[angle] Cherry-pick compressed tex depth stride fix.RELBASE_20210205

1 files changed, 12 insertions, 3 deletions

diff --git a/gfx/angle/src/libANGLE/formatutils.cpp b/gfx/angle/src/libANGLE/formatutils.cpp
index 9a8c1b790..caeaf6c6e 100755
--- a/gfx/angle/src/libANGLE/formatutils.cpp
+++ b/gfx/angle/src/libANGLE/formatutils.cpp
@@ -863,13 +863,22 @@ gl::ErrorOrResult<GLuint> InternalFormat::computeDepthPitch(GLenum formatType,
                                                             GLint rowLength,
                                                             GLint imageHeight) const
 {
-    GLuint rows =
-        (imageHeight > 0 ? static_cast<GLuint>(imageHeight) : static_cast<GLuint>(height));
+    CheckedNumeric<GLuint> pixelsHeight(imageHeight > 0 ? static_cast<GLuint>(imageHeight)
+                                                        : static_cast<GLuint>(height));
+
+    CheckedNumeric<GLuint> rowCount;
+    if (compressed) {
+        CheckedNumeric<GLuint> checkedBlockHeight(compressedBlockHeight);
+        rowCount = (pixelsHeight + checkedBlockHeight - 1u) / checkedBlockHeight;
+    } else {
+        rowCount = pixelsHeight;
+    }
+
     GLuint rowPitch = 0;
     ANGLE_TRY_RESULT(computeRowPitch(formatType, width, alignment, rowLength), rowPitch);
 
     CheckedNumeric<GLuint> checkedRowPitch(rowPitch);
-    auto depthPitch = checkedRowPitch * rows;
+    auto depthPitch = checkedRowPitch * rowCount;
     ANGLE_TRY_CHECKED_MATH(depthPitch);
     return depthPitch.ValueOrDie();
 }