Skia side RGB to YUV gpu conversion

tests/JpegTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkData.h"
+#include "SkDecodingImageGenerator.h"
 #include "SkForceLinking.h"
+#include "SkFrontBufferedStream.h"
 #include "SkImage.h"
 #include "SkImageDecoder.h"
+#include "SkPixelRef.h"
 #include "SkStream.h"
 #include "Test.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
 #define JPEG_TEST_WRITE_TO_FILE_FOR_DEBUGGING 0  // do not do this for
                                                  // normal unit testing.
 static unsigned char goodJpegImage[] = {
 0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46,
 0x49, 0x46, 0x00, 0x01, 0x01, 0x01, 0x00, 0x8F,
@@ skipping 422 matching lines @@
     REPORTER_ASSERT(reporter, bm8888.getColor(127, 127) == SK_ColorWHITE);
 #endif
 
     #if JPEG_TEST_WRITE_TO_FILE_FOR_DEBUGGING
     // Check to see that the resulting bitmap is nice
     bool writeSuccess = (!(bm8888.empty())) && SkImageEncoder::EncodeFile(
         "HalfOfAJpeg.png", bm8888, SkImageEncoder::kPNG_Type, 100);
     SkASSERT(writeSuccess);
     #endif
 }
+
+DEF_TEST(Jpeg_YUV, reporter) {
+    size_t len = sizeof(goodJpegImage);
+    SkMemoryStream memStream(goodJpegImage, len);
+
+    SkAutoTUnref<SkStreamRewindable> stream(SkFrontBufferedStream::Create(&memStream, len));

[scroggo, 2014/07/18 21:52:41]

Why do you need an SkFrontBufferedStream? An SkMemoryStream is already
rewindable.

+    SkBitmap bitmap;
+    SkDecodingImageGenerator::Options opts;
+    bool pixelsInstalled = SkInstallDiscardablePixelRef(
+                SkDecodingImageGenerator::Create(stream.detach(), opts), &bitmap);
+    REPORTER_ASSERT(reporter, pixelsInstalled);
+
+    if (pixelsInstalled) {

[scroggo, 2014/07/18 21:52:41]

nit: It may be a matter of personal opinion, but you can save the indentation by
reversing your if statements:

if (!pixelsInstalled) {
  return;
}
...

if (!sizesComputed) {
  return;
}

+        SkPixelRef* pixelRef = bitmap.pixelRef();
+        SkISize yuvSizes[3];
+        bool sizesComputed = (NULL != pixelRef) && pixelRef->getYUV8Planes(yuvSizes, NULL, NULL);
+        REPORTER_ASSERT(reporter, sizesComputed);
+
+        if (sizesComputed) {
+            // Allocate the memory for YUV
+            size_t totalSize(0);
+            size_t sizes[3], rowBytes[3];
+            const int32_t expected_sizes[] = {128, 64, 64};
+            for (int i = 0; i < 3; ++i) {
+                rowBytes[i] = yuvSizes[i].fWidth;
+                totalSize  += sizes[i] = rowBytes[i] * yuvSizes[i].fHeight;
+                REPORTER_ASSERT(reporter, rowBytes[i]         == (size_t)expected_sizes[i]);
+                REPORTER_ASSERT(reporter, yuvSizes[i].fWidth  == expected_sizes[i]);
+                REPORTER_ASSERT(reporter, yuvSizes[i].fHeight == expected_sizes[i]);
+            }
+            SkAutoMalloc storage(totalSize);
+            void* planes[3];
+            planes[0] = storage.get();
+            planes[1] = (uint8_t*)planes[0] + sizes[0];
+            planes[2] = (uint8_t*)planes[1] + sizes[1];
+
+            // Get the YUV planes
+            REPORTER_ASSERT(reporter, pixelRef->getYUV8Planes(yuvSizes, planes, rowBytes));
+        }
+    }
+}