#223 support webp binary in multiple os at once (#225)

* support multiple platform

* add /webp_binaries/binary as primary search when loading webp binary

docs/webp.md

@@ -4,14 +4,18 @@
 
 Scrimage provides support for webp through the `scrimage-webp` module. To use webp, add this module to your build.
 
-This module uses the `dwebp` and `cwebp` binaries, created by Google. The `scrimage-webp` module comes with the linux_x64
-binaries already included (see
-required [copyright notice](https://github.com/sksamuel/scrimage/blob/master/scrimage-webp/src/main/resources/dist_webp_binaries/LICENSE))
-.
-
-If you don't wish to use the embedded binaries (eg, you need macos or windows binaries), then you
-can [download other versions](https://developers.google.com/speed/webp) and place them on your classpath
-at `/web_binaries/dwebp` or `/web_binaries/cwebp`.
+> animated gif to animated webp is not currently supported in this module.
+
+This module uses the `dwebp` and `cwebp` binaries, created by Google. The `scrimage-webp` module comes with the
+linux_x64, window_x64, mac-10.15 binaries already included (see required [copyright notice](https://github.com/sksamuel/scrimage/blob/master/scrimage-webp/src/main/resources/dist_webp_binaries/LICENSE)).
+
+If you don't wish to use the embedded binaries, then you can [download other versions](https://developers.google.com/speed/webp) and place them
+on your classpath at `/web_binaries/{osName}/dwebp` or `/web_binaries/{osName}/cwebp`.
+
+`{osName}` must be one of `window`, `linux`, `mac`. ie `/web_binaries/window/cwebp`.
+
+or just place your binaries into `/web_binaries/dwebp` or `/web_binaries/cwebp`.
+then scrimage will use `/web_binaries/{binary}` regardless of the binaries which is in os specific directory.
 
 Then you should be able to read webp files by using the `ImageLoader` as normal:
 

scrimage-webp/src/main/java/com/sksamuel/scrimage/webp/CWebpHandler.java

@@ -30,7 +30,7 @@ public class CWebpHandler extends WebpHandler {
     * https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html
     */
    private static void installCWebp() throws IOException {
-      installBinary(binary, "/webp_binaries/cwebp", "/dist_webp_binaries/cwebp");
+      installBinary(binary, getBinaryPath("cwebp"));
    }
 
    public byte[] convert(byte[] bytes,

scrimage-webp/src/main/java/com/sksamuel/scrimage/webp/DWebpHandler.java

@@ -29,7 +29,7 @@ public class DWebpHandler extends WebpHandler {
     * https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html
     */
    private static void installDWebp() throws IOException {
-      installBinary(binary, "/webp_binaries/dwebp", "/dist_webp_binaries/dwebp");
+      installBinary(binary, getBinaryPath("dwebp"));
    }
 
    public byte[] convert(byte[] bytes) throws IOException {

scrimage-webp/src/main/java/com/sksamuel/scrimage/webp/WebpHandler.java

@@ -32,6 +32,22 @@ protected static void installBinary(Path output, String... sources) throws IOExc
       throw new IOException("Could not locate webp binary at " + Arrays.toString(sources));
    }
 
+   protected static String[] getBinaryPath(String binaryName) {
+      String os = "linux";
+
+      if(SystemUtils.IS_OS_WINDOWS) {
+         os = "window";
+      } else if(SystemUtils.IS_OS_MAC) {
+         os = "mac";
+      }
+
+      return new String[] {
+         "/webp_binaries/"      + binaryName,
+         "/webp_binaries/"      + os + "/" + binaryName,
+         "/dist_webp_binaries/" + os + "/" + binaryName,
+      };
+   }
+
    private static boolean setExecutable(Path output) throws IOException {
       try {
          return new ProcessBuilder("chmod", "+x", output.toAbsolutePath().toString())

scrimage-webp/src/test/kotlin/com/sksamuel/scrimage/webp/WebpTest.kt

@@ -24,8 +24,10 @@ class WebpTest : FunSpec() {
       }
 
       test("dwebp should capture error on failure") {
+         val dwebpPath = WebpHandler.getBinaryPath("dwebp")[1]
+
          shouldThrow<IOException> {
-            ImmutableImage.loader().fromResource("/dist_webp_binaries/dwebp")
+            ImmutableImage.loader().fromResource(dwebpPath)
          }.message.shouldContain("BITSTREAM_ERROR")
       }
    }