion of the grayscale in the case of a
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* grayscale source or the alpha channel in the case of a source with
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* an alpha channel.
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*/
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struct PrefConfigTable {
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SkBitmap::Config fPrefFor_8Index_NoAlpha_src;
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SkBitmap::Config fPrefFor_8Index_YesAlpha_src;
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SkBitmap::Config fPrefFor_8Gray_src;
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SkBitmap::Config fPrefFor_8bpc_NoAlpha_src;
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SkBitmap::Config fPrefFor_8bpc_YesAlpha_src;
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};
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/**
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* Set an optional table for specifying the caller's preferred config
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* based on information about the src data.
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*
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* The default is no preference, which will assume the config set by
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* decode is preferred.
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*/
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void setPrefConfigTable(const PrefConfigTable&);
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/**
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* Do not use a PrefConfigTable to determine the output config. This
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* is the default, so there is no need to call unless a PrefConfigTable
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* was previously set.
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*/
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void resetPrefConfigTable() { fUsePrefTable = false; }
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SkBitmap::Allocator* getAllocator() const { return fAllocator; }
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SkBitmap::Allocator* setAllocator(SkBitmap::Allocator*);
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// sample-size, if set to > 1, tells the decoder to return a smaller than
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// original bitmap, sampling 1 pixel for every size pixels. e.g. if sample
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// size is set to 3, then the returned bitmap will be 1/3 as wide and high,
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// and will contain 1/9 as many pixels as the original.
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// Note: this is a hint, and the codec may choose to ignore this, or only
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// approximate the sample size.
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int getSampleSize() const { return fSampleSize; }
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void setSampleSize(int size);
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/** Reset the sampleSize to its default of 1
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*/
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void resetSampleSize() { this->setSampleSize(1); }
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/** Decoding is synchronous, but for long decodes, a different thread can
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call this method safely. This sets a state that the decoders will
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periodically check, and if they see it changed to cancel, they will
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cancel. This will result in decode() returning false. However, there is
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no guarantee that the decoder will see the state change in time, so
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it is possible that cancelDecode() will be called, but will be ignored
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and decode() will return true (assuming no other problems were
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encountered).
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This state is automatically reset at the beginning of decode().
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*/
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void cancelDecode() {
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// now the subclass must query shouldCancelDecode() to be informed
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// of the request
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fShouldCancelDecode = true;
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}
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/** Passed to the decode method. If kDecodeBounds_Mode is passed, then
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only the bitmap's width/height/config need be set. If kDecodePixels_Mode
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is passed, then the bitmap must have pixels or a pixelRef.
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*/
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enum Mode {
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kDecodeBounds_Mode, //!< only return width/height/config in bitmap
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kDecodePixels_Mode //!< return entire bitmap (including pixels)
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};
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/** Given a stream, decode it into the specified bitmap.
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If the decoder can decompress the image, it calls bitmap.setConfig(),
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and then if the Mode is kDecodePixels_Mode, call allocPixelRef(),
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which will allocated a pixelRef. To access the pixel memory, the codec
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needs to call lockPixels/unlockPixels on the
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bitmap. It can then set the pixels with the decompressed image.
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* If the image cannot be decompressed, return false. After the
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* decoding, the function converts the decoded config in bitmap
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* to pref if possible. Whether a conversion is feasible is
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* tested by Bitmap::canCopyTo(pref).
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If an SkBitmap::Allocator is installed via setAllocator, it will be
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used to allocate the pixel memory. A clever allocator can be used
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to allocate the memory from a cache, volatile memory, or even from
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an existing bitmap's memory.
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If a Peeker is installed via setPeeker, it may be used to peek into
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meta data during the decode.
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If a Chooser is installed via setChooser, it may be used to select
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which image to return from a format that contains multiple images.
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*/
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bool decode(SkStream*, SkBitmap* bitmap, SkBitmap::Config pref, Mode);
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bool decode(SkStream* stream, SkBitmap* bitmap, Mode mode) {
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return this->decode(stream, bitmap, SkBitmap::kNo_Config, mode);
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}
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/**
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* Given a stream, build an index for doing tile-based decode.
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* The built index will be saved in the decoder, and the image size will
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* be returned in width and height.
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*
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* Return true for success or false on failure.
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*/
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bool buildTileIndex(SkStream*, int *width, int *height);
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/**
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* Decode a rectangle subset in the image.
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* The method can only be called after buildTileIndex().
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*
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* Return true for success.
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* Return false if the index is never built or failing in decoding.
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*/
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bool decodeSubset(SkBitmap* bm, const SkIRect& subset, SkBitmap::Config pref);
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/**
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* @Deprecated
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* Use decodeSubset instead.
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*/
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bool decodeRegion(SkBitmap* bitmap, const SkIRect& rect, SkBitmap::Config pref) {
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return this->decodeSubset(bitmap, rect, pref);
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}
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/** Given a stream, this will try to find an appropriate decoder object.
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If none is found, the method returns NULL.
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*/
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static SkImageDecoder* Factory(SkStream*);
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/** Decode the image stored in the specified file, and store the result
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in bitmap. Return true for success or false on failure.
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@param prefConfig If the PrefConfigTable is not set, prefer this config.
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See NOTE ABOUT PREFERRED CONFIGS.
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@param format On success, if format is non-null, it is set to the format
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of the decoded file. On failure it is ignored.
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*/
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static bool DecodeFile(const char file[], SkBitmap* bitmap,
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SkBitmap::Config prefConfig, Mode,
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Format* format = NULL);
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static bool DecodeFile(const char file[], SkBitmap* bitmap) {
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return DecodeFile(file, bitmap, SkBitmap::kNo_Config,
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kDecodePixels_Mode, NULL);
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}
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/** Decode the image stored in the specified memory buffer, and store the
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result in bitmap. Return true for success or false on failure.
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@param prefConfig If the PrefConfigTable is not set, prefer this config.
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See NOTE ABOUT PREFERRED CONFIGS.
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@param format On success, if format is non-null, it is set to the format
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of the decoded buffer. On failure it is ignored.
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*/
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static bool DecodeMemory(const void* buffer, size_t size, SkBitmap* bitmap,
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SkBitmap::Config prefConfig, Mode,
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Format* format = NULL);
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static bool DecodeMemory(const void* buffer, size_t size, SkBitmap* bitmap){
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return DecodeMemory(buffer, size, bitmap, SkBitmap::kNo_Config,
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kDecodePixels_Mode, NULL);
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}
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/**
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* Decode memory.
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* @param info Output parameter. Returns info about the encoded image.
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* @param target Contains the address of pixel memory to decode into
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* (which must be large enough to hold the width in info) and
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* the row bytes to use. If NULL, returns info and does not
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* decode pixels.
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* @return bool Whether the function succeeded.
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*
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* Sample usage:
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* <code>
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* // Determine the image's info: width/height/config
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* SkImage::Info info;
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* bool success = DecodeMemoryToTarget(src, size, &info, NULL);
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* if (!success) return;
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* // Allocate space for the result:
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* SkBitmapFactory::Target target;
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* target.fAddr = malloc/other allocation
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* target.fRowBytes = ...
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* // Now decode the actual pixels into target. &info is optional,
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* // and could be NULL
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* success = DecodeMemoryToTarget(src, size, &info, &target);
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* </code>
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*/
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static bool DecodeMemoryToTarget(const void* buffer, size_t size, SkImage::Info* info,
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const SkBitmapFactory::Target* target);
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/** Decode the image stored in the specified SkStream, and store the result
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in bitmap. Return true for success or false on failure.
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@param prefConfig If the PrefConfigTable is not set, prefer this config.
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See NOTE ABOUT PREFERRED CONFIGS.
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@param format On success, if format is non-null, it is set to the format
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of the decoded stream. On failure it is ignored.
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*/
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static bool DecodeStream(SkStream* stream, SkBitmap* bitmap,
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SkBitmap::Config prefConfig, Mode,
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Format* format = NULL);
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static bool DecodeStream(SkStream* stream, SkBitmap* bitmap) {
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return DecodeStream(stream, bitmap, SkBitmap::kNo_Config,
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kDecodePixels_Mode, NULL);
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}
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/** Return the default config for the running device.
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Currently this used as a suggestion to image decoders that need to guess
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what config they should decode into.
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Default is kNo_Config, but this can be changed with SetDeviceConfig()
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*/
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static SkBitmap::Config GetDeviceConfig();
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/** Set the default config for the running device.
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Currently this used as a suggestion to image decoders that need to guess
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what config they should decode into.
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Default is kNo_Config.
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This can be queried with GetDeviceConfig()
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*/
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static void SetDeviceConfig(SkBitmap::Config);
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protected:
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// must be overridden in subclasses. This guy is called by decode(...)
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virtual bool onDecode(SkStream*, SkBitmap* bitmap, Mode) = 0;
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// If the decoder wants to support tiled based decoding,
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// this method must be overridden. This guy is called by buildTileIndex(...)
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virtual bool onBuildTileIndex(SkStream*, int *width, int *height) {
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return false;
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}
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// If the decoder wants to support tiled based decoding,
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// this method must be overridden. This guy is called by decodeRegion(...)
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virtual bool onDecodeSubset(SkBitmap* bitmap, const SkIRect& rect) {
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return false;
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}
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/*
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* Crop a rectangle from the src Bitmap to the dest Bitmap. src and dst are
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* both sampled by sampleSize from an original Bitmap.
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*
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* @param dst the destination bitmap.
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* @param src the source bitmap that is sampled by sampleSize from the
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* original bitmap.
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* @param sampleSize the sample size that src is sampled from the original bitmap.
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* @param (dstX, dstY) the upper-left point of the dest bitmap in terms of
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* the coordinate in the original bitmap.
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* @param (width, height) the width and height of the unsampled dst.
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* @param (srcX, srcY) the upper-left point of the src bitmap in terms of
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* the coordinate in the original bitmap.
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* @return bool Whether or not it succeeded.
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*/
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bool cropBitmap(SkBitmap *dst, SkBitmap *src, int sampleSize,
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int dstX, int dstY, int width, int height,
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int srcX, int srcY);
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/**
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* Copy all fields on this decoder to the other decoder. Used by subclasses
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* to decode a subimage using a different decoder, but with the same settings.
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*/
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void copyFieldsToOther(SkImageDecoder* other);
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/**
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* Return the default preference being used by the current or latest call to
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* decode.
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*/
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SkBitmap::Config getDefaultPref() { return fDefaultPref; }
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/** Can be queried from within onDecode, to see if the user (possibly in
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a different thread) has requested the decode to cancel. If this returns
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true, your onDecode() should stop and return false.
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Each subclass needs to decide how often it can query this, to balance
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responsiveness with performance.
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Calling this outside of onDecode() may return undefined values.
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*/
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public:
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bool shouldCancelDecode() const { return fShouldCancelDecode; }
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protected:
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SkImageDecoder();
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// helper function for decoders to handle the (common) case where there is only
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// once choice available in the image file.
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bool chooseFromOneChoice(SkBitmap::Config config, int width, int height) const;
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/* Helper for subclasses. Call this to allocate the pixel memory given the bitmap's
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width/height/rowbytes/config. Returns true on success. This method handles checking
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for an optional Allocator.
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*/
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bool allocPixelRef(SkBitmap*, SkColorTable*) const;
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/**
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* The raw data of the src image.
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*/
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enum SrcDepth {
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// Color-indexed.
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kIndex_SrcDepth,
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// Grayscale in 8 bits.
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k8BitGray_SrcDepth,
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// 8 bits per component. Used for 24 bit if there is no alpha.
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k32Bit_SrcDepth,
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};
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/** The subclass, inside onDecode(), calls this to determine the config of
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the returned bitmap. SrcDepth and hasAlpha reflect the raw data of the
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src image. This routine returns the caller's preference given
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srcDepth and hasAlpha, or kNo_Config if there is no preference.
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Note: this also takes into account GetDeviceConfig(), so the subclass
|
|
need not call that.
|
|
*/
|
|
SkBitmap::Config getPrefConfig(SrcDepth, bool hasAlpha) const;
|
|
|
|
private:
|
|
Peeker* fPeeker;
|
|
Chooser* fChooser;
|
|
SkBitmap::Allocator* fAllocator;
|
|
int fSampleSize;
|
|
SkBitmap::Config fDefaultPref; // use if fUsePrefTable is false
|
|
PrefConfigTable fPrefTable; // use if fUsePrefTable is true
|
|
bool fDitherImage;
|
|
bool fUsePrefTable;
|
|
mutable bool fShouldCancelDecode;
|
|
bool fPreferQualityOverSpeed;
|
|
bool fRequireUnpremultipliedColors;
|
|
};
|
|
|
|
/** Calling newDecoder with a stream returns a new matching imagedecoder
|
|
instance, or NULL if none can be found. The caller must manage its ownership
|
|
of the stream as usual, calling unref() when it is done, as the returned
|
|
decoder may have called ref() (and if so, the decoder is responsible for
|
|
balancing its ownership when it is destroyed).
|
|
*/
|
|
class SkImageDecoderFactory : public SkRefCnt {
|
|
public:
|
|
SK_DECLARE_INST_COUNT(SkImageDecoderFactory)
|
|
|
|
virtual SkImageDecoder* newDecoder(SkStream*) = 0;
|
|
|
|
private:
|
|
typedef SkRefCnt INHERITED;
|
|
};
|
|
|
|
class SkDefaultImageDecoderFactory : SkImageDecoderFactory {
|
|
public:
|
|
// calls SkImageDecoder::Factory(stream)
|
|
virtual SkImageDecoder* newDecoder(SkStream* stream) {
|
|
return SkImageDecoder::Factory(stream);
|
|
}
|
|
};
|
|
|
|
// This macro declares a global (i.e., non-class owned) creation entry point
|
|
// for each decoder (e.g., CreateJPEGImageDecoder)
|
|
#define DECLARE_DECODER_CREATOR(codec) \
|
|
SkImageDecoder *Create ## codec ();
|
|
|
|
// This macro defines the global creation entry point for each decoder. Each
|
|
// decoder implementation that registers with the decoder factory must call it.
|
|
#define DEFINE_DECODER_CREATOR(codec) \
|
|
SkImageDecoder *Create ## codec () { \
|
|
return SkNEW( Sk ## codec ); \
|
|
}
|
|
|
|
// All the decoders known by Skia. Note that, depending on the compiler settings,
|
|
// not all of these will be available
|
|
DECLARE_DECODER_CREATOR(BMPImageDecoder);
|
|
DECLARE_DECODER_CREATOR(GIFImageDecoder);
|
|
DECLARE_DECODER_CREATOR(ICOImageDecoder);
|
|
DECLARE_DECODER_CREATOR(JPEGImageDecoder);
|
|
DECLARE_DECODER_CREATOR(PNGImageDecoder);
|
|
DECLARE_DECODER_CREATOR(WBMPImageDecoder);
|
|
DECLARE_DECODER_CREATOR(WEBPImageDecoder);
|
|
|
|
#endif
|