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Unified Diff: src/effects/SkGpuBlurUtils.h

Issue 2266063002: Revert of Moving SkBlurImageFilter into core (Closed) Base URL: https://skia.googlesource.com/skia@master
Patch Set: Created 4 years, 4 months ago
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Index: src/effects/SkGpuBlurUtils.h
diff --git a/src/effects/SkGpuBlurUtils.h b/src/effects/SkGpuBlurUtils.h
new file mode 100644
index 0000000000000000000000000000000000000000..a12a08873c3a4c8bac439a9b97120fd1d0546388
--- /dev/null
+++ b/src/effects/SkGpuBlurUtils.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkGpuBlurUtils_DEFINED
+#define SkGpuBlurUtils_DEFINED
+
+#if SK_SUPPORT_GPU
+#include "GrDrawContext.h"
+
+class GrContext;
+class GrTexture;
+
+struct SkRect;
+
+namespace SkGpuBlurUtils {
+ /**
+ * Applies a 2D Gaussian blur to a given texture. The blurred result is returned
+ * as a drawContext in case the caller wishes to future draw into the result.
+ * Note: one of sigmaX and sigmaY should be non-zero!
+ * @param context The GPU context
+ * @param srcTexture The source texture to be blurred.
+ * @param colorSpace Color space of the source (used for the drawContext result, too).
+ * @param dstBounds The destination bounds, relative to the source texture.
+ * @param srcBounds The source bounds, relative to the source texture. If non-null,
+ * no pixels will be sampled outside of this rectangle.
+ * @param sigmaX The blur's standard deviation in X.
+ * @param sigmaY The blur's standard deviation in Y.
+ * @param fit backing fit for the returned draw context
+ * @return The drawContext containing the blurred result.
+ */
+ sk_sp<GrDrawContext> GaussianBlur(GrContext* context,
+ GrTexture* srcTexture,
+ sk_sp<SkColorSpace> colorSpace,
+ const SkIRect& dstBounds,
+ const SkIRect* srcBounds,
+ float sigmaX,
+ float sigmaY,
+ SkBackingFit fit = SkBackingFit::kApprox);
+};
+
+#endif
+#endif
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