Adds a mechanism for GrCacheable objects to notify the resource cache

when their size has changed. GrResourceCacheEntry now holds a
reference to the cache, and a cached value of the resource's most
recent size.

Also utilizes this new functionality for mipmaps, and adds a test for
changing resource sizes.

R=bsalomon@google.com, robertphillips@google.com

Author: cdalton@nvidia.com

Review URL: https://codereview.chromium.org/257093002

git-svn-id: http://skia.googlecode.com/svn/trunk@14576 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 27 insertions, 0 deletions

diff --git a/src/gpu/GrTexture.cpp b/src/gpu/GrTexture.cpp
index f851515371..3186d89d77 100644
--- a/src/gpu/GrTexture.cpp
+++ b/src/gpu/GrTexture.cpp
@@ -44,6 +44,33 @@ void GrTexture::internal_dispose() const {
     this->INHERITED::internal_dispose();
 }
 
+void GrTexture::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 =  (size_t) fDesc.fWidth *
+                                   fDesc.fHeight *
+                                   GrBytesPerPixel(fDesc.fConfig);
+    if (kNotAllocated_MipMapsStatus != fMipMapsStatus) {
+        // 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) {