Pull cache out of GrContext

src/gpu/GrTextureProvider.cpp

Index: src/gpu/GrTextureProvider.cpp
diff --git a/src/gpu/GrTextureProvider.cpp b/src/gpu/GrTextureProvider.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c195398917dc828f14c75a7eaa803a94d836db32
--- /dev/null
+++ b/src/gpu/GrTextureProvider.cpp
@@ -0,0 +1,134 @@
+
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrTextureProvider.h"
+#include "GrTexturePriv.h"
+#include "GrResourceCache.h"
+#include "GrGpu.h"
+
+enum ScratchTextureFlags {
+    kExact_ScratchTextureFlag           = 0x1,
+    kNoPendingIO_ScratchTextureFlag     = 0x2,
+    kNoCreate_ScratchTextureFlag        = 0x4,
+};
+
+GrTexture* GrTextureProvider::createTexture(const GrSurfaceDesc& desc, bool budgeted,
+                                            const void* srcData, size_t rowBytes) {
+    if (this->isAbandoned()) {
+        return NULL;
+    }
+    if ((desc.fFlags & kRenderTarget_GrSurfaceFlag) &&
+        !fGpu->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
+        return NULL;
+    }
+    if (!GrPixelConfigIsCompressed(desc.fConfig)) {
+        static const uint32_t kFlags = kExact_ScratchTextureFlag |
+                                       kNoCreate_ScratchTextureFlag;
+        if (GrTexture* texture = this->internalRefScratchTexture(desc, kFlags)) {
+            if (!srcData || texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
+                                                 srcData, rowBytes)) {
+                if (!budgeted) {
+                    texture->resourcePriv().makeUnbudgeted();
+                }
+                return texture;
+            }
+            texture->unref();
+        }
+    }
+    return fGpu->createTexture(desc, budgeted, srcData, rowBytes);
+}
+
+GrTexture* GrTextureProvider::refScratchTexture(const GrSurfaceDesc& desc, ScratchTexMatch match,
+                                                bool calledDuringFlush) {
+    if (this->isAbandoned()) {
+        return NULL;
+    }
+    // Currently we don't recycle compressed textures as scratch.
+    if (GrPixelConfigIsCompressed(desc.fConfig)) {
+        return NULL;
+    } else {
+        uint32_t flags = 0;
+        if (kExact_ScratchTexMatch == match) {
+            flags |= kExact_ScratchTextureFlag;
+        }
+        if (calledDuringFlush) {
+            flags |= kNoPendingIO_ScratchTextureFlag;
+        }
+        return this->internalRefScratchTexture(desc, flags);
+    }
+}
+
+GrTexture* GrTextureProvider::internalRefScratchTexture(const GrSurfaceDesc& inDesc,
+                                                        uint32_t flags) {
+    SkASSERT(!this->isAbandoned());
+    SkASSERT(!GrPixelConfigIsCompressed(inDesc.fConfig));
+
+    SkTCopyOnFirstWrite<GrSurfaceDesc> desc(inDesc);
+
+    if (fGpu->caps()->reuseScratchTextures() || (desc->fFlags & kRenderTarget_GrSurfaceFlag)) {
+        if (!(kExact_ScratchTextureFlag & flags)) {
+            // bin by pow2 with a reasonable min
+            static const int MIN_SIZE = 16;
+            GrSurfaceDesc* wdesc = desc.writable();
+            wdesc->fWidth  = SkTMax(MIN_SIZE, GrNextPow2(desc->fWidth));
+            wdesc->fHeight = SkTMax(MIN_SIZE, GrNextPow2(desc->fHeight));
+        }
+
+        GrScratchKey key;
+        GrTexturePriv::ComputeScratchKey(*desc, &key);
+        uint32_t scratchFlags = 0;
+        if (kNoPendingIO_ScratchTextureFlag & flags) {
+            scratchFlags = GrResourceCache::kRequireNoPendingIO_ScratchFlag;
+        } else  if (!(desc->fFlags & kRenderTarget_GrSurfaceFlag)) {
+            // If it is not a render target then it will most likely be populated by
+            // writePixels() which will trigger a flush if the texture has pending IO.
+            scratchFlags = GrResourceCache::kPreferNoPendingIO_ScratchFlag;
+        }
+        GrGpuResource* resource = fCache->findAndRefScratchResource(key, scratchFlags);
+        if (resource) {
+            GrSurface* surface = static_cast<GrSurface*>(resource);
+            GrRenderTarget* rt = surface->asRenderTarget();
+            if (rt && fGpu->caps()->discardRenderTargetSupport()) {
+                rt->discard();
+            }
+            return surface->asTexture();
+        }
+    }
+
+    if (!(kNoCreate_ScratchTextureFlag & flags)) {
+        return fGpu->createTexture(*desc, true, NULL, 0);
+    }
+
+    return NULL;
+}
+
+GrTexture* GrTextureProvider::wrapBackendTexture(const GrBackendTextureDesc& desc) {
+    if (this->isAbandoned()) {
+        return NULL;
+    }
+    return fGpu->wrapBackendTexture(desc);
+}
+
+GrRenderTarget* GrTextureProvider::wrapBackendRenderTarget(const GrBackendRenderTargetDesc& desc) {
+    return this->isAbandoned() ? NULL : fGpu->wrapBackendRenderTarget(desc);
+}
+
+void GrTextureProvider::assignUniqueKeyToResource(const GrUniqueKey& key, GrGpuResource* resource) {
+    if (this->isAbandoned() || !resource) {
+        return;
+    }
+    resource->resourcePriv().setUniqueKey(key);
+}
+
+bool GrTextureProvider::existsResourceWithUniqueKey(const GrUniqueKey& key) const {
+    return this->isAbandoned() ? false : fCache->hasUniqueKey(key);
+}
+
+GrGpuResource* GrTextureProvider::findAndRefResourceByUniqueKey(const GrUniqueKey& key) {
+    return this->isAbandoned() ? NULL : fCache->findAndRefUniqueResource(key);
+}