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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkImage_DEFINED
#define SkImage_DEFINED
#include "SkAlpha.h"
#include "SkImageEncoder.h"
#include "SkRefCnt.h"
#include "SkScalar.h"
class SkData;
class SkCanvas;
class SkPaint;
class SkShader;
class GrContext;
class GrTexture;
// need for TileMode
#include "SkShader.h"
/**
* SkImage is an abstraction for drawing a rectagle of pixels, though the
* particular type of image could be actually storing its data on the GPU, or
* as drawing commands (picture or PDF or otherwise), ready to be played back
* into another canvas.
*
* The content of SkImage is always immutable, though the actual storage may
* change, if for example that image can be re-created via encoded data or
* other means.
*/
class SK_API SkImage : public SkRefCnt {
public:
SK_DECLARE_INST_COUNT(SkImage)
enum ColorType {
kAlpha_8_ColorType,
kRGB_565_ColorType,
kRGBA_8888_ColorType,
kBGRA_8888_ColorType,
#if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
kPMColor_ColorType = kBGRA_8888_ColorType,
#elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
kPMColor_ColorType = kRGBA_8888_ColorType,
#else
#error "SK_*32_SHFIT values must correspond to BGRA or RGBA byte order"
#endif
kLastEnum_ColorType = kBGRA_8888_ColorType
};
#ifdef SK_ENABLE_LEGACY_API_ALIASING
enum AlphaType {
kIgnore_AlphaType = kIgnore_SkAlphaType,
kOpaque_AlphaType = kOpaque_SkAlphaType,
kPremul_AlphaType = kPremul_SkAlphaType,
kUnpremul_AlphaType = kUnpremul_SkAlphaType,
};
#endif
struct Info {
int fWidth;
int fHeight;
ColorType fColorType;
SkAlphaType fAlphaType;
};
static SkImage* NewRasterCopy(const Info&, const void* pixels, size_t rowBytes);
static SkImage* NewRasterData(const Info&, SkData* pixels, size_t rowBytes);
static SkImage* NewEncodedData(SkData*);
/**
* GrTexture is a more logical parameter for this factory, but its
* interactions with scratch cache still has issues, so for now we take
* SkBitmap instead. This will be changed in the future. skbug.com/1449
*/
static SkImage* NewTexture(const SkBitmap&);
int width() const { return fWidth; }
int height() const { return fHeight; }
uint32_t uniqueID() const { return fUniqueID; }
/**
* Return the GrTexture that stores the image pixels. Calling getTexture
* does not affect the reference count of the GrTexture object.
* Will return NULL if the image does not use a texture.
*/
GrTexture* getTexture();
SkShader* newShaderClamp() const;
SkShader* newShader(SkShader::TileMode, SkShader::TileMode) const;
void draw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*);
/**
* Draw the image, cropped to the src rect, to the dst rect of a canvas.
* If src is larger than the bounds of the image, the rest of the image is
* filled with transparent black pixels.
*
* See SkCanvas::drawBitmapRectToRect for similar behavior.
*/
void draw(SkCanvas*, const SkRect* src, const SkRect& dst, const SkPaint*);
/**
* Encode the image's pixels and return the result as a new SkData, which
* the caller must manage (i.e. call unref() when they are done).
*
* If the image type cannot be encoded, or the requested encoder type is
* not supported, this will return NULL.
*/
SkData* encode(SkImageEncoder::Type t = SkImageEncoder::kPNG_Type,
int quality = 80) const;
protected:
SkImage(int width, int height) :
fWidth(width),
fHeight(height),
fUniqueID(NextUniqueID()) {
SkASSERT(width >= 0);
SkASSERT(height >= 0);
}
private:
const int fWidth;
const int fHeight;
const uint32_t fUniqueID;
static uint32_t NextUniqueID();
typedef SkRefCnt INHERITED;
};
#endif
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