[core][ios][android][macos] Use premultiplied image directly for RasterTile and ImageSource, un-premultiply in the shader for blending

1 files changed, 2 insertions, 3 deletions

diff --git a/src/mbgl/style/sources/image_source.cpp b/src/mbgl/style/sources/image_source.cpp
index 9313d8da4a..9b60ba1a48 100644
--- a/src/mbgl/style/sources/image_source.cpp
+++ b/src/mbgl/style/sources/image_source.cpp
@@ -37,7 +37,7 @@ void ImageSource::setURL(const std::string& url_) {
     }
 }
 
-void ImageSource::setImage(UnassociatedImage&& image_) {
+void ImageSource::setImage(PremultipliedImage&& image_) {
     url = {};
     if (req) {
         req.reset();
@@ -70,8 +70,7 @@ void ImageSource::loadDescription(FileSource& fileSource) {
             observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error("unexpectedly empty image url")));
         } else {
             try {
-                UnassociatedImage image = util::unpremultiply(decodeImage(*res.data));
-                baseImpl = makeMutable<Impl>(impl(), std::move(image));
+                baseImpl = makeMutable<Impl>(impl(), decodeImage(*res.data));
             } catch (...) {
                 observer->onSourceError(*this, std::current_exception());
             }