src/gpu/GrTexture.cpp - skia - Git at Google


 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */


 #include "GrTexture.h"

 #include "GrContext.h"
 #include "GrDrawTargetCaps.h"
 #include "GrGpu.h"
 #include "GrRenderTarget.h"
 #include "GrResourceCache.h"

 GrTexture::~GrTexture() {
     if (NULL != fRenderTarget.get()) {
         fRenderTarget.get()->owningTextureDestroyed();
     }
 }

 /**
  * This method allows us to interrupt the normal deletion process and place
  * textures back in the texture cache when their ref count goes to zero.
  */
 void GrTexture::internal_dispose() const {
     if (this->impl()->isSetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit) &&
         NULL != this->INHERITED::getContext()) {
         GrTexture* nonConstThis = const_cast<GrTexture *>(this);
         this->ref(); // restore ref count to initial setting

         nonConstThis->impl()->resetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit);
         nonConstThis->INHERITED::getContext()->addExistingTextureToCache(nonConstThis);

         // Note: "this" texture might be freed inside addExistingTextureToCache
         // if it is purged.
         return;
     }

     this->INHERITED::internal_dispose();
 }

 void GrTextureImpl::dirtyMipMaps(bool mipMapsDirty) {
     if (mipMapsDirty) {
         if (kValid_MipMapsStatus == fMipMapsStatus) {
             fMipMapsStatus = kAllocated_MipMapsStatus;
         }
     } else {
         const bool sizeChanged = kNotAllocated_MipMapsStatus == fMipMapsStatus;
         fMipMapsStatus = kValid_MipMapsStatus;
         if (sizeChanged) {
             // This must not be called until after changing fMipMapsStatus.
             this->didChangeGpuMemorySize();
         }
     }
 }

 size_t GrTexture::gpuMemorySize() const {
     size_t textureSize;

     if (GrPixelConfigIsCompressed(fDesc.fConfig)) {
         textureSize = GrCompressedFormatDataSize(fDesc.fConfig, fDesc.fWidth, fDesc.fHeight);
     } else {
         textureSize = (size_t) fDesc.fWidth * fDesc.fHeight * GrBytesPerPixel(fDesc.fConfig);
     }

     if (this->impl()->hasMipMaps()) {
         // We don't have to worry about the mipmaps being a different size than
         // we'd expect because we never change fDesc.fWidth/fHeight.
         textureSize *= 2;
     }
     return textureSize;
 }

 bool GrTexture::readPixels(int left, int top, int width, int height,
                            GrPixelConfig config, void* buffer,
                            size_t rowBytes, uint32_t pixelOpsFlags) {
     // go through context so that all necessary flushing occurs
     GrContext* context = this->getContext();
     if (NULL == context) {
         return false;
     }
     return context->readTexturePixels(this,
                                       left, top, width, height,
                                       config, buffer, rowBytes,
                                       pixelOpsFlags);
 }

 void GrTexture::writePixels(int left, int top, int width, int height,
                             GrPixelConfig config, const void* buffer,
                             size_t rowBytes, uint32_t pixelOpsFlags) {
     // go through context so that all necessary flushing occurs
     GrContext* context = this->getContext();
     if (NULL == context) {
         return;
     }
     context->writeTexturePixels(this,
                                 left, top, width, height,
                                 config, buffer, rowBytes,
                                 pixelOpsFlags);
 }

 void GrTexture::abandonReleaseCommon() {
     // In debug builds the resource cache tracks removed/exclusive textures and has an unref'ed ptr.
     // After abandon() or release() the resource cache will be unreachable (getContext() == NULL).
     // So we readd the texture to the cache here so that it is removed from the exclusive list and
     // there is no longer an unref'ed ptr to the texture in the cache.
     if (this->impl()->isSetFlag((GrTextureFlags)GrTextureImpl::kReturnToCache_FlagBit)) {
         SkASSERT(!this->wasDestroyed());
         this->ref();  // restores the ref the resource cache gave up when it marked this exclusive.
         this->impl()->resetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit);
         this->getContext()->addExistingTextureToCache(this);
     }
 }

 void GrTexture::onRelease() {
     this->abandonReleaseCommon();
     SkASSERT(!this->impl()->isSetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit));
     INHERITED::onRelease();
 }

 void GrTexture::onAbandon() {
     this->abandonReleaseCommon();
     if (NULL != fRenderTarget.get()) {
         fRenderTarget->abandon();
     }
     INHERITED::onAbandon();
 }

 void GrTexture::validateDesc() const {
     if (NULL != this->asRenderTarget()) {
         // This texture has a render target
         SkASSERT(0 != (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));

         if (NULL != this->asRenderTarget()->getStencilBuffer()) {
             SkASSERT(0 != (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
         } else {
             SkASSERT(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
         }

         SkASSERT(fDesc.fSampleCnt == this->asRenderTarget()->numSamples());
     } else {
         SkASSERT(0 == (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));
         SkASSERT(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
         SkASSERT(0 == fDesc.fSampleCnt);
     }
 }

 //////////////////////////////////////////////////////////////////////////////

 // These flags need to fit in a GrResourceKey::ResourceFlags so they can be folded into the texture
 // key
 enum TextureFlags {
     /**
      * The kStretchToPOT bit is set when the texture is NPOT and is being repeated but the
      * hardware doesn't support that feature.
      */
     kStretchToPOT_TextureFlag = 0x1,
     /**
      * The kBilerp bit can only be set when the kStretchToPOT flag is set and indicates whether the
      * stretched texture should be bilerped.
      */
      kBilerp_TextureFlag       = 0x2,
 };

 namespace {
 GrResourceKey::ResourceFlags get_texture_flags(const GrGpu* gpu,
                                                const GrTextureParams* params,
                                                const GrTextureDesc& desc) {
     GrResourceKey::ResourceFlags flags = 0;
     bool tiled = NULL != params && params->isTiled();
     if (tiled && !gpu->caps()->npotTextureTileSupport()) {
         if (!SkIsPow2(desc.fWidth) || !SkIsPow2(desc.fHeight)) {
             flags |= kStretchToPOT_TextureFlag;
             switch(params->filterMode()) {
                 case GrTextureParams::kNone_FilterMode:
                     break;
                 case GrTextureParams::kBilerp_FilterMode:
                 case GrTextureParams::kMipMap_FilterMode:
                     flags |= kBilerp_TextureFlag;
                     break;
             }
         }
     }
     return flags;
 }

 GrResourceKey::ResourceType texture_resource_type() {
     static const GrResourceKey::ResourceType gType = GrResourceKey::GenerateResourceType();
     return gType;
 }

 // FIXME:  This should be refactored with the code in gl/GrGpuGL.cpp.
 GrSurfaceOrigin resolve_origin(const GrTextureDesc& desc) {
     // By default, GrRenderTargets are GL's normal orientation so that they
     // can be drawn to by the outside world without the client having
     // to render upside down.
     bool renderTarget = 0 != (desc.fFlags & kRenderTarget_GrTextureFlagBit);
     if (kDefault_GrSurfaceOrigin == desc.fOrigin) {
         return renderTarget ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
     } else {
         return desc.fOrigin;
     }
 }
 }

 //////////////////////////////////////////////////////////////////////////////

 GrResourceKey GrTextureImpl::ComputeKey(const GrGpu* gpu,
                                     const GrTextureParams* params,
                                     const GrTextureDesc& desc,
                                     const GrCacheID& cacheID) {
     GrResourceKey::ResourceFlags flags = get_texture_flags(gpu, params, desc);
     return GrResourceKey(cacheID, texture_resource_type(), flags);
 }

 GrResourceKey GrTextureImpl::ComputeScratchKey(const GrTextureDesc& desc) {
     GrCacheID::Key idKey;
     // Instead of a client-provided key of the texture contents we create a key from the
     // descriptor.
     GR_STATIC_ASSERT(sizeof(idKey) >= 16);
     SkASSERT(desc.fHeight < (1 << 16));
     SkASSERT(desc.fWidth < (1 << 16));
     idKey.fData32[0] = (desc.fWidth) | (desc.fHeight << 16);
     idKey.fData32[1] = desc.fConfig | desc.fSampleCnt << 16;
     idKey.fData32[2] = desc.fFlags;
     idKey.fData32[3] = resolve_origin(desc);    // Only needs 2 bits actually
     static const int kPadSize = sizeof(idKey) - 16;
     GR_STATIC_ASSERT(kPadSize >= 0);
     memset(idKey.fData8 + 16, 0, kPadSize);

     GrCacheID cacheID(GrResourceKey::ScratchDomain(), idKey);
     return GrResourceKey(cacheID, texture_resource_type(), 0);
 }

 bool GrTextureImpl::NeedsResizing(const GrResourceKey& key) {
     return SkToBool(key.getResourceFlags() & kStretchToPOT_TextureFlag);
 }

 bool GrTextureImpl::NeedsBilerp(const GrResourceKey& key) {
     return SkToBool(key.getResourceFlags() & kBilerp_TextureFlag);
 }

	/*
	* Copyright 2011 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/


	#include "GrTexture.h"

	#include "GrContext.h"
	#include "GrDrawTargetCaps.h"
	#include "GrGpu.h"
	#include "GrRenderTarget.h"
	#include "GrResourceCache.h"

	GrTexture::~GrTexture() {
	if (NULL != fRenderTarget.get()) {
	fRenderTarget.get()->owningTextureDestroyed();
	}
	}

	/**
	* This method allows us to interrupt the normal deletion process and place
	* textures back in the texture cache when their ref count goes to zero.
	*/
	void GrTexture::internal_dispose() const {
	if (this->impl()->isSetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit) &&
	NULL != this->INHERITED::getContext()) {
	GrTexture* nonConstThis = const_cast<GrTexture *>(this);
	this->ref(); // restore ref count to initial setting

	nonConstThis->impl()->resetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit);
	nonConstThis->INHERITED::getContext()->addExistingTextureToCache(nonConstThis);

	// Note: "this" texture might be freed inside addExistingTextureToCache
	// if it is purged.
	return;
	}

	this->INHERITED::internal_dispose();
	}

	void GrTextureImpl::dirtyMipMaps(bool mipMapsDirty) {
	if (mipMapsDirty) {
	if (kValid_MipMapsStatus == fMipMapsStatus) {
	fMipMapsStatus = kAllocated_MipMapsStatus;
	}
	} else {
	const bool sizeChanged = kNotAllocated_MipMapsStatus == fMipMapsStatus;
	fMipMapsStatus = kValid_MipMapsStatus;
	if (sizeChanged) {
	// This must not be called until after changing fMipMapsStatus.
	this->didChangeGpuMemorySize();
	}
	}
	}

	size_t GrTexture::gpuMemorySize() const {
	size_t textureSize;

	if (GrPixelConfigIsCompressed(fDesc.fConfig)) {
	textureSize = GrCompressedFormatDataSize(fDesc.fConfig, fDesc.fWidth, fDesc.fHeight);
	} else {
	textureSize = (size_t) fDesc.fWidth * fDesc.fHeight * GrBytesPerPixel(fDesc.fConfig);
	}

	if (this->impl()->hasMipMaps()) {
	// We don't have to worry about the mipmaps being a different size than
	// we'd expect because we never change fDesc.fWidth/fHeight.
	textureSize *= 2;
	}
	return textureSize;
	}

	bool GrTexture::readPixels(int left, int top, int width, int height,
	GrPixelConfig config, void* buffer,
	size_t rowBytes, uint32_t pixelOpsFlags) {
	// go through context so that all necessary flushing occurs
	GrContext* context = this->getContext();
	if (NULL == context) {
	return false;
	}
	return context->readTexturePixels(this,
	left, top, width, height,
	config, buffer, rowBytes,
	pixelOpsFlags);
	}

	void GrTexture::writePixels(int left, int top, int width, int height,
	GrPixelConfig config, const void* buffer,
	size_t rowBytes, uint32_t pixelOpsFlags) {
	// go through context so that all necessary flushing occurs
	GrContext* context = this->getContext();
	if (NULL == context) {
	return;
	}
	context->writeTexturePixels(this,
	left, top, width, height,
	config, buffer, rowBytes,
	pixelOpsFlags);
	}

	void GrTexture::abandonReleaseCommon() {
	// In debug builds the resource cache tracks removed/exclusive textures and has an unref'ed ptr.
	// After abandon() or release() the resource cache will be unreachable (getContext() == NULL).
	// So we readd the texture to the cache here so that it is removed from the exclusive list and
	// there is no longer an unref'ed ptr to the texture in the cache.
	if (this->impl()->isSetFlag((GrTextureFlags)GrTextureImpl::kReturnToCache_FlagBit)) {
	SkASSERT(!this->wasDestroyed());
	this->ref(); // restores the ref the resource cache gave up when it marked this exclusive.
	this->impl()->resetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit);
	this->getContext()->addExistingTextureToCache(this);
	}
	}

	void GrTexture::onRelease() {
	this->abandonReleaseCommon();
	SkASSERT(!this->impl()->isSetFlag((GrTextureFlags) GrTextureImpl::kReturnToCache_FlagBit));
	INHERITED::onRelease();
	}

	void GrTexture::onAbandon() {
	this->abandonReleaseCommon();
	if (NULL != fRenderTarget.get()) {
	fRenderTarget->abandon();
	}
	INHERITED::onAbandon();
	}

	void GrTexture::validateDesc() const {
	if (NULL != this->asRenderTarget()) {
	// This texture has a render target
	SkASSERT(0 != (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));

	if (NULL != this->asRenderTarget()->getStencilBuffer()) {
	SkASSERT(0 != (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
	} else {
	SkASSERT(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
	}

	SkASSERT(fDesc.fSampleCnt == this->asRenderTarget()->numSamples());
	} else {
	SkASSERT(0 == (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));
	SkASSERT(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
	SkASSERT(0 == fDesc.fSampleCnt);
	}
	}

	//////////////////////////////////////////////////////////////////////////////

	// These flags need to fit in a GrResourceKey::ResourceFlags so they can be folded into the texture
	// key
	enum TextureFlags {
	/**
	* The kStretchToPOT bit is set when the texture is NPOT and is being repeated but the
	* hardware doesn't support that feature.
	*/
	kStretchToPOT_TextureFlag = 0x1,
	/**
	* The kBilerp bit can only be set when the kStretchToPOT flag is set and indicates whether the
	* stretched texture should be bilerped.
	*/
	kBilerp_TextureFlag = 0x2,
	};

	namespace {
	GrResourceKey::ResourceFlags get_texture_flags(const GrGpu* gpu,
	const GrTextureParams* params,
	const GrTextureDesc& desc) {
	GrResourceKey::ResourceFlags flags = 0;
	bool tiled = NULL != params && params->isTiled();
	if (tiled && !gpu->caps()->npotTextureTileSupport()) {
	if (!SkIsPow2(desc.fWidth) \|\| !SkIsPow2(desc.fHeight)) {
	flags \|= kStretchToPOT_TextureFlag;
	switch(params->filterMode()) {
	case GrTextureParams::kNone_FilterMode:
	break;
	case GrTextureParams::kBilerp_FilterMode:
	case GrTextureParams::kMipMap_FilterMode:
	flags \|= kBilerp_TextureFlag;
	break;
	}
	}
	}
	return flags;
	}

	GrResourceKey::ResourceType texture_resource_type() {
	static const GrResourceKey::ResourceType gType = GrResourceKey::GenerateResourceType();
	return gType;
	}

	// FIXME: This should be refactored with the code in gl/GrGpuGL.cpp.
	GrSurfaceOrigin resolve_origin(const GrTextureDesc& desc) {
	// By default, GrRenderTargets are GL's normal orientation so that they
	// can be drawn to by the outside world without the client having
	// to render upside down.
	bool renderTarget = 0 != (desc.fFlags & kRenderTarget_GrTextureFlagBit);
	if (kDefault_GrSurfaceOrigin == desc.fOrigin) {
	return renderTarget ? kBottomLeft_GrSurfaceOrigin : kTopLeft_GrSurfaceOrigin;
	} else {
	return desc.fOrigin;
	}
	}
	}

	//////////////////////////////////////////////////////////////////////////////

	GrResourceKey GrTextureImpl::ComputeKey(const GrGpu* gpu,
	const GrTextureParams* params,
	const GrTextureDesc& desc,
	const GrCacheID& cacheID) {
	GrResourceKey::ResourceFlags flags = get_texture_flags(gpu, params, desc);
	return GrResourceKey(cacheID, texture_resource_type(), flags);
	}

	GrResourceKey GrTextureImpl::ComputeScratchKey(const GrTextureDesc& desc) {
	GrCacheID::Key idKey;
	// Instead of a client-provided key of the texture contents we create a key from the
	// descriptor.
	GR_STATIC_ASSERT(sizeof(idKey) >= 16);
	SkASSERT(desc.fHeight < (1 << 16));
	SkASSERT(desc.fWidth < (1 << 16));
	idKey.fData32[0] = (desc.fWidth) \| (desc.fHeight << 16);
	idKey.fData32[1] = desc.fConfig \| desc.fSampleCnt << 16;
	idKey.fData32[2] = desc.fFlags;
	idKey.fData32[3] = resolve_origin(desc); // Only needs 2 bits actually
	static const int kPadSize = sizeof(idKey) - 16;
	GR_STATIC_ASSERT(kPadSize >= 0);
	memset(idKey.fData8 + 16, 0, kPadSize);

	GrCacheID cacheID(GrResourceKey::ScratchDomain(), idKey);
	return GrResourceKey(cacheID, texture_resource_type(), 0);
	}

	bool GrTextureImpl::NeedsResizing(const GrResourceKey& key) {
	return SkToBool(key.getResourceFlags() & kStretchToPOT_TextureFlag);
	}

	bool GrTextureImpl::NeedsBilerp(const GrResourceKey& key) {
	return SkToBool(key.getResourceFlags() & kBilerp_TextureFlag);
	}