implemented metal gpu backend texture upload testing

Bug: skia:
Change-Id: Ia3af58a0710f7f9792b37682a3cc45dd14282b71
Reviewed-on: https://skia-review.googlesource.com/140248
Commit-Queue: Timothy Liang <timliang@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/TestUtils.cpp b/tests/TestUtils.cpp
index 44a78c51fb..8b611c2064 100644
--- a/tests/TestUtils.cpp
+++ b/tests/TestUtils.cpp
@@ -113,3 +113,32 @@ void test_copy_to_surface(skiatest::Reporter* reporter, GrProxyProvider* proxyPr
         }
     }
 }
+
+void fill_pixel_data(int width, int height, GrColor* data) {
+    for (int j = 0; j < height; ++j) {
+        for (int i = 0; i < width; ++i) {
+            unsigned int red = (unsigned int)(256.f * (i / (float)width));
+            unsigned int green = (unsigned int)(256.f * (j / (float)height));
+            data[i + j * width] = GrColorPackRGBA(red - (red >> 8), green - (green >> 8),
+                                                  0xff, 0xff);
+        }
+    }
+}
+
+bool does_full_buffer_contain_correct_color(GrColor* srcBuffer,
+                                            GrColor* dstBuffer,
+                                            int width,
+                                            int height) {
+    GrColor* srcPtr = srcBuffer;
+    GrColor* dstPtr = dstBuffer;
+    for (int j = 0; j < height; ++j) {
+        for (int i = 0; i < width; ++i) {
+            if (srcPtr[i] != dstPtr[i]) {
+                return false;
+            }
+        }
+        srcPtr += width;
+        dstPtr += width;
+    }
+    return true;
+}