Rename GrStencilBuffer to GrStencilAttachment

BUG=skia:

Review URL: https://codereview.chromium.org/1083133002

1 files changed, 81 insertions, 0 deletions

diff --git a/src/gpu/GrStencilAttachment.h b/src/gpu/GrStencilAttachment.h
new file mode 100644
index 0000000000..ba9781d4ce
--- /dev/null
+++ b/src/gpu/GrStencilAttachment.h
@@ -0,0 +1,81 @@
+
+/*
+ * 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 GrStencilAttachment_DEFINED
+#define GrStencilAttachment_DEFINED
+
+#include "GrClip.h"
+#include "GrGpuResource.h"
+
+class GrRenderTarget;
+class GrResourceKey;
+
+class GrStencilAttachment : public GrGpuResource {
+public:
+    SK_DECLARE_INST_COUNT(GrStencilAttachment);
+
+    virtual ~GrStencilAttachment() {
+        // TODO: allow SB to be purged and detach itself from rts
+    }
+
+    int width() const { return fWidth; }
+    int height() const { return fHeight; }
+    int bits() const { return fBits; }
+    int numSamples() const { return fSampleCnt; }
+
+    // called to note the last clip drawn to this buffer.
+    void setLastClip(int32_t clipStackGenID,
+                     const SkIRect& clipSpaceRect,
+                     const SkIPoint clipSpaceToStencilOffset) {
+        fLastClipStackGenID = clipStackGenID;
+        fLastClipStackRect = clipSpaceRect;
+        fLastClipSpaceOffset = clipSpaceToStencilOffset;
+    }
+
+    // called to determine if we have to render the clip into SB.
+    bool mustRenderClip(int32_t clipStackGenID,
+                        const SkIRect& clipSpaceRect,
+                        const SkIPoint clipSpaceToStencilOffset) const {
+        return fLastClipStackGenID != clipStackGenID ||
+               fLastClipSpaceOffset != clipSpaceToStencilOffset ||
+               !fLastClipStackRect.contains(clipSpaceRect);
+    }
+
+    // We create a unique stencil buffer at each width, height and sampleCnt and share it for
+    // all render targets that require a stencil with those params.
+    static void ComputeSharedStencilAttachmentKey(int width, int height, int sampleCnt,
+                                                  GrUniqueKey* key);
+
+protected:
+    GrStencilAttachment(GrGpu* gpu, LifeCycle lifeCycle, int width, int height, int bits,
+                        int sampleCnt)
+        : GrGpuResource(gpu, lifeCycle)
+        , fWidth(width)
+        , fHeight(height)
+        , fBits(bits)
+        , fSampleCnt(sampleCnt)
+        , fLastClipStackGenID(SkClipStack::kInvalidGenID) {
+        fLastClipStackRect.setEmpty();
+    }
+
+private:
+
+    int fWidth;
+    int fHeight;
+    int fBits;
+    int fSampleCnt;
+
+    int32_t     fLastClipStackGenID;
+    SkIRect     fLastClipStackRect;
+    SkIPoint    fLastClipSpaceOffset;
+
+    typedef GrGpuResource INHERITED;
+};
+
+#endif