Expose supercompression functions via JNI (KhronosGroup#879)

This builds upon KhronosGroup#876 ,
which is already merged.

It exposes the `deflateZstd` and `deflateZLIB` functions of the
`ktxTexture2` class to the Java `KtxTexture2` class.

Author: javagl

interface/java_binding/src/main/cpp/KtxTexture2.cpp

@@ -133,4 +133,16 @@ extern "C" JNIEXPORT jobject JNICALL Java_org_khronos_ktx_KtxTexture2_createFrom
     return make_ktx2_wrapper(env, instance);
 }
 
+extern "C" JNIEXPORT jint JNICALL Java_org_khronos_ktx_KtxTexture2_deflateZstd(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jint level)
+{
+  return ktxTexture2_DeflateZstd(get_ktx2_texture(env, thiz), static_cast<ktx_uint32_t>(level));
+}
 
+extern "C" JNIEXPORT jint JNICALL Java_org_khronos_ktx_KtxTexture2_deflateZLIB(JNIEnv *env,
+                                                                               jobject thiz,
+                                                                               jint level)
+{
+  return ktxTexture2_DeflateZLIB(get_ktx2_texture(env, thiz), static_cast<ktx_uint32_t>(level));
+}

interface/java_binding/src/main/java/org/khronos/ktx/KtxTexture2.java

@@ -45,4 +45,30 @@ public static native KtxTexture2 createFromNamedFile(String filename,
     public static KtxTexture2 createFromNamedFile(String filename) {
         return createFromNamedFile(filename, KtxTextureCreateFlagBits.LOAD_IMAGE_DATA_BIT);
     }
+
+    /**
+     * Deflate the data in a {@link KtxTexture2} object using Zstandard.
+     *
+     * The texture's levelIndex, dataSize, DFD, data pointer, and supercompressionScheme will
+     * all be updated after successful deflation to reflect the deflated data.
+     *
+     * @param level Set speed vs compression ratio trade-off. Values
+     * between 1 and 22 are accepted. The lower the level the faster. Values
+     * above 20 should be used with caution as they require more memory.
+     * @return A {@link KtxErrorCode} value
+     */
+    public native int deflateZstd(int level);
+
+    /**
+     * Deflate the data in a {@link KtxTexture2} object using miniz (ZLIB)
+     *
+     * The texture's levelIndex, dataSize, DFD, data pointer, and supercompressionScheme will
+     * all be updated after successful deflation to reflect the deflated data.
+     *
+     * @param level Set speed vs compression ratio trade-off. Values
+     * between 1 and 9 are accepted. The lower the level the faster.
+     * @return A {@link KtxErrorCode} value
+     */
+    public native int deflateZLIB(int level);
+
 }

lib/texture2.c

@@ -2471,7 +2471,7 @@ ktx_uint64_t ktxTexture2_levelDataOffset(ktxTexture2* This, ktx_uint32_t level)
  * @~English
  * @brief Inflate the data in a ktxTexture2 object using Zstandard.
  *
- * The texture's levelIndex, dataSize, DFD  and supercompressionScheme will
+ * The texture's levelIndex, dataSize, DFD, data pointer, and supercompressionScheme will
  * all be updated after successful inflation to reflect the inflated data.
  *
  * @param[in] This                    pointer to the ktxTexture2 object of interest.
@@ -2583,7 +2583,7 @@ ktxTexture2_inflateZstdInt(ktxTexture2* This, ktx_uint8_t* pDeflatedData,
  * @~English
  * @brief Inflate the data in a ktxTexture2 object using miniz (ZLIB).
  *
- * The texture's levelIndex, dataSize, DFD and supercompressionScheme will
+ * The texture's levelIndex, dataSize, DFD, data pointer, and supercompressionScheme will
  * all be updated after successful inflation to reflect the inflated data.
  *
  * @param[in] This              pointer to the ktxTexture2 object of interest.

lib/writer2.c

@@ -761,7 +761,7 @@ ktxTexture2_WriteToMemory(ktxTexture2* This,
  * @~English
  * @brief Deflate the data in a ktxTexture2 object using Zstandard.
  *
- * The texture's levelIndex, dataSize, DFD  and supercompressionScheme will
+ * The texture's levelIndex, dataSize, DFD, data pointer, and supercompressionScheme will
  * all be updated after successful deflation to reflect the deflated data.
  *
  * @param[in] This pointer to the ktxTexture2 object of interest.
@@ -890,7 +890,7 @@ ktxTexture2_DeflateZstd(ktxTexture2* This, ktx_uint32_t compressionLevel)
  * @~English
  * @brief Deflate the data in a ktxTexture2 object using miniz (ZLIB).
  *
- * The texture's levelIndex, dataSize, DFD and supercompressionScheme will
+ * The texture's levelIndex, dataSize, DFD, data pointer, and supercompressionScheme will
  * all be updated after successful deflation to reflect the deflated data.
  *
  * @param[in] This pointer to the ktxTexture2 object of interest.