[canvaskit] Make codec inclusion configurable

By default, we just ship with PNG encoding/decoding and
then decoding of JPEG, GIF, WEBP.

Change-Id: I19cbb3162acdbfde809df29d49050e3e7cb049db
Bug: skia:9733
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/277598
Reviewed-by: Nathaniel Nifong <nifong@google.com>

modules/canvaskit/CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  - `SkCanvas.saveLayer` can now be called with 1 argument (the paint). In this case the current
    effective clip will be used, as the current rect is assumed to be null.
  - `SkPaint.setAlphaf`
+ - Clients can supply `no_codecs` to compile.sh to remove all codec encoding and decoded code.
+   This can save over 100 kb compressed if codecs are not needed.
 
 ### Deprecated
  - `MakeSkDashPathEffect` will be renamed soon. Calls can be replaced with
@@ -27,11 +29,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  - Shadow offsets properly ignore the CTM in the canvas2d emulation layer.
 
 ### Changed
- - Stop compiling jpeg and webp encoders, for a smaller binary.
+ - Stop compiling jpeg and webp encoders by default. This results in a 100kb binary size reduction.
+   Clients that need these encoders can supply `force_encode_webp` or `force_encode_jpeg` to
+   compile.sh.
 
 ### Removed
- - Removed inverse filltypes
- - Removed StrokeAndFill paint style
+ - Removed inverse filltypes.
+ - Removed StrokeAndFill paint style.
  - Removed TextEncoding enum (it was only used internally). All functions assume UTF-8.
 
 ## [0.13.0] - 2020-02-28

modules/canvaskit/canvaskit_bindings.cpp

@@ -1681,9 +1681,11 @@ EMSCRIPTEN_BINDINGS(Skia) {
         .value("High",   SkFilterQuality::kHigh_SkFilterQuality);
 
     // Only used to control the encode function.
+    // TODO(kjlubick): compile these out when the appropriate encoder is disabled.
     enum_<SkEncodedImageFormat>("ImageFormat")
         .value("PNG",  SkEncodedImageFormat::kPNG)
-        .value("JPEG", SkEncodedImageFormat::kJPEG);
+        .value("JPEG",  SkEncodedImageFormat::kJPEG)
+        .value("WEBP",  SkEncodedImageFormat::kWEBP);
 
     enum_<SkPaint::Style>("PaintStyle")
         .value("Fill",            SkPaint::Style::kFill_Style)

modules/canvaskit/compile.sh

@@ -191,6 +191,31 @@ if [[ $@ == *no_paragraph* ]] || [[ $@ == *primitive_shaper* ]] || [[ $@ == *no_
   PARAGRAPH_BINDINGS=""
 fi
 
+DO_DECODE="true"
+if [[ $@ == *no_codecs* ]]; then
+  echo "Omitting codecs"
+  DO_DECODE="false"
+  ENCODE_PNG="false"
+  ENCODE_JPEG="false"
+  ENCODE_WEBP="false"
+else
+
+  ENCODE_PNG="true"
+  if [[ $@ == *no_encode_png* ]]; then
+    ENCODE_PNG="false"
+  fi
+
+  ENCODE_JPEG="false"
+  if [[ $@ == *force_encode_jpeg* ]]; then
+    ENCODE_JPEG="true"
+  fi
+
+  ENCODE_WEBP="false"
+  if [[ $@ == *force_encode_webp* ]]; then
+    ENCODE_WEBP="true"
+  fi
+
+fi # no_codecs
 
 # Turn off exiting while we check for ninja (which may not be on PATH)
 set +e
@@ -233,12 +258,12 @@ echo "Compiling bitcode"
   skia_use_fontconfig=false \
   skia_use_freetype=true \
   skia_use_libheif=false \
-  skia_use_libjpeg_turbo_decode=true \
-  skia_use_libjpeg_turbo_encode=false \
-  skia_use_libpng_decode=true \
-  skia_use_libpng_encode=true \
-  skia_use_libwebp_decode=true \
-  skia_use_libwebp_encode=false \
+  skia_use_libjpeg_turbo_decode=${DO_DECODE} \
+  skia_use_libjpeg_turbo_encode=${ENCODE_JPEG} \
+  skia_use_libpng_decode=${DO_DECODE} \
+  skia_use_libpng_encode=${ENCODE_PNG} \
+  skia_use_libwebp_decode=${DO_DECODE} \
+  skia_use_libwebp_encode=${ENCODE_WEBP} \
   skia_use_lua=false \
   skia_use_piex=false \
   skia_use_system_freetype2=false \