commit a7f69c290667bb969788e014e3308cef6e187740
author Greg Daniel <egdaniel@google.com> Wed Oct 07 13:04:15 2020 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Wed Oct 07 17:58:31 2020 +0000
tree 0f3d6dde5a95ebd315c99f51158df02073ead184
parent c021360a88f98a2c944854d46e92feccd936f3d8

Add stencil formats to all the backends.

Currently there is nothing using these formats, but this change just adds
them along with a quaries about their properties. They will be used in a
follow up change.

Bug: skia:10727
Change-Id: Iaaf13baf372799d47c65bd974fd204a32be57617
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/322622
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

src/gpu/GrBackendUtils.cpp

diff --git a/src/gpu/GrBackendUtils.cpp b/src/gpu/GrBackendUtils.cpp
index b50e574..5b06ea3 100644
--- a/src/gpu/GrBackendUtils.cpp
+++ b/src/gpu/GrBackendUtils.cpp
@@ -137,6 +137,9 @@
             SkImage::CompressionType compression = format.asMockCompressionType();
             if (compression != SkImage::CompressionType::kNone) {
                 return GrCompressedRowBytes(compression, 1);
+            } else if (format.isMockStencilFormat()) {
+                static constexpr int kMockStencilSize = 4;
+                return kMockStencilSize;
             }
             return GrColorTypeBytesPerPixel(format.asMockColorType());
         }
@@ -150,3 +153,52 @@
     }
     return GrBackendFormatBytesPerBlock(format);
 }
+
+int GrBackendFormatStencilBits(const GrBackendFormat& format) {
+    switch (format.backend()) {
+        case GrBackendApi::kOpenGL: {
+#ifdef SK_GL
+            GrGLFormat glFormat = format.asGLFormat();
+            return GrGLFormatStencilBits(glFormat);
+#endif
+            break;
+        }
+        case GrBackendApi::kVulkan: {
+#ifdef SK_VULKAN
+            VkFormat vkFormat;
+            SkAssertResult(format.asVkFormat(&vkFormat));
+            return GrVkFormatStencilBits(vkFormat);
+#endif
+            break;
+        }
+        case GrBackendApi::kMetal: {
+#ifdef SK_METAL
+            return GrMtlBackendFormatStencilBits(format);
+#endif
+            break;
+        }
+        case GrBackendApi::kDirect3D: {
+#ifdef SK_DIRECT3D
+            DXGI_FORMAT dxgiFormat;
+            SkAssertResult(format.asDxgiFormat(&dxgiFormat));
+            return GrDxgiFormatStencilBits(dxgiFormat);
+#endif
+            break;
+        }
+        case GrBackendApi::kDawn: {
+#ifdef SK_DAWN
+            wgpu::TextureFormat dawnFormat;
+            SkAssertResult(format.asDawnFormat(&dawnFormat));
+            return GrDawnFormatStencilBits(dawnFormat);
+#endif
+            break;
+        }
+        case GrBackendApi::kMock: {
+            if (format.isMockStencilFormat()) {
+                static constexpr int kMockStencilBits = 8;
+                return kMockStencilBits;
+            }
+        }
+    }
+    return 0;
+}