Implement AImageDecoder_computeSampledSize

Bug: 135133301
Test: If9ed79d8dcf1169369ba454723f4ac8d26427b7b
Change-Id: I4926188cf66e2693c09dd7f1197173441936080c

2 files changed, 17 insertions, 0 deletions

diff --git a/native/graphics/jni/imagedecoder.cpp b/native/graphics/jni/imagedecoder.cpp
index 51439672d404..bd5914a55042 100644
--- a/native/graphics/jni/imagedecoder.cpp
+++ b/native/graphics/jni/imagedecoder.cpp
@@ -131,6 +131,10 @@ static ImageDecoder* toDecoder(AImageDecoder* d) {
     return reinterpret_cast<ImageDecoder*>(d);
 }
 
+static const ImageDecoder* toDecoder(const AImageDecoder* d) {
+    return reinterpret_cast<const ImageDecoder*>(d);
+}
+
 // Note: This differs from the version in android_bitmap.cpp in that this
 // version returns kGray_8_SkColorType for ANDROID_BITMAP_FORMAT_A_8. SkCodec
 // allows decoding single channel images to gray, which Android then treats
@@ -258,6 +262,18 @@ int AImageDecoder_setTargetSize(AImageDecoder* decoder, int width, int height) {
             ? ANDROID_IMAGE_DECODER_SUCCESS : ANDROID_IMAGE_DECODER_INVALID_SCALE;
 }
 
+int AImageDecoder_computeSampledSize(const AImageDecoder* decoder, int sampleSize,
+                                     int* width, int* height) {
+    if (!decoder || !width || !height || sampleSize < 1) {
+        return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
+    }
+
+    SkISize size = toDecoder(decoder)->mCodec->getSampledDimensions(sampleSize);
+    *width = size.width();
+    *height = size.height();
+    return ANDROID_IMAGE_DECODER_SUCCESS;
+}
+
 int AImageDecoder_setCrop(AImageDecoder* decoder, ARect crop) {
     if (!decoder) {
         return ANDROID_IMAGE_DECODER_BAD_PARAMETER;
diff --git a/native/graphics/jni/libjnigraphics.map.txt b/native/graphics/jni/libjnigraphics.map.txt
index 6843e7a8552f..d9e7828d852a 100644
--- a/native/graphics/jni/libjnigraphics.map.txt
+++ b/native/graphics/jni/libjnigraphics.map.txt
@@ -10,6 +10,7 @@ LIBJNIGRAPHICS {
     AImageDecoder_getMinimumStride; # introduced=30
     AImageDecoder_decodeImage; # introduced=30
     AImageDecoder_setTargetSize; # introduced=30
+    AImageDecoder_computeSampledSize; # introduced=30
     AImageDecoder_setCrop; # introduced=30
     AImageDecoderHeaderInfo_getWidth; # introduced=30
     AImageDecoderHeaderInfo_getHeight; # introduced=30