feat: change the default for PREFERRED_COLOR_SPACE to be null

Author: skyinu

library/src/main/java/com/bumptech/glide/load/PreferredColorSpace.java

@@ -29,8 +29,6 @@
  * Bitmap will actually use the requested color space.
  */
 public enum PreferredColorSpace {
-  /** don't set prefer ColorSpace. */
-  NULL,
   /** Prefers to decode images using {@link android.graphics.ColorSpace.Named#SRGB}. */
   SRGB,
   /** Prefers to decode images using {@link android.graphics.ColorSpace.Named#DISPLAY_P3}. */

library/src/main/java/com/bumptech/glide/load/resource/ImageDecoderResourceDecoder.java

@@ -129,17 +129,18 @@ public boolean onPartialImage(@NonNull DecodeException e) {
             }
 
             decoder.setTargetSize(resizeWidth, resizeHeight);
-
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
-              boolean isP3Eligible =
-                  preferredColorSpace == PreferredColorSpace.DISPLAY_P3
-                      && info.getColorSpace() != null
-                      && info.getColorSpace().isWideGamut();
-              decoder.setTargetColorSpace(
-                  ColorSpace.get(
-                      isP3Eligible ? ColorSpace.Named.DISPLAY_P3 : ColorSpace.Named.SRGB));
-            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-              decoder.setTargetColorSpace(ColorSpace.get(ColorSpace.Named.SRGB));
+            if (preferredColorSpace != null) {
+              if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+                boolean isP3Eligible =
+                    preferredColorSpace == PreferredColorSpace.DISPLAY_P3
+                        && info.getColorSpace() != null
+                        && info.getColorSpace().isWideGamut();
+                decoder.setTargetColorSpace(
+                    ColorSpace.get(
+                        isP3Eligible ? ColorSpace.Named.DISPLAY_P3 : ColorSpace.Named.SRGB));
+              } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                decoder.setTargetColorSpace(ColorSpace.get(ColorSpace.Named.SRGB));
+              }
             }
           }
         });

library/src/main/java/com/bumptech/glide/load/resource/bitmap/Downsampler.java

@@ -62,9 +62,7 @@ public final class Downsampler {
    * limitations.
    */
   public static final Option<PreferredColorSpace> PREFERRED_COLOR_SPACE =
-      Option.memory(
-          "com.bumptech.glide.load.resource.bitmap.Downsampler.PreferredColorSpace",
-          PreferredColorSpace.SRGB);
+      Option.memory("com.bumptech.glide.load.resource.bitmap.Downsampler.PreferredColorSpace");
   /**
    * Indicates the {@link com.bumptech.glide.load.resource.bitmap.DownsampleStrategy} option that
    * will be used to calculate the sample size to use to downsample an image given the original and
@@ -376,7 +374,7 @@ private Bitmap decodeFromWrappedStreams(
       }
     }
 
-    if (preferredColorSpace != PreferredColorSpace.NULL) {
+    if (preferredColorSpace != null) {
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
         boolean isP3Eligible =
             preferredColorSpace == PreferredColorSpace.DISPLAY_P3