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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrTexture_DEFINED
#define GrTexture_DEFINED
#include "GrSurface.h"
class GrRenderTarget;
class GrResourceKey;
class GrTextureParams;
class GrTexture : public GrSurface {
public:
SK_DECLARE_INST_COUNT(GrTexture)
// from GrResource
/**
* Informational texture flags
*/
enum FlagBits {
kFirstBit = (kLastPublic_GrTextureFlagBit << 1),
/**
* This texture should be returned to the texture cache when
* it is no longer reffed
*/
kReturnToCache_FlagBit = kFirstBit,
};
void setFlag(GrTextureFlags flags) {
fDesc.fFlags = fDesc.fFlags | flags;
}
void resetFlag(GrTextureFlags flags) {
fDesc.fFlags = fDesc.fFlags & ~flags;
}
bool isSetFlag(GrTextureFlags flags) const {
return 0 != (fDesc.fFlags & flags);
}
/**
* Approximate number of bytes used by the texture
*/
virtual size_t sizeInBytes() const SK_OVERRIDE {
return (size_t) fDesc.fWidth *
fDesc.fHeight *
GrBytesPerPixel(fDesc.fConfig);
}
// GrSurface overrides
virtual bool readPixels(int left, int top, int width, int height,
GrPixelConfig config,
void* buffer,
size_t rowBytes = 0,
uint32_t pixelOpsFlags = 0) SK_OVERRIDE;
virtual void writePixels(int left, int top, int width, int height,
GrPixelConfig config,
const void* buffer,
size_t rowBytes = 0,
uint32_t pixelOpsFlags = 0) SK_OVERRIDE;
/**
* @return this texture
*/
virtual GrTexture* asTexture() SK_OVERRIDE { return this; }
virtual const GrTexture* asTexture() const SK_OVERRIDE { return this; }
/**
* Retrieves the render target underlying this texture that can be passed to
* GrGpu::setRenderTarget().
*
* @return handle to render target or NULL if the texture is not a
* render target
*/
virtual GrRenderTarget* asRenderTarget() SK_OVERRIDE {
return fRenderTarget;
}
virtual const GrRenderTarget* asRenderTarget() const SK_OVERRIDE {
return fRenderTarget;
}
// GrTexture
/**
* Convert from texels to normalized texture coords for POT textures
* only.
*/
GrFixed normalizeFixedX(GrFixed x) const {
GrAssert(GrIsPow2(fDesc.fWidth));
return x >> fShiftFixedX;
}
GrFixed normalizeFixedY(GrFixed y) const {
GrAssert(GrIsPow2(fDesc.fHeight));
return y >> fShiftFixedY;
}
/**
* Removes the reference on the associated GrRenderTarget held by this
* texture. Afterwards asRenderTarget() will return NULL. The
* GrRenderTarget survives the release if another ref is held on it.
*/
void releaseRenderTarget();
/**
* Return the native ID or handle to the texture, depending on the
* platform. e.g. on OpenGL, return the texture ID.
*/
virtual GrBackendObject getTextureHandle() const = 0;
/**
* Call this when the state of the native API texture object is
* altered directly, without being tracked by skia.
*/
virtual void invalidateCachedState() = 0;
#if GR_DEBUG
void validate() const {
this->INHERITED::validate();
this->validateDesc();
}
#else
void validate() const {}
#endif
static GrResourceKey ComputeKey(const GrGpu* gpu,
const GrTextureParams* params,
const GrTextureDesc& desc,
const GrCacheID& cacheID);
static GrResourceKey ComputeScratchKey(const GrTextureDesc& desc);
static bool NeedsResizing(const GrResourceKey& key);
static bool NeedsFiltering(const GrResourceKey& key);
protected:
GrRenderTarget* fRenderTarget; // texture refs its rt representation
// base class cons sets to NULL
// subclass cons can create and set
GrTexture(GrGpu* gpu, bool isWrapped, const GrTextureDesc& desc, Origin origin)
: INHERITED(gpu, isWrapped, desc, origin)
, fRenderTarget(NULL) {
// only make sense if alloc size is pow2
fShiftFixedX = 31 - SkCLZ(fDesc.fWidth);
fShiftFixedY = 31 - SkCLZ(fDesc.fHeight);
}
// GrResource overrides
virtual void onRelease() SK_OVERRIDE;
virtual void onAbandon() SK_OVERRIDE;
void validateDesc() const;
private:
// these two shift a fixed-point value into normalized coordinates
// for this texture if the texture is power of two sized.
int fShiftFixedX;
int fShiftFixedY;
virtual void internal_dispose() const SK_OVERRIDE;
typedef GrSurface INHERITED;
};
#endif
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