Implement helper functionalities for computing image size with ES3 settings.

gpu/command_buffer/common/gles2_cmd_utils_unittest.cc

Index: gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
diff --git a/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc b/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
index 3eb2a3870561a00bf21c429863325852f7178a43..02b30dedcf8965237beb8e1d36cf02e0512fbd51 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
@@ -320,6 +320,71 @@ TEST_F(GLES2UtilTest, ComputeImageDataSizeDepth) {
   EXPECT_EQ(kWidth * 3 + 7, padded_row_size);
 }
 
+TEST_F(GLES2UtilTest, ComputeImageDataSizePixelStoreParams) {
+  const uint32_t kWidth = 3;
+  const uint32_t kHeight = 3;
+  const uint32_t kDepth = 3;
+  uint32_t size;
+  uint32_t unpadded_row_size;
+  uint32_t padded_row_size;
+  uint32_t skip_size;
+
+  {  // Default
+    PixelStoreParams params;
+    EXPECT_TRUE(GLES2Util::ComputeImageDataSizes(
+        kWidth, kHeight, kDepth, GL_RGB, GL_UNSIGNED_BYTE, params,
+        &size, &unpadded_row_size, &padded_row_size, &skip_size));
+    EXPECT_EQ(kWidth * 3, unpadded_row_size);
+    EXPECT_EQ(kWidth * 3 + 3, padded_row_size);
+    EXPECT_EQ(padded_row_size * (kHeight * kDepth - 1) + unpadded_row_size,
+              size);
+    EXPECT_EQ(0u, skip_size);
+  }
+
+  {  // row_length
+    PixelStoreParams params;
+    params.row_length = kWidth + 1;
+    EXPECT_TRUE(GLES2Util::ComputeImageDataSizes(
+        kWidth, kHeight, kDepth, GL_RGB, GL_UNSIGNED_BYTE, params,
+        &size, &unpadded_row_size, &padded_row_size, &skip_size));
+    EXPECT_EQ(static_cast<uint32_t>(kWidth * 3), unpadded_row_size);
+    EXPECT_EQ(static_cast<uint32_t>(params.row_length * 3), padded_row_size);
+    EXPECT_EQ(padded_row_size * (kHeight * kDepth - 1) + unpadded_row_size,
+              size);
+    EXPECT_EQ(0u, skip_size);
+  }
+
+  {  // image_height
+    PixelStoreParams params;
+    params.image_height = kHeight + 1;
+    EXPECT_TRUE(GLES2Util::ComputeImageDataSizes(
+        kWidth, kHeight, kDepth, GL_RGB, GL_UNSIGNED_BYTE, params,
+        &size, &unpadded_row_size, &padded_row_size, &skip_size));
+    EXPECT_EQ(kWidth * 3, unpadded_row_size);
+    EXPECT_EQ(kWidth * 3 + 3, padded_row_size);
+    EXPECT_EQ((params.image_height * (kDepth - 1) + kHeight - 1) *
+              padded_row_size + unpadded_row_size, size);
+    EXPECT_EQ(0u, skip_size);
+  }
+
+  {  // skip_pixels, skip_rows, skip_images

[Ken Russell (switch to Gerrit), 2015/12/09 00:05:50]

Perhaps add another test that also changes the pack alignment to 8 (from the
default of 4) and checks RGBA data with an odd number of pixels, or similar?

[Zhenyao Mo, 2015/12/09 00:27:57]

Done.

+    PixelStoreParams params;
+    params.skip_pixels = 1;
+    params.skip_rows = 10;
+    params.skip_images = 2;
+    EXPECT_TRUE(GLES2Util::ComputeImageDataSizes(
+        kWidth, kHeight, kDepth, GL_RGB, GL_UNSIGNED_BYTE, params,
+        &size, &unpadded_row_size, &padded_row_size, &skip_size));
+    EXPECT_EQ(kWidth * 3, unpadded_row_size);
+    EXPECT_EQ(kWidth * 3 + 3, padded_row_size);
+    EXPECT_EQ(padded_row_size * kHeight * params.skip_images +
+              padded_row_size * params.skip_rows + 3 * params.skip_pixels,
+              skip_size);
+    EXPECT_EQ(padded_row_size * (kWidth * kDepth - 1) + unpadded_row_size,
+              size);
+  }
+}
+
 TEST_F(GLES2UtilTest, RenderbufferBytesPerPixel) {
    EXPECT_EQ(1u, GLES2Util::RenderbufferBytesPerPixel(GL_STENCIL_INDEX8));
    EXPECT_EQ(2u, GLES2Util::RenderbufferBytesPerPixel(GL_RGBA4));