mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/*
|
|
* 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 GrTextureAccess_DEFINED
|
|
#define GrTextureAccess_DEFINED
|
|
|
|
#include "GrNoncopyable.h"
|
|
#include "SkRefCnt.h"
|
|
|
|
class GrTexture;
|
|
|
|
/** A class representing the swizzle access pattern for a texture. Note that if the texture is
|
|
* an alpha-only texture then the alpha channel is substituted for other components. Any mangling
|
|
* to handle the r,g,b->a conversions for alpha textures is automatically included in the stage
|
|
* key. However, if a GrCustomStage uses different swizzles based on its input then it must
|
|
* consider that variation in its key-generation.
|
|
*/
|
|
class GrTextureAccess : GrNoncopyable {
|
|
public:
|
|
/**
|
|
* A default GrTextureAccess must have reset() called on it in a GrCustomStage subclass's
|
|
* constructor if it will be accessible via GrCustomStage::textureAccess().
|
|
*/
|
|
GrTextureAccess();
|
|
|
|
/**
|
|
* swizzle must be a string between one and four (inclusive) characters containing only 'r',
|
|
* 'g', 'b', and/or 'a'.
|
|
*/
|
|
GrTextureAccess(GrTexture*, const char* swizzle);
|
|
|
|
/**
|
|
* Uses the default swizzle, "rgba".
|
|
*/
|
|
GrTextureAccess(GrTexture*);
|
|
|
|
void reset(GrTexture*, const char* swizzle);
|
|
void reset(GrTexture*);
|
|
|
|
GrTexture* getTexture() const { return fTexture.get(); }
|
|
|
|
/**
|
|
* Returns a string representing the swizzle. The string is is null-terminated.
|
|
*/
|
|
const char* getSwizzle() const { return fSwizzle; }
|
|
|
|
enum {
|
|
kR_SwizzleFlag = 0x1,
|
|
kG_SwizzleFlag = 0x2,
|
|
kB_SwizzleFlag = 0x4,
|
|
kA_SwizzleFlag = 0x8,
|
|
|
|
kRGB_SwizzleMask = (kR_SwizzleFlag | kG_SwizzleFlag | kB_SwizzleFlag),
|
|
};
|
|
|
|
/** Returns a mask indicating which components are referenced in the swizzle. */
|
|
uint32_t swizzleMask() const { return fSwizzleMask; }
|
|
|
|
private:
|
|
SkAutoTUnref<GrTexture> fTexture;
|
|
uint32_t fSwizzleMask;
|
|
char fSwizzle[5];
|
|
};
|
|
|
|
#endif
|