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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.
*/
#include "GrTexture.h"
#include "GrContext.h"
#include "GrGpu.h"
#include "GrRenderTarget.h"
#include "GrResourceCache.h"
SK_DEFINE_INST_COUNT(GrTexture)
/**
* 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->isSetFlag((GrTextureFlags) kReturnToCache_FlagBit) &&
NULL != this->INHERITED::getContext()) {
GrTexture* nonConstThis = const_cast<GrTexture *>(this);
this->fRefCnt = 1; // restore ref count to initial setting
nonConstThis->resetFlag((GrTextureFlags) kReturnToCache_FlagBit);
nonConstThis->INHERITED::getContext()->addExistingTextureToCache(nonConstThis);
// Note: "this" texture might be freed inside addExistingTextureToCache
// if it is purged.
return;
}
this->INHERITED::internal_dispose();
}
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::releaseRenderTarget() {
if (NULL != fRenderTarget) {
GrAssert(fRenderTarget->asTexture() == this);
GrAssert(fDesc.fFlags & kRenderTarget_GrTextureFlagBit);
fRenderTarget->onTextureReleaseRenderTarget();
fRenderTarget->unref();
fRenderTarget = NULL;
fDesc.fFlags = fDesc.fFlags &
~(kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit);
fDesc.fSampleCnt = 0;
}
}
void GrTexture::onRelease() {
GrAssert(!this->isSetFlag((GrTextureFlags) kReturnToCache_FlagBit));
this->releaseRenderTarget();
INHERITED::onRelease();
}
void GrTexture::onAbandon() {
if (NULL != fRenderTarget) {
fRenderTarget->abandon();
}
INHERITED::onAbandon();
}
void GrTexture::validateDesc() const {
if (NULL != this->asRenderTarget()) {
// This texture has a render target
GrAssert(0 != (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));
if (NULL != this->asRenderTarget()->getStencilBuffer()) {
GrAssert(0 != (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
} else {
GrAssert(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
}
GrAssert(fDesc.fSampleCnt == this->asRenderTarget()->numSamples());
} else {
GrAssert(0 == (fDesc.fFlags & kRenderTarget_GrTextureFlagBit));
GrAssert(0 == (fDesc.fFlags & kNoStencil_GrTextureFlagBit));
GrAssert(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 kFilter bit can only be set when the kStretchToPOT flag is set and indicates whether the
* stretched texture should be bilerp filtered or point sampled.
*/
kFilter_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->getCaps().npotTextureTileSupport()) {
if (!GrIsPow2(desc.fWidth) || GrIsPow2(desc.fHeight)) {
flags |= kStretchToPOT_TextureFlag;
if (params->isBilerp()) {
flags |= kFilter_TextureFlag;
}
}
}
return flags;
}
GrResourceKey::ResourceType texture_resource_type() {
static const GrResourceKey::ResourceType gType = GrResourceKey::GenerateResourceType();
return gType;
}
}
GrResourceKey GrTexture::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 GrTexture::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) >= 12);
GrAssert(desc.fHeight < (1 << 16));
GrAssert(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;
static const int kPadSize = sizeof(idKey) - 12;
memset(idKey.fData8 + 12, 0, kPadSize);
GrCacheID cacheID(GrResourceKey::ScratchDomain(), idKey);
return GrResourceKey(cacheID, texture_resource_type(), 0);
}
bool GrTexture::NeedsResizing(const GrResourceKey& key) {
return SkToBool(key.getResourceFlags() & kStretchToPOT_TextureFlag);
}
bool GrTexture::NeedsFiltering(const GrResourceKey& key) {
return SkToBool(key.getResourceFlags() & kFilter_TextureFlag);
}
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