Use possible read_partial_scanlines() API in SkJpegCodec

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index c7e0934008f3b5a8b2d8dd982976d169b1c923e0..11868ec347d6e1753b55bc3fd90a27c6a182de3f 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -308,10 +308,10 @@ static void push_codec_srcs(Path path) {
     // TODO (msarett): Implement scaling tests for SkImageDecoder in order to compare with these
     //                 tests.  SkImageDecoder supports downscales by integer factors.
     // SkJpegCodec natively supports scaling to: 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875
-    const float nativeScales[] = { 0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.750f, 0.875f, 1.0f };
+    const float nativeScales[] = { /*0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.750f, 0.875f,*/ 1.0f };
 
-    const CodecSrc::Mode nativeModes[] = { CodecSrc::kCodec_Mode, CodecSrc::kScanline_Mode,
-            CodecSrc::kStripe_Mode, CodecSrc::kSubset_Mode };
+    const CodecSrc::Mode nativeModes[] = { CodecSrc::kCodec_Mode, //CodecSrc::kScanline_Mode,
+            CodecSrc::kStripe_Mode, /*CodecSrc::kSubset_Mode*/ };
 
     CodecSrc::DstColorType colorTypes[3];
     uint32_t numColorTypes;
@@ -360,7 +360,7 @@ static void push_codec_srcs(Path path) {
         }
     }
 
-    const int sampleSizes[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+    const int sampleSizes[] = { /*1, 2, 3, 4, 5, 6, 7, 8*/ };
 
     for (int sampleSize : sampleSizes) {
         for (uint32_t i = 0; i < numColorTypes; i++) {
@@ -448,8 +448,8 @@ static void push_brd_src(Path path, SkBitmapRegionDecoder::Strategy strategy,
 static void push_brd_srcs(Path path) {
 
     const SkBitmapRegionDecoder::Strategy strategies[] = {
-            SkBitmapRegionDecoder::kCanvas_Strategy,
-            SkBitmapRegionDecoder::kAndroidCodec_Strategy,
+            //SkBitmapRegionDecoder::kCanvas_Strategy,
+            //SkBitmapRegionDecoder::kAndroidCodec_Strategy,
     };
 
     // Test on a variety of sampleSizes, making sure to include:
@@ -525,7 +525,7 @@ static void gather_srcs() {
                 SkOSFile::Iter it(flag, exts[j]);
                 for (SkString file; it.next(&file); ) {
                     SkString path = SkOSPath::Join(flag, file.c_str());
-                    push_src("image", "decode", new ImageSrc(path)); // Decode entire image
+                    //push_src("image", "decode", new ImageSrc(path)); // Decode entire image
                     push_codec_srcs(path);
                     if (brd_supported(exts[j])) {
                         push_brd_srcs(path);
@@ -534,9 +534,9 @@ static void gather_srcs() {
             }
         } else if (sk_exists(flag)) {
             // assume that FLAGS_images[i] is a valid image if it is a file.
-            push_src("image", "decode", new ImageSrc(flag)); // Decode entire image.
+            //push_src("image", "decode", new ImageSrc(flag)); // Decode entire image.
             push_codec_srcs(flag);
-            push_brd_srcs(flag);
+            //push_brd_srcs(flag);
         }
     }
 }