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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 "GrResource.h"
class GrRenderTarget;
class GrResourceKey;
class GrSamplerState;
/*
* All uncached textures should have this value as their fClientCacheID
*/
static const uint64_t kUncached_CacheID = 0xAAAAAAAA;
/*
* Scratch textures should all have this value as their fClientCacheID
*/
static const uint64_t kScratch_CacheID = 0xBBBBBBBB;
class GrTexture : public GrResource {
public:
/**
* Retrieves the width of the texture.
*
* @return the width in texels
*/
int width() const { return fDesc.fWidth; }
/**
* Retrieves the height of the texture.
*
* @return the height in texels
*/
int height() const { return fDesc.fHeight; }
/**
* 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;
}
/**
* Retrieves the pixel config specified when the texture was created.
*/
GrPixelConfig config() const { return fDesc.fConfig; }
/**
* Return the descriptor describing the texture
*/
const GrTextureDesc& desc() const { return fDesc; }
/**
* Approximate number of bytes used by the texture
*/
virtual size_t sizeInBytes() const {
return (size_t) fDesc.fWidth *
fDesc.fHeight *
GrBytesPerPixel(fDesc.fConfig);
}
/**
* Read a rectangle of pixels from the texture.
* @param left left edge of the rectangle to read (inclusive)
* @param top top edge of the rectangle to read (inclusive)
* @param width width of rectangle to read in pixels.
* @param height height of rectangle to read in pixels.
* @param config the pixel config of the destination buffer
* @param buffer memory to read the rectangle into.
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*
* @return true if the read succeeded, false if not. The read can fail
* because of a unsupported pixel config.
*/
bool readPixels(int left, int top, int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes);
/**
* Writes a rectangle of pixels to the texture.
* @param left left edge of the rectangle to write (inclusive)
* @param top top edge of the rectangle to write (inclusive)
* @param width width of rectangle to write in pixels.
* @param height height of rectangle to write in pixels.
* @param config the pixel config of the source buffer
* @param buffer memory to read pixels from
* @param rowBytes number of bytes between consecutive rows. Zero
* means rows are tightly packed.
*/
void writePixels(int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes);
/**
* 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
*/
GrRenderTarget* asRenderTarget() { return fRenderTarget; }
const GrRenderTarget* asRenderTarget() const { return fRenderTarget; }
/**
* 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 intptr_t getTextureHandle() const = 0;
#if GR_DEBUG
void validate() const {
this->INHERITED::validate();
this->validateDesc();
}
#else
void validate() const {}
#endif
static GrResourceKey ComputeKey(const GrGpu* gpu,
const GrSamplerState* sampler,
const GrTextureDesc& desc,
bool scratch);
static bool NeedsResizing(const GrResourceKey& key);
static bool IsScratchTexture(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, const GrTextureDesc& desc)
: INHERITED(gpu)
, fRenderTarget(NULL)
, fDesc(desc) {
// only make sense if alloc size is pow2
fShiftFixedX = 31 - Gr_clz(fDesc.fWidth);
fShiftFixedY = 31 - Gr_clz(fDesc.fHeight);
}
// GrResource overrides
virtual void onRelease() {
this->releaseRenderTarget();
}
virtual void onAbandon();
void validateDesc() const;
private:
GrTextureDesc fDesc;
// 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;
typedef GrResource INHERITED;
};
#endif
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